[#2333] Fix alsa playback to reduce underrun

sflphone-common/src/audio/alsa/alsalayer.cpp

@@ -713,6 +713,8 @@ AlsaLayer::handle_xrun_playback (void)
         if (state  == SND_PCM_STATE_XRUN) {
             stopPlaybackStream ();
             preparePlaybackStream ();
+
+	    
             _trigger_request = true;
         }
     }
@@ -958,8 +960,12 @@ void AlsaLayer::audioCallback (void)
 
 		if((tone == 0) && (file_tone == 0)) {
 
-		    bzero (out, maxNbBytesToGet);
-		    write (out, maxNbBytesToGet);
+		    SFLDataFormat* zeros = (SFLDataFormat*)malloc (framesPerBufferAlsa * sizeof (SFLDataFormat));
+
+		    bzero (zeros, framesPerBufferAlsa * sizeof (SFLDataFormat));
+		    write (zeros, framesPerBufferAlsa * sizeof (SFLDataFormat));
+
+		    free (zeros);
 		}
             }
 

sflphone-common/src/audio/pulseaudio/pulselayer.cpp

@@ -473,7 +473,7 @@ void PulseLayer::writeToSpeaker (void)
 
     if (urgentAvailBytes > 0) {
 
-        _debug("urgentAvailBytes: %i\n", urgentAvailBytes);
+        // _debug("urgentAvailBytes: %i\n", urgentAvailBytes);
 
         toGet = (urgentAvailBytes < (int) (framesPerBuffer * sizeof (SFLDataFormat))) ? urgentAvailBytes : framesPerBuffer * sizeof (SFLDataFormat);
         out = (SFLDataFormat*) pa_xmalloc (toGet * sizeof (SFLDataFormat));
@@ -572,7 +572,7 @@ void PulseLayer::writeToSpeaker (void)
 
 		if((tone == 0) && (file_tone == 0)) {
 
-		    _debug("maxNbBytesToGet: %i\n", maxNbBytesToGet);
+		    // _debug("maxNbBytesToGet: %i\n", maxNbBytesToGet);
 		    SFLDataFormat* zeros = (SFLDataFormat*)pa_xmalloc (framesPerBuffer*sizeof(SFLDataFormat));
   
 		    bzero (zeros, framesPerBuffer*sizeof(SFLDataFormat));

sflphone-common/src/managerimpl.cpp

@@ -1689,9 +1689,6 @@ ManagerImpl::playDtmf (char code, bool isTalking)
     //                            ms/s
     size = (int) ((pulselen * (float) audiolayer->getSampleRate()) / 1000);
 
-    _debug("DTMF ---------------- size: %i\n", size);
-    _debug("DTMF ----------pulselength: %i\n", pulselen);
-
     // this buffer is for mono
     // TODO <-- this should be global and hide if same size
     buf = new SFLDataFormat[size];