src/normalize.c

   1 /* the Music Player Daemon (MPD)
   2  * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
   3  * This project's homepage is: http://www.musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include "compress.h"
  20 #include "conf.h"
  21 #include "normalize.h"
  22
  23 #include <stdlib.h>
  24
  25 #define DEFAULT_VOLUME_NORMALIZATION 0
  26
  27 int normalizationEnabled;
  28
  29 void initNormalization(void)
  30 {
  31         normalizationEnabled = getBoolConfigParam(CONF_VOLUME_NORMALIZATION);
  32         if (normalizationEnabled == -1)
  33                 normalizationEnabled = DEFAULT_VOLUME_NORMALIZATION;
  34         else if (normalizationEnabled < 0)
  35                 exit(EXIT_FAILURE);
  36
  37         if (normalizationEnabled)
  38                 CompressCfg(0, ANTICLIP, TARGET, GAINMAX, GAINSMOOTH, BUCKETS);
  39 }
  40
  41 void finishNormalization(void)
  42 {
  43         if (normalizationEnabled) CompressFree();
  44 }
  45
  46 void normalizeData(char *buffer, int bufferSize, AudioFormat *format)
  47 {
  48         if ((format->bits != 16) || (format->channels != 2)) return;
  49
  50         CompressDo(buffer, bufferSize);
  51 }