如何在Android中将音频格式（AudioFormat.CHANNEL_OUT_MONO）解析为AudioRecord.getMinBufferSize函数？

Question

我想在我的应用程序中进行实时音频流。我有一个名为listenUserVoice(String userVoice)的函数接受编码的base64语音数据。我的问题是当我使用AudioRecord.getMinBufferSize函数检索缓冲区大小时与AudioFormat.CHANNEL_OUT_MONO。它返回-2(ERROR_BAD_VALUE)。所以，我尝试修复错误，我发现 android AudioRecord.java 类中没有 AudioFormat.CHANNEL_OUT_MONO 的 switch case。

public void listenUserVoice(String userVoice) {
    Log.d(TAG, "voice data  " + userVoice);
    try {
        playBufSize = AudioRecord.getMinBufferSize(frequency, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);
        Log.d(TAG, "-------------- playBufSize  " + playBufSize);
        audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, playBufSize, AudioTrack.MODE_STREAM);
        bytes = new byte[playBufSize];

        if (audioTrack.getState() == AudioRecord.STATE_INITIALIZED){
            audioTrack.play();
        }

        byte[] decoded = Base64.decode(userVoice, Base64.DEFAULT);

        int i = 0;
        InputStream inputStream = new ByteArrayInputStream(decoded);
        while (true) {
            if ((i = inputStream.read(bytes)) == -1) break;
            audioTrack.write(bytes, 0, i);
        }
        inputStream.close();
    } catch (IOException e) {
        Log.d(TAG, "Error  " + e.getMessage());
        e.printStackTrace();
    }