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我正在尝试使用 Webrtc 在 Android 上构建屏幕共享应用程序。我可以使用 mediaprojection+webrtc 共享屏幕，但无法共享系统音频。Mediaprojection 在 AudioPlaybackCaptureConfiguration 的帮助下增加了对从 API 29 (Android 10) 捕获系统音频的支持。但是当我将音频源从音频记录分配给对等连接音轨时，应用程序崩溃了。

   MediaProjectionManager mediaProjectionManager =
            (MediaProjectionManager) mContext.getApplicationContext().getSystemService(
                    Context.MEDIA_PROJECTION_SERVICE);

    MediaProjection sMediaProjection =
            mediaProjectionManager.getMediaProjection(
                    MPResultCode,
                    MPData
            );

    AudioPlaybackCaptureConfiguration config = new AudioPlaybackCaptureConfiguration.Builder(sMediaProjection)
            .addMatchingUsage(AudioAttributes.USAGE_MEDIA)
            .build();

    AudioFormat audioFormat = new AudioFormat.Builder()
            .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
            .setSampleRate(8000)
            .setChannelMask(AudioFormat.CHANNEL_IN_MONO)
            .build();

    AudioRecord audioRecord = new AudioRecord.Builder()
            .setAudioFormat(audioFormat)
            .setBufferSizeInBytes(BUFFER_SIZE_IN_BYTES)
            .setAudioPlaybackCaptureConfig(config)
            .build();

    AudioSource audioSource = new AudioSource(audioRecord.getAudioSource());
    AudioTrack localAudioTrack = factory.createAudioTrack("AudioTrack", audioSource1);
    localAudioTrack.setEnabled(true);
    mLocalMediaStream.addTrack(localAudioTrack);

如果我如下配置音频源，则流式麦克风音频工作正常

    AudioSource audioSource = factory.createAudioSource(new MediaConstraints());

如何使用 AudioRecord 对象配置 webrtc 音轨？

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