如何在Android上直接从麦克风播放声音？

Question

在我的应用程序中，我需要将麦克风的声音直接指向扬声器。没有其他行动。 我找到了一种通过播放文件和关闭扬声器来将声音从麦克风指向耳机的方法。所以我猜扬声器可以工作类似。但是我不知道如何摆脱播放文件的事情。谢谢。

speaker() { 
    m_audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE); 
    m_audioManager.setSpeakerphoneOn(true); // not needed I think 
    //m_audioManager.setRouting(AudioManager.MODE_NORMAL, AudioManager.ROUTE_EARPIECE, AudioManager.ROUTE_ALL); earpiece need this? 
    setVolumeControlStream(AudioManager.STREAM_VOICE_CALL); 
    m_audioManager.setMode(AudioManager.MODE_IN_CALL); 

Answer 1

使用AudioRecord & AudioTrack到&播放（改变记录来..._音乐，如果扬声器所需

static final int bufferSize = 200000; 
final short[] buffer = new short[bufferSize]; 
short[] readBuffer = new short[bufferSize]; 
public void run() { 
    isRecording = true; 
    android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO); 
    int buffersize = AudioRecord.getMinBufferSize(11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); 
    arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize); 
    atrack = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM); 
    atrack.setPlaybackRate(11025); 
    byte[] buffer = new byte[buffersize]; 
    arec.startRecording(); 
    atrack.play(); 
      while(isRecording) { 
       arec.read(buffer, 0, buffersize); 
       atrack.write(buffer, 0, buffer.length); 
       } 
    }