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 #include "libavutil/mem_internal.h"
29 
30 #include "avcodec.h"
31 #include "ac3tab.h"
32 
33 /**
34  * Possible frame sizes.
35  * from ATSC A/52 Table 5.18 Frame Size Code Table.
36  */
37 const uint16_t ff_ac3_frame_size_tab[38][3] = {
38  { 64, 69, 96 },
39  { 64, 70, 96 },
40  { 80, 87, 120 },
41  { 80, 88, 120 },
42  { 96, 104, 144 },
43  { 96, 105, 144 },
44  { 112, 121, 168 },
45  { 112, 122, 168 },
46  { 128, 139, 192 },
47  { 128, 140, 192 },
48  { 160, 174, 240 },
49  { 160, 175, 240 },
50  { 192, 208, 288 },
51  { 192, 209, 288 },
52  { 224, 243, 336 },
53  { 224, 244, 336 },
54  { 256, 278, 384 },
55  { 256, 279, 384 },
56  { 320, 348, 480 },
57  { 320, 349, 480 },
58  { 384, 417, 576 },
59  { 384, 418, 576 },
60  { 448, 487, 672 },
61  { 448, 488, 672 },
62  { 512, 557, 768 },
63  { 512, 558, 768 },
64  { 640, 696, 960 },
65  { 640, 697, 960 },
66  { 768, 835, 1152 },
67  { 768, 836, 1152 },
68  { 896, 975, 1344 },
69  { 896, 976, 1344 },
70  { 1024, 1114, 1536 },
71  { 1024, 1115, 1536 },
72  { 1152, 1253, 1728 },
73  { 1152, 1254, 1728 },
74  { 1280, 1393, 1920 },
75  { 1280, 1394, 1920 },
76 };
77 
78 /**
79  * Map audio coding mode (acmod) to number of full-bandwidth channels.
80  * from ATSC A/52 Table 5.8 Audio Coding Mode
81  */
82 const uint8_t ff_ac3_channels_tab[8] = {
83  2, 1, 2, 3, 3, 4, 4, 5
84 };
85 
86 /**
87  * Map audio coding mode (acmod) to channel layout mask.
88  */
89 const uint16_t avpriv_ac3_channel_layout_tab[8] = {
98 };
99 
100 /**
101  * Table to remap channels from AC-3 order to SMPTE order.
102  * [channel_mode][lfe][ch]
103  */
104 const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
106  { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } },
107  { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
108 };
109 
110 /* possible frequencies */
111 const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 };
112 
113 /* possible bitrates */
114 const uint16_t ff_ac3_bitrate_tab[19] = {
115  32, 40, 48, 56, 64, 80, 96, 112, 128,
116  160, 192, 224, 256, 320, 384, 448, 512, 576, 640
117 };
118 
119 /**
120  * Table of bin locations for rematrixing bands
121  * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
122  */
123 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
124 
125 /**
126  * Table E2.16 Default Coupling Banding Structure
127  */
128 const uint8_t ff_eac3_default_cpl_band_struct[18] = {
129  0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
130 };
131 
132 const uint8_t ff_ac3_log_add_tab[260]= {
133 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
134 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
135 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
136 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
137 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
138 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
139 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
140 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
141 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
142 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
143 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
144 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
145 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
146 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
147 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
148 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
149 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
150 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
151 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
152 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
153 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
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 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
159 };
160 
162 { 0x04d0,0x04f0,0x0580 },
163 { 0x04d0,0x04f0,0x0580 },
164 { 0x0440,0x0460,0x04b0 },
165 { 0x0400,0x0410,0x0450 },
166 { 0x03e0,0x03e0,0x0420 },
167 { 0x03c0,0x03d0,0x03f0 },
168 { 0x03b0,0x03c0,0x03e0 },
169 { 0x03b0,0x03b0,0x03d0 },
170 { 0x03a0,0x03b0,0x03c0 },
171 { 0x03a0,0x03a0,0x03b0 },
172 { 0x03a0,0x03a0,0x03b0 },
173 { 0x03a0,0x03a0,0x03b0 },
174 { 0x03a0,0x03a0,0x03a0 },
175 { 0x0390,0x03a0,0x03a0 },
176 { 0x0390,0x0390,0x03a0 },
177 { 0x0390,0x0390,0x03a0 },
178 { 0x0380,0x0390,0x03a0 },
179 { 0x0380,0x0380,0x03a0 },
180 { 0x0370,0x0380,0x03a0 },
181 { 0x0370,0x0380,0x03a0 },
182 { 0x0360,0x0370,0x0390 },
183 { 0x0360,0x0370,0x0390 },
184 { 0x0350,0x0360,0x0390 },
185 { 0x0350,0x0360,0x0390 },
186 { 0x0340,0x0350,0x0380 },
187 { 0x0340,0x0350,0x0380 },
188 { 0x0330,0x0340,0x0380 },
189 { 0x0320,0x0340,0x0370 },
190 { 0x0310,0x0320,0x0360 },
191 { 0x0300,0x0310,0x0350 },
192 { 0x02f0,0x0300,0x0340 },
193 { 0x02f0,0x02f0,0x0330 },
194 { 0x02f0,0x02f0,0x0320 },
195 { 0x02f0,0x02f0,0x0310 },
196 { 0x0300,0x02f0,0x0300 },
197 { 0x0310,0x0300,0x02f0 },
198 { 0x0340,0x0320,0x02f0 },
199 { 0x0390,0x0350,0x02f0 },
200 { 0x03e0,0x0390,0x0300 },
201 { 0x0420,0x03e0,0x0310 },
202 { 0x0460,0x0420,0x0330 },
203 { 0x0490,0x0450,0x0350 },
204 { 0x04a0,0x04a0,0x03c0 },
205 { 0x0460,0x0490,0x0410 },
206 { 0x0440,0x0460,0x0470 },
207 { 0x0440,0x0440,0x04a0 },
208 { 0x0520,0x0480,0x0460 },
209 { 0x0800,0x0630,0x0440 },
210 { 0x0840,0x0840,0x0450 },
211 { 0x0840,0x0840,0x04e0 },
212 };
213 
214 const uint8_t ff_ac3_bap_tab[64]= {
215  0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
216  3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
217  7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
218  9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
219  12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
220  14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
221  15, 15, 15, 15,
222 };
223 
224 const uint8_t ff_ac3_slow_decay_tab[4]={
225  0x0f, 0x11, 0x13, 0x15,
226 };
227 
228 const uint8_t ff_ac3_fast_decay_tab[4]={
229  0x3f, 0x53, 0x67, 0x7b,
230 };
231 
232 const uint16_t ff_ac3_slow_gain_tab[4]= {
233  0x540, 0x4d8, 0x478, 0x410,
234 };
235 
236 const uint16_t ff_ac3_db_per_bit_tab[4]= {
237  0x000, 0x700, 0x900, 0xb00,
238 };
239 
240 const int16_t ff_ac3_floor_tab[8]= {
241  0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
242 };
243 
244 const uint16_t ff_ac3_fast_gain_tab[8]= {
245  0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
246 };
247 
248 const uint64_t ff_eac3_custom_channel_map_locations[16][2] = {
249  { 1, AV_CH_FRONT_LEFT },
250  { 1, AV_CH_FRONT_CENTER },
251  { 1, AV_CH_FRONT_RIGHT },
252  { 1, AV_CH_SIDE_LEFT },
253  { 1, AV_CH_SIDE_RIGHT },
256  { 0, AV_CH_BACK_CENTER },
257  { 0, AV_CH_TOP_CENTER },
261  { 0, AV_CH_TOP_FRONT_CENTER },
263  { 0, AV_CH_LOW_FREQUENCY_2 },
264  { 1, AV_CH_LOW_FREQUENCY },
265 };
ff_ac3_fast_decay_tab
const uint8_t ff_ac3_fast_decay_tab[4]
Definition: ac3tab.c:228
mem_internal.h
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:82
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:39
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:214
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:104
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:132
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:240
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:248
ff_ac3_db_per_bit_tab
const uint16_t ff_ac3_db_per_bit_tab[4]
Definition: ac3tab.c:236
ff_ac3_hearing_threshold_tab
const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]
Definition: ac3tab.c:161
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:123
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:111
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:89
ff_ac3_slow_decay_tab
const uint8_t ff_ac3_slow_decay_tab[4]
Definition: ac3tab.c:224
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:37
avcodec.h
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:114
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:232
ff_ac3_fast_gain_tab
const uint16_t ff_ac3_fast_gain_tab[8]
Definition: ac3tab.c:244
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:128