libs/mpega/synth.h

   1 /*
   2  * libmad - MPEG audio decoder library
   3  * Copyright (C) 2000-2003 Underbit Technologies, Inc.
   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  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  * $Id$
  20  */
  21
  22 # ifndef LIBMAD_SYNTH_H
  23 # define LIBMAD_SYNTH_H
  24
  25 # include "fixed.h"
  26 # include "frame.h"
  27
  28 struct mad_pcm {
  29   unsigned int samplerate;              /* sampling frequency (Hz) */
  30   unsigned short channels;              /* number of channels */
  31   unsigned short length;                /* number of samples per channel */
  32   mad_fixed_t samples[2][1152];         /* PCM output samples [ch][sample] */
  33 };
  34
  35 struct mad_synth {
  36   mad_fixed_t filter[2][2][2][16][8];   /* polyphase filterbank outputs */
  37                                         /* [ch][eo][peo][s][v] */
  38
  39   unsigned int phase;                   /* current processing phase */
  40
  41   struct mad_pcm pcm;                   /* PCM output */
  42 };
  43
  44 /* single channel PCM selector */
  45 enum {
  46   MAD_PCM_CHANNEL_SINGLE = 0
  47 };
  48
  49 /* dual channel PCM selector */
  50 enum {
  51   MAD_PCM_CHANNEL_DUAL_1 = 0,
  52   MAD_PCM_CHANNEL_DUAL_2 = 1
  53 };
  54
  55 /* stereo PCM selector */
  56 enum {
  57   MAD_PCM_CHANNEL_STEREO_LEFT  = 0,
  58   MAD_PCM_CHANNEL_STEREO_RIGHT = 1
  59 };
  60
  61 void mad_synth_init(struct mad_synth *);
  62
  63 # define mad_synth_finish(synth)  /* nothing */
  64
  65 void mad_synth_mute(struct mad_synth *);
  66
  67 void mad_synth_frame(struct mad_synth *, struct mad_frame const *);
  68
  69 # endif