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  • Committer: Bazaar Package Importer
  • Author(s): Charles Majola
  • Date: 2005-02-15 10:43:58 UTC
  • Revision ID: james.westby@ubuntu.com-20050215104358-w8b7yaqqfmsoxj5k
Tags: upstream-0.11.5
Import upstream version 0.11.5

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src/replayGain.c
 
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/* 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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        if(!getConf()[CONF_REPLAYGAIN]) return;
 
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        if(strcmp(getConf()[CONF_REPLAYGAIN],"track")==0) {
 
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                replayGainState = REPLAYGAIN_TRACK;
 
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        }
 
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        else if(strcmp(getConf()[CONF_REPLAYGAIN],"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\" is invalid\n",
 
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                                getConf()[CONF_REPLAYGAIN]);
 
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                exit(EXIT_FAILURE);
 
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        }
 
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        if(getConf()[CONF_REPLAYGAIN_PREAMP]) {
 
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                char * test;
 
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                float f = strtod(getConf()[CONF_REPLAYGAIN_PREAMP], &test);
 
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                if(*test != '\0') {
 
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                        ERROR("Replaygain preamp \"%s\" is not a number\n",
 
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                                        getConf()[CONF_REPLAYGAIN_PREAMP]);
 
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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\n", 
 
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                                        getConf()[CONF_REPLAYGAIN_PREAMP]);
 
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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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int getReplayGainState() {
 
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        return replayGainState;
 
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}
 
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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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void doReplayGain(char * buffer, int bufferSize, AudioFormat * format, 
 
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                float scale) 
 
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{
 
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        mpd_sint16 * buffer16 = (mpd_sint16 *)buffer;
 
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        mpd_sint8 * buffer8 = (mpd_sint8 *)buffer;
 
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        mpd_sint32 temp32;
 
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        if(scale == 1.0) return;
 
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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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/* End of added code */