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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 | ||
27 | #include "libavutil/channel_layout.h" | |
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 | */ | |
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] = { | |
90 | AV_CH_LAYOUT_STEREO, | |
91 | AV_CH_LAYOUT_MONO, | |
92 | AV_CH_LAYOUT_STEREO, | |
93 | AV_CH_LAYOUT_SURROUND, | |
94 | AV_CH_LAYOUT_2_1, | |
95 | AV_CH_LAYOUT_4POINT0, | |
96 | AV_CH_LAYOUT_2_2, | |
97 | AV_CH_LAYOUT_5POINT0 | |
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] = { | |
113 | COMMON_CHANNEL_MAP | |
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] = { | |
123 | COMMON_CHANNEL_MAP | |
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 | */ | |
146 | const uint8_t ff_eac3_default_cpl_band_struct[18] = { | |
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 */ | |
153 | DECLARE_ALIGNED(16, const int16_t, ff_ac3_window)[AC3_WINDOW_SIZE/2] = { | |
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 | ||
188 | const uint8_t ff_ac3_log_add_tab[260]= { | |
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 | ||
217 | const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= { | |
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 | ||
270 | const uint8_t ff_ac3_bap_tab[64]= { | |
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 | ||
280 | const uint8_t ff_ac3_slow_decay_tab[4]={ | |
281 | 0x0f, 0x11, 0x13, 0x15, | |
282 | }; | |
283 | ||
284 | const uint8_t ff_ac3_fast_decay_tab[4]={ | |
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, | |
310 | AC3_CHMAP_L | AC3_CHMAP_R, | |
311 | AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R, | |
312 | AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR, | |
313 | AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR, | |
314 | AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR, | |
315 | AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR | |
316 | }; |