RTCLocalAudioFrameEvent

fun onLocalAudioFrame(
    pcm: ByteArray?,
    sampleRate: Int,
    channelCount: Int,
    audioFormat: Int
)

rtcEngine.setRtcLocalAudioFrameEvent(object : RTCLocalAudioFrameEvent {
    override fun onLocalAudioFrame(
        pcm: ByteArray?,
        sampleRate: Int,
        channelCount: Int,
        audioFormat: Int
    ) {
        // 投递到应用自己的工作线程
    }
})

val micTrack = rtcEngine.getLocalMicTrack(PreOptionMic.def)
micTrack.startCapture(null)