filter/replay_gain: added option "replaygain_limit"

src/conf.c

@@ -72,6 +72,7 @@ static struct config_entry config_entries[] = {
 	{ .name = CONF_REPLAYGAIN, false, false },
 	{ .name = CONF_REPLAYGAIN_PREAMP, false, false },
 	{ .name = CONF_REPLAYGAIN_MISSING_PREAMP, false, false },
+	{ .name = CONF_REPLAYGAIN_LIMIT, false, false },
 	{ .name = CONF_VOLUME_NORMALIZATION, false, false },
 	{ .name = CONF_SAMPLERATE_CONVERTER, false, false },
 	{ .name = CONF_AUDIO_BUFFER_SIZE, false, false },

src/conf.h

@@ -48,6 +48,7 @@
 #define CONF_REPLAYGAIN                 "replaygain"
 #define CONF_REPLAYGAIN_PREAMP          "replaygain_preamp"
 #define CONF_REPLAYGAIN_MISSING_PREAMP  "replaygain_missing_preamp"
+#define CONF_REPLAYGAIN_LIMIT			"replaygain_limit"
 #define CONF_VOLUME_NORMALIZATION       "volume_normalization"
 #define CONF_SAMPLERATE_CONVERTER       "samplerate_converter"
 #define CONF_AUDIO_BUFFER_SIZE          "audio_buffer_size"

src/decoder_api.c

@@ -420,7 +420,8 @@ decoder_replay_gain(struct decoder *decoder,
 			return_db = 20.0 * log10f(
 				replay_gain_tuple_scale(
 					&replay_gain_info->tuples[replay_gain_get_real_mode()],
-					replay_gain_preamp));
+					replay_gain_preamp, replay_gain_missing_preamp,
+					replay_gain_limit));
 		}
 
 		decoder->replay_gain_info = *replay_gain_info;

src/filter/replay_gain_filter_plugin.c

@@ -78,11 +78,8 @@ static void
 replay_gain_filter_update(struct replay_gain_filter *filter)
 {
 	if (filter->mode != REPLAY_GAIN_OFF) {
-		const struct replay_gain_tuple *tuple =
-			&filter->info.tuples[filter->mode];
-		float scale = replay_gain_tuple_defined(tuple)
-			? replay_gain_tuple_scale(tuple, replay_gain_preamp)
-			: replay_gain_missing_preamp;
+		float scale = replay_gain_tuple_scale(&filter->info.tuples[filter->mode],
+		    replay_gain_preamp, replay_gain_missing_preamp, replay_gain_limit);
 		g_debug("scale=%f\n", (double)scale);
 
 		filter->volume = pcm_float_to_volume(scale);

src/replay_gain_config.c

@@ -37,8 +37,11 @@ static const char *const replay_gain_mode_names[] = {
 
 enum replay_gain_mode replay_gain_mode = REPLAY_GAIN_OFF;
 
+const bool DEFAULT_REPLAYGAIN_LIMIT = true;
+
 float replay_gain_preamp = 1.0;
 float replay_gain_missing_preamp = 1.0;
+bool replay_gain_limit;
 
 const char *
 replay_gain_get_mode_string(void)
@@ -129,6 +132,8 @@ void replay_gain_global_init(void)
 
 		replay_gain_missing_preamp = pow(10, f / 20.0);
 	}
+
+	replay_gain_limit = config_get_bool(CONF_REPLAYGAIN_LIMIT, DEFAULT_REPLAYGAIN_LIMIT);
 }
 
 enum replay_gain_mode replay_gain_get_real_mode(void)

src/replay_gain_config.h

@@ -28,6 +28,7 @@
 extern enum replay_gain_mode replay_gain_mode;
 extern float replay_gain_preamp;
 extern float replay_gain_missing_preamp;
+extern bool replay_gain_limit;
 
 void replay_gain_global_init(void);
 

src/replay_gain_info.c

@@ -21,17 +21,23 @@
 #include "replay_gain_info.h"
 
 float
-replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp)
+replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp, float missing_preamp, bool peak_limit)
 {
 	float scale;
 
-	scale = pow(10.0, tuple->gain / 20.0);
-	scale *= preamp;
-	if (scale > 15.0)
-		scale = 15.0;
+	if (replay_gain_tuple_defined(tuple))
+	{
+	    scale = pow(10.0, tuple->gain / 20.0);
+	    scale *= preamp;
+	    if (scale > 15.0)
+		    scale = 15.0;
 
-	if (scale * tuple->peak > 1.0)
-		scale = 1.0 / tuple->peak;
+	    if (peak_limit)
+		if (scale * tuple->peak > 1.0)
+			scale = 1.0 / tuple->peak;
+	} else {
+		scale = missing_preamp;
+	}
 
 	return scale;
 }

src/replay_gain_info.h

@@ -62,7 +62,7 @@ replay_gain_tuple_defined(const struct replay_gain_tuple *tuple)
 }
 
 float
-replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp);
+replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp, float missing_preamp, bool peak_limit);
 
 /**
  * Attempt to auto-complete missing data.  In particular, if album