[英]Peer to Peer Audio Calling on Android : Voice breaks and lag(delay in receiving packets) increases
我正在嘗試在Android上建立Peer to Peer音頻調用。 我使用Android手機和平板電腦進行通信,但收到大約40個數據包后,手機幾乎停止接收數據包,然后突然收到一些數據包並播放它們等等,但這個等待時間增加了。 類似地,平板電腦最初接收數據包並播放它們但延遲增加,並且語音在一段時間后開始崩潰,就好像某些數據包丟失一樣。 有什么想法導致這個問題......
這是應用程序的代碼...我只是在兩個設備上運行它時,在RecordAudio類中給出發送者和接收者的IP地址。
public class AudioRPActivity extends Activity implements OnClickListener {
DatagramSocket socketS,socketR;
DatagramPacket recvP,sendP;
RecordAudio rt;
PlayAudio pt;
Button sr,stop,sp;
TextView tv,tv1;
File rf;
boolean isRecording = false;
boolean isPlaying = false;
int frequency = 44100;
int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView)findViewById(R.id.text1);
tv1 = (TextView)findViewById(R.id.text2);
sr = (Button)findViewById(R.id.sr);
sp = (Button)findViewById(R.id.sp);
stop = (Button)findViewById(R.id.stop);
sr.setOnClickListener(this);
sp.setOnClickListener(this);
stop.setOnClickListener(this);
stop.setEnabled(false);
try
{
socketS=new DatagramSocket();
socketR=new DatagramSocket(6000);
}
catch(SocketException se)
{
tv.setText(se.toString());
finish();
}
}
public void onClick(View v) {
if(v == sr)
record();
else if(v == sp)
play();
else if(v == stop)
stopPlaying();
}
public void play()
{
stop.setEnabled(true);
sp.setEnabled(false);
pt = new PlayAudio();
pt.execute();
}
public void stopPlaying()
{
isRecording=false;
isPlaying = false;
stop.setEnabled(false);
}
public void record()
{
stop.setEnabled(true);
sr.setEnabled(false);
rt = new RecordAudio();
rt.execute();
}
private class PlayAudio extends AsyncTask<Void,String,Void>
{
@Override
protected Void doInBackground(Void... arg0)
{
isPlaying = true;
int bufferSize = AudioTrack.getMinBufferSize(frequency, channelConfiguration, audioEncoding);
byte[] audiodata = new byte[bufferSize];
try
{
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,frequency,channelConfiguration,
audioEncoding,4*bufferSize,AudioTrack.MODE_STREAM);
audioTrack.setPlaybackRate(frequency);
audioTrack.play();
while(isPlaying)
{
recvP=new DatagramPacket(audiodata,audiodata.length);
socketR.receive(recvP);
audioTrack.write(recvP.getData(), 0, recvP.getLength());
}
audioTrack.stop();
audioTrack.release();
}
catch(Throwable t)
{
Log.e("Audio Track","Playback Failed");
}
return null;
}
protected void onProgressUpdate(String... progress)
{
tv1.setText(progress[0].toString());
}
protected void onPostExecute(Void result)
{
sr.setEnabled(true);
sp.setEnabled(true);
}
}
private class RecordAudio extends AsyncTask<Void,String,Void>
{
@Override
protected Void doInBackground(Void... arg0)
{
isRecording = true;
try
{
int bufferSize = AudioTrack.getMinBufferSize(frequency, channelConfiguration, audioEncoding);
AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,frequency,channelConfiguration
,audioEncoding,4*bufferSize);
byte[] buffer = new byte[bufferSize];
audioRecord.startRecording();
int r=0;
while(isRecording)
{
int brr = audioRecord.read(buffer,0,bufferSize);
sendP=new DatagramPacket(buffer,brr,InetAddress.getByName("sender's/receiver's ip"),6000);
socketS.send(sendP);
publishProgress(String.valueOf(r));
r++;
}
audioRecord.stop();
audioRecord.release();
}
catch(Throwable t)
{
Log.e("AudioRecord","Recording Failed....");
}
return null;
}
protected void onProgressUpdate(String... progress)
{
tv.setText(progress[0].toString());
}
protected void onPostExecute(Void result)
{
sr.setEnabled(true);
sp.setEnabled(true);
}
}
}
通過網絡發送語音時,如果頻率為8000以上,我就會遇到麻煩。 44100聽起來很可怕。 那可能就是我的情況。
另一個困難是,使用UDP很難說數據包到達的順序。我已經看到一個實現將它們按正確的順序重新組合,但我現在找不到它。
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