Interface ILocalAudioTrack

LocalAudioTrack is the basic interface for local audio tracks, providing main methods of local audio tracks.

You can create a local audio track by calling AgoraRTC.createCustomAudioTrack.

The following interfaces are inherited from LocalAudioTrack:

  • MicrophoneAudioTrack, the interface for the audio sampled by a local microphone, which adds several microphone-related functions.
  • BufferSourceAudioTrack, the interface for the audio from a local audio file, which adds several audio-file-related functions.





enabled: boolean


isPlaying: boolean

Whether a media track is playing on the webpage:

  • true: The media track is playing on the webpage.
  • false: The media track is not playing on the webpage.


muted: boolean


processorDestination: IAudioProcessor


The destination of the current processing pipeline on the local audio track.


trackMediaType: "audio" | "video"

The type of a media track:

  • "audio": Audio track.
  • "video": Video track.



  • close(): void
  • Closes a local track and releases the audio and video resources that it occupies.

    Once you close a local track, you can no longer reuse it.

    Returns void


  • getListeners(event: string): Function[]
  • Gets all the listeners for a specified event.


    • event: string

      The event name.

    Returns Function[]


  • getMediaStreamTrack(): MediaStreamTrack



  • getTrackId(): string


  • getTrackLabel(): string
  • Gets the label of a local track.

    Returns string

    The label that the SDK returns may include:

    • The MediaDeviceInfo.label property, if the track is created by calling createMicrophoneAudioTrack or createCameraVideoTrack.
    • The sourceId property, if the track is created by calling createScreenVideoTrack.
    • The MediaStreamTrack.label property, if the track is created by calling createCustomAudioTrack or createCustomVideoTrack.


  • getVolumeLevel(): number
  • Gets the audio level of a local audio track.

    Returns number

    The audio level. The value range is [0,1]. 1 is the highest audio level. Usually a user with audio level above 0.6 is a speaking user.


  • off(event: string, listener: Function): void
  • Removes the listener for a specified event.


    • event: string

      The event name.

    • listener: Function

      The callback that corresponds to the event listener.

    Returns void


  • on(event: "track-ended", listener: typeof event_track_ended): void
  • Parameters

    • event: "track-ended"
    • listener: typeof event_track_ended

    Returns void


  • once(event: string, listener: Function): void
  • Listens for a specified event once.

    When the specified event happens, the SDK triggers the callback that you pass and then removes the listener.


    • event: string

      The event name.

    • listener: Function

      The callback to trigger.

    Returns void


  • pipe(processor: IAudioProcessor): IAudioProcessor
  • Inserts a Processor to the local audio track.


    • processor: IAudioProcessor

      The Processor instance. Each extension has a corresponding type of Processor.

    Returns IAudioProcessor

    The Processor instance.


  • play(): void
  • Plays a local audio track.

    When playing a audio track, you do not need to pass any DOM element.

    Returns void


  • removeAllListeners(event?: undefined | string): void
  • Removes all listeners for a specified event.


    • Optional event: undefined | string

      The event name. If left empty, all listeners for all events are removed.

    Returns void


  • setAudioFrameCallback(audioFrameCallback: null | function, frameSize?: undefined | number): void
  • Sets the callback for getting raw audio data in PCM format.

    After you successfully set the callback, the SDK constantly returns the audio frames of a local audio track in this callback by using AudioBuffer.

    You can set the frameSize parameter to determine the frame size in each callback, which affects the interval between the callbacks. The larger the frame size, the longer the interval between them.

    track.setAudioFrameCallback((buffer) => {
      for (let channel = 0; channel < buffer.numberOfChannels; channel += 1) {
        // Float32Array with PCM data
        const currentChannelData = buffer.getChannelData(channel);
        console.log("PCM data in channel", channel, currentChannelData);
    }, 2048);
    // ....
    // Stop getting the raw audio data


    • audioFrameCallback: null | function

      The callback function for receiving the AudioBuffer object. If you set audioBufferCallback as null, the SDK stops getting raw audio data.

    • Optional frameSize: undefined | number

      The number of samples of each audio channel that an AudioBuffer object contains. You can set frameSize as 256, 512, 1024, 2048, 4096, 8192, or 16384. The default value is 4096.

    Returns void


  • setEnabled(enabled: boolean): Promise<void>
  • Since

    Enables/Disables the track.

    After a track is disabled, the SDK stops playing and publishing the track.


    • enabled: boolean

      Whether to enable the track:

      • true: Enable the track.
      • false: Disable the track.

    Returns Promise<void>


  • setMuted(muted: boolean): Promise<void>
  • Sends or stops sending the media data of the track.


    If the track is published, a successful call of setMuted(true) triggers the user-unpublished event on the remote client, and a successful call of setMuted(false) triggers the user-published event.


    • muted: boolean

      Whether to stop sending the media data of the track:

      • true: Stop sending the media data of the track.
      • false: Resume sending the media data of the track.

    Returns Promise<void>


  • setPlaybackDevice(deviceId: string): Promise<void>
  • Since


    • As of v4.7.0, this method no longer takes effect. Use IRemoteAudioTrack.setPlaybackDevice instead.
    • This method supports Chrome on desktop devices only. Other browsers throw a 'NOT_SUPPORTED error when calling this method.

    Sets the playback device (speaker) for the remote audio stream.


    Returns Promise<void>


  • setVolume(volume: number): void
  • Sets the volume of a local audio track.


    • volume: number

      The volume. The value ranges from 0 (mute) to 1000 (maximum). A value of 100 is the original volume。 The volume change may not be obvious to human ear. If local track has been published, setting volume will affect the volume heard by remote users.

    Returns void


  • stop(): void


  • unpipe(): void
  • Since

    Removes the Processor inserted to the local audio track.

    Returns void