Streaming voice between Android Phones over WiFi

Question

I'm trying to stream audio from the mic from 1 Android to another over WiFi. After looking at some examples I made 2 applications with a single activity in each, 1 to capture and send audio and the other to receive.

I've used the Audiorecord and Audiotrack classes to capture and play. However, i just hear some crackling sound (which has now stopped after i made some changes though i reverted back)

The activity to send voice.

public class VoiceSenderActivity extends Activity {  private EditText target; private TextView streamingLabel; private Button startButton,stopButton;  public byte[] buffer; public static DatagramSocket socket; private int port=50005;         //which port?? AudioRecord recorder;  //Audio Configuration.  private int sampleRate = 8000;      //How much will be ideal? private int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;     private int audioFormat = AudioFormat.ENCODING_PCM_16BIT;         private boolean status = true;     @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      target = (EditText) findViewById (R.id.target_IP);     streamingLabel = (TextView) findViewById(R.id.streaming_label);     startButton = (Button) findViewById (R.id.start_button);     stopButton = (Button) findViewById (R.id.stop_button);      streamingLabel.setText("Press Start! to begin");      startButton.setOnClickListener (startListener);     stopButton.setOnClickListener (stopListener); }  private final OnClickListener stopListener = new OnClickListener() {      @Override     public void onClick(View arg0) {                 status = false;                 recorder.release();                 Log.d("VS","Recorder released");     }  };  private final OnClickListener startListener = new OnClickListener() {      @Override     public void onClick(View arg0) {                 status = true;                 startStreaming();                }  };  public void startStreaming() {       Thread streamThread = new Thread(new Runnable() {          @Override         public void run() {             try {                   int minBufSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);                 DatagramSocket socket = new DatagramSocket();                 Log.d("VS", "Socket Created");                  byte[] buffer = new byte[minBufSize];                  Log.d("VS","Buffer created of size " + minBufSize);                 DatagramPacket packet;                  final InetAddress destination = InetAddress.getByName(target.getText().toString());                 Log.d("VS", "Address retrieved");                   recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,sampleRate,channelConfig,audioFormat,minBufSize);                 Log.d("VS", "Recorder initialized");                  recorder.startRecording();                   while(status == true) {                       //reading data from MIC into buffer                     minBufSize = recorder.read(buffer, 0, buffer.length);                      //putting buffer in the packet                     packet = new DatagramPacket (buffer,buffer.length,destination,port);                      socket.send(packet);                   }                } catch(UnknownHostException e) {                 Log.e("VS", "UnknownHostException");             } catch (IOException e) {                 Log.e("VS", "IOException");             }            }      });     streamThread.start();  }  } 

The activity to receive voice

public class VoiceReceiverActivity extends Activity {   private Button receiveButton,stopButton;  public static DatagramSocket socket; private AudioTrack speaker;  //Audio Configuration.  private int sampleRate = 8000;      //How much will be ideal? private int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;     private int audioFormat = AudioFormat.ENCODING_PCM_16BIT;         private boolean status = true;   @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      receiveButton = (Button) findViewById (R.id.receive_button);     stopButton = (Button) findViewById (R.id.stop_button);     findViewById(R.id.receive_label);      receiveButton.setOnClickListener(receiveListener);     stopButton.setOnClickListener(stopListener);  }   private final OnClickListener stopListener = new OnClickListener() {      @Override     public void onClick(View v) {         status = false;         speaker.release();         Log.d("VR","Speaker released");      }  };   private final OnClickListener receiveListener = new OnClickListener() {      @Override     public void onClick(View arg0) {         status = true;         startReceiving();      }  };  public void startReceiving() {      Thread receiveThread = new Thread (new Runnable() {          @Override         public void run() {              try {                  DatagramSocket socket = new DatagramSocket(50005);                 Log.d("VR", "Socket Created");                   byte[] buffer = new byte[256];                   //minimum buffer size. need to be careful. might cause problems. try setting manually if any problems faced                 int minBufSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);                  speaker = new AudioTrack(AudioManager.STREAM_MUSIC,sampleRate,channelConfig,audioFormat,minBufSize,AudioTrack.MODE_STREAM);                  speaker.play();                  while(status == true) {                     try {                           DatagramPacket packet = new DatagramPacket(buffer,buffer.length);                         socket.receive(packet);                         Log.d("VR", "Packet Received");                          //reading content from packet                         buffer=packet.getData();                         Log.d("VR", "Packet data read into buffer");                          //sending data to the Audiotrack obj i.e. speaker                         speaker.write(buffer, 0, minBufSize);                         Log.d("VR", "Writing buffer content to speaker");                      } catch(IOException e) {                         Log.e("VR","IOException");                     }                 }               } catch (SocketException e) {                 Log.e("VR", "SocketException");             }           }      });     receiveThread.start(); }  } 

I used wireshark to check if the packets are being sent and i can see the packets. The source however, is the MAC address of the sending device and destination too something like a physical address. Not sure if this is relevant though.

So what's the problem with?

Answer 1

Hey there is an Open Source library called "Libstreaming" that is used for streaming voice/video over the network using WIFI. Just Have a look at it:

https://github.com/fyhertz/libstreaming

There are also some examples provided, kindly have a look at it:

https://github.com/fyhertz/libstreaming-examples

I have used the library to Stream RTSP Audio over the network,hope it may be useful.