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14 roytam 1 /*
2  * libmad - MPEG audio decoder library
26 roytam 3  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
14 roytam 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  *
26 roytam 19  * $Id: synth.h,v 1.15 2004/01/23 09:41:33 rob Exp $
14 roytam 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