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 Libav. 8 * 9 * Libav 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 * Libav 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 Libav; 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//#define ASSERT_LEVEL 2 30 31#include <stdint.h> 32 33#include "libavutil/audioconvert.h" 34#include "libavutil/avassert.h" 35#include "libavutil/avstring.h" 36#include "libavutil/crc.h" 37#include "libavutil/opt.h" 38#include "avcodec.h" 39#include "put_bits.h" 40#include "dsputil.h" 41#include "ac3dsp.h" 42#include "ac3.h" 43#include "audioconvert.h" 44#include "fft.h" 45#include "ac3enc.h" 46#include "eac3enc.h" 47 48typedef struct AC3Mant { 49 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4 50 int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4 51} AC3Mant; 52 53#define CMIXLEV_NUM_OPTIONS 3 54static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = { 55 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB 56}; 57 58#define SURMIXLEV_NUM_OPTIONS 3 59static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = { 60 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO 61}; 62 63#define EXTMIXLEV_NUM_OPTIONS 8 64static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = { 65 LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB, 66 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO 67}; 68 69 70/** 71 * LUT for number of exponent groups. 72 * exponent_group_tab[coupling][exponent strategy-1][number of coefficients] 73 */ 74static uint8_t exponent_group_tab[2][3][256]; 75 76 77/** 78 * List of supported channel layouts. 79 */ 80const uint64_t ff_ac3_channel_layouts[19] = { 81 AV_CH_LAYOUT_MONO, 82 AV_CH_LAYOUT_STEREO, 83 AV_CH_LAYOUT_2_1, 84 AV_CH_LAYOUT_SURROUND, 85 AV_CH_LAYOUT_2_2, 86 AV_CH_LAYOUT_QUAD, 87 AV_CH_LAYOUT_4POINT0, 88 AV_CH_LAYOUT_5POINT0, 89 AV_CH_LAYOUT_5POINT0_BACK, 90 (AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY), 91 (AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY), 92 (AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY), 93 (AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY), 94 (AV_CH_LAYOUT_2_2 | AV_CH_LOW_FREQUENCY), 95 (AV_CH_LAYOUT_QUAD | AV_CH_LOW_FREQUENCY), 96 (AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY), 97 AV_CH_LAYOUT_5POINT1, 98 AV_CH_LAYOUT_5POINT1_BACK, 99 0 100}; 101 102 103/** 104 * LUT to select the bandwidth code based on the bit rate, sample rate, and 105 * number of full-bandwidth channels. 106 * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code] 107 */ 108static const uint8_t ac3_bandwidth_tab[5][3][19] = { 109// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 110 111 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, 112 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, 113 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, 114 115 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, 116 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, 117 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, 118 119 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 }, 120 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 }, 121 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } }, 122 123 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 }, 124 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 }, 125 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } }, 126 127 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 }, 128 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 }, 129 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } } 130}; 131 132 133/** 134 * LUT to select the coupling start band based on the bit rate, sample rate, and 135 * number of full-bandwidth channels. -1 = coupling off 136 * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code] 137 * 138 * TODO: more testing for optimal parameters. 139 * multi-channel tests at 44.1kHz and 32kHz. 140 */ 141static const int8_t ac3_coupling_start_tab[6][3][19] = { 142// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 143 144 // 2/0 145 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 }, 146 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 }, 147 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 148 149 // 3/0 150 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 151 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 152 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 153 154 // 2/1 - untested 155 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 156 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, 157 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 158 159 // 3/1 160 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 161 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 162 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 163 164 // 2/2 - untested 165 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 166 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, 167 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 168 169 // 3/2 170 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, 171 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, 172 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, 173}; 174 175 176/** 177 * Adjust the frame size to make the average bit rate match the target bit rate. 178 * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3. 179 * 180 * @param s AC-3 encoder private context 181 */ 182void ff_ac3_adjust_frame_size(AC3EncodeContext *s) 183{ 184 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) { 185 s->bits_written -= s->bit_rate; 186 s->samples_written -= s->sample_rate; 187 } 188 s->frame_size = s->frame_size_min + 189 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate); 190 s->bits_written += s->frame_size * 8; 191 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks; 192} 193 194 195/** 196 * Set the initial coupling strategy parameters prior to coupling analysis. 197 * 198 * @param s AC-3 encoder private context 199 */ 200void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s) 201{ 202 int blk, ch; 203 int got_cpl_snr; 204 int num_cpl_blocks; 205 206 /* set coupling use flags for each block/channel */ 207 /* TODO: turn coupling on/off and adjust start band based on bit usage */ 208 for (blk = 0; blk < s->num_blocks; blk++) { 209 AC3Block *block = &s->blocks[blk]; 210 for (ch = 1; ch <= s->fbw_channels; ch++) 211 block->channel_in_cpl[ch] = s->cpl_on; 212 } 213 214 /* enable coupling for each block if at least 2 channels have coupling 215 enabled for that block */ 216 got_cpl_snr = 0; 217 num_cpl_blocks = 0; 218 for (blk = 0; blk < s->num_blocks; blk++) { 219 AC3Block *block = &s->blocks[blk]; 220 block->num_cpl_channels = 0; 221 for (ch = 1; ch <= s->fbw_channels; ch++) 222 block->num_cpl_channels += block->channel_in_cpl[ch]; 223 block->cpl_in_use = block->num_cpl_channels > 1; 224 num_cpl_blocks += block->cpl_in_use; 225 if (!block->cpl_in_use) { 226 block->num_cpl_channels = 0; 227 for (ch = 1; ch <= s->fbw_channels; ch++) 228 block->channel_in_cpl[ch] = 0; 229 } 230 231 block->new_cpl_strategy = !blk; 232 if (blk) { 233 for (ch = 1; ch <= s->fbw_channels; ch++) { 234 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { 235 block->new_cpl_strategy = 1; 236 break; 237 } 238 } 239 } 240 block->new_cpl_leak = block->new_cpl_strategy; 241 242 if (!blk || (block->cpl_in_use && !got_cpl_snr)) { 243 block->new_snr_offsets = 1; 244 if (block->cpl_in_use) 245 got_cpl_snr = 1; 246 } else { 247 block->new_snr_offsets = 0; 248 } 249 } 250 if (!num_cpl_blocks) 251 s->cpl_on = 0; 252 253 /* set bandwidth for each channel */ 254 for (blk = 0; blk < s->num_blocks; blk++) { 255 AC3Block *block = &s->blocks[blk]; 256 for (ch = 1; ch <= s->fbw_channels; ch++) { 257 if (block->channel_in_cpl[ch]) 258 block->end_freq[ch] = s->start_freq[CPL_CH]; 259 else 260 block->end_freq[ch] = s->bandwidth_code * 3 + 73; 261 } 262 } 263} 264 265 266/** 267 * Apply stereo rematrixing to coefficients based on rematrixing flags. 268 * 269 * @param s AC-3 encoder private context 270 */ 271void ff_ac3_apply_rematrixing(AC3EncodeContext *s) 272{ 273 int nb_coefs; 274 int blk, bnd, i; 275 int start, end; 276 uint8_t *flags; 277 278 if (!s->rematrixing_enabled) 279 return; 280 281 for (blk = 0; blk < s->num_blocks; blk++) { 282 AC3Block *block = &s->blocks[blk]; 283 if (block->new_rematrixing_strategy) 284 flags = block->rematrixing_flags; 285 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); 286 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { 287 if (flags[bnd]) { 288 start = ff_ac3_rematrix_band_tab[bnd]; 289 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); 290 for (i = start; i < end; i++) { 291 int32_t lt = block->fixed_coef[1][i]; 292 int32_t rt = block->fixed_coef[2][i]; 293 block->fixed_coef[1][i] = (lt + rt) >> 1; 294 block->fixed_coef[2][i] = (lt - rt) >> 1; 295 } 296 } 297 } 298 } 299} 300 301 302/* 303 * Initialize exponent tables. 304 */ 305static av_cold void exponent_init(AC3EncodeContext *s) 306{ 307 int expstr, i, grpsize; 308 309 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) { 310 grpsize = 3 << expstr; 311 for (i = 12; i < 256; i++) { 312 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize; 313 exponent_group_tab[1][expstr][i] = (i ) / grpsize; 314 } 315 } 316 /* LFE */ 317 exponent_group_tab[0][0][7] = 2; 318 319 if (CONFIG_EAC3_ENCODER && s->eac3) 320 ff_eac3_exponent_init(); 321} 322 323 324/* 325 * Extract exponents from the MDCT coefficients. 326 */ 327static void extract_exponents(AC3EncodeContext *s) 328{ 329 int ch = !s->cpl_on; 330 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1); 331 AC3Block *block = &s->blocks[0]; 332 333 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size); 334} 335 336 337/** 338 * Exponent Difference Threshold. 339 * New exponents are sent if their SAD exceed this number. 340 */ 341#define EXP_DIFF_THRESHOLD 500 342 343/** 344 * Table used to select exponent strategy based on exponent reuse block interval. 345 */ 346static const uint8_t exp_strategy_reuse_tab[4][6] = { 347 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, 348 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, 349 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, 350 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 } 351}; 352 353/* 354 * Calculate exponent strategies for all channels. 355 * Array arrangement is reversed to simplify the per-channel calculation. 356 */ 357static void compute_exp_strategy(AC3EncodeContext *s) 358{ 359 int ch, blk, blk1; 360 361 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { 362 uint8_t *exp_strategy = s->exp_strategy[ch]; 363 uint8_t *exp = s->blocks[0].exp[ch]; 364 int exp_diff; 365 366 /* estimate if the exponent variation & decide if they should be 367 reused in the next frame */ 368 exp_strategy[0] = EXP_NEW; 369 exp += AC3_MAX_COEFS; 370 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) { 371 if (ch == CPL_CH) { 372 if (!s->blocks[blk-1].cpl_in_use) { 373 exp_strategy[blk] = EXP_NEW; 374 continue; 375 } else if (!s->blocks[blk].cpl_in_use) { 376 exp_strategy[blk] = EXP_REUSE; 377 continue; 378 } 379 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { 380 exp_strategy[blk] = EXP_NEW; 381 continue; 382 } 383 exp_diff = s->dsp.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16); 384 exp_strategy[blk] = EXP_REUSE; 385 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS)) 386 exp_strategy[blk] = EXP_NEW; 387 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD) 388 exp_strategy[blk] = EXP_NEW; 389 } 390 391 /* now select the encoding strategy type : if exponents are often 392 recoded, we use a coarse encoding */ 393 blk = 0; 394 while (blk < s->num_blocks) { 395 blk1 = blk + 1; 396 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) 397 blk1++; 398 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1]; 399 blk = blk1; 400 } 401 } 402 if (s->lfe_on) { 403 ch = s->lfe_channel; 404 s->exp_strategy[ch][0] = EXP_D15; 405 for (blk = 1; blk < s->num_blocks; blk++) 406 s->exp_strategy[ch][blk] = EXP_REUSE; 407 } 408 409 /* for E-AC-3, determine frame exponent strategy */ 410 if (CONFIG_EAC3_ENCODER && s->eac3) 411 ff_eac3_get_frame_exp_strategy(s); 412} 413 414 415/** 416 * Update the exponents so that they are the ones the decoder will decode. 417 * 418 * @param[in,out] exp array of exponents for 1 block in 1 channel 419 * @param nb_exps number of exponents in active bandwidth 420 * @param exp_strategy exponent strategy for the block 421 * @param cpl indicates if the block is in the coupling channel 422 */ 423static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy, 424 int cpl) 425{ 426 int nb_groups, i, k; 427 428 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3; 429 430 /* for each group, compute the minimum exponent */ 431 switch(exp_strategy) { 432 case EXP_D25: 433 for (i = 1, k = 1-cpl; i <= nb_groups; i++) { 434 uint8_t exp_min = exp[k]; 435 if (exp[k+1] < exp_min) 436 exp_min = exp[k+1]; 437 exp[i-cpl] = exp_min; 438 k += 2; 439 } 440 break; 441 case EXP_D45: 442 for (i = 1, k = 1-cpl; i <= nb_groups; i++) { 443 uint8_t exp_min = exp[k]; 444 if (exp[k+1] < exp_min) 445 exp_min = exp[k+1]; 446 if (exp[k+2] < exp_min) 447 exp_min = exp[k+2]; 448 if (exp[k+3] < exp_min) 449 exp_min = exp[k+3]; 450 exp[i-cpl] = exp_min; 451 k += 4; 452 } 453 break; 454 } 455 456 /* constraint for DC exponent */ 457 if (!cpl && exp[0] > 15) 458 exp[0] = 15; 459 460 /* decrease the delta between each groups to within 2 so that they can be 461 differentially encoded */ 462 for (i = 1; i <= nb_groups; i++) 463 exp[i] = FFMIN(exp[i], exp[i-1] + 2); 464 i--; 465 while (--i >= 0) 466 exp[i] = FFMIN(exp[i], exp[i+1] + 2); 467 468 if (cpl) 469 exp[-1] = exp[0] & ~1; 470 471 /* now we have the exponent values the decoder will see */ 472 switch (exp_strategy) { 473 case EXP_D25: 474 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) { 475 uint8_t exp1 = exp[i-cpl]; 476 exp[k--] = exp1; 477 exp[k--] = exp1; 478 } 479 break; 480 case EXP_D45: 481 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) { 482 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl]; 483 k -= 4; 484 } 485 break; 486 } 487} 488 489 490/* 491 * Encode exponents from original extracted form to what the decoder will see. 492 * This copies and groups exponents based on exponent strategy and reduces 493 * deltas between adjacent exponent groups so that they can be differentially 494 * encoded. 495 */ 496static void encode_exponents(AC3EncodeContext *s) 497{ 498 int blk, blk1, ch, cpl; 499 uint8_t *exp, *exp_strategy; 500 int nb_coefs, num_reuse_blocks; 501 502 for (ch = !s->cpl_on; ch <= s->channels; ch++) { 503 exp = s->blocks[0].exp[ch] + s->start_freq[ch]; 504 exp_strategy = s->exp_strategy[ch]; 505 506 cpl = (ch == CPL_CH); 507 blk = 0; 508 while (blk < s->num_blocks) { 509 AC3Block *block = &s->blocks[blk]; 510 if (cpl && !block->cpl_in_use) { 511 exp += AC3_MAX_COEFS; 512 blk++; 513 continue; 514 } 515 nb_coefs = block->end_freq[ch] - s->start_freq[ch]; 516 blk1 = blk + 1; 517 518 /* count the number of EXP_REUSE blocks after the current block 519 and set exponent reference block numbers */ 520 s->exp_ref_block[ch][blk] = blk; 521 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) { 522 s->exp_ref_block[ch][blk1] = blk; 523 blk1++; 524 } 525 num_reuse_blocks = blk1 - blk - 1; 526 527 /* for the EXP_REUSE case we select the min of the exponents */ 528 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks, 529 AC3_MAX_COEFS); 530 531 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl); 532 533 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1); 534 blk = blk1; 535 } 536 } 537 538 /* reference block numbers have been changed, so reset ref_bap_set */ 539 s->ref_bap_set = 0; 540} 541 542 543/* 544 * Count exponent bits based on bandwidth, coupling, and exponent strategies. 545 */ 546static int count_exponent_bits(AC3EncodeContext *s) 547{ 548 int blk, ch; 549 int nb_groups, bit_count; 550 551 bit_count = 0; 552 for (blk = 0; blk < s->num_blocks; blk++) { 553 AC3Block *block = &s->blocks[blk]; 554 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 555 int exp_strategy = s->exp_strategy[ch][blk]; 556 int cpl = (ch == CPL_CH); 557 int nb_coefs = block->end_freq[ch] - s->start_freq[ch]; 558 559 if (exp_strategy == EXP_REUSE) 560 continue; 561 562 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs]; 563 bit_count += 4 + (nb_groups * 7); 564 } 565 } 566 567 return bit_count; 568} 569 570 571/** 572 * Group exponents. 573 * 3 delta-encoded exponents are in each 7-bit group. The number of groups 574 * varies depending on exponent strategy and bandwidth. 575 * 576 * @param s AC-3 encoder private context 577 */ 578void ff_ac3_group_exponents(AC3EncodeContext *s) 579{ 580 int blk, ch, i, cpl; 581 int group_size, nb_groups; 582 uint8_t *p; 583 int delta0, delta1, delta2; 584 int exp0, exp1; 585 586 for (blk = 0; blk < s->num_blocks; blk++) { 587 AC3Block *block = &s->blocks[blk]; 588 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 589 int exp_strategy = s->exp_strategy[ch][blk]; 590 if (exp_strategy == EXP_REUSE) 591 continue; 592 cpl = (ch == CPL_CH); 593 group_size = exp_strategy + (exp_strategy == EXP_D45); 594 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]]; 595 p = block->exp[ch] + s->start_freq[ch] - cpl; 596 597 /* DC exponent */ 598 exp1 = *p++; 599 block->grouped_exp[ch][0] = exp1; 600 601 /* remaining exponents are delta encoded */ 602 for (i = 1; i <= nb_groups; i++) { 603 /* merge three delta in one code */ 604 exp0 = exp1; 605 exp1 = p[0]; 606 p += group_size; 607 delta0 = exp1 - exp0 + 2; 608 av_assert2(delta0 >= 0 && delta0 <= 4); 609 610 exp0 = exp1; 611 exp1 = p[0]; 612 p += group_size; 613 delta1 = exp1 - exp0 + 2; 614 av_assert2(delta1 >= 0 && delta1 <= 4); 615 616 exp0 = exp1; 617 exp1 = p[0]; 618 p += group_size; 619 delta2 = exp1 - exp0 + 2; 620 av_assert2(delta2 >= 0 && delta2 <= 4); 621 622 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2; 623 } 624 } 625 } 626} 627 628 629/** 630 * Calculate final exponents from the supplied MDCT coefficients and exponent shift. 631 * Extract exponents from MDCT coefficients, calculate exponent strategies, 632 * and encode final exponents. 633 * 634 * @param s AC-3 encoder private context 635 */ 636void ff_ac3_process_exponents(AC3EncodeContext *s) 637{ 638 extract_exponents(s); 639 640 compute_exp_strategy(s); 641 642 encode_exponents(s); 643 644 emms_c(); 645} 646 647 648/* 649 * Count frame bits that are based solely on fixed parameters. 650 * This only has to be run once when the encoder is initialized. 651 */ 652static void count_frame_bits_fixed(AC3EncodeContext *s) 653{ 654 static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 }; 655 int blk; 656 int frame_bits; 657 658 /* assumptions: 659 * no dynamic range codes 660 * bit allocation parameters do not change between blocks 661 * no delta bit allocation 662 * no skipped data 663 * no auxilliary data 664 * no E-AC-3 metadata 665 */ 666 667 /* header */ 668 frame_bits = 16; /* sync info */ 669 if (s->eac3) { 670 /* bitstream info header */ 671 frame_bits += 35; 672 frame_bits += 1 + 1; 673 if (s->num_blocks != 0x6) 674 frame_bits++; 675 frame_bits++; 676 /* audio frame header */ 677 if (s->num_blocks == 6) 678 frame_bits += 2; 679 frame_bits += 10; 680 /* exponent strategy */ 681 if (s->use_frame_exp_strategy) 682 frame_bits += 5 * s->fbw_channels; 683 else 684 frame_bits += s->num_blocks * 2 * s->fbw_channels; 685 if (s->lfe_on) 686 frame_bits += s->num_blocks; 687 /* converter exponent strategy */ 688 if (s->num_blks_code != 0x3) 689 frame_bits++; 690 else 691 frame_bits += s->fbw_channels * 5; 692 /* snr offsets */ 693 frame_bits += 10; 694 /* block start info */ 695 if (s->num_blocks != 1) 696 frame_bits++; 697 } else { 698 frame_bits += 49; 699 frame_bits += frame_bits_inc[s->channel_mode]; 700 } 701 702 /* audio blocks */ 703 for (blk = 0; blk < s->num_blocks; blk++) { 704 if (!s->eac3) { 705 /* block switch flags */ 706 frame_bits += s->fbw_channels; 707 708 /* dither flags */ 709 frame_bits += s->fbw_channels; 710 } 711 712 /* dynamic range */ 713 frame_bits++; 714 715 /* spectral extension */ 716 if (s->eac3) 717 frame_bits++; 718 719 if (!s->eac3) { 720 /* exponent strategy */ 721 frame_bits += 2 * s->fbw_channels; 722 if (s->lfe_on) 723 frame_bits++; 724 725 /* bit allocation params */ 726 frame_bits++; 727 if (!blk) 728 frame_bits += 2 + 2 + 2 + 2 + 3; 729 } 730 731 /* converter snr offset */ 732 if (s->eac3) 733 frame_bits++; 734 735 if (!s->eac3) { 736 /* delta bit allocation */ 737 frame_bits++; 738 739 /* skipped data */ 740 frame_bits++; 741 } 742 } 743 744 /* auxiliary data */ 745 frame_bits++; 746 747 /* CRC */ 748 frame_bits += 1 + 16; 749 750 s->frame_bits_fixed = frame_bits; 751} 752 753 754/* 755 * Initialize bit allocation. 756 * Set default parameter codes and calculate parameter values. 757 */ 758static void bit_alloc_init(AC3EncodeContext *s) 759{ 760 int ch; 761 762 /* init default parameters */ 763 s->slow_decay_code = 2; 764 s->fast_decay_code = 1; 765 s->slow_gain_code = 1; 766 s->db_per_bit_code = s->eac3 ? 2 : 3; 767 s->floor_code = 7; 768 for (ch = 0; ch <= s->channels; ch++) 769 s->fast_gain_code[ch] = 4; 770 771 /* initial snr offset */ 772 s->coarse_snr_offset = 40; 773 774 /* compute real values */ 775 /* currently none of these values change during encoding, so we can just 776 set them once at initialization */ 777 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift; 778 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift; 779 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code]; 780 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code]; 781 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code]; 782 s->bit_alloc.cpl_fast_leak = 0; 783 s->bit_alloc.cpl_slow_leak = 0; 784 785 count_frame_bits_fixed(s); 786} 787 788 789/* 790 * Count the bits used to encode the frame, minus exponents and mantissas. 791 * Bits based on fixed parameters have already been counted, so now we just 792 * have to add the bits based on parameters that change during encoding. 793 */ 794static void count_frame_bits(AC3EncodeContext *s) 795{ 796 AC3EncOptions *opt = &s->options; 797 int blk, ch; 798 int frame_bits = 0; 799 800 /* header */ 801 if (s->eac3) { 802 if (opt->eac3_mixing_metadata) { 803 if (s->channel_mode > AC3_CHMODE_STEREO) 804 frame_bits += 2; 805 if (s->has_center) 806 frame_bits += 6; 807 if (s->has_surround) 808 frame_bits += 6; 809 frame_bits += s->lfe_on; 810 frame_bits += 1 + 1 + 2; 811 if (s->channel_mode < AC3_CHMODE_STEREO) 812 frame_bits++; 813 frame_bits++; 814 } 815 if (opt->eac3_info_metadata) { 816 frame_bits += 3 + 1 + 1; 817 if (s->channel_mode == AC3_CHMODE_STEREO) 818 frame_bits += 2 + 2; 819 if (s->channel_mode >= AC3_CHMODE_2F2R) 820 frame_bits += 2; 821 frame_bits++; 822 if (opt->audio_production_info) 823 frame_bits += 5 + 2 + 1; 824 frame_bits++; 825 } 826 /* coupling */ 827 if (s->channel_mode > AC3_CHMODE_MONO) { 828 frame_bits++; 829 for (blk = 1; blk < s->num_blocks; blk++) { 830 AC3Block *block = &s->blocks[blk]; 831 frame_bits++; 832 if (block->new_cpl_strategy) 833 frame_bits++; 834 } 835 } 836 /* coupling exponent strategy */ 837 if (s->cpl_on) { 838 if (s->use_frame_exp_strategy) { 839 frame_bits += 5 * s->cpl_on; 840 } else { 841 for (blk = 0; blk < s->num_blocks; blk++) 842 frame_bits += 2 * s->blocks[blk].cpl_in_use; 843 } 844 } 845 } else { 846 if (opt->audio_production_info) 847 frame_bits += 7; 848 if (s->bitstream_id == 6) { 849 if (opt->extended_bsi_1) 850 frame_bits += 14; 851 if (opt->extended_bsi_2) 852 frame_bits += 14; 853 } 854 } 855 856 /* audio blocks */ 857 for (blk = 0; blk < s->num_blocks; blk++) { 858 AC3Block *block = &s->blocks[blk]; 859 860 /* coupling strategy */ 861 if (!s->eac3) 862 frame_bits++; 863 if (block->new_cpl_strategy) { 864 if (!s->eac3) 865 frame_bits++; 866 if (block->cpl_in_use) { 867 if (s->eac3) 868 frame_bits++; 869 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) 870 frame_bits += s->fbw_channels; 871 if (s->channel_mode == AC3_CHMODE_STEREO) 872 frame_bits++; 873 frame_bits += 4 + 4; 874 if (s->eac3) 875 frame_bits++; 876 else 877 frame_bits += s->num_cpl_subbands - 1; 878 } 879 } 880 881 /* coupling coordinates */ 882 if (block->cpl_in_use) { 883 for (ch = 1; ch <= s->fbw_channels; ch++) { 884 if (block->channel_in_cpl[ch]) { 885 if (!s->eac3 || block->new_cpl_coords[ch] != 2) 886 frame_bits++; 887 if (block->new_cpl_coords[ch]) { 888 frame_bits += 2; 889 frame_bits += (4 + 4) * s->num_cpl_bands; 890 } 891 } 892 } 893 } 894 895 /* stereo rematrixing */ 896 if (s->channel_mode == AC3_CHMODE_STEREO) { 897 if (!s->eac3 || blk > 0) 898 frame_bits++; 899 if (s->blocks[blk].new_rematrixing_strategy) 900 frame_bits += block->num_rematrixing_bands; 901 } 902 903 /* bandwidth codes & gain range */ 904 for (ch = 1; ch <= s->fbw_channels; ch++) { 905 if (s->exp_strategy[ch][blk] != EXP_REUSE) { 906 if (!block->channel_in_cpl[ch]) 907 frame_bits += 6; 908 frame_bits += 2; 909 } 910 } 911 912 /* coupling exponent strategy */ 913 if (!s->eac3 && block->cpl_in_use) 914 frame_bits += 2; 915 916 /* snr offsets and fast gain codes */ 917 if (!s->eac3) { 918 frame_bits++; 919 if (block->new_snr_offsets) 920 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3); 921 } 922 923 /* coupling leak info */ 924 if (block->cpl_in_use) { 925 if (!s->eac3 || block->new_cpl_leak != 2) 926 frame_bits++; 927 if (block->new_cpl_leak) 928 frame_bits += 3 + 3; 929 } 930 } 931 932 s->frame_bits = s->frame_bits_fixed + frame_bits; 933} 934 935 936/* 937 * Calculate masking curve based on the final exponents. 938 * Also calculate the power spectral densities to use in future calculations. 939 */ 940static void bit_alloc_masking(AC3EncodeContext *s) 941{ 942 int blk, ch; 943 944 for (blk = 0; blk < s->num_blocks; blk++) { 945 AC3Block *block = &s->blocks[blk]; 946 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 947 /* We only need psd and mask for calculating bap. 948 Since we currently do not calculate bap when exponent 949 strategy is EXP_REUSE we do not need to calculate psd or mask. */ 950 if (s->exp_strategy[ch][blk] != EXP_REUSE) { 951 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch], 952 block->end_freq[ch], block->psd[ch], 953 block->band_psd[ch]); 954 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch], 955 s->start_freq[ch], block->end_freq[ch], 956 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]], 957 ch == s->lfe_channel, 958 DBA_NONE, 0, NULL, NULL, NULL, 959 block->mask[ch]); 960 } 961 } 962 } 963} 964 965 966/* 967 * Ensure that bap for each block and channel point to the current bap_buffer. 968 * They may have been switched during the bit allocation search. 969 */ 970static void reset_block_bap(AC3EncodeContext *s) 971{ 972 int blk, ch; 973 uint8_t *ref_bap; 974 975 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set) 976 return; 977 978 ref_bap = s->bap_buffer; 979 for (ch = 0; ch <= s->channels; ch++) { 980 for (blk = 0; blk < s->num_blocks; blk++) 981 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk]; 982 ref_bap += AC3_MAX_COEFS * s->num_blocks; 983 } 984 s->ref_bap_set = 1; 985} 986 987 988/** 989 * Initialize mantissa counts. 990 * These are set so that they are padded to the next whole group size when bits 991 * are counted in compute_mantissa_size. 992 * 993 * @param[in,out] mant_cnt running counts for each bap value for each block 994 */ 995static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16]) 996{ 997 int blk; 998 999 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { 1000 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk])); 1001 mant_cnt[blk][1] = mant_cnt[blk][2] = 2; 1002 mant_cnt[blk][4] = 1; 1003 } 1004} 1005 1006 1007/** 1008 * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth 1009 * range. 1010 * 1011 * @param s AC-3 encoder private context 1012 * @param ch channel index 1013 * @param[in,out] mant_cnt running counts for each bap value for each block 1014 * @param start starting coefficient bin 1015 * @param end ending coefficient bin 1016 */ 1017static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch, 1018 uint16_t mant_cnt[AC3_MAX_BLOCKS][16], 1019 int start, int end) 1020{ 1021 int blk; 1022 1023 for (blk = 0; blk < s->num_blocks; blk++) { 1024 AC3Block *block = &s->blocks[blk]; 1025 if (ch == CPL_CH && !block->cpl_in_use) 1026 continue; 1027 s->ac3dsp.update_bap_counts(mant_cnt[blk], 1028 s->ref_bap[ch][blk] + start, 1029 FFMIN(end, block->end_freq[ch]) - start); 1030 } 1031} 1032 1033 1034/* 1035 * Count the number of mantissa bits in the frame based on the bap values. 1036 */ 1037static int count_mantissa_bits(AC3EncodeContext *s) 1038{ 1039 int ch, max_end_freq; 1040 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]); 1041 1042 count_mantissa_bits_init(mant_cnt); 1043 1044 max_end_freq = s->bandwidth_code * 3 + 73; 1045 for (ch = !s->cpl_enabled; ch <= s->channels; ch++) 1046 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch], 1047 max_end_freq); 1048 1049 return s->ac3dsp.compute_mantissa_size(mant_cnt); 1050} 1051 1052 1053/** 1054 * Run the bit allocation with a given SNR offset. 1055 * This calculates the bit allocation pointers that will be used to determine 1056 * the quantization of each mantissa. 1057 * 1058 * @param s AC-3 encoder private context 1059 * @param snr_offset SNR offset, 0 to 1023 1060 * @return the number of bits needed for mantissas if the given SNR offset is 1061 * is used. 1062 */ 1063static int bit_alloc(AC3EncodeContext *s, int snr_offset) 1064{ 1065 int blk, ch; 1066 1067 snr_offset = (snr_offset - 240) << 2; 1068 1069 reset_block_bap(s); 1070 for (blk = 0; blk < s->num_blocks; blk++) { 1071 AC3Block *block = &s->blocks[blk]; 1072 1073 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 1074 /* Currently the only bit allocation parameters which vary across 1075 blocks within a frame are the exponent values. We can take 1076 advantage of that by reusing the bit allocation pointers 1077 whenever we reuse exponents. */ 1078 if (s->exp_strategy[ch][blk] != EXP_REUSE) { 1079 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch], 1080 s->start_freq[ch], block->end_freq[ch], 1081 snr_offset, s->bit_alloc.floor, 1082 ff_ac3_bap_tab, s->ref_bap[ch][blk]); 1083 } 1084 } 1085 } 1086 return count_mantissa_bits(s); 1087} 1088 1089 1090/* 1091 * Constant bitrate bit allocation search. 1092 * Find the largest SNR offset that will allow data to fit in the frame. 1093 */ 1094static int cbr_bit_allocation(AC3EncodeContext *s) 1095{ 1096 int ch; 1097 int bits_left; 1098 int snr_offset, snr_incr; 1099 1100 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits); 1101 if (bits_left < 0) 1102 return AVERROR(EINVAL); 1103 1104 snr_offset = s->coarse_snr_offset << 4; 1105 1106 /* if previous frame SNR offset was 1023, check if current frame can also 1107 use SNR offset of 1023. if so, skip the search. */ 1108 if ((snr_offset | s->fine_snr_offset[1]) == 1023) { 1109 if (bit_alloc(s, 1023) <= bits_left) 1110 return 0; 1111 } 1112 1113 while (snr_offset >= 0 && 1114 bit_alloc(s, snr_offset) > bits_left) { 1115 snr_offset -= 64; 1116 } 1117 if (snr_offset < 0) 1118 return AVERROR(EINVAL); 1119 1120 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); 1121 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) { 1122 while (snr_offset + snr_incr <= 1023 && 1123 bit_alloc(s, snr_offset + snr_incr) <= bits_left) { 1124 snr_offset += snr_incr; 1125 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); 1126 } 1127 } 1128 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); 1129 reset_block_bap(s); 1130 1131 s->coarse_snr_offset = snr_offset >> 4; 1132 for (ch = !s->cpl_on; ch <= s->channels; ch++) 1133 s->fine_snr_offset[ch] = snr_offset & 0xF; 1134 1135 return 0; 1136} 1137 1138 1139/* 1140 * Perform bit allocation search. 1141 * Finds the SNR offset value that maximizes quality and fits in the specified 1142 * frame size. Output is the SNR offset and a set of bit allocation pointers 1143 * used to quantize the mantissas. 1144 */ 1145int ff_ac3_compute_bit_allocation(AC3EncodeContext *s) 1146{ 1147 count_frame_bits(s); 1148 1149 s->exponent_bits = count_exponent_bits(s); 1150 1151 bit_alloc_masking(s); 1152 1153 return cbr_bit_allocation(s); 1154} 1155 1156 1157/** 1158 * Symmetric quantization on 'levels' levels. 1159 * 1160 * @param c unquantized coefficient 1161 * @param e exponent 1162 * @param levels number of quantization levels 1163 * @return quantized coefficient 1164 */ 1165static inline int sym_quant(int c, int e, int levels) 1166{ 1167 int v = (((levels * c) >> (24 - e)) + levels) >> 1; 1168 av_assert2(v >= 0 && v < levels); 1169 return v; 1170} 1171 1172 1173/** 1174 * Asymmetric quantization on 2^qbits levels. 1175 * 1176 * @param c unquantized coefficient 1177 * @param e exponent 1178 * @param qbits number of quantization bits 1179 * @return quantized coefficient 1180 */ 1181static inline int asym_quant(int c, int e, int qbits) 1182{ 1183 int m; 1184 1185 c = (((c << e) >> (24 - qbits)) + 1) >> 1; 1186 m = (1 << (qbits-1)); 1187 if (c >= m) 1188 c = m - 1; 1189 av_assert2(c >= -m); 1190 return c; 1191} 1192 1193 1194/** 1195 * Quantize a set of mantissas for a single channel in a single block. 1196 * 1197 * @param s Mantissa count context 1198 * @param fixed_coef unquantized fixed-point coefficients 1199 * @param exp exponents 1200 * @param bap bit allocation pointer indices 1201 * @param[out] qmant quantized coefficients 1202 * @param start_freq starting coefficient bin 1203 * @param end_freq ending coefficient bin 1204 */ 1205static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef, 1206 uint8_t *exp, uint8_t *bap, 1207 int16_t *qmant, int start_freq, 1208 int end_freq) 1209{ 1210 int i; 1211 1212 for (i = start_freq; i < end_freq; i++) { 1213 int v; 1214 int c = fixed_coef[i]; 1215 int e = exp[i]; 1216 int b = bap[i]; 1217 switch (b) { 1218 case 0: 1219 v = 0; 1220 break; 1221 case 1: 1222 v = sym_quant(c, e, 3); 1223 switch (s->mant1_cnt) { 1224 case 0: 1225 s->qmant1_ptr = &qmant[i]; 1226 v = 9 * v; 1227 s->mant1_cnt = 1; 1228 break; 1229 case 1: 1230 *s->qmant1_ptr += 3 * v; 1231 s->mant1_cnt = 2; 1232 v = 128; 1233 break; 1234 default: 1235 *s->qmant1_ptr += v; 1236 s->mant1_cnt = 0; 1237 v = 128; 1238 break; 1239 } 1240 break; 1241 case 2: 1242 v = sym_quant(c, e, 5); 1243 switch (s->mant2_cnt) { 1244 case 0: 1245 s->qmant2_ptr = &qmant[i]; 1246 v = 25 * v; 1247 s->mant2_cnt = 1; 1248 break; 1249 case 1: 1250 *s->qmant2_ptr += 5 * v; 1251 s->mant2_cnt = 2; 1252 v = 128; 1253 break; 1254 default: 1255 *s->qmant2_ptr += v; 1256 s->mant2_cnt = 0; 1257 v = 128; 1258 break; 1259 } 1260 break; 1261 case 3: 1262 v = sym_quant(c, e, 7); 1263 break; 1264 case 4: 1265 v = sym_quant(c, e, 11); 1266 switch (s->mant4_cnt) { 1267 case 0: 1268 s->qmant4_ptr = &qmant[i]; 1269 v = 11 * v; 1270 s->mant4_cnt = 1; 1271 break; 1272 default: 1273 *s->qmant4_ptr += v; 1274 s->mant4_cnt = 0; 1275 v = 128; 1276 break; 1277 } 1278 break; 1279 case 5: 1280 v = sym_quant(c, e, 15); 1281 break; 1282 case 14: 1283 v = asym_quant(c, e, 14); 1284 break; 1285 case 15: 1286 v = asym_quant(c, e, 16); 1287 break; 1288 default: 1289 v = asym_quant(c, e, b - 1); 1290 break; 1291 } 1292 qmant[i] = v; 1293 } 1294} 1295 1296 1297/** 1298 * Quantize mantissas using coefficients, exponents, and bit allocation pointers. 1299 * 1300 * @param s AC-3 encoder private context 1301 */ 1302void ff_ac3_quantize_mantissas(AC3EncodeContext *s) 1303{ 1304 int blk, ch, ch0=0, got_cpl; 1305 1306 for (blk = 0; blk < s->num_blocks; blk++) { 1307 AC3Block *block = &s->blocks[blk]; 1308 AC3Mant m = { 0 }; 1309 1310 got_cpl = !block->cpl_in_use; 1311 for (ch = 1; ch <= s->channels; ch++) { 1312 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { 1313 ch0 = ch - 1; 1314 ch = CPL_CH; 1315 got_cpl = 1; 1316 } 1317 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch], 1318 s->blocks[s->exp_ref_block[ch][blk]].exp[ch], 1319 s->ref_bap[ch][blk], block->qmant[ch], 1320 s->start_freq[ch], block->end_freq[ch]); 1321 if (ch == CPL_CH) 1322 ch = ch0; 1323 } 1324 } 1325} 1326 1327 1328/* 1329 * Write the AC-3 frame header to the output bitstream. 1330 */ 1331static void ac3_output_frame_header(AC3EncodeContext *s) 1332{ 1333 AC3EncOptions *opt = &s->options; 1334 1335 put_bits(&s->pb, 16, 0x0b77); /* frame header */ 1336 put_bits(&s->pb, 16, 0); /* crc1: will be filled later */ 1337 put_bits(&s->pb, 2, s->bit_alloc.sr_code); 1338 put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2); 1339 put_bits(&s->pb, 5, s->bitstream_id); 1340 put_bits(&s->pb, 3, s->bitstream_mode); 1341 put_bits(&s->pb, 3, s->channel_mode); 1342 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO) 1343 put_bits(&s->pb, 2, s->center_mix_level); 1344 if (s->channel_mode & 0x04) 1345 put_bits(&s->pb, 2, s->surround_mix_level); 1346 if (s->channel_mode == AC3_CHMODE_STEREO) 1347 put_bits(&s->pb, 2, opt->dolby_surround_mode); 1348 put_bits(&s->pb, 1, s->lfe_on); /* LFE */ 1349 put_bits(&s->pb, 5, -opt->dialogue_level); 1350 put_bits(&s->pb, 1, 0); /* no compression control word */ 1351 put_bits(&s->pb, 1, 0); /* no lang code */ 1352 put_bits(&s->pb, 1, opt->audio_production_info); 1353 if (opt->audio_production_info) { 1354 put_bits(&s->pb, 5, opt->mixing_level - 80); 1355 put_bits(&s->pb, 2, opt->room_type); 1356 } 1357 put_bits(&s->pb, 1, opt->copyright); 1358 put_bits(&s->pb, 1, opt->original); 1359 if (s->bitstream_id == 6) { 1360 /* alternate bit stream syntax */ 1361 put_bits(&s->pb, 1, opt->extended_bsi_1); 1362 if (opt->extended_bsi_1) { 1363 put_bits(&s->pb, 2, opt->preferred_stereo_downmix); 1364 put_bits(&s->pb, 3, s->ltrt_center_mix_level); 1365 put_bits(&s->pb, 3, s->ltrt_surround_mix_level); 1366 put_bits(&s->pb, 3, s->loro_center_mix_level); 1367 put_bits(&s->pb, 3, s->loro_surround_mix_level); 1368 } 1369 put_bits(&s->pb, 1, opt->extended_bsi_2); 1370 if (opt->extended_bsi_2) { 1371 put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); 1372 put_bits(&s->pb, 2, opt->dolby_headphone_mode); 1373 put_bits(&s->pb, 1, opt->ad_converter_type); 1374 put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */ 1375 } 1376 } else { 1377 put_bits(&s->pb, 1, 0); /* no time code 1 */ 1378 put_bits(&s->pb, 1, 0); /* no time code 2 */ 1379 } 1380 put_bits(&s->pb, 1, 0); /* no additional bit stream info */ 1381} 1382 1383 1384/* 1385 * Write one audio block to the output bitstream. 1386 */ 1387static void output_audio_block(AC3EncodeContext *s, int blk) 1388{ 1389 int ch, i, baie, bnd, got_cpl; 1390 int av_uninit(ch0); 1391 AC3Block *block = &s->blocks[blk]; 1392 1393 /* block switching */ 1394 if (!s->eac3) { 1395 for (ch = 0; ch < s->fbw_channels; ch++) 1396 put_bits(&s->pb, 1, 0); 1397 } 1398 1399 /* dither flags */ 1400 if (!s->eac3) { 1401 for (ch = 0; ch < s->fbw_channels; ch++) 1402 put_bits(&s->pb, 1, 1); 1403 } 1404 1405 /* dynamic range codes */ 1406 put_bits(&s->pb, 1, 0); 1407 1408 /* spectral extension */ 1409 if (s->eac3) 1410 put_bits(&s->pb, 1, 0); 1411 1412 /* channel coupling */ 1413 if (!s->eac3) 1414 put_bits(&s->pb, 1, block->new_cpl_strategy); 1415 if (block->new_cpl_strategy) { 1416 if (!s->eac3) 1417 put_bits(&s->pb, 1, block->cpl_in_use); 1418 if (block->cpl_in_use) { 1419 int start_sub, end_sub; 1420 if (s->eac3) 1421 put_bits(&s->pb, 1, 0); /* enhanced coupling */ 1422 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) { 1423 for (ch = 1; ch <= s->fbw_channels; ch++) 1424 put_bits(&s->pb, 1, block->channel_in_cpl[ch]); 1425 } 1426 if (s->channel_mode == AC3_CHMODE_STEREO) 1427 put_bits(&s->pb, 1, 0); /* phase flags in use */ 1428 start_sub = (s->start_freq[CPL_CH] - 37) / 12; 1429 end_sub = (s->cpl_end_freq - 37) / 12; 1430 put_bits(&s->pb, 4, start_sub); 1431 put_bits(&s->pb, 4, end_sub - 3); 1432 /* coupling band structure */ 1433 if (s->eac3) { 1434 put_bits(&s->pb, 1, 0); /* use default */ 1435 } else { 1436 for (bnd = start_sub+1; bnd < end_sub; bnd++) 1437 put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]); 1438 } 1439 } 1440 } 1441 1442 /* coupling coordinates */ 1443 if (block->cpl_in_use) { 1444 for (ch = 1; ch <= s->fbw_channels; ch++) { 1445 if (block->channel_in_cpl[ch]) { 1446 if (!s->eac3 || block->new_cpl_coords[ch] != 2) 1447 put_bits(&s->pb, 1, block->new_cpl_coords[ch]); 1448 if (block->new_cpl_coords[ch]) { 1449 put_bits(&s->pb, 2, block->cpl_master_exp[ch]); 1450 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { 1451 put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]); 1452 put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]); 1453 } 1454 } 1455 } 1456 } 1457 } 1458 1459 /* stereo rematrixing */ 1460 if (s->channel_mode == AC3_CHMODE_STEREO) { 1461 if (!s->eac3 || blk > 0) 1462 put_bits(&s->pb, 1, block->new_rematrixing_strategy); 1463 if (block->new_rematrixing_strategy) { 1464 /* rematrixing flags */ 1465 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) 1466 put_bits(&s->pb, 1, block->rematrixing_flags[bnd]); 1467 } 1468 } 1469 1470 /* exponent strategy */ 1471 if (!s->eac3) { 1472 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++) 1473 put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); 1474 if (s->lfe_on) 1475 put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); 1476 } 1477 1478 /* bandwidth */ 1479 for (ch = 1; ch <= s->fbw_channels; ch++) { 1480 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch]) 1481 put_bits(&s->pb, 6, s->bandwidth_code); 1482 } 1483 1484 /* exponents */ 1485 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 1486 int nb_groups; 1487 int cpl = (ch == CPL_CH); 1488 1489 if (s->exp_strategy[ch][blk] == EXP_REUSE) 1490 continue; 1491 1492 /* DC exponent */ 1493 put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl); 1494 1495 /* exponent groups */ 1496 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]]; 1497 for (i = 1; i <= nb_groups; i++) 1498 put_bits(&s->pb, 7, block->grouped_exp[ch][i]); 1499 1500 /* gain range info */ 1501 if (ch != s->lfe_channel && !cpl) 1502 put_bits(&s->pb, 2, 0); 1503 } 1504 1505 /* bit allocation info */ 1506 if (!s->eac3) { 1507 baie = (blk == 0); 1508 put_bits(&s->pb, 1, baie); 1509 if (baie) { 1510 put_bits(&s->pb, 2, s->slow_decay_code); 1511 put_bits(&s->pb, 2, s->fast_decay_code); 1512 put_bits(&s->pb, 2, s->slow_gain_code); 1513 put_bits(&s->pb, 2, s->db_per_bit_code); 1514 put_bits(&s->pb, 3, s->floor_code); 1515 } 1516 } 1517 1518 /* snr offset */ 1519 if (!s->eac3) { 1520 put_bits(&s->pb, 1, block->new_snr_offsets); 1521 if (block->new_snr_offsets) { 1522 put_bits(&s->pb, 6, s->coarse_snr_offset); 1523 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { 1524 put_bits(&s->pb, 4, s->fine_snr_offset[ch]); 1525 put_bits(&s->pb, 3, s->fast_gain_code[ch]); 1526 } 1527 } 1528 } else { 1529 put_bits(&s->pb, 1, 0); /* no converter snr offset */ 1530 } 1531 1532 /* coupling leak */ 1533 if (block->cpl_in_use) { 1534 if (!s->eac3 || block->new_cpl_leak != 2) 1535 put_bits(&s->pb, 1, block->new_cpl_leak); 1536 if (block->new_cpl_leak) { 1537 put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak); 1538 put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak); 1539 } 1540 } 1541 1542 if (!s->eac3) { 1543 put_bits(&s->pb, 1, 0); /* no delta bit allocation */ 1544 put_bits(&s->pb, 1, 0); /* no data to skip */ 1545 } 1546 1547 /* mantissas */ 1548 got_cpl = !block->cpl_in_use; 1549 for (ch = 1; ch <= s->channels; ch++) { 1550 int b, q; 1551 1552 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { 1553 ch0 = ch - 1; 1554 ch = CPL_CH; 1555 got_cpl = 1; 1556 } 1557 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) { 1558 q = block->qmant[ch][i]; 1559 b = s->ref_bap[ch][blk][i]; 1560 switch (b) { 1561 case 0: break; 1562 case 1: if (q != 128) put_bits (&s->pb, 5, q); break; 1563 case 2: if (q != 128) put_bits (&s->pb, 7, q); break; 1564 case 3: put_sbits(&s->pb, 3, q); break; 1565 case 4: if (q != 128) put_bits (&s->pb, 7, q); break; 1566 case 14: put_sbits(&s->pb, 14, q); break; 1567 case 15: put_sbits(&s->pb, 16, q); break; 1568 default: put_sbits(&s->pb, b-1, q); break; 1569 } 1570 } 1571 if (ch == CPL_CH) 1572 ch = ch0; 1573 } 1574} 1575 1576 1577/** CRC-16 Polynomial */ 1578#define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16)) 1579 1580 1581static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly) 1582{ 1583 unsigned int c; 1584 1585 c = 0; 1586 while (a) { 1587 if (a & 1) 1588 c ^= b; 1589 a = a >> 1; 1590 b = b << 1; 1591 if (b & (1 << 16)) 1592 b ^= poly; 1593 } 1594 return c; 1595} 1596 1597 1598static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly) 1599{ 1600 unsigned int r; 1601 r = 1; 1602 while (n) { 1603 if (n & 1) 1604 r = mul_poly(r, a, poly); 1605 a = mul_poly(a, a, poly); 1606 n >>= 1; 1607 } 1608 return r; 1609} 1610 1611 1612/* 1613 * Fill the end of the frame with 0's and compute the two CRCs. 1614 */ 1615static void output_frame_end(AC3EncodeContext *s) 1616{ 1617 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI); 1618 int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv; 1619 uint8_t *frame; 1620 1621 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1; 1622 1623 /* pad the remainder of the frame with zeros */ 1624 av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18); 1625 flush_put_bits(&s->pb); 1626 frame = s->pb.buf; 1627 pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2; 1628 av_assert2(pad_bytes >= 0); 1629 if (pad_bytes > 0) 1630 memset(put_bits_ptr(&s->pb), 0, pad_bytes); 1631 1632 if (s->eac3) { 1633 /* compute crc2 */ 1634 crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5); 1635 } else { 1636 /* compute crc1 */ 1637 /* this is not so easy because it is at the beginning of the data... */ 1638 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4)); 1639 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min]; 1640 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY); 1641 AV_WB16(frame + 2, crc1); 1642 1643 /* compute crc2 */ 1644 crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58, 1645 s->frame_size - frame_size_58 - 3); 1646 } 1647 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); 1648 /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */ 1649 if (crc2 == 0x770B) { 1650 frame[s->frame_size - 3] ^= 0x1; 1651 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); 1652 } 1653 crc2 = av_bswap16(crc2); 1654 AV_WB16(frame + s->frame_size - 2, crc2); 1655} 1656 1657 1658/** 1659 * Write the frame to the output bitstream. 1660 * 1661 * @param s AC-3 encoder private context 1662 * @param frame output data buffer 1663 */ 1664void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame) 1665{ 1666 int blk; 1667 1668 init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); 1669 1670 s->output_frame_header(s); 1671 1672 for (blk = 0; blk < s->num_blocks; blk++) 1673 output_audio_block(s, blk); 1674 1675 output_frame_end(s); 1676} 1677 1678 1679static void dprint_options(AC3EncodeContext *s) 1680{ 1681#ifdef DEBUG 1682 AVCodecContext *avctx = s->avctx; 1683 AC3EncOptions *opt = &s->options; 1684 char strbuf[32]; 1685 1686 switch (s->bitstream_id) { 1687 case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break; 1688 case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break; 1689 case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break; 1690 case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break; 1691 case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break; 1692 default: snprintf(strbuf, 32, "ERROR"); 1693 } 1694 av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id); 1695 av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt)); 1696 av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout); 1697 av_dlog(avctx, "channel_layout: %s\n", strbuf); 1698 av_dlog(avctx, "sample_rate: %d\n", s->sample_rate); 1699 av_dlog(avctx, "bit_rate: %d\n", s->bit_rate); 1700 av_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code); 1701 if (s->cutoff) 1702 av_dlog(avctx, "cutoff: %d\n", s->cutoff); 1703 1704 av_dlog(avctx, "per_frame_metadata: %s\n", 1705 opt->allow_per_frame_metadata?"on":"off"); 1706 if (s->has_center) 1707 av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level, 1708 s->center_mix_level); 1709 else 1710 av_dlog(avctx, "center_mixlev: {not written}\n"); 1711 if (s->has_surround) 1712 av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level, 1713 s->surround_mix_level); 1714 else 1715 av_dlog(avctx, "surround_mixlev: {not written}\n"); 1716 if (opt->audio_production_info) { 1717 av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level); 1718 switch (opt->room_type) { 1719 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1720 case AC3ENC_OPT_LARGE_ROOM: av_strlcpy(strbuf, "large", 32); break; 1721 case AC3ENC_OPT_SMALL_ROOM: av_strlcpy(strbuf, "small", 32); break; 1722 default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type); 1723 } 1724 av_dlog(avctx, "room_type: %s\n", strbuf); 1725 } else { 1726 av_dlog(avctx, "mixing_level: {not written}\n"); 1727 av_dlog(avctx, "room_type: {not written}\n"); 1728 } 1729 av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off"); 1730 av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level); 1731 if (s->channel_mode == AC3_CHMODE_STEREO) { 1732 switch (opt->dolby_surround_mode) { 1733 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1734 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; 1735 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; 1736 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode); 1737 } 1738 av_dlog(avctx, "dsur_mode: %s\n", strbuf); 1739 } else { 1740 av_dlog(avctx, "dsur_mode: {not written}\n"); 1741 } 1742 av_dlog(avctx, "original: %s\n", opt->original?"on":"off"); 1743 1744 if (s->bitstream_id == 6) { 1745 if (opt->extended_bsi_1) { 1746 switch (opt->preferred_stereo_downmix) { 1747 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1748 case AC3ENC_OPT_DOWNMIX_LTRT: av_strlcpy(strbuf, "ltrt", 32); break; 1749 case AC3ENC_OPT_DOWNMIX_LORO: av_strlcpy(strbuf, "loro", 32); break; 1750 default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix); 1751 } 1752 av_dlog(avctx, "dmix_mode: %s\n", strbuf); 1753 av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n", 1754 opt->ltrt_center_mix_level, s->ltrt_center_mix_level); 1755 av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n", 1756 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level); 1757 av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n", 1758 opt->loro_center_mix_level, s->loro_center_mix_level); 1759 av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n", 1760 opt->loro_surround_mix_level, s->loro_surround_mix_level); 1761 } else { 1762 av_dlog(avctx, "extended bitstream info 1: {not written}\n"); 1763 } 1764 if (opt->extended_bsi_2) { 1765 switch (opt->dolby_surround_ex_mode) { 1766 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1767 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; 1768 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; 1769 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode); 1770 } 1771 av_dlog(avctx, "dsurex_mode: %s\n", strbuf); 1772 switch (opt->dolby_headphone_mode) { 1773 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; 1774 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; 1775 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; 1776 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode); 1777 } 1778 av_dlog(avctx, "dheadphone_mode: %s\n", strbuf); 1779 1780 switch (opt->ad_converter_type) { 1781 case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break; 1782 case AC3ENC_OPT_ADCONV_HDCD: av_strlcpy(strbuf, "hdcd", 32); break; 1783 default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type); 1784 } 1785 av_dlog(avctx, "ad_conv_type: %s\n", strbuf); 1786 } else { 1787 av_dlog(avctx, "extended bitstream info 2: {not written}\n"); 1788 } 1789 } 1790#endif 1791} 1792 1793 1794#define FLT_OPTION_THRESHOLD 0.01 1795 1796static int validate_float_option(float v, const float *v_list, int v_list_size) 1797{ 1798 int i; 1799 1800 for (i = 0; i < v_list_size; i++) { 1801 if (v < (v_list[i] + FLT_OPTION_THRESHOLD) && 1802 v > (v_list[i] - FLT_OPTION_THRESHOLD)) 1803 break; 1804 } 1805 if (i == v_list_size) 1806 return -1; 1807 1808 return i; 1809} 1810 1811 1812static void validate_mix_level(void *log_ctx, const char *opt_name, 1813 float *opt_param, const float *list, 1814 int list_size, int default_value, int min_value, 1815 int *ctx_param) 1816{ 1817 int mixlev = validate_float_option(*opt_param, list, list_size); 1818 if (mixlev < min_value) { 1819 mixlev = default_value; 1820 if (*opt_param >= 0.0) { 1821 av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using " 1822 "default value: %0.3f\n", opt_name, list[mixlev]); 1823 } 1824 } 1825 *opt_param = list[mixlev]; 1826 *ctx_param = mixlev; 1827} 1828 1829 1830/** 1831 * Validate metadata options as set by AVOption system. 1832 * These values can optionally be changed per-frame. 1833 * 1834 * @param s AC-3 encoder private context 1835 */ 1836int ff_ac3_validate_metadata(AC3EncodeContext *s) 1837{ 1838 AVCodecContext *avctx = s->avctx; 1839 AC3EncOptions *opt = &s->options; 1840 1841 opt->audio_production_info = 0; 1842 opt->extended_bsi_1 = 0; 1843 opt->extended_bsi_2 = 0; 1844 opt->eac3_mixing_metadata = 0; 1845 opt->eac3_info_metadata = 0; 1846 1847 /* determine mixing metadata / xbsi1 use */ 1848 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) { 1849 opt->extended_bsi_1 = 1; 1850 opt->eac3_mixing_metadata = 1; 1851 } 1852 if (s->has_center && 1853 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) { 1854 opt->extended_bsi_1 = 1; 1855 opt->eac3_mixing_metadata = 1; 1856 } 1857 if (s->has_surround && 1858 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) { 1859 opt->extended_bsi_1 = 1; 1860 opt->eac3_mixing_metadata = 1; 1861 } 1862 1863 if (s->eac3) { 1864 /* determine info metadata use */ 1865 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN) 1866 opt->eac3_info_metadata = 1; 1867 if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE) 1868 opt->eac3_info_metadata = 1; 1869 if (s->channel_mode == AC3_CHMODE_STEREO && 1870 (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE)) 1871 opt->eac3_info_metadata = 1; 1872 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) 1873 opt->eac3_info_metadata = 1; 1874 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE || 1875 opt->ad_converter_type != AC3ENC_OPT_NONE) { 1876 opt->audio_production_info = 1; 1877 opt->eac3_info_metadata = 1; 1878 } 1879 } else { 1880 /* determine audio production info use */ 1881 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE) 1882 opt->audio_production_info = 1; 1883 1884 /* determine xbsi2 use */ 1885 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) 1886 opt->extended_bsi_2 = 1; 1887 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE) 1888 opt->extended_bsi_2 = 1; 1889 if (opt->ad_converter_type != AC3ENC_OPT_NONE) 1890 opt->extended_bsi_2 = 1; 1891 } 1892 1893 /* validate AC-3 mixing levels */ 1894 if (!s->eac3) { 1895 if (s->has_center) { 1896 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level, 1897 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0, 1898 &s->center_mix_level); 1899 } 1900 if (s->has_surround) { 1901 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level, 1902 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0, 1903 &s->surround_mix_level); 1904 } 1905 } 1906 1907 /* validate extended bsi 1 / mixing metadata */ 1908 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) { 1909 /* default preferred stereo downmix */ 1910 if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE) 1911 opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED; 1912 if (!s->eac3 || s->has_center) { 1913 /* validate Lt/Rt center mix level */ 1914 validate_mix_level(avctx, "ltrt_center_mix_level", 1915 &opt->ltrt_center_mix_level, extmixlev_options, 1916 EXTMIXLEV_NUM_OPTIONS, 5, 0, 1917 &s->ltrt_center_mix_level); 1918 /* validate Lo/Ro center mix level */ 1919 validate_mix_level(avctx, "loro_center_mix_level", 1920 &opt->loro_center_mix_level, extmixlev_options, 1921 EXTMIXLEV_NUM_OPTIONS, 5, 0, 1922 &s->loro_center_mix_level); 1923 } 1924 if (!s->eac3 || s->has_surround) { 1925 /* validate Lt/Rt surround mix level */ 1926 validate_mix_level(avctx, "ltrt_surround_mix_level", 1927 &opt->ltrt_surround_mix_level, extmixlev_options, 1928 EXTMIXLEV_NUM_OPTIONS, 6, 3, 1929 &s->ltrt_surround_mix_level); 1930 /* validate Lo/Ro surround mix level */ 1931 validate_mix_level(avctx, "loro_surround_mix_level", 1932 &opt->loro_surround_mix_level, extmixlev_options, 1933 EXTMIXLEV_NUM_OPTIONS, 6, 3, 1934 &s->loro_surround_mix_level); 1935 } 1936 } 1937 1938 /* validate audio service type / channels combination */ 1939 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE && 1940 avctx->channels == 1) || 1941 ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY || 1942 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY || 1943 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER) 1944 && avctx->channels > 1)) { 1945 av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the " 1946 "specified number of channels\n"); 1947 return AVERROR(EINVAL); 1948 } 1949 1950 /* validate extended bsi 2 / info metadata */ 1951 if (opt->extended_bsi_2 || opt->eac3_info_metadata) { 1952 /* default dolby headphone mode */ 1953 if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE) 1954 opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED; 1955 /* default dolby surround ex mode */ 1956 if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE) 1957 opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED; 1958 /* default A/D converter type */ 1959 if (opt->ad_converter_type == AC3ENC_OPT_NONE) 1960 opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD; 1961 } 1962 1963 /* copyright & original defaults */ 1964 if (!s->eac3 || opt->eac3_info_metadata) { 1965 /* default copyright */ 1966 if (opt->copyright == AC3ENC_OPT_NONE) 1967 opt->copyright = AC3ENC_OPT_OFF; 1968 /* default original */ 1969 if (opt->original == AC3ENC_OPT_NONE) 1970 opt->original = AC3ENC_OPT_ON; 1971 } 1972 1973 /* dolby surround mode default */ 1974 if (!s->eac3 || opt->eac3_info_metadata) { 1975 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE) 1976 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED; 1977 } 1978 1979 /* validate audio production info */ 1980 if (opt->audio_production_info) { 1981 if (opt->mixing_level == AC3ENC_OPT_NONE) { 1982 av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if " 1983 "room_type is set\n"); 1984 return AVERROR(EINVAL); 1985 } 1986 if (opt->mixing_level < 80) { 1987 av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between " 1988 "80dB and 111dB\n"); 1989 return AVERROR(EINVAL); 1990 } 1991 /* default room type */ 1992 if (opt->room_type == AC3ENC_OPT_NONE) 1993 opt->room_type = AC3ENC_OPT_NOT_INDICATED; 1994 } 1995 1996 /* set bitstream id for alternate bitstream syntax */ 1997 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) { 1998 if (s->bitstream_id > 8 && s->bitstream_id < 11) { 1999 static int warn_once = 1; 2000 if (warn_once) { 2001 av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is " 2002 "not compatible with reduced samplerates. writing of " 2003 "extended bitstream information will be disabled.\n"); 2004 warn_once = 0; 2005 } 2006 } else { 2007 s->bitstream_id = 6; 2008 } 2009 } 2010 2011 return 0; 2012} 2013 2014 2015/** 2016 * Finalize encoding and free any memory allocated by the encoder. 2017 * 2018 * @param avctx Codec context 2019 */ 2020av_cold int ff_ac3_encode_close(AVCodecContext *avctx) 2021{ 2022 int blk, ch; 2023 AC3EncodeContext *s = avctx->priv_data; 2024 2025 av_freep(&s->windowed_samples); 2026 for (ch = 0; ch < s->channels; ch++) 2027 av_freep(&s->planar_samples[ch]); 2028 av_freep(&s->planar_samples); 2029 av_freep(&s->bap_buffer); 2030 av_freep(&s->bap1_buffer); 2031 av_freep(&s->mdct_coef_buffer); 2032 av_freep(&s->fixed_coef_buffer); 2033 av_freep(&s->exp_buffer); 2034 av_freep(&s->grouped_exp_buffer); 2035 av_freep(&s->psd_buffer); 2036 av_freep(&s->band_psd_buffer); 2037 av_freep(&s->mask_buffer); 2038 av_freep(&s->qmant_buffer); 2039 av_freep(&s->cpl_coord_exp_buffer); 2040 av_freep(&s->cpl_coord_mant_buffer); 2041 for (blk = 0; blk < s->num_blocks; blk++) { 2042 AC3Block *block = &s->blocks[blk]; 2043 av_freep(&block->mdct_coef); 2044 av_freep(&block->fixed_coef); 2045 av_freep(&block->exp); 2046 av_freep(&block->grouped_exp); 2047 av_freep(&block->psd); 2048 av_freep(&block->band_psd); 2049 av_freep(&block->mask); 2050 av_freep(&block->qmant); 2051 av_freep(&block->cpl_coord_exp); 2052 av_freep(&block->cpl_coord_mant); 2053 } 2054 2055 s->mdct_end(s); 2056 2057 av_freep(&avctx->coded_frame); 2058 return 0; 2059} 2060 2061 2062/* 2063 * Set channel information during initialization. 2064 */ 2065static av_cold int set_channel_info(AC3EncodeContext *s, int channels, 2066 uint64_t *channel_layout) 2067{ 2068 int ch_layout; 2069 2070 if (channels < 1 || channels > AC3_MAX_CHANNELS) 2071 return AVERROR(EINVAL); 2072 if (*channel_layout > 0x7FF) 2073 return AVERROR(EINVAL); 2074 ch_layout = *channel_layout; 2075 if (!ch_layout) 2076 ch_layout = avcodec_guess_channel_layout(channels, CODEC_ID_AC3, NULL); 2077 2078 s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY); 2079 s->channels = channels; 2080 s->fbw_channels = channels - s->lfe_on; 2081 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1; 2082 if (s->lfe_on) 2083 ch_layout -= AV_CH_LOW_FREQUENCY; 2084 2085 switch (ch_layout) { 2086 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break; 2087 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break; 2088 case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break; 2089 case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break; 2090 case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break; 2091 case AV_CH_LAYOUT_QUAD: 2092 case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break; 2093 case AV_CH_LAYOUT_5POINT0: 2094 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break; 2095 default: 2096 return AVERROR(EINVAL); 2097 } 2098 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO; 2099 s->has_surround = s->channel_mode & 0x04; 2100 2101 s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on]; 2102 *channel_layout = ch_layout; 2103 if (s->lfe_on) 2104 *channel_layout |= AV_CH_LOW_FREQUENCY; 2105 2106 return 0; 2107} 2108 2109 2110static av_cold int validate_options(AC3EncodeContext *s) 2111{ 2112 AVCodecContext *avctx = s->avctx; 2113 int i, ret, max_sr; 2114 2115 /* validate channel layout */ 2116 if (!avctx->channel_layout) { 2117 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The " 2118 "encoder will guess the layout, but it " 2119 "might be incorrect.\n"); 2120 } 2121 ret = set_channel_info(s, avctx->channels, &avctx->channel_layout); 2122 if (ret) { 2123 av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n"); 2124 return ret; 2125 } 2126 2127 /* validate sample rate */ 2128 /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a 2129 decoder that supports half sample rate so we can validate that 2130 the generated files are correct. */ 2131 max_sr = s->eac3 ? 2 : 8; 2132 for (i = 0; i <= max_sr; i++) { 2133 if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate) 2134 break; 2135 } 2136 if (i > max_sr) { 2137 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n"); 2138 return AVERROR(EINVAL); 2139 } 2140 s->sample_rate = avctx->sample_rate; 2141 s->bit_alloc.sr_shift = i / 3; 2142 s->bit_alloc.sr_code = i % 3; 2143 s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift; 2144 2145 /* validate bit rate */ 2146 if (s->eac3) { 2147 int max_br, min_br, wpf, min_br_dist, min_br_code; 2148 int num_blks_code, num_blocks, frame_samples; 2149 2150 /* calculate min/max bitrate */ 2151 /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've 2152 found use either 6 blocks or 1 block, even though 2 or 3 blocks 2153 would work as far as the bit rate is concerned. */ 2154 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) { 2155 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code]; 2156 frame_samples = AC3_BLOCK_SIZE * num_blocks; 2157 max_br = 2048 * s->sample_rate / frame_samples * 16; 2158 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16; 2159 if (avctx->bit_rate <= max_br) 2160 break; 2161 } 2162 if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) { 2163 av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d " 2164 "for this sample rate\n", min_br, max_br); 2165 return AVERROR(EINVAL); 2166 } 2167 s->num_blks_code = num_blks_code; 2168 s->num_blocks = num_blocks; 2169 2170 /* calculate words-per-frame for the selected bitrate */ 2171 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate; 2172 av_assert1(wpf > 0 && wpf <= 2048); 2173 2174 /* find the closest AC-3 bitrate code to the selected bitrate. 2175 this is needed for lookup tables for bandwidth and coupling 2176 parameter selection */ 2177 min_br_code = -1; 2178 min_br_dist = INT_MAX; 2179 for (i = 0; i < 19; i++) { 2180 int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate); 2181 if (br_dist < min_br_dist) { 2182 min_br_dist = br_dist; 2183 min_br_code = i; 2184 } 2185 } 2186 2187 /* make sure the minimum frame size is below the average frame size */ 2188 s->frame_size_code = min_br_code << 1; 2189 while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate) 2190 wpf--; 2191 s->frame_size_min = 2 * wpf; 2192 } else { 2193 for (i = 0; i < 19; i++) { 2194 if ((ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift)*1000 == avctx->bit_rate) 2195 break; 2196 } 2197 if (i == 19) { 2198 av_log(avctx, AV_LOG_ERROR, "invalid bit rate\n"); 2199 return AVERROR(EINVAL); 2200 } 2201 s->frame_size_code = i << 1; 2202 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code]; 2203 s->num_blks_code = 0x3; 2204 s->num_blocks = 6; 2205 } 2206 s->bit_rate = avctx->bit_rate; 2207 s->frame_size = s->frame_size_min; 2208 2209 /* validate cutoff */ 2210 if (avctx->cutoff < 0) { 2211 av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n"); 2212 return AVERROR(EINVAL); 2213 } 2214 s->cutoff = avctx->cutoff; 2215 if (s->cutoff > (s->sample_rate >> 1)) 2216 s->cutoff = s->sample_rate >> 1; 2217 2218 ret = ff_ac3_validate_metadata(s); 2219 if (ret) 2220 return ret; 2221 2222 s->rematrixing_enabled = s->options.stereo_rematrixing && 2223 (s->channel_mode == AC3_CHMODE_STEREO); 2224 2225 s->cpl_enabled = s->options.channel_coupling && 2226 s->channel_mode >= AC3_CHMODE_STEREO; 2227 2228 return 0; 2229} 2230 2231 2232/* 2233 * Set bandwidth for all channels. 2234 * The user can optionally supply a cutoff frequency. Otherwise an appropriate 2235 * default value will be used. 2236 */ 2237static av_cold void set_bandwidth(AC3EncodeContext *s) 2238{ 2239 int blk, ch; 2240 int av_uninit(cpl_start); 2241 2242 if (s->cutoff) { 2243 /* calculate bandwidth based on user-specified cutoff frequency */ 2244 int fbw_coeffs; 2245 fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate; 2246 s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60); 2247 } else { 2248 /* use default bandwidth setting */ 2249 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2]; 2250 } 2251 2252 /* set number of coefficients for each channel */ 2253 for (ch = 1; ch <= s->fbw_channels; ch++) { 2254 s->start_freq[ch] = 0; 2255 for (blk = 0; blk < s->num_blocks; blk++) 2256 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73; 2257 } 2258 /* LFE channel always has 7 coefs */ 2259 if (s->lfe_on) { 2260 s->start_freq[s->lfe_channel] = 0; 2261 for (blk = 0; blk < s->num_blocks; blk++) 2262 s->blocks[blk].end_freq[ch] = 7; 2263 } 2264 2265 /* initialize coupling strategy */ 2266 if (s->cpl_enabled) { 2267 if (s->options.cpl_start != AC3ENC_OPT_AUTO) { 2268 cpl_start = s->options.cpl_start; 2269 } else { 2270 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2]; 2271 if (cpl_start < 0) { 2272 if (s->options.channel_coupling == AC3ENC_OPT_AUTO) 2273 s->cpl_enabled = 0; 2274 else 2275 cpl_start = 15; 2276 } 2277 } 2278 } 2279 if (s->cpl_enabled) { 2280 int i, cpl_start_band, cpl_end_band; 2281 uint8_t *cpl_band_sizes = s->cpl_band_sizes; 2282 2283 cpl_end_band = s->bandwidth_code / 4 + 3; 2284 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15)); 2285 2286 s->num_cpl_subbands = cpl_end_band - cpl_start_band; 2287 2288 s->num_cpl_bands = 1; 2289 *cpl_band_sizes = 12; 2290 for (i = cpl_start_band + 1; i < cpl_end_band; i++) { 2291 if (ff_eac3_default_cpl_band_struct[i]) { 2292 *cpl_band_sizes += 12; 2293 } else { 2294 s->num_cpl_bands++; 2295 cpl_band_sizes++; 2296 *cpl_band_sizes = 12; 2297 } 2298 } 2299 2300 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37; 2301 s->cpl_end_freq = cpl_end_band * 12 + 37; 2302 for (blk = 0; blk < s->num_blocks; blk++) 2303 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq; 2304 } 2305} 2306 2307 2308static av_cold int allocate_buffers(AC3EncodeContext *s) 2309{ 2310 AVCodecContext *avctx = s->avctx; 2311 int blk, ch; 2312 int channels = s->channels + 1; /* includes coupling channel */ 2313 int channel_blocks = channels * s->num_blocks; 2314 int total_coefs = AC3_MAX_COEFS * channel_blocks; 2315 2316 if (s->allocate_sample_buffers(s)) 2317 goto alloc_fail; 2318 2319 FF_ALLOC_OR_GOTO(avctx, s->bap_buffer, total_coefs * 2320 sizeof(*s->bap_buffer), alloc_fail); 2321 FF_ALLOC_OR_GOTO(avctx, s->bap1_buffer, total_coefs * 2322 sizeof(*s->bap1_buffer), alloc_fail); 2323 FF_ALLOCZ_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs * 2324 sizeof(*s->mdct_coef_buffer), alloc_fail); 2325 FF_ALLOC_OR_GOTO(avctx, s->exp_buffer, total_coefs * 2326 sizeof(*s->exp_buffer), alloc_fail); 2327 FF_ALLOC_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks * 128 * 2328 sizeof(*s->grouped_exp_buffer), alloc_fail); 2329 FF_ALLOC_OR_GOTO(avctx, s->psd_buffer, total_coefs * 2330 sizeof(*s->psd_buffer), alloc_fail); 2331 FF_ALLOC_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks * 64 * 2332 sizeof(*s->band_psd_buffer), alloc_fail); 2333 FF_ALLOC_OR_GOTO(avctx, s->mask_buffer, channel_blocks * 64 * 2334 sizeof(*s->mask_buffer), alloc_fail); 2335 FF_ALLOC_OR_GOTO(avctx, s->qmant_buffer, total_coefs * 2336 sizeof(*s->qmant_buffer), alloc_fail); 2337 if (s->cpl_enabled) { 2338 FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks * 16 * 2339 sizeof(*s->cpl_coord_exp_buffer), alloc_fail); 2340 FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks * 16 * 2341 sizeof(*s->cpl_coord_mant_buffer), alloc_fail); 2342 } 2343 for (blk = 0; blk < s->num_blocks; blk++) { 2344 AC3Block *block = &s->blocks[blk]; 2345 FF_ALLOCZ_OR_GOTO(avctx, block->mdct_coef, channels * sizeof(*block->mdct_coef), 2346 alloc_fail); 2347 FF_ALLOCZ_OR_GOTO(avctx, block->exp, channels * sizeof(*block->exp), 2348 alloc_fail); 2349 FF_ALLOCZ_OR_GOTO(avctx, block->grouped_exp, channels * sizeof(*block->grouped_exp), 2350 alloc_fail); 2351 FF_ALLOCZ_OR_GOTO(avctx, block->psd, channels * sizeof(*block->psd), 2352 alloc_fail); 2353 FF_ALLOCZ_OR_GOTO(avctx, block->band_psd, channels * sizeof(*block->band_psd), 2354 alloc_fail); 2355 FF_ALLOCZ_OR_GOTO(avctx, block->mask, channels * sizeof(*block->mask), 2356 alloc_fail); 2357 FF_ALLOCZ_OR_GOTO(avctx, block->qmant, channels * sizeof(*block->qmant), 2358 alloc_fail); 2359 if (s->cpl_enabled) { 2360 FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_exp, channels * sizeof(*block->cpl_coord_exp), 2361 alloc_fail); 2362 FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_mant, channels * sizeof(*block->cpl_coord_mant), 2363 alloc_fail); 2364 } 2365 2366 for (ch = 0; ch < channels; ch++) { 2367 /* arrangement: block, channel, coeff */ 2368 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)]; 2369 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; 2370 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)]; 2371 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)]; 2372 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; 2373 if (s->cpl_enabled) { 2374 block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)]; 2375 block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)]; 2376 } 2377 2378 /* arrangement: channel, block, coeff */ 2379 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; 2380 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; 2381 } 2382 } 2383 2384 if (!s->fixed_point) { 2385 FF_ALLOCZ_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs * 2386 sizeof(*s->fixed_coef_buffer), alloc_fail); 2387 for (blk = 0; blk < s->num_blocks; blk++) { 2388 AC3Block *block = &s->blocks[blk]; 2389 FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels * 2390 sizeof(*block->fixed_coef), alloc_fail); 2391 for (ch = 0; ch < channels; ch++) 2392 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; 2393 } 2394 } else { 2395 for (blk = 0; blk < s->num_blocks; blk++) { 2396 AC3Block *block = &s->blocks[blk]; 2397 FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels * 2398 sizeof(*block->fixed_coef), alloc_fail); 2399 for (ch = 0; ch < channels; ch++) 2400 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch]; 2401 } 2402 } 2403 2404 return 0; 2405alloc_fail: 2406 return AVERROR(ENOMEM); 2407} 2408 2409 2410av_cold int ff_ac3_encode_init(AVCodecContext *avctx) 2411{ 2412 AC3EncodeContext *s = avctx->priv_data; 2413 int ret, frame_size_58; 2414 2415 s->avctx = avctx; 2416 2417 s->eac3 = avctx->codec_id == CODEC_ID_EAC3; 2418 2419 ff_ac3_common_init(); 2420 2421 ret = validate_options(s); 2422 if (ret) 2423 return ret; 2424 2425 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks; 2426 2427 s->bitstream_mode = avctx->audio_service_type; 2428 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE) 2429 s->bitstream_mode = 0x7; 2430 2431 s->bits_written = 0; 2432 s->samples_written = 0; 2433 2434 /* calculate crc_inv for both possible frame sizes */ 2435 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1; 2436 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); 2437 if (s->bit_alloc.sr_code == 1) { 2438 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1; 2439 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); 2440 } 2441 2442 /* set function pointers */ 2443 if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) { 2444 s->mdct_end = ff_ac3_fixed_mdct_end; 2445 s->mdct_init = ff_ac3_fixed_mdct_init; 2446 s->allocate_sample_buffers = ff_ac3_fixed_allocate_sample_buffers; 2447 } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) { 2448 s->mdct_end = ff_ac3_float_mdct_end; 2449 s->mdct_init = ff_ac3_float_mdct_init; 2450 s->allocate_sample_buffers = ff_ac3_float_allocate_sample_buffers; 2451 } 2452 if (CONFIG_EAC3_ENCODER && s->eac3) 2453 s->output_frame_header = ff_eac3_output_frame_header; 2454 else 2455 s->output_frame_header = ac3_output_frame_header; 2456 2457 set_bandwidth(s); 2458 2459 exponent_init(s); 2460 2461 bit_alloc_init(s); 2462 2463 ret = s->mdct_init(s); 2464 if (ret) 2465 goto init_fail; 2466 2467 ret = allocate_buffers(s); 2468 if (ret) 2469 goto init_fail; 2470 2471 avctx->coded_frame= avcodec_alloc_frame(); 2472 2473 dsputil_init(&s->dsp, avctx); 2474 ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT); 2475 2476 dprint_options(s); 2477 2478 return 0; 2479init_fail: 2480 ff_ac3_encode_close(avctx); 2481 return ret; 2482} 2483