3 * copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 * tables taken directly from the AC-3 spec.
27 #include "libavutil/channel_layout.h"
32 * Possible frame sizes.
33 * from ATSC A/52 Table 5.18 Frame Size Code Table.
35 const uint16_t ff_ac3_frame_size_tab[38][3] = {
77 * Map audio coding mode (acmod) to number of full-bandwidth channels.
78 * from ATSC A/52 Table 5.8 Audio Coding Mode
80 const uint8_t ff_ac3_channels_tab[8] = {
81 2, 1, 2, 3, 3, 4, 4, 5
85 * Map audio coding mode (acmod) to channel layout mask.
87 const uint16_t avpriv_ac3_channel_layout_tab[8] = {
91 AV_CH_LAYOUT_SURROUND,
98 #define COMMON_CHANNEL_MAP \
99 { { 0, 1, }, { 0, 1, 2, } },\
100 { { 0, }, { 0, 1, } },\
101 { { 0, 1, }, { 0, 1, 2, } },\
102 { { 0, 2, 1, }, { 0, 2, 1, 3, } },\
103 { { 0, 1, 2, }, { 0, 1, 3, 2, } },\
104 { { 0, 2, 1, 3, }, { 0, 2, 1, 4, 3, } },
107 * Table to remap channels from SMPTE order to AC-3 order.
108 * [channel_mode][lfe][ch]
110 const uint8_t ff_ac3_enc_channel_map[8][2][6] = {
112 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } },
113 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
117 * Table to remap channels from AC-3 order to SMPTE order.
118 * [channel_mode][lfe][ch]
120 const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
122 { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } },
123 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
126 /* possible frequencies */
127 const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };
129 /* possible bitrates */
130 const uint16_t ff_ac3_bitrate_tab[19] = {
131 32, 40, 48, 56, 64, 80, 96, 112, 128,
132 160, 192, 224, 256, 320, 384, 448, 512, 576, 640
136 * Table of bin locations for rematrixing bands
137 * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
139 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
142 * Table E2.16 Default Coupling Banding Structure
144 const uint8_t ff_eac3_default_cpl_band_struct[18] = {
145 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
148 /* AC-3 MDCT window */
151 DECLARE_ALIGNED(16, const int16_t, ff_ac3_window)[AC3_WINDOW_SIZE/2] = {
152 4, 7, 12, 16, 21, 28, 34, 42,
153 51, 61, 72, 84, 97, 111, 127, 145,
154 164, 184, 207, 231, 257, 285, 315, 347,
155 382, 419, 458, 500, 544, 591, 641, 694,
156 750, 810, 872, 937, 1007, 1079, 1155, 1235,
157 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
158 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
159 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
160 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
161 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
162 8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
163 10660,10960,11264,11570,11879,12190,12504,12820,
164 13138,13458,13780,14103,14427,14753,15079,15407,
165 15735,16063,16392,16720,17049,17377,17705,18032,
166 18358,18683,19007,19330,19651,19970,20287,20602,
167 20914,21225,21532,21837,22139,22438,22733,23025,
168 23314,23599,23880,24157,24430,24699,24964,25225,
169 25481,25732,25979,26221,26459,26691,26919,27142,
170 27359,27572,27780,27983,28180,28373,28560,28742,
171 28919,29091,29258,29420,29577,29729,29876,30018,
172 30155,30288,30415,30538,30657,30771,30880,30985,
173 31086,31182,31274,31363,31447,31528,31605,31678,
174 31747,31814,31877,31936,31993,32046,32097,32145,
175 32190,32232,32272,32310,32345,32378,32409,32438,
176 32465,32490,32513,32535,32556,32574,32592,32608,
177 32623,32636,32649,32661,32671,32681,32690,32698,
178 32705,32712,32718,32724,32729,32733,32737,32741,
179 32744,32747,32750,32752,32754,32756,32757,32759,
180 32760,32761,32762,32763,32764,32764,32765,32765,
181 32766,32766,32766,32766,32767,32767,32767,32767,
182 32767,32767,32767,32767,32767,32767,32767,32767,
183 32767,32767,32767,32767,32767,32767,32767,32767,
186 const uint8_t ff_ac3_log_add_tab[260]= {
187 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
188 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
189 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
190 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
191 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
192 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
193 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
194 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
195 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
196 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
197 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
198 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
199 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
200 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
201 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
202 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
203 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
204 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
205 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
206 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
207 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
208 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
209 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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,
215 const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= {
216 { 0x04d0,0x04f0,0x0580 },
217 { 0x04d0,0x04f0,0x0580 },
218 { 0x0440,0x0460,0x04b0 },
219 { 0x0400,0x0410,0x0450 },
220 { 0x03e0,0x03e0,0x0420 },
221 { 0x03c0,0x03d0,0x03f0 },
222 { 0x03b0,0x03c0,0x03e0 },
223 { 0x03b0,0x03b0,0x03d0 },
224 { 0x03a0,0x03b0,0x03c0 },
225 { 0x03a0,0x03a0,0x03b0 },
226 { 0x03a0,0x03a0,0x03b0 },
227 { 0x03a0,0x03a0,0x03b0 },
228 { 0x03a0,0x03a0,0x03a0 },
229 { 0x0390,0x03a0,0x03a0 },
230 { 0x0390,0x0390,0x03a0 },
231 { 0x0390,0x0390,0x03a0 },
232 { 0x0380,0x0390,0x03a0 },
233 { 0x0380,0x0380,0x03a0 },
234 { 0x0370,0x0380,0x03a0 },
235 { 0x0370,0x0380,0x03a0 },
236 { 0x0360,0x0370,0x0390 },
237 { 0x0360,0x0370,0x0390 },
238 { 0x0350,0x0360,0x0390 },
239 { 0x0350,0x0360,0x0390 },
240 { 0x0340,0x0350,0x0380 },
241 { 0x0340,0x0350,0x0380 },
242 { 0x0330,0x0340,0x0380 },
243 { 0x0320,0x0340,0x0370 },
244 { 0x0310,0x0320,0x0360 },
245 { 0x0300,0x0310,0x0350 },
246 { 0x02f0,0x0300,0x0340 },
247 { 0x02f0,0x02f0,0x0330 },
248 { 0x02f0,0x02f0,0x0320 },
249 { 0x02f0,0x02f0,0x0310 },
250 { 0x0300,0x02f0,0x0300 },
251 { 0x0310,0x0300,0x02f0 },
252 { 0x0340,0x0320,0x02f0 },
253 { 0x0390,0x0350,0x02f0 },
254 { 0x03e0,0x0390,0x0300 },
255 { 0x0420,0x03e0,0x0310 },
256 { 0x0460,0x0420,0x0330 },
257 { 0x0490,0x0450,0x0350 },
258 { 0x04a0,0x04a0,0x03c0 },
259 { 0x0460,0x0490,0x0410 },
260 { 0x0440,0x0460,0x0470 },
261 { 0x0440,0x0440,0x04a0 },
262 { 0x0520,0x0480,0x0460 },
263 { 0x0800,0x0630,0x0440 },
264 { 0x0840,0x0840,0x0450 },
265 { 0x0840,0x0840,0x04e0 },
268 const uint8_t ff_ac3_bap_tab[64]= {
269 0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
270 3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
271 7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
272 9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
273 12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
274 14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
278 const uint8_t ff_ac3_slow_decay_tab[4]={
279 0x0f, 0x11, 0x13, 0x15,
282 const uint8_t ff_ac3_fast_decay_tab[4]={
283 0x3f, 0x53, 0x67, 0x7b,
286 const uint16_t ff_ac3_slow_gain_tab[4]= {
287 0x540, 0x4d8, 0x478, 0x410,
290 const uint16_t ff_ac3_db_per_bit_tab[4]= {
291 0x000, 0x700, 0x900, 0xb00,
294 const int16_t ff_ac3_floor_tab[8]= {
295 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
298 const uint16_t ff_ac3_fast_gain_tab[8]= {
299 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
303 * Default channel map for a dependent substream defined by acmod
305 const uint16_t ff_eac3_default_chmap[8] = {
306 AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2
308 AC3_CHMAP_L | AC3_CHMAP_R,
309 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
310 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
311 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
312 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR,
313 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR