我正在尝试构建一个麦克风应用程序,麦克风的声音直接由扬声器播放。问题是听到的声音有延迟。代码如下。有没有办法避免这种延迟?我听说我们可以通过在c / c ++中添加本机代码然后从java调用它来避免这种情况。可能吗?如果是这样的话?
public class MainActivity extends AppCompatActivity {
boolean isRecording;
AudioManager am;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
Record record = new Record();
record.run();
}
public class Record extends Thread
{
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);
AudioRecord arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT,buffersize);
AudioTrack atrack = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM);
am.setRouting(AudioManager.MODE_NORMAL, AudioManager.ROUTE_EARPIECE, AudioManager.ROUTE_ALL);
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);
}
arec.stop();
atrack.stop();
isRecording = false;
}
}
}
答案 0 :(得分:3)
使用此课程在Android上设置原生音频:https://github.com/superpoweredSDK/Low-Latency-Android-Audio-iOS-Audio-Engine/tree/master/Superpowered/AndroidIO
您也可以在那里找到示例项目。
答案 1 :(得分:1)
你可以尝试这个名为superpowered的库声称具有低延迟音频而不是编写自己的本机代码。 希望这对你有用。源代码也可以在git hub上找到。