Automatically reload sound system when alsa channel is skewed

Fixes #182

src/alsa.c

@@ -699,9 +699,9 @@ poll_watch_cb(GIOChannel *source, GIOCondition condition, AlsaCard *card)
 
 		case G_IO_STATUS_NORMAL:
 			/* Actually bad, alsa failed to clear channel */
-			ERROR("Alsa failed to clear the channel");
+			WARN("Alsa failed to clear the channel");
 			if (callback)
-				callback(ALSA_CARD_ERROR, data);
+				callback(ALSA_CARD_RELOAD, data);
 			break;
 
 		case G_IO_STATUS_ERROR:

src/alsa.h

@@ -30,7 +30,8 @@ void alsa_card_free(AlsaCard *card);
 enum alsa_event {
 	ALSA_CARD_ERROR,
 	ALSA_CARD_DISCONNECTED,
-	ALSA_CARD_VALUES_CHANGED
+	ALSA_CARD_VALUES_CHANGED,
+	ALSA_CARD_RELOAD,
 };
 
 typedef void (*AlsaCb) (enum alsa_event event, gpointer data);

src/audio.c

@@ -58,6 +58,8 @@ audio_signal_to_str(AudioSignal signal)
 		return "card disconnected";
 	case AUDIO_CARD_ERROR:
 		return "card error";
+	case AUDIO_CARD_RELOAD:
+		return "card to be reloaded";
 	case AUDIO_VALUES_CHANGED:
 		return "values changed";
 	default:
@@ -305,6 +307,9 @@ on_alsa_event(enum alsa_event event, gpointer data)
 	case ALSA_CARD_VALUES_CHANGED:
 		invoke_handlers(audio, AUDIO_VALUES_CHANGED, AUDIO_USER_UNKNOWN);
 		break;
+	case ALSA_CARD_RELOAD:
+		invoke_handlers(audio, AUDIO_CARD_RELOAD, AUDIO_USER_UNKNOWN);
+		break;
 	default:
 		WARN("Unhandled alsa event: %d", event);
 	}

src/audio.h

@@ -66,6 +66,7 @@ enum audio_signal {
 	AUDIO_CARD_DISCONNECTED,
 	AUDIO_CARD_ERROR,
 	AUDIO_VALUES_CHANGED,
+	AUDIO_CARD_RELOAD,
 };
 
 typedef enum audio_signal AudioSignal;

src/main.c

@@ -298,6 +298,8 @@ on_audio_changed(Audio *audio, AudioEvent *event, G_GNUC_UNUSED gpointer data)
 		if (run_audio_error_dialog() == GTK_RESPONSE_YES)
 			audio_reload(audio);
 		break;
+	case AUDIO_CARD_RELOAD:
+		audio_reload(audio);
 	default:
 		break;
 	}