Package 

Class ScreenAudioCapturer

  • All Implemented Interfaces:
    io.livekit.android.audio.AudioBufferCallback 
    @RequiresApi(value = 29) 
public final class ScreenAudioCapturer
extends MixerAudioBufferCallback

    A mixer for capturing screen share audio.

    Requires a media projection, which can be obtained from the screen share track.

    Additionally, for screen capture to work properly while your app is in the background, a foreground service with the type microphone must be running. Otherwise, audio capture will not return any audio data.

    Example usage:

    suspend fun startScreenCapture(data: Intent) {
    if (ActivityCompat.checkSelfPermission(getApplication(), Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
        return
    }

    // Publish the screen share video.
    room.localParticipant.setScreenShareEnabled(true, data)

    // Optionally disable the mic for screenshare audio only
    // val javaAudioDeviceModule = (room.lkObjects.audioDeviceModule as? JavaAudioDeviceModule)
    // javaAudioDeviceModule?.setAudioRecordEnabled(false)

    // Publish the audio track.
    room.localParticipant.setMicrophoneEnabled(true)
    val screenCaptureTrack = room.localParticipant.getTrackPublication(Track.Source.SCREEN_SHARE)?.track as? LocalVideoTrack ?: return
    val audioTrack = room.localParticipant.getTrackPublication(Track.Source.MICROPHONE)?.track as? LocalAudioTrack ?: return

    // Start capturing the screen share audio.
    val audioCapturer = ScreenAudioCapturer.createFromScreenShareTrack(screenCaptureTrack) ?: return
    audioCapturer.gain = 0.1f // Lower the volume so that mic can still be heard clearly.
    audioTrack.setAudioBufferCallback(audioCapturer)
}

suspend fun stopScreenCapture() {
    (room.localParticipant.getTrackPublication(Track.Source.MICROPHONE)?.track as? LocalAudioTrack)
        ?.setAudioBufferCallback(null)
    room.localParticipant.setMicrophoneEnabled(false)
    room.localParticipant.setScreenShareEnabled(false)

    // Remember to release when done capturing.
    audioCapturer?.releaseAudioResources()
}