[英]Android's AEC and Noise Suppressor aren't working on some devices
在使用具有VoIP功能的Android Unity應用程序時,我們發現在某些設備(特別是Galaxy S6)上,麥克風會拾取揚聲器輸出的聲音,從而導致大量的靜態,失真和回聲。 因此,我開始研究本機解決方案,以利用Android的某些AEC和NS功能。
我編寫了以下測試平台,該測試平台在Note 4等某些設備上運行良好。當同一個應用程序在Galaxy S6上運行時,就好像ARC和NS沒有很好地應用或根本沒有應用。
public class MainActivity extends Activity
{
private AudioRecord mAudioRecorder = null;
private AudioTrack mStreamingPlayer = null;
private Thread playbackThread = null;
private boolean useVoip = true;
int bufferSize;
int chunkSize;
private AutomaticGainControl agc;
private NoiseSuppressor suppressor;
private AcousticEchoCanceler aec;
private boolean manuallyAttachEffects = false;
private void StartRecordingAudio()
{
int sampleRate = 44100;
int channelConfig = AudioFormat.CHANNEL_IN_MONO;
int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
chunkSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
bufferSize = chunkSize * 10;
int audioSource = MediaRecorder.AudioSource.MIC;
if ( useVoip && !manuallyAttachEffects )
{
audioSource = MediaRecorder.AudioSource.VOICE_COMMUNICATION;
}
mAudioRecorder = new AudioRecord( audioSource,
sampleRate,
channelConfig,
audioFormat,
bufferSize );
if ( useVoip && manuallyAttachEffects )
{
SetupVoipEffects( mAudioRecorder.getAudioSessionId() );
}
mAudioRecorder.startRecording();
mStreamingPlayer = new AudioTrack( AudioManager.STREAM_MUSIC,
sampleRate,
AudioFormat.CHANNEL_OUT_MONO,
audioFormat,
bufferSize,
AudioTrack.MODE_STREAM );
mStreamingPlayer.play();
playbackThread = new Thread(new Runnable()
{
@Override
public void run() {
readAudioData();
}
});
playbackThread.start();
}
private void readAudioData()
{
Thread thisThread = Thread.currentThread();
byte[] buffer = new byte[chunkSize];
while ( !thisThread.isInterrupted() )
{
if ( mAudioRecorder == null )
break;
int bytesRead = mAudioRecorder.read(buffer, 0, chunkSize);
if ( bytesRead > 0 )
{
if ( mStreamingPlayer == null )
break;
mStreamingPlayer.write(buffer, 0, chunkSize);
}
}
}
private void SetupVoipEffects( int sessionId )
{
if(AutomaticGainControl.isAvailable())
{
agc = AutomaticGainControl.create( sessionId );
Log.d(LOG_TAG, "AGC is " + (agc.getEnabled()?"enabled":"disabled"));
if ( !agc.getEnabled() )
{
agc.setEnabled(true);
Log.d(LOG_TAG, "AGC is " + (agc.getEnabled()?"enabled":"disabled" +" after trying to enable"));
}
}
if(NoiseSuppressor.isAvailable())
{
suppressor = NoiseSuppressor.create( sessionId );
Log.d(LOG_TAG, "NS is " + (suppressor.getEnabled()?"enabled":"disabled"));
if ( !suppressor.getEnabled() )
{
suppressor.setEnabled(true);
Log.d(LOG_TAG, "NS is " + (suppressor.getEnabled()?"enabled":"disabled" +" after trying to disable"));
}
}
if(AcousticEchoCanceler.isAvailable())
{
aec = AcousticEchoCanceler.create( sessionId );
Log.d(LOG_TAG, "AEC is " + (aec.getEnabled()?"enabled":"disabled"));
if ( !aec.getEnabled() )
{
aec.setEnabled(true);
Log.d(LOG_TAG, "AEC is " + (aec.getEnabled()?"enabled":"disabled" +" after trying to disable"));
}
}
}
}
我嘗試了很多事情,例如對音頻記錄使用VOICE_COMMUNICATION,使用MIC以及手動創建NoiseSuppressor和AcousticEchoCanceller,禁用/啟用NuPlayer / AwesomePlayer等。 這些設備表明已支持並啟用了AEC,但似乎並沒有發生。 使用耳機或使用聽筒而不是揚聲器電話時,問題完全消失了(因此麥克風無法拾取揚聲器的聲音)。 我是在這里俯瞰巨大的東西,還是有可能報告一個錯誤?
如果AEC和NS在其他設備上運行不正常,我不會懷疑。
這是Android中的已知問題。 硬件AEC不可靠,即使有其他硬件報告,它也不受許多硬件的實施/支持。 我建議同時部署軟件AEC和硬件AEC,以使此功能在軟件中更穩定。 唯一的問題是軟件AEC很難正確完成,因此要准備進行大量測試。
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