Android 在4.1 API leve 16 添加了回声消除处理 AcousticEchoCanceler
不过由于手机厂商太多，碎片化严重，实现效果也不一样，这里只做测试性使用
记录一下步骤：
检测系统是否支持回声消除
创建录制，并拿到sessionid
创建回声消除 关联录制的sessionid
创建播放，关联录制的sessionid
这三者由录制的sessionid 关联起来了，就能够实处理掉mic采集到的由喇叭播放出的声音了。
看代码：
public static boolean chkNewDev()
{
return android.os.Build.VERSION.SDK_INT >= 16;
}
public static boolean isDeviceSupport()
{
return AcousticEchoCanceler.isAvailable();
}
检测是否支持，居然存在不准确的情况？
int InitAudioRecord()
{
m_bufferSizeInBytes = AudioRecord.getMinBufferSize(m_sampleRateInHz, m_channelConfig, m_audioFormat);
if (chkNewDev())
{
m_audioRecord = new AudioRecord(MediaRecorder.AudioSource.VOICE_COMMUNICATION, m_sampleRateInHz, m_channelConfig, m_audioFormat, m_bufferSizeInBytes);
}
else
{
m_audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, m_sampleRateInHz, m_channelConfig, m_audioFormat, m_bufferSizeInBytes);
}
int packSize = Math.min(960, m_bufferSizeInBytes*2);
audioData = new short[packSize];
return 0;
}
如果系统支持回声消除，则用MediaRecorder.AudioSource.VOICE_COMMUNICATION
public int GetSessionId()
{
return m_audioRecord.getAudioSessionId();
}
获取mic的sessionid，给回声消除和播放关联用
public boolean initAEC(int audioSession)
{
if (m_canceler != null)
{
return false;
}
m_canceler = AcousticEchoCanceler.create(audioSession);
m_canceler.setEnabled(true);
return m_canceler.getEnabled();
}
创建回声消除 并使能
int InitAudioTrack()
{
int m_sampleRateInHz = 48000;
int m_channelConfig = AudioFormat.CHANNEL_IN_STEREO;
int m_audioFormat = AudioFormat.ENCODING_PCM_16BIT;
int m_bufferSizeInBytes = 1024*4;
if (chkNewDev() && m_recorder != null)
{
m_audioTrack = new AudioTrack(AudioManager.STREAM_VOICE_CALL, m_sampleRateInHz, m_channelConfig, m_audioFormat, m_bufferSizeInBytes, AudioTrack.MODE_STREAM, m_recorder.GetSessionId());
}
else
{
m_audioTrack = new AudioTrack(AudioManager.STREAM_VOICE_CALL, m_sampleRateInHz, m_channelConfig, m_audioFormat, m_bufferSizeInBytes, AudioTrack.MODE_STREAM);
}
return 0;
}
如果系统支持回声处理 则创建关联mic 的sessionid
ok，走通了
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
AudioManager audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
audioManager.setSpeakerphoneOn(true);
忘了说，在程序启动的时候需要设置一下 AudioManager.MODE_IN_COMMUNICATION 和 外放来验证回声处理效果
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