src/pcm_utils.h

   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 #ifndef PCM_UTILS_H
  20 #define PCM_UTILS_H
  21
  22 #include "../config.h"
  23
  24 #include "audio.h"
  25
  26 #include <stdlib.h>
  27
  28 #ifdef HAVE_LIBSAMPLERATE
  29 #include <samplerate.h>
  30 #endif
  31
  32 typedef struct _ConvState {
  33 #ifdef HAVE_LIBSAMPLERATE
  34         SRC_STATE *state;
  35         SRC_DATA data;
  36         size_t dataInSize;
  37         size_t dataOutSize;
  38         mpd_sint8 lastChannels;
  39         mpd_sint32 lastInSampleRate;
  40         mpd_sint32 lastOutSampleRate;
  41         int error;
  42 #endif
  43 } ConvState;
  44
  45 void pcm_volumeChange(char *buffer, int bufferSize, AudioFormat * format,
  46                       int volume);
  47
  48 void pcm_mix(char *buffer1, char *buffer2, size_t bufferSize1,
  49              size_t bufferSize2, AudioFormat * format, float portion1);
  50
  51 size_t pcm_convertAudioFormat(AudioFormat * inFormat, char *inBuffer,
  52                               size_t inSize, AudioFormat * outFormat,
  53                               char *outBuffer, ConvState *convState);
  54
  55 size_t pcm_sizeOfConvBuffer(AudioFormat * inFormat, size_t inSize,
  56                             AudioFormat * outFormat);
  57 #endif