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"
28 #include "libavutil/mem_internal.h"
34 * Possible frame sizes.
35 * from ATSC A/52 Table 5.18 Frame Size Code Table.
37 const uint16_t ff_ac3_frame_size_tab[38][3] = {
79 * Map audio coding mode (acmod) to number of full-bandwidth channels.
80 * from ATSC A/52 Table 5.8 Audio Coding Mode
82 const uint8_t ff_ac3_channels_tab[8] = {
83 2, 1, 2, 3, 3, 4, 4, 5
87 * Map audio coding mode (acmod) to channel layout mask.
89 const uint16_t avpriv_ac3_channel_layout_tab[8] = {
93 AV_CH_LAYOUT_SURROUND,
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, } },
109 * Table to remap channels from SMPTE order to AC-3 order.
110 * [channel_mode][lfe][ch]
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 } },
119 * Table to remap channels from AC-3 order to SMPTE order.
120 * [channel_mode][lfe][ch]
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 } },
128 /* possible frequencies */
129 const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 };
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
138 * Table of bin locations for rematrixing bands
139 * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
141 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
144 * Table E2.16 Default Coupling Banding Structure
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
150 const uint8_t ff_ac3_log_add_tab[260]= {
151 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
152 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
153 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
154 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
155 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
156 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
157 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
158 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
159 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
160 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
161 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
162 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
163 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
164 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
165 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
166 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
167 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
168 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
169 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
170 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
171 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
172 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
173 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
174 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
175 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
176 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
179 const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= {
180 { 0x04d0,0x04f0,0x0580 },
181 { 0x04d0,0x04f0,0x0580 },
182 { 0x0440,0x0460,0x04b0 },
183 { 0x0400,0x0410,0x0450 },
184 { 0x03e0,0x03e0,0x0420 },
185 { 0x03c0,0x03d0,0x03f0 },
186 { 0x03b0,0x03c0,0x03e0 },
187 { 0x03b0,0x03b0,0x03d0 },
188 { 0x03a0,0x03b0,0x03c0 },
189 { 0x03a0,0x03a0,0x03b0 },
190 { 0x03a0,0x03a0,0x03b0 },
191 { 0x03a0,0x03a0,0x03b0 },
192 { 0x03a0,0x03a0,0x03a0 },
193 { 0x0390,0x03a0,0x03a0 },
194 { 0x0390,0x0390,0x03a0 },
195 { 0x0390,0x0390,0x03a0 },
196 { 0x0380,0x0390,0x03a0 },
197 { 0x0380,0x0380,0x03a0 },
198 { 0x0370,0x0380,0x03a0 },
199 { 0x0370,0x0380,0x03a0 },
200 { 0x0360,0x0370,0x0390 },
201 { 0x0360,0x0370,0x0390 },
202 { 0x0350,0x0360,0x0390 },
203 { 0x0350,0x0360,0x0390 },
204 { 0x0340,0x0350,0x0380 },
205 { 0x0340,0x0350,0x0380 },
206 { 0x0330,0x0340,0x0380 },
207 { 0x0320,0x0340,0x0370 },
208 { 0x0310,0x0320,0x0360 },
209 { 0x0300,0x0310,0x0350 },
210 { 0x02f0,0x0300,0x0340 },
211 { 0x02f0,0x02f0,0x0330 },
212 { 0x02f0,0x02f0,0x0320 },
213 { 0x02f0,0x02f0,0x0310 },
214 { 0x0300,0x02f0,0x0300 },
215 { 0x0310,0x0300,0x02f0 },
216 { 0x0340,0x0320,0x02f0 },
217 { 0x0390,0x0350,0x02f0 },
218 { 0x03e0,0x0390,0x0300 },
219 { 0x0420,0x03e0,0x0310 },
220 { 0x0460,0x0420,0x0330 },
221 { 0x0490,0x0450,0x0350 },
222 { 0x04a0,0x04a0,0x03c0 },
223 { 0x0460,0x0490,0x0410 },
224 { 0x0440,0x0460,0x0470 },
225 { 0x0440,0x0440,0x04a0 },
226 { 0x0520,0x0480,0x0460 },
227 { 0x0800,0x0630,0x0440 },
228 { 0x0840,0x0840,0x0450 },
229 { 0x0840,0x0840,0x04e0 },
232 const uint8_t ff_ac3_bap_tab[64]= {
233 0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
234 3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
235 7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
236 9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
237 12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
238 14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
242 const uint8_t ff_ac3_slow_decay_tab[4]={
243 0x0f, 0x11, 0x13, 0x15,
246 const uint8_t ff_ac3_fast_decay_tab[4]={
247 0x3f, 0x53, 0x67, 0x7b,
250 const uint16_t ff_ac3_slow_gain_tab[4]= {
251 0x540, 0x4d8, 0x478, 0x410,
254 const uint16_t ff_ac3_db_per_bit_tab[4]= {
255 0x000, 0x700, 0x900, 0xb00,
258 const int16_t ff_ac3_floor_tab[8]= {
259 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
262 const uint16_t ff_ac3_fast_gain_tab[8]= {
263 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
267 * Default channel map for a dependent substream defined by acmod
269 const uint16_t ff_eac3_default_chmap[8] = {
270 AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2
272 AC3_CHMAP_L | AC3_CHMAP_R,
273 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
274 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
275 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR,
276 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR,
277 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR
279 const uint64_t ff_eac3_custom_channel_map_locations[16][2] = {
280 { 1, AV_CH_FRONT_LEFT },
281 { 1, AV_CH_FRONT_CENTER },
282 { 1, AV_CH_FRONT_RIGHT },
283 { 1, AV_CH_SIDE_LEFT },
284 { 1, AV_CH_SIDE_RIGHT },
285 { 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER },
286 { 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT },
287 { 0, AV_CH_BACK_CENTER },
288 { 0, AV_CH_TOP_CENTER },
289 { 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT },
290 { 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT },
291 { 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT},
292 { 0, AV_CH_TOP_FRONT_CENTER },
293 { 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT },
294 { 0, AV_CH_LOW_FREQUENCY_2 },
295 { 1, AV_CH_LOW_FREQUENCY },