Add audio mute feature

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>

app/src/main/java/net/ossrs/yasea/demo/MainActivity.java

@@ -73,6 +73,7 @@ public class MainActivity extends Activity implements RtmpHandler.RtmpListener,
         mPublisher.setPreviewResolution(1280, 720);
         mPublisher.setOutputResolution(384, 640);
         mPublisher.setVideoSmoothMode();
+        mPublisher.startCamera();
         btnPublish.setOnClickListener(new View.OnClickListener() {
             @Override

library/src/main/java/net/ossrs/yasea/SrsPublisher.java

@@ -17,11 +17,13 @@ public class SrsPublisher {
     private static AcousticEchoCanceler aec;
     private static AutomaticGainControl agc;
     private byte[] mPcmBuffer = new byte[4096];
+    private byte[] mMuteBuffer = new byte[11];
     private Thread aworker;
 
     private SrsCameraView mCameraView;
 
     private boolean sendAudioOnly = false;
+    private boolean sendVideoOnly = false;
     private int videoFrameCount;
     private long lastTimeMillis;
     private double mSamplingFps;
@@ -91,11 +93,14 @@ public class SrsPublisher {
                 android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_AUDIO);
                 mic.startRecording();
                 while (!Thread.interrupted()) {
-                    int size = mic.read(mPcmBuffer, 0, mPcmBuffer.length);
-                    if (size <= 0) {
-                        break;
+                    if (sendVideoOnly) {
+                        mEncoder.onGetPcmFrame(mMuteBuffer, mMuteBuffer.length);
+                    } else {
+                        int size = mic.read(mPcmBuffer, 0, mPcmBuffer.length);
+                        if (size > 0) {
+                            mEncoder.onGetPcmFrame(mPcmBuffer, size);
+                        }
                     }
-                    mEncoder.onGetPcmFrame(mPcmBuffer, size);
                 }
             }
         });
@@ -240,6 +245,10 @@ public class SrsPublisher {
         mEncoder.setVideoSmoothMode();
     }
 
+    public synchronized void setSendVideoOnly(boolean flag) {
+        sendVideoOnly = flag;
+    }
+
     public void setSendAudioOnly(boolean flag) {
         sendAudioOnly = flag;
     }