FFmpeg
ac3tab.c
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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 
28 
29 #include "ac3tab.h"
30 
31 /**
32  * Possible frame sizes.
33  * from ATSC A/52 Table 5.18 Frame Size Code Table.
34  */
35 const 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  */
80 const 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  */
88 const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
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 */
95 const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 };
96 
97 /* possible bitrates */
98 const 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  */
107 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
108 
109 /**
110  * Table E2.16 Default Coupling Banding Structure
111  */
112 const 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 
116 const 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 
126 const uint8_t ff_ac3_slow_decay_tab[4]={
127  0x0f, 0x11, 0x13, 0x15,
128 };
129 
130 const uint8_t ff_ac3_fast_decay_tab[4]={
131  0x3f, 0x53, 0x67, 0x7b,
132 };
133 
134 const uint16_t ff_ac3_slow_gain_tab[4]= {
135  0x540, 0x4d8, 0x478, 0x410,
136 };
137 
138 const uint16_t ff_ac3_db_per_bit_tab[4]= {
139  0x000, 0x700, 0x900, 0xb00,
140 };
141 
142 const int16_t ff_ac3_floor_tab[8]= {
143  0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
144 };
145 
146 const uint16_t ff_ac3_fast_gain_tab[8]= {
147  0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
148 };
149 
150 const 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 },
158  { 0, AV_CH_BACK_CENTER },
159  { 0, AV_CH_TOP_CENTER },
163  { 0, AV_CH_TOP_FRONT_CENTER },
165  { 0, AV_CH_LOW_FREQUENCY_2 },
166  { 1, AV_CH_LOW_FREQUENCY },
167 };
ff_ac3_fast_decay_tab
const uint8_t ff_ac3_fast_decay_tab[4]
Definition: ac3tab.c:130
AV_CH_TOP_FRONT_CENTER
#define AV_CH_TOP_FRONT_CENTER
Definition: channel_layout.h:177
AV_CH_LOW_FREQUENCY_2
#define AV_CH_LOW_FREQUENCY_2
Definition: channel_layout.h:188
COMMON_CHANNEL_MAP
#define COMMON_CHANNEL_MAP
Definition: ac3tab.h:64
AV_CH_TOP_FRONT_RIGHT
#define AV_CH_TOP_FRONT_RIGHT
Definition: channel_layout.h:178
ff_ac3_channels_tab
const uint8_t ff_ac3_channels_tab[8]
Map audio coding mode (acmod) to number of full-bandwidth channels.
Definition: ac3tab.c:80
AV_CH_TOP_FRONT_LEFT
#define AV_CH_TOP_FRONT_LEFT
Definition: channel_layout.h:176
AV_CH_WIDE_LEFT
#define AV_CH_WIDE_LEFT
Definition: channel_layout.h:184
AV_CH_SURROUND_DIRECT_RIGHT
#define AV_CH_SURROUND_DIRECT_RIGHT
Definition: channel_layout.h:187
AV_CH_WIDE_RIGHT
#define AV_CH_WIDE_RIGHT
Definition: channel_layout.h:185
AV_CH_TOP_BACK_LEFT
#define AV_CH_TOP_BACK_LEFT
Definition: channel_layout.h:179
AV_CH_BACK_LEFT
#define AV_CH_BACK_LEFT
Definition: channel_layout.h:168
ff_ac3_bap_tab
const uint8_t ff_ac3_bap_tab[64]
Definition: ac3tab.c:116
ff_ac3_dec_channel_map
const uint8_t ff_ac3_dec_channel_map[8][2][6]
Table to remap channels from AC-3 order to SMPTE order.
Definition: ac3tab.c:88
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:167
ff_ac3_floor_tab
const int16_t ff_ac3_floor_tab[8]
Definition: ac3tab.c:142
AV_CH_TOP_CENTER
#define AV_CH_TOP_CENTER
Definition: channel_layout.h:175
AV_CH_FRONT_CENTER
#define AV_CH_FRONT_CENTER
Definition: channel_layout.h:166
AV_CH_FRONT_LEFT_OF_CENTER
#define AV_CH_FRONT_LEFT_OF_CENTER
Definition: channel_layout.h:170
ff_eac3_custom_channel_map_locations
const uint64_t ff_eac3_custom_channel_map_locations[16][2]
Definition: ac3tab.c:150
ff_ac3_db_per_bit_tab
const uint16_t ff_ac3_db_per_bit_tab[4]
Definition: ac3tab.c:138
AV_CH_TOP_BACK_RIGHT
#define AV_CH_TOP_BACK_RIGHT
Definition: channel_layout.h:181
AV_CH_FRONT_RIGHT_OF_CENTER
#define AV_CH_FRONT_RIGHT_OF_CENTER
Definition: channel_layout.h:171
ff_ac3_rematrix_band_tab
const uint8_t ff_ac3_rematrix_band_tab[5]
Table of bin locations for rematrixing bands reference: Section 7.5.2 Rematrixing : Frequency Band De...
Definition: ac3tab.c:107
ff_ac3_sample_rate_tab
const int ff_ac3_sample_rate_tab[]
Definition: ac3tab.c:95
ff_ac3_slow_decay_tab
const uint8_t ff_ac3_slow_decay_tab[4]
Definition: ac3tab.c:126
AV_CH_BACK_CENTER
#define AV_CH_BACK_CENTER
Definition: channel_layout.h:172
AV_CH_FRONT_LEFT
#define AV_CH_FRONT_LEFT
Definition: channel_layout.h:164
AV_CH_SIDE_RIGHT
#define AV_CH_SIDE_RIGHT
Definition: channel_layout.h:174
ff_ac3_frame_size_tab
const uint16_t ff_ac3_frame_size_tab[38][3]
Possible frame sizes.
Definition: ac3tab.c:35
channel_layout.h
ff_ac3_bitrate_tab
const uint16_t ff_ac3_bitrate_tab[19]
Definition: ac3tab.c:98
AV_CH_SURROUND_DIRECT_LEFT
#define AV_CH_SURROUND_DIRECT_LEFT
Definition: channel_layout.h:186
AV_CH_FRONT_RIGHT
#define AV_CH_FRONT_RIGHT
Definition: channel_layout.h:165
ff_ac3_slow_gain_tab
const uint16_t ff_ac3_slow_gain_tab[4]
Definition: ac3tab.c:134
ff_ac3_fast_gain_tab
const uint16_t ff_ac3_fast_gain_tab[8]
Definition: ac3tab.c:146
AV_CH_BACK_RIGHT
#define AV_CH_BACK_RIGHT
Definition: channel_layout.h:169
ac3tab.h
AV_CH_SIDE_LEFT
#define AV_CH_SIDE_LEFT
Definition: channel_layout.h:173
ff_eac3_default_cpl_band_struct
const uint8_t ff_eac3_default_cpl_band_struct[18]
Table E2.16 Default Coupling Banding Structure.
Definition: ac3tab.c:112