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 "libavcore/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
135 /* AC-3 MDCT window */
138 const int16_t ff_ac3_window[AC3_WINDOW_SIZE/2] = {
139 4, 7, 12, 16, 21, 28, 34, 42,
140 51, 61, 72, 84, 97, 111, 127, 145,
141 164, 184, 207, 231, 257, 285, 315, 347,
142 382, 419, 458, 500, 544, 591, 641, 694,
143 750, 810, 872, 937, 1007, 1079, 1155, 1235,
144 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
145 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
146 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
147 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
148 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
149 8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
150 10660,10960,11264,11570,11879,12190,12504,12820,
151 13138,13458,13780,14103,14427,14753,15079,15407,
152 15735,16063,16392,16720,17049,17377,17705,18032,
153 18358,18683,19007,19330,19651,19970,20287,20602,
154 20914,21225,21532,21837,22139,22438,22733,23025,
155 23314,23599,23880,24157,24430,24699,24964,25225,
156 25481,25732,25979,26221,26459,26691,26919,27142,
157 27359,27572,27780,27983,28180,28373,28560,28742,
158 28919,29091,29258,29420,29577,29729,29876,30018,
159 30155,30288,30415,30538,30657,30771,30880,30985,
160 31086,31182,31274,31363,31447,31528,31605,31678,
161 31747,31814,31877,31936,31993,32046,32097,32145,
162 32190,32232,32272,32310,32345,32378,32409,32438,
163 32465,32490,32513,32535,32556,32574,32592,32608,
164 32623,32636,32649,32661,32671,32681,32690,32698,
165 32705,32712,32718,32724,32729,32733,32737,32741,
166 32744,32747,32750,32752,32754,32756,32757,32759,
167 32760,32761,32762,32763,32764,32764,32765,32765,
168 32766,32766,32766,32766,32767,32767,32767,32767,
169 32767,32767,32767,32767,32767,32767,32767,32767,
170 32767,32767,32767,32767,32767,32767,32767,32767,
173 const uint8_t ff_ac3_log_add_tab[260]= {
174 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
175 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
176 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
177 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
178 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
179 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
180 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
181 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
182 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
183 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
184 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
185 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
186 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
187 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
188 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
189 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
190 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
191 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
192 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
193 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
194 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
195 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
196 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
197 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
198 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
199 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
202 const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= {
203 { 0x04d0,0x04f0,0x0580 },
204 { 0x04d0,0x04f0,0x0580 },
205 { 0x0440,0x0460,0x04b0 },
206 { 0x0400,0x0410,0x0450 },
207 { 0x03e0,0x03e0,0x0420 },
208 { 0x03c0,0x03d0,0x03f0 },
209 { 0x03b0,0x03c0,0x03e0 },
210 { 0x03b0,0x03b0,0x03d0 },
211 { 0x03a0,0x03b0,0x03c0 },
212 { 0x03a0,0x03a0,0x03b0 },
213 { 0x03a0,0x03a0,0x03b0 },
214 { 0x03a0,0x03a0,0x03b0 },
215 { 0x03a0,0x03a0,0x03a0 },
216 { 0x0390,0x03a0,0x03a0 },
217 { 0x0390,0x0390,0x03a0 },
218 { 0x0390,0x0390,0x03a0 },
219 { 0x0380,0x0390,0x03a0 },
220 { 0x0380,0x0380,0x03a0 },
221 { 0x0370,0x0380,0x03a0 },
222 { 0x0370,0x0380,0x03a0 },
223 { 0x0360,0x0370,0x0390 },
224 { 0x0360,0x0370,0x0390 },
225 { 0x0350,0x0360,0x0390 },
226 { 0x0350,0x0360,0x0390 },
227 { 0x0340,0x0350,0x0380 },
228 { 0x0340,0x0350,0x0380 },
229 { 0x0330,0x0340,0x0380 },
230 { 0x0320,0x0340,0x0370 },
231 { 0x0310,0x0320,0x0360 },
232 { 0x0300,0x0310,0x0350 },
233 { 0x02f0,0x0300,0x0340 },
234 { 0x02f0,0x02f0,0x0330 },
235 { 0x02f0,0x02f0,0x0320 },
236 { 0x02f0,0x02f0,0x0310 },
237 { 0x0300,0x02f0,0x0300 },
238 { 0x0310,0x0300,0x02f0 },
239 { 0x0340,0x0320,0x02f0 },
240 { 0x0390,0x0350,0x02f0 },
241 { 0x03e0,0x0390,0x0300 },
242 { 0x0420,0x03e0,0x0310 },
243 { 0x0460,0x0420,0x0330 },
244 { 0x0490,0x0450,0x0350 },
245 { 0x04a0,0x04a0,0x03c0 },
246 { 0x0460,0x0490,0x0410 },
247 { 0x0440,0x0460,0x0470 },
248 { 0x0440,0x0440,0x04a0 },
249 { 0x0520,0x0480,0x0460 },
250 { 0x0800,0x0630,0x0440 },
251 { 0x0840,0x0840,0x0450 },
252 { 0x0840,0x0840,0x04e0 },
255 const uint8_t ff_ac3_bap_tab[64]= {
256 0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
257 3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
258 7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
259 9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
260 12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
261 14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
265 const uint8_t ff_ac3_slow_decay_tab[4]={
266 0x0f, 0x11, 0x13, 0x15,
269 const uint8_t ff_ac3_fast_decay_tab[4]={
270 0x3f, 0x53, 0x67, 0x7b,
273 const uint16_t ff_ac3_slow_gain_tab[4]= {
274 0x540, 0x4d8, 0x478, 0x410,
277 const uint16_t ff_ac3_db_per_bit_tab[4]= {
278 0x000, 0x700, 0x900, 0xb00,
281 const int16_t ff_ac3_floor_tab[8]= {
282 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
285 const uint16_t ff_ac3_fast_gain_tab[8]= {
286 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
289 const uint8_t ff_ac3_critical_band_size_tab[AC3_CRITICAL_BANDS]={
290 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
291 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3,
292 3, 6, 6, 6, 6, 6, 6, 12, 12, 12, 12, 24, 24, 24, 24, 24
295 * Default channel map for a dependent substream defined by acmod
297 const uint16_t ff_eac3_default_chmap[8] = {
298 AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2
300 AC3_CHMAP_L | AC3_CHMAP_R,
301 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
302 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
303 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
304 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR,
305 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR