1 /*
2 * copyright (c) 2001 Fabrice Bellard
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * mpeg audio declarations for both encoder and decoder.
24 */
25
26 #ifndef AVCODEC_MPEGAUDIO_H
27 #define AVCODEC_MPEGAUDIO_H
28
29 #ifndef USE_FLOATS
31 #endif
32
33 #include <stdint.h>
35
36 /* max frame size, in samples */
37 #define MPA_FRAME_SIZE 1152
38
39 /* max compressed frame size */
40 #define MPA_MAX_CODED_FRAME_SIZE 1792
41
42 #define MPA_MAX_CHANNELS 2
43
44 #define SBLIMIT 32 /* number of subbands */
45
50
51 #ifndef FRAC_BITS
52 #define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
53 #define WFRAC_BITS 16 /* fractional bits for window */
54 #endif
55
56 #define IMDCT_SCALAR 1.759
57
58 #define FRAC_ONE (1 << FRAC_BITS)
59
60 #define FIX(a) ((int)((a) * FRAC_ONE))
61
62 #if USE_FLOATS
63 # define INTFLOAT float
64 # define SUINTFLOAT float
67 #elif FRAC_BITS <= 15
68 # define INTFLOAT int
69 # define SUINTFLOAT SUINT
72 #else
74 # define SUINTFLOAT SUINT
77 #endif
78
80
81 #endif /* AVCODEC_MPEGAUDIO_H */