C++ (Cpp) volume_level_to_decibel Examples

Example #1

File: upnp_control.c Project: LeePorte/gmrender-resurrect

// Change volume variables from the given decibel. Quantize value according to
// our ranges.
static float change_volume_decibel(struct action_event *event, float raw_decibel) {
	int volume_level = volume_decibel_to_level(raw_decibel);
	// Since we quantize it to the level, lets calculate the
	// actual level.
	float decibel = volume_level_to_decibel(volume_level);

	char volume[10];
	snprintf(volume, sizeof(volume), "%d", volume_level);
	char db_volume[10];
	snprintf(db_volume, sizeof(db_volume), "%d", (int) (256 * decibel));

	fprintf(stderr, "Setting volume-db to %.2fdb == #%d\n",
		decibel, volume_level);

	change_volume_and_notify(event, volume, db_volume);
	return decibel;
}

Example #2

File: upnp_control.c Project: alinzai/audio

// Change volume variables from the given decibel. Quantize value according to
// our ranges.
static float change_volume_decibel(float raw_decibel) {
	int volume_level = volume_decibel_to_level(raw_decibel);
	// Since we quantize it to the level, lets calculate the
	// actual level.
	float decibel = volume_level_to_decibel(volume_level);

	char volume[10];
	snprintf(volume, sizeof(volume), "%d", volume_level);
	char db_volume[10];
	snprintf(db_volume, sizeof(db_volume), "%d", (int) (256 * decibel));

	Log_info("control", "Setting volume-db to %.2fdb == #%d",
		decibel, volume_level);

	change_volume(volume, db_volume);
	return decibel;
}

Example #3

File: upnp_control.c Project: LeePorte/gmrender-resurrect

static int set_volume(struct action_event *event) {
	const char *volume = upnp_get_string(event, "DesiredVolume");
	service_lock();
	int volume_level = atoi(volume);  // range 0..100
	if (volume_level < volume_range.min) volume_level = volume_range.min;
	if (volume_level > volume_range.max) volume_level = volume_range.max;
	const float decibel = volume_level_to_decibel(volume_level);

	char db_volume[10];
	snprintf(db_volume, sizeof(db_volume), "%d", (int) (256 * decibel));

	const double fraction = exp(decibel / 20 * log(10));
	fprintf(stderr, "Setting volume to #%d = %.2fdb (%.4f)\n",
		volume_level, decibel, fraction);

	change_volume_and_notify(event, volume, db_volume);
	output_set_volume(fraction);
	set_mute_toggle(volume_level == 0);
	service_unlock();

	return 0;
}

Example #4

File: upnp_control.c Project: alinzai/audio

static int set_volume(struct action_event *event) {
	const char *volume = upnp_get_string(event, "DesiredVolume");
	service_lock();
	int volume_level = atoi(volume);  // range 0..100
	if (volume_level < volume_range.min) volume_level = volume_range.min;
	if (volume_level > volume_range.max) volume_level = volume_range.max;
	const float decibel = volume_level_to_decibel(volume_level);

	char db_volume[10];
	snprintf(db_volume, sizeof(db_volume), "%d", (int) (256 * decibel));

	Log_info("control", "Setting %d volume-db to %d" , volume_level,(int)decibel);

	const double fraction = exp(decibel / 20 * log(10));

	change_volume(volume, db_volume);
	output_set_volume(fraction, volume_level);
	set_mute_toggle(volume_level == 0);
	service_unlock();

	return 0;
}