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/audioconvert.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 ff_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 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 };
141 /* AC-3 MDCT window */
144 const int16_t ff_ac3_window[AC3_WINDOW_SIZE/2] = {
145 4, 7, 12, 16, 21, 28, 34, 42,
146 51, 61, 72, 84, 97, 111, 127, 145,
147 164, 184, 207, 231, 257, 285, 315, 347,
148 382, 419, 458, 500, 544, 591, 641, 694,
149 750, 810, 872, 937, 1007, 1079, 1155, 1235,
150 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
151 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
152 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
153 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
154 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
155 8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
156 10660,10960,11264,11570,11879,12190,12504,12820,
157 13138,13458,13780,14103,14427,14753,15079,15407,
158 15735,16063,16392,16720,17049,17377,17705,18032,
159 18358,18683,19007,19330,19651,19970,20287,20602,
160 20914,21225,21532,21837,22139,22438,22733,23025,
161 23314,23599,23880,24157,24430,24699,24964,25225,
162 25481,25732,25979,26221,26459,26691,26919,27142,
163 27359,27572,27780,27983,28180,28373,28560,28742,
164 28919,29091,29258,29420,29577,29729,29876,30018,
165 30155,30288,30415,30538,30657,30771,30880,30985,
166 31086,31182,31274,31363,31447,31528,31605,31678,
167 31747,31814,31877,31936,31993,32046,32097,32145,
168 32190,32232,32272,32310,32345,32378,32409,32438,
169 32465,32490,32513,32535,32556,32574,32592,32608,
170 32623,32636,32649,32661,32671,32681,32690,32698,
171 32705,32712,32718,32724,32729,32733,32737,32741,
172 32744,32747,32750,32752,32754,32756,32757,32759,
173 32760,32761,32762,32763,32764,32764,32765,32765,
174 32766,32766,32766,32766,32767,32767,32767,32767,
175 32767,32767,32767,32767,32767,32767,32767,32767,
176 32767,32767,32767,32767,32767,32767,32767,32767,
179 const uint8_t ff_ac3_log_add_tab[260]= {
180 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
181 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
182 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
183 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
184 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
185 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
186 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
187 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
188 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
189 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
190 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
191 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
192 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
193 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
194 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
195 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
196 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
197 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
198 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
199 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
200 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
201 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
202 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
203 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
204 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
205 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
208 const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= {
209 { 0x04d0,0x04f0,0x0580 },
210 { 0x04d0,0x04f0,0x0580 },
211 { 0x0440,0x0460,0x04b0 },
212 { 0x0400,0x0410,0x0450 },
213 { 0x03e0,0x03e0,0x0420 },
214 { 0x03c0,0x03d0,0x03f0 },
215 { 0x03b0,0x03c0,0x03e0 },
216 { 0x03b0,0x03b0,0x03d0 },
217 { 0x03a0,0x03b0,0x03c0 },
218 { 0x03a0,0x03a0,0x03b0 },
219 { 0x03a0,0x03a0,0x03b0 },
220 { 0x03a0,0x03a0,0x03b0 },
221 { 0x03a0,0x03a0,0x03a0 },
222 { 0x0390,0x03a0,0x03a0 },
223 { 0x0390,0x0390,0x03a0 },
224 { 0x0390,0x0390,0x03a0 },
225 { 0x0380,0x0390,0x03a0 },
226 { 0x0380,0x0380,0x03a0 },
227 { 0x0370,0x0380,0x03a0 },
228 { 0x0370,0x0380,0x03a0 },
229 { 0x0360,0x0370,0x0390 },
230 { 0x0360,0x0370,0x0390 },
231 { 0x0350,0x0360,0x0390 },
232 { 0x0350,0x0360,0x0390 },
233 { 0x0340,0x0350,0x0380 },
234 { 0x0340,0x0350,0x0380 },
235 { 0x0330,0x0340,0x0380 },
236 { 0x0320,0x0340,0x0370 },
237 { 0x0310,0x0320,0x0360 },
238 { 0x0300,0x0310,0x0350 },
239 { 0x02f0,0x0300,0x0340 },
240 { 0x02f0,0x02f0,0x0330 },
241 { 0x02f0,0x02f0,0x0320 },
242 { 0x02f0,0x02f0,0x0310 },
243 { 0x0300,0x02f0,0x0300 },
244 { 0x0310,0x0300,0x02f0 },
245 { 0x0340,0x0320,0x02f0 },
246 { 0x0390,0x0350,0x02f0 },
247 { 0x03e0,0x0390,0x0300 },
248 { 0x0420,0x03e0,0x0310 },
249 { 0x0460,0x0420,0x0330 },
250 { 0x0490,0x0450,0x0350 },
251 { 0x04a0,0x04a0,0x03c0 },
252 { 0x0460,0x0490,0x0410 },
253 { 0x0440,0x0460,0x0470 },
254 { 0x0440,0x0440,0x04a0 },
255 { 0x0520,0x0480,0x0460 },
256 { 0x0800,0x0630,0x0440 },
257 { 0x0840,0x0840,0x0450 },
258 { 0x0840,0x0840,0x04e0 },
261 const uint8_t ff_ac3_bap_tab[64]= {
262 0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
263 3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
264 7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
265 9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
266 12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
267 14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
271 const uint8_t ff_ac3_slow_decay_tab[4]={
272 0x0f, 0x11, 0x13, 0x15,
275 const uint8_t ff_ac3_fast_decay_tab[4]={
276 0x3f, 0x53, 0x67, 0x7b,
279 const uint16_t ff_ac3_slow_gain_tab[4]= {
280 0x540, 0x4d8, 0x478, 0x410,
283 const uint16_t ff_ac3_db_per_bit_tab[4]= {
284 0x000, 0x700, 0x900, 0xb00,
287 const int16_t ff_ac3_floor_tab[8]= {
288 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
291 const uint16_t ff_ac3_fast_gain_tab[8]= {
292 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
296 * Default channel map for a dependent substream defined by acmod
298 const uint16_t ff_eac3_default_chmap[8] = {
299 AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2
301 AC3_CHMAP_L | AC3_CHMAP_R,
302 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
303 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
304 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
305 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR,
306 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR