162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/* the Music Player Daemon (MPD)
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* (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
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* (c)2004 replayGain code by AliasMrJones
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "replayGain.h"
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#include "log.h"
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#include "conf.h"
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#include <string.h>
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#include <math.h>
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#include <stdlib.h>
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/* Added 4/14/2004 by AliasMrJones */
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static int replayGainState = REPLAYGAIN_OFF;
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static float replayGainPreamp = 1.0;
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void initReplayGainState() {
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ConfigParam * param = getConfigParam(CONF_REPLAYGAIN);
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if(!param) return;
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if(strcmp(param->value, "track") == 0) {
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replayGainState = REPLAYGAIN_TRACK;
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}
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else if(strcmp(param->value, "album") == 0) {
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replayGainState = REPLAYGAIN_ALBUM;
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}
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else {
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ERROR("replaygain value \"%s\" at line %i is invalid\n",
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param->value, param->line);
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exit(EXIT_FAILURE);
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}
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param = getConfigParam(CONF_REPLAYGAIN_PREAMP);
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if(param) {
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char * test;
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float f = strtod(param->value, &test);
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if(*test != '\0') {
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ERROR("Replaygain preamp \"%s\" is not a number at "
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"line %i\n", param->value, param->line);
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exit(EXIT_FAILURE);
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}
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if(f < -15 || f > 15) {
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ERROR("Replaygain preamp \"%s\" is not between -15 and"
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"15 at line %i\n",
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param->value, param->line);
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exit(EXIT_FAILURE);
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}
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replayGainPreamp = pow(10, f/20.0);
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}
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}
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static float computeReplayGainScale(float gain, float peak) {
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float scale;
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if(gain == 0.0) return(1);
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scale = pow(10.0, gain/20.0);
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scale*= replayGainPreamp;
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if(scale > 15.0) scale = 15.0;
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if (scale * peak > 1.0) {
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scale = 1.0 / peak;
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}
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return(scale);
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}
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ReplayGainInfo * newReplayGainInfo() {
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ReplayGainInfo * ret = malloc(sizeof(ReplayGainInfo));
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ret->albumGain = 0.0;
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ret->albumPeak = 0.0;
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ret->trackGain = 0.0;
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ret->trackPeak = 0.0;
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/* set to -1 so that we know in doReplayGain to compute the scale */
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ret->scale = -1.0;
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return ret;
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}
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void freeReplayGainInfo(ReplayGainInfo * info) {
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free(info);
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}
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void doReplayGain(ReplayGainInfo * info, char * buffer, int bufferSize,
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AudioFormat * format)
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{
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mpd_sint16 * buffer16;
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mpd_sint8 * buffer8;
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mpd_sint32 temp32;
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float scale;
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if(replayGainState == REPLAYGAIN_OFF || !info) return;
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if(info->scale < 0) {
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switch(replayGainState) {
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case REPLAYGAIN_TRACK:
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info->scale = computeReplayGainScale(info->trackGain,
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info->trackPeak);
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break;
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default:
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info->scale = computeReplayGainScale(info->albumGain,
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info->albumPeak);
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break;
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}
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}
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if(info->scale <= 1.01 && info->scale >= 0.99) return;
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buffer16 = (mpd_sint16 *)buffer;
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buffer8 = (mpd_sint8 *)buffer;
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scale = info->scale;
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switch(format->bits) {
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case 16:
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while(bufferSize > 0){
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temp32 = *buffer16;
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temp32 *= scale;
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*buffer16 = temp32>32767 ? 32767 :
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(temp32<-32768 ? -32768 : temp32);
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buffer16++;
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bufferSize-=2;
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}
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break;
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case 8:
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while(bufferSize>0){
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temp32 = *buffer8;
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temp32 *= scale;
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*buffer8 = temp32>127 ? 127 :
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(temp32<-128 ? -128 : temp32);
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buffer8++;
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bufferSize--;
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}
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break;
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default:
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ERROR("%i bits not supported by doReplaygain!\n", format->bits);
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}
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}
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