Adding on the fly volume normalization support. Code originally from mplayer, ported by syscrash, cleaned up by avuton, and further cleaned up by me (jat).

git-svn-id: https://svn.musicpd.org/mpd/trunk@4424 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/Makefile.am

@@ -49,6 +49,7 @@ mpd_headers = \
 	metadataChunk.h \
 	mpd_types.h \
 	myfprintf.h \
+	normalize.h \
 	outputBuffer.h \
 	path.h \
 	pcm_utils.h \
@@ -93,6 +94,7 @@ mpd_SOURCES = \
 	main.c \
 	metadataChunk.c \
 	myfprintf.c \
+	normalize.c \
 	outputBuffer.c \
 	path.c \
 	pcm_utils.c \

src/conf.c

@@ -171,6 +171,7 @@ void initConf(void)
 	registerConfigParam(CONF_REPLAYGAIN_PREAMP, 0, 0);
 	registerConfigParam(CONF_METADATA_TO_USE, 0, 0);
 	registerConfigParam(CONF_ID3V1_ENCODING, 0, 0);
+	registerConfigParam(CONF_VOLUME_NORMALIZATION, 0, 0);
 }
 
 static void addBlockParam(ConfigParam * param, char *name, char *value,

src/conf.h

@@ -58,6 +58,7 @@
 #define CONF_HTTP_PREBUFFER_SIZE	"http_prebuffer_size"
 #define CONF_METADATA_TO_USE		"metadata_to_use"
 #define CONF_ID3V1_ENCODING		"id3v1_encoding"
+#define CONF_VOLUME_NORMALIZATION	"volume_normalization"
 
 typedef struct _BlockParam {
 	char *name;

src/outputBuffer.c

@@ -22,6 +22,8 @@
 #include "playerData.h"
 #include "utils.h"
 #include "log.h"
+#include "normalize.h"
+#include "conf.h"
 
 #include <string.h>
 
@@ -76,6 +78,22 @@ int sendDataToOutputBuffer(OutputBuffer * cb, InputStream * inStream,
 	size_t datalen;
 	static char *convBuffer = NULL;
 	static long convBufferLen = 0;
+	static int normalEnable = -1;
+	ConfigParam *param;
+
+	if (normalEnable == -1) {
+		normalEnable = getBoolConfigParam(CONF_VOLUME_NORMALIZATION);
+		if (normalEnable == -1) {
+			/* not set */
+			normalEnable = 0;
+		} else if (normalEnable < 0) {
+			param = getConfigParam(CONF_VOLUME_NORMALIZATION);
+			WARNING("%s is not \"yes\" or \"no\" on line %i, "
+			        "disabling\n", CONF_VOLUME_NORMALIZATION,
+			        param->line);
+			normalEnable = 0;
+		}
+	}
 
 	if (cmpAudioFormat(&(cb->audioFormat), &(dc->audioFormat)) == 0) {
 		data = dataIn;
@@ -99,6 +117,8 @@ int sendDataToOutputBuffer(OutputBuffer * cb, InputStream * inStream,
 
 	if (replayGainInfo) {
 		doReplayGain(replayGainInfo, data, datalen, &cb->audioFormat);
+	} else if (normalEnable) {
+		normalizeData(data, datalen, &cb->audioFormat);
 	}
 
 	while (datalen) {