FFmpeg
ac3tab.c
Go to the documentation of this file.
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 "ac3.h"
30 #include "ac3tab.h"
31 
32 /**
33  * Possible frame sizes.
34  * from ATSC A/52 Table 5.18 Frame Size Code Table.
35  */
36 const uint16_t ff_ac3_frame_size_tab[38][3] = {
37  { 64, 69, 96 },
38  { 64, 70, 96 },
39  { 80, 87, 120 },
40  { 80, 88, 120 },
41  { 96, 104, 144 },
42  { 96, 105, 144 },
43  { 112, 121, 168 },
44  { 112, 122, 168 },
45  { 128, 139, 192 },
46  { 128, 140, 192 },
47  { 160, 174, 240 },
48  { 160, 175, 240 },
49  { 192, 208, 288 },
50  { 192, 209, 288 },
51  { 224, 243, 336 },
52  { 224, 244, 336 },
53  { 256, 278, 384 },
54  { 256, 279, 384 },
55  { 320, 348, 480 },
56  { 320, 349, 480 },
57  { 384, 417, 576 },
58  { 384, 418, 576 },
59  { 448, 487, 672 },
60  { 448, 488, 672 },
61  { 512, 557, 768 },
62  { 512, 558, 768 },
63  { 640, 696, 960 },
64  { 640, 697, 960 },
65  { 768, 835, 1152 },
66  { 768, 836, 1152 },
67  { 896, 975, 1344 },
68  { 896, 976, 1344 },
69  { 1024, 1114, 1536 },
70  { 1024, 1115, 1536 },
71  { 1152, 1253, 1728 },
72  { 1152, 1254, 1728 },
73  { 1280, 1393, 1920 },
74  { 1280, 1394, 1920 },
75 };
76 
77 /**
78  * Map audio coding mode (acmod) to number of full-bandwidth channels.
79  * from ATSC A/52 Table 5.8 Audio Coding Mode
80  */
81 const uint8_t ff_ac3_channels_tab[8] = {
82  2, 1, 2, 3, 3, 4, 4, 5
83 };
84 
85 /**
86  * Map audio coding mode (acmod) to channel layout mask.
87  */
88 const uint16_t avpriv_ac3_channel_layout_tab[8] = {
97 };
98 
99 /**
100  * Table to remap channels from AC-3 order to SMPTE order.
101  * [channel_mode][lfe][ch]
102  */
103 const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
105  { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } },
106  { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
107 };
108 
109 /* possible frequencies */
110 const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 };
111 
112 /* possible bitrates */
113 const uint16_t ff_ac3_bitrate_tab[19] = {
114  32, 40, 48, 56, 64, 80, 96, 112, 128,
115  160, 192, 224, 256, 320, 384, 448, 512, 576, 640
116 };
117 
118 /**
119  * Table of bin locations for rematrixing bands
120  * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
121  */
122 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
123 
124 /**
125  * Table E2.16 Default Coupling Banding Structure
126  */
127 const uint8_t ff_eac3_default_cpl_band_struct[18] = {
128  0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
129 };
130 
131 const uint8_t ff_ac3_log_add_tab[260]= {
132 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
133 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
134 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
135 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
136 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
137 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
138 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
139 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
140 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
141 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
142 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
143 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
144 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
145 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
146 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
147 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
148 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
149 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
150 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
151 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
152 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
153 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
154 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
155 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
156 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
157 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
158 };
159 
161 { 0x04d0,0x04f0,0x0580 },
162 { 0x04d0,0x04f0,0x0580 },
163 { 0x0440,0x0460,0x04b0 },
164 { 0x0400,0x0410,0x0450 },
165 { 0x03e0,0x03e0,0x0420 },
166 { 0x03c0,0x03d0,0x03f0 },
167 { 0x03b0,0x03c0,0x03e0 },
168 { 0x03b0,0x03b0,0x03d0 },
169 { 0x03a0,0x03b0,0x03c0 },
170 { 0x03a0,0x03a0,0x03b0 },
171 { 0x03a0,0x03a0,0x03b0 },
172 { 0x03a0,0x03a0,0x03b0 },
173 { 0x03a0,0x03a0,0x03a0 },
174 { 0x0390,0x03a0,0x03a0 },
175 { 0x0390,0x0390,0x03a0 },
176 { 0x0390,0x0390,0x03a0 },
177 { 0x0380,0x0390,0x03a0 },
178 { 0x0380,0x0380,0x03a0 },
179 { 0x0370,0x0380,0x03a0 },
180 { 0x0370,0x0380,0x03a0 },
181 { 0x0360,0x0370,0x0390 },
182 { 0x0360,0x0370,0x0390 },
183 { 0x0350,0x0360,0x0390 },
184 { 0x0350,0x0360,0x0390 },
185 { 0x0340,0x0350,0x0380 },
186 { 0x0340,0x0350,0x0380 },
187 { 0x0330,0x0340,0x0380 },
188 { 0x0320,0x0340,0x0370 },
189 { 0x0310,0x0320,0x0360 },
190 { 0x0300,0x0310,0x0350 },
191 { 0x02f0,0x0300,0x0340 },
192 { 0x02f0,0x02f0,0x0330 },
193 { 0x02f0,0x02f0,0x0320 },
194 { 0x02f0,0x02f0,0x0310 },
195 { 0x0300,0x02f0,0x0300 },
196 { 0x0310,0x0300,0x02f0 },
197 { 0x0340,0x0320,0x02f0 },
198 { 0x0390,0x0350,0x02f0 },
199 { 0x03e0,0x0390,0x0300 },
200 { 0x0420,0x03e0,0x0310 },
201 { 0x0460,0x0420,0x0330 },
202 { 0x0490,0x0450,0x0350 },
203 { 0x04a0,0x04a0,0x03c0 },
204 { 0x0460,0x0490,0x0410 },
205 { 0x0440,0x0460,0x0470 },
206 { 0x0440,0x0440,0x04a0 },
207 { 0x0520,0x0480,0x0460 },
208 { 0x0800,0x0630,0x0440 },
209 { 0x0840,0x0840,0x0450 },
210 { 0x0840,0x0840,0x04e0 },
211 };
212 
213 const uint8_t ff_ac3_bap_tab[64]= {
214  0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
215  3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
216  7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
217  9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
218  12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
219  14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
220  15, 15, 15, 15,
221 };
222 
223 const uint8_t ff_ac3_slow_decay_tab[4]={
224  0x0f, 0x11, 0x13, 0x15,
225 };
226 
227 const uint8_t ff_ac3_fast_decay_tab[4]={
228  0x3f, 0x53, 0x67, 0x7b,
229 };
230 
231 const uint16_t ff_ac3_slow_gain_tab[4]= {
232  0x540, 0x4d8, 0x478, 0x410,
233 };
234 
235 const uint16_t ff_ac3_db_per_bit_tab[4]= {
236  0x000, 0x700, 0x900, 0xb00,
237 };
238 
239 const int16_t ff_ac3_floor_tab[8]= {
240  0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
241 };
242 
243 const uint16_t ff_ac3_fast_gain_tab[8]= {
244  0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
245 };
246 
247 const uint64_t ff_eac3_custom_channel_map_locations[16][2] = {
248  { 1, AV_CH_FRONT_LEFT },
249  { 1, AV_CH_FRONT_CENTER },
250  { 1, AV_CH_FRONT_RIGHT },
251  { 1, AV_CH_SIDE_LEFT },
252  { 1, AV_CH_SIDE_RIGHT },
255  { 0, AV_CH_BACK_CENTER },
256  { 0, AV_CH_TOP_CENTER },
260  { 0, AV_CH_TOP_FRONT_CENTER },
262  { 0, AV_CH_LOW_FREQUENCY_2 },
263  { 1, AV_CH_LOW_FREQUENCY },
264 };
ff_ac3_fast_decay_tab
const uint8_t ff_ac3_fast_decay_tab[4]
Definition: ac3tab.c:227
AV_CH_TOP_FRONT_CENTER
#define AV_CH_TOP_FRONT_CENTER
Definition: channel_layout.h:62
AV_CH_LOW_FREQUENCY_2
#define AV_CH_LOW_FREQUENCY_2
Definition: channel_layout.h:73
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
COMMON_CHANNEL_MAP
#define COMMON_CHANNEL_MAP
Definition: ac3tab.h:68
AV_CH_TOP_FRONT_RIGHT
#define AV_CH_TOP_FRONT_RIGHT
Definition: channel_layout.h:63
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:81
AV_CH_TOP_FRONT_LEFT
#define AV_CH_TOP_FRONT_LEFT
Definition: channel_layout.h:61
AC3_CRITICAL_BANDS
#define AC3_CRITICAL_BANDS
Definition: ac3.h:42
AV_CH_WIDE_LEFT
#define AV_CH_WIDE_LEFT
Definition: channel_layout.h:69
AV_CH_SURROUND_DIRECT_RIGHT
#define AV_CH_SURROUND_DIRECT_RIGHT
Definition: channel_layout.h:72
AV_CH_WIDE_RIGHT
#define AV_CH_WIDE_RIGHT
Definition: channel_layout.h:70
AV_CH_TOP_BACK_LEFT
#define AV_CH_TOP_BACK_LEFT
Definition: channel_layout.h:64
AV_CH_BACK_LEFT
#define AV_CH_BACK_LEFT
Definition: channel_layout.h:53
ff_ac3_bap_tab
const uint8_t ff_ac3_bap_tab[64]
Definition: ac3tab.c:213
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:103
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
ff_ac3_log_add_tab
const uint8_t ff_ac3_log_add_tab[260]
Definition: ac3tab.c:131
AV_CH_LOW_FREQUENCY
#define AV_CH_LOW_FREQUENCY
Definition: channel_layout.h:52
ff_ac3_floor_tab
const int16_t ff_ac3_floor_tab[8]
Definition: ac3tab.c:239
AV_CH_LAYOUT_2_1
#define AV_CH_LAYOUT_2_1
Definition: channel_layout.h:93
AV_CH_TOP_CENTER
#define AV_CH_TOP_CENTER
Definition: channel_layout.h:60
AV_CH_FRONT_CENTER
#define AV_CH_FRONT_CENTER
Definition: channel_layout.h:51
AV_CH_FRONT_LEFT_OF_CENTER
#define AV_CH_FRONT_LEFT_OF_CENTER
Definition: channel_layout.h:55
ff_eac3_custom_channel_map_locations
const uint64_t ff_eac3_custom_channel_map_locations[16][2]
Definition: ac3tab.c:247
ff_ac3_db_per_bit_tab
const uint16_t ff_ac3_db_per_bit_tab[4]
Definition: ac3tab.c:235
ff_ac3_hearing_threshold_tab
const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]
Definition: ac3tab.c:160
AV_CH_TOP_BACK_RIGHT
#define AV_CH_TOP_BACK_RIGHT
Definition: channel_layout.h:66
AV_CH_FRONT_RIGHT_OF_CENTER
#define AV_CH_FRONT_RIGHT_OF_CENTER
Definition: channel_layout.h:56
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:122
AV_CH_LAYOUT_5POINT0
#define AV_CH_LAYOUT_5POINT0
Definition: channel_layout.h:100
ff_ac3_sample_rate_tab
const int ff_ac3_sample_rate_tab[]
Definition: ac3tab.c:110
avpriv_ac3_channel_layout_tab
const uint16_t avpriv_ac3_channel_layout_tab[8]
Map audio coding mode (acmod) to channel layout mask.
Definition: ac3tab.c:88
ff_ac3_slow_decay_tab
const uint8_t ff_ac3_slow_decay_tab[4]
Definition: ac3tab.c:223
AV_CH_BACK_CENTER
#define AV_CH_BACK_CENTER
Definition: channel_layout.h:57
AV_CH_FRONT_LEFT
#define AV_CH_FRONT_LEFT
Definition: channel_layout.h:49
AV_CH_SIDE_RIGHT
#define AV_CH_SIDE_RIGHT
Definition: channel_layout.h:59
ff_ac3_frame_size_tab
const uint16_t ff_ac3_frame_size_tab[38][3]
Possible frame sizes.
Definition: ac3tab.c:36
AV_CH_LAYOUT_SURROUND
#define AV_CH_LAYOUT_SURROUND
Definition: channel_layout.h:94
channel_layout.h
ff_ac3_bitrate_tab
const uint16_t ff_ac3_bitrate_tab[19]
Definition: ac3tab.c:113
AV_CH_SURROUND_DIRECT_LEFT
#define AV_CH_SURROUND_DIRECT_LEFT
Definition: channel_layout.h:71
AV_CH_FRONT_RIGHT
#define AV_CH_FRONT_RIGHT
Definition: channel_layout.h:50
ff_ac3_slow_gain_tab
const uint16_t ff_ac3_slow_gain_tab[4]
Definition: ac3tab.c:231
ac3.h
ff_ac3_fast_gain_tab
const uint16_t ff_ac3_fast_gain_tab[8]
Definition: ac3tab.c:243
AV_CH_LAYOUT_4POINT0
#define AV_CH_LAYOUT_4POINT0
Definition: channel_layout.h:96
AV_CH_BACK_RIGHT
#define AV_CH_BACK_RIGHT
Definition: channel_layout.h:54
ac3tab.h
AV_CH_LAYOUT_2_2
#define AV_CH_LAYOUT_2_2
Definition: channel_layout.h:98
AV_CH_SIDE_LEFT
#define AV_CH_SIDE_LEFT
Definition: channel_layout.h:58
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:127