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-rw-r--r--src/replayGain.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/replayGain.c b/src/replayGain.c
new file mode 100644
index 000000000..ece583a06
--- /dev/null
+++ b/src/replayGain.c
@@ -0,0 +1,80 @@
+
+#include "replayGain.h"
+
+#include "log.h"
+#include "conf.h"
+
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+/* Added 4/14/2004 by AliasMrJones */
+static int replayGainState = REPLAYGAIN_OFF;
+
+void initReplayGainState() {
+ if(!getConf()[CONF_REPLAYGAIN]) return;
+
+ if(strcmp(getConf()[CONF_REPLAYGAIN],"track")==0) {
+ replayGainState = REPLAYGAIN_TRACK;
+ }
+ else if(strcmp(getConf()[CONF_REPLAYGAIN],"album")==0) {
+ replayGainState = REPLAYGAIN_ALBUM;
+ }
+ else {
+ ERROR("replaygain value \"%s\" is invalid\n",
+ getConf()[CONF_REPLAYGAIN]);
+ exit(EXIT_FAILURE);
+ }
+}
+
+int getReplayGainState() {
+ return replayGainState;
+}
+
+float computeReplayGainScale(float gain, float peak){
+ float scale;
+
+ if(gain == 0.0) return(1);
+ scale = pow(10.0, gain/20.0);
+ if(scale > 15.0) scale = 15.0;
+
+ if (scale * peak > 1.0) {
+ scale = 1.0 / peak;
+ }
+ return(scale);
+}
+
+void doReplayGain(char * buffer, int bufferSize, AudioFormat * format,
+ float scale)
+{
+ mpd_sint16 * buffer16 = (mpd_sint16 *)buffer;
+ mpd_sint8 * buffer8 = (mpd_sint8 *)buffer;
+ mpd_sint32 temp32;
+
+ if(scale == 1.0) return;
+ switch(format->bits) {
+ case 16:
+ while(bufferSize > 0){
+ temp32 = *buffer16;
+ temp32 *= scale;
+ *buffer16 = temp32>32767 ? 32767 :
+ (temp32<-32768 ? -32768 : temp32);
+ buffer16++;
+ bufferSize-=2;
+ }
+ break;
+ case 8:
+ while(bufferSize>0){
+ temp32 = *buffer8;
+ temp32 *= scale;
+ *buffer8 = temp32>127 ? 127 :
+ (temp32<-128 ? -128 : temp32);
+ buffer8++;
+ bufferSize--;
+ }
+ break;
+ default:
+ ERROR("%i bits not supported by doReplaygain!\n", format->bits);
+ }
+}
+/* End of added code */