/* the Music Player Daemon (MPD)
* (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
* (c)2004 replayGain code by AliasMrJones
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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;
static float replayGainPreamp = 1.0;
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);
}
if(getConf()[CONF_REPLAYGAIN_PREAMP]) {
char * test;
float f = strtod(getConf()[CONF_REPLAYGAIN_PREAMP], &test);
if(*test != '\0') {
ERROR("Replaygain preamp \"%s\" is not a number\n",
getConf()[CONF_REPLAYGAIN_PREAMP]);
exit(EXIT_FAILURE);
}
if(f < -15 || f > 15) {
ERROR("Replaygain preamp \"%s\" is not between -15 and"
"15\n",
getConf()[CONF_REPLAYGAIN_PREAMP]);
exit(EXIT_FAILURE);
}
replayGainPreamp = pow(10, f/20.0);
}
}
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);
scale*= replayGainPreamp;
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 */
