don't just crash on buffer overrun, but show a warning icon

common.c

@@ -23,6 +23,7 @@ int          SNRdBthresh[10] = {30, 15, 10,   5,   3,   0,  -3,  -5, -10, -15};
 bool         Adaptive        = true;
 bool         ManualActivated = false;
 bool         Abort           = false;
+bool         BufferDrop      = false;
 
 pthread_t    thread1;
 
@@ -84,6 +85,7 @@ void changeDevices() {
 
   int status;
 
+  BufferDrop = false;
   Abort = true;
 
   pthread_join(thread1, NULL);

common.h

@@ -18,6 +18,7 @@ extern gshort     HedrShift;
 extern bool       Adaptive;
 extern bool       ManualActivated;
 extern bool       Abort;
+extern bool       BufferDrop;
 extern bool      *HasSync;
 
 extern pthread_t thread1;

pcm.c

@@ -25,12 +25,22 @@ void readPcm(gint numsamples) {
   samplesread = snd_pcm_readi(pcm_handle, tmp, (PcmPointer == 0 ? BUFLEN : numsamples));
 
   if (samplesread < numsamples) {
+    
     if      (samplesread == -EPIPE)    printf("ALSA: buffer overrun\n");
     else if (samplesread == -EBADFD)   printf("ALSA: PCM is not in the right state\n");
     else if (samplesread == -ESTRPIPE) printf("ALSA: a suspend event occurred\n");
     else if (samplesread < 0)          printf("ALSA error %d\n", samplesread);
     else                               printf("Can't read %d samples\n", numsamples);
-    exit(EXIT_FAILURE);
+    
+    // On first appearance of error, update the status icon
+    if (!BufferDrop) {
+      gdk_threads_enter();
+      gtk_image_set_from_stock(GTK_IMAGE(gui.devstatusicon),GTK_STOCK_DIALOG_WARNING,GTK_ICON_SIZE_SMALL_TOOLBAR);
+      gtk_widget_set_tooltip_text(gui.devstatusicon, "Device is dropping samples");
+      gdk_threads_leave();
+      BufferDrop = true;
+    }
+
   }
 
   if (PcmPointer == 0) {
@@ -99,6 +109,8 @@ int initPcmDevice(char *wanteddevname) {
   bool                 found;
   char                *cardname;
 
+  BufferDrop = false;
+
   snd_pcm_hw_params_alloca(&hwparams);
 
   card  = -1;

vis.c

@@ -92,8 +92,6 @@ guchar GetVIS () {
              (tone[14*3+i] > tone[0+j] - 725 && tone[14*3+i] < tone[0+j] - 675)    // 1200 Hz stop bit
            ) {
 
-          printf("Possible header @ %+.0f Hz\n",tone[0+j]-1900);
-
           // Attempt to read VIS
 
           gotvis = true;