00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00029
00030
00031 #include <stdint.h>
00032
00033 #include "libavutil/avassert.h"
00034 #include "libavutil/avstring.h"
00035 #include "libavutil/channel_layout.h"
00036 #include "libavutil/crc.h"
00037 #include "libavutil/opt.h"
00038 #include "avcodec.h"
00039 #include "put_bits.h"
00040 #include "dsputil.h"
00041 #include "ac3dsp.h"
00042 #include "ac3.h"
00043 #include "fft.h"
00044 #include "ac3enc.h"
00045 #include "eac3enc.h"
00046
00047 typedef struct AC3Mant {
00048 int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr;
00049 int mant1_cnt, mant2_cnt, mant4_cnt;
00050 } AC3Mant;
00051
00052 #define CMIXLEV_NUM_OPTIONS 3
00053 static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
00054 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
00055 };
00056
00057 #define SURMIXLEV_NUM_OPTIONS 3
00058 static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
00059 LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
00060 };
00061
00062 #define EXTMIXLEV_NUM_OPTIONS 8
00063 static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = {
00064 LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB,
00065 LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
00066 };
00067
00068
00073 static uint8_t exponent_group_tab[2][3][256];
00074
00075
00079 const uint64_t ff_ac3_channel_layouts[19] = {
00080 AV_CH_LAYOUT_MONO,
00081 AV_CH_LAYOUT_STEREO,
00082 AV_CH_LAYOUT_2_1,
00083 AV_CH_LAYOUT_SURROUND,
00084 AV_CH_LAYOUT_2_2,
00085 AV_CH_LAYOUT_QUAD,
00086 AV_CH_LAYOUT_4POINT0,
00087 AV_CH_LAYOUT_5POINT0,
00088 AV_CH_LAYOUT_5POINT0_BACK,
00089 (AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY),
00090 (AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY),
00091 (AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY),
00092 (AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY),
00093 (AV_CH_LAYOUT_2_2 | AV_CH_LOW_FREQUENCY),
00094 (AV_CH_LAYOUT_QUAD | AV_CH_LOW_FREQUENCY),
00095 (AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY),
00096 AV_CH_LAYOUT_5POINT1,
00097 AV_CH_LAYOUT_5POINT1_BACK,
00098 0
00099 };
00100
00101
00107 static const uint8_t ac3_bandwidth_tab[5][3][19] = {
00108
00109
00110 { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
00111 { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
00112 { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
00113
00114 { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
00115 { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
00116 { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
00117
00118 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
00119 { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
00120 { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
00121
00122 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
00123 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
00124 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
00125
00126 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
00127 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
00128 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
00129 };
00130
00131
00140 static const int8_t ac3_coupling_start_tab[6][3][19] = {
00141
00142
00143
00144 { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 },
00145 { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
00146 { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
00147
00148
00149 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
00150 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
00151 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
00152
00153
00154 { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
00155 { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
00156 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
00157
00158
00159 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
00160 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
00161 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
00162
00163
00164 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
00165 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
00166 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
00167
00168
00169 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
00170 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
00171 { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
00172 };
00173
00174
00181 void ff_ac3_adjust_frame_size(AC3EncodeContext *s)
00182 {
00183 while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
00184 s->bits_written -= s->bit_rate;
00185 s->samples_written -= s->sample_rate;
00186 }
00187 s->frame_size = s->frame_size_min +
00188 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
00189 s->bits_written += s->frame_size * 8;
00190 s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
00191 }
00192
00193
00199 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
00200 {
00201 int blk, ch;
00202 int got_cpl_snr;
00203 int num_cpl_blocks;
00204
00205
00206
00207 for (blk = 0; blk < s->num_blocks; blk++) {
00208 AC3Block *block = &s->blocks[blk];
00209 for (ch = 1; ch <= s->fbw_channels; ch++)
00210 block->channel_in_cpl[ch] = s->cpl_on;
00211 }
00212
00213
00214
00215 got_cpl_snr = 0;
00216 num_cpl_blocks = 0;
00217 for (blk = 0; blk < s->num_blocks; blk++) {
00218 AC3Block *block = &s->blocks[blk];
00219 block->num_cpl_channels = 0;
00220 for (ch = 1; ch <= s->fbw_channels; ch++)
00221 block->num_cpl_channels += block->channel_in_cpl[ch];
00222 block->cpl_in_use = block->num_cpl_channels > 1;
00223 num_cpl_blocks += block->cpl_in_use;
00224 if (!block->cpl_in_use) {
00225 block->num_cpl_channels = 0;
00226 for (ch = 1; ch <= s->fbw_channels; ch++)
00227 block->channel_in_cpl[ch] = 0;
00228 }
00229
00230 block->new_cpl_strategy = !blk;
00231 if (blk) {
00232 for (ch = 1; ch <= s->fbw_channels; ch++) {
00233 if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
00234 block->new_cpl_strategy = 1;
00235 break;
00236 }
00237 }
00238 }
00239 block->new_cpl_leak = block->new_cpl_strategy;
00240
00241 if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
00242 block->new_snr_offsets = 1;
00243 if (block->cpl_in_use)
00244 got_cpl_snr = 1;
00245 } else {
00246 block->new_snr_offsets = 0;
00247 }
00248 }
00249 if (!num_cpl_blocks)
00250 s->cpl_on = 0;
00251
00252
00253 for (blk = 0; blk < s->num_blocks; blk++) {
00254 AC3Block *block = &s->blocks[blk];
00255 for (ch = 1; ch <= s->fbw_channels; ch++) {
00256 if (block->channel_in_cpl[ch])
00257 block->end_freq[ch] = s->start_freq[CPL_CH];
00258 else
00259 block->end_freq[ch] = s->bandwidth_code * 3 + 73;
00260 }
00261 }
00262 }
00263
00264
00270 void ff_ac3_apply_rematrixing(AC3EncodeContext *s)
00271 {
00272 int nb_coefs;
00273 int blk, bnd, i;
00274 int start, end;
00275 uint8_t *flags = NULL;
00276
00277 if (!s->rematrixing_enabled)
00278 return;
00279
00280 for (blk = 0; blk < s->num_blocks; blk++) {
00281 AC3Block *block = &s->blocks[blk];
00282 if (block->new_rematrixing_strategy)
00283 flags = block->rematrixing_flags;
00284 nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
00285 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
00286 if (flags[bnd]) {
00287 start = ff_ac3_rematrix_band_tab[bnd];
00288 end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
00289 for (i = start; i < end; i++) {
00290 int32_t lt = block->fixed_coef[1][i];
00291 int32_t rt = block->fixed_coef[2][i];
00292 block->fixed_coef[1][i] = (lt + rt) >> 1;
00293 block->fixed_coef[2][i] = (lt - rt) >> 1;
00294 }
00295 }
00296 }
00297 }
00298 }
00299
00300
00301
00302
00303
00304 static av_cold void exponent_init(AC3EncodeContext *s)
00305 {
00306 int expstr, i, grpsize;
00307
00308 for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
00309 grpsize = 3 << expstr;
00310 for (i = 12; i < 256; i++) {
00311 exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
00312 exponent_group_tab[1][expstr][i] = (i ) / grpsize;
00313 }
00314 }
00315
00316 exponent_group_tab[0][0][7] = 2;
00317
00318 if (CONFIG_EAC3_ENCODER && s->eac3)
00319 ff_eac3_exponent_init();
00320 }
00321
00322
00323
00324
00325
00326 static void extract_exponents(AC3EncodeContext *s)
00327 {
00328 int ch = !s->cpl_on;
00329 int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
00330 AC3Block *block = &s->blocks[0];
00331
00332 s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
00333 }
00334
00335
00340 #define EXP_DIFF_THRESHOLD 500
00341
00345 static const uint8_t exp_strategy_reuse_tab[4][6] = {
00346 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
00347 { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
00348 { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
00349 { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
00350 };
00351
00352
00353
00354
00355
00356 static void compute_exp_strategy(AC3EncodeContext *s)
00357 {
00358 int ch, blk, blk1;
00359
00360 for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
00361 uint8_t *exp_strategy = s->exp_strategy[ch];
00362 uint8_t *exp = s->blocks[0].exp[ch];
00363 int exp_diff;
00364
00365
00366
00367 exp_strategy[0] = EXP_NEW;
00368 exp += AC3_MAX_COEFS;
00369 for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
00370 if (ch == CPL_CH) {
00371 if (!s->blocks[blk-1].cpl_in_use) {
00372 exp_strategy[blk] = EXP_NEW;
00373 continue;
00374 } else if (!s->blocks[blk].cpl_in_use) {
00375 exp_strategy[blk] = EXP_REUSE;
00376 continue;
00377 }
00378 } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
00379 exp_strategy[blk] = EXP_NEW;
00380 continue;
00381 }
00382 exp_diff = s->dsp.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
00383 exp_strategy[blk] = EXP_REUSE;
00384 if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
00385 exp_strategy[blk] = EXP_NEW;
00386 else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
00387 exp_strategy[blk] = EXP_NEW;
00388 }
00389
00390
00391
00392 blk = 0;
00393 while (blk < s->num_blocks) {
00394 blk1 = blk + 1;
00395 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
00396 blk1++;
00397 exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
00398 blk = blk1;
00399 }
00400 }
00401 if (s->lfe_on) {
00402 ch = s->lfe_channel;
00403 s->exp_strategy[ch][0] = EXP_D15;
00404 for (blk = 1; blk < s->num_blocks; blk++)
00405 s->exp_strategy[ch][blk] = EXP_REUSE;
00406 }
00407
00408
00409 if (CONFIG_EAC3_ENCODER && s->eac3)
00410 ff_eac3_get_frame_exp_strategy(s);
00411 }
00412
00413
00422 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
00423 int cpl)
00424 {
00425 int nb_groups, i, k;
00426
00427 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
00428
00429
00430 switch(exp_strategy) {
00431 case EXP_D25:
00432 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
00433 uint8_t exp_min = exp[k];
00434 if (exp[k+1] < exp_min)
00435 exp_min = exp[k+1];
00436 exp[i-cpl] = exp_min;
00437 k += 2;
00438 }
00439 break;
00440 case EXP_D45:
00441 for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
00442 uint8_t exp_min = exp[k];
00443 if (exp[k+1] < exp_min)
00444 exp_min = exp[k+1];
00445 if (exp[k+2] < exp_min)
00446 exp_min = exp[k+2];
00447 if (exp[k+3] < exp_min)
00448 exp_min = exp[k+3];
00449 exp[i-cpl] = exp_min;
00450 k += 4;
00451 }
00452 break;
00453 }
00454
00455
00456 if (!cpl && exp[0] > 15)
00457 exp[0] = 15;
00458
00459
00460
00461 for (i = 1; i <= nb_groups; i++)
00462 exp[i] = FFMIN(exp[i], exp[i-1] + 2);
00463 i--;
00464 while (--i >= 0)
00465 exp[i] = FFMIN(exp[i], exp[i+1] + 2);
00466
00467 if (cpl)
00468 exp[-1] = exp[0] & ~1;
00469
00470
00471 switch (exp_strategy) {
00472 case EXP_D25:
00473 for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
00474 uint8_t exp1 = exp[i-cpl];
00475 exp[k--] = exp1;
00476 exp[k--] = exp1;
00477 }
00478 break;
00479 case EXP_D45:
00480 for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
00481 exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
00482 k -= 4;
00483 }
00484 break;
00485 }
00486 }
00487
00488
00489
00490
00491
00492
00493
00494
00495 static void encode_exponents(AC3EncodeContext *s)
00496 {
00497 int blk, blk1, ch, cpl;
00498 uint8_t *exp, *exp_strategy;
00499 int nb_coefs, num_reuse_blocks;
00500
00501 for (ch = !s->cpl_on; ch <= s->channels; ch++) {
00502 exp = s->blocks[0].exp[ch] + s->start_freq[ch];
00503 exp_strategy = s->exp_strategy[ch];
00504
00505 cpl = (ch == CPL_CH);
00506 blk = 0;
00507 while (blk < s->num_blocks) {
00508 AC3Block *block = &s->blocks[blk];
00509 if (cpl && !block->cpl_in_use) {
00510 exp += AC3_MAX_COEFS;
00511 blk++;
00512 continue;
00513 }
00514 nb_coefs = block->end_freq[ch] - s->start_freq[ch];
00515 blk1 = blk + 1;
00516
00517
00518
00519 s->exp_ref_block[ch][blk] = blk;
00520 while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
00521 s->exp_ref_block[ch][blk1] = blk;
00522 blk1++;
00523 }
00524 num_reuse_blocks = blk1 - blk - 1;
00525
00526
00527 s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
00528 AC3_MAX_COEFS);
00529
00530 encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
00531
00532 exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
00533 blk = blk1;
00534 }
00535 }
00536
00537
00538 s->ref_bap_set = 0;
00539 }
00540
00541
00542
00543
00544
00545 static int count_exponent_bits(AC3EncodeContext *s)
00546 {
00547 int blk, ch;
00548 int nb_groups, bit_count;
00549
00550 bit_count = 0;
00551 for (blk = 0; blk < s->num_blocks; blk++) {
00552 AC3Block *block = &s->blocks[blk];
00553 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
00554 int exp_strategy = s->exp_strategy[ch][blk];
00555 int cpl = (ch == CPL_CH);
00556 int nb_coefs = block->end_freq[ch] - s->start_freq[ch];
00557
00558 if (exp_strategy == EXP_REUSE)
00559 continue;
00560
00561 nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
00562 bit_count += 4 + (nb_groups * 7);
00563 }
00564 }
00565
00566 return bit_count;
00567 }
00568
00569
00577 void ff_ac3_group_exponents(AC3EncodeContext *s)
00578 {
00579 int blk, ch, i, cpl;
00580 int group_size, nb_groups;
00581 uint8_t *p;
00582 int delta0, delta1, delta2;
00583 int exp0, exp1;
00584
00585 for (blk = 0; blk < s->num_blocks; blk++) {
00586 AC3Block *block = &s->blocks[blk];
00587 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
00588 int exp_strategy = s->exp_strategy[ch][blk];
00589 if (exp_strategy == EXP_REUSE)
00590 continue;
00591 cpl = (ch == CPL_CH);
00592 group_size = exp_strategy + (exp_strategy == EXP_D45);
00593 nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
00594 p = block->exp[ch] + s->start_freq[ch] - cpl;
00595
00596
00597 exp1 = *p++;
00598 block->grouped_exp[ch][0] = exp1;
00599
00600
00601 for (i = 1; i <= nb_groups; i++) {
00602
00603 exp0 = exp1;
00604 exp1 = p[0];
00605 p += group_size;
00606 delta0 = exp1 - exp0 + 2;
00607 av_assert2(delta0 >= 0 && delta0 <= 4);
00608
00609 exp0 = exp1;
00610 exp1 = p[0];
00611 p += group_size;
00612 delta1 = exp1 - exp0 + 2;
00613 av_assert2(delta1 >= 0 && delta1 <= 4);
00614
00615 exp0 = exp1;
00616 exp1 = p[0];
00617 p += group_size;
00618 delta2 = exp1 - exp0 + 2;
00619 av_assert2(delta2 >= 0 && delta2 <= 4);
00620
00621 block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
00622 }
00623 }
00624 }
00625 }
00626
00627
00635 void ff_ac3_process_exponents(AC3EncodeContext *s)
00636 {
00637 extract_exponents(s);
00638
00639 compute_exp_strategy(s);
00640
00641 encode_exponents(s);
00642
00643 emms_c();
00644 }
00645
00646
00647
00648
00649
00650
00651 static void count_frame_bits_fixed(AC3EncodeContext *s)
00652 {
00653 static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
00654 int blk;
00655 int frame_bits;
00656
00657
00658
00659
00660
00661
00662
00663
00664
00665
00666
00667 frame_bits = 16;
00668 if (s->eac3) {
00669
00670 frame_bits += 35;
00671 frame_bits += 1 + 1;
00672 if (s->num_blocks != 0x6)
00673 frame_bits++;
00674 frame_bits++;
00675
00676 if (s->num_blocks == 6)
00677 frame_bits += 2;
00678 frame_bits += 10;
00679
00680 if (s->use_frame_exp_strategy)
00681 frame_bits += 5 * s->fbw_channels;
00682 else
00683 frame_bits += s->num_blocks * 2 * s->fbw_channels;
00684 if (s->lfe_on)
00685 frame_bits += s->num_blocks;
00686
00687 if (s->num_blks_code != 0x3)
00688 frame_bits++;
00689 else
00690 frame_bits += s->fbw_channels * 5;
00691
00692 frame_bits += 10;
00693
00694 if (s->num_blocks != 1)
00695 frame_bits++;
00696 } else {
00697 frame_bits += 49;
00698 frame_bits += frame_bits_inc[s->channel_mode];
00699 }
00700
00701
00702 for (blk = 0; blk < s->num_blocks; blk++) {
00703 if (!s->eac3) {
00704
00705 frame_bits += s->fbw_channels;
00706
00707
00708 frame_bits += s->fbw_channels;
00709 }
00710
00711
00712 frame_bits++;
00713
00714
00715 if (s->eac3)
00716 frame_bits++;
00717
00718 if (!s->eac3) {
00719
00720 frame_bits += 2 * s->fbw_channels;
00721 if (s->lfe_on)
00722 frame_bits++;
00723
00724
00725 frame_bits++;
00726 if (!blk)
00727 frame_bits += 2 + 2 + 2 + 2 + 3;
00728 }
00729
00730
00731 if (s->eac3)
00732 frame_bits++;
00733
00734 if (!s->eac3) {
00735
00736 frame_bits++;
00737
00738
00739 frame_bits++;
00740 }
00741 }
00742
00743
00744 frame_bits++;
00745
00746
00747 frame_bits += 1 + 16;
00748
00749 s->frame_bits_fixed = frame_bits;
00750 }
00751
00752
00753
00754
00755
00756
00757 static void bit_alloc_init(AC3EncodeContext *s)
00758 {
00759 int ch;
00760
00761
00762 s->slow_decay_code = 2;
00763 s->fast_decay_code = 1;
00764 s->slow_gain_code = 1;
00765 s->db_per_bit_code = s->eac3 ? 2 : 3;
00766 s->floor_code = 7;
00767 for (ch = 0; ch <= s->channels; ch++)
00768 s->fast_gain_code[ch] = 4;
00769
00770
00771 s->coarse_snr_offset = 40;
00772
00773
00774
00775
00776 s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift;
00777 s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift;
00778 s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code];
00779 s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
00780 s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code];
00781 s->bit_alloc.cpl_fast_leak = 0;
00782 s->bit_alloc.cpl_slow_leak = 0;
00783
00784 count_frame_bits_fixed(s);
00785 }
00786
00787
00788
00789
00790
00791
00792
00793 static void count_frame_bits(AC3EncodeContext *s)
00794 {
00795 AC3EncOptions *opt = &s->options;
00796 int blk, ch;
00797 int frame_bits = 0;
00798
00799
00800 if (s->eac3) {
00801 if (opt->eac3_mixing_metadata) {
00802 if (s->channel_mode > AC3_CHMODE_STEREO)
00803 frame_bits += 2;
00804 if (s->has_center)
00805 frame_bits += 6;
00806 if (s->has_surround)
00807 frame_bits += 6;
00808 frame_bits += s->lfe_on;
00809 frame_bits += 1 + 1 + 2;
00810 if (s->channel_mode < AC3_CHMODE_STEREO)
00811 frame_bits++;
00812 frame_bits++;
00813 }
00814 if (opt->eac3_info_metadata) {
00815 frame_bits += 3 + 1 + 1;
00816 if (s->channel_mode == AC3_CHMODE_STEREO)
00817 frame_bits += 2 + 2;
00818 if (s->channel_mode >= AC3_CHMODE_2F2R)
00819 frame_bits += 2;
00820 frame_bits++;
00821 if (opt->audio_production_info)
00822 frame_bits += 5 + 2 + 1;
00823 frame_bits++;
00824 }
00825
00826 if (s->channel_mode > AC3_CHMODE_MONO) {
00827 frame_bits++;
00828 for (blk = 1; blk < s->num_blocks; blk++) {
00829 AC3Block *block = &s->blocks[blk];
00830 frame_bits++;
00831 if (block->new_cpl_strategy)
00832 frame_bits++;
00833 }
00834 }
00835
00836 if (s->cpl_on) {
00837 if (s->use_frame_exp_strategy) {
00838 frame_bits += 5 * s->cpl_on;
00839 } else {
00840 for (blk = 0; blk < s->num_blocks; blk++)
00841 frame_bits += 2 * s->blocks[blk].cpl_in_use;
00842 }
00843 }
00844 } else {
00845 if (opt->audio_production_info)
00846 frame_bits += 7;
00847 if (s->bitstream_id == 6) {
00848 if (opt->extended_bsi_1)
00849 frame_bits += 14;
00850 if (opt->extended_bsi_2)
00851 frame_bits += 14;
00852 }
00853 }
00854
00855
00856 for (blk = 0; blk < s->num_blocks; blk++) {
00857 AC3Block *block = &s->blocks[blk];
00858
00859
00860 if (!s->eac3)
00861 frame_bits++;
00862 if (block->new_cpl_strategy) {
00863 if (!s->eac3)
00864 frame_bits++;
00865 if (block->cpl_in_use) {
00866 if (s->eac3)
00867 frame_bits++;
00868 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
00869 frame_bits += s->fbw_channels;
00870 if (s->channel_mode == AC3_CHMODE_STEREO)
00871 frame_bits++;
00872 frame_bits += 4 + 4;
00873 if (s->eac3)
00874 frame_bits++;
00875 else
00876 frame_bits += s->num_cpl_subbands - 1;
00877 }
00878 }
00879
00880
00881 if (block->cpl_in_use) {
00882 for (ch = 1; ch <= s->fbw_channels; ch++) {
00883 if (block->channel_in_cpl[ch]) {
00884 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
00885 frame_bits++;
00886 if (block->new_cpl_coords[ch]) {
00887 frame_bits += 2;
00888 frame_bits += (4 + 4) * s->num_cpl_bands;
00889 }
00890 }
00891 }
00892 }
00893
00894
00895 if (s->channel_mode == AC3_CHMODE_STEREO) {
00896 if (!s->eac3 || blk > 0)
00897 frame_bits++;
00898 if (s->blocks[blk].new_rematrixing_strategy)
00899 frame_bits += block->num_rematrixing_bands;
00900 }
00901
00902
00903 for (ch = 1; ch <= s->fbw_channels; ch++) {
00904 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
00905 if (!block->channel_in_cpl[ch])
00906 frame_bits += 6;
00907 frame_bits += 2;
00908 }
00909 }
00910
00911
00912 if (!s->eac3 && block->cpl_in_use)
00913 frame_bits += 2;
00914
00915
00916 if (!s->eac3) {
00917 frame_bits++;
00918 if (block->new_snr_offsets)
00919 frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
00920 }
00921
00922
00923 if (block->cpl_in_use) {
00924 if (!s->eac3 || block->new_cpl_leak != 2)
00925 frame_bits++;
00926 if (block->new_cpl_leak)
00927 frame_bits += 3 + 3;
00928 }
00929 }
00930
00931 s->frame_bits = s->frame_bits_fixed + frame_bits;
00932 }
00933
00934
00935
00936
00937
00938
00939 static void bit_alloc_masking(AC3EncodeContext *s)
00940 {
00941 int blk, ch;
00942
00943 for (blk = 0; blk < s->num_blocks; blk++) {
00944 AC3Block *block = &s->blocks[blk];
00945 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
00946
00947
00948
00949 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
00950 ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
00951 block->end_freq[ch], block->psd[ch],
00952 block->band_psd[ch]);
00953 ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
00954 s->start_freq[ch], block->end_freq[ch],
00955 ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
00956 ch == s->lfe_channel,
00957 DBA_NONE, 0, NULL, NULL, NULL,
00958 block->mask[ch]);
00959 }
00960 }
00961 }
00962 }
00963
00964
00965
00966
00967
00968
00969 static void reset_block_bap(AC3EncodeContext *s)
00970 {
00971 int blk, ch;
00972 uint8_t *ref_bap;
00973
00974 if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
00975 return;
00976
00977 ref_bap = s->bap_buffer;
00978 for (ch = 0; ch <= s->channels; ch++) {
00979 for (blk = 0; blk < s->num_blocks; blk++)
00980 s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
00981 ref_bap += AC3_MAX_COEFS * s->num_blocks;
00982 }
00983 s->ref_bap_set = 1;
00984 }
00985
00986
00994 static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
00995 {
00996 int blk;
00997
00998 for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
00999 memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
01000 mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
01001 mant_cnt[blk][4] = 1;
01002 }
01003 }
01004
01005
01016 static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
01017 uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
01018 int start, int end)
01019 {
01020 int blk;
01021
01022 for (blk = 0; blk < s->num_blocks; blk++) {
01023 AC3Block *block = &s->blocks[blk];
01024 if (ch == CPL_CH && !block->cpl_in_use)
01025 continue;
01026 s->ac3dsp.update_bap_counts(mant_cnt[blk],
01027 s->ref_bap[ch][blk] + start,
01028 FFMIN(end, block->end_freq[ch]) - start);
01029 }
01030 }
01031
01032
01033
01034
01035
01036 static int count_mantissa_bits(AC3EncodeContext *s)
01037 {
01038 int ch, max_end_freq;
01039 LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
01040
01041 count_mantissa_bits_init(mant_cnt);
01042
01043 max_end_freq = s->bandwidth_code * 3 + 73;
01044 for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
01045 count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
01046 max_end_freq);
01047
01048 return s->ac3dsp.compute_mantissa_size(mant_cnt);
01049 }
01050
01051
01062 static int bit_alloc(AC3EncodeContext *s, int snr_offset)
01063 {
01064 int blk, ch;
01065
01066 snr_offset = (snr_offset - 240) << 2;
01067
01068 reset_block_bap(s);
01069 for (blk = 0; blk < s->num_blocks; blk++) {
01070 AC3Block *block = &s->blocks[blk];
01071
01072 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
01073
01074
01075
01076
01077 if (s->exp_strategy[ch][blk] != EXP_REUSE) {
01078 s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
01079 s->start_freq[ch], block->end_freq[ch],
01080 snr_offset, s->bit_alloc.floor,
01081 ff_ac3_bap_tab, s->ref_bap[ch][blk]);
01082 }
01083 }
01084 }
01085 return count_mantissa_bits(s);
01086 }
01087
01088
01089
01090
01091
01092
01093 static int cbr_bit_allocation(AC3EncodeContext *s)
01094 {
01095 int ch;
01096 int bits_left;
01097 int snr_offset, snr_incr;
01098
01099 bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
01100 if (bits_left < 0)
01101 return AVERROR(EINVAL);
01102
01103 snr_offset = s->coarse_snr_offset << 4;
01104
01105
01106
01107 if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
01108 if (bit_alloc(s, 1023) <= bits_left)
01109 return 0;
01110 }
01111
01112 while (snr_offset >= 0 &&
01113 bit_alloc(s, snr_offset) > bits_left) {
01114 snr_offset -= 64;
01115 }
01116 if (snr_offset < 0)
01117 return AVERROR(EINVAL);
01118
01119 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
01120 for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
01121 while (snr_offset + snr_incr <= 1023 &&
01122 bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
01123 snr_offset += snr_incr;
01124 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
01125 }
01126 }
01127 FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
01128 reset_block_bap(s);
01129
01130 s->coarse_snr_offset = snr_offset >> 4;
01131 for (ch = !s->cpl_on; ch <= s->channels; ch++)
01132 s->fine_snr_offset[ch] = snr_offset & 0xF;
01133
01134 return 0;
01135 }
01136
01137
01138
01139
01140
01141
01142
01143
01144 int ff_ac3_compute_bit_allocation(AC3EncodeContext *s)
01145 {
01146 count_frame_bits(s);
01147
01148 s->exponent_bits = count_exponent_bits(s);
01149
01150 bit_alloc_masking(s);
01151
01152 return cbr_bit_allocation(s);
01153 }
01154
01155
01164 static inline int sym_quant(int c, int e, int levels)
01165 {
01166 int v = (((levels * c) >> (24 - e)) + levels) >> 1;
01167 av_assert2(v >= 0 && v < levels);
01168 return v;
01169 }
01170
01171
01180 static inline int asym_quant(int c, int e, int qbits)
01181 {
01182 int m;
01183
01184 c = (((c << e) >> (24 - qbits)) + 1) >> 1;
01185 m = (1 << (qbits-1));
01186 if (c >= m)
01187 c = m - 1;
01188 av_assert2(c >= -m);
01189 return c;
01190 }
01191
01192
01204 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
01205 uint8_t *exp, uint8_t *bap,
01206 int16_t *qmant, int start_freq,
01207 int end_freq)
01208 {
01209 int i;
01210
01211 for (i = start_freq; i < end_freq; i++) {
01212 int c = fixed_coef[i];
01213 int e = exp[i];
01214 int v = bap[i];
01215 if (v)
01216 switch (v) {
01217 case 1:
01218 v = sym_quant(c, e, 3);
01219 switch (s->mant1_cnt) {
01220 case 0:
01221 s->qmant1_ptr = &qmant[i];
01222 v = 9 * v;
01223 s->mant1_cnt = 1;
01224 break;
01225 case 1:
01226 *s->qmant1_ptr += 3 * v;
01227 s->mant1_cnt = 2;
01228 v = 128;
01229 break;
01230 default:
01231 *s->qmant1_ptr += v;
01232 s->mant1_cnt = 0;
01233 v = 128;
01234 break;
01235 }
01236 break;
01237 case 2:
01238 v = sym_quant(c, e, 5);
01239 switch (s->mant2_cnt) {
01240 case 0:
01241 s->qmant2_ptr = &qmant[i];
01242 v = 25 * v;
01243 s->mant2_cnt = 1;
01244 break;
01245 case 1:
01246 *s->qmant2_ptr += 5 * v;
01247 s->mant2_cnt = 2;
01248 v = 128;
01249 break;
01250 default:
01251 *s->qmant2_ptr += v;
01252 s->mant2_cnt = 0;
01253 v = 128;
01254 break;
01255 }
01256 break;
01257 case 3:
01258 v = sym_quant(c, e, 7);
01259 break;
01260 case 4:
01261 v = sym_quant(c, e, 11);
01262 switch (s->mant4_cnt) {
01263 case 0:
01264 s->qmant4_ptr = &qmant[i];
01265 v = 11 * v;
01266 s->mant4_cnt = 1;
01267 break;
01268 default:
01269 *s->qmant4_ptr += v;
01270 s->mant4_cnt = 0;
01271 v = 128;
01272 break;
01273 }
01274 break;
01275 case 5:
01276 v = sym_quant(c, e, 15);
01277 break;
01278 case 14:
01279 v = asym_quant(c, e, 14);
01280 break;
01281 case 15:
01282 v = asym_quant(c, e, 16);
01283 break;
01284 default:
01285 v = asym_quant(c, e, v - 1);
01286 break;
01287 }
01288 qmant[i] = v;
01289 }
01290 }
01291
01292
01298 void ff_ac3_quantize_mantissas(AC3EncodeContext *s)
01299 {
01300 int blk, ch, ch0=0, got_cpl;
01301
01302 for (blk = 0; blk < s->num_blocks; blk++) {
01303 AC3Block *block = &s->blocks[blk];
01304 AC3Mant m = { 0 };
01305
01306 got_cpl = !block->cpl_in_use;
01307 for (ch = 1; ch <= s->channels; ch++) {
01308 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
01309 ch0 = ch - 1;
01310 ch = CPL_CH;
01311 got_cpl = 1;
01312 }
01313 quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
01314 s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
01315 s->ref_bap[ch][blk], block->qmant[ch],
01316 s->start_freq[ch], block->end_freq[ch]);
01317 if (ch == CPL_CH)
01318 ch = ch0;
01319 }
01320 }
01321 }
01322
01323
01324
01325
01326
01327 static void ac3_output_frame_header(AC3EncodeContext *s)
01328 {
01329 AC3EncOptions *opt = &s->options;
01330
01331 put_bits(&s->pb, 16, 0x0b77);
01332 put_bits(&s->pb, 16, 0);
01333 put_bits(&s->pb, 2, s->bit_alloc.sr_code);
01334 put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
01335 put_bits(&s->pb, 5, s->bitstream_id);
01336 put_bits(&s->pb, 3, s->bitstream_mode);
01337 put_bits(&s->pb, 3, s->channel_mode);
01338 if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
01339 put_bits(&s->pb, 2, s->center_mix_level);
01340 if (s->channel_mode & 0x04)
01341 put_bits(&s->pb, 2, s->surround_mix_level);
01342 if (s->channel_mode == AC3_CHMODE_STEREO)
01343 put_bits(&s->pb, 2, opt->dolby_surround_mode);
01344 put_bits(&s->pb, 1, s->lfe_on);
01345 put_bits(&s->pb, 5, -opt->dialogue_level);
01346 put_bits(&s->pb, 1, 0);
01347 put_bits(&s->pb, 1, 0);
01348 put_bits(&s->pb, 1, opt->audio_production_info);
01349 if (opt->audio_production_info) {
01350 put_bits(&s->pb, 5, opt->mixing_level - 80);
01351 put_bits(&s->pb, 2, opt->room_type);
01352 }
01353 put_bits(&s->pb, 1, opt->copyright);
01354 put_bits(&s->pb, 1, opt->original);
01355 if (s->bitstream_id == 6) {
01356
01357 put_bits(&s->pb, 1, opt->extended_bsi_1);
01358 if (opt->extended_bsi_1) {
01359 put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
01360 put_bits(&s->pb, 3, s->ltrt_center_mix_level);
01361 put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
01362 put_bits(&s->pb, 3, s->loro_center_mix_level);
01363 put_bits(&s->pb, 3, s->loro_surround_mix_level);
01364 }
01365 put_bits(&s->pb, 1, opt->extended_bsi_2);
01366 if (opt->extended_bsi_2) {
01367 put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
01368 put_bits(&s->pb, 2, opt->dolby_headphone_mode);
01369 put_bits(&s->pb, 1, opt->ad_converter_type);
01370 put_bits(&s->pb, 9, 0);
01371 }
01372 } else {
01373 put_bits(&s->pb, 1, 0);
01374 put_bits(&s->pb, 1, 0);
01375 }
01376 put_bits(&s->pb, 1, 0);
01377 }
01378
01379
01380
01381
01382
01383 static void output_audio_block(AC3EncodeContext *s, int blk)
01384 {
01385 int ch, i, baie, bnd, got_cpl, ch0;
01386 AC3Block *block = &s->blocks[blk];
01387
01388
01389 if (!s->eac3) {
01390 for (ch = 0; ch < s->fbw_channels; ch++)
01391 put_bits(&s->pb, 1, 0);
01392 }
01393
01394
01395 if (!s->eac3) {
01396 for (ch = 0; ch < s->fbw_channels; ch++)
01397 put_bits(&s->pb, 1, 1);
01398 }
01399
01400
01401 put_bits(&s->pb, 1, 0);
01402
01403
01404 if (s->eac3)
01405 put_bits(&s->pb, 1, 0);
01406
01407
01408 if (!s->eac3)
01409 put_bits(&s->pb, 1, block->new_cpl_strategy);
01410 if (block->new_cpl_strategy) {
01411 if (!s->eac3)
01412 put_bits(&s->pb, 1, block->cpl_in_use);
01413 if (block->cpl_in_use) {
01414 int start_sub, end_sub;
01415 if (s->eac3)
01416 put_bits(&s->pb, 1, 0);
01417 if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
01418 for (ch = 1; ch <= s->fbw_channels; ch++)
01419 put_bits(&s->pb, 1, block->channel_in_cpl[ch]);
01420 }
01421 if (s->channel_mode == AC3_CHMODE_STEREO)
01422 put_bits(&s->pb, 1, 0);
01423 start_sub = (s->start_freq[CPL_CH] - 37) / 12;
01424 end_sub = (s->cpl_end_freq - 37) / 12;
01425 put_bits(&s->pb, 4, start_sub);
01426 put_bits(&s->pb, 4, end_sub - 3);
01427
01428 if (s->eac3) {
01429 put_bits(&s->pb, 1, 0);
01430 } else {
01431 for (bnd = start_sub+1; bnd < end_sub; bnd++)
01432 put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
01433 }
01434 }
01435 }
01436
01437
01438 if (block->cpl_in_use) {
01439 for (ch = 1; ch <= s->fbw_channels; ch++) {
01440 if (block->channel_in_cpl[ch]) {
01441 if (!s->eac3 || block->new_cpl_coords[ch] != 2)
01442 put_bits(&s->pb, 1, block->new_cpl_coords[ch]);
01443 if (block->new_cpl_coords[ch]) {
01444 put_bits(&s->pb, 2, block->cpl_master_exp[ch]);
01445 for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
01446 put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]);
01447 put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]);
01448 }
01449 }
01450 }
01451 }
01452 }
01453
01454
01455 if (s->channel_mode == AC3_CHMODE_STEREO) {
01456 if (!s->eac3 || blk > 0)
01457 put_bits(&s->pb, 1, block->new_rematrixing_strategy);
01458 if (block->new_rematrixing_strategy) {
01459
01460 for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
01461 put_bits(&s->pb, 1, block->rematrixing_flags[bnd]);
01462 }
01463 }
01464
01465
01466 if (!s->eac3) {
01467 for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
01468 put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
01469 if (s->lfe_on)
01470 put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
01471 }
01472
01473
01474 for (ch = 1; ch <= s->fbw_channels; ch++) {
01475 if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
01476 put_bits(&s->pb, 6, s->bandwidth_code);
01477 }
01478
01479
01480 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
01481 int nb_groups;
01482 int cpl = (ch == CPL_CH);
01483
01484 if (s->exp_strategy[ch][blk] == EXP_REUSE)
01485 continue;
01486
01487
01488 put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl);
01489
01490
01491 nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
01492 for (i = 1; i <= nb_groups; i++)
01493 put_bits(&s->pb, 7, block->grouped_exp[ch][i]);
01494
01495
01496 if (ch != s->lfe_channel && !cpl)
01497 put_bits(&s->pb, 2, 0);
01498 }
01499
01500
01501 if (!s->eac3) {
01502 baie = (blk == 0);
01503 put_bits(&s->pb, 1, baie);
01504 if (baie) {
01505 put_bits(&s->pb, 2, s->slow_decay_code);
01506 put_bits(&s->pb, 2, s->fast_decay_code);
01507 put_bits(&s->pb, 2, s->slow_gain_code);
01508 put_bits(&s->pb, 2, s->db_per_bit_code);
01509 put_bits(&s->pb, 3, s->floor_code);
01510 }
01511 }
01512
01513
01514 if (!s->eac3) {
01515 put_bits(&s->pb, 1, block->new_snr_offsets);
01516 if (block->new_snr_offsets) {
01517 put_bits(&s->pb, 6, s->coarse_snr_offset);
01518 for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
01519 put_bits(&s->pb, 4, s->fine_snr_offset[ch]);
01520 put_bits(&s->pb, 3, s->fast_gain_code[ch]);
01521 }
01522 }
01523 } else {
01524 put_bits(&s->pb, 1, 0);
01525 }
01526
01527
01528 if (block->cpl_in_use) {
01529 if (!s->eac3 || block->new_cpl_leak != 2)
01530 put_bits(&s->pb, 1, block->new_cpl_leak);
01531 if (block->new_cpl_leak) {
01532 put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak);
01533 put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak);
01534 }
01535 }
01536
01537 if (!s->eac3) {
01538 put_bits(&s->pb, 1, 0);
01539 put_bits(&s->pb, 1, 0);
01540 }
01541
01542
01543 got_cpl = !block->cpl_in_use;
01544 for (ch = 1; ch <= s->channels; ch++) {
01545 int b, q;
01546
01547 if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
01548 ch0 = ch - 1;
01549 ch = CPL_CH;
01550 got_cpl = 1;
01551 }
01552 for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
01553 q = block->qmant[ch][i];
01554 b = s->ref_bap[ch][blk][i];
01555 switch (b) {
01556 case 0: break;
01557 case 1: if (q != 128) put_bits (&s->pb, 5, q); break;
01558 case 2: if (q != 128) put_bits (&s->pb, 7, q); break;
01559 case 3: put_sbits(&s->pb, 3, q); break;
01560 case 4: if (q != 128) put_bits (&s->pb, 7, q); break;
01561 case 14: put_sbits(&s->pb, 14, q); break;
01562 case 15: put_sbits(&s->pb, 16, q); break;
01563 default: put_sbits(&s->pb, b-1, q); break;
01564 }
01565 }
01566 if (ch == CPL_CH)
01567 ch = ch0;
01568 }
01569 }
01570
01571
01573 #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
01574
01575
01576 static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
01577 {
01578 unsigned int c;
01579
01580 c = 0;
01581 while (a) {
01582 if (a & 1)
01583 c ^= b;
01584 a = a >> 1;
01585 b = b << 1;
01586 if (b & (1 << 16))
01587 b ^= poly;
01588 }
01589 return c;
01590 }
01591
01592
01593 static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
01594 {
01595 unsigned int r;
01596 r = 1;
01597 while (n) {
01598 if (n & 1)
01599 r = mul_poly(r, a, poly);
01600 a = mul_poly(a, a, poly);
01601 n >>= 1;
01602 }
01603 return r;
01604 }
01605
01606
01607
01608
01609
01610 static void output_frame_end(AC3EncodeContext *s)
01611 {
01612 const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
01613 int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv;
01614 uint8_t *frame;
01615
01616 frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
01617
01618
01619 av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18);
01620 flush_put_bits(&s->pb);
01621 frame = s->pb.buf;
01622 pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2;
01623 av_assert2(pad_bytes >= 0);
01624 if (pad_bytes > 0)
01625 memset(put_bits_ptr(&s->pb), 0, pad_bytes);
01626
01627 if (s->eac3) {
01628
01629 crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5);
01630 } else {
01631
01632
01633 crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
01634 crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
01635 crc1 = mul_poly(crc_inv, crc1, CRC16_POLY);
01636 AV_WB16(frame + 2, crc1);
01637
01638
01639 crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58,
01640 s->frame_size - frame_size_58 - 3);
01641 }
01642 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
01643
01644 if (crc2 == 0x770B) {
01645 frame[s->frame_size - 3] ^= 0x1;
01646 crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
01647 }
01648 crc2 = av_bswap16(crc2);
01649 AV_WB16(frame + s->frame_size - 2, crc2);
01650 }
01651
01652
01659 void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
01660 {
01661 int blk;
01662
01663 init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE);
01664
01665 s->output_frame_header(s);
01666
01667 for (blk = 0; blk < s->num_blocks; blk++)
01668 output_audio_block(s, blk);
01669
01670 output_frame_end(s);
01671 }
01672
01673
01674 static void dprint_options(AC3EncodeContext *s)
01675 {
01676 #ifdef DEBUG
01677 AVCodecContext *avctx = s->avctx;
01678 AC3EncOptions *opt = &s->options;
01679 char strbuf[32];
01680
01681 switch (s->bitstream_id) {
01682 case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break;
01683 case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break;
01684 case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break;
01685 case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break;
01686 case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break;
01687 default: snprintf(strbuf, 32, "ERROR");
01688 }
01689 av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id);
01690 av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
01691 av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout);
01692 av_dlog(avctx, "channel_layout: %s\n", strbuf);
01693 av_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
01694 av_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
01695 av_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
01696 if (s->cutoff)
01697 av_dlog(avctx, "cutoff: %d\n", s->cutoff);
01698
01699 av_dlog(avctx, "per_frame_metadata: %s\n",
01700 opt->allow_per_frame_metadata?"on":"off");
01701 if (s->has_center)
01702 av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
01703 s->center_mix_level);
01704 else
01705 av_dlog(avctx, "center_mixlev: {not written}\n");
01706 if (s->has_surround)
01707 av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
01708 s->surround_mix_level);
01709 else
01710 av_dlog(avctx, "surround_mixlev: {not written}\n");
01711 if (opt->audio_production_info) {
01712 av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
01713 switch (opt->room_type) {
01714 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
01715 case AC3ENC_OPT_LARGE_ROOM: av_strlcpy(strbuf, "large", 32); break;
01716 case AC3ENC_OPT_SMALL_ROOM: av_strlcpy(strbuf, "small", 32); break;
01717 default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type);
01718 }
01719 av_dlog(avctx, "room_type: %s\n", strbuf);
01720 } else {
01721 av_dlog(avctx, "mixing_level: {not written}\n");
01722 av_dlog(avctx, "room_type: {not written}\n");
01723 }
01724 av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
01725 av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
01726 if (s->channel_mode == AC3_CHMODE_STEREO) {
01727 switch (opt->dolby_surround_mode) {
01728 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
01729 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break;
01730 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break;
01731 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode);
01732 }
01733 av_dlog(avctx, "dsur_mode: %s\n", strbuf);
01734 } else {
01735 av_dlog(avctx, "dsur_mode: {not written}\n");
01736 }
01737 av_dlog(avctx, "original: %s\n", opt->original?"on":"off");
01738
01739 if (s->bitstream_id == 6) {
01740 if (opt->extended_bsi_1) {
01741 switch (opt->preferred_stereo_downmix) {
01742 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
01743 case AC3ENC_OPT_DOWNMIX_LTRT: av_strlcpy(strbuf, "ltrt", 32); break;
01744 case AC3ENC_OPT_DOWNMIX_LORO: av_strlcpy(strbuf, "loro", 32); break;
01745 default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix);
01746 }
01747 av_dlog(avctx, "dmix_mode: %s\n", strbuf);
01748 av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
01749 opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
01750 av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
01751 opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
01752 av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
01753 opt->loro_center_mix_level, s->loro_center_mix_level);
01754 av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
01755 opt->loro_surround_mix_level, s->loro_surround_mix_level);
01756 } else {
01757 av_dlog(avctx, "extended bitstream info 1: {not written}\n");
01758 }
01759 if (opt->extended_bsi_2) {
01760 switch (opt->dolby_surround_ex_mode) {
01761 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
01762 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break;
01763 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break;
01764 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode);
01765 }
01766 av_dlog(avctx, "dsurex_mode: %s\n", strbuf);
01767 switch (opt->dolby_headphone_mode) {
01768 case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
01769 case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break;
01770 case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break;
01771 default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode);
01772 }
01773 av_dlog(avctx, "dheadphone_mode: %s\n", strbuf);
01774
01775 switch (opt->ad_converter_type) {
01776 case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break;
01777 case AC3ENC_OPT_ADCONV_HDCD: av_strlcpy(strbuf, "hdcd", 32); break;
01778 default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type);
01779 }
01780 av_dlog(avctx, "ad_conv_type: %s\n", strbuf);
01781 } else {
01782 av_dlog(avctx, "extended bitstream info 2: {not written}\n");
01783 }
01784 }
01785 #endif
01786 }
01787
01788
01789 #define FLT_OPTION_THRESHOLD 0.01
01790
01791 static int validate_float_option(float v, const float *v_list, int v_list_size)
01792 {
01793 int i;
01794
01795 for (i = 0; i < v_list_size; i++) {
01796 if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
01797 v > (v_list[i] - FLT_OPTION_THRESHOLD))
01798 break;
01799 }
01800 if (i == v_list_size)
01801 return -1;
01802
01803 return i;
01804 }
01805
01806
01807 static void validate_mix_level(void *log_ctx, const char *opt_name,
01808 float *opt_param, const float *list,
01809 int list_size, int default_value, int min_value,
01810 int *ctx_param)
01811 {
01812 int mixlev = validate_float_option(*opt_param, list, list_size);
01813 if (mixlev < min_value) {
01814 mixlev = default_value;
01815 if (*opt_param >= 0.0) {
01816 av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
01817 "default value: %0.3f\n", opt_name, list[mixlev]);
01818 }
01819 }
01820 *opt_param = list[mixlev];
01821 *ctx_param = mixlev;
01822 }
01823
01824
01831 int ff_ac3_validate_metadata(AC3EncodeContext *s)
01832 {
01833 AVCodecContext *avctx = s->avctx;
01834 AC3EncOptions *opt = &s->options;
01835
01836 opt->audio_production_info = 0;
01837 opt->extended_bsi_1 = 0;
01838 opt->extended_bsi_2 = 0;
01839 opt->eac3_mixing_metadata = 0;
01840 opt->eac3_info_metadata = 0;
01841
01842
01843 if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
01844 opt->extended_bsi_1 = 1;
01845 opt->eac3_mixing_metadata = 1;
01846 }
01847 if (s->has_center &&
01848 (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
01849 opt->extended_bsi_1 = 1;
01850 opt->eac3_mixing_metadata = 1;
01851 }
01852 if (s->has_surround &&
01853 (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
01854 opt->extended_bsi_1 = 1;
01855 opt->eac3_mixing_metadata = 1;
01856 }
01857
01858 if (s->eac3) {
01859
01860 if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
01861 opt->eac3_info_metadata = 1;
01862 if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE)
01863 opt->eac3_info_metadata = 1;
01864 if (s->channel_mode == AC3_CHMODE_STEREO &&
01865 (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE))
01866 opt->eac3_info_metadata = 1;
01867 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
01868 opt->eac3_info_metadata = 1;
01869 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE ||
01870 opt->ad_converter_type != AC3ENC_OPT_NONE) {
01871 opt->audio_production_info = 1;
01872 opt->eac3_info_metadata = 1;
01873 }
01874 } else {
01875
01876 if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
01877 opt->audio_production_info = 1;
01878
01879
01880 if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
01881 opt->extended_bsi_2 = 1;
01882 if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
01883 opt->extended_bsi_2 = 1;
01884 if (opt->ad_converter_type != AC3ENC_OPT_NONE)
01885 opt->extended_bsi_2 = 1;
01886 }
01887
01888
01889 if (!s->eac3) {
01890 if (s->has_center) {
01891 validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
01892 cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
01893 &s->center_mix_level);
01894 }
01895 if (s->has_surround) {
01896 validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
01897 surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
01898 &s->surround_mix_level);
01899 }
01900 }
01901
01902
01903 if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
01904
01905 if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
01906 opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
01907 if (!s->eac3 || s->has_center) {
01908
01909 validate_mix_level(avctx, "ltrt_center_mix_level",
01910 &opt->ltrt_center_mix_level, extmixlev_options,
01911 EXTMIXLEV_NUM_OPTIONS, 5, 0,
01912 &s->ltrt_center_mix_level);
01913
01914 validate_mix_level(avctx, "loro_center_mix_level",
01915 &opt->loro_center_mix_level, extmixlev_options,
01916 EXTMIXLEV_NUM_OPTIONS, 5, 0,
01917 &s->loro_center_mix_level);
01918 }
01919 if (!s->eac3 || s->has_surround) {
01920
01921 validate_mix_level(avctx, "ltrt_surround_mix_level",
01922 &opt->ltrt_surround_mix_level, extmixlev_options,
01923 EXTMIXLEV_NUM_OPTIONS, 6, 3,
01924 &s->ltrt_surround_mix_level);
01925
01926 validate_mix_level(avctx, "loro_surround_mix_level",
01927 &opt->loro_surround_mix_level, extmixlev_options,
01928 EXTMIXLEV_NUM_OPTIONS, 6, 3,
01929 &s->loro_surround_mix_level);
01930 }
01931 }
01932
01933
01934 if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
01935 avctx->channels == 1) ||
01936 ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
01937 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
01938 avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
01939 && avctx->channels > 1)) {
01940 av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
01941 "specified number of channels\n");
01942 return AVERROR(EINVAL);
01943 }
01944
01945
01946 if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
01947
01948 if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
01949 opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
01950
01951 if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
01952 opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
01953
01954 if (opt->ad_converter_type == AC3ENC_OPT_NONE)
01955 opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
01956 }
01957
01958
01959 if (!s->eac3 || opt->eac3_info_metadata) {
01960
01961 if (opt->copyright == AC3ENC_OPT_NONE)
01962 opt->copyright = AC3ENC_OPT_OFF;
01963
01964 if (opt->original == AC3ENC_OPT_NONE)
01965 opt->original = AC3ENC_OPT_ON;
01966 }
01967
01968
01969 if (!s->eac3 || opt->eac3_info_metadata) {
01970 if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
01971 opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
01972 }
01973
01974
01975 if (opt->audio_production_info) {
01976 if (opt->mixing_level == AC3ENC_OPT_NONE) {
01977 av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
01978 "room_type is set\n");
01979 return AVERROR(EINVAL);
01980 }
01981 if (opt->mixing_level < 80) {
01982 av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
01983 "80dB and 111dB\n");
01984 return AVERROR(EINVAL);
01985 }
01986
01987 if (opt->room_type == AC3ENC_OPT_NONE)
01988 opt->room_type = AC3ENC_OPT_NOT_INDICATED;
01989 }
01990
01991
01992 if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) {
01993 if (s->bitstream_id > 8 && s->bitstream_id < 11) {
01994 static int warn_once = 1;
01995 if (warn_once) {
01996 av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is "
01997 "not compatible with reduced samplerates. writing of "
01998 "extended bitstream information will be disabled.\n");
01999 warn_once = 0;
02000 }
02001 } else {
02002 s->bitstream_id = 6;
02003 }
02004 }
02005
02006 return 0;
02007 }
02008
02009
02015 av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
02016 {
02017 int blk, ch;
02018 AC3EncodeContext *s = avctx->priv_data;
02019
02020 av_freep(&s->windowed_samples);
02021 for (ch = 0; ch < s->channels; ch++)
02022 av_freep(&s->planar_samples[ch]);
02023 av_freep(&s->planar_samples);
02024 av_freep(&s->bap_buffer);
02025 av_freep(&s->bap1_buffer);
02026 av_freep(&s->mdct_coef_buffer);
02027 av_freep(&s->fixed_coef_buffer);
02028 av_freep(&s->exp_buffer);
02029 av_freep(&s->grouped_exp_buffer);
02030 av_freep(&s->psd_buffer);
02031 av_freep(&s->band_psd_buffer);
02032 av_freep(&s->mask_buffer);
02033 av_freep(&s->qmant_buffer);
02034 av_freep(&s->cpl_coord_exp_buffer);
02035 av_freep(&s->cpl_coord_mant_buffer);
02036 for (blk = 0; blk < s->num_blocks; blk++) {
02037 AC3Block *block = &s->blocks[blk];
02038 av_freep(&block->mdct_coef);
02039 av_freep(&block->fixed_coef);
02040 av_freep(&block->exp);
02041 av_freep(&block->grouped_exp);
02042 av_freep(&block->psd);
02043 av_freep(&block->band_psd);
02044 av_freep(&block->mask);
02045 av_freep(&block->qmant);
02046 av_freep(&block->cpl_coord_exp);
02047 av_freep(&block->cpl_coord_mant);
02048 }
02049
02050 s->mdct_end(s);
02051
02052 #if FF_API_OLD_ENCODE_AUDIO
02053 av_freep(&avctx->coded_frame);
02054 #endif
02055 return 0;
02056 }
02057
02058
02059
02060
02061
02062 static av_cold int set_channel_info(AC3EncodeContext *s, int channels,
02063 uint64_t *channel_layout)
02064 {
02065 int ch_layout;
02066
02067 if (channels < 1 || channels > AC3_MAX_CHANNELS)
02068 return AVERROR(EINVAL);
02069 if (*channel_layout > 0x7FF)
02070 return AVERROR(EINVAL);
02071 ch_layout = *channel_layout;
02072 if (!ch_layout)
02073 ch_layout = av_get_default_channel_layout(channels);
02074
02075 s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY);
02076 s->channels = channels;
02077 s->fbw_channels = channels - s->lfe_on;
02078 s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1;
02079 if (s->lfe_on)
02080 ch_layout -= AV_CH_LOW_FREQUENCY;
02081
02082 switch (ch_layout) {
02083 case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break;
02084 case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break;
02085 case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break;
02086 case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break;
02087 case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break;
02088 case AV_CH_LAYOUT_QUAD:
02089 case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break;
02090 case AV_CH_LAYOUT_5POINT0:
02091 case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break;
02092 default:
02093 return AVERROR(EINVAL);
02094 }
02095 s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
02096 s->has_surround = s->channel_mode & 0x04;
02097
02098 s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on];
02099 *channel_layout = ch_layout;
02100 if (s->lfe_on)
02101 *channel_layout |= AV_CH_LOW_FREQUENCY;
02102
02103 return 0;
02104 }
02105
02106
02107 static av_cold int validate_options(AC3EncodeContext *s)
02108 {
02109 AVCodecContext *avctx = s->avctx;
02110 int i, ret, max_sr;
02111
02112
02113 if (!avctx->channel_layout) {
02114 av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The "
02115 "encoder will guess the layout, but it "
02116 "might be incorrect.\n");
02117 }
02118 ret = set_channel_info(s, avctx->channels, &avctx->channel_layout);
02119 if (ret) {
02120 av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n");
02121 return ret;
02122 }
02123
02124
02125
02126
02127
02128 max_sr = s->eac3 ? 2 : 8;
02129 for (i = 0; i <= max_sr; i++) {
02130 if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate)
02131 break;
02132 }
02133 if (i > max_sr) {
02134 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
02135 return AVERROR(EINVAL);
02136 }
02137 s->sample_rate = avctx->sample_rate;
02138 s->bit_alloc.sr_shift = i / 3;
02139 s->bit_alloc.sr_code = i % 3;
02140 s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift;
02141
02142
02143 if (!avctx->bit_rate) {
02144 switch (s->fbw_channels) {
02145 case 1: avctx->bit_rate = 96000; break;
02146 case 2: avctx->bit_rate = 192000; break;
02147 case 3: avctx->bit_rate = 320000; break;
02148 case 4: avctx->bit_rate = 384000; break;
02149 case 5: avctx->bit_rate = 448000; break;
02150 }
02151 }
02152
02153
02154 if (s->eac3) {
02155 int max_br, min_br, wpf, min_br_dist, min_br_code;
02156 int num_blks_code, num_blocks, frame_samples;
02157
02158
02159
02160
02161
02162 for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
02163 num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
02164 frame_samples = AC3_BLOCK_SIZE * num_blocks;
02165 max_br = 2048 * s->sample_rate / frame_samples * 16;
02166 min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
02167 if (avctx->bit_rate <= max_br)
02168 break;
02169 }
02170 if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
02171 av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
02172 "for this sample rate\n", min_br, max_br);
02173 return AVERROR(EINVAL);
02174 }
02175 s->num_blks_code = num_blks_code;
02176 s->num_blocks = num_blocks;
02177
02178
02179 wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
02180 av_assert1(wpf > 0 && wpf <= 2048);
02181
02182
02183
02184
02185 min_br_code = -1;
02186 min_br_dist = INT_MAX;
02187 for (i = 0; i < 19; i++) {
02188 int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
02189 if (br_dist < min_br_dist) {
02190 min_br_dist = br_dist;
02191 min_br_code = i;
02192 }
02193 }
02194
02195
02196 s->frame_size_code = min_br_code << 1;
02197 while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
02198 wpf--;
02199 s->frame_size_min = 2 * wpf;
02200 } else {
02201 int best_br = 0, best_code = 0, best_diff = INT_MAX;
02202 for (i = 0; i < 19; i++) {
02203 int br = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000;
02204 int diff = abs(br - avctx->bit_rate);
02205 if (diff < best_diff) {
02206 best_br = br;
02207 best_code = i;
02208 best_diff = diff;
02209 }
02210 if (!best_diff)
02211 break;
02212 }
02213 avctx->bit_rate = best_br;
02214 s->frame_size_code = best_code << 1;
02215 s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
02216 s->num_blks_code = 0x3;
02217 s->num_blocks = 6;
02218 }
02219 s->bit_rate = avctx->bit_rate;
02220 s->frame_size = s->frame_size_min;
02221
02222
02223 if (avctx->cutoff < 0) {
02224 av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
02225 return AVERROR(EINVAL);
02226 }
02227 s->cutoff = avctx->cutoff;
02228 if (s->cutoff > (s->sample_rate >> 1))
02229 s->cutoff = s->sample_rate >> 1;
02230
02231 ret = ff_ac3_validate_metadata(s);
02232 if (ret)
02233 return ret;
02234
02235 s->rematrixing_enabled = s->options.stereo_rematrixing &&
02236 (s->channel_mode == AC3_CHMODE_STEREO);
02237
02238 s->cpl_enabled = s->options.channel_coupling &&
02239 s->channel_mode >= AC3_CHMODE_STEREO;
02240
02241 return 0;
02242 }
02243
02244
02245
02246
02247
02248
02249
02250 static av_cold void set_bandwidth(AC3EncodeContext *s)
02251 {
02252 int blk, ch, cpl_start;
02253
02254 if (s->cutoff) {
02255
02256 int fbw_coeffs;
02257 fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
02258 s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
02259 } else {
02260
02261 s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
02262 }
02263
02264
02265 for (ch = 1; ch <= s->fbw_channels; ch++) {
02266 s->start_freq[ch] = 0;
02267 for (blk = 0; blk < s->num_blocks; blk++)
02268 s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
02269 }
02270
02271 if (s->lfe_on) {
02272 s->start_freq[s->lfe_channel] = 0;
02273 for (blk = 0; blk < s->num_blocks; blk++)
02274 s->blocks[blk].end_freq[ch] = 7;
02275 }
02276
02277
02278 if (s->cpl_enabled) {
02279 if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
02280 cpl_start = s->options.cpl_start;
02281 } else {
02282 cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
02283 if (cpl_start < 0) {
02284 if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
02285 s->cpl_enabled = 0;
02286 else
02287 cpl_start = 15;
02288 }
02289 }
02290 }
02291 if (s->cpl_enabled) {
02292 int i, cpl_start_band, cpl_end_band;
02293 uint8_t *cpl_band_sizes = s->cpl_band_sizes;
02294
02295 cpl_end_band = s->bandwidth_code / 4 + 3;
02296 cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
02297
02298 s->num_cpl_subbands = cpl_end_band - cpl_start_band;
02299
02300 s->num_cpl_bands = 1;
02301 *cpl_band_sizes = 12;
02302 for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
02303 if (ff_eac3_default_cpl_band_struct[i]) {
02304 *cpl_band_sizes += 12;
02305 } else {
02306 s->num_cpl_bands++;
02307 cpl_band_sizes++;
02308 *cpl_band_sizes = 12;
02309 }
02310 }
02311
02312 s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
02313 s->cpl_end_freq = cpl_end_band * 12 + 37;
02314 for (blk = 0; blk < s->num_blocks; blk++)
02315 s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
02316 }
02317 }
02318
02319
02320 static av_cold int allocate_buffers(AC3EncodeContext *s)
02321 {
02322 AVCodecContext *avctx = s->avctx;
02323 int blk, ch;
02324 int channels = s->channels + 1;
02325 int channel_blocks = channels * s->num_blocks;
02326 int total_coefs = AC3_MAX_COEFS * channel_blocks;
02327
02328 if (s->allocate_sample_buffers(s))
02329 goto alloc_fail;
02330
02331 FF_ALLOC_OR_GOTO(avctx, s->bap_buffer, total_coefs *
02332 sizeof(*s->bap_buffer), alloc_fail);
02333 FF_ALLOC_OR_GOTO(avctx, s->bap1_buffer, total_coefs *
02334 sizeof(*s->bap1_buffer), alloc_fail);
02335 FF_ALLOCZ_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs *
02336 sizeof(*s->mdct_coef_buffer), alloc_fail);
02337 FF_ALLOC_OR_GOTO(avctx, s->exp_buffer, total_coefs *
02338 sizeof(*s->exp_buffer), alloc_fail);
02339 FF_ALLOC_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks * 128 *
02340 sizeof(*s->grouped_exp_buffer), alloc_fail);
02341 FF_ALLOC_OR_GOTO(avctx, s->psd_buffer, total_coefs *
02342 sizeof(*s->psd_buffer), alloc_fail);
02343 FF_ALLOC_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks * 64 *
02344 sizeof(*s->band_psd_buffer), alloc_fail);
02345 FF_ALLOC_OR_GOTO(avctx, s->mask_buffer, channel_blocks * 64 *
02346 sizeof(*s->mask_buffer), alloc_fail);
02347 FF_ALLOC_OR_GOTO(avctx, s->qmant_buffer, total_coefs *
02348 sizeof(*s->qmant_buffer), alloc_fail);
02349 if (s->cpl_enabled) {
02350 FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks * 16 *
02351 sizeof(*s->cpl_coord_exp_buffer), alloc_fail);
02352 FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks * 16 *
02353 sizeof(*s->cpl_coord_mant_buffer), alloc_fail);
02354 }
02355 for (blk = 0; blk < s->num_blocks; blk++) {
02356 AC3Block *block = &s->blocks[blk];
02357 FF_ALLOCZ_OR_GOTO(avctx, block->mdct_coef, channels * sizeof(*block->mdct_coef),
02358 alloc_fail);
02359 FF_ALLOCZ_OR_GOTO(avctx, block->exp, channels * sizeof(*block->exp),
02360 alloc_fail);
02361 FF_ALLOCZ_OR_GOTO(avctx, block->grouped_exp, channels * sizeof(*block->grouped_exp),
02362 alloc_fail);
02363 FF_ALLOCZ_OR_GOTO(avctx, block->psd, channels * sizeof(*block->psd),
02364 alloc_fail);
02365 FF_ALLOCZ_OR_GOTO(avctx, block->band_psd, channels * sizeof(*block->band_psd),
02366 alloc_fail);
02367 FF_ALLOCZ_OR_GOTO(avctx, block->mask, channels * sizeof(*block->mask),
02368 alloc_fail);
02369 FF_ALLOCZ_OR_GOTO(avctx, block->qmant, channels * sizeof(*block->qmant),
02370 alloc_fail);
02371 if (s->cpl_enabled) {
02372 FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_exp, channels * sizeof(*block->cpl_coord_exp),
02373 alloc_fail);
02374 FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_mant, channels * sizeof(*block->cpl_coord_mant),
02375 alloc_fail);
02376 }
02377
02378 for (ch = 0; ch < channels; ch++) {
02379
02380 block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
02381 block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
02382 block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];
02383 block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)];
02384 block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
02385 if (s->cpl_enabled) {
02386 block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)];
02387 block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)];
02388 }
02389
02390
02391 block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
02392 block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
02393 }
02394 }
02395
02396 if (!s->fixed_point) {
02397 FF_ALLOCZ_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs *
02398 sizeof(*s->fixed_coef_buffer), alloc_fail);
02399 for (blk = 0; blk < s->num_blocks; blk++) {
02400 AC3Block *block = &s->blocks[blk];
02401 FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels *
02402 sizeof(*block->fixed_coef), alloc_fail);
02403 for (ch = 0; ch < channels; ch++)
02404 block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
02405 }
02406 } else {
02407 for (blk = 0; blk < s->num_blocks; blk++) {
02408 AC3Block *block = &s->blocks[blk];
02409 FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels *
02410 sizeof(*block->fixed_coef), alloc_fail);
02411 for (ch = 0; ch < channels; ch++)
02412 block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
02413 }
02414 }
02415
02416 return 0;
02417 alloc_fail:
02418 return AVERROR(ENOMEM);
02419 }
02420
02421
02422 av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
02423 {
02424 AC3EncodeContext *s = avctx->priv_data;
02425 int ret, frame_size_58;
02426
02427 s->avctx = avctx;
02428
02429 s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3;
02430
02431 ff_ac3_common_init();
02432
02433 ret = validate_options(s);
02434 if (ret)
02435 return ret;
02436
02437 avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
02438 avctx->delay = AC3_BLOCK_SIZE;
02439
02440 s->bitstream_mode = avctx->audio_service_type;
02441 if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
02442 s->bitstream_mode = 0x7;
02443
02444 s->bits_written = 0;
02445 s->samples_written = 0;
02446
02447
02448 frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1;
02449 s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
02450 if (s->bit_alloc.sr_code == 1) {
02451 frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
02452 s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
02453 }
02454
02455
02456 if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) {
02457 s->mdct_end = ff_ac3_fixed_mdct_end;
02458 s->mdct_init = ff_ac3_fixed_mdct_init;
02459 s->allocate_sample_buffers = ff_ac3_fixed_allocate_sample_buffers;
02460 } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) {
02461 s->mdct_end = ff_ac3_float_mdct_end;
02462 s->mdct_init = ff_ac3_float_mdct_init;
02463 s->allocate_sample_buffers = ff_ac3_float_allocate_sample_buffers;
02464 }
02465 if (CONFIG_EAC3_ENCODER && s->eac3)
02466 s->output_frame_header = ff_eac3_output_frame_header;
02467 else
02468 s->output_frame_header = ac3_output_frame_header;
02469
02470 set_bandwidth(s);
02471
02472 exponent_init(s);
02473
02474 bit_alloc_init(s);
02475
02476 ret = s->mdct_init(s);
02477 if (ret)
02478 goto init_fail;
02479
02480 ret = allocate_buffers(s);
02481 if (ret)
02482 goto init_fail;
02483
02484 #if FF_API_OLD_ENCODE_AUDIO
02485 avctx->coded_frame= avcodec_alloc_frame();
02486 if (!avctx->coded_frame) {
02487 ret = AVERROR(ENOMEM);
02488 goto init_fail;
02489 }
02490 #endif
02491
02492 ff_dsputil_init(&s->dsp, avctx);
02493 avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
02494 ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT);
02495
02496 dprint_options(s);
02497
02498 return 0;
02499 init_fail:
02500 ff_ac3_encode_close(avctx);
02501 return ret;
02502 }