Read config file before starting audio

This way settings that affect audio can be read in before audio starts.

Since the config file is now read before starting audio, it is possible
to start in light or normal mode as configured.

If light mode was configured, then previously audio would be started in
normal mode and then immediatly switch to light mode after processing a
few callbacks.

src/audio.c

@@ -91,7 +91,7 @@ static int paudio_callback(const void *input_buffer,
 	return 0;
 }
 
-int start_portaudio(int *nominal_sample_rate, double *real_sample_rate)
+int start_portaudio(int *nominal_sample_rate, double *real_sample_rate, bool light)
 {
 	if(pthread_mutex_init(&audio_mutex,NULL)) {
 		error("Failed to setup audio mutex");
@@ -122,7 +122,7 @@ int start_portaudio(int *nominal_sample_rate, double *real_sample_rate)
 	}
 	if(channels > 2) channels = 2;
 	info.channels = channels;
-	info.light = false;
+	info.light = light;
 	err = Pa_OpenDefaultStream(&stream,channels,0,paFloat32,PA_SAMPLE_RATE,paFramesPerBufferUnspecified,paudio_callback,&info);
 	if(err!=paNoError)
 		goto error;

src/interface.c

@@ -917,11 +917,6 @@ static void start_interface(GApplication* app, void *p)
 
 	struct main_window *w = malloc(sizeof(struct main_window));
 
-	if(start_portaudio(&w->nominal_sr, &real_sr)) {
-		g_application_quit(app);
-		return;
-	}
-
 	w->app = GTK_APPLICATION(app);
 
 	w->zombie = 0;
@@ -934,6 +929,11 @@ static void start_interface(GApplication* app, void *p)
 
 	load_config(w);
 
+	if(start_portaudio(&w->nominal_sr, &real_sr, w->is_light)) {
+		g_application_quit(app);
+		return;
+	}
+
 	if(w->la < MIN_LA || w->la > MAX_LA) w->la = DEFAULT_LA;
 	if(w->bph < MIN_BPH || w->bph > MAX_BPH) w->bph = 0;
 	if(w->cal < MIN_CAL || w->cal > MAX_CAL)

src/tg.h

@@ -125,7 +125,7 @@ struct processing_data {
 	int is_light;
 };
 
-int start_portaudio(int *nominal_sample_rate, double *real_sample_rate);
+int start_portaudio(int *nominal_sample_rate, double *real_sample_rate, bool light);
 int terminate_portaudio();
 uint64_t get_timestamp(int light);
 int analyze_pa_data(struct processing_data *pd, int bph, double la, uint64_t events_from);