1 /*
2 * Common AC-3 definitions
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #ifndef AVCODEC_AC3DEFS_H
23 #define AVCODEC_AC3DEFS_H
24
25 #define EAC3_MAX_CHANNELS 16 /**< maximum number of channels in EAC3 */
26 #define AC3_MAX_CHANNELS 7 /**< maximum number of channels, including coupling channel */
27 #define CPL_CH 0 /**< coupling channel index */
28
29 #define AC3_MAX_COEFS 256
30 #define AC3_BLOCK_SIZE 256
31 #define AC3_MAX_BLOCKS 6
32 #define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256)
33 #define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2)
34 #define AC3_CRITICAL_BANDS 50
35 #define AC3_MAX_CPL_BANDS 18
36
37 /* exponent encoding strategy */
40
44
45 /** Delta bit allocation strategy */
52
53 /** Channel mode (audio coding mode) */
64
65 /** Dolby Surround mode */
72
73 /** Dolby Surround EX mode */
80
81 /** Dolby Headphone mode */
88
89 /** Preferred Stereo Downmix mode */
96
103
104 #endif /* AVCODEC_AC3DEFS_H */