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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 #include "libavutil/mem.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  */
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 #define COMMON_CHANNEL_MAP \
101  { { 0, 1, }, { 0, 1, 2, } },\
102  { { 0, }, { 0, 1, } },\
103  { { 0, 1, }, { 0, 1, 2, } },\
104  { { 0, 2, 1, }, { 0, 2, 1, 3, } },\
105  { { 0, 1, 2, }, { 0, 1, 3, 2, } },\
106  { { 0, 2, 1, 3, }, { 0, 2, 1, 4, 3, } },
107 
108 /**
109  * Table to remap channels from SMPTE order to AC-3 order.
110  * [channel_mode][lfe][ch]
111  */
112 const uint8_t ff_ac3_enc_channel_map[8][2][6] = {
114  { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } },
115  { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
116 };
117 
118 /**
119  * Table to remap channels from AC-3 order to SMPTE order.
120  * [channel_mode][lfe][ch]
121  */
122 const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
124  { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } },
125  { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
126 };
127 
128 /* possible frequencies */
129 const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };
130 
131 /* possible bitrates */
132 const uint16_t ff_ac3_bitrate_tab[19] = {
133  32, 40, 48, 56, 64, 80, 96, 112, 128,
134  160, 192, 224, 256, 320, 384, 448, 512, 576, 640
135 };
136 
137 /**
138  * Table of bin locations for rematrixing bands
139  * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
140  */
141 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
142 
143 /**
144  * Table E2.16 Default Coupling Banding Structure
145  */
147  0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
148 };
149 
150 /* AC-3 MDCT window */
151 
152 /* MDCT window */
154  4, 7, 12, 16, 21, 28, 34, 42,
155  51, 61, 72, 84, 97, 111, 127, 145,
156  164, 184, 207, 231, 257, 285, 315, 347,
157  382, 419, 458, 500, 544, 591, 641, 694,
158  750, 810, 872, 937, 1007, 1079, 1155, 1235,
159  1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
160  2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
161  3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
162  4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
163  6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
164  8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
165 10660,10960,11264,11570,11879,12190,12504,12820,
166 13138,13458,13780,14103,14427,14753,15079,15407,
167 15735,16063,16392,16720,17049,17377,17705,18032,
168 18358,18683,19007,19330,19651,19970,20287,20602,
169 20914,21225,21532,21837,22139,22438,22733,23025,
170 23314,23599,23880,24157,24430,24699,24964,25225,
171 25481,25732,25979,26221,26459,26691,26919,27142,
172 27359,27572,27780,27983,28180,28373,28560,28742,
173 28919,29091,29258,29420,29577,29729,29876,30018,
174 30155,30288,30415,30538,30657,30771,30880,30985,
175 31086,31182,31274,31363,31447,31528,31605,31678,
176 31747,31814,31877,31936,31993,32046,32097,32145,
177 32190,32232,32272,32310,32345,32378,32409,32438,
178 32465,32490,32513,32535,32556,32574,32592,32608,
179 32623,32636,32649,32661,32671,32681,32690,32698,
180 32705,32712,32718,32724,32729,32733,32737,32741,
181 32744,32747,32750,32752,32754,32756,32757,32759,
182 32760,32761,32762,32763,32764,32764,32765,32765,
183 32766,32766,32766,32766,32767,32767,32767,32767,
184 32767,32767,32767,32767,32767,32767,32767,32767,
185 32767,32767,32767,32767,32767,32767,32767,32767,
186 };
187 
189 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
190 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
191 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
192 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
193 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
194 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
195 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
196 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
197 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
198 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
199 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
200 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
201 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
202 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
203 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
204 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
205 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
206 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
207 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
208 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
209 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
210 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
211 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
212 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
213 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
214 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
215 };
216 
218 { 0x04d0,0x04f0,0x0580 },
219 { 0x04d0,0x04f0,0x0580 },
220 { 0x0440,0x0460,0x04b0 },
221 { 0x0400,0x0410,0x0450 },
222 { 0x03e0,0x03e0,0x0420 },
223 { 0x03c0,0x03d0,0x03f0 },
224 { 0x03b0,0x03c0,0x03e0 },
225 { 0x03b0,0x03b0,0x03d0 },
226 { 0x03a0,0x03b0,0x03c0 },
227 { 0x03a0,0x03a0,0x03b0 },
228 { 0x03a0,0x03a0,0x03b0 },
229 { 0x03a0,0x03a0,0x03b0 },
230 { 0x03a0,0x03a0,0x03a0 },
231 { 0x0390,0x03a0,0x03a0 },
232 { 0x0390,0x0390,0x03a0 },
233 { 0x0390,0x0390,0x03a0 },
234 { 0x0380,0x0390,0x03a0 },
235 { 0x0380,0x0380,0x03a0 },
236 { 0x0370,0x0380,0x03a0 },
237 { 0x0370,0x0380,0x03a0 },
238 { 0x0360,0x0370,0x0390 },
239 { 0x0360,0x0370,0x0390 },
240 { 0x0350,0x0360,0x0390 },
241 { 0x0350,0x0360,0x0390 },
242 { 0x0340,0x0350,0x0380 },
243 { 0x0340,0x0350,0x0380 },
244 { 0x0330,0x0340,0x0380 },
245 { 0x0320,0x0340,0x0370 },
246 { 0x0310,0x0320,0x0360 },
247 { 0x0300,0x0310,0x0350 },
248 { 0x02f0,0x0300,0x0340 },
249 { 0x02f0,0x02f0,0x0330 },
250 { 0x02f0,0x02f0,0x0320 },
251 { 0x02f0,0x02f0,0x0310 },
252 { 0x0300,0x02f0,0x0300 },
253 { 0x0310,0x0300,0x02f0 },
254 { 0x0340,0x0320,0x02f0 },
255 { 0x0390,0x0350,0x02f0 },
256 { 0x03e0,0x0390,0x0300 },
257 { 0x0420,0x03e0,0x0310 },
258 { 0x0460,0x0420,0x0330 },
259 { 0x0490,0x0450,0x0350 },
260 { 0x04a0,0x04a0,0x03c0 },
261 { 0x0460,0x0490,0x0410 },
262 { 0x0440,0x0460,0x0470 },
263 { 0x0440,0x0440,0x04a0 },
264 { 0x0520,0x0480,0x0460 },
265 { 0x0800,0x0630,0x0440 },
266 { 0x0840,0x0840,0x0450 },
267 { 0x0840,0x0840,0x04e0 },
268 };
269 
271  0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
272  3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
273  7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
274  9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
275  12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
276  14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
277  15, 15, 15, 15,
278 };
279 
281  0x0f, 0x11, 0x13, 0x15,
282 };
283 
285  0x3f, 0x53, 0x67, 0x7b,
286 };
287 
288 const uint16_t ff_ac3_slow_gain_tab[4]= {
289  0x540, 0x4d8, 0x478, 0x410,
290 };
291 
292 const uint16_t ff_ac3_db_per_bit_tab[4]= {
293  0x000, 0x700, 0x900, 0xb00,
294 };
295 
296 const int16_t ff_ac3_floor_tab[8]= {
297  0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
298 };
299 
300 const uint16_t ff_ac3_fast_gain_tab[8]= {
301  0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
302 };
303 
304 /**
305  * Default channel map for a dependent substream defined by acmod
306  */
307 const uint16_t ff_eac3_default_chmap[8] = {
308  AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2
309  AC3_CHMAP_C,
311  AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
313  AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
316 };
const uint8_t ff_ac3_bap_tab[64]
Definition: ac3tab.c:270
const uint8_t ff_ac3_slow_decay_tab[4]
Definition: ac3tab.c:280
#define COMMON_CHANNEL_MAP
Definition: ac3tab.c:100
#define AV_CH_LAYOUT_SURROUND
Memory handling functions.
const uint16_t ff_ac3_frame_size_tab[38][3]
Possible frame sizes.
Definition: ac3tab.c:37
#define AC3_WINDOW_SIZE
Definition: ac3.h:38
const uint16_t ff_ac3_sample_rate_tab[3]
Definition: ac3tab.c:129
#define AV_CH_LAYOUT_4POINT0
#define AV_CH_LAYOUT_STEREO
const uint16_t ff_ac3_slow_gain_tab[4]
Definition: ac3tab.c:288
#define AV_CH_LAYOUT_5POINT0
uint8_t
const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]
Definition: ac3tab.c:217
const uint8_t ff_ac3_enc_channel_map[8][2][6]
Table to remap channels from SMPTE order to AC-3 order.
Definition: ac3tab.c:112
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
const int16_t ff_ac3_window[AC3_WINDOW_SIZE/2]
Definition: ac3tab.c:153
const uint16_t avpriv_ac3_channel_layout_tab[8]
Map audio coding mode (acmod) to channel layout mask.
Definition: ac3tab.c:89
const uint8_t ff_ac3_fast_decay_tab[4]
Definition: ac3tab.c:284
const uint16_t ff_ac3_bitrate_tab[19]
Definition: ac3tab.c:132
#define AV_CH_LAYOUT_2_1
#define AV_CH_LAYOUT_2_2
audio channel layout utility functions
const uint16_t ff_eac3_default_chmap[8]
Default channel map for a dependent substream defined by acmod.
Definition: ac3tab.c:307
const uint16_t ff_ac3_fast_gain_tab[8]
Definition: ac3tab.c:300
const uint8_t ff_eac3_default_cpl_band_struct[18]
Table E2.16 Default Coupling Banding Structure.
Definition: ac3tab.c:146
Libavcodec external API header.
const uint8_t ff_ac3_log_add_tab[260]
Definition: ac3tab.c:188
#define AC3_CRITICAL_BANDS
Definition: ac3.h:39
const int16_t ff_ac3_floor_tab[8]
Definition: ac3tab.c:296
const uint8_t ff_ac3_channels_tab[8]
Map audio coding mode (acmod) to number of full-bandwidth channels.
Definition: ac3tab.c:82
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:141
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:122
const uint16_t ff_ac3_db_per_bit_tab[4]
Definition: ac3tab.c:292
#define AV_CH_LAYOUT_MONO