IRtcEngine

The basic interface of the Agora SDK that implements the core functions of real-time communication.

IRtcEngine provides the main methods that your app can call.

Before calling other APIs, you must call createAgoraRtcEngine to create an IRtcEngine object.

addListener

Adds one IRtcEngineEvent listener.

addListener?<EventType extends keyof IRtcEngineEvent>(
      eventType: EventType,
      listener: IRtcEngineEvent[EventType]
    ): void;

Details

After calling this method, you can listen for the corresponding events in the IRtcEngine object and obtain data through IRtcEngineEvent. Depending on your project needs, you can add multiple listeners for the same event.

Parameters

eventType
The name of the target event to listen for. See IRtcEngineEvent.
listener
The callback function for eventType. Take adding a listener for onJoinChannelSuccess as an example:
const onJoinChannelSuccess = (connection: RtcConnection, elapsed: number) => {};
engine.addListener('onJoinChannelSuccess', onJoinChannelSuccess);

addVideoWatermark

Adds a watermark image to the local video.

abstract addVideoWatermark(
    watermarkUrl: string,
    options: WatermarkOptions
  ): number;

Details

This method adds a PNG watermark image to the local video in the live streaming. Once the watermark image is added, all the audience in the channel (CDN audience included), and the capturing device can see and capture it. The Agora SDK supports adding only one watermark image onto a local video or CDN live stream. The newly added watermark image replaces the previous one.

The watermark coordinates are dependent on the settings in the setVideoEncoderConfiguration method:
  • If the orientation mode of the encoding video (OrientationMode) is fixed landscape mode or the adaptive landscape mode, the watermark uses the landscape orientation.
  • If the orientation mode of the encoding video (OrientationMode) is fixed portrait mode or the adaptive portrait mode, the watermark uses the portrait orientation.
  • When setting the watermark position, the region must be less than the dimensions set in the setVideoEncoderConfiguration method; otherwise, the watermark image will be cropped.
Attention:
  • Ensure that calling this method after enableVideo.
  • If you only want to add a watermark to the media push, you can call this method or the startRtmpStreamWithTranscoding method.
  • This method supports adding a watermark image in the PNG file format only. Supported pixel formats of the PNG image are RGBA, RGB, Palette, Gray, and Alpha_gray.
  • If the dimensions of the PNG image differ from your settings in this method, the image will be cropped or zoomed to conform to your settings.
  • If you have enabled the mirror mode for the local video, the watermark on the local video is also mirrored. To avoid mirroring the watermark, Agora recommends that you do not use the mirror and watermark functions for the local video at the same time. You can implement the watermark function in your application layer.

Parameters

watermarkUrl
The local file path of the watermark image to be added. This method supports adding a watermark image from the local absolute or relative file path.
options
The options of the watermark image to be added. See WatermarkOptions.

Returns

  • 0: Success.
  • < 0: Failure.

adjustAudioMixingPlayoutVolume

Adjusts the volume of audio mixing for local playback.

abstract adjustAudioMixingPlayoutVolume(volume: number): number;

Call timing

You need to call this method after calling startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Restrictions

None.

Parameters

volume
The volume of audio mixing for local playback. The value ranges between 0 and 100 (default). 100 represents the original volume.

Returns

  • 0: Success.
  • < 0: Failure.

adjustAudioMixingPublishVolume

Adjusts the volume of audio mixing for publishing.

abstract adjustAudioMixingPublishVolume(volume: number): number;

This method adjusts the volume of audio mixing for publishing (sending to other users).

Call timing

Call this method after calling startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Restrictions

None.

Parameters

volume
The volume of audio mixing for local playback. The value ranges between 0 and 100 (default). 100 represents the original volume.

Returns

  • 0: Success.
  • < 0: Failure.

adjustAudioMixingVolume

Adjusts the volume during audio mixing.

abstract adjustAudioMixingVolume(volume: number): number;

This method adjusts the audio mixing volume on both the local client and remote clients.

Note: This method does not affect the volume of the audio file set in the playEffect method.

Call timing

Call this method after startAudioMixing.

Restrictions

None.

Parameters

volume
Audio mixing volume. The value ranges between 0 and 100. The default value is 100, which means the original volume.

Returns

  • 0: Success.
  • < 0: Failure.

adjustCustomAudioPlayoutVolume

Adjusts the volume of the custom audio track played locally.

abstract adjustCustomAudioPlayoutVolume(
    trackId: number,
    volume: number
  ): number;

Details

Attention: Ensure you have called the createCustomAudioTrack method to create a custom audio track before calling this method.

If you want to change the volume of the audio to be played locally, you need to call this method again.

Parameters

trackId
The audio track ID. Set this parameter to the custom audio track ID returned in createCustomAudioTrack.
volume
The volume of the audio source. The value can range from 0 to 100. 0 means mute; 100 means the original volume.

Returns

  • 0: Success.
  • < 0: Failure.

adjustCustomAudioPublishVolume

Adjusts the volume of the custom audio track played remotely.

abstract adjustCustomAudioPublishVolume(
    trackId: number,
    volume: number
  ): number;

Details

Attention: Ensure you have called the createCustomAudioTrack method to create a custom audio track before calling this method.

If you want to change the volume of the audio played remotely, you need to call this method again.

Parameters

trackId
The audio track ID. Set this parameter to the custom audio track ID returned in createCustomAudioTrack.
volume
The volume of the audio source. The value can range from 0 to 100. 0 means mute; 100 means the original volume.

Returns

  • 0: Success.
  • < 0: Failure.

adjustPlaybackSignalVolume

Adjusts the playback signal volume of all remote users.

abstract adjustPlaybackSignalVolume(volume: number): number;

This method is used to adjust the signal volume of all remote users mixed and played locally. If you need to adjust the signal volume of a specified remote user played locally, it is recommended that you call adjustUserPlaybackSignalVolume instead.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

volume
The volume of the user. The value range is [0,400].
  • 0: Mute.
  • 100: (Default) The original volume.
  • 400: Four times the original volume (amplifying the audio signals by four times).

Returns

  • 0: Success.
  • < 0: Failure.

adjustRecordingSignalVolume

Adjusts the capturing signal volume.

abstract adjustRecordingSignalVolume(volume: number): number;

If you only need to mute the audio signal, Agora recommends that you use muteRecordingSignal instead.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

volume
The volume of the user. The value range is [0,400].
  • 0: Mute.
  • 100: (Default) The original volume.
  • 400: Four times the original volume (amplifying the audio signals by four times).

Returns

  • 0: Success.
  • < 0: Failure.

adjustUserPlaybackSignalVolume

Adjusts the playback signal volume of a specified remote user.

abstract adjustUserPlaybackSignalVolume(uid: number, volume: number): number;

You can call this method to adjust the playback volume of a specified remote user. To adjust the playback volume of different remote users, call the method as many times, once for each remote user.

Call timing

Call this method after joining a channel.

Restrictions

None.

Parameters

uid
The user ID of the remote user.
volume
The volume of the user. The value range is [0,400].
  • 0: Mute.
  • 100: (Default) The original volume.
  • 400: Four times the original volume (amplifying the audio signals by four times).

Returns

  • 0: Success.
  • < 0: Failure.

clearVideoWatermarks

Removes the watermark image from the video stream.

abstract clearVideoWatermarks(): number;

Returns

  • 0: Success.
  • < 0: Failure.

complain

Allows a user to complain about the call quality after a call ends.

abstract complain(callId: string, description: string): number;

Details

This method allows users to complain about the quality of the call. Call this method after the user leaves the channel.

Parameters

callId
The current call ID. You can get the call ID by calling getCallId.
description
A description of the call. The string length should be less than 800 bytes.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).
    • -2: The parameter is invalid.
    • -7: The method is called before IRtcEngine is initialized.

createAgoraRtcEngine

Creates one IRtcEngine object.

export function createAgoraRtcEngine(): IRtcEngine {
  return instance;
}

Details

Currently, the Agora RTC SDK v4.x supports creating only one IRtcEngine object for each app.

Returns

One IRtcEngine object.

createDataStream

Creates a data stream.

abstract createDataStream(config: DataStreamConfig): number;

Call timing

You can call this method either before or after joining a channel.

Restrictions

Each user can create up to five data streams during the lifecycle of IRtcEngine. The data stream will be destroyed when leaving the channel, and the data stream needs to be recreated if needed.

Parameters

config
The configurations for the data stream. See DataStreamConfig.

Returns

  • ID of the created data stream, if the method call succeeds.
  • < 0: Failure.

createMediaPlayer

Creates a media player object.

abstract createMediaPlayer(): IMediaPlayer;

Before calling any APIs in the IMediaPlayer class, you need to call this method to create an instance of the media player. If you need to create multiple instances, you can call this method multiple times.

Call timing

You can call this method either before or after joining a channel.

Restrictions

None.

Returns

  • An IMediaPlayer object, if the method call succeeds.
  • An empty pointer, if the method call fails.

createCustomVideoTrack

Creates a custom video track.

abstract createCustomVideoTrack(): number;

Details

To publish a custom video source, see the following steps:
  1. Call this method to create a video track and get the video track ID.
  2. Call joinChannel to join the channel. In ChannelMediaOptions, set customVideoTrackId to the video track ID that you want to publish, and set publishCustomVideoTrack to true.
  3. Call pushVideoFrame and specify videoTrackId as the video track ID set in step 2. You can then publish the corresponding custom video source in the channel.

Returns

  • If the method call is successful, the video track ID is returned as the unique identifier of the video track.
  • If the method call fails, 0xffffffff is returned.

configRhythmPlayer

Configures the virtual metronome.

abstract configRhythmPlayer(config: AgoraRhythmPlayerConfig): number;
  • After calling startRhythmPlayer, you can call this method to reconfigure the virtual metronome.
  • After enabling the virtual metronome, the SDK plays the specified audio effect file from the beginning, and controls the playback duration of each file according to beatsPerMinute you set in AgoraRhythmPlayerConfig. For example, if you set beatsPerMinute as 60, the SDK plays one beat every second. If the file duration exceeds the beat duration, the SDK only plays the audio within the beat duration.
  • By default, the sound of the virtual metronome is published in the channel. If you want the sound to be heard by the remote users, you can set publishRhythmPlayerTrack in ChannelMediaOptions as true.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

config
The metronome configuration. See AgoraRhythmPlayerConfig.

Returns

  • 0: Success.
  • < 0: Failure.

destroyCustomVideoTrack

Destroys the specified video track.

abstract destroyCustomVideoTrack(videoTrackId: number): number;

Parameters

videoTrackId
The video track ID returned by calling the createCustomVideoTrack method.

Returns

  • 0: Success.
  • < 0: Failure.

destroyMediaPlayer

Destroys the media player instance.

abstract destroyMediaPlayer(mediaPlayer: IMediaPlayer): number;

Parameters

mediaPlayer

One IMediaPlayer object.

Returns

  • ≥ 0: Success. Returns the ID of media player instance.
  • < 0: Failure.

disableAudio

Disables the audio module.

abstract disableAudio(): number;

The audio module is enabled by default, and you can call this method to disable the audio module.

Call timing

This method can be called either before or after joining the channel. It is still valid after one leaves channel.

Restrictions

This method resets the internal engine and takes some time to take effect. Agora recommends using the following API methods to control the audio modules separately:

Returns

  • 0: Success.
  • < 0: Failure.

disableAudioSpectrumMonitor

Disables audio spectrum monitoring.

abstract disableAudioSpectrumMonitor(): number;

Details

After calling enableAudioSpectrumMonitor, if you want to disable audio spectrum monitoring, you can call this method.

Attention:

You can call this method either before or after joining a channel.

Returns

  • 0: Success.
  • < 0: Failure.

disableVideo

Disables the video module.

abstract disableVideo(): number;

This method is used to disable the video module.

Call timing

This method can be called either before or after joining the channel.
  • If it is called before joining the channel, the audio-only mode is enabled.
  • If it is called after joining the channel, it switches from video mode to audio-only mode. Then, calling enableVideo can swithch to video mode again.

Restrictions

  • This method affects the internal engine and can be called after leaving the channel.
  • Calling this method will reset the entire engine, resulting in a slow response time. You can use the following methods to independently control a specific function of the video module based on your actual needs:

Returns

  • 0: Success.
  • < 0: Failure.

enableAudio

Enables the audio module.

abstract enableAudio(): number;

The audio module is enabled by default After calling disableAudio to disable the audio module, you can call this method to re-enable it.

Call timing

This method can be called either before or after joining the channel. It is still valid after one leaves channel.

Restrictions

  • Calling this method will reset the entire engine, resulting in a slow response time. You can use the following methods to independently control a specific function of the audio module based on your actual needs:
  • A successful call of this method resets enableLocalAudio, muteRemoteAudioStream, and muteAllRemoteAudioStreams. Proceed it with caution.

Returns

  • 0: Success.
  • < 0: Failure.

enableAudioSpectrumMonitor

Turns on audio spectrum monitoring.

abstract enableAudioSpectrumMonitor(intervalInMS?: number): number;

Details

If you want to obtain the audio spectrum data of local or remote users, you can register the audio spectrum observer and enable audio spectrum monitoring.

Attention:

You can call this method either before or after joining a channel.

Parameters

intervalInMS

The interval (in milliseconds) at which the SDK triggers the onLocalAudioSpectrum and onRemoteAudioSpectrum callbacks. The default value is 100. Do not set this parameter to a value less than 10, otherwise calling this method would fail.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: Invalid parameters.

enableAudioVolumeIndication

Enables the reporting of users' volume indication.

abstract enableAudioVolumeIndication(
    interval: number,
    smooth: number,
    reportVad: boolean
  ): number;

This method enables the SDK to regularly report the volume information to the app of the local user who sends a stream and remote users (three users at most) whose instantaneous volumes are the highest.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

interval
Sets the time interval between two consecutive volume indications:
  • ≤ 0: Disables the volume indication.
  • > 0: Time interval (ms) between two consecutive volume indications. Ensure this parameter is set to a value greater than 10, otherwise you will not receive the onAudioVolumeIndication callback. Agora recommends that this value is set as greater than 100.
smooth
The smoothing factor that sets the sensitivity of the audio volume indicator. The value ranges between 0 and 10. The recommended value is 3. The greater the value, the more sensitive the indicator.
reportVad
  • true: Enables the voice activity detection of the local user. Once it is enabled, the vad parameter of the onAudioVolumeIndication callback reports the voice activity status of the local user.
  • false: (Default) Disables the voice activity detection of the local user. Once it is disabled, the vad parameter of the onAudioVolumeIndication callback does not report the voice activity status of the local user, except for the scenario where the engine automatically detects the voice activity of the local user.

Returns

  • 0: Success.
  • < 0: Failure.

enableCameraCenterStage

Enables or disables portrait center stage.

abstract enableCameraCenterStage(enabled: boolean): number;

The portrait center stage feature is off by default. You need to call this method to turn it on. If you need to disable this feature, you need to call this method again and set enabled to false.

Attention: This method applies to iOS only.

Applicable scenarios

The portrait center stage feature can be widely used in scenarios such as online meetings, shows, online education, etc. The host can use this feature to ensure that they are always in the center of the screen, whether they move or not, in order to achieve a good display effect.

Call timing

This method must be called after the camera is successfully enabled, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).

Restrictions

Due to the high performance requirements of this feature, you need to use it on the following types of devices or devices with higher performance:
  • iPad:
    • 12.9-inch iPad Pro (5th generation)
    • 11-inch iPad Pro (3rd generation)
    • iPad (9th generation)
    • iPad mini (6th generation)
    • iPad Air (5th generation)
  • 2020 M1 MacBook Pro 13-inch + iPhone 11 (using iPhone as external camera for the MacBook)

Agora recommends that you call isCameraCenterStageSupported to check whether the current device supports portrait center stage before enabling this feature.

Parameters

enabled
Whether to enable the portrait center stage:
  • true: Enable portrait center stage.
  • false: Disable portrait center stage.

Returns

  • 0: Success.
  • < 0: Failure.

enableContentInspect

Enables or disables video screenshot and upload.

abstract enableContentInspect(
    enabled: boolean,
    config: ContentInspectConfig
  ): number;

When video screenshot and upload function is enabled, the SDK takes screenshots and uploads videos sent by local users based on the type and frequency of the module you set in ContentInspectConfig. After video screenshot and upload, the Agora server sends the callback notification to your app server in HTTPS requests and sends all screenshots to the third-party cloud storage service.

Call timing

This method can be called either before or after joining the channel.

Restrictions

Before calling this method, ensure that you have contacted technical support to activate the video screenshot upload service.

Parameters

enabled
Whether to enalbe video screenshot and upload:
  • true: Enables video screenshot and upload.
  • false: Disables video screenshot and upload.
config
Screenshot and upload configuration. See ContentInspectConfig.
Note: When the video moderation module is set to video moderation via Agora self-developed extension(ContentInspectSupervision), the video screenshot and upload dynamic library libagora_content_inspect_extension.dll is required. Deleting this library disables the screenshot and upload feature.

Returns

  • 0: Success.
  • < 0: Failure.

enableCustomAudioLocalPlayback

Sets whether to enable the local playback of external audio source.

abstract enableCustomAudioLocalPlayback(
    trackId: number,
    enabled: boolean
  ): number;

Details

Attention: Ensure you have called the createCustomAudioTrack method to create a custom audio track before calling this method.

After calling this method to enable the local playback of external audio source, if you need to stop local playback, you can call this method again and set enabled to false.

You can call adjustCustomAudioPlayoutVolume to adjust the local playback volume of the custom audio track.

Parameters

trackId
The audio track ID. Set this parameter to the custom audio track ID returned in createCustomAudioTrack.
enabled
Whether to play the external audio source:
  • true: Play the external audio source.
  • false: (Default) Do not play the external source.

Returns

  • 0: Success.
  • < 0: Failure.

enableDualStreamMode

Sets the dual-stream mode on the sender side and the low-quality video stream.

abstract enableDualStreamMode(
    enabled: boolean,
    streamConfig?: SimulcastStreamConfig
  ): number;

Details

Deprecated:
This method is deprecated as of v4.2.0. Use setDualStreamMode instead.
You can call this method to enable or disable the dual-stream mode on the publisher side. Dual streams are a pairing of a high-quality video stream and a low-quality video stream:
  • High-quality video stream: High bitrate, high resolution.
  • Low-quality video stream: Low bitrate, low resolution.

After you enable dual-stream mode, you can call setRemoteVideoStreamType to choose to receive either the high-quality video stream or the low-quality video stream on the subscriber side.

Note:
  • This method is applicable to all types of streams from the sender, including but not limited to video streams collected from cameras, screen sharing streams, and custom-collected video streams.
  • If you need to enable dual video streams in a multi-channel scenario, you can call the enableDualStreamModeEx method.
  • You can call this method either before or after joining a channel.

Parameters

enabled
Whether to enable dual-stream mode:
  • true: Enable dual-stream mode.
  • false: (Default) Disable dual-stream mode.
streamConfig
The configuration of the low-quality video stream. See SimulcastStreamConfig.
Note: When setting mode to DisableSimulcastStream, setting streamConfig will not take effect.

Returns

  • 0: Success.
  • < 0: Failure.

enableEncryption

Enables or disables the built-in encryption.

abstract enableEncryption(enabled: boolean, config: EncryptionConfig): number;

After the user leaves the channel, the SDK automatically disables the built-in encryption. To enable the built-in encryption, call this method before the user joins the channel again.

Applicable scenarios

Scenarios with higher security requirements.

Call timing

Call this method before joining a channel.

Restrictions

  • All users within the same channel must set the same encryption configurations when calling this method.
  • If you enable the built-in encryption, you cannot use the Media Push function.

Parameters

enabled
Whether to enable built-in encryption:
  • true: Enable the built-in encryption.
  • false: (Default) Disable the built-in encryption.
config
Built-in encryption configurations. See EncryptionConfig.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: An invalid parameter is used. Set the parameter with a valid value.
    • -4: The built-in encryption mode is incorrect or the SDK fails to load the external encryption library. Check the enumeration or reload the external encryption library.
    • -7: The SDK is not initialized. Initialize the IRtcEngine instance before calling this method.

enableExtension

Enables or disables extensions.

abstract enableExtension(
    provider: string,
    extension: string,
    enable?: boolean,
    type?: MediaSourceType
  ): number;

Call timing

Agora recommends that you call this method after joining a channel.

Restrictions

  • If you want to enable multiple extensions, you need to call this method multiple times.
  • After a successful call of this method, you cannot load other extensions.

Parameters

provider
The name of the extension provider.
extension
The name of the extension.
enable
Whether to enable the extension:
  • true: Enable the extension.
  • false: Disable the extension.
type
Source type of the extension. See MediaSourceType.

Returns

  • 0: Success.
  • < 0: Failure.
    • -3: The extension library is not loaded. Agora recommends that you check the storage location or the name of the dynamic library.

enableFaceDetection

Enables or disables face detection for the local user.

abstract enableFaceDetection(enabled: boolean): number;

Call timing

This method needs to be called after the camera is started (for example, by calling startPreview or enableVideo).

Restrictions

None.

Parameters

enabled
Whether to enable face detection for the local user:
  • true: Enable face detection.
  • false: (Default) Disable face detection.

Returns

  • 0: Success.
  • < 0: Failure.

enableInEarMonitoring

Enables in-ear monitoring.

abstract enableInEarMonitoring(
    enabled: boolean,
    includeAudioFilters: EarMonitoringFilterType
  ): number;

This method enables or disables in-ear monitoring.

Call timing

This method can be called either before or after joining the channel.

Restrictions

Users must use earphones (wired or Bluetooth) to hear the in-ear monitoring effect.

Parameters

enabled
Enables or disables in-ear monitoring.
  • true: Enables in-ear monitoring.
  • false: (Default) Disables in-ear monitoring.
includeAudioFilters
The audio filter types of in-ear monitoring. See EarMonitoringFilterType.

Returns

  • 0: Success.
  • < 0: Failure.
    • - 8: Make sure the current audio routing is Bluetooth or headset.

enableInstantMediaRendering

Enables audio and video frame instant rendering.

abstract enableInstantMediaRendering(): number;

After successfully calling this method, the SDK enables the instant frame rendering mode, which can speed up the first frame rendering after the user joins the channel.

Applicable scenarios

Agora recommends that you enable this mode for the audience in a live streaming scenario.

Call timing

Agora recommends that you call this method before joining a channel.

Restrictions

Once the method is successfully called, you can only cancel instant rendering by calling release to destroy the IRtcEngine object.

Returns

  • 0: Success.
  • < 0: Failure.
    • -7: The method is called before IRtcEngine is initialized.

enableLocalAudio

Enables or disables the local audio capture.

abstract enableLocalAudio(enabled: boolean): number;

The audio function is enabled by default when users joining a channel. This method disables or re-enables the local audio function to stop or restart local audio capturing.

The difference between this method and muteLocalAudioStream are as follows:
  • enableLocalAudio: Disables or re-enables the local audio capturing and processing. If you disable or re-enable local audio capturing using the enableLocalAudio method, the local user might hear a pause in the remote audio playback.
  • muteLocalAudioStream: Sends or stops sending the local audio streams without affecting the audio capture status.

Applicable scenarios

This method does not affect receiving the remote audio streams, and enableLocalAudio(false) is applicable to scenarios where the user wants to receive remote audio streams without sending any audio stream to other users in the channel.

Call timing

You can call this method either before or after joining a channel. Calling it before joining a channel only sets the device state, and it takes effect immediately after you join the channel.

Restrictions

None.

Parameters

enabled
  • true: (Default) Re-enable the local audio function, that is, to start the local audio capturing device (for example, the microphone).
  • false: Disable the local audio function, that is, to stop local audio capturing.

Returns

  • 0: Success.
  • < 0: Failure.

enableLocalVideo

Enables/Disables the local video capture.

abstract enableLocalVideo(enabled: boolean): number;

Details

This method disables or re-enables the local video capture, and does not affect receiving the remote video stream.

After calling enableVideo, the local video capture is enabled by default.

If you call enableLocalVideo(false) to disable local video capture within the channel, it also simultaneously stops publishing the video stream within the channel. If you want to restart video catpure, you can call enableLocalVideo(true) and then call updateChannelMediaOptions to set the options parameter to publish the locally captured video stream in the channel.

After the local video capturer is successfully disabled or re-enabled, the SDK triggers the onRemoteVideoStateChanged callback on the remote client.

Attention:
  • You can call this method either before or after joining a channel.
  • This method enables the internal engine and is valid after leaving the channel.

Parameters

enabled

Whether to enable the local video capture.

  • true: (Default) Enable the local video capture.
  • false: Disable the local video capture. Once the local video is disabled, the remote users cannot receive the video stream of the local user, while the local user can still receive the video streams of remote users. When set to false, this method does not require a local camera.

Returns

  • 0: Success.
  • < 0: Failure.

enableMultiCamera

Enables or disables multi-camera capture.

abstract enableMultiCamera(
    enabled: boolean,
    config: CameraCapturerConfiguration
  ): number;

Details

In scenarios where there are existing cameras to capture video, Agora recommends that you use the following steps to capture and publish video with multiple cameras:
  1. Call this method to enable multi-channel camera capture.
  2. Call startPreview to start the local video preview.
  3. Call startCameraCapture, and set sourceType to start video capture with the second camera.
  4. Call joinChannelEx, and set publishSecondaryCameraTrack to true to publish the video stream captured by the second camera in the channel.
If you want to disable multi-channel camera capture, use the following steps:
  1. Call stopCameraCapture.
  2. Call this method with enabled set to false.
Note:
You can call this method before and after startPreview to enable multi-camera capture:
  • If it is enabled before startPreview, the local video preview shows the image captured by the two cameras at the same time.
  • If it is enabled after startPreview, the SDK stops the current camera capture first, and then enables the primary camera and the second camera. The local video preview appears black for a short time, and then automatically returns to normal.

This method applies to iOS only.

When using this function, ensure that the system version is 13.0 or later.

The minimum iOS device types that support multi-camera capture are as follows:
  • iPhone XR
  • iPhone XS
  • iPhone XS Max
  • iPad Pro 3rd generation and later

Parameters

enabled
Whether to enable multi-camera video capture mode:
  • true: Enable multi-camera capture mode; the SDK uses multiple cameras to capture video.
  • false: Disable multi-camera capture mode; the SDK uses a single camera to capture video.
config
Capture configuration for the second camera. See CameraCapturerConfiguration.

Returns

  • 0: Success.
  • < 0: Failure.

enableSpatialAudio

Enables or disables the spatial audio effect.

abstract enableSpatialAudio(enabled: boolean): number;

Details

After enabling the spatial audio effect, you can call setRemoteUserSpatialAudioParams to set the spatial audio effect parameters of the remote user.

Note:
  • You can call this method either before or after joining a channel.
  • This method relies on the spatial audio dynamic library libagora_spatial_audio_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

enabled
Whether to enable the spatial audio effect:
  • true: Enable the spatial audio effect.
  • false: Disable the spatial audio effect.

Returns

  • 0: Success.
  • < 0: Failure.

enableSoundPositionIndication

Enables or disables stereo panning for remote users.

abstract enableSoundPositionIndication(enabled: boolean): number;

Details

Ensure that you call this method before joining a channel to enable stereo panning for remote users so that the local user can track the position of a remote user by calling setRemoteVoicePosition.

Parameters

enabled
Whether to enable stereo panning for remote users:
  • true: Enable stereo panning.
  • false: Disable stereo panning.

Returns

  • 0: Success.
  • < 0: Failure.

enableVideo

Enables the video module.

abstract enableVideo(): number;

The video module is disabled by default, call this method to enable it. If you need to disable the video module later, you need to call disableVideo.

Call timing

This method can be called either before joining a channel or while in the channel:
  • If called before joining a channel, it enables the video module.
  • If called during an audio-only call, the audio call automatically switches to a video call.

Restrictions

  • This method enables the internal engine and is valid after leaving the channel.
  • Calling this method will reset the entire engine, resulting in a slow response time. You can use the following methods to independently control a specific function of the video module based on your actual needs:
  • A successful call of this method resets enableLocalVideo, muteRemoteVideoStream, and muteAllRemoteVideoStreams. Proceed it with caution.

Returns

  • 0: Success.
  • < 0: Failure.

enableVideoImageSource

Sets whether to replace the current video feeds with images when publishing video streams.

abstract enableVideoImageSource(
    enable: boolean,
    options: ImageTrackOptions
  ): number;

When publishing video streams, you can call this method to replace the current video feeds with custom images.

Once you enable this function, you can select images to replace the video feeds through the ImageTrackOptions parameter. If you disable this function, the remote users see the video feeds that you publish.

Call timing

Call this method after joining a channel.

Restrictions

None.

Parameters

enable
Whether to replace the current video feeds with custom images:
  • true: Replace the current video feeds with custom images.
  • false: (Default) Do not replace the current video feeds with custom images.
options
Image configurations. See ImageTrackOptions.

Returns

  • 0: Success.
  • < 0: Failure.

enableVirtualBackground

Enables/Disables the virtual background.

abstract enableVirtualBackground(
    enabled: boolean,
    backgroundSource: VirtualBackgroundSource,
    segproperty: SegmentationProperty,
    type?: MediaSourceType
  ): number;

Details

The virtual background feature enables the local user to replace their original background with a static image, dynamic video, blurred background, or portrait-background segmentation to achieve picture-in-picture effect. Once the virtual background feature is enabled, all users in the channel can see the custom background.

Call this method after calling enableVideo or startPreview.

Attention:
  • This feature has high requirements on device performance. When calling this method, the SDK automatically checks the capabilities of the current device. Agora recommends you use virtual background on devices with the following processors:
    • Snapdragon 700 series 750G and later
    • Snapdragon 800 series 835 and later
    • Dimensity 700 series 720 and later
    • Kirin 800 series 810 and later
    • Kirin 900 series 980 and later
    • Devices with an A9 chip and better, as follows:
      • iPhone 6S and later
      • iPad Air 3rd generation and later
      • iPad 5th generation and later
      • iPad Pro 1st generation and later
      • iPad mini 5th generation and later
  • Agora recommends that you use this feature in scenarios that meet the following conditions:
    • A high-definition camera device is used, and the environment is uniformly lit.
    • There are few objects in the captured video. Portraits are half-length and unobstructed. Ensure that the background is a solid color that is different from the color of the user's clothing.
  • This method relies on the virtual background dynamic library libagora_segmentation_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

enabled
Whether to enable virtual background:
  • true: Enable virtual background.
  • false: Disable virtual background.
backgroundSource
The custom background. See VirtualBackgroundSource. To adapt the resolution of the custom background image to that of the video captured by the SDK, the SDK scales and crops the custom background image while ensuring that the content of the custom background image is not distorted.
segproperty
Processing properties for background images. See SegmentationProperty.
type
The type of the video source. See MediaSourceType.
Attention: In this method, this parameter supports only the following two settings:
  • The default value is PrimaryCameraSource.
  • If you want to use the second camera to capture video, set this parameter to SecondaryCameraSource.

Returns

  • 0: Success.
  • < 0: Failure.
    • -4: The device capabilities do not meet the requirements for the virtual background feature. Agora recommends you try it on devices with higher performance.

enableVoiceAITuner

Enables or disables the voice AI tuner.

abstract enableVoiceAITuner(enabled: boolean, type: VoiceAiTunerType): number;

The voice AI tuner supports enhancing sound quality and adjusting tone style.

Applicable scenarios

Social entertainment scenes including online KTV, online podcast and live streaming in showrooms, where high sound quality is required.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

enabled
Whether to enable the voice AI tuner:
  • true: Enables the voice AI tuner.
  • false: (Default) Disable the voice AI tuner.
type
Voice AI tuner sound types, see VoiceAiTunerType.

Returns

  • 0: Success.
  • < 0: Failure.

enableWebSdkInteroperability

Enables interoperability with the Agora Web SDK (applicable only in the live streaming scenarios).

abstract enableWebSdkInteroperability(enabled: boolean): number;

Details

Deprecated:
The SDK automatically enables interoperability with the Web SDK, so you no longer need to call this method.

You can call this method to enable or disable interoperability with the Agora Web SDK. If a channel has Web SDK users, ensure that you call this method, or the video of the Native user will be a black screen for the Web user.

This method is only applicable in live streaming scenarios, and interoperability is enabled by default in communication scenarios.

Parameters

enabled
Whether to enable interoperability:
  • true: Enable interoperability.
  • false: (Default) Disable interoperability.

Returns

  • 0: Success.
  • < 0: Failure.

getAudioDeviceInfo

Gets the audio device information.

abstract getAudioDeviceInfo(): DeviceInfo;

Details

After calling this method, you can get whether the audio device supports ultra-low-latency capture and playback.

Attention:
  • You can call this method either before or after joining a channel.

Returns

The DeviceInfo object that identifies the audio device information.
  • Not null: Success.
  • Null: Failure.

getAudioMixingCurrentPosition

Retrieves the playback position (ms) of the music file.

abstract getAudioMixingCurrentPosition(): number;

Details

Retrieves the playback position (ms) of the audio.

Attention:
  • You need to call this method after calling startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.
  • If you need to call getAudioMixingCurrentPosition multiple times, ensure that the time interval between calling this method is more than 500 ms.

Returns

  • ≥ 0: The current playback position (ms) of the audio mixing, if this method call succeeds. 0 represents that the current music file does not start playing.
  • < 0: Failure.

getAudioMixingDuration

Retrieves the duration (ms) of the music file.

abstract getAudioMixingDuration(): number;

Retrieves the total duration (ms) of the audio.

Call timing

Call this method after startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Restrictions

None.

Returns

  • ≥ 0: The audio mixing duration, if this method call succeeds.
  • < 0: Failure.

getAudioMixingPlayoutVolume

Retrieves the audio mixing volume for local playback.

abstract getAudioMixingPlayoutVolume(): number;

You can call this method to get the local playback volume of the mixed audio file, which helps in troubleshooting volume‑related issues.

Call timing

Call this method after startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Restrictions

None.

Returns

  • ≥ 0: The audio mixing volume, if this method call succeeds. The value range is [0,100].
  • < 0: Failure.

getAudioMixingPublishVolume

Retrieves the audio mixing volume for publishing.

abstract getAudioMixingPublishVolume(): number;

Details

This method helps troubleshoot audio volume‑related issues.

Attention: You need to call this method after calling startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Returns

  • ≥ 0: The audio mixing volume, if this method call succeeds. The value range is [0,100].
  • < 0: Failure.

getAudioTrackCount

Gets the index of audio tracks of the current music file.

abstract getAudioTrackCount(): number;

Details

Note:
  • You need to call this method after calling startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Returns

  • The SDK returns the index of the audio tracks if the method call succeeds.
  • < 0: Failure.

getCallId

Retrieves the call ID.

abstract getCallId(): string;

When a user joins a channel on a client, a callId is generated to identify the call from the client. You can call this method to get the callId parameter, and pass it in when calling methods such as rate and complain.

Call timing

Call this method after joining a channel.

Restrictions

None.

Parameters

callId
Output parameter, the current call ID.

Returns

  • The current call ID, if the method succeeds.
  • An empty string, if the method call fails.

getCameraMaxZoomFactor

Gets the maximum zoom ratio supported by the camera.

abstract getCameraMaxZoomFactor(): number;

Details

Attention:
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Returns

The maximum zoom factor.

getConnectionState

Gets the current connection state of the SDK.

abstract getConnectionState(): ConnectionStateType;

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Returns

The current connection state. See ConnectionStateType.

getCurrentMonotonicTimeInMs

Gets the current Monotonic Time of the SDK.

abstract getCurrentMonotonicTimeInMs(): number;

Monotonic Time refers to a monotonically increasing time series whose value increases over time. The unit is milliseconds.

In custom video capture and custom audio capture scenarios, in order to ensure audio and video synchronization, Agora recommends that you call this method to obtain the current Monotonic Time of the SDK, and then pass this value into the timestamp parameter in the captured video frame (VideoFrame) and audio frame (AudioFrame).

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Returns

  • ≥0: The method call is successful, and returns the current Monotonic Time of the SDK (in milliseconds).
  • < 0: Failure.

getEffectCurrentPosition

Retrieves the playback position of the audio effect file.

abstract getEffectCurrentPosition(soundId: number): number;

Details

Attention: Call this method after playEffect.

Parameters

soundId
The audio effect ID. The ID of each audio effect file is unique.

Returns

  • The playback position (ms) of the specified audio effect file, if the method call succeeds.
  • < 0: Failure.

getEffectDuration

Retrieves the duration of the audio effect file.

abstract getEffectDuration(filePath: string): number;

Details

Attention: Call this method after joining a channel.

Parameters

filePath
File path:
  • Android: The file path, which needs to be accurate to the file name and suffix. Agora supports URL addresses, absolute paths, or file paths that start with /assets/. You might encounter permission issues if you use an absolute path to access a local file, so Agora recommends using a URI address instead. For example: content://com.android.providers.media.documents/document/audio%3A14441
  • iOS: The absolute path or URL address (including the suffixes of the filename) of the audio effect file. For example: /var/mobile/Containers/Data/audio.mp4.

Returns

  • The total duration (ms) of the specified audio effect file, if the method call succeeds.
  • < 0: Failure.

getEffectsVolume

Retrieves the volume of the audio effects.

abstract getEffectsVolume(): number;

Details

The volume is an integer ranging from 0 to 100. The default value is 100, which means the original volume.

Attention: Call this method after playEffect.

Returns

  • Volume of the audio effects, if this method call succeeds.
  • < 0: Failure.

getErrorDescription

Gets the warning or error description.

abstract getErrorDescription(code: number): string;

Parameters

code
The error code or warning code reported by the SDK.

Returns

The specific error or warning description.

getExtensionProperty

Gets detailed information on the extensions.

abstract getExtensionProperty(
    provider: string,
    extension: string,
    key: string,
    bufLen: number,
    type?: MediaSourceType
  ): string;

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

provider
The name of the extension provider.
extension
The name of the extension.
key
The key of the extension.
type
Source type of the extension. See MediaSourceType.
bufLen
Maximum length of the JSON string indicating the extension property. The maximum value is 512 bytes.

Returns

  • The extension information, if the method call succeeds.
  • An empty string, if the method call fails.

getNativeHandle

Gets the C++ handle of the Native SDK.

abstract getNativeHandle(): number;

Details

This method retrieves the C++ handle of the SDK, which is used for registering the audio and video frame observer.

Returns

The native handle of the SDK.

getNetworkType

Gets the type of the local network connection.

abstract getNetworkType(): number;

Details

You can use this method to get the type of network in use at any stage.

Note: You can call this method either before or after joining a channel.

Returns

  • ≥ 0: The method call is successful, and the local network connection type is returned.
    • 0: The SDK disconnects from the network.
    • 1: The network type is LAN.
    • 2: The network type is Wi-Fi (including hotspots).
    • 3: The network type is mobile 2G.
    • 4: The network type is mobile 3G.
    • 5: The network type is mobile 4G.
    • 6: The network type is mobile 5G.
  • < 0: The method call failed with an error code.
    • -1: The network type is unknown.

getNtpWallTimeInMs

Gets the current NTP (Network Time Protocol) time.

abstract getNtpWallTimeInMs(): number;

Details

In the real-time chorus scenario, especially when the downlink connections are inconsistent due to network issues among multiple receiving ends, you can call this method to obtain the current NTP time as the reference time, in order to align the lyrics and music of multiple receiving ends and achieve chorus synchronization.

Returns

The Unix timestamp (ms) of the current NTP time.

getVolumeOfEffect

Gets the volume of a specified audio effect file.

abstract getVolumeOfEffect(soundId: number): number;

Parameters

soundId
The ID of the audio effect file.

Returns

  • ≥ 0: Returns the volume of the specified audio effect, if the method call is successful. The value ranges between 0 and 100. 100 represents the original volume.
  • < 0: Failure.

getVersion

Gets the SDK version.

abstract getVersion(): SDKBuildInfo;

Parameters

Returns

One SDKBuildInfo object.

getUserInfoByUid

Gets the user information by passing in the user ID.

abstract getUserInfoByUid(uid: number): UserInfo;

After a remote user joins the channel, the SDK gets the UID and user account of the remote user, caches them in a mapping table object, and triggers the onUserInfoUpdated callback on the local client. After receiving the callback, you can call this method and passi in the UID.to get the user account of the specified user from the UserInfo object.

Call timing

Call this method after receiving the onUserInfoUpdated callback.

Restrictions

None.

Parameters

uid
The user ID.

Returns

  • A pointer to the UserInfo instance, if the method call succeeds.
  • If the call fails, returns null.

getUserInfoByUserAccount

Gets the user information by passing in the user account.

abstract getUserInfoByUserAccount(userAccount: string): UserInfo;

After a remote user joins the channel, the SDK gets the UID and user account of the remote user, caches them in a mapping table object, and triggers the onUserInfoUpdated callback on the local client. After receiving the callback, you can call this method and pass in the user account to get the UID of the remote user from the UserInfo object.

Call timing

Call this method after receiving the onUserInfoUpdated callback.

Restrictions

None.

Parameters

userAccount
The user account.

Returns

  • A pointer to the UserInfo instance, if the method call succeeds.
  • If the call fails, returns null.

initialize

abstract initialize(context: RtcEngineContext): number;
Attention: All called methods provided by the IRtcEngine class are executed asynchronously. Agora recommends calling these methods in the same thread.

Call timing

Before calling other APIs, you must call createAgoraRtcEngine and initialize to create and initialize the IRtcEngine object.

Restrictions

The SDK supports creating only one IRtcEngine instance for an app.

Parameters

context

Configurations for the IRtcEngine instance. See RtcEngineContext.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).
    • -2: The parameter is invalid.
    • -7: The SDK is not initialized.
    • -22: The resource request failed. The SDK fails to allocate resources because your app consumes too much system resource or the system resources are insufficient.
    • -101: The App ID is invalid.

isCameraAutoExposureFaceModeSupported

Checks whether the device supports auto exposure.

abstract isCameraAutoExposureFaceModeSupported(): boolean;

Details

Attention:
  • This method applies to iOS only.
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Returns

  • true: The device supports auto exposure.
  • false: The device does not support auto exposure.

isCameraAutoFocusFaceModeSupported

Checks whether the device supports the face auto-focus function.

abstract isCameraAutoFocusFaceModeSupported(): boolean;

Details

Attention:
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Returns

  • true: The device supports the face auto-focus function.
  • false: The device does not support the face auto-focus function.

isCameraCenterStageSupported

Check if the camera supports portrait center stage.

abstract isCameraCenterStageSupported(): boolean;
Attention: This method applies to iOS only.

Before calling enableCameraCenterStage to enable portrait center stage, it is recommended to call this method to check if the current device supports the feature.

Call timing

This method must be called after the camera is successfully enabled, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).

Restrictions

None.

Returns

  • true: The current camera supports the portrait center stage.
  • false: The current camera supports the portrait center stage.

isCameraExposurePositionSupported

Checks whether the device supports manual exposure.

abstract isCameraExposurePositionSupported(): boolean;

Details

Attention:
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Returns

  • true: The device supports manual exposure.
  • false: The device does not support manual exposure.

isCameraExposureSupported

Queries whether the current camera supports adjusting exposure value.

abstract isCameraExposureSupported(): boolean;

Details

Attention:
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).
  • Before calling setCameraExposureFactor, Agora recoomends that you call this method to query whether the current camera supports adjusting the exposure value.
  • By calling this method, you adjust the exposure value of the currently active camera, that is, the camera specified when calling setCameraCapturerConfiguration.

Returns

  • true: Success.
  • false: Failure.

isCameraFaceDetectSupported

Checks whether the device camera supports face detection.

abstract isCameraFaceDetectSupported(): boolean;
Attention:
  • This method is for Android and iOS only.
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Returns

  • true: The device camera supports face detection.
  • false: The device camera does not support face detection.

isCameraFocusSupported

Check whether the device supports the manual focus function.

abstract isCameraFocusSupported(): boolean;

Details

Attention:
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Returns

  • true: The device supports the manual focus function.
  • false: The device does not support the manual focus function.

isCameraTorchSupported

Checks whether the device supports camera flash.

abstract isCameraTorchSupported(): boolean;

Details

Attention:
  • This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).
  • The app enables the front camera by default. If your front camera does not support flash, this method returns false. If you want to check whether the rear camera supports the flash function, call switchCamera before this method.
  • On iPads with system version 15, even if isCameraTorchSupported returns true, you might fail to successfully enable the flash by calling setCameraTorchOn due to system issues.

Returns

  • true: The device supports camera flash.
  • false: The device does not support camera flash.

isCameraZoomSupported

Checks whether the device supports camera zoom.

abstract isCameraZoomSupported(): boolean;

Call timing

This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Restrictions

None.

Returns

  • true: The device supports camera zoom.
  • false: The device does not support camera zoom.

isFeatureAvailableOnDevice

Checks whether the device supports the specified advanced feature.

abstract isFeatureAvailableOnDevice(type: FeatureType): boolean;

Details

Checks whether the capabilities of the current device meet the requirements for advanced features such as virtual background and image enhancement.

Applicable scenarios

Before using advanced features, you can check whether the current device supports these features based on the call result. This helps to avoid performance degradation or unavailable features when enabling advanced features on low-end devices. Based on the return value of this method, you can decide whether to display or enable the corresponding feature button, or notify the user when the device's capabilities are insufficient.

Parameters

type
The type of the advanced feature, see FeatureType.

Returns

  • true: The current device supports the specified feature.
  • false: The current device does not support the specified feature.

isSpeakerphoneEnabled

Checks whether the speakerphone is enabled.

abstract isSpeakerphoneEnabled(): boolean;

Call timing

You can call this method either before or after joining a channel.

Restrictions

None.

Returns

  • true: The speakerphone is enabled, and the audio plays from the speakerphone.
  • false: The speakerphone is not enabled, and the audio plays from devices other than the speakerphone. For example, the headset or earpiece.

joinChannel

Joins a channel with media options.

abstract joinChannel(
    token: string,
    channelId: string,
    uid: number,
    options: ChannelMediaOptions
  ): number;

This method supports setting the media options when joining a channel, such as whether to publish audio and video streams within the channel. or whether to automatically subscribe to the audio and video streams of all remote users when joining a channel. By default, the user subscribes to the audio and video streams of all the other users in the channel, giving rise to usage and billings. To stop subscribing to other streams, set the options parameter or call the corresponding mute methods.

Call timing

Call this method after initialize.

Restrictions

  • This method only supports users joining one channel at a time.
  • Users with different App IDs cannot call each other.
  • Before joining a channel, ensure that the App ID you use to generate a token is the same as that you pass in the initialize method; otherwise, you may fail to join the channel with the token.

Parameters

token
The token generated on your server for authentication. See .
Note:
  • (Recommended) If your project has enabled the security mode (using APP ID and Token for authentication), this parameter is required.
  • If you have only enabled the testing mode (using APP ID for authentication), this parameter is optional. You will automatically exit the channel 24 hours after successfully joining in.
  • If you need to join different channels at the same time or switch between channels, Agora recommends using a wildcard token so that you don't need to apply for a new token every time joining a channel. See Secure authentication with tokens.
channelId
The channel name. This parameter signifies the channel in which users engage in real-time audio and video interaction. Under the premise of the same App ID, users who fill in the same channel ID enter the same channel for audio and video interaction. The string length must be less than 64 bytes. Supported characters (89 characters in total):
  • All lowercase English letters: a to z.
  • All uppercase English letters: A to Z.
  • All numeric characters: 0 to 9.
  • "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", "{", "}", "|", "~", ","
uid
The user ID. This parameter is used to identify the user in the channel for real-time audio and video interaction. You need to set and manage user IDs yourself, and ensure that each user ID in the same channel is unique. This parameter is a 32-bit unsigned integer. The value range is 1 to 232-1. If the user ID is not assigned (or set to 0), the SDK assigns a random user ID and onJoinChannelSuccess returns it in the callback. Your application must record and maintain the returned user ID, because the SDK does not do so.
options
The channel media options. See ChannelMediaOptions.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The parameter is invalid. For example, the token is invalid, the uid parameter is not set to an integer, or the value of a member in ChannelMediaOptions is invalid. You need to pass in a valid parameter and join the channel again.
    • -3: Fails to initialize the IRtcEngine object. You need to reinitialize the IRtcEngine object.
    • -7: The IRtcEngine object has not been initialized. You need to initialize the IRtcEngine object before calling this method.
    • -8: The internal state of the IRtcEngine object is wrong. The typical cause is that after calling startEchoTest to start a call loop test, you call this method to join the channel without calling stopEchoTest to stop the test. You need to call stopEchoTest before calling this method.
    • -17: The request to join the channel is rejected. The typical cause is that the user is already in the channel. Agora recommends that you use the onConnectionStateChanged callback to see whether the user is in the channel. Do not call this method to join the channel unless you receive the ConnectionStateDisconnected(1) state.
    • -102: The channel name is invalid. You need to pass in a valid channel name in channelId to rejoin the channel.
    • -121: The user ID is invalid. You need to pass in a valid user ID in uid to rejoin the channel.

joinChannelWithUserAccount

Join a channel using a user account and token, and set the media options.

abstract joinChannelWithUserAccount(
    token: string,
    channelId: string,
    userAccount: string,
    options?: ChannelMediaOptions
  ): number;

Before calling this method, if you have not called registerLocalUserAccount to register a user account, when you call this method to join a channel, the SDK automatically creates a user account for you. Calling the registerLocalUserAccount method to register a user account, and then calling this method to join a channel can shorten the time it takes to enter the channel.

Once a user joins the channel, the user subscribes to the audio and video streams of all the other users in the channel by default, giving rise to usage and billings. To stop subscribing to a specified stream or all remote streams, call the corresponding mute methods.

Attention: To ensure smooth communication, use the same parameter type to identify the user. For example, if a user joins the channel with a UID, then ensure all the other users use the UID too. The same applies to the user account. If a user joins the channel with the Agora Web SDK, ensure that the ID of the user is set to the same parameter type.

Call timing

Call this method after initialize.

Restrictions

  • This method only supports users joining one channel at a time.
  • Users with different App IDs cannot call each other.
  • Before joining a channel, ensure that the App ID you use to generate a token is the same as that you pass in the initialize method; otherwise, you may fail to join the channel with the token.

Parameters

token
The token generated on your server for authentication. See .
Note:
  • (Recommended) If your project has enabled the security mode (using APP ID and Token for authentication), this parameter is required.
  • If you have only enabled the testing mode (using APP ID for authentication), this parameter is optional. You will automatically exit the channel 24 hours after successfully joining in.
  • If you need to join different channels at the same time or switch between channels, Agora recommends using a wildcard token so that you don't need to apply for a new token every time joining a channel. See Secure authentication with tokens.
channelId
The channel name. This parameter signifies the channel in which users engage in real-time audio and video interaction. Under the premise of the same App ID, users who fill in the same channel ID enter the same channel for audio and video interaction. The string length must be less than 64 bytes. Supported characters (89 characters in total):
  • All lowercase English letters: a to z.
  • All uppercase English letters: A to Z.
  • All numeric characters: 0 to 9.
  • "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", "{", "}", "|", "~", ","
userAccount
The user account. This parameter is used to identify the user in the channel for real-time audio and video engagement. You need to set and manage user accounts yourself and ensure that each user account in the same channel is unique. The maximum length of this parameter is 255 bytes. Ensure that you set this parameter and do not set it as null. Supported characters are as follows(89 in total):
  • The 26 lowercase English letters: a to z.
  • The 26 uppercase English letters: A to Z.
  • All numeric characters: 0 to 9.
  • Space
  • "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", "{", "}", "|", "~", ","
options
The channel media options. See ChannelMediaOptions.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The parameter is invalid. For example, the token is invalid, the uid parameter is not set to an integer, or the value of a member in ChannelMediaOptions is invalid. You need to pass in a valid parameter and join the channel again.
    • -3: Fails to initialize the IRtcEngine object. You need to reinitialize the IRtcEngine object.
    • -7: The IRtcEngine object has not been initialized. You need to initialize the IRtcEngine object before calling this method.
    • -8: The internal state of the IRtcEngine object is wrong. The typical cause is that after calling startEchoTest to start a call loop test, you call this method to join the channel without calling stopEchoTest to stop the test. You need to call stopEchoTest before calling this method.
    • -17: The request to join the channel is rejected. The typical cause is that the user is already in the channel. Agora recommends that you use the onConnectionStateChanged callback to see whether the user is in the channel. Do not call this method to join the channel unless you receive the ConnectionStateDisconnected(1) state.
    • -102: The channel name is invalid. You need to pass in a valid channel name in channelId to rejoin the channel.
    • -121: The user ID is invalid. You need to pass in a valid user ID in uid to rejoin the channel.

leaveChannel

Sets channel options and leaves the channel.

abstract leaveChannel(options?: LeaveChannelOptions): number;

After calling this method, the SDK terminates the audio and video interaction, leaves the current channel, and releases all resources related to the session.

After joining the channel, you must call this method to end the call; otherwise, the next call cannot be started. If you have called joinChannelEx to join multiple channels, calling this method will leave all the channels you joined.

Attention: This method call is asynchronous. When this method returns, it does not necessarily mean that the user has left the channel.

Call timing

Call this method after joining a channel.

Restrictions

If you call release immediately after calling this method, the SDK does not trigger the onLeaveChannel callback.

Parameters

options
The options for leaving the channel. See LeaveChannelOptions.

Returns

  • 0: Success.
  • < 0: Failure.

loadExtensionProvider

Loads an extension.

abstract loadExtensionProvider(
    path: string,
    unloadAfterUse?: boolean
  ): number;

This method is used to add extensions external to the SDK (such as those from Extensions Marketplace and SDK extensions) to the SDK.

Call timing

Make sure the IRtcEngine is initialized before you call this method.

Restrictions

If you want to load multiple extensions, you need to call this method multiple times.

Attention: This method is for Android only.

Parameters

path
The extension library path and name. For example: /library/libagora_segmentation_extension.dll.
unloadAfterUse
Whether to uninstall the current extension when you no longer using it:
  • true: Uninstall the extension when the IRtcEngine is destroyed.
  • false: (Rcommended) Do not uninstall the extension until the process terminates.

Returns

  • 0: Success.
  • < 0: Failure.

muteAllRemoteAudioStreams

Stops or resumes subscribing to the audio streams of all remote users.

abstract muteAllRemoteAudioStreams(mute: boolean): number;

After successfully calling this method, the local user stops or resumes subscribing to the audio streams of all remote users, including all subsequent users.

Attention:

By default, the SDK subscribes to the audio streams of all remote users when joining a channel. To modify this behavior, you can set autoSubscribeAudio to false when calling joinChannel to join the channel, which will cancel the subscription to the audio streams of all users upon joining the channel.

Call timing

Call this method after joining a channel.

Restrictions

If you call this method and then call enableAudio or disableAudio, the latest call will prevail.

Parameters

mute
Whether to stop subscribing to the audio streams of all remote users:
  • true: Stops subscribing to the audio streams of all remote users.
  • false: (Default) Subscribes to the audio streams of all remote users by default.

Returns

  • 0: Success.
  • < 0: Failure.

muteAllRemoteVideoStreams

Stops or resumes subscribing to the video streams of all remote users.

abstract muteAllRemoteVideoStreams(mute: boolean): number;

After successfully calling this method, the local user stops or resumes subscribing to the video streams of all remote users, including all subsequent users.

Attention:

By default, the SDK subscribes to the video streams of all remote users when joining a channel. To modify this behavior, you can set autoSubscribeVideo tofalse when calling joinChannel to join the channel, which will cancel the subscription to the video streams of all users upon joining the channel.

Call timing

Call this method after joining a channel.

Restrictions

If you call this method and then call enableVideo or disableVideo, the latest call will prevail.

Parameters

mute
Whether to stop subscribing to the video streams of all remote users.
  • true: Stop subscribing to the video streams of all remote users.
  • false: (Default) Subscribe to the video streams of all remote users by default.

Returns

  • 0: Success.
  • < 0: Failure.

muteLocalAudioStream

Stops or resumes publishing the local audio stream.

abstract muteLocalAudioStream(mute: boolean): number;

This method is used to control whether to publish the locally captured audio stream. If you call this method to stop publishing locally captured audio streams, the audio capturing device will still work and won't be affected.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

mute
Whether to stop publishing the local audio stream:
  • true: Stops publishing the local audio stream.
  • false: (Default) Resumes publishing the local audio stream.

Returns

  • 0: Success.
  • < 0: Failure.

muteLocalVideoStream

Stops or resumes publishing the local video stream.

abstract muteLocalVideoStream(mute: boolean): number;

This method is used to control whether to publish the locally captured video stream. If you call this method to stop publishing locally captured video streams, the video capturing device will still work and won't be affected.

Compared to enableLocalVideo(false), which can also cancel the publishing of local video stream by turning off the local video stream capture, this method responds faster.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

mute
Whether to stop publishing the local video stream.
  • true: Stop publishing the local video stream.
  • false: (Default) Publish the local video stream.

Returns

  • 0: Success.
  • < 0: Failure.

muteRecordingSignal

Whether to mute the recording signal.

abstract muteRecordingSignal(mute: boolean): number;
If you have already called adjustRecordingSignalVolume to adjust the recording signal volume, when you call this method and set it to true, the SDK behaves as follows:
  1. Records the adjusted volume.
  2. Mutes the recording signal.
When you call this method again and set it to false, the recording signal volume will be restored to the volume recorded by the SDK before muting.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

mute
  • true: Mute the recording signal.
  • false: (Default) Do not mute the recording signal.

Returns

  • 0: Success.
  • < 0: Failure.

muteRemoteAudioStream

Stops or resumes subscribing to the audio stream of a specified user.

abstract muteRemoteAudioStream(uid: number, mute: boolean): number;

Call timing

Call this method after joining a channel.

Restrictions

None.

Parameters

uid
The user ID of the specified user.
mute
Whether to subscribe to the specified remote user's audio stream.
  • true: Stop subscribing to the audio stream of the specified user.
  • false: (Default) Subscribe to the audio stream of the specified user.

Returns

  • 0: Success.
  • < 0: Failure.

muteRemoteVideoStream

Stops or resumes subscribing to the video stream of a specified user.

abstract muteRemoteVideoStream(uid: number, mute: boolean): number;

Call timing

Call this method after joining a channel.

Restrictions

None.

Parameters

uid
The user ID of the specified user.
mute
Whether to subscribe to the specified remote user's video stream.
  • true: Stop subscribing to the video streams of the specified user.
  • false: (Default) Subscribe to the video stream of the specified user.

Returns

  • 0: Success.
  • < 0: Failure.

pauseAllChannelMediaRelay

Pauses the media stream relay to all target channels.

abstract pauseAllChannelMediaRelay(): number;

Details

After the cross-channel media stream relay starts, you can call this method to pause relaying media streams to all target channels; after the pause, if you want to resume the relay, call resumeAllChannelMediaRelay.

Attention: Call this method after startOrUpdateChannelMediaRelay.

Returns

  • 0: Success.
  • < 0: Failure.
    • -5: The method call was rejected. There is no ongoing channel media relay.

pauseAllEffects

Pauses all audio effects.

abstract pauseAllEffects(): number;

Returns

  • 0: Success.
  • < 0: Failure.

pauseAudioMixing

Pauses playing and mixing the music file.

abstract pauseAudioMixing(): number;

After calling startAudioMixing to play a music file, you can call this method to pause the playing. If you need to stop the playback, call stopAudioMixing.

Call timing

Call this method after joining a channel.

Restrictions

None.

Returns

  • 0: Success.
  • < 0: Failure.

pauseEffect

Pauses a specified audio effect file.

abstract pauseEffect(soundId: number): number;

Parameters

soundId
The audio effect ID. The ID of each audio effect file is unique.

Returns

  • 0: Success.
  • < 0: Failure.

playAllEffects

Plays all audio effect files.

abstract playAllEffects(
    loopCount: number,
    pitch: number,
    pan: number,
    gain: number,
    publish?: boolean
  ): number;

Details

After calling preloadEffect multiple times to preload multiple audio effects into the memory, you can call this method to play all the specified audio effects for all users in the channel.

Parameters

loopCount
The number of times the audio effect loops:
  • -1: Play the audio effect files in an indefinite loop until you call stopEffect or stopAllEffects.
  • 0: Play the audio effect once.
  • 1: Play the audio effect twice.
pitch

The pitch of the audio effect. The value ranges between 0.5 and 2.0. The default value is 1.0 (original pitch). The lower the value, the lower the pitch.

pan
The spatial position of the audio effect. The value ranges between -1.0 and 1.0:
  • -1.0: The audio effect shows on the left.
  • 0: The audio effect shows ahead.
  • 1.0: The audio effect shows on the right.
gain

The volume of the audio effect. The value range is [0, 100]. The default value is 100 (original volume). The smaller the value, the lower the volume.

publish
Whether to publish the audio effect to the remote users:
  • true: Publish the audio effect to the remote users. Both the local user and remote users can hear the audio effect.
  • false: (Default) Do not publish the audio effect to the remote users. Only the local user can hear the audio effect.

Returns

  • 0: Success.
  • < 0: Failure.

playEffect

Plays the specified local or online audio effect file.

abstract playEffect(
    soundId: number,
    filePath: string,
    loopCount: number,
    pitch: number,
    pan: number,
    gain: number,
    publish?: boolean,
    startPos?: number
  ): number;

To play multiple audio effect files at the same time, call this method multiple times with different soundId and filePath. To achieve the optimal user experience, Agora recommends that you do not playing more than three audio files at the same time.

Call timing

You can call this method either before or after joining a channel.

Restrictions

If you need to play an online audio effect file, Agora recommends that you cache the online audio effect file to your local device, call preloadEffect to preload the file into memory, and then call this method to play the audio effect. Otherwise, you might encounter playback failures or no sound during playback due to loading timeouts or failures.

Parameters

soundId
The audio effect ID. The ID of each audio effect file is unique.
Attention: If you have preloaded an audio effect into memory by calling preloadEffect, ensure that the value of this parameter is the same as that of soundId in preloadEffect.
filePath

The file path. The SDK supports URLs and absolute path of local files. The absolute path needs to be accurate to the file name and extension. Supported audio formats include MP3, AAC, M4A, MP4, WAV, and 3GP.

Attention: If you have preloaded an audio effect into memory by calling preloadEffect, ensure that the value of this parameter is the same as that of filePath in preloadEffect.
loopCount
The number of times the audio effect loops.
  • ≥ 0: The number of playback times. For example, 1 means looping one time, which means playing the audio effect two times in total.
  • -1: Play the audio file in an infinite loop.
pitch
The pitch of the audio effect. The value range is 0.5 to 2.0. The default value is 1.0, which means the original pitch. The lower the value, the lower the pitch.
pan
The spatial position of the audio effect. The value ranges between -1.0 and 1.0:
  • -1.0: The audio effect is heard on the left of the user.
  • 0.0: The audio effect is heard in front of the user.
  • 1.0: The audio effect is heard on the right of the user.
gain
The volume of the audio effect. The value range is 0.0 to 100.0. The default value is 100.0, which means the original volume. The smaller the value, the lower the volume.
publish
Whether to publish the audio effect to the remote users:
  • true: Publish the audio effect to the remote users. Both the local user and remote users can hear the audio effect.
  • false: Do not publish the audio effect to the remote users. Only the local user can hear the audio effect.
startPos

The playback position (ms) of the audio effect file.

Returns

  • 0: Success.
  • < 0: Failure.

preloadChannel

Preloads a channel with token, channelId, and uid.

abstract preloadChannel(
    token: string,
    channelId: string,
    uid: number
  ): number;

When audience members need to switch between different channels frequently, calling the method can help shortening the time of joining a channel, thus reducing the time it takes for audience members to hear and see the host.

If you join a preloaded channel, leave it and want to rejoin the same channel, you do not need to call this method unless the token for preloading the channel expires.

Note: Failing to preload a channel does not mean that you can't join a channel, nor will it increase the time of joining a channel.

Call timing

To improve the user experience of preloading channels, Agora recommends that before joining the channel, calling this method as early as possible once confirming the channel name and user information.

Restrictions

  • When calling this method, ensure you set the user role as audience and do not set the audio scenario as AudioScenarioChorus, otherwise, this method does not take effect.
  • You also need to make sure that the channel name, user ID and token passed in for preloading are the same as the values passed in when joinning the channel, otherwise, this method does not take effect.
  • One IRtcEngine instance supports preloading 20 channels at most. When exceeding this limit, the latest 20 preloaded channels take effect.

Parameters

token
The token generated on your server for authentication. See .
When the token for preloading channels expires, you can update the token based on the number of channels you preload.
  • When preloading one channel, calling this method to pass in the new token.
  • When preloading more than one channels:
    • If you use a wildcard token for all preloaded channels, call updatePreloadChannelToken to update the token.
      Note: When generating a wildcard token, ensure the user ID is not set as 0. See Secure authentication with tokens.
    • If you use different tokens to preload different channels, call this method to pass in your user ID, channel name and the new token.
channelId
The channel name that you want to preload. This parameter signifies the channel in which users engage in real-time audio and video interaction. Under the premise of the same App ID, users who fill in the same channel ID enter the same channel for audio and video interaction. The string length must be less than 64 bytes. Supported characters (89 characters in total):
  • All lowercase English letters: a to z.
  • All uppercase English letters: A to Z.
  • All numeric characters: 0 to 9.
  • "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", "{", "}", "|", "~", ","
uid
The user ID. This parameter is used to identify the user in the channel for real-time audio and video interaction. You need to set and manage user IDs yourself, and ensure that each user ID in the same channel is unique. This parameter is a 32-bit unsigned integer. The value range is 1 to 232-1. If the user ID is not assigned (or set to 0), the SDK assigns a random user ID and onJoinChannelSuccess returns it in the callback. Your application must record and maintain the returned user ID, because the SDK does not do so.

Returns

  • 0: Success.
  • < 0: Failure.
    • -7: The IRtcEngine object has not been initialized. You need to initialize the IRtcEngine object before calling this method.
    • -102: The channel name is invalid. You need to pass in a valid channel name and join the channel again.

preloadChannelWithUserAccount

Preloads a channel with token, channelId, and userAccount.

abstract preloadChannelWithUserAccount(
    token: string,
    channelId: string,
    userAccount: string
  ): number;

When audience members need to switch between different channels frequently, calling the method can help shortening the time of joining a channel, thus reducing the time it takes for audience members to hear and see the host.

If you join a preloaded channel, leave it and want to rejoin the same channel, you do not need to call this method unless the token for preloading the channel expires.

Note: Failing to preload a channel does not mean that you can't join a channel, nor will it increase the time of joining a channel.

Call timing

To improve the user experience of preloading channels, Agora recommends that before joining the channel, calling this method as early as possible once confirming the channel name and user information.

Restrictions

  • When calling this method, ensure you set the user role as audience and do not set the audio scenario as AudioScenarioChorus, otherwise, this method does not take effect.
  • You also need to make sure that the User Account, channel ID and token passed in for preloading are the same as the values passed in when joining the channel, otherwise, this method does not take effect.
  • One IRtcEngine instance supports preloading 20 channels at most. When exceeding this limit, the latest 20 preloaded channels take effect.

Parameters

token
The token generated on your server for authentication. See .
When the token for preloading channels expires, you can update the token based on the number of channels you preload.
  • When preloading one channel, calling this method to pass in the new token.
  • When preloading more than one channels:
    • If you use a wildcard token for all preloaded channels, call updatePreloadChannelToken to update the token.
      Note: When generating a wildcard token, ensure the user ID is not set as 0. See Secure authentication with tokens.
    • If you use different tokens to preload different channels, call this method to pass in your user ID, channel name and the new token.
channelId
The channel name that you want to preload. This parameter signifies the channel in which users engage in real-time audio and video interaction. Under the premise of the same App ID, users who fill in the same channel ID enter the same channel for audio and video interaction. The string length must be less than 64 bytes. Supported characters (89 characters in total):
  • All lowercase English letters: a to z.
  • All uppercase English letters: A to Z.
  • All numeric characters: 0 to 9.
  • "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", "{", "}", "|", "~", ","
userAccount
The user account. This parameter is used to identify the user in the channel for real-time audio and video engagement. You need to set and manage user accounts yourself and ensure that each user account in the same channel is unique. The maximum length of this parameter is 255 bytes. Ensure that you set this parameter and do not set it as null. Supported characters are as follows(89 in total):
  • The 26 lowercase English letters: a to z.
  • The 26 uppercase English letters: A to Z.
  • All numeric characters: 0 to 9.
  • Space
  • "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", "{", "}", "|", "~", ","

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The parameter is invalid. For example, the User Account is empty. You need to pass in a valid parameter and join the channel again.
    • -7: The IRtcEngine object has not been initialized. You need to initialize the IRtcEngine object before calling this method.
    • -102: The channel name is invalid. You need to pass in a valid channel name and join the channel again.

preloadEffect

Preloads a specified audio effect file into the memory.

abstract preloadEffect(
    soundId: number,
    filePath: string,
    startPos?: number
  ): number;

Ensure the size of all preloaded files does not exceed the limit.

For the audio file formats supported by this method, see What formats of audio files does the Agora RTC SDK support.

Call timing

Agora recommends that you call this method before joining a channel.

Restrictions

None.

Parameters

soundId
The audio effect ID. The ID of each audio effect file is unique.
filePath
File path:
  • Android: The file path, which needs to be accurate to the file name and suffix. Agora supports URL addresses, absolute paths, or file paths that start with /assets/. You might encounter permission issues if you use an absolute path to access a local file, so Agora recommends using a URI address instead. For example: content://com.android.providers.media.documents/document/audio%3A14441
  • iOS: The absolute path or URL address (including the suffixes of the filename) of the audio effect file. For example: /var/mobile/Containers/Data/audio.mp4.
startPos
The playback position (ms) of the audio effect file.

Returns

  • 0: Success.
  • < 0: Failure.

queryCameraFocalLengthCapability

Queries the focal length capability supported by the camera.

abstract queryCameraFocalLengthCapability(): {
    focalLengthInfos: FocalLengthInfo[];
    size: number;
  };

Details

If you want to enable the wide-angle or ultra-wide-angle mode for camera capture, it is recommended to start by calling this method to check whether the device supports the required focal length capability. Then, adjust the camera's focal length configuration based on the query result by calling setCameraCapturerConfiguration, ensuring the best camera capture performance.

Returns

Returns an object containing the following properties:
  • focalLengthInfos: An array of FocalLengthInfo objects, which contain the camera's orientation and focal length type.
  • size: The number of focal length information items retrieved.

queryCodecCapability

Queries the video codec capabilities of the SDK.

abstract queryCodecCapability(): { codecInfo: CodecCapInfo[]; size: number };

Details

Returns

  • If the call is successful, an object containing the following attributes is returned:
    • codecInfo: The CodecCapInfo array, indicating the video codec capabillity of the device.
    • size: The size of the CodecCapInfo array.
  • If the call timeouts, please modify the call logic and do not invoke the method in the main thread.

queryDeviceScore

Queries device score.

abstract queryDeviceScore(): number;

Details

Applicable scenarios

In high-definition or ultra-high-definition video scenarios, you can first call this method to query the device's score. If the returned score is low (for example, below 60), you need to lower the video resolution to avoid affecting the video experience. The minimum device score required for different business scenarios is varied. For specific score recommendations, please technical support.

Returns

  • >0: The method call succeeeds, the value is the current device's score, the range is [0,100], the larger the value, the stronger the device capability. Most devices are rated between 60 and 100.
  • < 0: Failure.

queryScreenCaptureCapability

Queries the highest frame rate supported by the device during screen sharing.

abstract queryScreenCaptureCapability(): number;

Details

Applicable scenarios

To ensure optimal screen sharing performance, particularly in enabling high frame rates like 60 fps, Agora recommends you to query the device's maximum supported frame rate using this method beforehand. This way, if the device cannot support such a high frame rate, you can adjust the screen sharing stream accordingly to avoid any negative impact on the sharing quality. If the device does not support high frame rate, you can reduce the frame rate of the screen sharing stream appropriately when sharing the screen to ensure that the sharing effect meets your expectation.

Returns

  • The highest frame rate supported by the device, if the method is called successfully. See ScreenCaptureFramerateCapability.
  • < 0: Failure.

rate

Allows a user to rate a call after the call ends.

abstract rate(callId: string, rating: number, description: string): number;

Details

Attention: Ensure that you call this method after leaving a channel.

Parameters

callId
The current call ID. You can get the call ID by calling getCallId.
rating
The value is between 1 (the lowest score) and 5 (the highest score).
description
A description of the call. The string length should be less than 800 bytes.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).
    • -2: The parameter is invalid.

registerAudioEncodedFrameObserver

Registers an encoded audio observer.

abstract registerAudioEncodedFrameObserver(
    config: AudioEncodedFrameObserverConfig,
    observer: IAudioEncodedFrameObserver
  ): number;

Details

Attention:
  • Call this method after joining a channel.
  • You can call this method or startAudioRecording to set the recording type and quality of audio files, but Agora does not recommend using this method and startAudioRecording at the same time. Only the method called later will take effect.

Parameters

config
Observer settings for the encoded audio. See AudioEncodedFrameObserverConfig.
The encoded audio observer. See IAudioEncodedFrameObserver.

Returns

One IAudioEncodedFrameObserver object.

registerAudioSpectrumObserver

Register an audio spectrum observer.

abstract registerAudioSpectrumObserver(
    observer: IAudioSpectrumObserver
  ): number;

Details

After successfully registering the audio spectrum observer and calling enableAudioSpectrumMonitor to enable the audio spectrum monitoring, the SDK reports the callback that you implement in the IAudioSpectrumObserver class according to the time interval you set.

Attention: You can call this method either before or after joining a channel.

Parameters

observer

The audio spectrum observer. See IAudioSpectrumObserver.

Returns

One IAudioSpectrumObserver object.

registerEventHandler

Adds event handlers

abstract registerEventHandler(eventHandler: IRtcEngineEventHandler): boolean;

Details

The SDK uses the IRtcEngineEventHandler class to send callbacks to the app. The app inherits the methods of this class to receive these callbacks. All methods in this class have default (empty) implementations. Therefore, apps only need to inherits callbacks according to the scenarios. In the callbacks, avoid time-consuming tasks or calling APIs that can block the thread, such as the sendStreamMessage method. Otherwise, the SDK may not work properly.

Parameters

eventHandler
Callback events to be added. See IRtcEngineEventHandler.

Returns

  • true: Success.
  • false: Failure.

unregisterEventHandler

Removes the specified callback events.

abstract unregisterEventHandler(
                eventHandler: IRtcEngineEventHandler
              ): boolean;

Details

You can call this method too remove all added callback events.

Parameters

eventHandler
Callback events to be removed. See IRtcEngineEventHandler.

Returns

  • true: Success.
  • false: Failure.

registerExtension

Registers an extension.

abstract registerExtension(
    provider: string,
    extension: string,
    type?: MediaSourceType
  ): number;

For extensions external to the SDK (such as those from Extensions Marketplace and SDK Extensions), you need to load them before calling this method. Extensions internal to the SDK (those included in the full SDK package) are automatically loaded and registered after the initialization of IRtcEngine.

Call timing

  • Agora recommends you call this method after the initialization of IRtcEngine and before joining a channel.
  • For video extensions (such as the image enhancement extension), you need to call this method after enabling the video module by calling enableVideo or enableLocalVideo.
  • Before calling this method, you need to call loadExtensionProvider to load the extension first.

Restrictions

  • If you want to register multiple extensions, you need to call this method multiple times.
  • The data processing order of different extensions in the SDK is determined by the order in which the extensions are registered. That is, the extension that is registered first will process the data first.

Parameters

provider
The name of the extension provider.
extension
The name of the extension.
type
Source type of the extension. See MediaSourceType.

Returns

registerLocalUserAccount

Registers a user account.

abstract registerLocalUserAccount(appId: string, userAccount: string): number;

Once registered, the user account can be used to identify the local user when the user joins the channel. After the registration is successful, the user account can identify the identity of the local user, and the user can use it to join the channel.

This method is optional. If you want to join a channel using a user account, you can choose one of the following methods:
  • Call the registerLocalUserAccount method to register a user account, and then call the joinChannelWithUserAccount method to join a channel, which can shorten the time it takes to enter the channel.
  • Call the joinChannelWithUserAccount method to join a channel.
Attention:
  • Ensure that the userAccount is unique in the channel.
  • To ensure smooth communication, use the same parameter type to identify the user. For example, if a user joins the channel with a UID, then ensure all the other users use the UID too. The same applies to the user account. If a user joins the channel with the Agora Web SDK, ensure that the ID of the user is set to the same parameter type.

Restrictions

None.

Parameters

appId
The App ID of your project on Agora Console.
userAccount
The user account. This parameter is used to identify the user in the channel for real-time audio and video engagement. You need to set and manage user accounts yourself and ensure that each user account in the same channel is unique. The maximum length of this parameter is 255 bytes. Ensure that you set this parameter and do not set it as null. Supported characters are as follow(89 in total):
  • The 26 lowercase English letters: a to z.
  • The 26 uppercase English letters: A to Z.
  • All numeric characters: 0 to 9.
  • Space
  • "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", "{", "}", "|", "~", ","

Returns

  • 0: Success.
  • < 0: Failure.

registerMediaMetadataObserver

Registers the metadata observer.

abstract registerMediaMetadataObserver(
    observer: IMetadataObserver,
    type: MetadataType
  ): number;

Details

You need to implement the IMetadataObserver class and specify the metadata type in this method. This method enables you to add synchronized metadata in the video stream for more diversified live interactive streaming, such as sending shopping links, digital coupons, and online quizzes.

Attention: Call this method before joinChannel.

Parameters

observer
The metadata observer. See IMetadataObserver.
type

The metadata type. The SDK currently only supports VideoMetadata. See MetadataType.

Returns

  • 0: Success.
  • < 0: Failure.

release

Releases the IRtcEngine instance.

abstract release(sync?: boolean): void;

Details

This method releases all resources used by the Agora SDK. Use this method for apps in which users occasionally make voice or video calls. When users do not make calls, you can free up resources for other operations.

After a successful method call, you can no longer use any method or callback in the SDK anymore. If you want to use the real-time communication functions again, you must call createAgoraRtcEngine and initialize to create a new IRtcEngine instance.

Attention:
  • This method can be called synchronously. You need to wait for the resource of IRtcEngine to be released before performing other operations (for example, create a new IRtcEngine object). Therefore, Agora recommends calling this method in the child thread to avoid blocking the main thread.
  • Besides, Agora does not recommend you calling release in any callback of the SDK. Otherwise, the SDK cannot release the resources until the callbacks return results, which may result in a deadlock.

Parameters

sync

Whether the method is called synchronously:

  • true: Synchronous call.
  • false: Asynchronous call. Currently this method only supports synchronous calls. Do not set this parameter to this value.

renewToken

Renews the token.

abstract renewToken(token: string): number;

You can call this method to pass a new token to the SDK. A token will expire after a certain period of time, at which point the SDK will be unable to establish a connection with the server.

Call timing

In any of the following cases, Agora recommends that you generate a new token on your server and then call this method to renew your token:

Restrictions

None.

Parameters

token
The new token.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The parameter is invalid. For example, the token is empty.
    • -7: The IRtcEngine object has not been initialized. You need to initialize the IRtcEngine object before calling this method.
    • 110: Invalid token. Ensure the following:
      • The user ID specified when generating the token is consistent with the user ID used when joining the channel.
      • The generated token is the same as the token passed in to join the channel.

removeAllListeners

Removes all listeners for the specified event.

removeAllListeners?<EventType extends keyof IMediaEngineEvent>(
      eventType?: EventType
    ): void;

Details

Parameters

eventType
The name of the target event to listen for. See IRtcEngineEvent.

removeListener

Removes the specified IRtcEngineEvent listener.

removeListener?<EventType extends keyof IRtcEngineEvent>(
      eventType: EventType,
      listener: IRtcEngineEvent[EventType]
    ): void;

Details

For listened events, if you no longer need to receive the callback message, you can call this method to remove the corresponding listener.

Parameters

eventType
The name of the target event to listen for. See IRtcEngineEvent.
listener
The callback function for eventType. Must pass in the same function object in addListener. Take removing the listener for onJoinChannelSuccess as an example:
// Create an onJoinChannelSuccess object
const onJoinChannelSuccess = (connection: RtcConnection, elapsed: number) => {};
// Add one onJoinChannelSuccess listener
engine.addListener('onJoinChannelSuccess', onJoinChannelSuccess);
// Remove the onJoinChannelSuccess listener
engine.removeListener('onJoinChannelSuccess', onJoinChannelSuccess);

resumeAllChannelMediaRelay

Resumes the media stream relay to all target channels.

abstract resumeAllChannelMediaRelay(): number;

Details

After calling the pauseAllChannelMediaRelay method, you can call this method to resume relaying media streams to all destination channels.

Attention: Call this method after pauseAllChannelMediaRelay.

Returns

  • 0: Success.
  • < 0: Failure.
    • -5: The method call was rejected. There is no paused channel media relay.

resumeAllEffects

Resumes playing all audio effect files.

abstract resumeAllEffects(): number;

After you call pauseAllEffects to pause the playback, you can call this method to resume the playback.

Call timing

Call this method after pauseAllEffects.

Restrictions

None.

Returns

  • 0: Success.
  • < 0: Failure.

resumeAudioMixing

Resumes playing and mixing the music file.

abstract resumeAudioMixing(): number;

After calling pauseAudioMixing to pause the playback, you can call this method to resume the playback.

Call timing

Call this method after joining a channel.

Restrictions

None.

Returns

  • 0: Success.
  • < 0: Failure.

resumeEffect

Resumes playing a specified audio effect.

abstract resumeEffect(soundId: number): number;

Parameters

soundId
The audio effect ID. The ID of each audio effect file is unique.

Returns

  • 0: Success.
  • < 0: Failure.

selectAudioTrack

Selects the audio track used during playback.

abstract selectAudioTrack(index: number): number;

Details

After getting the track index of the audio file, you can call this method to specify any track to play. For example, if different tracks of a multi-track file store songs in different languages, you can call this method to set the playback language.

Note:

Parameters

index
The audio track you want to specify. The value should be greater than 0 and less than that of returned by getAudioTrackCount.

Returns

  • 0: Success.
  • < 0: Failure.

selectMultiAudioTrack

Selects the audio tracks that you want to play on your local device and publish to the channel respectively.

abstract selectMultiAudioTrack(
    playoutTrackIndex: number,
    publishTrackIndex: number
  ): number;

Details

You can call this method to determine the audio track to be played on your local device and published to the channel.

Before calling this method, you need to open the media file with the openWithMediaSource method and set enableMultiAudioTrack in MediaSource as true.

Applicable scenarios

For example, in KTV scenarios, the host can choose to play the original sound locally and publish the accompaniment track to the channel.

Parameters

playoutTrackIndex
The index of audio tracks for local playback. You can obtain the index through getStreamInfo.
publishTrackIndex
The index of audio tracks to be published in the channel. You can obtain the index through getStreamInfo.

Returns

  • 0: Success.
  • < 0: Failure.

sendCustomReportMessage

Reports customized messages.

abstract sendCustomReportMessage(
    id: string,
    category: string,
    event: string,
    label: string,
    value: number
  ): number;

Details

Agora supports reporting and analyzing customized messages. This function is in the beta stage with a free trial. The ability provided in its beta test version is reporting a maximum of 10 message pieces within 6 seconds, with each message piece not exceeding 256 bytes and each string not exceeding 100 bytes. To try out this function, contact support@agora.io and discuss the format of customized messages with us.

sendMetaData

Sends media metadata.

abstract sendMetaData(metadata: Metadata, sourceType: VideoSourceType): number;

Details

If the metadata is sent successfully, the SDK triggers the onMetadataReceived callback on the receiver.

Parameters

metadata
Media metadata. See Metadata.
sourceType
The type of the video source. See VideoSourceType.

Returns

  • 0: Success.
  • < 0: Failure.

sendStreamMessage

Sends data stream messages.

abstract sendStreamMessage(
  streamId: number,
  data: Uint8Array,
  length: number
): number;

Details

After calling createDataStream, you can call this method to send data stream messages to all users in the channel.

The SDK has the following restrictions on this method:
  • Each user can have up to five data streams simultaneously.
  • Up to 60 packets can be sent per second in a data stream with each packet having a maximum size of 1 KB.
  • Up to 30 KB of data can be sent per second in a data stream.

A successful method call triggers the onStreamMessage callback on the remote client, from which the remote user gets the stream message. A failed method call triggers the onStreamMessageError callback on the remote client.

Attention:
  • This method needs to be called after createDataStream and joining the channel.
  • In live streaming scenarios, this method only applies to hosts.

Parameters

streamId
The data stream ID. You can get the data stream ID by calling createDataStream.
data
The message to be sent.
length
The length of the data.

Returns

  • 0: Success.
  • < 0: Failure.

setAdvancedAudioOptions

Sets audio advanced options.

abstract setAdvancedAudioOptions(options: AdvancedAudioOptions): number;

Details

If you have advanced audio processing requirements, such as capturing and sending stereo audio, you can call this method to set advanced audio options.

Attention: Call this method after calling joinChannel, enableAudio and enableLocalAudio.

Parameters

options
The advanced options for audio. See AdvancedAudioOptions.

Returns

  • 0: Success.
  • < 0: Failure.

setAINSMode

Sets whether to enable the AI ​​noise suppression function and set the noise suppression mode.

abstract setAINSMode(enabled: boolean, mode: AudioAinsMode): number;
You can call this method to enable AI noise suppression function. Once enabled, the SDK automatically detects and reduces stationary and non-stationary noise from your audio on the premise of ensuring the quality of human voice. Stationary noise refers to noise signal with constant average statistical properties and negligibly small fluctuations of level within the period of observation. Common sources of stationary noises are:
  • Television;
  • Air conditioner;
  • Machinery, etc.
Non-stationary noise refers to noise signal with huge fluctuations of level within the period of observation; common sources of non-stationary noises are:
  • Thunder;
  • Explosion;
  • Cracking, etc.

Applicable scenarios

In scenarios such as co-streaming, online education and video meeting, this function can detect and reduce background noises to improve experience.

Call timing

You can call this method either before or after joining a channel.

Restrictions

  • This method relies on the AI noise suppression dynamic library. If the dynamic library is deleted, the function cannot be enabled. For the name of the AI ​​noise suppression dynamic library, see App size optimization.
  • Agora does not recommend enabling this function on devices running Android 6.0 and below.

Parameters

enabled
Whether to enable the AI noise suppression function:
  • true: Enable the AI noise suppression.
  • false: (Default) Disable the AI noise suppression.
mode

The AI noise suppression modes. See AudioAinsMode.

Returns

  • 0: Success.
  • < 0: Failure.

setAudioEffectParameters

Sets parameters for SDK preset audio effects.

abstract setAudioEffectParameters(
  preset: AudioEffectPreset,
  param1: number,
  param2: number
): number;

Details

Call this method to set the following parameters for the local user who sends an audio stream:
  • 3D voice effect: Sets the cycle period of the 3D voice effect.
  • Pitch correction effect: Sets the basic mode and tonic pitch of the pitch correction effect. Different songs have different modes and tonic pitches. Agora recommends bounding this method with interface elements to enable users to adjust the pitch correction interactively.

After setting the audio parameters, all users in the channel can hear the effect.

To achieve better vocal effects, it is recommended that you call the following APIs before calling this method:
  • Call setAudioScenario to set the audio scenario to high-quality audio scenario, namely AudioScenarioGameStreaming(3).
  • Call setAudioProfile to set the profile parameter to AudioProfileMusicHighQuality(4) or AudioProfileMusicHighQualityStereo(5).
Attention:
  • You can call this method either before or after joining a channel.
  • Do not set the profile parameter in setAudioProfile to AudioProfileSpeechStandard(1) or AudioProfileIot(6), or the method does not take effect.
  • This method has the best effect on human voice processing, and Agora does not recommend calling this method to process audio data containing music.
  • After calling setAudioEffectParameters, Agora does not recommend you to call the following methods, otherwise the effect set by setAudioEffectParameters will be overwritten:
  • This method relies on the voice beautifier dynamic library libagora_audio_beauty_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

preset
The options for SDK preset audio effects:
  • RoomAcoustics3dVoice, 3D voice effect:
    • You need to set the profile parameter in setAudioProfile to AudioProfileMusicStandardStereo(3) or AudioProfileMusicHighQualityStereo(5) before setting this enumerator; otherwise, the enumerator setting does not take effect.
    • If the 3D voice effect is enabled, users need to use stereo audio playback devices to hear the anticipated voice effect.
  • PitchCorrection, Pitch correction effect:
param1
  • If you set preset to RoomAcoustics3dVoice, param1 sets the cycle period of the 3D voice effect. The value range is [1,60] and the unit is seconds. The default value is 10, indicating that the voice moves around you every 10 seconds.
  • If you set preset to PitchCorrection, param1 indicates the basic mode of the pitch correction effect:
    • 1: (Default) Natural major scale.
    • 2: Natural minor scale.
    • 3: Japanese pentatonic scale.
param2
  • If you set preset to RoomAcoustics3dVoice , you need to set param2 to 0.
  • If you set preset to PitchCorrection, param2 indicates the tonic pitch of the pitch correction effect:
    • 1: A
    • 2: A#
    • 3: B
    • 4: (Default) C
    • 5: C#
    • 6: D
    • 7: D#
    • 8: E
    • 9: F
    • 10: F#
    • 11: G
    • 12: G#

Returns

  • 0: Success.
  • < 0: Failure.

setAudioEffectPreset

Sets an SDK preset audio effect.

abstract setAudioEffectPreset(preset: AudioEffectPreset): number;

Call this method to set an SDK preset audio effect for the local user who sends an audio stream. This audio effect does not change the gender characteristics of the original voice. After setting an audio effect, all users in the channel can hear the effect.

Call timing

This method can be called either before or after joining the channel.

To achieve better vocal effects, it is recommended that you call the following APIs before calling this method:
  • Call setAudioScenario to set the audio scenario to high-quality audio scenario, namely AudioScenarioGameStreaming(3).
  • Call setAudioProfile to set the profile parameter to AudioProfileMusicHighQuality(4) or AudioProfileMusicHighQualityStereo(5).

Restrictions

  • Do not set the profile parameter in setAudioProfile to AudioProfileSpeechStandard(1) or AudioProfileIot(6), or the method does not take effect.
  • If you call setAudioEffectPreset and set enumerators except for RoomAcoustics3dVoice or PitchCorrection, do not call setAudioEffectParameters; otherwise, setAudioEffectPreset is overridden.
  • After calling setAudioEffectPreset, Agora does not recommend you to call the following methods, otherwise the effect set by setAudioEffectPreset will be overwritten:
  • This method relies on the voice beautifier dynamic library libagora_audio_beauty_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

preset
The options for SDK preset audio effects. See AudioEffectPreset.

Returns

  • 0: Success.
  • < 0: Failure.

setAudioMixingDualMonoMode

Sets the channel mode of the current audio file.

abstract setAudioMixingDualMonoMode(mode: AudioMixingDualMonoMode): number;

In a stereo music file, the left and right channels can store different audio data. According to your needs, you can set the channel mode to original mode, left channel mode, right channel mode, or mixed channel mode.

Applicable scenarios

For example, in the KTV scenario, the left channel of the music file stores the musical accompaniment, and the right channel stores the original singer's vocals. You can set according to actual needs:
  • If you only want to hear the accompaniment, use this method to set the audio file's channel mode to left channel mode.
  • If you need to hear both the accompaniment and the original vocals simultaneously, call this method to set the channel mode to mixed mode.

Call timing

Call this method after startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Restrictions

This method only applies to stereo audio files.

Parameters

mode
The channel mode. See AudioMixingDualMonoMode.

Returns

  • 0: Success.
  • < 0: Failure.

setAudioMixingPitch

Sets the pitch of the local music file.

abstract setAudioMixingPitch(pitch: number): number;

When a local music file is mixed with a local human voice, call this method to set the pitch of the local music file only.

Call timing

You need to call this method after calling startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Restrictions

None.

Parameters

pitch
Sets the pitch of the local music file by the chromatic scale. The default value is 0, which means keeping the original pitch. The value ranges from -12 to 12, and the pitch value between consecutive values is a chromatic value. The greater the absolute value of this parameter, the higher or lower the pitch of the local music file.

Returns

  • 0: Success.
  • < 0: Failure.

setAudioMixingPlaybackSpeed

Sets the playback speed of the current audio file.

abstract setAudioMixingPlaybackSpeed(speed: number): number;

Details

Ensure you call this method after calling startAudioMixing receiving the onAudioMixingStateChanged callback reporting the state as AudioMixingStatePlaying.

Parameters

speed
The playback speed. Agora recommends that you set this to a value between 50 and 400, defined as follows:
  • 50: Half the original speed.
  • 100: The original speed.
  • 400: 4 times the original speed.

Returns

  • 0: Success.
  • < 0: Failure.

setAudioMixingPosition

Sets the audio mixing position.

abstract setAudioMixingPosition(pos: number): number;

Call this method to set the playback position of the music file to a different starting position (the default plays from the beginning).

Call timing

Call this method after startAudioMixing and receiving the onAudioMixingStateChanged(AudioMixingStatePlaying) callback.

Restrictions

None.

Parameters

pos
Integer. The playback position (ms).

Returns

  • 0: Success.
  • < 0: Failure.

setAudioProfile

Sets the audio profile and audio scenario.

abstract setAudioProfile(
    profile: AudioProfileType,
    scenario?: AudioScenarioType
  ): number;

Applicable scenarios

This method is suitable for various audio scenarios. You can choose as needed. For example, in scenarios with high audio quality requirements such as music teaching, it is recommended to set profile to AudioProfileMusicHighQuality(4) and scenario to AudioScenarioGameStreaming(3).

Call timing

You can call this method either before or after joining a channel.

Restrictions

Due to iOS system restrictions, some audio routes cannot be recognized in call volume mode. Therefore, if you need to use an external sound card, it is recommended to set the audio scenario to AudioScenarioGameStreaming(3). In this scenario, the SDK will switch to media volume to avoid this issue.

Parameters

profile

The audio profile, including the sampling rate, bitrate, encoding mode, and the number of channels. See AudioProfileType.

scenario
The audio scenarios. Under different audio scenarios, the device uses different volume types. See AudioScenarioType.

Returns

  • 0: Success.
  • < 0: Failure.

setAudioScenario

Sets audio scenarios.

abstract setAudioScenario(scenario: AudioScenarioType): number;

Applicable scenarios

This method is suitable for various audio scenarios. You can choose as needed. For example, in scenarios such as music teaching that require high sound quality, it is recommended to set scenario to AudioScenarioGameStreaming(3).

Call timing

You can call this method either before or after joining a channel.

Restrictions

Due to iOS system restrictions, some audio routes cannot be recognized in call volume mode. Therefore, if you need to use an external sound card, it is recommended to set the audio scenario to AudioScenarioGameStreaming(3). In this scenario, the SDK will switch to media volume to avoid this issue.

Parameters

scenario
The audio scenarios. Under different audio scenarios, the device uses different volume types. See AudioScenarioType.

Returns

  • 0: Success.
  • < 0: Failure.

setAudioSessionOperationRestriction

Sets the operational permission of the SDK on the audio session.

abstract setAudioSessionOperationRestriction(
    restriction: AudioSessionOperationRestriction
  ): number;

Details

The SDK and the app can both configure the audio session by default. If you need to only use the app to configure the audio session, this method restricts the operational permission of the SDK on the audio session.

You can call this method either before or after joining a channel. Once you call this method to restrict the operational permission of the SDK on the audio session, the restriction takes effect when the SDK needs to change the audio session.

Attention:
  • This method is only available for iOS platforms.
  • This method does not restrict the operational permission of the app on the audio session.

Parameters

restriction
The operational permission of the SDK on the audio session. See AudioSessionOperationRestriction. This parameter is in bit mask format, and each bit corresponds to a permission.

Returns

  • 0: Success.
  • < 0: Failure.

setBeautyEffectOptions

Sets the image enhancement options.

abstract setBeautyEffectOptions(
    enabled: boolean,
    options: BeautyOptions,
    type?: MediaSourceType
  ): number;

Enables or disables image enhancement, and sets the options.

Call timing

Call this method after calling enableVideo or startPreview.

Restrictions

  • This method relies on the image enhancement dynamic library libagora_clear_vision_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.
  • This feature has high requirements on device performance. When calling this method, the SDK automatically checks the capabilities of the current device.

Parameters

enabled
Whether to enable the image enhancement function:
  • true: Enable the image enhancement function.
  • false: (Default) Disable the image enhancement function.
options
The image enhancement options. See BeautyOptions.
type
Source type of the extension. See MediaSourceType.

Returns

  • 0: Success.
  • < 0: Failure.
    • -4: The current device does not support this feature. Possible reasons include:
      • The current device capabilities do not meet the requirements for image enhancement. Agora recommends you replace it with a high-performance device.
      • The current device version is lower than Android 5.0 and does not support this feature. Agora recommends you replace the device or upgrade the operating system.

setCameraAutoFocusFaceModeEnabled

Enables the camera auto-face focus function.

abstract setCameraAutoFocusFaceModeEnabled(enabled: boolean): number;

By default, the SDK disables face autofocus on Android and enables face autofocus on iOS. To set face autofocus, call this method.

Call timing

This method must be called after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateEncoding (2).

Restrictions

None.

Parameters

enabled
Whether to enable face autofocus:
  • true: Enable the camera auto-face focus function.
  • false: Disable face autofocus.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraAutoExposureFaceModeEnabled

Sets whether to enable auto exposure.

abstract setCameraAutoExposureFaceModeEnabled(enabled: boolean): number;

Details

Attention:
  • This method applies to iOS only.
  • You must call this method after enableVideo. The setting result will take effect after the camera is successfully turned on, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).

Parameters

enabled
Whether to enable auto exposure:
  • true: Enable auto exposure.
  • false: Disable auto exposure.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraCapturerConfiguration

Sets the camera capture configuration.

abstract setCameraCapturerConfiguration(
    config: CameraCapturerConfiguration
  ): number;

Call timing

Call this method before enabling local camera capture, such as before calling startPreview and joinChannel.

Restrictions

To adjust the camera focal length configuration, It is recommended to call queryCameraFocalLengthCapability first to check the device's focal length capabilities, and then configure based on the query results.

Due to limitations on some Android devices, even if you set the focal length type according to the results returned in queryCameraFocalLengthCapability, the settings may not take effect.

Parameters

config
The camera capture configuration. See CameraCapturerConfiguration.
Attention: In this method, you do not need to set the deviceId parameter.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraDeviceOrientation

Sets the rotation angle of the captured video.

abstract setCameraDeviceOrientation(
    type: VideoSourceType,
    orientation: VideoOrientation
  ): number;

Details

Attention:
  • You must call this method after enableVideo. The setting result will take effect after the camera is successfully turned on, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).
  • When the video capture device does not have the gravity sensing function, you can call this method to manually adjust the rotation angle of the captured video.

Parameters

type
The video source type. See VideoSourceType.
orientation
The clockwise rotation angle. See VideoOrientation.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraExposureFactor

Sets the camera exposure value.

abstract setCameraExposureFactor(factor: number): number;

Details

Insufficient or excessive lighting in the shooting environment can affect the image quality of video capture. To achieve optimal video quality, you can use this method to adjust the camera's exposure value.

Attention:
  • You must call this method after enableVideo. The setting result will take effect after the camera is successfully turned on, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).
  • Before calling this method, Agora recommends calling isCameraExposureSupported to check whether the current camera supports adjusting the exposure value.
  • By calling this method, you adjust the exposure value of the currently active camera, that is, the camera specified when calling setCameraCapturerConfiguration.

Parameters

factor

The camera exposure value. The default value is 0, which means using the default exposure of the camera. The larger the value, the greater the exposure. When the video image is overexposed, you can reduce the exposure value; when the video image is underexposed and the dark details are lost, you can increase the exposure value. If the exposure value you specified is beyond the range supported by the device, the SDK will automatically adjust it to the actual supported range of the device.

On Android, the value range is [-20.0, 20.0]. On iOS, the value range is [-8.0, 8.0].

Returns

  • 0: Success.
  • < 0: Failure.

setCameraExposurePosition

Sets the camera exposure position.

abstract setCameraExposurePosition(
    positionXinView: number,
    positionYinView: number
  ): number;

Details

Attention:
  • You must call this method after enableVideo. The setting result will take effect after the camera is successfully turned on, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).
  • After a successful method call, the SDK triggers the onCameraExposureAreaChanged callback.

Parameters

positionXinView
The horizontal coordinate of the touchpoint in the view.
positionYinView
The vertical coordinate of the touchpoint in the view.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraFocusPositionInPreview

Sets the camera manual focus position.

abstract setCameraFocusPositionInPreview(
    positionX: number,
    positionY: number
  ): number;

Details

Attention:
  • You must call this method after enableVideo. The setting result will take effect after the camera is successfully turned on, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).
  • After a successful method call, the SDK triggers the onCameraFocusAreaChanged callback.

Parameters

positionX
The horizontal coordinate of the touchpoint in the view.
positionY
The vertical coordinate of the touchpoint in the view.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraStabilizationMode

Set the camera stabilization mode.

abstract setCameraStabilizationMode(mode: CameraStabilizationMode): number;
Attention:

This method applies to iOS only.

The camera stabilization mode is off by default. You need to call this method to turn it on and set the appropriate stabilization mode.

Applicable scenarios

When shooting on the move, in low light conditions, or with mobile devices, you can set the camera stabilization mode to reduce the impact of camera shake and get a more stable, clear picture.

Call timing

This method must be called after the camera is successfully enabled, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).

Restrictions

  • Camera stabilization only works for scenarios with a video resolution greater than 1280 x 720.
  • After enabling camera stabilization, the higher the camera stabilization level, the smaller the camera's field of view and the greater the camera's latency. To improve user experience, it is recommended that you set the mode parameter to CameraStabilizationModeLevel1.

Parameters

mode
Camera stabilization mode. See CameraStabilizationMode.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraTorchOn

Enables the camera flash.

abstract setCameraTorchOn(isOn: boolean): number;

Details

Attention:
  • You must call this method after enableVideo. The setting result will take effect after the camera is successfully turned on, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).

Parameters

isOn
Whether to turn on the camera flash:
  • true: Turn on the flash.
  • false: (Default) Turn off the flash.

Returns

  • 0: Success.
  • < 0: Failure.

setCameraZoomFactor

Sets the camera zoom factor.

abstract setCameraZoomFactor(factor: number): number;

Details

For iOS devices equipped with multi-lens rear cameras, such as those featuring dual-camera (wide-angle and ultra-wide-angle) or triple-camera (wide-angle, ultra-wide-angle, and telephoto), you can call setCameraCapturerConfiguration first to set the cameraFocalLengthType as CameraFocalLengthDefault (0) (standard lens). Then, adjust the camera zoom factor to a value less than 1.0. This configuration allows you to capture video with an ultra-wide-angle perspective.

Attention:
  • You must call this method after enableVideo. The setting result will take effect after the camera is successfully turned on, that is, after the SDK triggers the onLocalVideoStateChanged callback and returns the local video state as LocalVideoStreamStateCapturing (1).

Parameters

factor
The camera zoom factor. For devices that do not support ultra-wide-angle, the value ranges from 1.0 to the maximum zoom factor; for devices that support ultra-wide-angle, the value ranges from 0.5 to the maximum zoom factor. You can get the maximum zoom factor supported by the device by calling the getCameraMaxZoomFactor method.

Returns

  • The camera zoom factor value, if successful.
  • < 0: if the method if failed.

setChannelProfile

Sets the channel profile.

abstract setChannelProfile(profile: ChannelProfileType): number;

You can call this method to set the channel profile. The SDK adopts different optimization strategies for different channel profiles. For example, in a live streaming scenario, the SDK prioritizes video quality. After initializing the SDK, the default channel profile is the live streaming profile.

Attention:

In different channel scenarios, the default audio routing of the SDK is different. See setDefaultAudioRouteToSpeakerphone.

Call timing

Call this method before joining a channel.

Restrictions

To ensure the quality of real-time communication, Agora recommends that all users in a channel use the same channel profile.

Parameters

profile

The channel profile. See ChannelProfileType.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The parameter is invalid.
    • -7: The SDK is not initialized.

setCloudProxy

Sets up cloud proxy service.

abstract setCloudProxy(proxyType: CloudProxyType): number;

Details

When users' network access is restricted by a firewall, configure the firewall to allow specific IP addresses and ports provided by Agora; then, call this method to enable the cloud proxyType and set the cloud proxy type with the proxyType parameter.

After successfully connecting to the cloud proxy, the SDK triggers the onConnectionStateChanged (ConnectionStateConnecting, ConnectionChangedSettingProxyServer) callback.

To disable the cloud proxy that has been set, call the setCloudProxy(NoneProxy).

To change the cloud proxy type that has been set, call the setCloudProxy(NoneProxy) first, and then call the setCloudProxy to set the proxyType you want.

Attention:
  • Agora recommends that you call this method after joining a channel.
  • When a user is behind a firewall and uses the Force UDP cloud proxy, the services for Media Push and cohosting across channels are not available.
  • When you use the Force TCP cloud proxy, note that an error would occur when calling the startAudioMixing method to play online music files in the HTTP protocol. The services for Media Push and cohosting across channels use the cloud proxy with the TCP protocol.

Parameters

proxyType

The type of the cloud proxy. See CloudProxyType.

This parameter is mandatory. The SDK reports an error if you do not pass in a value.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The parameter is invalid.
    • -7: The SDK is not initialized.

setClientRole

Set the user role and the audience latency level in a live streaming scenario.

abstract setClientRole(
    role: ClientRoleType,
    options?: ClientRoleOptions
  ): number;

By default,the SDK sets the user role as audience. You can call this method to set the user role as host. The user role (roles) determines the users' permissions at the SDK level, including whether they can publish audio and video streams in a channel.

Call timing

You can call this method either before or after joining a channel.

If you call this method to set the user role after joining a channel, the SDK will automatically call the muteLocalAudioStream and muteLocalVideoStream method to change the state for publishing audio and video streams.

Restrictions

When the user role is set to host, the audience latency level can only be set to AudienceLatencyLevelUltraLowLatency.

When calling this method before joining a channel and setting the role to BROADCASTER, the onClientRoleChanged callback will not be triggered on the local client.

Parameters

role
The user role. See ClientRoleType.
Note: If you set the user role as an audience member, you cannot publish audio and video streams in the channel. If you want to publish media streams in a channel during live streaming, ensure you set the user role as broadcaster.
options
The detailed options of a user, including the user level. See ClientRoleOptions.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).
    • -2: The parameter is invalid.
    • -5: The request is rejected.
    • -7: The SDK is not initialized.

setColorEnhanceOptions

Sets color enhancement.

abstract setColorEnhanceOptions(
    enabled: boolean,
    options: ColorEnhanceOptions,
    type?: MediaSourceType
  ): number;

Details

The video images captured by the camera can have color distortion. The color enhancement feature intelligently adjusts video characteristics such as saturation and contrast to enhance the video color richness and color reproduction, making the video more vivid.

You can call this method to enable the color enhancement feature and set the options of the color enhancement effect.

Attention:
  • Call this method after calling enableVideo.
  • The color enhancement feature has certain performance requirements on devices. With color enhancement turned on, Agora recommends that you change the color enhancement level to one that consumes less performance or turn off color enhancement if your device is experiencing severe heat problems.
  • Both this method and setExtensionProperty can enable color enhancement:
    • When you use the SDK to capture video, Agora recommends this method (this method only works for video captured by the SDK).
    • When you use an external video source to implement custom video capture, or send an external video source to the SDK, Agora recommends using setExtensionProperty.
  • This method relies on the image enhancement dynamic library libagora_clear_vision_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

enabled
Whether to enable color enhancement:
  • true Enable color enhancement.
  • false: (Default) Disable color enhancement.
options
The color enhancement options. See ColorEnhanceOptions.
type
The type of the video source. See MediaSourceType.

Returns

  • 0: Success.
  • < 0: Failure.

setDefaultAudioRouteToSpeakerphone

Sets the default audio playback route.

abstract setDefaultAudioRouteToSpeakerphone(
    defaultToSpeaker: boolean
  ): number;

Most mobile phones have two audio routes: an earpiece at the top, and a speakerphone at the bottom. The earpiece plays at a lower volume, and the speakerphone at a higher volume. When setting the default audio route, you determine whether audio playback comes through the earpiece or speakerphone when no external audio device is connected.

In different scenarios, the default audio routing of the system is also different. See the following:
  • Voice call: Earpiece.
  • Audio broadcast: Speakerphone.
  • Video call: Speakerphone.
  • Video broadcast: Speakerphone.

You can call this method to change the default audio route.

Note:

After calling this method to set the default audio route, the actual audio route of the system will change with the connection of external audio devices (wired headphones or Bluetooth headphones). See .

Call timing

Call this method before joining a channel. If you need to change the audio route after joining a channel, call setEnableSpeakerphone.

Restrictions

None.

Parameters

defaultToSpeaker
Whether to set the speakerphone as the default audio route:
  • true: Set the speakerphone as the default audio route.
  • false: Set the earpiece as the default audio route.

Returns

  • 0: Success.
  • < 0: Failure.

setDirectCdnStreamingAudioConfiguration

Sets the audio profile of the audio streams directly pushed to the CDN by the host.

abstract setDirectCdnStreamingAudioConfiguration(
    profile: AudioProfileType
  ): number;

When you set the publishMicrophoneTrack or publishCustomAudioTrack in the DirectCdnStreamingMediaOptions as true to capture audios, you can call this method to set the audio profile.

Parameters

profile

The audio profile, including the sampling rate, bitrate, encoding mode, and the number of channels. See AudioProfileType.

Returns

  • 0: Success.
  • < 0: Failure.

setDirectCdnStreamingVideoConfiguration

Sets the video profile of the media streams directly pushed to the CDN by the host.

abstract setDirectCdnStreamingVideoConfiguration(
    config: VideoEncoderConfiguration
  ): number;

Details

This method only affects video streams captured by cameras or screens, or from custom video capture sources. That is, when you set publishCameraTrack or publishCustomVideoTrack in DirectCdnStreamingMediaOptions as true to capture videos, you can call this method to set the video profiles.

If your local camera does not support the video resolution you set,the SDK automatically adjusts the video resolution to a value that is closest to your settings for capture, encoding or streaming, with the same aspect ratio as the resolution you set. You can get the actual resolution of the video streams through the onDirectCdnStreamingStats callback.

Parameters

config
Video profile. See VideoEncoderConfiguration.
Note: During CDN live streaming, Agora only supports setting OrientationMode as OrientationFixedLandscape or OrientationFixedPortrait.

Returns

  • 0: Success.
  • < 0: Failure.

setDualStreamMode

Sets dual-stream mode configuration on the sender side.

abstract setDualStreamMode(
    mode: SimulcastStreamMode,
    streamConfig?: SimulcastStreamConfig
  ): number;

Details

The SDK defaults to enabling low-quality video stream adaptive mode (AutoSimulcastStream) on the sender side, which means the sender does not actively send low-quality video stream. The receiving end with the role of the host can initiate a low-quality video stream request by calling setRemoteVideoStreamType, and upon receiving the request, the sending end automatically starts sending low-quality stream.
  • If you want to modify this behavior, you can call this method and set mode to DisableSimulcastStream (never send low-quality video streams) or EnableSimulcastStream (always send low-quality video streams).
  • If you want to restore the default behavior after making changes, you can call this method again with mode set to AutoSimulcastStream.
Note: The difference and connection between this method and enableDualStreamMode is as follows:
  • When calling this method and setting mode to DisableSimulcastStream, it has the same effect as calling enableDualStreamMode and setting enabled to false.
  • When calling this method and setting mode to EnableSimulcastStream, it has the same effect as calling enableDualStreamMode and setting enabled to true.
  • Both methods can be called before and after joining a channel. If both methods are used, the settings in the method called later takes precedence.

Parameters

mode
The mode in which the video stream is sent. See SimulcastStreamMode.
streamConfig
The configuration of the low-quality video stream. See SimulcastStreamConfig.
Note: When setting mode to DisableSimulcastStream, setting streamConfig will not take effect.

Returns

  • 0: Success.
  • < 0: Failure.

setEarMonitoringAudioFrameParameters

Sets the format of the in-ear monitoring raw audio data.

abstract setEarMonitoringAudioFrameParameters(
    sampleRate: number,
    channel: number,
    mode: RawAudioFrameOpModeType,
    samplesPerCall: number
  ): number;

Details

This method is used to set the in-ear monitoring audio data format reported by the onEarMonitoringAudioFrame callback.

Attention:
  • Before calling this method, you need to call enableInEarMonitoring, and set includeAudioFilters to EarMonitoringFilterBuiltInAudioFilters or EarMonitoringFilterNoiseSuppression.
  • The SDK calculates the sampling interval based on the samplesPerCall, sampleRate and channel parameters set in this method.Sample interval (sec) = samplePerCall/(sampleRate × channel). Ensure that the sample interval ≥ 0.01 (s). The SDK triggers the onEarMonitoringAudioFrame callback according to the sampling interval.

Parameters

sampleRate
The sample rate of the audio data reported in the onEarMonitoringAudioFrame callback, which can be set as 8,000, 16,000, 32,000, 44,100, or 48,000 Hz.
channel
The number of audio channels reported in the onEarMonitoringAudioFrame callback.
  • 1: Mono.
  • 2: Stereo.
mode

The use mode of the audio frame. See RawAudioFrameOpModeType.

samplesPerCall
The number of data samples reported in the onEarMonitoringAudioFrame callback, such as 1,024 for the Media Push.

Returns

  • 0: Success.
  • < 0: Failure.

setEffectPosition

Sets the playback position of an audio effect file.

abstract setEffectPosition(soundId: number, pos: number): number;

Details

After a successful setting, the local audio effect file starts playing at the specified position.

Attention: Call this method after playEffect.

Parameters

soundId
The audio effect ID. The ID of each audio effect file is unique.
pos
The playback position (ms) of the audio effect file.

Returns

  • 0: Success.
  • < 0: Failure.

setEffectsVolume

Sets the volume of the audio effects.

abstract setEffectsVolume(volume: number): number;

Call timing

Call this method after playEffect.

Restrictions

None.

Parameters

volume
The playback volume. The value range is [0, 100]. The default value is 100, which represents the original volume.

Returns

  • 0: Success.
  • < 0: Failure.

setEnableSpeakerphone

Enables/Disables the audio route to the speakerphone.

abstract setEnableSpeakerphone(speakerOn: boolean): number;

For the default audio route in different scenarios, see .

Applicable scenarios

If the default audio route of the SDK or the setting in setDefaultAudioRouteToSpeakerphone cannot meet your requirements, you can call this method to switch the current audio route.

Call timing

Call this method after joining a channel.

Restrictions

  • This method only sets the audio route in the current channel and does not influence the default audio route. If the user leaves the current channel and joins another channel, the default audio route is used.
  • If the user uses an external audio playback device such as a Bluetooth or wired headset, this method does not take effect, and the SDK plays audio through the external device. When the user uses multiple external devices, the SDK plays audio through the last connected device.

Parameters

speakerOn
Sets whether to enable the speakerphone or earpiece:
  • true: Enable device state monitoring. The audio route is the speakerphone.
  • false: Disable device state monitoring. The audio route is the earpiece.

Returns

  • 0: Success.
  • < 0: Failure.

setExtensionProperty

Sets the properties of the extension.

abstract setExtensionProperty(
    provider: string,
    extension: string,
    key: string,
    value: string,
    type?: MediaSourceType
  ): number;

After enabling the extension, you can call this method to set the properties of the extension.

Call timing

Call this mehtod after calling enableExtension.

Restrictions

If you want to set properties for multiple extensions, you need to call this method multiple times.

Parameters

provider
The name of the extension provider.
extension
The name of the extension.
key
The key of the extension.
value
The value of the extension key.
type
Source type of the extension. See MediaSourceType.

Returns

  • 0: Success.
  • < 0: Failure.

setExtensionProviderProperty

Sets the properties of the extension provider.

abstract setExtensionProviderProperty(
    provider: string,
    key: string,
    value: string
  ): number;

You can call this method to set the attributes of the extension provider and initialize the relevant parameters according to the type of the provider.

Call timing

Call this method before enableExtension and after registerExtension.

Restrictions

If you want to set the properties of the extension provider for multiple extensions, you need to call this method multiple times.

Parameters

provider
The name of the extension provider.
key
The key of the extension.
value
The value of the extension key.

Returns

  • 0: Success.
  • < 0: Failure.

setExternalAudioSink

Sets the external audio sink.

abstract setExternalAudioSink(
    enabled: boolean,
    sampleRate: number,
    channels: number
  ): number;

After enabling the external audio sink, you can call pullAudioFrame to pull remote audio frames. The app can process the remote audio and play it with the audio effects that you want.

Applicable scenarios

This method applies to scenarios where you want to use external audio data for playback.

Call timing

Call this method before joining a channel.

Restrictions

Once you enable the external audio sink, the app will not retrieve any audio data from the onPlaybackAudioFrame callback.

Parameters

enabled
Whether to enable or disable the external audio sink:
  • true: Enables the external audio sink.
  • false: (Default) Disables the external audio sink.
sampleRate
The sample rate (Hz) of the external audio sink, which can be set as 16000, 32000, 44100, or 48000.
channels
The number of audio channels of the external audio sink:
  • 1: Mono.
  • 2: Stereo.

Returns

  • 0: Success.
  • < 0: Failure.

setHeadphoneEQPreset

Sets the preset headphone equalization effect.

abstract setHeadphoneEQPreset(preset: HeadphoneEqualizerPreset): number;

Details

This method is mainly used in spatial audio effect scenarios. You can select the preset headphone equalizer to listen to the audio to achieve the expected audio experience.

Note: If the headphones you use already have a good equalization effect, you may not get a significant improvement when you call this method, and could even diminish the experience.

Parameters

preset
The preset headphone equalization effect. See HeadphoneEqualizerPreset.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).

setHeadphoneEQParameters

Sets the low- and high-frequency parameters of the headphone equalizer.

abstract setHeadphoneEQParameters(lowGain: number, highGain: number): number;

Details

In a spatial audio effect scenario, if the preset headphone equalization effect is not achieved after calling the setHeadphoneEQPreset method, you can further adjust the headphone equalization effect by calling this method.

Parameters

lowGain
The low-frequency parameters of the headphone equalizer. The value range is [-10,10]. The larger the value, the deeper the sound.
highGain
The high-frequency parameters of the headphone equalizer. The value range is [-10,10]. The larger the value, the sharper the sound.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).

setInEarMonitoringVolume

Sets the volume of the in-ear monitor.

abstract setInEarMonitoringVolume(volume: number): number;

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

volume
The volume of the user. The value range is [0,400].
  • 0: Mute.
  • 100: (Default) The original volume.
  • 400: Four times the original volume (amplifying the audio signals by four times).

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: Invalid parameter settings, such as in-ear monitoring volume exceeding the valid range (< 0 or > 400).

setLocalRenderMode

Updates the display mode of the local video view.

abstract setLocalRenderMode(
    renderMode: RenderModeType,
    mirrorMode?: VideoMirrorModeType
  ): number;

After initializing the local video view, you can call this method to update its rendering and mirror modes. It affects only the video view that the local user sees and does not impact the publishing of the local video.

Call timing

  • During a call, you can call this method as many times as necessary to update the display mode of the local video view.

Restrictions

None.

Parameters

renderMode

The local video display mode. See RenderModeType.

mirrorMode

The mirror mode of the local video view. See VideoMirrorModeType.

Attention: If you use a front camera, the SDK enables the mirror mode by default; if you use a rear camera, the SDK disables the mirror mode by default.

Returns

  • 0: Success.
  • < 0: Failure.

setLocalVideoMirrorMode

Sets the local video mirror mode.

abstract setLocalVideoMirrorMode(mirrorMode: VideoMirrorModeType): number;

Details

Deprecated:
This method is deprecated.
Use setLocalRenderMode instead.

Parameters

mirrorMode

The local video mirror mode. See VideoMirrorModeType.

Returns

  • 0: Success.
  • < 0: Failure.

setLocalVoiceEqualization

Sets the local voice equalization effect.

abstract setLocalVoiceEqualization(
    bandFrequency: AudioEqualizationBandFrequency,
    bandGain: number
  ): number;

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

bandFrequency
The band frequency. The value ranges between 0 and 9; representing the respective 10-band center frequencies of the voice effects, including 31, 62, 125, 250, 500, 1k, 2k, 4k, 8k, and 16k Hz. See AudioEqualizationBandFrequency.
bandGain
The gain of each band in dB. The value ranges between -15 and 15. The default value is 0.

Returns

  • 0: Success.
  • < 0: Failure.

setLocalVoiceFormant

Set the formant ratio to change the timbre of human voice.

abstract setLocalVoiceFormant(formantRatio: number): number;

Formant ratio affects the timbre of voice. The smaller the value, the deeper the sound will be, and the larger, the sharper. After you set the formant ratio, all users in the channel can hear the changed voice. If you want to change the timbre and pitch of voice at the same time, Agora recommends using this method together with setLocalVoicePitch.

Applicable scenarios

You can call this method to set the formant ratio of local audio to change the timbre of human voice.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

formantRatio
The formant ratio. The value range is [-1.0, 1.0]. The default value is 0.0, which means do not change the timbre of the voice.
Note: Agora recommends setting this value within the range of [-0.4, 0.6]. Otherwise, the voice may be seriously distorted.

Returns

  • 0: Success.
  • < 0: Failure.

setLocalVoicePitch

Changes the voice pitch of the local speaker.

abstract setLocalVoicePitch(pitch: number): number;

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

pitch
The local voice pitch. The value range is [0.5,2.0]. The lower the value, the lower the pitch. The default value is 1.0 (no change to the pitch).

Returns

  • 0: Success.
  • < 0: Failure.

setLocalVoiceReverb

Sets the local voice reverberation.

abstract setLocalVoiceReverb(
    reverbKey: AudioReverbType,
    value: number
  ): number;

Details

The SDK provides an easier-to-use method, setAudioEffectPreset, to directly implement preset reverb effects for such as pop, R&B, and KTV.

Note: You can call this method either before or after joining a channel.

Parameters

reverbKey
The reverberation key. Agora provides five reverberation keys, see AudioReverbType.
value
The value of the reverberation key.

Returns

  • 0: Success.
  • < 0: Failure.

setLogFile

Sets the log file.

abstract setLogFile(filePath: string): number;
Deprecated:
This method is deprecated. Set the log file path by configuring the context parameter when calling initialize.

Specifies an SDK output log file. The log file records all log data for the SDK’s operation.

Call timing

This method needs to be called immediately after initialize, otherwise the output log may be incomplete.

Restrictions

Ensure that the directory for the log file exists and is writable.

Parameters

filePath
The complete path of the log files. These log files are encoded in UTF-8.

Returns

  • 0: Success.
  • < 0: Failure.

setLogFileSize

Sets the log file size.

abstract setLogFileSize(fileSizeInKBytes: number): number;

Details

Deprecated:
Use the logConfig parameter in initialize instead.

By default, the SDK generates five SDK log files and five API call log files with the following rules:

  • The SDK log files are: agorasdk.log, agorasdk.1.log, agorasdk.2.log, agorasdk.3.log, and agorasdk.4.log.
  • The API call log files are: agoraapi.log, agoraapi.1.log, agoraapi.2.log, agoraapi.3.log, and agoraapi.4.log.
  • The default size of each SDK log file and API log file is 2,048 KB. These log files are encoded in UTF-8.
  • The SDK writes the latest logs in agorasdk.log or agoraapi.log.
  • When agorasdk.log is full, the SDK processes the log files in the following order:
    1. Delete the agorasdk.4.log file (if any).
    2. Rename agorasdk.3.log to agorasdk.4.log.
    3. Rename agorasdk.2.log to agorasdk.3.log.
    4. Rename agorasdk.1.log to agorasdk.2.log.
    5. Create a new agorasdk.log file.
  • The overwrite rules for the agoraapi.log file are the same as for agorasdk.log.
Note:

This method is used to set the size of the agorasdk.log file only and does not effect the agoraapi.log file.

Parameters

fileSizeInKBytes
The size (KB) of an agorasdk.log file. The value range is [128,20480]. The default value is 2,048 KB. If you set fileSizeInKByte smaller than 128 KB, the SDK automatically adjusts it to 128 KB; if you set fileSizeInKByte greater than 20,480 KB, the SDK automatically adjusts it to 20,480 KB.

Returns

  • 0: Success.
  • < 0: Failure.

setLogFilter

Sets the log output level of the SDK.

abstract setLogFilter(filter: LogFilterType): number;

Details

Deprecated:
Use logConfig in initialize instead.

This method sets the output log level of the SDK. You can use one or a combination of the log filter levels. The log level follows the sequence of LogFilterOff, LogFilterCritical, LogFilterError, LogFilterWarn, LogFilterInfo, and LogFilterDebug. Choose a level to see the logs preceding that level.

If, for example, you set the log level to LogFilterWarn, you see the logs within levels LogFilterCritical, LogFilterError and LogFilterWarn.

Parameters

filter

The output log level of the SDK. See LogFilterType.

Returns

  • 0: Success.
  • < 0: Failure.

setLogLevel

Sets the output log level of the SDK.

abstract setLogLevel(level: LogLevel): number;
Deprecated:
This method is deprecated. Set the log file level by configuring the context parameter when calling initialize.

Choose a level to see the logs preceding that level.

Parameters

level
The log level. See LogLevel.

Returns

  • 0: Success.
  • < 0: Failure.

setMaxMetadataSize

Sets the maximum size of the media metadata.

abstract setMaxMetadataSize(size: number): number;

Details

After calling registerMediaMetadataObserver, you can call this method to set the maximum size of the media metadata.

Parameters

size
The maximum size of media metadata.

Returns

  • 0: Success.
  • < 0: Failure.

setLowlightEnhanceOptions

Sets low-light enhancement.

abstract setLowlightEnhanceOptions(
    enabled: boolean,
    options: LowlightEnhanceOptions,
    type?: MediaSourceType
  ): number;

Details

The low-light enhancement feature can adaptively adjust the brightness value of the video captured in situations with low or uneven lighting, such as backlit, cloudy, or dark scenes. It restores or highlights the image details and improves the overall visual effect of the video.

You can call this method to enable the color enhancement feature and set the options of the color enhancement effect.

Attention:
  • Call this method after calling enableVideo.
  • Dark light enhancement has certain requirements for equipment performance. The low-light enhancement feature has certain performance requirements on devices. If your device overheats after you enable low-light enhancement, Agora recommends modifying the low-light enhancement options to a less performance-consuming level or disabling low-light enhancement entirely.
  • Both this method and setExtensionProperty can turn on low-light enhancement:
    • When you use the SDK to capture video, Agora recommends this method (this method only works for video captured by the SDK).
    • When you use an external video source to implement custom video capture, or send an external video source to the SDK, Agora recommends using setExtensionProperty.
  • This method relies on the image enhancement dynamic library libagora_clear_vision_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

enabled
Whether to enable low-light enhancement:
  • true: Enable low-light enhancement.
  • false: (Default) Disable low-light enhancement.
options
The low-light enhancement options. See LowlightEnhanceOptions.
type
The type of the video source. See MediaSourceType.

Returns

  • 0: Success.
  • < 0: Failure.

setMixedAudioFrameParameters

Set the format of the raw audio data after mixing for audio capture and playback.

abstract setMixedAudioFrameParameters(
    sampleRate: number,
    channel: number,
    samplesPerCall: number
  ): number;

The SDK calculates the sampling interval based on the samplesPerCall, sampleRate and channel parameters set in this method.Sample interval (sec) = samplePerCall/(sampleRate × channel). Ensure that the sample interval ≥ 0.01 (s). The SDK triggers the onMixedAudioFrame callback according to the sampling interval.

Call timing

Call this method before joining a channel.

Restrictions

None.

Parameters

sampleRate
The sample rate returned in the callback, which can be set as 8000, 16000, 32000, 44100, or 48000 Hz.
channel
The number of audio channels. You can set the value as 1 or 2.
  • 1: Mono.
  • 2: Stereo.
samplesPerCall
The number of data samples, such as 1024 for the Media Push.

Returns

  • 0: Success.
  • < 0: Failure.

setPlaybackAudioFrameBeforeMixingParameters

Sets the format of the raw audio playback data before mixing.

abstract setPlaybackAudioFrameBeforeMixingParameters(
    sampleRate: number,
    channel: number
  ): number;

The SDK triggers the onPlaybackAudioFrameBeforeMixing callback according to the sampling interval.

Call timing

Call this method before joining a channel.

Restrictions

None.

Parameters

sampleRate
The sample rate returned in the callback, which can be set as 8000, 16000, 32000, 44100, or 48000 Hz.
channel
The number of audio channels. You can set the value as 1 or 2.
  • 1: Mono.
  • 2: Stereo.

Returns

  • 0: Success.
  • < 0: Failure.

setPlaybackAudioFrameParameters

Sets the format of the raw audio playback data.

abstract setPlaybackAudioFrameParameters(
    sampleRate: number,
    channel: number,
    mode: RawAudioFrameOpModeType,
    samplesPerCall: number
  ): number;

The SDK calculates the sampling interval based on the samplesPerCall, sampleRate and channel parameters set in this method.Sample interval (sec) = samplePerCall/(sampleRate × channel). Ensure that the sample interval ≥ 0.01 (s). The SDK triggers the onPlaybackAudioFrame callback according to the sampling interval.

Call timing

Call this method before joining a channel.

Restrictions

None.

Parameters

sampleRate
The sample rate returned in the callback, which can be set as 8000, 16000, 32000, 44100, or 48000 Hz.
channel
The number of audio channels. You can set the value as 1 or 2.
  • 1: Mono.
  • 2: Stereo.
mode

The use mode of the audio frame. See RawAudioFrameOpModeType.

samplesPerCall
The number of data samples, such as 1024 for the Media Push.

Returns

  • 0: Success.
  • < 0: Failure.

setRecordingAudioFrameParameters

Sets the format of the captured raw audio data.

abstract setRecordingAudioFrameParameters(
    sampleRate: number,
    channel: number,
    mode: RawAudioFrameOpModeType,
    samplesPerCall: number
  ): number;

The SDK calculates the sampling interval based on the samplesPerCall, sampleRate and channel parameters set in this method.Sample interval (sec) = samplePerCall/(sampleRate × channel). Ensure that the sample interval ≥ 0.01 (s). The SDK triggers the onRecordAudioFrame callback according to the sampling interval.

Call timing

Call this method before joining a channel.

Restrictions

None.

Parameters

sampleRate
The sample rate returned in the callback, which can be set as 8000, 16000, 32000, 44100, or 48000 Hz.
channel
The number of audio channels. You can set the value as 1 or 2.
  • 1: Mono.
  • 2: Stereo.
mode

The use mode of the audio frame. See RawAudioFrameOpModeType.

samplesPerCall
The number of data samples, such as 1024 for the Media Push.

Returns

  • 0: Success.
  • < 0: Failure.

setParameters

Provides technical preview functionalities or special customizations by configuring the SDK with JSON options.

abstract setParameters(parameters: string): number;

Parameters

parameters
Pointer to the set parameters in a JSON string.

Returns

  • 0: Success.
  • < 0: Failure.

setRemoteDefaultVideoStreamType

Sets the default video stream type to subscribe to.

abstract setRemoteDefaultVideoStreamType(streamType: VideoStreamType): number;
Depending on the default behavior of the sender and the specific settings when calling setDualStreamMode, the scenarios for the receiver calling this method are as follows:
  • The SDK enables low-quality video stream adaptive mode (AutoSimulcastStream) on the sender side by default, meaning only the high-quality video stream is transmitted. Only the receiver with the role of the host can call this method to initiate a low-quality video stream request. Once the sender receives the request, it starts automatically sending the low-quality video stream. At this point, all users in the channel can call this method to switch to low-quality video stream subscription mode.
  • If the sender calls setDualStreamMode and sets mode to DisableSimulcastStream (never send low-quality video stream), then calling this method will have no effect.
  • If the sender calls setDualStreamMode and sets mode to EnableSimulcastStream (always send low-quality video stream), both the host and audience receivers can call this method to switch to low-quality video stream subscription mode.

The SDK will dynamically adjust the size of the corresponding video stream based on the size of the video window to save bandwidth and computing resources. The default aspect ratio of the low-quality video stream is the same as that of the high-quality video stream. According to the current aspect ratio of the high-quality video stream, the system will automatically allocate the resolution, frame rate, and bitrate of the low-quality video stream.

Call timing

Call this method before joining a channel. The SDK does not support changing the default subscribed video stream type after joining a channel.

Restrictions

If you call both this method and setRemoteVideoStreamType, the setting of setRemoteVideoStreamType takes effect.

Parameters

streamType

The default video-stream type. See VideoStreamType.

Returns

  • 0: Success.
  • < 0: Failure.

setRemoteUserSpatialAudioParams

Sets the spatial audio effect parameters of the remote user.

abstract setRemoteUserSpatialAudioParams(
    uid: number,
    params: SpatialAudioParams
  ): number;

Details

Call this method after enableSpatialAudio. After successfully setting the spatial audio effect parameters of the remote user, the local user can hear the remote user with a sense of space.

Parameters

uid
The user ID. This parameter must be the same as the user ID passed in when the user joined the channel.
The spatial audio parameters. See SpatialAudioParams.

Returns

  • 0: Success.
  • < 0: Failure.

setRouteInCommunicationMode

Selects the audio playback route in communication audio mode.

abstract setRouteInCommunicationMode(route: number): number;

This method is used to switch the audio route from Bluetooth headphones to earpiece, wired headphones or speakers in communication audio mode ().

Attention: This method is for Android only.

Call timing

This method can be called either before or after joining the channel.

Restrictions

Using this method and the setEnableSpeakerphone method at the same time may cause conflicts. Agora recommends that you use the setRouteInCommunicationMode method alone.

Parameters

route
The audio playback route you want to use:
  • -1: The default audio route.
  • 0: Headphones with microphone.
  • 1: Handset.
  • 2: Headphones without microphone.
  • 3: Device's built-in speaker.
  • 4: (Not supported yet) External speakers.
  • 5: Bluetooth headphones.
  • 6: USB device.

Returns

Without practical meaning.

setRemoteRenderMode

Updates the display mode of the video view of a remote user.

abstract setRemoteRenderMode(
    uid: number,
    renderMode: RenderModeType,
    mirrorMode: VideoMirrorModeType
  ): number;

Details

After initializing the video view of a remote user, you can call this method to update its rendering and mirror modes. This method affects only the video view that the local user sees.

Attention:
  • During a call, you can call this method as many times as necessary to update the display mode of the video view of a remote user.

Parameters

uid
The user ID of the remote user.
renderMode

The rendering mode of the remote user view. For details, see RenderModeType.

mirrorMode

The mirror mode of the remote user view. See VideoMirrorModeType.

Returns

  • 0: Success.
  • < 0: Failure.

setRemoteSubscribeFallbackOption

Sets the fallback option for the subscribed video stream based on the network conditions.

abstract setRemoteSubscribeFallbackOption(
    option: StreamFallbackOptions
  ): number;

Details

An unstable network affects the audio and video quality in a video call or interactive live video streaming. If option is set as StreamFallbackOptionVideoStreamLow or StreamFallbackOptionAudioOnly, the SDK automatically switches the video from a high-quality stream to a low-quality stream or disables the video when the downlink network conditions cannot support both audio and video to guarantee the quality of the audio. Meanwhile, the SDK continuously monitors network quality and resumes subscribing to audio and video streams when the network quality improves.

When the subscribed video stream falls back to an audio-only stream, or recovers from an audio-only stream to an audio-video stream, the SDK triggers the onRemoteSubscribeFallbackToAudioOnly callback.

Parameters

option
Fallback options for the subscribed stream. See STREAM_FALLBACK_OPTIONS.

Returns

  • 0: Success.
  • < 0: Failure.

setRemoteVideoStreamType

Sets the video stream type to subscribe to.

abstract setRemoteVideoStreamType(
    uid: number,
    streamType: VideoStreamType
  ): number;

Details

Depending on the default behavior of the sender and the specific settings when calling setDualStreamMode, the scenarios for the receiver calling this method are as follows:
  • The SDK enables low-quality video stream adaptive mode (AutoSimulcastStream) on the sender side by default, meaning only the high-quality video stream is transmitted. Only the receiver with the role of the host can call this method to initiate a low-quality video stream request. Once the sender receives the request, it starts automatically sending the low-quality video stream. At this point, all users in the channel can call this method to switch to low-quality video stream subscription mode.
  • If the sender calls setDualStreamMode and sets mode to DisableSimulcastStream (never send low-quality video stream), then calling this method will have no effect.
  • If the sender calls setDualStreamMode and sets mode to EnableSimulcastStream (always send low-quality video stream), both the host and audience receivers can call this method to switch to low-quality video stream subscription mode.

The SDK will dynamically adjust the size of the corresponding video stream based on the size of the video window to save bandwidth and computing resources. The default aspect ratio of the low-quality video stream is the same as that of the high-quality video stream. According to the current aspect ratio of the high-quality video stream, the system will automatically allocate the resolution, frame rate, and bitrate of the low-quality video stream.

Attention:
  • You can call this method either before or after joining a channel.
  • If you call both this method and setRemoteDefaultVideoStreamType, the setting of this method takes effect.

Parameters

uid
The user ID.
streamType

The video stream type, see VideoStreamType.

Returns

  • 0: Success.
  • < 0: Failure.

setRemoteVideoSubscriptionOptions

Options for subscribing to remote video streams.

abstract setRemoteVideoSubscriptionOptions(
    uid: number,
    options: VideoSubscriptionOptions
  ): number;

Details

When a remote user has enabled dual-stream mode, you can call this method to choose the option for subscribing to the video streams sent by the remote user.

  • If you only register one IVideoFrameObserver object, the SDK subscribes to the raw video data and encoded video data by default (the effect is equivalent to setting encodedFrameOnly to false).
  • If you only register one IVideoEncodedFrameObserver object, the SDK only subscribes to the encoded video data by default (the effect is equivalent to setting encodedFrameOnly to true).
  • If you register one IVideoFrameObserver object and one IVideoEncodedFrameObserver object successively, the SDK subscribes to the encoded video data by default (the effect is equivalent to setting encodedFrameOnly to false).
  • If you call this method first with the options parameter set, and then register one IVideoFrameObserver or IVideoEncodedFrameObserver object, you need to call this method again and set the options parameter as described in the above two items to get the desired results.
Note: Agora recommends the following steps:
  1. Set autoSubscribeVideo to false when calling joinChannel to join a channel.
  2. Call this method after receiving the onUserJoined callback to set the subscription options for the specified remote user's video stream.
  3. Call the muteRemoteVideoStream method to resume subscribing to the video stream of the specified remote user. If you set encodedFrameOnly to true in the previous step, the SDK triggers the onEncodedVideoFrameReceived callback locally to report the received encoded video frame information.

Parameters

uid
The user ID of the remote user.
options
The video subscription options. See VideoSubscriptionOptions.

Returns

  • 0: Success.
  • < 0: Failure.

setRemoteVoicePosition

Sets the 2D position (the position on the horizontal plane) of the remote user's voice.

abstract setRemoteVoicePosition(
    uid: number,
    pan: number,
    gain: number
  ): number;

Details

This method sets the 2D position and volume of a remote user, so that the local user can easily hear and identify the remote user's position.

When the local user calls this method to set the voice position of a remote user, the voice difference between the left and right channels allows the local user to track the real-time position of the remote user, creating a sense of space. This method applies to massive multiplayer online games, such as Battle Royale games.

Attention:
  • For this method to work, enable stereo panning for remote users by calling the enableSoundPositionIndication method before joining a channel.
  • For the best voice positioning, Agora recommends using a wired headset.
  • Call this method after joining a channel.

Parameters

uid
The user ID of the remote user.
pan
The voice position of the remote user. The value ranges from -1.0 to 1.0:
  • 0.0: (Default) The remote voice comes from the front.
  • -1.0: The remote voice comes from the left.
  • 1.0: The remote voice comes from the right.
gain
The volume of the remote user. The value ranges from 0.0 to 100.0. The default value is 100.0 (the original volume of the remote user). The smaller the value, the lower the volume.

Returns

  • 0: Success.
  • < 0: Failure.

setScreenCaptureContentHint

Sets the content hint for screen sharing.

abstract setScreenCaptureContentHint(contentHint: VideoContentHint): number;

Details

A content hint suggests the type of the content being shared, so that the SDK applies different optimization algorithms to different types of content. If you don't call this method, the default content hint is ContentHintNone.

Attention: You can call this method either before or after you start screen sharing.

Parameters

contentHint
The content hint for screen sharing. See VideoContentHint.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The parameter is invalid.
    • -8: The screen sharing state is invalid. Probably because you have shared other screens or windows. Try calling stopScreenCapture to stop the current sharing and start sharing the screen again.

setScreenCaptureScenario

Sets the screen sharing scenario.

abstract setScreenCaptureScenario(screenScenario: ScreenScenarioType): number;

Details

When you start screen sharing or window sharing, you can call this method to set the screen sharing scenario. The SDK adjusts the video quality and experience of the sharing according to the scenario.

Note: Agora recommends that you call this method before joining a channel.

Parameters

screenScenario
The screen sharing scenario. See ScreenScenarioType.

Returns

  • 0: Success.
  • < 0: Failure.

setSubscribeAudioBlocklist

Set the blocklist of subscriptions for audio streams.

abstract setSubscribeAudioBlocklist(
    uidList: number[],
    uidNumber: number
  ): number;

Details

You can call this method to specify the audio streams of a user that you do not want to subscribe to.

Attention:
  • You can call this method either before or after joining a channel.
  • The blocklist is not affected by the setting in muteRemoteAudioStream,muteAllRemoteAudioStreams, and autoSubscribeAudio in ChannelMediaOptions.
  • Once the blocklist of subscriptions is set, it is effective even if you leave the current channel and rejoin the channel.
  • If a user is added in the allowlist and blocklist at the same time, only the blocklist takes effect.

Parameters

uidList

The user ID list of users that you do not want to subscribe to.

If you want to specify the audio streams of a user that you do not want to subscribe to, add the user ID in this list. If you want to remove a user from the blocklist, you need to call the setSubscribeAudioBlocklist method to update the user ID list; this means you only add the uid of users that you do not want to subscribe to in the new user ID list.

uidNumber
The number of users in the user ID list.

Returns

  • 0: Success.
  • < 0: Failure.

setSubscribeAudioAllowlist

Sets the allowlist of subscriptions for audio streams.

abstract setSubscribeAudioAllowlist(
    uidList: number[],
    uidNumber: number
  ): number;

Details

You can call this method to specify the audio streams of a user that you want to subscribe to.

Note:
  • You can call this method either before or after joining a channel.
  • The allowlist is not affected by the setting in muteRemoteAudioStream, muteAllRemoteAudioStreams and autoSubscribeAudio in ChannelMediaOptions.
  • Once the allowlist of subscriptions is set, it is effective even if you leave the current channel and rejoin the channel.
  • If a user is added in the allowlist and blocklist at the same time, only the blocklist takes effect.

Parameters

uidList

The user ID list of users that you want to subscribe to.

If you want to specify the audio streams of a user for subscription, add the user ID in this list. If you want to remove a user from the allowlist, you need to call the setSubscribeAudioAllowlist method to update the user ID list; this means you only add the uid of users that you want to subscribe to in the new user ID list.

uidNumber
The number of users in the user ID list.

Returns

  • 0: Success.
  • < 0: Failure.

setSubscribeVideoBlocklist

Set the blocklist of subscriptions for video streams.

abstract setSubscribeVideoBlocklist(
    uidList: number[],
    uidNumber: number
  ): number;

Details

You can call this method to specify the video streams of a user that you do not want to subscribe to.

Note:
  • You can call this method either before or after joining a channel.
  • The blocklist is not affected by the setting in muteRemoteVideoStream, muteAllRemoteVideoStreams and autoSubscribeAudio in ChannelMediaOptions.
  • Once the blocklist of subscriptions is set, it is effective even if you leave the current channel and rejoin the channel.
  • If a user is added in the allowlist and blocklist at the same time, only the blocklist takes effect.

Parameters

uidList

The user ID list of users that you do not want to subscribe to.

If you want to specify the video streams of a user that you do not want to subscribe to, add the user ID of that user in this list. If you want to remove a user from the blocklist, you need to call the setSubscribeVideoBlocklist method to update the user ID list; this means you only add the uid of users that you do not want to subscribe to in the new user ID list.

uidNumber
The number of users in the user ID list.

Returns

  • 0: Success.
  • < 0: Failure.

setSubscribeVideoAllowlist

Set the allowlist of subscriptions for video streams.

abstract setSubscribeVideoAllowlist(
    uidList: number[],
    uidNumber: number
  ): number;

Details

You can call this method to specify the video streams of a user that you want to subscribe to.

Note:
  • You can call this method either before or after joining a channel.
  • The allowlist is not affected by the setting in muteRemoteVideoStream, muteAllRemoteVideoStreams and autoSubscribeAudio in ChannelMediaOptions.
  • Once the allowlist of subscriptions is set, it is effective even if you leave the current channel and rejoin the channel.
  • If a user is added in the allowlist and blocklist at the same time, only the blocklist takes effect.

Parameters

uidList

The user ID list of users that you want to subscribe to.

If you want to specify the video streams of a user for subscription, add the user ID of that user in this list. If you want to remove a user from the allowlist, you need to call the setSubscribeVideoAllowlist method to update the user ID list; this means you only add the uid of users that you want to subscribe to in the new user ID list.

uidNumber
The number of users in the user ID list.

Returns

  • 0: Success.
  • < 0: Failure.

setVideoDenoiserOptions

Sets video noise reduction.

abstract setVideoDenoiserOptions(
    enabled: boolean,
    options: VideoDenoiserOptions,
    type?: MediaSourceType
  ): number;

Details

Underlit environments and low-end video capture devices can cause video images to contain significant noise, which affects video quality. In real-time interactive scenarios, video noise also consumes bitstream resources and reduces encoding efficiency during encoding.

You can call this method to enable the video noise reduction feature and set the options of the video noise reduction effect.

Attention:
  • Call this method after calling enableVideo.
  • Video noise reduction has certain requirements for equipment performance. If your device overheats after you enable video noise reduction, Agora recommends modifying the video noise reduction options to a less performance-consuming level or disabling video noise reduction entirely.
  • Both this method and setExtensionProperty can turn on video noise reduction function:
    • When you use the SDK to capture video, Agora recommends this method (this method only works for video captured by the SDK).
    • When you use an external video source to implement custom video capture, or send an external video source to the SDK, Agora recommends using setExtensionProperty.
  • This method relies on the image enhancement dynamic library libagora_clear_vision_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

enabled
Whether to enable video noise reduction:
  • true: Enable video noise reduction.
  • false: (Default) Disable video noise reduction.
options
The video noise reduction options. See VideoDenoiserOptions.
type
The type of the video source. See MediaSourceType.

Returns

  • 0: Success.
  • < 0: Failure.

setVideoEncoderConfiguration

Sets the video encoder configuration.

abstract setVideoEncoderConfiguration(
    config: VideoEncoderConfiguration
  ): number;

Sets the encoder configuration for the local video. Each configuration profile corresponds to a set of video parameters, including the resolution, frame rate, and bitrate.

Call timing

Call this method before joining a channel. Agora recommends calling this method before enableVideo to reduce the time to render the first video frame.

Restrictions

  • The config specified in this method is the maximum value under ideal network conditions. If the video engine cannot render the video using the specified config due to unreliable network conditions, the parameters further down the list are considered until a successful configuration is found.

Parameters

config
Video profile. See VideoEncoderConfiguration.

Returns

  • 0: Success.
  • < 0: Failure.

setVideoScenario

Sets video application scenarios.

abstract setVideoScenario(scenarioType: VideoApplicationScenarioType): number;

Details

After successfully calling this method, the SDK will automatically enable the best practice strategies and adjust key performance metrics based on the specified scenario, to optimize the video experience.

Attention: Call this method before joining a channel.

Parameters

scenarioType
The type of video application scenario. See VideoApplicationScenarioType.
ApplicationScenarioMeeting (1) is suitable for meeting scenarios. The SDK automatically enables the following strategies:
  • In meeting scenarios where low-quality video streams are required to have a high bitrate, the SDK automatically enables multiple technologies used to deal with network congestions, to enhance the performance of the low-quality streams and to ensure the smooth reception by subscribers.
  • The SDK monitors the number of subscribers to the high-quality video stream in real time and dynamically adjusts its configuration based on the number of subscribers.
    • If nobody subscribers to the high-quality stream, the SDK automatically reduces its bitrate and frame rate to save upstream bandwidth.
    • If someone subscribes to the high-quality stream, the SDK resets the high-quality stream to the VideoEncoderConfiguration configuration used in the most recent calling of setVideoEncoderConfiguration. If no configuration has been set by the user previously, the following values are used:
      • Resolution: 960 × 540
      • Frame rate: 15 fps
      • Bitrate: 1000 Kbps
  • The SDK monitors the number of subscribers to the low-quality video stream in real time and dynamically enables or disables it based on the number of subscribers.
    Note: If the user has called setDualStreamMode to set that never send low-quality video stream (DisableSimulcastStream), the dynamic adjustment of the low-quality stream in meeting scenarios will not take effect.
    • If nobody subscribes to the low-quality stream, the SDK automatically disables it to save upstream bandwidth.
    • If someone subscribes to the low-quality stream, the SDK enables the low-quality stream and resets it to the SimulcastStreamConfig configuration used in the most recent calling of setDualStreamMode. If no configuration has been set by the user previously, the following values are used:
      • Resolution: 480 × 272
      • Frame rate: 15 fps
      • Bitrate: 500 Kbps

ApplicationScenario1v1 (2) is suitable for 1v1 video call scenarios. To meet the requirements for low latency and high-quality video in this scenario, the SDK optimizes its strategies, improving performance in terms of video quality, first frame rendering, latency on mid-to-low-end devices, and smoothness under weak network conditions.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).
    • -4: Video application scenarios are not supported. Possible reasons include that you use the Voice SDK instead of the Video SDK.
    • -7: The IRtcEngine object has not been initialized. You need to initialize the IRtcEngine object before calling this method.

setVoiceBeautifierParameters

Sets parameters for the preset voice beautifier effects.

abstract setVoiceBeautifierParameters(
  preset: VoiceBeautifierPreset,
  param1: number,
  param2: number
): number;

Details

Call this method to set a gender characteristic and a reverberation effect for the singing beautifier effect. This method sets parameters for the local user who sends an audio stream. After setting the audio parameters, all users in the channel can hear the effect.

To achieve better vocal effects, it is recommended that you call the following APIs before calling this method:
  • Call setAudioScenario to set the audio scenario to high-quality audio scenario, namely AudioScenarioGameStreaming(3).
  • Call setAudioProfile to set the profile parameter to AudioProfileMusicHighQuality(4) or AudioProfileMusicHighQualityStereo(5).
Attention:
  • You can call this method either before or after joining a channel.
  • Do not set the profile parameter in setAudioProfile to AudioProfileSpeechStandard(1) or AudioProfileIot(6), or the method does not take effect.
  • This method has the best effect on human voice processing, and Agora does not recommend calling this method to process audio data containing music.
  • After calling setVoiceBeautifierParameters, Agora does not recommend calling the following methods, otherwise the effect set by setVoiceBeautifierParameters will be overwritten:
  • This method relies on the voice beautifier dynamic library libagora_audio_beauty_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

preset
The option for the preset audio effect:
  • SINGING_BEAUTIFIER: The singing beautifier effect.
param1
The gender characteristics options for the singing voice:
  • 1: A male-sounding voice.
  • 2: A female-sounding voice.
param2
The reverberation effect options for the singing voice:
  • 1: The reverberation effect sounds like singing in a small room.
  • 2: The reverberation effect sounds like singing in a large room.
  • 3: The reverberation effect sounds like singing in a hall.

Returns

  • 0: Success.
  • < 0: Failure.

setVoiceBeautifierPreset

Sets a preset voice beautifier effect.

abstract setVoiceBeautifierPreset(preset: VoiceBeautifierPreset): number;

Call this method to set a preset voice beautifier effect for the local user who sends an audio stream. After setting a voice beautifier effect, all users in the channel can hear the effect. You can set different voice beautifier effects for different scenarios.

Call timing

This method can be called either before or after joining the channel.

To achieve better vocal effects, it is recommended that you call the following APIs before calling this method:
  • Call setAudioScenario to set the audio scenario to high-quality audio scenario, namely AudioScenarioGameStreaming(3).
  • Call setAudioProfile to set the profile parameter to AudioProfileMusicHighQuality(4) or AudioProfileMusicHighQualityStereo(5).

Restrictions

  • Do not set the profile parameter in setAudioProfile to AudioProfileSpeechStandard(1) or AudioProfileIot(6), or the method does not take effect.
  • This method has the best effect on human voice processing, and Agora does not recommend calling this method to process audio data containing music.
  • After calling setVoiceBeautifierPreset, Agora does not recommend calling the following methods, otherwise the effect set by setVoiceBeautifierPreset will be overwritten:
  • This method relies on the voice beautifier dynamic library libagora_audio_beauty_extension.dll. If the dynamic library is deleted, the function cannot be enabled normally.

Parameters

preset

The preset voice beautifier effect options: VoiceBeautifierPreset.

Returns

  • 0: Success.
  • < 0: Failure.

setVoiceConversionPreset

Sets a preset voice beautifier effect.

abstract setVoiceConversionPreset(preset: VoiceConversionPreset): number;

Call this method to set a preset voice changing effect for the local user who publishes an audio stream in a channel. After setting the voice changing effect, all users in the channel can hear the effect. You can set different voice changing effects for the user depending on different scenarios.

Call timing

This method can be called either before or after joining the channel.

To achieve better vocal effects, it is recommended that you call the following APIs before calling this method:
  • Call setAudioScenario to set the audio scenario to high-quality audio scenario, namely AudioScenarioGameStreaming(3).
  • Call setAudioProfile to set the profile parameter to AudioProfileMusicHighQuality(4) or AudioProfileMusicHighQualityStereo(5).

Restrictions

Parameters

preset

The options for the preset voice beautifier effects: VoiceConversionPreset.

Returns

  • 0: Success.
  • < 0: Failure.

setVolumeOfEffect

Gets the volume of a specified audio effect file.

abstract setVolumeOfEffect(soundId: number, volume: number): number;

Call timing

Call this method after playEffect.

Restrictions

None.

Parameters

soundId
The ID of the audio effect. The ID of each audio effect file is unique.
volume
The playback volume. The value range is [0, 100]. The default value is 100, which represents the original volume.

Returns

  • 0: Success.
  • < 0: Failure.

startAudioMixing

Starts playing the music file.

abstract startAudioMixing(
    filePath: string,
    loopback: boolean,
    cycle: number,
    startPos?: number
  ): number;

For the audio file formats supported by this method, see What formats of audio files does the Agora RTC SDK support. If the local music file does not exist, the SDK does not support the file format, or the the SDK cannot access the music file URL, the SDK reports AudioMixingReasonCanNotOpen.

Call timing

You can call this method either before or after joining a channel.

Restrictions

  • If you call this method to play short sound effect files, you may encounter playback failure. Agora recommends using playEffect instead to play such files.
  • If you need to call this method multiple times, ensure that the time interval between calling this method is more than 500 ms.
  • On Android, there are following considerations:
    • To use this method, ensure that the Android device is v4.2 or later, and the API version is v16 or later.
    • If you need to play an online music file, Agora does not recommend using the redirected URL address. Some Android devices may fail to open a redirected URL address.
    • If you call this method on an emulator, ensure that the music file is in the /sdcard/ directory and the format is MP3.

Parameters

filePath
File path:
  • Android: The file path, which needs to be accurate to the file name and suffix. Agora supports URL addresses, absolute paths, or file paths that start with /assets/. You might encounter permission issues if you use an absolute path to access a local file, so Agora recommends using a URI address instead. For example: content://com.android.providers.media.documents/document/audio%3A14441
  • iOS: The absolute path or URL address (including the suffixes of the filename) of the audio effect file. For example: /var/mobile/Containers/Data/audio.mp4.
loopback
Whether to only play music files on the local client:
  • true: Only play music files on the local client so that only the local user can hear the music.
  • false: Publish music files to remote clients so that both the local user and remote users can hear the music.
cycle
The number of times the music file plays.
  • >0: The number of times for playback. For example, 1 represents playing 1 time.
  • -1: Play the audio file in an infinite loop.
startPos
The playback position (ms) of the music file.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).
    • -2: The parameter is invalid.
    • -3: The SDK is not ready.
      • The audio module is disabled.
      • The program is not complete.
      • The initialization of IRtcEngine fails. Reinitialize the IRtcEngine.

startAudioRecording

Starts audio recording on the client and sets recording configurations.

abstract startAudioRecording(config: AudioRecordingConfiguration): number;
The Agora SDK allows recording during a call. After successfully calling this method, you can record the audio of users in the channel and get an audio recording file. Supported formats of audio files are as follows:
  • WAV: High-fidelity files with typically larger file sizes. For example, if the sample rate is 32,000 Hz, the file size for 10-minute recording is approximately 73 MB.
  • AAC: Low-fidelity files with typically smaller file sizes. For example, if the sample rate is 32,000 Hz and the recording quality is AudioRecordingQualityMedium, the file size for 10-minute recording is approximately 2 MB.

Once the user leaves the channel, the recording automatically stops.

Call timing

Call this method after joining a channel.

Restrictions

None.

Parameters

config
Recording configurations. See AudioRecordingConfiguration.

Returns

  • 0: Success.
  • < 0: Failure.

startCameraCapture

Starts camera capture.

abstract startCameraCapture(
    sourceType: VideoSourceType,
    config: CameraCapturerConfiguration
  ): number;

Details

You can call this method to start capturing video from one or more cameras by specifying sourceType.

Note: On the iOS platform, if you want to enable multi-camera capture, you need to call enableMultiCamera and set enabled to true before calling this method.

Parameters

sourceType

The type of the video source. See VideoSourceType.

Note:
  • On iOS devices, you can capture video from up to 2 cameras, provided the device has multiple cameras or supports external cameras.
  • On Android devices, you can capture video from up to 4 cameras, provided the device has multiple cameras or supports external cameras.
config

The configuration of the video capture. See CameraCapturerConfiguration.

Note: On the iOS platform, this parameter has no practical function. Use the config parameter in enableMultiCamera instead to set the video capture configuration.

Returns

  • 0: Success.
  • < 0: Failure.

startDirectCdnStreaming

Starts pushing media streams to the CDN directly.

abstract startDirectCdnStreaming(
    eventHandler: IDirectCdnStreamingEventHandler,
    publishUrl: string,
    options: DirectCdnStreamingMediaOptions
  ): number;

Details

Aogra does not support pushing media streams to one URL repeatedly.

Media options

Agora does not support setting the value of publishCameraTrack and publishCustomVideoTrack as true, or the value of publishMicrophoneTrack and publishCustomAudioTrack as true at the same time. When choosing media setting options (DirectCdnStreamingMediaOptions), you can refer to the following examples:

If you want to push audio and video streams captured by the host from a custom source, the media setting options should be set as follows:

  • publishCustomAudioTrack is set as true and call the pushAudioFrame method
  • publishCustomVideoTrack is set as true and call the pushVideoFrame method
  • publishCameraTrack is set as false (the default value)
  • publishMicrophoneTrack is set as false (the default value)
As of v4.2.0, Agora SDK supports audio-only live streaming. You can set publishCustomAudioTrack or publishMicrophoneTrack in DirectCdnStreamingMediaOptions as true and call pushAudioFrame to push audio streams.
Note: Agora only supports pushing one audio and video streams or one audio streams to CDN.

Parameters

eventHandler
See onDirectCdnStreamingStateChanged and onDirectCdnStreamingStats.
publishUrl
The CDN live streaming URL.
options
The media setting options for the host. See DirectCdnStreamingMediaOptions.

Returns

  • 0: Success.
  • < 0: Failure.

startEchoTest

Starts an audio device loopback test.

abstract startEchoTest(config: EchoTestConfiguration): number;

To test whether the user's local sending and receiving streams are normal, you can call this method to perform an audio and video call loop test, which tests whether the audio and video devices and the user's upstream and downstream networks are working properly.

After starting the test, the user needs to make a sound or face the camera. The audio or video is output after about two seconds. If the audio playback is normal, the audio device and the user's upstream and downstream networks are working properly; if the video playback is normal, the video device and the user's upstream and downstream networks are working properly.

Call timing

You can call this method either before or after joining a channel.

Restrictions

  • When calling in a channel, make sure that no audio or video stream is being published.
  • After calling this method, call stopEchoTest to end the test; otherwise, the user cannot perform the next audio and video call loop test and cannot join the channel.
  • In live streaming scenarios, this method only applies to hosts.

Parameters

config
The configuration of the audio and video call loop test. See EchoTestConfiguration.

Returns

  • 0: Success.
  • < 0: Failure.

startLastmileProbeTest

Starts the last mile network probe test.

abstract startLastmileProbeTest(config: LastmileProbeConfig): number;

This method starts the last-mile network probe test before joining a channel to get the uplink and downlink last mile network statistics, including the bandwidth, packet loss, jitter, and round-trip time (RTT).

Call timing

Do not call other methods before receiving the onLastmileQuality and onLastmileProbeResult callbacks. Otherwise, the callbacks may be interrupted.

Restrictions

None.

Parameters

config
The configurations of the last-mile network probe test. See LastmileProbeConfig.

Returns

  • 0: Success.
  • < 0: Failure.

startLocalVideoTranscoder

Starts the local video mixing.

abstract startLocalVideoTranscoder(
    config: LocalTranscoderConfiguration
  ): number;

After calling this method, you can merge multiple video streams into one video stream locally. For example, you can merge the video streams captured by the camera, screen sharing, media player, remote video, video files, images, etc. into one video stream, and then publish the mixed video stream to the channel.

Applicable scenarios

You can enable the local video mixing function in scenarios such as remote conferences, live streaming, and online education, which allows users to view and manage multiple videos more conveniently, and supports portrait-in-picture effect and other functions.

The following is a typical use case for implementing the portrait-in-picture effect:
  1. Call enableVirtualBackground, and set the custom background image to BackgroundNone, that is, separate the portrait and the background in the video captured by the camera.
  2. Call startScreenCapture to start capturing the screen sharing video stream.
  3. Call this method and set the video source for capturing portraits as one of the video sources participating in the local video mixing, picture-in-picture of the portrait can be achived in the mixed video.

Call timing

Restrictions

  • Local video mixing requires more CPU resources. Therefore, Agora recommends enabling this function on devices with higher performance.
  • If you need to mix locally captured video streams, the SDK supports the following capture combinations:
    • On Android and iOS platforms, it supports video streams captured by up to 2 cameras (the device itself needs to support dual cameras or supports external cameras) + 1 screen sharing stream.
  • When configuring the local video mixing, it is necessary to ensure that the layer number of the video stream capturing the portrait is greater than the layer number of the screen sharing stream. Otherwise, the portrait will be covered by the screen sharing and will not be displayed in the final mixed video stream.

Parameters

config
Configuration of the local video mixing, see LocalTranscoderConfiguration.
Attention:
  • The maximum resolution of each video stream participating in the local video mixing is 4096 × 2160. If this limit is exceeded, video mixing does not take effect.
  • The maximum resolution of the mixed video stream is 4096 × 2160.

Returns

  • 0: Success.
  • < 0: Failure.

startMediaRenderingTracing

Enables tracing the video frame rendering process.

abstract startMediaRenderingTracing(): number;

Details

The SDK starts tracing the rendering status of the video frames in the channel from the moment this method is successfully called and reports information about the event through the onVideoRenderingTracingResult callback.

Note:
  • By default, the SDK starts tracing the video rendering event automatically when the local user successfully joins the channel. You can call this method at an appropriate time according to the actual application scenario to customize the tracing process.
  • After the local user leaves the current channel, the SDK automatically resets the time point to the next time when the user successfully joins the channel.

Applicable scenarios

Agora recommends that you use this method in conjunction with the UI settings (such as buttons and sliders) in your app to improve the user experience. For example, call this method when the user clicks the Join Channel button, and then get the indicators in the video frame rendering process through the onVideoRenderingTracingResult callback, so as to optimize the indicators accordingly.

Returns

  • 0: Success.
  • < 0: Failure.
    • -7: The method is called before IRtcEngine is initialized.

startOrUpdateChannelMediaRelay

Starts relaying media streams across channels or updates channels for media relay.

abstract startOrUpdateChannelMediaRelay(
    configuration: ChannelMediaRelayConfiguration
  ): number;

Details

The first successful call to this method starts relaying media streams from the source channel to the destination channels. To relay the media stream to other channels, or exit one of the current media relays, you can call this method again to update the destination channels. This feature supports relaying media streams to a maximum of six destination channels.

After a successful method call, the SDK triggers the onChannelMediaRelayStateChanged callback, and this callback returns the state of the media stream relay. Common states are as follows:
  • If the onChannelMediaRelayStateChanged callback returns RelayStateRunning (2) and RelayOk (0), it means that the SDK starts relaying media streams from the source channel to the destination channel.
  • If the onChannelMediaRelayStateChanged callback returns RelayStateFailure (3), an exception occurs during the media stream relay.
Attention:
  • Call this method after joining the channel.
  • This method takes effect only when you are a host in a live streaming channel.
  • The relaying media streams across channels function needs to be enabled by contacting technical support.
  • Agora does not support string user accounts in this API.

Parameters

configuration
The configuration of the media stream relay. See ChannelMediaRelayConfiguration.

Returns

  • 0: Success.
  • < 0: Failure.
    • -1: A general error occurs (no specified reason).
    • -2: The parameter is invalid.
    • -8: Internal state error. Probably because the user is not a broadcaster.

startPlaybackDeviceTest

Starts the audio playback device test.

abstract startPlaybackDeviceTest(testAudioFilePath: string): number;

Details

This method tests whether the audio device for local playback works properly. Once a user starts the test, the SDK plays an audio file specified by the user. If the user can hear the audio, the playback device works properly.

After calling this method, the SDK triggers the onAudioVolumeIndication callback every 100 ms, reporting uid = 1 and the volume information of the playback device.

The difference between this method and the startEchoTest method is that the former checks if the local audio playback device is working properly, while the latter can check the audio and video devices and network conditions.

Attention: Call this method before joining a channel. After the test is completed, call stopPlaybackDeviceTest to stop the test before joining a channel.

Parameters

testAudioFilePath
The path of the audio file. The data format is string in UTF-8.
  • Supported file formats: wav, mp3, m4a, and aac.
  • Supported file sample rates: 8000, 16000, 32000, 44100, and 48000 Hz.

Returns

  • 0: Success.
  • < 0: Failure.

startPreviewWithoutSourceType

Enables the local video preview.

abstract startPreviewWithoutSourceType(): number;

You can call this method to enable local video preview.

Call timing

This method must be called after enableVideo.

Restrictions

  • The local preview enables the mirror mode by default.
  • After leaving the channel, local preview remains enabled. You need to call stopPreview to disable local preview.

Returns

  • 0: Success.
  • < 0: Failure.

startPreview

Enables the local video preview and specifies the video source for the preview.

abstract startPreview(sourceType?: VideoSourceType): number;

This method is used to start local video preview and specify the video source that appears in the preview screen.

Call timing

This method must be called after enableVideo.

Restrictions

  • The local preview enables the mirror mode by default.
  • After leaving the channel, local preview remains enabled. You need to call stopPreview to disable local preview.

Parameters

sourceType
The type of the video source. See VideoSourceType.

Returns

  • 0: Success.
  • < 0: Failure.

startRhythmPlayer

Enables the virtual metronome.

abstract startRhythmPlayer(
  sound1: string,
  sound2: string,
  config: AgoraRhythmPlayerConfig
): number;
  • After enabling the virtual metronome, the SDK plays the specified audio effect file from the beginning, and controls the playback duration of each file according to beatsPerMinute you set in AgoraRhythmPlayerConfig. For example, if you set beatsPerMinute as 60, the SDK plays one beat every second. If the file duration exceeds the beat duration, the SDK only plays the audio within the beat duration.
  • By default, the sound of the virtual metronome is published in the channel. If you want the sound to be heard by the remote users, you can set publishRhythmPlayerTrack in ChannelMediaOptions as true.

Applicable scenarios

In music education, physical education and other scenarios, teachers usually need to use a metronome so that students can practice with the correct beat. The meter is composed of a downbeat and upbeats. The first beat of each measure is called a downbeat, and the rest are called upbeats.

Call timing

This method can be called either before or after joining the channel.

Restrictions

None.

Parameters

sound1
The absolute path or URL address (including the filename extensions) of the file for the downbeat. For example, C:\music\audio.mp4. For the audio file formats supported by this method, see What formats of audio files does the Agora RTC SDK support.
sound2
The absolute path or URL address (including the filename extensions) of the file for the upbeats. For example, C:\music\audio.mp4. For the audio file formats supported by this method, see What formats of audio files does the Agora RTC SDK support.
config
The metronome configuration. See AgoraRhythmPlayerConfig.

Returns

  • 0: Success.
  • < 0: Failure.
    • -22: Cannot find audio effect files. Please set the correct paths for sound1 and sound2.

startRtmpStreamWithoutTranscoding

Starts pushing media streams to a CDN without transcoding.

abstract startRtmpStreamWithoutTranscoding(url: string): number;

Details

Agora recommends that you use the server-side Media Push function. For details, see Use RESTful API.

You can call this method to push an audio or video stream to the specified CDN address. This method can push media streams to only one CDN address at a time, so if you need to push streams to multiple addresses, call this method multiple times.

After you call this method, the SDK triggers the onRtmpStreamingStateChanged callback on the local client to report the state of the streaming.

Attention:
  • Call this method after joining a channel.
  • Only hosts in the LIVE_BROADCASTING profile can call this method.
  • If you want to retry pushing streams after a failed push, make sure to call stopRtmpStream first, then call this method to retry pushing streams; otherwise, the SDK returns the same error code as the last failed push.

Parameters

url
The address of Media Push. The format is RTMP or RTMPS. The character length cannot exceed 1024 bytes. Special characters such as Chinese characters are not supported.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The URL or configuration of transcoding is invalid; check your URL and transcoding configurations.
    • -7: The SDK is not initialized before calling this method.
    • -19: The Media Push URL is already in use; use another URL instead.

startRtmpStreamWithTranscoding

Starts Media Push and sets the transcoding configuration.

abstract startRtmpStreamWithTranscoding(
    url: string,
    transcoding: LiveTranscoding
  ): number;

Details

Agora recommends that you use the server-side Media Push function. For details, see Use RESTful API.

You can call this method to push a live audio-and-video stream to the specified CDN address and set the transcoding configuration. This method can push media streams to only one CDN address at a time, so if you need to push streams to multiple addresses, call this method multiple times.

Under one Agora project, the maximum number of concurrent tasks to push media streams is 200 by default. If you need a higher quota, contact technical support.

After you call this method, the SDK triggers the onRtmpStreamingStateChanged callback on the local client to report the state of the streaming.

Attention:
  • Call this method after joining a channel.
  • Only hosts in the LIVE_BROADCASTING profile can call this method.
  • If you want to retry pushing streams after a failed push, make sure to call stopRtmpStream first, then call this method to retry pushing streams; otherwise, the SDK returns the same error code as the last failed push.

Parameters

url
The address of Media Push. The format is RTMP or RTMPS. The character length cannot exceed 1024 bytes. Special characters such as Chinese characters are not supported.
transcoding

The transcoding configuration for Media Push. See LiveTranscoding.

Returns

  • 0: Success.
  • < 0: Failure.
    • -2: The URL or configuration of transcoding is invalid; check your URL and transcoding configurations.
    • -7: The SDK is not initialized before calling this method.
    • -19: The Media Push URL is already in use; use another URL instead.

startScreenCapture

Starts screen capture.

abstract startScreenCapture(captureParams: ScreenCaptureParameters2): number;
Attention:
  • The billing for the screen sharing stream is based on the dimensions in ScreenVideoParameters:
    • When you do not pass in a value, Agora bills you at 1280 × 720.
    • When you pass in a value, Agora bills you at that value.

Applicable scenarios

In the screen sharing scenario, you need to call this method to start capturing the screen video stream. F