1/* 2 * The simplest AC-3 encoder 3 * Copyright (c) 2000 Fabrice Bellard 4 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> 5 * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> 6 * 7 * This file is part of FFmpeg. 8 * 9 * FFmpeg is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Lesser General Public 11 * License as published by the Free Software Foundation; either 12 * version 2.1 of the License, or (at your option) any later version. 13 * 14 * FFmpeg is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with FFmpeg; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 22 */ 23 24/** 25 * @file 26 * The simplest AC-3 encoder. 27 */ 28 29#include <stdint.h> 30 31#include "libavutil/attributes.h" 32#include "libavutil/avassert.h" 33#include "libavutil/avstring.h" 34#include "libavutil/channel_layout.h" 35#include "libavutil/crc.h" 36#include "libavutil/internal.h" 37#include "libavutil/opt.h" 38#include "avcodec.h" 39#include "put_bits.h" 40#include "audiodsp.h" 41#include "ac3dsp.h" 42#include "ac3.h" 43#include "fft.h" 44#include "ac3enc.h" 45#include "eac3enc.h" 46 47typedef struct AC3Mant { 48 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4 49 int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4 50} AC3Mant; 51 52#define CMIXLEV_NUM_OPTIONS 3 53static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = { 54 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB 55}; 56 57#define SURMIXLEV_NUM_OPTIONS 3 58static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = { 59 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO 60}; 61 62#define EXTMIXLEV_NUM_OPTIONS 8 63static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = { 64 LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB, 65 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO 66}; 67 68 69/** 70 * LUT for number of exponent groups. 71 * exponent_group_tab[coupling][exponent strategy-1][number of coefficients] 72 */ 73static uint8_t exponent_group_tab[2][3][256]; 74 75 76/** 77 * List of supported channel layouts. 78 */ 79const uint64_t ff_ac3_channel_layouts[19] = { 80 AV_CH_LAYOUT_MONO, 81 AV_CH_LAYOUT_STEREO, 82 AV_CH_LAYOUT_2_1, 83 AV_CH_LAYOUT_SURROUND, 84 AV_CH_LAYOUT_2_2, 85 AV_CH_LAYOUT_QUAD, 86 AV_CH_LAYOUT_4POINT0, 87 AV_CH_LAYOUT_5POINT0, 88 AV_CH_LAYOUT_5POINT0_BACK, 89 (AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY), 90 (AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY), 91 (AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY), 92 (AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY), 93 (AV_CH_LAYOUT_2_2 | AV_CH_LOW_FREQUENCY), 94 (AV_CH_LAYOUT_QUAD | AV_CH_LOW_FREQUENCY), 95 (AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY), 96 AV_CH_LAYOUT_5POINT1, 97 AV_CH_LAYOUT_5POINT1_BACK, 98 0 99}; 100 101 102/** 103 * LUT to select the bandwidth code based on the bit rate, sample rate, and 104 * number of full-bandwidth channels. 105 * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code] 106 */ 107static const uint8_t ac3_bandwidth_tab[5][3][19] = { 108// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 109 110 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, 111 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, 112 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, 113 114 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, 115 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, 116 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, 117 118 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 }, 119 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 }, 120 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } }, 121 122 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 }, 123 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 }, 124 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } }, 125 126 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 }, 127 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 }, 128 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } } 129}; 130 131 132/** 133 * LUT to select the coupling start band based on the bit rate, sample rate, and 134 * number of full-bandwidth channels. -1 = coupling off 135 * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code] 136 * 137 * TODO: more testing for optimal parameters. 138 * multi-channel tests at 44.1kHz and 32kHz. 139 */ 140static const int8_t ac3_coupling_start_tab[6][3][19] = { 141// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 142 143 // 2/0 144 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 }, 145 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 }, 146 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 147 148 // 3/0 149 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 150 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 151 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 152 153 // 2/1 - untested 154 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 155 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 156 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 157 158 // 3/1 159 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 160 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 161 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 162 163 // 2/2 - untested 164 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 165 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 166 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 167 168 // 3/2 169 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, 170 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, 171 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 172}; 173 174 175/** 176 * Adjust the frame size to make the average bit rate match the target bit rate. 177 * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3. 178 * 179 * @param s AC-3 encoder private context 180 */ 181void ff_ac3_adjust_frame_size(AC3EncodeContext *s) 182{ 183 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) { 184 s->bits_written -= s->bit_rate; 185 s->samples_written -= s->sample_rate; 186 } 187 s->frame_size = s->frame_size_min + 188 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate); 189 s->bits_written += s->frame_size * 8; 190 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks; 191} 192 193 194/** 195 * Set the initial coupling strategy parameters prior to coupling analysis. 196 * 197 * @param s AC-3 encoder private context 198 */ 199void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s) 200{ 201 int blk, ch; 202 int got_cpl_snr; 203 int num_cpl_blocks; 204 205 /* set coupling use flags for each block/channel */ 206 /* TODO: turn coupling on/off and adjust start band based on bit usage */ 207 for (blk = 0; blk < s->num_blocks; blk++) { 208 AC3Block *block = &s->blocks[blk]; 209 for (ch = 1; ch <= s->fbw_channels; ch++) 210 block->channel_in_cpl[ch] = s->cpl_on; 211 } 212 213 /* enable coupling for each block if at least 2 channels have coupling 214 enabled for that block */ 215 got_cpl_snr = 0; 216 num_cpl_blocks = 0; 217 for (blk = 0; blk < s->num_blocks; blk++) { 218 AC3Block *block = &s->blocks[blk]; 219 block->num_cpl_channels = 0; 220 for (ch = 1; ch <= s->fbw_channels; ch++) 221 block->num_cpl_channels += block->channel_in_cpl[ch]; 222 block->cpl_in_use = block->num_cpl_channels > 1; 223 num_cpl_blocks += block->cpl_in_use; 224 if (!block->cpl_in_use) { 225 block->num_cpl_channels = 0; 226 for (ch = 1; ch <= s->fbw_channels; ch++) 227 block->channel_in_cpl[ch] = 0; 228 } 229 230 block->new_cpl_strategy = !blk; 231 if (blk) { 232 for (ch = 1; ch <= s->fbw_channels; ch++) { 233 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { 234 block->new_cpl_strategy = 1; 235 break; 236 } 237 } 238 } 239 block->new_cpl_leak = block->new_cpl_strategy; 240 241 if (!blk || (block->cpl_in_use && !got_cpl_snr)) { 242 block->new_snr_offsets = 1; 243 if (block->cpl_in_use) 244 got_cpl_snr = 1; 245 } else { 246 block->new_snr_offsets = 0; 247 } 248 } 249 if (!num_cpl_blocks) 250 s->cpl_on = 0; 251 252 /* set bandwidth for each channel */ 253 for (blk = 0; blk < s->num_blocks; blk++) { 254 AC3Block *block = &s->blocks[blk]; 255 for (ch = 1; ch <= s->fbw_channels; ch++) { 256 if (block->channel_in_cpl[ch]) 257 block->end_freq[ch] = s->start_freq[CPL_CH]; 258 else 259 block->end_freq[ch] = s->bandwidth_code * 3 + 73; 260 } 261 } 262} 263 264 265/** 266 * Apply stereo rematrixing to coefficients based on rematrixing flags. 267 * 268 * @param s AC-3 encoder private context 269 */ 270void ff_ac3_apply_rematrixing(AC3EncodeContext *s) 271{ 272 int nb_coefs; 273 int blk, bnd, i; 274 int start, end; 275 uint8_t *flags = NULL; 276 277 if (!s->rematrixing_enabled) 278 return; 279 280 for (blk = 0; blk < s->num_blocks; blk++) { 281 AC3Block *block = &s->blocks[blk]; 282 if (block->new_rematrixing_strategy) 283 flags = block->rematrixing_flags; 284 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); 285 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { 286 if (flags[bnd]) { 287 start = ff_ac3_rematrix_band_tab[bnd]; 288 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); 289 for (i = start; i < end; i++) { 290 int32_t lt = block->fixed_coef[1][i]; 291 int32_t rt = block->fixed_coef[2][i]; 292 block->fixed_coef[1][i] = (lt + rt) >> 1; 293 block->fixed_coef[2][i] = (lt - rt) >> 1; 294 } 295 } 296 } 297 } 298} 299 300 301/* 302 * Initialize exponent tables. 303 */ 304static av_cold void exponent_init(AC3EncodeContext *s) 305{ 306 int expstr, i, grpsize; 307 308 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) { 309 grpsize = 3 << expstr; 310 for (i = 12; i < 256; i++) { 311 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize; 312 exponent_group_tab[1][expstr][i] = (i ) / grpsize; 313 } 314 } 315 /* LFE */ 316 exponent_group_tab[0][0][7] = 2; 317 318 if (CONFIG_EAC3_ENCODER && s->eac3) 319 ff_eac3_exponent_init(); 320} 321 322 323/* 324 * Extract exponents from the MDCT coefficients. 325 */ 326static void extract_exponents(AC3EncodeContext *s) 327{ 328 int ch = !s->cpl_on; 329 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1); 330 AC3Block *block = &s->blocks[0]; 331 332 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size); 333} 334 335 336/** 337 * Exponent Difference Threshold. 338 * New exponents are sent if their SAD exceed this number. 339 */ 340#define EXP_DIFF_THRESHOLD 500 341 342/** 343 * Table used to select exponent strategy based on exponent reuse block interval. 344 */ 345static const uint8_t exp_strategy_reuse_tab[4][6] = { 346 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, 347 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, 348 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, 349 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 } 350}; 351 352/* 353 * Calculate exponent strategies for all channels. 354 * Array arrangement is reversed to simplify the per-channel calculation. 355 */ 356static void compute_exp_strategy(AC3EncodeContext *s) 357{ 358 int ch, blk, blk1; 359 360 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { 361 uint8_t *exp_strategy = s->exp_strategy[ch]; 362 uint8_t *exp = s->blocks[0].exp[ch]; 363 int exp_diff; 364 365 /* estimate if the exponent variation & decide if they should be 366 reused in the next frame */ 367 exp_strategy[0] = EXP_NEW; 368 exp += AC3_MAX_COEFS; 369 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) { 370 if (ch == CPL_CH) { 371 if (!s->blocks[blk-1].cpl_in_use) { 372 exp_strategy[blk] = EXP_NEW; 373 continue; 374 } else if (!s->blocks[blk].cpl_in_use) { 375 exp_strategy[blk] = EXP_REUSE; 376 continue; 377 } 378 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { 379 exp_strategy[blk] = EXP_NEW; 380 continue; 381 } 382 exp_diff = s->dsp.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16); 383 exp_strategy[blk] = EXP_REUSE; 384 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS)) 385 exp_strategy[blk] = EXP_NEW; 386 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD) 387 exp_strategy[blk] = EXP_NEW; 388 } 389 390 /* now select the encoding strategy type : if exponents are often 391 recoded, we use a coarse encoding */ 392 blk = 0; 393 while (blk < s->num_blocks) { 394 blk1 = blk + 1; 395 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) 396 blk1++; 397 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1]; 398 blk = blk1; 399 } 400 } 401 if (s->lfe_on) { 402 ch = s->lfe_channel; 403 s->exp_strategy[ch][0] = EXP_D15; 404 for (blk = 1; blk < s->num_blocks; blk++) 405 s->exp_strategy[ch][blk] = EXP_REUSE; 406 } 407 408 /* for E-AC-3, determine frame exponent strategy */ 409 if (CONFIG_EAC3_ENCODER && s->eac3) 410 ff_eac3_get_frame_exp_strategy(s); 411} 412 413 414/** 415 * Update the exponents so that they are the ones the decoder will decode. 416 * 417 * @param[in,out] exp array of exponents for 1 block in 1 channel 418 * @param nb_exps number of exponents in active bandwidth 419 * @param exp_strategy exponent strategy for the block 420 * @param cpl indicates if the block is in the coupling channel 421 */ 422static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy, 423 int cpl) 424{ 425 int nb_groups, i, k; 426 427 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3; 428 429 /* for each group, compute the minimum exponent */ 430 switch(exp_strategy) { 431 case EXP_D25: 432 for (i = 1, k = 1-cpl; i <= nb_groups; i++) { 433 uint8_t exp_min = exp[k]; 434 if (exp[k+1] < exp_min) 435 exp_min = exp[k+1]; 436 exp[i-cpl] = exp_min; 437 k += 2; 438 } 439 break; 440 case EXP_D45: 441 for (i = 1, k = 1-cpl; i <= nb_groups; i++) { 442 uint8_t exp_min = exp[k]; 443 if (exp[k+1] < exp_min) 444 exp_min = exp[k+1]; 445 if (exp[k+2] < exp_min) 446 exp_min = exp[k+2]; 447 if (exp[k+3] < exp_min) 448 exp_min = exp[k+3]; 449 exp[i-cpl] = exp_min; 450 k += 4; 451 } 452 break; 453 } 454 455 /* constraint for DC exponent */ 456 if (!cpl && exp[0] > 15) 457 exp[0] = 15; 458 459 /* decrease the delta between each groups to within 2 so that they can be 460 differentially encoded */ 461 for (i = 1; i <= nb_groups; i++) 462 exp[i] = FFMIN(exp[i], exp[i-1] + 2); 463 i--; 464 while (--i >= 0) 465 exp[i] = FFMIN(exp[i], exp[i+1] + 2); 466 467 if (cpl) 468 exp[-1] = exp[0] & ~1; 469 470 /* now we have the exponent values the decoder will see */ 471 switch (exp_strategy) { 472 case EXP_D25: 473 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) { 474 uint8_t exp1 = exp[i-cpl]; 475 exp[k--] = exp1; 476 exp[k--] = exp1; 477 } 478 break; 479 case EXP_D45: 480 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) { 481 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl]; 482 k -= 4; 483 } 484 break; 485 } 486} 487 488 489/* 490 * Encode exponents from original extracted form to what the decoder will see. 491 * This copies and groups exponents based on exponent strategy and reduces 492 * deltas between adjacent exponent groups so that they can be differentially 493 * encoded. 494 */ 495static void encode_exponents(AC3EncodeContext *s) 496{ 497 int blk, blk1, ch, cpl; 498 uint8_t *exp, *exp_strategy; 499 int nb_coefs, num_reuse_blocks; 500 501 for (ch = !s->cpl_on; ch <= s->channels; ch++) { 502 exp = s->blocks[0].exp[ch] + s->start_freq[ch]; 503 exp_strategy = s->exp_strategy[ch]; 504 505 cpl = (ch == CPL_CH); 506 blk = 0; 507 while (blk < s->num_blocks) { 508 AC3Block *block = &s->blocks[blk]; 509 if (cpl && !block->cpl_in_use) { 510 exp += AC3_MAX_COEFS; 511 blk++; 512 continue; 513 } 514 nb_coefs = block->end_freq[ch] - s->start_freq[ch]; 515 blk1 = blk + 1; 516 517 /* count the number of EXP_REUSE blocks after the current block 518 and set exponent reference block numbers */ 519 s->exp_ref_block[ch][blk] = blk; 520 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) { 521 s->exp_ref_block[ch][blk1] = blk; 522 blk1++; 523 } 524 num_reuse_blocks = blk1 - blk - 1; 525 526 /* for the EXP_REUSE case we select the min of the exponents */ 527 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks, 528 AC3_MAX_COEFS); 529 530 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl); 531 532 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1); 533 blk = blk1; 534 } 535 } 536 537 /* reference block numbers have been changed, so reset ref_bap_set */ 538 s->ref_bap_set = 0; 539} 540 541 542/* 543 * Count exponent bits based on bandwidth, coupling, and exponent strategies. 544 */ 545static int count_exponent_bits(AC3EncodeContext *s) 546{ 547 int blk, ch; 548 int nb_groups, bit_count; 549 550 bit_count = 0; 551 for (blk = 0; blk < s->num_blocks; blk++) { 552 AC3Block *block = &s->blocks[blk]; 553 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 554 int exp_strategy = s->exp_strategy[ch][blk]; 555 int cpl = (ch == CPL_CH); 556 int nb_coefs = block->end_freq[ch] - s->start_freq[ch]; 557 558 if (exp_strategy == EXP_REUSE) 559 continue; 560 561 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs]; 562 bit_count += 4 + (nb_groups * 7); 563 } 564 } 565 566 return bit_count; 567} 568 569 570/** 571 * Group exponents. 572 * 3 delta-encoded exponents are in each 7-bit group. The number of groups 573 * varies depending on exponent strategy and bandwidth. 574 * 575 * @param s AC-3 encoder private context 576 */ 577void ff_ac3_group_exponents(AC3EncodeContext *s) 578{ 579 int blk, ch, i, cpl; 580 int group_size, nb_groups; 581 uint8_t *p; 582 int delta0, delta1, delta2; 583 int exp0, exp1; 584 585 for (blk = 0; blk < s->num_blocks; blk++) { 586 AC3Block *block = &s->blocks[blk]; 587 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 588 int exp_strategy = s->exp_strategy[ch][blk]; 589 if (exp_strategy == EXP_REUSE) 590 continue; 591 cpl = (ch == CPL_CH); 592 group_size = exp_strategy + (exp_strategy == EXP_D45); 593 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]]; 594 p = block->exp[ch] + s->start_freq[ch] - cpl; 595 596 /* DC exponent */ 597 exp1 = *p++; 598 block->grouped_exp[ch][0] = exp1; 599 600 /* remaining exponents are delta encoded */ 601 for (i = 1; i <= nb_groups; i++) { 602 /* merge three delta in one code */ 603 exp0 = exp1; 604 exp1 = p[0]; 605 p += group_size; 606 delta0 = exp1 - exp0 + 2; 607 av_assert2(delta0 >= 0 && delta0 <= 4); 608 609 exp0 = exp1; 610 exp1 = p[0]; 611 p += group_size; 612 delta1 = exp1 - exp0 + 2; 613 av_assert2(delta1 >= 0 && delta1 <= 4); 614 615 exp0 = exp1; 616 exp1 = p[0]; 617 p += group_size; 618 delta2 = exp1 - exp0 + 2; 619 av_assert2(delta2 >= 0 && delta2 <= 4); 620 621 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2; 622 } 623 } 624 } 625} 626 627 628/** 629 * Calculate final exponents from the supplied MDCT coefficients and exponent shift. 630 * Extract exponents from MDCT coefficients, calculate exponent strategies, 631 * and encode final exponents. 632 * 633 * @param s AC-3 encoder private context 634 */ 635void ff_ac3_process_exponents(AC3EncodeContext *s) 636{ 637 extract_exponents(s); 638 639 compute_exp_strategy(s); 640 641 encode_exponents(s); 642 643 emms_c(); 644} 645 646 647/* 648 * Count frame bits that are based solely on fixed parameters. 649 * This only has to be run once when the encoder is initialized. 650 */ 651static void count_frame_bits_fixed(AC3EncodeContext *s) 652{ 653 static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 }; 654 int blk; 655 int frame_bits; 656 657 /* assumptions: 658 * no dynamic range codes 659 * bit allocation parameters do not change between blocks 660 * no delta bit allocation 661 * no skipped data 662 * no auxiliary data 663 * no E-AC-3 metadata 664 */ 665 666 /* header */ 667 frame_bits = 16; /* sync info */ 668 if (s->eac3) { 669 /* bitstream info header */ 670 frame_bits += 35; 671 frame_bits += 1 + 1; 672 if (s->num_blocks != 0x6) 673 frame_bits++; 674 frame_bits++; 675 /* audio frame header */ 676 if (s->num_blocks == 6) 677 frame_bits += 2; 678 frame_bits += 10; 679 /* exponent strategy */ 680 if (s->use_frame_exp_strategy) 681 frame_bits += 5 * s->fbw_channels; 682 else 683 frame_bits += s->num_blocks * 2 * s->fbw_channels; 684 if (s->lfe_on) 685 frame_bits += s->num_blocks; 686 /* converter exponent strategy */ 687 if (s->num_blks_code != 0x3) 688 frame_bits++; 689 else 690 frame_bits += s->fbw_channels * 5; 691 /* snr offsets */ 692 frame_bits += 10; 693 /* block start info */ 694 if (s->num_blocks != 1) 695 frame_bits++; 696 } else { 697 frame_bits += 49; 698 frame_bits += frame_bits_inc[s->channel_mode]; 699 } 700 701 /* audio blocks */ 702 for (blk = 0; blk < s->num_blocks; blk++) { 703 if (!s->eac3) { 704 /* block switch flags */ 705 frame_bits += s->fbw_channels; 706 707 /* dither flags */ 708 frame_bits += s->fbw_channels; 709 } 710 711 /* dynamic range */ 712 frame_bits++; 713 714 /* spectral extension */ 715 if (s->eac3) 716 frame_bits++; 717 718 if (!s->eac3) { 719 /* exponent strategy */ 720 frame_bits += 2 * s->fbw_channels; 721 if (s->lfe_on) 722 frame_bits++; 723 724 /* bit allocation params */ 725 frame_bits++; 726 if (!blk) 727 frame_bits += 2 + 2 + 2 + 2 + 3; 728 } 729 730 /* converter snr offset */ 731 if (s->eac3) 732 frame_bits++; 733 734 if (!s->eac3) { 735 /* delta bit allocation */ 736 frame_bits++; 737 738 /* skipped data */ 739 frame_bits++; 740 } 741 } 742 743 /* auxiliary data */ 744 frame_bits++; 745 746 /* CRC */ 747 frame_bits += 1 + 16; 748 749 s->frame_bits_fixed = frame_bits; 750} 751 752 753/* 754 * Initialize bit allocation. 755 * Set default parameter codes and calculate parameter values. 756 */ 757static av_cold void bit_alloc_init(AC3EncodeContext *s) 758{ 759 int ch; 760 761 /* init default parameters */ 762 s->slow_decay_code = 2; 763 s->fast_decay_code = 1; 764 s->slow_gain_code = 1; 765 s->db_per_bit_code = s->eac3 ? 2 : 3; 766 s->floor_code = 7; 767 for (ch = 0; ch <= s->channels; ch++) 768 s->fast_gain_code[ch] = 4; 769 770 /* initial snr offset */ 771 s->coarse_snr_offset = 40; 772 773 /* compute real values */ 774 /* currently none of these values change during encoding, so we can just 775 set them once at initialization */ 776 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift; 777 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift; 778 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code]; 779 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code]; 780 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code]; 781 s->bit_alloc.cpl_fast_leak = 0; 782 s->bit_alloc.cpl_slow_leak = 0; 783 784 count_frame_bits_fixed(s); 785} 786 787 788/* 789 * Count the bits used to encode the frame, minus exponents and mantissas. 790 * Bits based on fixed parameters have already been counted, so now we just 791 * have to add the bits based on parameters that change during encoding. 792 */ 793static void count_frame_bits(AC3EncodeContext *s) 794{ 795 AC3EncOptions *opt = &s->options; 796 int blk, ch; 797 int frame_bits = 0; 798 799 /* header */ 800 if (s->eac3) { 801 if (opt->eac3_mixing_metadata) { 802 if (s->channel_mode > AC3_CHMODE_STEREO) 803 frame_bits += 2; 804 if (s->has_center) 805 frame_bits += 6; 806 if (s->has_surround) 807 frame_bits += 6; 808 frame_bits += s->lfe_on; 809 frame_bits += 1 + 1 + 2; 810 if (s->channel_mode < AC3_CHMODE_STEREO) 811 frame_bits++; 812 frame_bits++; 813 } 814 if (opt->eac3_info_metadata) { 815 frame_bits += 3 + 1 + 1; 816 if (s->channel_mode == AC3_CHMODE_STEREO) 817 frame_bits += 2 + 2; 818 if (s->channel_mode >= AC3_CHMODE_2F2R) 819 frame_bits += 2; 820 frame_bits++; 821 if (opt->audio_production_info) 822 frame_bits += 5 + 2 + 1; 823 frame_bits++; 824 } 825 /* coupling */ 826 if (s->channel_mode > AC3_CHMODE_MONO) { 827 frame_bits++; 828 for (blk = 1; blk < s->num_blocks; blk++) { 829 AC3Block *block = &s->blocks[blk]; 830 frame_bits++; 831 if (block->new_cpl_strategy) 832 frame_bits++; 833 } 834 } 835 /* coupling exponent strategy */ 836 if (s->cpl_on) { 837 if (s->use_frame_exp_strategy) { 838 frame_bits += 5 * s->cpl_on; 839 } else { 840 for (blk = 0; blk < s->num_blocks; blk++) 841 frame_bits += 2 * s->blocks[blk].cpl_in_use; 842 } 843 } 844 } else { 845 if (opt->audio_production_info) 846 frame_bits += 7; 847 if (s->bitstream_id == 6) { 848 if (opt->extended_bsi_1) 849 frame_bits += 14; 850 if (opt->extended_bsi_2) 851 frame_bits += 14; 852 } 853 } 854 855 /* audio blocks */ 856 for (blk = 0; blk < s->num_blocks; blk++) { 857 AC3Block *block = &s->blocks[blk]; 858 859 /* coupling strategy */ 860 if (!s->eac3) 861 frame_bits++; 862 if (block->new_cpl_strategy) { 863 if (!s->eac3) 864 frame_bits++; 865 if (block->cpl_in_use) { 866 if (s->eac3) 867 frame_bits++; 868 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) 869 frame_bits += s->fbw_channels; 870 if (s->channel_mode == AC3_CHMODE_STEREO) 871 frame_bits++; 872 frame_bits += 4 + 4; 873 if (s->eac3) 874 frame_bits++; 875 else 876 frame_bits += s->num_cpl_subbands - 1; 877 } 878 } 879 880 /* coupling coordinates */ 881 if (block->cpl_in_use) { 882 for (ch = 1; ch <= s->fbw_channels; ch++) { 883 if (block->channel_in_cpl[ch]) { 884 if (!s->eac3 || block->new_cpl_coords[ch] != 2) 885 frame_bits++; 886 if (block->new_cpl_coords[ch]) { 887 frame_bits += 2; 888 frame_bits += (4 + 4) * s->num_cpl_bands; 889 } 890 } 891 } 892 } 893 894 /* stereo rematrixing */ 895 if (s->channel_mode == AC3_CHMODE_STEREO) { 896 if (!s->eac3 || blk > 0) 897 frame_bits++; 898 if (s->blocks[blk].new_rematrixing_strategy) 899 frame_bits += block->num_rematrixing_bands; 900 } 901 902 /* bandwidth codes & gain range */ 903 for (ch = 1; ch <= s->fbw_channels; ch++) { 904 if (s->exp_strategy[ch][blk] != EXP_REUSE) { 905 if (!block->channel_in_cpl[ch]) 906 frame_bits += 6; 907 frame_bits += 2; 908 } 909 } 910 911 /* coupling exponent strategy */ 912 if (!s->eac3 && block->cpl_in_use) 913 frame_bits += 2; 914 915 /* snr offsets and fast gain codes */ 916 if (!s->eac3) { 917 frame_bits++; 918 if (block->new_snr_offsets) 919 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3); 920 } 921 922 /* coupling leak info */ 923 if (block->cpl_in_use) { 924 if (!s->eac3 || block->new_cpl_leak != 2) 925 frame_bits++; 926 if (block->new_cpl_leak) 927 frame_bits += 3 + 3; 928 } 929 } 930 931 s->frame_bits = s->frame_bits_fixed + frame_bits; 932} 933 934 935/* 936 * Calculate masking curve based on the final exponents. 937 * Also calculate the power spectral densities to use in future calculations. 938 */ 939static void bit_alloc_masking(AC3EncodeContext *s) 940{ 941 int blk, ch; 942 943 for (blk = 0; blk < s->num_blocks; blk++) { 944 AC3Block *block = &s->blocks[blk]; 945 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 946 /* We only need psd and mask for calculating bap. 947 Since we currently do not calculate bap when exponent 948 strategy is EXP_REUSE we do not need to calculate psd or mask. */ 949 if (s->exp_strategy[ch][blk] != EXP_REUSE) { 950 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch], 951 block->end_freq[ch], block->psd[ch], 952 block->band_psd[ch]); 953 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch], 954 s->start_freq[ch], block->end_freq[ch], 955 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]], 956 ch == s->lfe_channel, 957 DBA_NONE, 0, NULL, NULL, NULL, 958 block->mask[ch]); 959 } 960 } 961 } 962} 963 964 965/* 966 * Ensure that bap for each block and channel point to the current bap_buffer. 967 * They may have been switched during the bit allocation search. 968 */ 969static void reset_block_bap(AC3EncodeContext *s) 970{ 971 int blk, ch; 972 uint8_t *ref_bap; 973 974 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set) 975 return; 976 977 ref_bap = s->bap_buffer; 978 for (ch = 0; ch <= s->channels; ch++) { 979 for (blk = 0; blk < s->num_blocks; blk++) 980 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk]; 981 ref_bap += AC3_MAX_COEFS * s->num_blocks; 982 } 983 s->ref_bap_set = 1; 984} 985 986 987/** 988 * Initialize mantissa counts. 989 * These are set so that they are padded to the next whole group size when bits 990 * are counted in compute_mantissa_size. 991 * 992 * @param[in,out] mant_cnt running counts for each bap value for each block 993 */ 994static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16]) 995{ 996 int blk; 997 998 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { 999 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk])); 1000 mant_cnt[blk][1] = mant_cnt[blk][2] = 2; 1001 mant_cnt[blk][4] = 1; 1002 } 1003} 1004 1005 1006/** 1007 * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth 1008 * range. 1009 * 1010 * @param s AC-3 encoder private context 1011 * @param ch channel index 1012 * @param[in,out] mant_cnt running counts for each bap value for each block 1013 * @param start starting coefficient bin 1014 * @param end ending coefficient bin 1015 */ 1016static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch, 1017 uint16_t mant_cnt[AC3_MAX_BLOCKS][16], 1018 int start, int end) 1019{ 1020 int blk; 1021 1022 for (blk = 0; blk < s->num_blocks; blk++) { 1023 AC3Block *block = &s->blocks[blk]; 1024 if (ch == CPL_CH && !block->cpl_in_use) 1025 continue; 1026 s->ac3dsp.update_bap_counts(mant_cnt[blk], 1027 s->ref_bap[ch][blk] + start, 1028 FFMIN(end, block->end_freq[ch]) - start); 1029 } 1030} 1031 1032 1033/* 1034 * Count the number of mantissa bits in the frame based on the bap values. 1035 */ 1036static int count_mantissa_bits(AC3EncodeContext *s) 1037{ 1038 int ch, max_end_freq; 1039 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]); 1040 1041 count_mantissa_bits_init(mant_cnt); 1042 1043 max_end_freq = s->bandwidth_code * 3 + 73; 1044 for (ch = !s->cpl_enabled; ch <= s->channels; ch++) 1045 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch], 1046 max_end_freq); 1047 1048 return s->ac3dsp.compute_mantissa_size(mant_cnt); 1049} 1050 1051 1052/** 1053 * Run the bit allocation with a given SNR offset. 1054 * This calculates the bit allocation pointers that will be used to determine 1055 * the quantization of each mantissa. 1056 * 1057 * @param s AC-3 encoder private context 1058 * @param snr_offset SNR offset, 0 to 1023 1059 * @return the number of bits needed for mantissas if the given SNR offset is 1060 * is used. 1061 */ 1062static int bit_alloc(AC3EncodeContext *s, int snr_offset) 1063{ 1064 int blk, ch; 1065 1066 snr_offset = (snr_offset - 240) << 2; 1067 1068 reset_block_bap(s); 1069 for (blk = 0; blk < s->num_blocks; blk++) { 1070 AC3Block *block = &s->blocks[blk]; 1071 1072 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 1073 /* Currently the only bit allocation parameters which vary across 1074 blocks within a frame are the exponent values. We can take 1075 advantage of that by reusing the bit allocation pointers 1076 whenever we reuse exponents. */ 1077 if (s->exp_strategy[ch][blk] != EXP_REUSE) { 1078 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch], 1079 s->start_freq[ch], block->end_freq[ch], 1080 snr_offset, s->bit_alloc.floor, 1081 ff_ac3_bap_tab, s->ref_bap[ch][blk]); 1082 } 1083 } 1084 } 1085 return count_mantissa_bits(s); 1086} 1087 1088 1089/* 1090 * Constant bitrate bit allocation search. 1091 * Find the largest SNR offset that will allow data to fit in the frame. 1092 */ 1093static int cbr_bit_allocation(AC3EncodeContext *s) 1094{ 1095 int ch; 1096 int bits_left; 1097 int snr_offset, snr_incr; 1098 1099 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits); 1100 if (bits_left < 0) 1101 return AVERROR(EINVAL); 1102 1103 snr_offset = s->coarse_snr_offset << 4; 1104 1105 /* if previous frame SNR offset was 1023, check if current frame can also 1106 use SNR offset of 1023. if so, skip the search. */ 1107 if ((snr_offset | s->fine_snr_offset[1]) == 1023) { 1108 if (bit_alloc(s, 1023) <= bits_left) 1109 return 0; 1110 } 1111 1112 while (snr_offset >= 0 && 1113 bit_alloc(s, snr_offset) > bits_left) { 1114 snr_offset -= 64; 1115 } 1116 if (snr_offset < 0) 1117 return AVERROR(EINVAL); 1118 1119 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); 1120 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) { 1121 while (snr_offset + snr_incr <= 1023 && 1122 bit_alloc(s, snr_offset + snr_incr) <= bits_left) { 1123 snr_offset += snr_incr; 1124 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); 1125 } 1126 } 1127 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); 1128 reset_block_bap(s); 1129 1130 s->coarse_snr_offset = snr_offset >> 4; 1131 for (ch = !s->cpl_on; ch <= s->channels; ch++) 1132 s->fine_snr_offset[ch] = snr_offset & 0xF; 1133 1134 return 0; 1135} 1136 1137 1138/* 1139 * Perform bit allocation search. 1140 * Finds the SNR offset value that maximizes quality and fits in the specified 1141 * frame size. Output is the SNR offset and a set of bit allocation pointers 1142 * used to quantize the mantissas. 1143 */ 1144int ff_ac3_compute_bit_allocation(AC3EncodeContext *s) 1145{ 1146 count_frame_bits(s); 1147 1148 s->exponent_bits = count_exponent_bits(s); 1149 1150 bit_alloc_masking(s); 1151 1152 return cbr_bit_allocation(s); 1153} 1154 1155 1156/** 1157 * Symmetric quantization on 'levels' levels. 1158 * 1159 * @param c unquantized coefficient 1160 * @param e exponent 1161 * @param levels number of quantization levels 1162 * @return quantized coefficient 1163 */ 1164static inline int sym_quant(int c, int e, int levels) 1165{ 1166 int v = (((levels * c) >> (24 - e)) + levels) >> 1; 1167 av_assert2(v >= 0 && v < levels); 1168 return v; 1169} 1170 1171 1172/** 1173 * Asymmetric quantization on 2^qbits levels. 1174 * 1175 * @param c unquantized coefficient 1176 * @param e exponent 1177 * @param qbits number of quantization bits 1178 * @return quantized coefficient 1179 */ 1180static inline int asym_quant(int c, int e, int qbits) 1181{ 1182 int m; 1183 1184 c = (((c << e) >> (24 - qbits)) + 1) >> 1; 1185 m = (1 << (qbits-1)); 1186 if (c >= m) 1187 c = m - 1; 1188 av_assert2(c >= -m); 1189 return c; 1190} 1191 1192 1193/** 1194 * Quantize a set of mantissas for a single channel in a single block. 1195 * 1196 * @param s Mantissa count context 1197 * @param fixed_coef unquantized fixed-point coefficients 1198 * @param exp exponents 1199 * @param bap bit allocation pointer indices 1200 * @param[out] qmant quantized coefficients 1201 * @param start_freq starting coefficient bin 1202 * @param end_freq ending coefficient bin 1203 */ 1204static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef, 1205 uint8_t *exp, uint8_t *bap, 1206 int16_t *qmant, int start_freq, 1207 int end_freq) 1208{ 1209 int i; 1210 1211 for (i = start_freq; i < end_freq; i++) { 1212 int c = fixed_coef[i]; 1213 int e = exp[i]; 1214 int v = bap[i]; 1215 if (v) 1216 switch (v) { 1217 case 1: 1218 v = sym_quant(c, e, 3); 1219 switch (s->mant1_cnt) { 1220 case 0: 1221 s->qmant1_ptr = &qmant[i]; 1222 v = 9 * v; 1223 s->mant1_cnt = 1; 1224 break; 1225 case 1: 1226 *s->qmant1_ptr += 3 * v; 1227 s->mant1_cnt = 2; 1228 v = 128; 1229 break; 1230 default: 1231 *s->qmant1_ptr += v; 1232 s->mant1_cnt = 0; 1233 v = 128; 1234 break; 1235 } 1236 break; 1237 case 2: 1238 v = sym_quant(c, e, 5); 1239 switch (s->mant2_cnt) { 1240 case 0: 1241 s->qmant2_ptr = &qmant[i]; 1242 v = 25 * v; 1243 s->mant2_cnt = 1; 1244 break; 1245 case 1: 1246 *s->qmant2_ptr += 5 * v; 1247 s->mant2_cnt = 2; 1248 v = 128; 1249 break; 1250 default: 1251 *s->qmant2_ptr += v; 1252 s->mant2_cnt = 0; 1253 v = 128; 1254 break; 1255 } 1256 break; 1257 case 3: 1258 v = sym_quant(c, e, 7); 1259 break; 1260 case 4: 1261 v = sym_quant(c, e, 11); 1262 switch (s->mant4_cnt) { 1263 case 0: 1264 s->qmant4_ptr = &qmant[i]; 1265 v = 11 * v; 1266 s->mant4_cnt = 1; 1267 break; 1268 default: 1269 *s->qmant4_ptr += v; 1270 s->mant4_cnt = 0; 1271 v = 128; 1272 break; 1273 } 1274 break; 1275 case 5: 1276 v = sym_quant(c, e, 15); 1277 break; 1278 case 14: 1279 v = asym_quant(c, e, 14); 1280 break; 1281 case 15: 1282 v = asym_quant(c, e, 16); 1283 break; 1284 default: 1285 v = asym_quant(c, e, v - 1); 1286 break; 1287 } 1288 qmant[i] = v; 1289 } 1290} 1291 1292 1293/** 1294 * Quantize mantissas using coefficients, exponents, and bit allocation pointers. 1295 * 1296 * @param s AC-3 encoder private context 1297 */ 1298void ff_ac3_quantize_mantissas(AC3EncodeContext *s) 1299{ 1300 int blk, ch, ch0=0, got_cpl; 1301 1302 for (blk = 0; blk < s->num_blocks; blk++) { 1303 AC3Block *block = &s->blocks[blk]; 1304 AC3Mant m = { 0 }; 1305 1306 got_cpl = !block->cpl_in_use; 1307 for (ch = 1; ch <= s->channels; ch++) { 1308 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { 1309 ch0 = ch - 1; 1310 ch = CPL_CH; 1311 got_cpl = 1; 1312 } 1313 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch], 1314 s->blocks[s->exp_ref_block[ch][blk]].exp[ch], 1315 s->ref_bap[ch][blk], block->qmant[ch], 1316 s->start_freq[ch], block->end_freq[ch]); 1317 if (ch == CPL_CH) 1318 ch = ch0; 1319 } 1320 } 1321} 1322 1323 1324/* 1325 * Write the AC-3 frame header to the output bitstream. 1326 */ 1327static void ac3_output_frame_header(AC3EncodeContext *s) 1328{ 1329 AC3EncOptions *opt = &s->options; 1330 1331 put_bits(&s->pb, 16, 0x0b77); /* frame header */ 1332 put_bits(&s->pb, 16, 0); /* crc1: will be filled later */ 1333 put_bits(&s->pb, 2, s->bit_alloc.sr_code); 1334 put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2); 1335 put_bits(&s->pb, 5, s->bitstream_id); 1336 put_bits(&s->pb, 3, s->bitstream_mode); 1337 put_bits(&s->pb, 3, s->channel_mode); 1338 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO) 1339 put_bits(&s->pb, 2, s->center_mix_level); 1340 if (s->channel_mode & 0x04) 1341 put_bits(&s->pb, 2, s->surround_mix_level); 1342 if (s->channel_mode == AC3_CHMODE_STEREO) 1343 put_bits(&s->pb, 2, opt->dolby_surround_mode); 1344 put_bits(&s->pb, 1, s->lfe_on); /* LFE */ 1345 put_bits(&s->pb, 5, -opt->dialogue_level); 1346 put_bits(&s->pb, 1, 0); /* no compression control word */ 1347 put_bits(&s->pb, 1, 0); /* no lang code */ 1348 put_bits(&s->pb, 1, opt->audio_production_info); 1349 if (opt->audio_production_info) { 1350 put_bits(&s->pb, 5, opt->mixing_level - 80); 1351 put_bits(&s->pb, 2, opt->room_type); 1352 } 1353 put_bits(&s->pb, 1, opt->copyright); 1354 put_bits(&s->pb, 1, opt->original); 1355 if (s->bitstream_id == 6) { 1356 /* alternate bit stream syntax */ 1357 put_bits(&s->pb, 1, opt->extended_bsi_1); 1358 if (opt->extended_bsi_1) { 1359 put_bits(&s->pb, 2, opt->preferred_stereo_downmix); 1360 put_bits(&s->pb, 3, s->ltrt_center_mix_level); 1361 put_bits(&s->pb, 3, s->ltrt_surround_mix_level); 1362 put_bits(&s->pb, 3, s->loro_center_mix_level); 1363 put_bits(&s->pb, 3, s->loro_surround_mix_level); 1364 } 1365 put_bits(&s->pb, 1, opt->extended_bsi_2); 1366 if (opt->extended_bsi_2) { 1367 put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); 1368 put_bits(&s->pb, 2, opt->dolby_headphone_mode); 1369 put_bits(&s->pb, 1, opt->ad_converter_type); 1370 put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */ 1371 } 1372 } else { 1373 put_bits(&s->pb, 1, 0); /* no time code 1 */ 1374 put_bits(&s->pb, 1, 0); /* no time code 2 */ 1375 } 1376 put_bits(&s->pb, 1, 0); /* no additional bit stream info */ 1377} 1378 1379 1380/* 1381 * Write one audio block to the output bitstream. 1382 */ 1383static void output_audio_block(AC3EncodeContext *s, int blk) 1384{ 1385 int ch, i, baie, bnd, got_cpl, av_uninit(ch0); 1386 AC3Block *block = &s->blocks[blk]; 1387 1388 /* block switching */ 1389 if (!s->eac3) { 1390 for (ch = 0; ch < s->fbw_channels; ch++) 1391 put_bits(&s->pb, 1, 0); 1392 } 1393 1394 /* dither flags */ 1395 if (!s->eac3) { 1396 for (ch = 0; ch < s->fbw_channels; ch++) 1397 put_bits(&s->pb, 1, 1); 1398 } 1399 1400 /* dynamic range codes */ 1401 put_bits(&s->pb, 1, 0); 1402 1403 /* spectral extension */ 1404 if (s->eac3) 1405 put_bits(&s->pb, 1, 0); 1406 1407 /* channel coupling */ 1408 if (!s->eac3) 1409 put_bits(&s->pb, 1, block->new_cpl_strategy); 1410 if (block->new_cpl_strategy) { 1411 if (!s->eac3) 1412 put_bits(&s->pb, 1, block->cpl_in_use); 1413 if (block->cpl_in_use) { 1414 int start_sub, end_sub; 1415 if (s->eac3) 1416 put_bits(&s->pb, 1, 0); /* enhanced coupling */ 1417 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) { 1418 for (ch = 1; ch <= s->fbw_channels; ch++) 1419 put_bits(&s->pb, 1, block->channel_in_cpl[ch]); 1420 } 1421 if (s->channel_mode == AC3_CHMODE_STEREO) 1422 put_bits(&s->pb, 1, 0); /* phase flags in use */ 1423 start_sub = (s->start_freq[CPL_CH] - 37) / 12; 1424 end_sub = (s->cpl_end_freq - 37) / 12; 1425 put_bits(&s->pb, 4, start_sub); 1426 put_bits(&s->pb, 4, end_sub - 3); 1427 /* coupling band structure */ 1428 if (s->eac3) { 1429 put_bits(&s->pb, 1, 0); /* use default */ 1430 } else { 1431 for (bnd = start_sub+1; bnd < end_sub; bnd++) 1432 put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]); 1433 } 1434 } 1435 } 1436 1437 /* coupling coordinates */ 1438 if (block->cpl_in_use) { 1439 for (ch = 1; ch <= s->fbw_channels; ch++) { 1440 if (block->channel_in_cpl[ch]) { 1441 if (!s->eac3 || block->new_cpl_coords[ch] != 2) 1442 put_bits(&s->pb, 1, block->new_cpl_coords[ch]); 1443 if (block->new_cpl_coords[ch]) { 1444 put_bits(&s->pb, 2, block->cpl_master_exp[ch]); 1445 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { 1446 put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]); 1447 put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]); 1448 } 1449 } 1450 } 1451 } 1452 } 1453 1454 /* stereo rematrixing */ 1455 if (s->channel_mode == AC3_CHMODE_STEREO) { 1456 if (!s->eac3 || blk > 0) 1457 put_bits(&s->pb, 1, block->new_rematrixing_strategy); 1458 if (block->new_rematrixing_strategy) { 1459 /* rematrixing flags */ 1460 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) 1461 put_bits(&s->pb, 1, block->rematrixing_flags[bnd]); 1462 } 1463 } 1464 1465 /* exponent strategy */ 1466 if (!s->eac3) { 1467 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++) 1468 put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); 1469 if (s->lfe_on) 1470 put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); 1471 } 1472 1473 /* bandwidth */ 1474 for (ch = 1; ch <= s->fbw_channels; ch++) { 1475 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch]) 1476 put_bits(&s->pb, 6, s->bandwidth_code); 1477 } 1478 1479 /* exponents */ 1480 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 1481 int nb_groups; 1482 int cpl = (ch == CPL_CH); 1483 1484 if (s->exp_strategy[ch][blk] == EXP_REUSE) 1485 continue; 1486 1487 /* DC exponent */ 1488 put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl); 1489 1490 /* exponent groups */ 1491 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]]; 1492 for (i = 1; i <= nb_groups; i++) 1493 put_bits(&s->pb, 7, block->grouped_exp[ch][i]); 1494 1495 /* gain range info */ 1496 if (ch != s->lfe_channel && !cpl) 1497 put_bits(&s->pb, 2, 0); 1498 } 1499 1500 /* bit allocation info */ 1501 if (!s->eac3) { 1502 baie = (blk == 0); 1503 put_bits(&s->pb, 1, baie); 1504 if (baie) { 1505 put_bits(&s->pb, 2, s->slow_decay_code); 1506 put_bits(&s->pb, 2, s->fast_decay_code); 1507 put_bits(&s->pb, 2, s->slow_gain_code); 1508 put_bits(&s->pb, 2, s->db_per_bit_code); 1509 put_bits(&s->pb, 3, s->floor_code); 1510 } 1511 } 1512 1513 /* snr offset */ 1514 if (!s->eac3) { 1515 put_bits(&s->pb, 1, block->new_snr_offsets); 1516 if (block->new_snr_offsets) { 1517 put_bits(&s->pb, 6, s->coarse_snr_offset); 1518 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 1519 put_bits(&s->pb, 4, s->fine_snr_offset[ch]); 1520 put_bits(&s->pb, 3, s->fast_gain_code[ch]); 1521 } 1522 } 1523 } else { 1524 put_bits(&s->pb, 1, 0); /* no converter snr offset */ 1525 } 1526 1527 /* coupling leak */ 1528 if (block->cpl_in_use) { 1529 if (!s->eac3 || block->new_cpl_leak != 2) 1530 put_bits(&s->pb, 1, block->new_cpl_leak); 1531 if (block->new_cpl_leak) { 1532 put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak); 1533 put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak); 1534 } 1535 } 1536 1537 if (!s->eac3) { 1538 put_bits(&s->pb, 1, 0); /* no delta bit allocation */ 1539 put_bits(&s->pb, 1, 0); /* no data to skip */ 1540 } 1541 1542 /* mantissas */ 1543 got_cpl = !block->cpl_in_use; 1544 for (ch = 1; ch <= s->channels; ch++) { 1545 int b, q; 1546 1547 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { 1548 ch0 = ch - 1; 1549 ch = CPL_CH; 1550 got_cpl = 1; 1551 } 1552 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) { 1553 q = block->qmant[ch][i]; 1554 b = s->ref_bap[ch][blk][i]; 1555 switch (b) { 1556 case 0: break; 1557 case 1: if (q != 128) put_bits (&s->pb, 5, q); break; 1558 case 2: if (q != 128) put_bits (&s->pb, 7, q); break; 1559 case 3: put_sbits(&s->pb, 3, q); break; 1560 case 4: if (q != 128) put_bits (&s->pb, 7, q); break; 1561 case 14: put_sbits(&s->pb, 14, q); break; 1562 case 15: put_sbits(&s->pb, 16, q); break; 1563 default: put_sbits(&s->pb, b-1, q); break; 1564 } 1565 } 1566 if (ch == CPL_CH) 1567 ch = ch0; 1568 } 1569} 1570 1571 1572/** CRC-16 Polynomial */ 1573#define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16)) 1574 1575 1576static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly) 1577{ 1578 unsigned int c; 1579 1580 c = 0; 1581 while (a) { 1582 if (a & 1) 1583 c ^= b; 1584 a = a >> 1; 1585 b = b << 1; 1586 if (b & (1 << 16)) 1587 b ^= poly; 1588 } 1589 return c; 1590} 1591 1592 1593static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly) 1594{ 1595 unsigned int r; 1596 r = 1; 1597 while (n) { 1598 if (n & 1) 1599 r = mul_poly(r, a, poly); 1600 a = mul_poly(a, a, poly); 1601 n >>= 1; 1602 } 1603 return r; 1604} 1605 1606 1607/* 1608 * Fill the end of the frame with 0's and compute the two CRCs. 1609 */ 1610static void output_frame_end(AC3EncodeContext *s) 1611{ 1612 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI); 1613 int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv; 1614 uint8_t *frame; 1615 1616 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1; 1617 1618 /* pad the remainder of the frame with zeros */ 1619 av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18); 1620 flush_put_bits(&s->pb); 1621 frame = s->pb.buf; 1622 pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2; 1623 av_assert2(pad_bytes >= 0); 1624 if (pad_bytes > 0) 1625 memset(put_bits_ptr(&s->pb), 0, pad_bytes); 1626 1627 if (s->eac3) { 1628 /* compute crc2 */ 1629 crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5); 1630 } else { 1631 /* compute crc1 */ 1632 /* this is not so easy because it is at the beginning of the data... */ 1633 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4)); 1634 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min]; 1635 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY); 1636 AV_WB16(frame + 2, crc1); 1637 1638 /* compute crc2 */ 1639 crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58, 1640 s->frame_size - frame_size_58 - 3); 1641 } 1642 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); 1643 /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */ 1644 if (crc2 == 0x770B) { 1645 frame[s->frame_size - 3] ^= 0x1; 1646 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); 1647 } 1648 crc2 = av_bswap16(crc2); 1649 AV_WB16(frame + s->frame_size - 2, crc2); 1650} 1651 1652 1653/** 1654 * Write the frame to the output bitstream. 1655 * 1656 * @param s AC-3 encoder private context 1657 * @param frame output data buffer 1658 */ 1659void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame) 1660{ 1661 int blk; 1662 1663 init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); 1664 1665 s->output_frame_header(s); 1666 1667 for (blk = 0; blk < s->num_blocks; blk++) 1668 output_audio_block(s, blk); 1669 1670 output_frame_end(s); 1671} 1672 1673 1674static void dprint_options(AC3EncodeContext *s) 1675{ 1676#ifdef DEBUG 1677 AVCodecContext *avctx = s->avctx; 1678 AC3EncOptions *opt = &s->options; 1679 char strbuf[32]; 1680 1681 switch (s->bitstream_id) { 1682 case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break; 1683 case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break; 1684 case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break; 1685 case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break; 1686 case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break; 1687 default: snprintf(strbuf, 32, "ERROR"); 1688 } 1689 av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id); 1690 av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt)); 1691 av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout); 1692 av_dlog(avctx, "channel_layout: %s\n", strbuf); 1693 av_dlog(avctx, "sample_rate: %d\n", s->sample_rate); 1694 av_dlog(avctx, "bit_rate: %d\n", s->bit_rate); 1695 av_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code); 1696 if (s->cutoff) 1697 av_dlog(avctx, "cutoff: %d\n", s->cutoff); 1698 1699 av_dlog(avctx, "per_frame_metadata: %s\n", 1700 opt->allow_per_frame_metadata?"on":"off"); 1701 if (s->has_center) 1702 av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level, 1703 s->center_mix_level); 1704 else 1705 av_dlog(avctx, "center_mixlev: {not written}\n"); 1706 if (s->has_surround) 1707 av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level, 1708 s->surround_mix_level); 1709 else 1710 av_dlog(avctx, "surround_mixlev: {not written}\n"); 1711 if (opt->audio_production_info) { 1712 av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level); 1713 switch (opt->room_type) { 1714 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1715 case AC3ENC_OPT_LARGE_ROOM: av_strlcpy(strbuf, "large", 32); break; 1716 case AC3ENC_OPT_SMALL_ROOM: av_strlcpy(strbuf, "small", 32); break; 1717 default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type); 1718 } 1719 av_dlog(avctx, "room_type: %s\n", strbuf); 1720 } else { 1721 av_dlog(avctx, "mixing_level: {not written}\n"); 1722 av_dlog(avctx, "room_type: {not written}\n"); 1723 } 1724 av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off"); 1725 av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level); 1726 if (s->channel_mode == AC3_CHMODE_STEREO) { 1727 switch (opt->dolby_surround_mode) { 1728 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1729 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; 1730 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; 1731 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode); 1732 } 1733 av_dlog(avctx, "dsur_mode: %s\n", strbuf); 1734 } else { 1735 av_dlog(avctx, "dsur_mode: {not written}\n"); 1736 } 1737 av_dlog(avctx, "original: %s\n", opt->original?"on":"off"); 1738 1739 if (s->bitstream_id == 6) { 1740 if (opt->extended_bsi_1) { 1741 switch (opt->preferred_stereo_downmix) { 1742 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1743 case AC3ENC_OPT_DOWNMIX_LTRT: av_strlcpy(strbuf, "ltrt", 32); break; 1744 case AC3ENC_OPT_DOWNMIX_LORO: av_strlcpy(strbuf, "loro", 32); break; 1745 default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix); 1746 } 1747 av_dlog(avctx, "dmix_mode: %s\n", strbuf); 1748 av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n", 1749 opt->ltrt_center_mix_level, s->ltrt_center_mix_level); 1750 av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n", 1751 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level); 1752 av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n", 1753 opt->loro_center_mix_level, s->loro_center_mix_level); 1754 av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n", 1755 opt->loro_surround_mix_level, s->loro_surround_mix_level); 1756 } else { 1757 av_dlog(avctx, "extended bitstream info 1: {not written}\n"); 1758 } 1759 if (opt->extended_bsi_2) { 1760 switch (opt->dolby_surround_ex_mode) { 1761 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1762 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; 1763 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; 1764 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode); 1765 } 1766 av_dlog(avctx, "dsurex_mode: %s\n", strbuf); 1767 switch (opt->dolby_headphone_mode) { 1768 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1769 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; 1770 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; 1771 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode); 1772 } 1773 av_dlog(avctx, "dheadphone_mode: %s\n", strbuf); 1774 1775 switch (opt->ad_converter_type) { 1776 case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break; 1777 case AC3ENC_OPT_ADCONV_HDCD: av_strlcpy(strbuf, "hdcd", 32); break; 1778 default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type); 1779 } 1780 av_dlog(avctx, "ad_conv_type: %s\n", strbuf); 1781 } else { 1782 av_dlog(avctx, "extended bitstream info 2: {not written}\n"); 1783 } 1784 } 1785#endif 1786} 1787 1788 1789#define FLT_OPTION_THRESHOLD 0.01 1790 1791static int validate_float_option(float v, const float *v_list, int v_list_size) 1792{ 1793 int i; 1794 1795 for (i = 0; i < v_list_size; i++) { 1796 if (v < (v_list[i] + FLT_OPTION_THRESHOLD) && 1797 v > (v_list[i] - FLT_OPTION_THRESHOLD)) 1798 break; 1799 } 1800 if (i == v_list_size) 1801 return -1; 1802 1803 return i; 1804} 1805 1806 1807static void validate_mix_level(void *log_ctx, const char *opt_name, 1808 float *opt_param, const float *list, 1809 int list_size, int default_value, int min_value, 1810 int *ctx_param) 1811{ 1812 int mixlev = validate_float_option(*opt_param, list, list_size); 1813 if (mixlev < min_value) { 1814 mixlev = default_value; 1815 if (*opt_param >= 0.0) { 1816 av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using " 1817 "default value: %0.3f\n", opt_name, list[mixlev]); 1818 } 1819 } 1820 *opt_param = list[mixlev]; 1821 *ctx_param = mixlev; 1822} 1823 1824 1825/** 1826 * Validate metadata options as set by AVOption system. 1827 * These values can optionally be changed per-frame. 1828 * 1829 * @param s AC-3 encoder private context 1830 */ 1831int ff_ac3_validate_metadata(AC3EncodeContext *s) 1832{ 1833 AVCodecContext *avctx = s->avctx; 1834 AC3EncOptions *opt = &s->options; 1835 1836 opt->audio_production_info = 0; 1837 opt->extended_bsi_1 = 0; 1838 opt->extended_bsi_2 = 0; 1839 opt->eac3_mixing_metadata = 0; 1840 opt->eac3_info_metadata = 0; 1841 1842 /* determine mixing metadata / xbsi1 use */ 1843 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) { 1844 opt->extended_bsi_1 = 1; 1845 opt->eac3_mixing_metadata = 1; 1846 } 1847 if (s->has_center && 1848 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) { 1849 opt->extended_bsi_1 = 1; 1850 opt->eac3_mixing_metadata = 1; 1851 } 1852 if (s->has_surround && 1853 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) { 1854 opt->extended_bsi_1 = 1; 1855 opt->eac3_mixing_metadata = 1; 1856 } 1857 1858 if (s->eac3) { 1859 /* determine info metadata use */ 1860 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN) 1861 opt->eac3_info_metadata = 1; 1862 if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE) 1863 opt->eac3_info_metadata = 1; 1864 if (s->channel_mode == AC3_CHMODE_STEREO && 1865 (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE)) 1866 opt->eac3_info_metadata = 1; 1867 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) 1868 opt->eac3_info_metadata = 1; 1869 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE || 1870 opt->ad_converter_type != AC3ENC_OPT_NONE) { 1871 opt->audio_production_info = 1; 1872 opt->eac3_info_metadata = 1; 1873 } 1874 } else { 1875 /* determine audio production info use */ 1876 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE) 1877 opt->audio_production_info = 1; 1878 1879 /* determine xbsi2 use */ 1880 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) 1881 opt->extended_bsi_2 = 1; 1882 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE) 1883 opt->extended_bsi_2 = 1; 1884 if (opt->ad_converter_type != AC3ENC_OPT_NONE) 1885 opt->extended_bsi_2 = 1; 1886 } 1887 1888 /* validate AC-3 mixing levels */ 1889 if (!s->eac3) { 1890 if (s->has_center) { 1891 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level, 1892 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0, 1893 &s->center_mix_level); 1894 } 1895 if (s->has_surround) { 1896 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level, 1897 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0, 1898 &s->surround_mix_level); 1899 } 1900 } 1901 1902 /* validate extended bsi 1 / mixing metadata */ 1903 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) { 1904 /* default preferred stereo downmix */ 1905 if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE) 1906 opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED; 1907 if (!s->eac3 || s->has_center) { 1908 /* validate Lt/Rt center mix level */ 1909 validate_mix_level(avctx, "ltrt_center_mix_level", 1910 &opt->ltrt_center_mix_level, extmixlev_options, 1911 EXTMIXLEV_NUM_OPTIONS, 5, 0, 1912 &s->ltrt_center_mix_level); 1913 /* validate Lo/Ro center mix level */ 1914 validate_mix_level(avctx, "loro_center_mix_level", 1915 &opt->loro_center_mix_level, extmixlev_options, 1916 EXTMIXLEV_NUM_OPTIONS, 5, 0, 1917 &s->loro_center_mix_level); 1918 } 1919 if (!s->eac3 || s->has_surround) { 1920 /* validate Lt/Rt surround mix level */ 1921 validate_mix_level(avctx, "ltrt_surround_mix_level", 1922 &opt->ltrt_surround_mix_level, extmixlev_options, 1923 EXTMIXLEV_NUM_OPTIONS, 6, 3, 1924 &s->ltrt_surround_mix_level); 1925 /* validate Lo/Ro surround mix level */ 1926 validate_mix_level(avctx, "loro_surround_mix_level", 1927 &opt->loro_surround_mix_level, extmixlev_options, 1928 EXTMIXLEV_NUM_OPTIONS, 6, 3, 1929 &s->loro_surround_mix_level); 1930 } 1931 } 1932 1933 /* validate audio service type / channels combination */ 1934 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE && 1935 avctx->channels == 1) || 1936 ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY || 1937 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY || 1938 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER) 1939 && avctx->channels > 1)) { 1940 av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the " 1941 "specified number of channels\n"); 1942 return AVERROR(EINVAL); 1943 } 1944 1945 /* validate extended bsi 2 / info metadata */ 1946 if (opt->extended_bsi_2 || opt->eac3_info_metadata) { 1947 /* default dolby headphone mode */ 1948 if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE) 1949 opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED; 1950 /* default dolby surround ex mode */ 1951 if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE) 1952 opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED; 1953 /* default A/D converter type */ 1954 if (opt->ad_converter_type == AC3ENC_OPT_NONE) 1955 opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD; 1956 } 1957 1958 /* copyright & original defaults */ 1959 if (!s->eac3 || opt->eac3_info_metadata) { 1960 /* default copyright */ 1961 if (opt->copyright == AC3ENC_OPT_NONE) 1962 opt->copyright = AC3ENC_OPT_OFF; 1963 /* default original */ 1964 if (opt->original == AC3ENC_OPT_NONE) 1965 opt->original = AC3ENC_OPT_ON; 1966 } 1967 1968 /* dolby surround mode default */ 1969 if (!s->eac3 || opt->eac3_info_metadata) { 1970 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE) 1971 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED; 1972 } 1973 1974 /* validate audio production info */ 1975 if (opt->audio_production_info) { 1976 if (opt->mixing_level == AC3ENC_OPT_NONE) { 1977 av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if " 1978 "room_type is set\n"); 1979 return AVERROR(EINVAL); 1980 } 1981 if (opt->mixing_level < 80) { 1982 av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between " 1983 "80dB and 111dB\n"); 1984 return AVERROR(EINVAL); 1985 } 1986 /* default room type */ 1987 if (opt->room_type == AC3ENC_OPT_NONE) 1988 opt->room_type = AC3ENC_OPT_NOT_INDICATED; 1989 } 1990 1991 /* set bitstream id for alternate bitstream syntax */ 1992 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) { 1993 if (s->bitstream_id > 8 && s->bitstream_id < 11) { 1994 static int warn_once = 1; 1995 if (warn_once) { 1996 av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is " 1997 "not compatible with reduced samplerates. writing of " 1998 "extended bitstream information will be disabled.\n"); 1999 warn_once = 0; 2000 } 2001 } else { 2002 s->bitstream_id = 6; 2003 } 2004 } 2005 2006 return 0; 2007} 2008 2009 2010/** 2011 * Finalize encoding and free any memory allocated by the encoder. 2012 * 2013 * @param avctx Codec context 2014 */ 2015av_cold int ff_ac3_encode_close(AVCodecContext *avctx) 2016{ 2017 int blk, ch; 2018 AC3EncodeContext *s = avctx->priv_data; 2019 2020 av_freep(&s->windowed_samples); 2021 if (s->planar_samples) 2022 for (ch = 0; ch < s->channels; ch++) 2023 av_freep(&s->planar_samples[ch]); 2024 av_freep(&s->planar_samples); 2025 av_freep(&s->bap_buffer); 2026 av_freep(&s->bap1_buffer); 2027 av_freep(&s->mdct_coef_buffer); 2028 av_freep(&s->fixed_coef_buffer); 2029 av_freep(&s->exp_buffer); 2030 av_freep(&s->grouped_exp_buffer); 2031 av_freep(&s->psd_buffer); 2032 av_freep(&s->band_psd_buffer); 2033 av_freep(&s->mask_buffer); 2034 av_freep(&s->qmant_buffer); 2035 av_freep(&s->cpl_coord_exp_buffer); 2036 av_freep(&s->cpl_coord_mant_buffer); 2037 for (blk = 0; blk < s->num_blocks; blk++) { 2038 AC3Block *block = &s->blocks[blk]; 2039 av_freep(&block->mdct_coef); 2040 av_freep(&block->fixed_coef); 2041 av_freep(&block->exp); 2042 av_freep(&block->grouped_exp); 2043 av_freep(&block->psd); 2044 av_freep(&block->band_psd); 2045 av_freep(&block->mask); 2046 av_freep(&block->qmant); 2047 av_freep(&block->cpl_coord_exp); 2048 av_freep(&block->cpl_coord_mant); 2049 } 2050 2051 s->mdct_end(s); 2052 2053 return 0; 2054} 2055 2056 2057/* 2058 * Set channel information during initialization. 2059 */ 2060static av_cold int set_channel_info(AC3EncodeContext *s, int channels, 2061 uint64_t *channel_layout) 2062{ 2063 int ch_layout; 2064 2065 if (channels < 1 || channels > AC3_MAX_CHANNELS) 2066 return AVERROR(EINVAL); 2067 if (*channel_layout > 0x7FF) 2068 return AVERROR(EINVAL); 2069 ch_layout = *channel_layout; 2070 if (!ch_layout) 2071 ch_layout = av_get_default_channel_layout(channels); 2072 2073 s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY); 2074 s->channels = channels; 2075 s->fbw_channels = channels - s->lfe_on; 2076 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1; 2077 if (s->lfe_on) 2078 ch_layout -= AV_CH_LOW_FREQUENCY; 2079 2080 switch (ch_layout) { 2081 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break; 2082 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break; 2083 case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break; 2084 case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break; 2085 case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break; 2086 case AV_CH_LAYOUT_QUAD: 2087 case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break; 2088 case AV_CH_LAYOUT_5POINT0: 2089 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break; 2090 default: 2091 return AVERROR(EINVAL); 2092 } 2093 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO; 2094 s->has_surround = s->channel_mode & 0x04; 2095 2096 s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on]; 2097 *channel_layout = ch_layout; 2098 if (s->lfe_on) 2099 *channel_layout |= AV_CH_LOW_FREQUENCY; 2100 2101 return 0; 2102} 2103 2104 2105static av_cold int validate_options(AC3EncodeContext *s) 2106{ 2107 AVCodecContext *avctx = s->avctx; 2108 int i, ret, max_sr; 2109 2110 /* validate channel layout */ 2111 if (!avctx->channel_layout) { 2112 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The " 2113 "encoder will guess the layout, but it " 2114 "might be incorrect.\n"); 2115 } 2116 ret = set_channel_info(s, avctx->channels, &avctx->channel_layout); 2117 if (ret) { 2118 av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n"); 2119 return ret; 2120 } 2121 2122 /* validate sample rate */ 2123 /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a 2124 decoder that supports half sample rate so we can validate that 2125 the generated files are correct. */ 2126 max_sr = s->eac3 ? 2 : 8; 2127 for (i = 0; i <= max_sr; i++) { 2128 if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate) 2129 break; 2130 } 2131 if (i > max_sr) { 2132 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n"); 2133 return AVERROR(EINVAL); 2134 } 2135 s->sample_rate = avctx->sample_rate; 2136 s->bit_alloc.sr_shift = i / 3; 2137 s->bit_alloc.sr_code = i % 3; 2138 s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift; 2139 2140 /* select a default bit rate if not set by the user */ 2141 if (!avctx->bit_rate) { 2142 switch (s->fbw_channels) { 2143 case 1: avctx->bit_rate = 96000; break; 2144 case 2: avctx->bit_rate = 192000; break; 2145 case 3: avctx->bit_rate = 320000; break; 2146 case 4: avctx->bit_rate = 384000; break; 2147 case 5: avctx->bit_rate = 448000; break; 2148 } 2149 } 2150 2151 /* validate bit rate */ 2152 if (s->eac3) { 2153 int max_br, min_br, wpf, min_br_dist, min_br_code; 2154 int num_blks_code, num_blocks, frame_samples; 2155 2156 /* calculate min/max bitrate */ 2157 /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've 2158 found use either 6 blocks or 1 block, even though 2 or 3 blocks 2159 would work as far as the bit rate is concerned. */ 2160 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) { 2161 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code]; 2162 frame_samples = AC3_BLOCK_SIZE * num_blocks; 2163 max_br = 2048 * s->sample_rate / frame_samples * 16; 2164 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16; 2165 if (avctx->bit_rate <= max_br) 2166 break; 2167 } 2168 if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) { 2169 av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d " 2170 "for this sample rate\n", min_br, max_br); 2171 return AVERROR(EINVAL); 2172 } 2173 s->num_blks_code = num_blks_code; 2174 s->num_blocks = num_blocks; 2175 2176 /* calculate words-per-frame for the selected bitrate */ 2177 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate; 2178 av_assert1(wpf > 0 && wpf <= 2048); 2179 2180 /* find the closest AC-3 bitrate code to the selected bitrate. 2181 this is needed for lookup tables for bandwidth and coupling 2182 parameter selection */ 2183 min_br_code = -1; 2184 min_br_dist = INT_MAX; 2185 for (i = 0; i < 19; i++) { 2186 int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate); 2187 if (br_dist < min_br_dist) { 2188 min_br_dist = br_dist; 2189 min_br_code = i; 2190 } 2191 } 2192 2193 /* make sure the minimum frame size is below the average frame size */ 2194 s->frame_size_code = min_br_code << 1; 2195 while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate) 2196 wpf--; 2197 s->frame_size_min = 2 * wpf; 2198 } else { 2199 int best_br = 0, best_code = 0, best_diff = INT_MAX; 2200 for (i = 0; i < 19; i++) { 2201 int br = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000; 2202 int diff = abs(br - avctx->bit_rate); 2203 if (diff < best_diff) { 2204 best_br = br; 2205 best_code = i; 2206 best_diff = diff; 2207 } 2208 if (!best_diff) 2209 break; 2210 } 2211 avctx->bit_rate = best_br; 2212 s->frame_size_code = best_code << 1; 2213 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code]; 2214 s->num_blks_code = 0x3; 2215 s->num_blocks = 6; 2216 } 2217 s->bit_rate = avctx->bit_rate; 2218 s->frame_size = s->frame_size_min; 2219 2220 /* validate cutoff */ 2221 if (avctx->cutoff < 0) { 2222 av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n"); 2223 return AVERROR(EINVAL); 2224 } 2225 s->cutoff = avctx->cutoff; 2226 if (s->cutoff > (s->sample_rate >> 1)) 2227 s->cutoff = s->sample_rate >> 1; 2228 2229 ret = ff_ac3_validate_metadata(s); 2230 if (ret) 2231 return ret; 2232 2233 s->rematrixing_enabled = s->options.stereo_rematrixing && 2234 (s->channel_mode == AC3_CHMODE_STEREO); 2235 2236 s->cpl_enabled = s->options.channel_coupling && 2237 s->channel_mode >= AC3_CHMODE_STEREO; 2238 2239 return 0; 2240} 2241 2242 2243/* 2244 * Set bandwidth for all channels. 2245 * The user can optionally supply a cutoff frequency. Otherwise an appropriate 2246 * default value will be used. 2247 */ 2248static av_cold void set_bandwidth(AC3EncodeContext *s) 2249{ 2250 int blk, ch, av_uninit(cpl_start); 2251 2252 if (s->cutoff) { 2253 /* calculate bandwidth based on user-specified cutoff frequency */ 2254 int fbw_coeffs; 2255 fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate; 2256 s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60); 2257 } else { 2258 /* use default bandwidth setting */ 2259 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2]; 2260 } 2261 2262 /* set number of coefficients for each channel */ 2263 for (ch = 1; ch <= s->fbw_channels; ch++) { 2264 s->start_freq[ch] = 0; 2265 for (blk = 0; blk < s->num_blocks; blk++) 2266 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73; 2267 } 2268 /* LFE channel always has 7 coefs */ 2269 if (s->lfe_on) { 2270 s->start_freq[s->lfe_channel] = 0; 2271 for (blk = 0; blk < s->num_blocks; blk++) 2272 s->blocks[blk].end_freq[ch] = 7; 2273 } 2274 2275 /* initialize coupling strategy */ 2276 if (s->cpl_enabled) { 2277 if (s->options.cpl_start != AC3ENC_OPT_AUTO) { 2278 cpl_start = s->options.cpl_start; 2279 } else { 2280 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2]; 2281 if (cpl_start < 0) { 2282 if (s->options.channel_coupling == AC3ENC_OPT_AUTO) 2283 s->cpl_enabled = 0; 2284 else 2285 cpl_start = 15; 2286 } 2287 } 2288 } 2289 if (s->cpl_enabled) { 2290 int i, cpl_start_band, cpl_end_band; 2291 uint8_t *cpl_band_sizes = s->cpl_band_sizes; 2292 2293 cpl_end_band = s->bandwidth_code / 4 + 3; 2294 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15)); 2295 2296 s->num_cpl_subbands = cpl_end_band - cpl_start_band; 2297 2298 s->num_cpl_bands = 1; 2299 *cpl_band_sizes = 12; 2300 for (i = cpl_start_band + 1; i < cpl_end_band; i++) { 2301 if (ff_eac3_default_cpl_band_struct[i]) { 2302 *cpl_band_sizes += 12; 2303 } else { 2304 s->num_cpl_bands++; 2305 cpl_band_sizes++; 2306 *cpl_band_sizes = 12; 2307 } 2308 } 2309 2310 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37; 2311 s->cpl_end_freq = cpl_end_band * 12 + 37; 2312 for (blk = 0; blk < s->num_blocks; blk++) 2313 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq; 2314 } 2315} 2316 2317 2318static av_cold int allocate_buffers(AC3EncodeContext *s) 2319{ 2320 AVCodecContext *avctx = s->avctx; 2321 int blk, ch; 2322 int channels = s->channels + 1; /* includes coupling channel */ 2323 int channel_blocks = channels * s->num_blocks; 2324 int total_coefs = AC3_MAX_COEFS * channel_blocks; 2325 2326 if (s->allocate_sample_buffers(s)) 2327 goto alloc_fail; 2328 2329 FF_ALLOC_OR_GOTO(avctx, s->bap_buffer, total_coefs * 2330 sizeof(*s->bap_buffer), alloc_fail); 2331 FF_ALLOC_OR_GOTO(avctx, s->bap1_buffer, total_coefs * 2332 sizeof(*s->bap1_buffer), alloc_fail); 2333 FF_ALLOCZ_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs * 2334 sizeof(*s->mdct_coef_buffer), alloc_fail); 2335 FF_ALLOC_OR_GOTO(avctx, s->exp_buffer, total_coefs * 2336 sizeof(*s->exp_buffer), alloc_fail); 2337 FF_ALLOC_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks * 128 * 2338 sizeof(*s->grouped_exp_buffer), alloc_fail); 2339 FF_ALLOC_OR_GOTO(avctx, s->psd_buffer, total_coefs * 2340 sizeof(*s->psd_buffer), alloc_fail); 2341 FF_ALLOC_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks * 64 * 2342 sizeof(*s->band_psd_buffer), alloc_fail); 2343 FF_ALLOC_OR_GOTO(avctx, s->mask_buffer, channel_blocks * 64 * 2344 sizeof(*s->mask_buffer), alloc_fail); 2345 FF_ALLOC_OR_GOTO(avctx, s->qmant_buffer, total_coefs * 2346 sizeof(*s->qmant_buffer), alloc_fail); 2347 if (s->cpl_enabled) { 2348 FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks * 16 * 2349 sizeof(*s->cpl_coord_exp_buffer), alloc_fail); 2350 FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks * 16 * 2351 sizeof(*s->cpl_coord_mant_buffer), alloc_fail); 2352 } 2353 for (blk = 0; blk < s->num_blocks; blk++) { 2354 AC3Block *block = &s->blocks[blk]; 2355 FF_ALLOCZ_OR_GOTO(avctx, block->mdct_coef, channels * sizeof(*block->mdct_coef), 2356 alloc_fail); 2357 FF_ALLOCZ_OR_GOTO(avctx, block->exp, channels * sizeof(*block->exp), 2358 alloc_fail); 2359 FF_ALLOCZ_OR_GOTO(avctx, block->grouped_exp, channels * sizeof(*block->grouped_exp), 2360 alloc_fail); 2361 FF_ALLOCZ_OR_GOTO(avctx, block->psd, channels * sizeof(*block->psd), 2362 alloc_fail); 2363 FF_ALLOCZ_OR_GOTO(avctx, block->band_psd, channels * sizeof(*block->band_psd), 2364 alloc_fail); 2365 FF_ALLOCZ_OR_GOTO(avctx, block->mask, channels * sizeof(*block->mask), 2366 alloc_fail); 2367 FF_ALLOCZ_OR_GOTO(avctx, block->qmant, channels * sizeof(*block->qmant), 2368 alloc_fail); 2369 if (s->cpl_enabled) { 2370 FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_exp, channels * sizeof(*block->cpl_coord_exp), 2371 alloc_fail); 2372 FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_mant, channels * sizeof(*block->cpl_coord_mant), 2373 alloc_fail); 2374 } 2375 2376 for (ch = 0; ch < channels; ch++) { 2377 /* arrangement: block, channel, coeff */ 2378 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)]; 2379 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; 2380 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)]; 2381 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)]; 2382 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; 2383 if (s->cpl_enabled) { 2384 block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)]; 2385 block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)]; 2386 } 2387 2388 /* arrangement: channel, block, coeff */ 2389 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; 2390 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; 2391 } 2392 } 2393 2394 if (!s->fixed_point) { 2395 FF_ALLOCZ_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs * 2396 sizeof(*s->fixed_coef_buffer), alloc_fail); 2397 for (blk = 0; blk < s->num_blocks; blk++) { 2398 AC3Block *block = &s->blocks[blk]; 2399 FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels * 2400 sizeof(*block->fixed_coef), alloc_fail); 2401 for (ch = 0; ch < channels; ch++) 2402 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; 2403 } 2404 } else { 2405 for (blk = 0; blk < s->num_blocks; blk++) { 2406 AC3Block *block = &s->blocks[blk]; 2407 FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels * 2408 sizeof(*block->fixed_coef), alloc_fail); 2409 for (ch = 0; ch < channels; ch++) 2410 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch]; 2411 } 2412 } 2413 2414 return 0; 2415alloc_fail: 2416 return AVERROR(ENOMEM); 2417} 2418 2419 2420av_cold int ff_ac3_encode_init(AVCodecContext *avctx) 2421{ 2422 AC3EncodeContext *s = avctx->priv_data; 2423 int ret, frame_size_58; 2424 2425 s->avctx = avctx; 2426 2427 s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3; 2428 2429 ff_ac3_common_init(); 2430 2431 ret = validate_options(s); 2432 if (ret) 2433 return ret; 2434 2435 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks; 2436 avctx->delay = AC3_BLOCK_SIZE; 2437 2438 s->bitstream_mode = avctx->audio_service_type; 2439 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE) 2440 s->bitstream_mode = 0x7; 2441 2442 s->bits_written = 0; 2443 s->samples_written = 0; 2444 2445 /* calculate crc_inv for both possible frame sizes */ 2446 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1; 2447 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); 2448 if (s->bit_alloc.sr_code == 1) { 2449 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1; 2450 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); 2451 } 2452 2453 /* set function pointers */ 2454 if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) { 2455 s->mdct_end = ff_ac3_fixed_mdct_end; 2456 s->mdct_init = ff_ac3_fixed_mdct_init; 2457 s->allocate_sample_buffers = ff_ac3_fixed_allocate_sample_buffers; 2458 } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) { 2459 s->mdct_end = ff_ac3_float_mdct_end; 2460 s->mdct_init = ff_ac3_float_mdct_init; 2461 s->allocate_sample_buffers = ff_ac3_float_allocate_sample_buffers; 2462 } 2463 if (CONFIG_EAC3_ENCODER && s->eac3) 2464 s->output_frame_header = ff_eac3_output_frame_header; 2465 else 2466 s->output_frame_header = ac3_output_frame_header; 2467 2468 set_bandwidth(s); 2469 2470 exponent_init(s); 2471 2472 bit_alloc_init(s); 2473 2474 ret = s->mdct_init(s); 2475 if (ret) 2476 goto init_fail; 2477 2478 ret = allocate_buffers(s); 2479 if (ret) 2480 goto init_fail; 2481 2482 ff_audiodsp_init(&s->adsp); 2483 ff_dsputil_init(&s->dsp, avctx); 2484 ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT); 2485 2486 dprint_options(s); 2487 2488 return 0; 2489init_fail: 2490 ff_ac3_encode_close(avctx); 2491 return ret; 2492} 2493