IMediaEngine
The IMediaEngine class.
pullPlaybackAudioFrame [1/2]
Pulls the remote audio data.
public abstract int pullPlaybackAudioFrame(byte[] data, int lengthInByte);
Details
Before calling this method, call setExternalAudioSink(enabled: true)
to notify the app to enable and set the external audio rendering.
After a successful call of this method, the app pulls the decoded and mixed audio data for playback.
- Call this method after joining a channel.
- Both this method and onPlaybackAudioFrame callback can be used to get audio data after remote mixing. Note that after calling setExternalAudioSink to enable external audio rendering, the app no longer receives data from the onPlaybackAudioFrame callback. Therefore, you should choose between this method and the onPlaybackAudioFrame callback based on your actual business requirements. The specific distinctions between them are as follows:
- After calling this method, the app automatically pulls the audio data from the SDK. By setting the audio data parameters, the SDK adjusts the frame buffer to help the app handle latency, effectively avoiding audio playback jitter.
- The SDK sends the audio data to the app through the onPlaybackAudioFrame callback. Any delay in processing the audio frames may result in audio jitter.
- This method is only used for retrieving audio data after remote mixing. If you need to get audio data from different audio processing stages such as capture and playback, you can register the corresponding callbacks by calling registerAudioFrameObserver.
Parameters
- data
- The remote audio data to be pulled. The data type is
byte[]
. - lengthInByte
- The data length (byte). The value of this parameter is related to the audio duration, and the values of the
sampleRate
andchannels
parameters that you set in setExternalAudioSink.lengthInByte
=sampleRate
/1000 × 2 ×channels
× audio duration (ms).
Returns
- 0: Success.
- < 0: Failure.
pullPlaybackAudioFrame [2/2]
Pulls the remote audio data.
public abstract int pullPlaybackAudioFrame(ByteBuffer data, int lengthInByte);
Details
Before calling this method, call the setExternalAudioSink(enabled: true)
method to notify the app to enable and set the external audio sink.
After a successful method call, the app pulls the decoded and mixed audio data for playback.
- Call this method after joining a channel.
- The difference between this method and the onPlaybackAudioFrame callback is as follows:
- onPlaybackAudioFrame: The SDK sends the audio data to the app through this callback. Any delay in processing the audio frames may result in audio jitter.
- pullPlaybackAudioFrame [1/2]: The app pulls the remote audio data. After setting the audio data parameters, the SDK adjusts the frame buffer and avoids problems caused by jitter in the external audio playback.
Parameters
- data
- The remote audio data to be pulled. The data type is
ByteBuffer
. - lengthInByte
- The length (in bytes) of the remote audio data. The value of this parameter is related to the audio duration,and the values of the sampleRate and channels parameters that you set in setExternalAudioSink. lengthInByte = sampleRate/1000 × 2 × channels × audio duration (ms).
Returns
- 0: Success.
- < 0: Failure.
pushExternalAudioFrame
Pushes the external audio frame to the SDK.
public abstract int pushExternalAudioFrame(byte[] data, long timestamp, int sampleRate, int channels, Constants.BytesPerSample bytesPerSample, int trackId);
Details
- Call createCustomAudioTrack to create a custom audio track and get the audio track ID.
- Call joinChannel [2/2] to join the channel. In ChannelMediaOptions, set publishCustomAduioTrackId to the audio track ID that you want to publish, and set publishCustomAudioTrack to
true
.
Parameters
- data
- The external audio data.
- timestamp
- The timestamp (ms) of the external audio frame. This parameter is required. You can use it to restore the order of the captured audio frames, or synchronize audio and video frames in video-related scenarios (including scenarios where external video sources are used).
- sampleRate
- The sample rate (Hz) of the external audio source, which can be set as 8000, 16000, 32000, 44100, or 48000.
- channels
- The number of audio channels of the external audio sink:
- 1: Mono.
- 2: Stereo.
- bytesPerSample
- The number of bytes per sample. For PCM, this parameter is generally set to 16 bits (2 bytes).
- trackId
- The audio track ID. Set this parameter to the custom audio track ID returned in createCustomAudioTrack.
Returns
- 0: Success.
- < 0: Failure.
registerFaceInfoObserver
Registers a facial information observer.
public abstract int registerFaceInfoObserver(IFaceInfoObserver receiver);
Details
- Since
- v4.3.1
You can call this method to register the onFaceInfo callback to receive the facial information processed by Agora speech driven extension. When calling this method to register a facial information observer, you can register callbacks in the IFaceInfoObserver class as needed. After successfully registering the facial information observer, the SDK triggers the callback you have registered when it captures the facial information converted by the speech driven extension.
- Ensure that you call this method before joining a channel.
- Before calling this method, you need to make sure that the speech driven extension has been enabled by calling enableExtension.
Applicable scenarios
Facial information processed by the Agora speech driven extension is BS (Blend Shape) data that complies with ARkit standards. You can further process the BS data using third-party 3D rendering engines, such as driving avatar to make mouth movements corresponding to speech.
Parameters
- observer
- Facial information observer, see IFaceInfoObserver.
Returns
- 0: Success.
- < 0: Failure.
registerAudioFrameObserver
Registers an audio frame observer object.
public abstract int registerAudioFrameObserver(IAudioFrameObserver observer);
Details
Call this method to register an audio frame observer object (register a callback). When you need the SDK to trigger onMixedAudioFrame, onRecordAudioFrame, onPlaybackAudioFrame or onEarMonitoringAudioFrame callback, you need to use this method to register the callbacks.
Parameters
- observer
-
The observer instance. See IAudioFrameObserver. Set the value as NULL to release the instance. Agora recommends calling this method after receiving onLeaveChannel to release the audio observer object.
Returns
- 0: Success.
- < 0: Failure.
registerFaceInfoObserver
Registers a facial information observer.
public abstract int registerFaceInfoObserver(IFaceInfoObserver receiver);
Details
- Since
- v4.3.1
You can call this method to register the onFaceInfo callback to receive the facial information processed by Agora speech driven extension. When calling this method to register a facial information observer, you can register callbacks in the IFaceInfoObserver class as needed. After successfully registering the facial information observer, the SDK triggers the callback you have registered when it captures the facial information converted by the speech driven extension.
- Ensure that you call this method before joining a channel.
- Before calling this method, you need to make sure that the speech driven extension has been enabled by calling enableExtension.
Applicable scenarios
Facial information processed by the Agora speech driven extension is BS (Blend Shape) data that complies with ARkit standards. You can further process the BS data using third-party 3D rendering engines, such as driving avatar to make mouth movements corresponding to speech.
Parameters
- observer
- Facial information observer, see IFaceInfoObserver.
Returns
- 0: Success.
- < 0: Failure.
registerVideoEncodedFrameObserver
Registers a receiver object for the encoded video image.
public abstract int registerVideoEncodedFrameObserver(IVideoEncodedFrameObserver receiver);
Details
If you only want to observe encoded video frames (such as h.264 format) without decoding and rendering the video, Agora recommends that you implement one IVideoEncodedFrameObserver class through this method.
- Call registerVideoFrameObserver to register the raw video frame observer before joining the channel.
- Call registerVideoEncodedFrameObserver to register the encoded video frame observer before joining the channel.
- After joining the channel, get the user IDs of group B users through onUserJoined, and then call setRemoteVideoSubscriptionOptions to set the encodedFrameOnly of this group of users to
true
. - Call muteAllRemoteVideoStreams
(false)
to start receiving the video streams of all remote users. Then:- The raw video data of group A users can be obtained through the callback in IVideoFrameObserver, and the SDK renders the data by default.
- The encoded video data of group B users can be obtained through the callback in IVideoEncodedFrameObserver.
- Call this method before joining a channel.
Parameters
- receiver
- The video frame observer object. See IVideoEncodedFrameObserver.
Returns
- 0: Success.
- < 0: Failure.
registerVideoFrameObserver
Registers a raw video frame observer object.
public abstract int registerVideoFrameObserver(IVideoFrameObserver observer);
Details
If you want to observe raw video frames (such as YUV or RGBA format), Agora recommends that you implement one IVideoFrameObserver class with this method.
When calling this method to register a video observer, you can register callbacks in the IVideoFrameObserver class as needed. After you successfully register the video frame observer, the SDK triggers the registered callbacks each time a video frame is received.
- Call registerVideoFrameObserver to register the raw video frame observer before joining the channel.
- Call registerVideoEncodedFrameObserver to register the encoded video frame observer before joining the channel.
- After joining the channel, get the user IDs of group B users through onUserJoined, and then call setRemoteVideoSubscriptionOptions to set the encodedFrameOnly of this group of users to
true
. - Call muteAllRemoteVideoStreams
(false)
to start receiving the video streams of all remote users. Then:- The raw video data of group A users can be obtained through the callback in IVideoFrameObserver, and the SDK renders the data by default.
- The encoded video data of group B users can be obtained through the callback in IVideoEncodedFrameObserver.
- Ensure that you call this method before joining a channel.
- When handling the video data returned in the callbacks, pay attention to the changes in the width and height parameters, which may be adapted under the following circumstances:
- When network conditions deteriorate, the video resolution decreases incrementally.
- If the user adjusts the video profile, the resolution of the video returned in the callbacks also changes.
Parameters
- observer
- The observer instance. See IVideoFrameObserver. To release the instance, set the value as NULL.
Returns
- 0: Success.
- < 0: Failure.
setExternalAudioSink
Sets the external audio sink.
public abstract int setExternalAudioSink(boolean enabled, int sampleRate, int channels);
Details
This method applies to scenarios where you want to use external audio data for playback. After you set the external audio sink, you can call pullPlaybackAudioFrame [1/2] to pull remote audio frames. The app can process the remote audio and play it with the audio effects that you want.
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.
setExternalAudioSource [2/2]
Sets the external audio source parameters.
public abstract int setExternalAudioSource(boolean enabled, int sampleRate, int channels, boolean localPlayback, boolean publish);
Details
- Deprecated:
- This method is deprecated, use createCustomAudioTrack instead.
Parameters
- enabled
-
Whether to enable the external audio source:
true
: Enable the external audio source.false
: (Default) Disable the external audio source.
- sampleRate
- The sample rate (Hz) of the external audio source which can be set as
8000
,16000
,32000
,44100
, or48000
. - channels
- The number of channels of the external audio source, which can be set as
1
(Mono) or2
(Stereo). - localPlayback
-
Whether to play the external audio source:
true
: Play the external audio source.false
: (Default) Do not play the external source.
- publish
-
Whether to publish audio to the remote users:
true
: (Default) Publish audio to the remote users.false
: Do not publish audio to the remote users.
Returns
- 0: Success.
- < 0: Failure.
setExternalVideoSource
Configures the external video source.
public abstract int setExternalVideoSource( boolean enable, boolean useTexture, Constants.ExternalVideoSourceType sourceType);
Details
Parameters
- enable
- Whether to use the external video source:
true
: Use the external video source. The SDK prepares to accept the external video frame.false
: (Default) Do not use the external video source.
- useTexture
- Whether to use the external video frame in the Texture format.
true
: Use the external video frame in the Texture format.false
: (Default) Do not use the external video frame in the Texture format.
- sourceType
- Whether the external video frame is encoded. See ExternalVideoSourceType.
Returns
- 0: Success.
- < 0: Failure.