xref: /third_party/ffmpeg/libavcodec/ac3tab.c (revision cabdff1a) 
1/*
2 * AC-3 tables
3 * copyright (c) 2001 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/**
23 * @file
24 * tables taken directly from the AC-3 spec.
25 */
26
27#include "libavutil/channel_layout.h"
28
29#include "ac3tab.h"
30
31/**
32 * Possible frame sizes.
33 * from ATSC A/52 Table 5.18 Frame Size Code Table.
34 */
35const uint16_t ff_ac3_frame_size_tab[38][3] = {
36    { 64,   69,   96   },
37    { 64,   70,   96   },
38    { 80,   87,   120  },
39    { 80,   88,   120  },
40    { 96,   104,  144  },
41    { 96,   105,  144  },
42    { 112,  121,  168  },
43    { 112,  122,  168  },
44    { 128,  139,  192  },
45    { 128,  140,  192  },
46    { 160,  174,  240  },
47    { 160,  175,  240  },
48    { 192,  208,  288  },
49    { 192,  209,  288  },
50    { 224,  243,  336  },
51    { 224,  244,  336  },
52    { 256,  278,  384  },
53    { 256,  279,  384  },
54    { 320,  348,  480  },
55    { 320,  349,  480  },
56    { 384,  417,  576  },
57    { 384,  418,  576  },
58    { 448,  487,  672  },
59    { 448,  488,  672  },
60    { 512,  557,  768  },
61    { 512,  558,  768  },
62    { 640,  696,  960  },
63    { 640,  697,  960  },
64    { 768,  835,  1152 },
65    { 768,  836,  1152 },
66    { 896,  975,  1344 },
67    { 896,  976,  1344 },
68    { 1024, 1114, 1536 },
69    { 1024, 1115, 1536 },
70    { 1152, 1253, 1728 },
71    { 1152, 1254, 1728 },
72    { 1280, 1393, 1920 },
73    { 1280, 1394, 1920 },
74};
75
76/**
77 * Map audio coding mode (acmod) to number of full-bandwidth channels.
78 * from ATSC A/52 Table 5.8 Audio Coding Mode
79 */
80const uint8_t ff_ac3_channels_tab[8] = {
81    2, 1, 2, 3, 3, 4, 4, 5
82};
83
84/**
85 * Table to remap channels from AC-3 order to SMPTE order.
86 * [channel_mode][lfe][ch]
87 */
88const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
89    COMMON_CHANNEL_MAP
90    { { 0, 1, 2, 3,    }, { 0, 1, 4, 2, 3,   } },
91    { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
92};
93
94/* possible frequencies */
95const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 };
96
97/* possible bitrates */
98const uint16_t ff_ac3_bitrate_tab[19] = {
99    32, 40, 48, 56, 64, 80, 96, 112, 128,
100    160, 192, 224, 256, 320, 384, 448, 512, 576, 640
101};
102
103/**
104 * Table of bin locations for rematrixing bands
105 * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
106 */
107const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
108
109/**
110 * Table E2.16 Default Coupling Banding Structure
111 */
112const uint8_t ff_eac3_default_cpl_band_struct[18] = {
113    0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
114};
115
116const uint8_t ff_ac3_bap_tab[64]= {
117    0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
118    3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
119    7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
120    9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
121    12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
122    14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
123    15, 15, 15, 15,
124};
125
126const uint8_t ff_ac3_slow_decay_tab[4]={
127    0x0f, 0x11, 0x13, 0x15,
128};
129
130const uint8_t ff_ac3_fast_decay_tab[4]={
131    0x3f, 0x53, 0x67, 0x7b,
132};
133
134const uint16_t ff_ac3_slow_gain_tab[4]= {
135    0x540, 0x4d8, 0x478, 0x410,
136};
137
138const uint16_t ff_ac3_db_per_bit_tab[4]= {
139    0x000, 0x700, 0x900, 0xb00,
140};
141
142const int16_t ff_ac3_floor_tab[8]= {
143    0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
144};
145
146const uint16_t ff_ac3_fast_gain_tab[8]= {
147    0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
148};
149
150const uint64_t ff_eac3_custom_channel_map_locations[16][2] = {
151    { 1, AV_CH_FRONT_LEFT },
152    { 1, AV_CH_FRONT_CENTER },
153    { 1, AV_CH_FRONT_RIGHT },
154    { 1, AV_CH_SIDE_LEFT },
155    { 1, AV_CH_SIDE_RIGHT },
156    { 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER },
157    { 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT },
158    { 0, AV_CH_BACK_CENTER },
159    { 0, AV_CH_TOP_CENTER },
160    { 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT },
161    { 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT },
162    { 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT},
163    { 0, AV_CH_TOP_FRONT_CENTER },
164    { 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT },
165    { 0, AV_CH_LOW_FREQUENCY_2 },
166    { 1, AV_CH_LOW_FREQUENCY },
167};
168