1/* 2 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file libavcodec/vorbis_enc.c 23 * Native Vorbis encoder. 24 * @author Oded Shimon <ods15@ods15.dyndns.org> 25 */ 26 27#include <float.h> 28#include "avcodec.h" 29#include "dsputil.h" 30#include "vorbis.h" 31#include "vorbis_enc_data.h" 32 33#define BITSTREAM_WRITER_LE 34#include "bitstream.h" 35 36#undef NDEBUG 37#include <assert.h> 38 39typedef struct { 40 int nentries; 41 uint8_t * lens; 42 uint32_t * codewords; 43 int ndimentions; 44 float min; 45 float delta; 46 int seq_p; 47 int lookup; 48 int * quantlist; 49 float * dimentions; 50 float * pow2; 51} vorbis_enc_codebook; 52 53typedef struct { 54 int dim; 55 int subclass; 56 int masterbook; 57 int * books; 58} vorbis_enc_floor_class; 59 60typedef struct { 61 int partitions; 62 int * partition_to_class; 63 int nclasses; 64 vorbis_enc_floor_class * classes; 65 int multiplier; 66 int rangebits; 67 int values; 68 vorbis_floor1_entry * list; 69} vorbis_enc_floor; 70 71typedef struct { 72 int type; 73 int begin; 74 int end; 75 int partition_size; 76 int classifications; 77 int classbook; 78 int8_t (*books)[8]; 79 float (*maxes)[2]; 80} vorbis_enc_residue; 81 82typedef struct { 83 int submaps; 84 int * mux; 85 int * floor; 86 int * residue; 87 int coupling_steps; 88 int * magnitude; 89 int * angle; 90} vorbis_enc_mapping; 91 92typedef struct { 93 int blockflag; 94 int mapping; 95} vorbis_enc_mode; 96 97typedef struct { 98 int channels; 99 int sample_rate; 100 int log2_blocksize[2]; 101 MDCTContext mdct[2]; 102 const float * win[2]; 103 int have_saved; 104 float * saved; 105 float * samples; 106 float * floor; // also used for tmp values for mdct 107 float * coeffs; // also used for residue after floor 108 float quality; 109 110 int ncodebooks; 111 vorbis_enc_codebook * codebooks; 112 113 int nfloors; 114 vorbis_enc_floor * floors; 115 116 int nresidues; 117 vorbis_enc_residue * residues; 118 119 int nmappings; 120 vorbis_enc_mapping * mappings; 121 122 int nmodes; 123 vorbis_enc_mode * modes; 124 125 int64_t sample_count; 126} vorbis_enc_context; 127 128static inline void put_codeword(PutBitContext * pb, vorbis_enc_codebook * cb, int entry) { 129 assert(entry >= 0); 130 assert(entry < cb->nentries); 131 assert(cb->lens[entry]); 132 put_bits(pb, cb->lens[entry], cb->codewords[entry]); 133} 134 135static int cb_lookup_vals(int lookup, int dimentions, int entries) { 136 if (lookup == 1) return ff_vorbis_nth_root(entries, dimentions); 137 else if (lookup == 2) return dimentions * entries; 138 return 0; 139} 140 141static void ready_codebook(vorbis_enc_codebook * cb) { 142 int i; 143 144 ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries); 145 146 if (!cb->lookup) 147 cb->pow2 = cb->dimentions = NULL; 148 else { 149 int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); 150 cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions); 151 cb->pow2 = av_mallocz(sizeof(float) * cb->nentries); 152 for (i = 0; i < cb->nentries; i++) { 153 float last = 0; 154 int j; 155 int div = 1; 156 for (j = 0; j < cb->ndimentions; j++) { 157 int off; 158 if (cb->lookup == 1) 159 off = (i / div) % vals; // lookup type 1 160 else 161 off = i * cb->ndimentions + j; // lookup type 2 162 163 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta; 164 if (cb->seq_p) 165 last = cb->dimentions[i * cb->ndimentions + j]; 166 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j]*cb->dimentions[i * cb->ndimentions + j]; 167 div *= vals; 168 } 169 cb->pow2[i] /= 2.; 170 } 171 } 172} 173 174static void ready_residue(vorbis_enc_residue * rc, vorbis_enc_context * venc) { 175 int i; 176 assert(rc->type == 2); 177 rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications); 178 for (i = 0; i < rc->classifications; i++) { 179 int j; 180 vorbis_enc_codebook * cb; 181 for (j = 0; j < 8; j++) 182 if (rc->books[i][j] != -1) break; 183 if (j == 8) continue; // zero 184 cb = &venc->codebooks[rc->books[i][j]]; 185 assert(cb->ndimentions >= 2); 186 assert(cb->lookup); 187 188 for (j = 0; j < cb->nentries; j++) { 189 float a; 190 if (!cb->lens[j]) continue; 191 a = fabs(cb->dimentions[j * cb->ndimentions]); 192 if (a > rc->maxes[i][0]) 193 rc->maxes[i][0] = a; 194 a = fabs(cb->dimentions[j * cb->ndimentions + 1]); 195 if (a > rc->maxes[i][1]) 196 rc->maxes[i][1] = a; 197 } 198 } 199 // small bias 200 for (i = 0; i < rc->classifications; i++) { 201 rc->maxes[i][0] += 0.8; 202 rc->maxes[i][1] += 0.8; 203 } 204} 205 206static void create_vorbis_context(vorbis_enc_context * venc, AVCodecContext * avccontext) { 207 vorbis_enc_floor * fc; 208 vorbis_enc_residue * rc; 209 vorbis_enc_mapping * mc; 210 int i, book; 211 212 venc->channels = avccontext->channels; 213 venc->sample_rate = avccontext->sample_rate; 214 venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11; 215 216 venc->ncodebooks = FF_ARRAY_ELEMS(cvectors); 217 venc->codebooks = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks); 218 219 // codebook 0..14 - floor1 book, values 0..255 220 // codebook 15 residue masterbook 221 // codebook 16..29 residue 222 for (book = 0; book < venc->ncodebooks; book++) { 223 vorbis_enc_codebook * cb = &venc->codebooks[book]; 224 int vals; 225 cb->ndimentions = cvectors[book].dim; 226 cb->nentries = cvectors[book].real_len; 227 cb->min = cvectors[book].min; 228 cb->delta = cvectors[book].delta; 229 cb->lookup = cvectors[book].lookup; 230 cb->seq_p = 0; 231 232 cb->lens = av_malloc(sizeof(uint8_t) * cb->nentries); 233 cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries); 234 memcpy(cb->lens, cvectors[book].clens, cvectors[book].len); 235 memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len); 236 237 if (cb->lookup) { 238 vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); 239 cb->quantlist = av_malloc(sizeof(int) * vals); 240 for (i = 0; i < vals; i++) 241 cb->quantlist[i] = cvectors[book].quant[i]; 242 } else { 243 cb->quantlist = NULL; 244 } 245 ready_codebook(cb); 246 } 247 248 venc->nfloors = 1; 249 venc->floors = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors); 250 251 // just 1 floor 252 fc = &venc->floors[0]; 253 fc->partitions = 8; 254 fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions); 255 fc->nclasses = 0; 256 for (i = 0; i < fc->partitions; i++) { 257 static const int a[] = {0,1,2,2,3,3,4,4}; 258 fc->partition_to_class[i] = a[i]; 259 fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]); 260 } 261 fc->nclasses++; 262 fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses); 263 for (i = 0; i < fc->nclasses; i++) { 264 vorbis_enc_floor_class * c = &fc->classes[i]; 265 int j, books; 266 c->dim = floor_classes[i].dim; 267 c->subclass = floor_classes[i].subclass; 268 c->masterbook = floor_classes[i].masterbook; 269 books = (1 << c->subclass); 270 c->books = av_malloc(sizeof(int) * books); 271 for (j = 0; j < books; j++) 272 c->books[j] = floor_classes[i].nbooks[j]; 273 } 274 fc->multiplier = 2; 275 fc->rangebits = venc->log2_blocksize[0] - 1; 276 277 fc->values = 2; 278 for (i = 0; i < fc->partitions; i++) 279 fc->values += fc->classes[fc->partition_to_class[i]].dim; 280 281 fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values); 282 fc->list[0].x = 0; 283 fc->list[1].x = 1 << fc->rangebits; 284 for (i = 2; i < fc->values; i++) { 285 static const int a[] = { 286 93, 23,372, 6, 46,186,750, 14, 33, 65, 287 130,260,556, 3, 10, 18, 28, 39, 55, 79, 288 111,158,220,312,464,650,850 289 }; 290 fc->list[i].x = a[i - 2]; 291 } 292 ff_vorbis_ready_floor1_list(fc->list, fc->values); 293 294 venc->nresidues = 1; 295 venc->residues = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues); 296 297 // single residue 298 rc = &venc->residues[0]; 299 rc->type = 2; 300 rc->begin = 0; 301 rc->end = 1600; 302 rc->partition_size = 32; 303 rc->classifications = 10; 304 rc->classbook = 15; 305 rc->books = av_malloc(sizeof(*rc->books) * rc->classifications); 306 { 307 static const int8_t a[10][8] = { 308 { -1, -1, -1, -1, -1, -1, -1, -1, }, 309 { -1, -1, 16, -1, -1, -1, -1, -1, }, 310 { -1, -1, 17, -1, -1, -1, -1, -1, }, 311 { -1, -1, 18, -1, -1, -1, -1, -1, }, 312 { -1, -1, 19, -1, -1, -1, -1, -1, }, 313 { -1, -1, 20, -1, -1, -1, -1, -1, }, 314 { -1, -1, 21, -1, -1, -1, -1, -1, }, 315 { 22, 23, -1, -1, -1, -1, -1, -1, }, 316 { 24, 25, -1, -1, -1, -1, -1, -1, }, 317 { 26, 27, 28, -1, -1, -1, -1, -1, }, 318 }; 319 memcpy(rc->books, a, sizeof a); 320 } 321 ready_residue(rc, venc); 322 323 venc->nmappings = 1; 324 venc->mappings = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings); 325 326 // single mapping 327 mc = &venc->mappings[0]; 328 mc->submaps = 1; 329 mc->mux = av_malloc(sizeof(int) * venc->channels); 330 for (i = 0; i < venc->channels; i++) 331 mc->mux[i] = 0; 332 mc->floor = av_malloc(sizeof(int) * mc->submaps); 333 mc->residue = av_malloc(sizeof(int) * mc->submaps); 334 for (i = 0; i < mc->submaps; i++) { 335 mc->floor[i] = 0; 336 mc->residue[i] = 0; 337 } 338 mc->coupling_steps = venc->channels == 2 ? 1 : 0; 339 mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps); 340 mc->angle = av_malloc(sizeof(int) * mc->coupling_steps); 341 if (mc->coupling_steps) { 342 mc->magnitude[0] = 0; 343 mc->angle[0] = 1; 344 } 345 346 venc->nmodes = 1; 347 venc->modes = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes); 348 349 // single mode 350 venc->modes[0].blockflag = 0; 351 venc->modes[0].mapping = 0; 352 353 venc->have_saved = 0; 354 venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); 355 venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1])); 356 venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); 357 venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); 358 359 venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6]; 360 venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6]; 361 362 ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0); 363 ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0); 364} 365 366static void put_float(PutBitContext * pb, float f) { 367 int exp, mant; 368 uint32_t res = 0; 369 mant = (int)ldexp(frexp(f, &exp), 20); 370 exp += 788 - 20; 371 if (mant < 0) { res |= (1 << 31); mant = -mant; } 372 res |= mant | (exp << 21); 373 put_bits(pb, 32, res); 374} 375 376static void put_codebook_header(PutBitContext * pb, vorbis_enc_codebook * cb) { 377 int i; 378 int ordered = 0; 379 380 put_bits(pb, 24, 0x564342); //magic 381 put_bits(pb, 16, cb->ndimentions); 382 put_bits(pb, 24, cb->nentries); 383 384 for (i = 1; i < cb->nentries; i++) 385 if (cb->lens[i] < cb->lens[i-1]) break; 386 if (i == cb->nentries) 387 ordered = 1; 388 389 put_bits(pb, 1, ordered); 390 if (ordered) { 391 int len = cb->lens[0]; 392 put_bits(pb, 5, len - 1); 393 i = 0; 394 while (i < cb->nentries) { 395 int j; 396 for (j = 0; j+i < cb->nentries; j++) 397 if (cb->lens[j+i] != len) break; 398 put_bits(pb, ilog(cb->nentries - i), j); 399 i += j; 400 len++; 401 } 402 } else { 403 int sparse = 0; 404 for (i = 0; i < cb->nentries; i++) 405 if (!cb->lens[i]) break; 406 if (i != cb->nentries) 407 sparse = 1; 408 put_bits(pb, 1, sparse); 409 410 for (i = 0; i < cb->nentries; i++) { 411 if (sparse) put_bits(pb, 1, !!cb->lens[i]); 412 if (cb->lens[i]) put_bits(pb, 5, cb->lens[i] - 1); 413 } 414 } 415 416 put_bits(pb, 4, cb->lookup); 417 if (cb->lookup) { 418 int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries); 419 int bits = ilog(cb->quantlist[0]); 420 421 for (i = 1; i < tmp; i++) 422 bits = FFMAX(bits, ilog(cb->quantlist[i])); 423 424 put_float(pb, cb->min); 425 put_float(pb, cb->delta); 426 427 put_bits(pb, 4, bits - 1); 428 put_bits(pb, 1, cb->seq_p); 429 430 for (i = 0; i < tmp; i++) 431 put_bits(pb, bits, cb->quantlist[i]); 432 } 433} 434 435static void put_floor_header(PutBitContext * pb, vorbis_enc_floor * fc) { 436 int i; 437 438 put_bits(pb, 16, 1); // type, only floor1 is supported 439 440 put_bits(pb, 5, fc->partitions); 441 442 for (i = 0; i < fc->partitions; i++) 443 put_bits(pb, 4, fc->partition_to_class[i]); 444 445 for (i = 0; i < fc->nclasses; i++) { 446 int j, books; 447 448 put_bits(pb, 3, fc->classes[i].dim - 1); 449 put_bits(pb, 2, fc->classes[i].subclass); 450 451 if (fc->classes[i].subclass) 452 put_bits(pb, 8, fc->classes[i].masterbook); 453 454 books = (1 << fc->classes[i].subclass); 455 456 for (j = 0; j < books; j++) 457 put_bits(pb, 8, fc->classes[i].books[j] + 1); 458 } 459 460 put_bits(pb, 2, fc->multiplier - 1); 461 put_bits(pb, 4, fc->rangebits); 462 463 for (i = 2; i < fc->values; i++) 464 put_bits(pb, fc->rangebits, fc->list[i].x); 465} 466 467static void put_residue_header(PutBitContext * pb, vorbis_enc_residue * rc) { 468 int i; 469 470 put_bits(pb, 16, rc->type); 471 472 put_bits(pb, 24, rc->begin); 473 put_bits(pb, 24, rc->end); 474 put_bits(pb, 24, rc->partition_size - 1); 475 put_bits(pb, 6, rc->classifications - 1); 476 put_bits(pb, 8, rc->classbook); 477 478 for (i = 0; i < rc->classifications; i++) { 479 int j, tmp = 0; 480 for (j = 0; j < 8; j++) 481 tmp |= (rc->books[i][j] != -1) << j; 482 483 put_bits(pb, 3, tmp & 7); 484 put_bits(pb, 1, tmp > 7); 485 486 if (tmp > 7) 487 put_bits(pb, 5, tmp >> 3); 488 } 489 490 for (i = 0; i < rc->classifications; i++) { 491 int j; 492 for (j = 0; j < 8; j++) 493 if (rc->books[i][j] != -1) 494 put_bits(pb, 8, rc->books[i][j]); 495 } 496} 497 498static int put_main_header(vorbis_enc_context * venc, uint8_t ** out) { 499 int i; 500 PutBitContext pb; 501 uint8_t buffer[50000] = {0}, * p = buffer; 502 int buffer_len = sizeof buffer; 503 int len, hlens[3]; 504 505 // identification header 506 init_put_bits(&pb, p, buffer_len); 507 put_bits(&pb, 8, 1); //magic 508 for (i = 0; "vorbis"[i]; i++) 509 put_bits(&pb, 8, "vorbis"[i]); 510 put_bits(&pb, 32, 0); // version 511 put_bits(&pb, 8, venc->channels); 512 put_bits(&pb, 32, venc->sample_rate); 513 put_bits(&pb, 32, 0); // bitrate 514 put_bits(&pb, 32, 0); // bitrate 515 put_bits(&pb, 32, 0); // bitrate 516 put_bits(&pb, 4, venc->log2_blocksize[0]); 517 put_bits(&pb, 4, venc->log2_blocksize[1]); 518 put_bits(&pb, 1, 1); // framing 519 520 flush_put_bits(&pb); 521 hlens[0] = (put_bits_count(&pb) + 7) / 8; 522 buffer_len -= hlens[0]; 523 p += hlens[0]; 524 525 // comment header 526 init_put_bits(&pb, p, buffer_len); 527 put_bits(&pb, 8, 3); //magic 528 for (i = 0; "vorbis"[i]; i++) 529 put_bits(&pb, 8, "vorbis"[i]); 530 put_bits(&pb, 32, 0); // vendor length TODO 531 put_bits(&pb, 32, 0); // amount of comments 532 put_bits(&pb, 1, 1); // framing 533 534 flush_put_bits(&pb); 535 hlens[1] = (put_bits_count(&pb) + 7) / 8; 536 buffer_len -= hlens[1]; 537 p += hlens[1]; 538 539 // setup header 540 init_put_bits(&pb, p, buffer_len); 541 put_bits(&pb, 8, 5); //magic 542 for (i = 0; "vorbis"[i]; i++) 543 put_bits(&pb, 8, "vorbis"[i]); 544 545 // codebooks 546 put_bits(&pb, 8, venc->ncodebooks - 1); 547 for (i = 0; i < venc->ncodebooks; i++) 548 put_codebook_header(&pb, &venc->codebooks[i]); 549 550 // time domain, reserved, zero 551 put_bits(&pb, 6, 0); 552 put_bits(&pb, 16, 0); 553 554 // floors 555 put_bits(&pb, 6, venc->nfloors - 1); 556 for (i = 0; i < venc->nfloors; i++) 557 put_floor_header(&pb, &venc->floors[i]); 558 559 // residues 560 put_bits(&pb, 6, venc->nresidues - 1); 561 for (i = 0; i < venc->nresidues; i++) 562 put_residue_header(&pb, &venc->residues[i]); 563 564 // mappings 565 put_bits(&pb, 6, venc->nmappings - 1); 566 for (i = 0; i < venc->nmappings; i++) { 567 vorbis_enc_mapping * mc = &venc->mappings[i]; 568 int j; 569 put_bits(&pb, 16, 0); // mapping type 570 571 put_bits(&pb, 1, mc->submaps > 1); 572 if (mc->submaps > 1) 573 put_bits(&pb, 4, mc->submaps - 1); 574 575 put_bits(&pb, 1, !!mc->coupling_steps); 576 if (mc->coupling_steps) { 577 put_bits(&pb, 8, mc->coupling_steps - 1); 578 for (j = 0; j < mc->coupling_steps; j++) { 579 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]); 580 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]); 581 } 582 } 583 584 put_bits(&pb, 2, 0); // reserved 585 586 if (mc->submaps > 1) 587 for (j = 0; j < venc->channels; j++) 588 put_bits(&pb, 4, mc->mux[j]); 589 590 for (j = 0; j < mc->submaps; j++) { 591 put_bits(&pb, 8, 0); // reserved time configuration 592 put_bits(&pb, 8, mc->floor[j]); 593 put_bits(&pb, 8, mc->residue[j]); 594 } 595 } 596 597 // modes 598 put_bits(&pb, 6, venc->nmodes - 1); 599 for (i = 0; i < venc->nmodes; i++) { 600 put_bits(&pb, 1, venc->modes[i].blockflag); 601 put_bits(&pb, 16, 0); // reserved window type 602 put_bits(&pb, 16, 0); // reserved transform type 603 put_bits(&pb, 8, venc->modes[i].mapping); 604 } 605 606 put_bits(&pb, 1, 1); // framing 607 608 flush_put_bits(&pb); 609 hlens[2] = (put_bits_count(&pb) + 7) / 8; 610 611 len = hlens[0] + hlens[1] + hlens[2]; 612 p = *out = av_mallocz(64 + len + len/255); 613 614 *p++ = 2; 615 p += av_xiphlacing(p, hlens[0]); 616 p += av_xiphlacing(p, hlens[1]); 617 buffer_len = 0; 618 for (i = 0; i < 3; i++) { 619 memcpy(p, buffer + buffer_len, hlens[i]); 620 p += hlens[i]; 621 buffer_len += hlens[i]; 622 } 623 624 return p - *out; 625} 626 627static float get_floor_average(vorbis_enc_floor * fc, float * coeffs, int i) { 628 int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x; 629 int end = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x; 630 int j; 631 float average = 0; 632 633 for (j = begin; j < end; j++) 634 average += fabs(coeffs[j]); 635 return average / (end - begin); 636} 637 638static void floor_fit(vorbis_enc_context * venc, vorbis_enc_floor * fc, float * coeffs, uint_fast16_t * posts, int samples) { 639 int range = 255 / fc->multiplier + 1; 640 int i; 641 float tot_average = 0.; 642 float averages[fc->values]; 643 for (i = 0; i < fc->values; i++){ 644 averages[i] = get_floor_average(fc, coeffs, i); 645 tot_average += averages[i]; 646 } 647 tot_average /= fc->values; 648 tot_average /= venc->quality; 649 650 for (i = 0; i < fc->values; i++) { 651 int position = fc->list[fc->list[i].sort].x; 652 float average = averages[i]; 653 int j; 654 655 average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC! 656 for (j = 0; j < range - 1; j++) 657 if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average) break; 658 posts[fc->list[i].sort] = j; 659 } 660} 661 662static int render_point(int x0, int y0, int x1, int y1, int x) { 663 return y0 + (x - x0) * (y1 - y0) / (x1 - x0); 664} 665 666static void floor_encode(vorbis_enc_context * venc, vorbis_enc_floor * fc, PutBitContext * pb, uint_fast16_t * posts, float * floor, int samples) { 667 int range = 255 / fc->multiplier + 1; 668 int coded[fc->values]; // first 2 values are unused 669 int i, counter; 670 671 put_bits(pb, 1, 1); // non zero 672 put_bits(pb, ilog(range - 1), posts[0]); 673 put_bits(pb, ilog(range - 1), posts[1]); 674 coded[0] = coded[1] = 1; 675 676 for (i = 2; i < fc->values; i++) { 677 int predicted = render_point(fc->list[fc->list[i].low].x, 678 posts[fc->list[i].low], 679 fc->list[fc->list[i].high].x, 680 posts[fc->list[i].high], 681 fc->list[i].x); 682 int highroom = range - predicted; 683 int lowroom = predicted; 684 int room = FFMIN(highroom, lowroom); 685 if (predicted == posts[i]) { 686 coded[i] = 0; // must be used later as flag! 687 continue; 688 } else { 689 if (!coded[fc->list[i].low ]) coded[fc->list[i].low ] = -1; 690 if (!coded[fc->list[i].high]) coded[fc->list[i].high] = -1; 691 } 692 if (posts[i] > predicted) { 693 if (posts[i] - predicted > room) 694 coded[i] = posts[i] - predicted + lowroom; 695 else 696 coded[i] = (posts[i] - predicted) << 1; 697 } else { 698 if (predicted - posts[i] > room) 699 coded[i] = predicted - posts[i] + highroom - 1; 700 else 701 coded[i] = ((predicted - posts[i]) << 1) - 1; 702 } 703 } 704 705 counter = 2; 706 for (i = 0; i < fc->partitions; i++) { 707 vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]]; 708 int k, cval = 0, csub = 1<<c->subclass; 709 if (c->subclass) { 710 vorbis_enc_codebook * book = &venc->codebooks[c->masterbook]; 711 int cshift = 0; 712 for (k = 0; k < c->dim; k++) { 713 int l; 714 for (l = 0; l < csub; l++) { 715 int maxval = 1; 716 if (c->books[l] != -1) 717 maxval = venc->codebooks[c->books[l]].nentries; 718 // coded could be -1, but this still works, cause that is 0 719 if (coded[counter + k] < maxval) break; 720 } 721 assert(l != csub); 722 cval |= l << cshift; 723 cshift += c->subclass; 724 } 725 put_codeword(pb, book, cval); 726 } 727 for (k = 0; k < c->dim; k++) { 728 int book = c->books[cval & (csub-1)]; 729 int entry = coded[counter++]; 730 cval >>= c->subclass; 731 if (book == -1) continue; 732 if (entry == -1) entry = 0; 733 put_codeword(pb, &venc->codebooks[book], entry); 734 } 735 } 736 737 ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded, fc->multiplier, floor, samples); 738} 739 740static float * put_vector(vorbis_enc_codebook * book, PutBitContext * pb, float * num) { 741 int i, entry = -1; 742 float distance = FLT_MAX; 743 assert(book->dimentions); 744 for (i = 0; i < book->nentries; i++) { 745 float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i]; 746 int j; 747 if (!book->lens[i]) continue; 748 for (j = 0; j < book->ndimentions; j++) 749 d -= vec[j] * num[j]; 750 if (distance > d) { 751 entry = i; 752 distance = d; 753 } 754 } 755 put_codeword(pb, book, entry); 756 return &book->dimentions[entry * book->ndimentions]; 757} 758 759static void residue_encode(vorbis_enc_context * venc, vorbis_enc_residue * rc, PutBitContext * pb, float * coeffs, int samples, int real_ch) { 760 int pass, i, j, p, k; 761 int psize = rc->partition_size; 762 int partitions = (rc->end - rc->begin) / psize; 763 int channels = (rc->type == 2) ? 1 : real_ch; 764 int classes[channels][partitions]; 765 int classwords = venc->codebooks[rc->classbook].ndimentions; 766 767 assert(rc->type == 2); 768 assert(real_ch == 2); 769 for (p = 0; p < partitions; p++) { 770 float max1 = 0., max2 = 0.; 771 int s = rc->begin + p * psize; 772 for (k = s; k < s + psize; k += 2) { 773 max1 = FFMAX(max1, fabs(coeffs[ k / real_ch])); 774 max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch])); 775 } 776 777 for (i = 0; i < rc->classifications - 1; i++) { 778 if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1]) break; 779 } 780 classes[0][p] = i; 781 } 782 783 for (pass = 0; pass < 8; pass++) { 784 p = 0; 785 while (p < partitions) { 786 if (pass == 0) 787 for (j = 0; j < channels; j++) { 788 vorbis_enc_codebook * book = &venc->codebooks[rc->classbook]; 789 int entry = 0; 790 for (i = 0; i < classwords; i++) { 791 entry *= rc->classifications; 792 entry += classes[j][p + i]; 793 } 794 put_codeword(pb, book, entry); 795 } 796 for (i = 0; i < classwords && p < partitions; i++, p++) { 797 for (j = 0; j < channels; j++) { 798 int nbook = rc->books[classes[j][p]][pass]; 799 vorbis_enc_codebook * book = &venc->codebooks[nbook]; 800 float * buf = coeffs + samples*j + rc->begin + p*psize; 801 if (nbook == -1) continue; 802 803 assert(rc->type == 0 || rc->type == 2); 804 assert(!(psize % book->ndimentions)); 805 806 if (rc->type == 0) { 807 for (k = 0; k < psize; k += book->ndimentions) { 808 float * a = put_vector(book, pb, &buf[k]); 809 int l; 810 for (l = 0; l < book->ndimentions; l++) 811 buf[k + l] -= a[l]; 812 } 813 } else { 814 int s = rc->begin + p * psize, a1, b1; 815 a1 = (s % real_ch) * samples; 816 b1 = s / real_ch; 817 s = real_ch * samples; 818 for (k = 0; k < psize; k += book->ndimentions) { 819 int dim, a2 = a1, b2 = b1; 820 float vec[book->ndimentions], * pv = vec; 821 for (dim = book->ndimentions; dim--; ) { 822 *pv++ = coeffs[a2 + b2]; 823 if ((a2 += samples) == s) { 824 a2=0; 825 b2++; 826 } 827 } 828 pv = put_vector(book, pb, vec); 829 for (dim = book->ndimentions; dim--; ) { 830 coeffs[a1 + b1] -= *pv++; 831 if ((a1 += samples) == s) { 832 a1=0; 833 b1++; 834 } 835 } 836 } 837 } 838 } 839 } 840 } 841 } 842} 843 844static int apply_window_and_mdct(vorbis_enc_context * venc, signed short * audio, int samples) { 845 int i, j, channel; 846 const float * win = venc->win[0]; 847 int window_len = 1 << (venc->log2_blocksize[0] - 1); 848 float n = (float)(1 << venc->log2_blocksize[0]) / 4.; 849 // FIXME use dsp 850 851 if (!venc->have_saved && !samples) return 0; 852 853 if (venc->have_saved) { 854 for (channel = 0; channel < venc->channels; channel++) { 855 memcpy(venc->samples + channel*window_len*2, venc->saved + channel*window_len, sizeof(float)*window_len); 856 } 857 } else { 858 for (channel = 0; channel < venc->channels; channel++) { 859 memset(venc->samples + channel*window_len*2, 0, sizeof(float)*window_len); 860 } 861 } 862 863 if (samples) { 864 for (channel = 0; channel < venc->channels; channel++) { 865 float * offset = venc->samples + channel*window_len*2 + window_len; 866 j = channel; 867 for (i = 0; i < samples; i++, j += venc->channels) 868 offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped 869 } 870 } else { 871 for (channel = 0; channel < venc->channels; channel++) { 872 memset(venc->samples + channel*window_len*2 + window_len, 0, sizeof(float)*window_len); 873 } 874 } 875 876 for (channel = 0; channel < venc->channels; channel++) { 877 ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel*window_len, venc->samples + channel*window_len*2); 878 } 879 880 if (samples) { 881 for (channel = 0; channel < venc->channels; channel++) { 882 float * offset = venc->saved + channel*window_len; 883 j = channel; 884 for (i = 0; i < samples; i++, j += venc->channels) 885 offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped 886 } 887 venc->have_saved = 1; 888 } else { 889 venc->have_saved = 0; 890 } 891 return 1; 892} 893 894static av_cold int vorbis_encode_init(AVCodecContext * avccontext) 895{ 896 vorbis_enc_context * venc = avccontext->priv_data; 897 898 if (avccontext->channels != 2) { 899 av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n"); 900 return -1; 901 } 902 903 create_vorbis_context(venc, avccontext); 904 905 if (avccontext->flags & CODEC_FLAG_QSCALE) 906 venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.; 907 else 908 venc->quality = 1.; 909 venc->quality *= venc->quality; 910 911 avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata); 912 913 avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1); 914 915 avccontext->coded_frame = avcodec_alloc_frame(); 916 avccontext->coded_frame->key_frame = 1; 917 918 return 0; 919} 920 921static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * packets, int buf_size, void *data) 922{ 923 vorbis_enc_context * venc = avccontext->priv_data; 924 signed short * audio = data; 925 int samples = data ? avccontext->frame_size : 0; 926 vorbis_enc_mode * mode; 927 vorbis_enc_mapping * mapping; 928 PutBitContext pb; 929 int i; 930 931 if (!apply_window_and_mdct(venc, audio, samples)) return 0; 932 samples = 1 << (venc->log2_blocksize[0] - 1); 933 934 init_put_bits(&pb, packets, buf_size); 935 936 put_bits(&pb, 1, 0); // magic bit 937 938 put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode 939 940 mode = &venc->modes[0]; 941 mapping = &venc->mappings[mode->mapping]; 942 if (mode->blockflag) { 943 put_bits(&pb, 1, 0); 944 put_bits(&pb, 1, 0); 945 } 946 947 for (i = 0; i < venc->channels; i++) { 948 vorbis_enc_floor * fc = &venc->floors[mapping->floor[mapping->mux[i]]]; 949 uint_fast16_t posts[fc->values]; 950 floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples); 951 floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples); 952 } 953 954 for (i = 0; i < venc->channels * samples; i++) { 955 venc->coeffs[i] /= venc->floor[i]; 956 } 957 958 for (i = 0; i < mapping->coupling_steps; i++) { 959 float * mag = venc->coeffs + mapping->magnitude[i] * samples; 960 float * ang = venc->coeffs + mapping->angle[i] * samples; 961 int j; 962 for (j = 0; j < samples; j++) { 963 float a = ang[j]; 964 ang[j] -= mag[j]; 965 if (mag[j] > 0) ang[j] = -ang[j]; 966 if (ang[j] < 0) mag[j] = a; 967 } 968 } 969 970 residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], &pb, venc->coeffs, samples, venc->channels); 971 972 avccontext->coded_frame->pts = venc->sample_count; 973 venc->sample_count += avccontext->frame_size; 974 flush_put_bits(&pb); 975 return (put_bits_count(&pb) + 7) / 8; 976} 977 978 979static av_cold int vorbis_encode_close(AVCodecContext * avccontext) 980{ 981 vorbis_enc_context * venc = avccontext->priv_data; 982 int i; 983 984 if (venc->codebooks) 985 for (i = 0; i < venc->ncodebooks; i++) { 986 av_freep(&venc->codebooks[i].lens); 987 av_freep(&venc->codebooks[i].codewords); 988 av_freep(&venc->codebooks[i].quantlist); 989 av_freep(&venc->codebooks[i].dimentions); 990 av_freep(&venc->codebooks[i].pow2); 991 } 992 av_freep(&venc->codebooks); 993 994 if (venc->floors) 995 for (i = 0; i < venc->nfloors; i++) { 996 int j; 997 if (venc->floors[i].classes) 998 for (j = 0; j < venc->floors[i].nclasses; j++) 999 av_freep(&venc->floors[i].classes[j].books); 1000 av_freep(&venc->floors[i].classes); 1001 av_freep(&venc->floors[i].partition_to_class); 1002 av_freep(&venc->floors[i].list); 1003 } 1004 av_freep(&venc->floors); 1005 1006 if (venc->residues) 1007 for (i = 0; i < venc->nresidues; i++) { 1008 av_freep(&venc->residues[i].books); 1009 av_freep(&venc->residues[i].maxes); 1010 } 1011 av_freep(&venc->residues); 1012 1013 if (venc->mappings) 1014 for (i = 0; i < venc->nmappings; i++) { 1015 av_freep(&venc->mappings[i].mux); 1016 av_freep(&venc->mappings[i].floor); 1017 av_freep(&venc->mappings[i].residue); 1018 av_freep(&venc->mappings[i].magnitude); 1019 av_freep(&venc->mappings[i].angle); 1020 } 1021 av_freep(&venc->mappings); 1022 1023 av_freep(&venc->modes); 1024 1025 av_freep(&venc->saved); 1026 av_freep(&venc->samples); 1027 av_freep(&venc->floor); 1028 av_freep(&venc->coeffs); 1029 1030 ff_mdct_end(&venc->mdct[0]); 1031 ff_mdct_end(&venc->mdct[1]); 1032 1033 av_freep(&avccontext->coded_frame); 1034 av_freep(&avccontext->extradata); 1035 1036 return 0 ; 1037} 1038 1039AVCodec vorbis_encoder = { 1040 "vorbis", 1041 CODEC_TYPE_AUDIO, 1042 CODEC_ID_VORBIS, 1043 sizeof(vorbis_enc_context), 1044 vorbis_encode_init, 1045 vorbis_encode_frame, 1046 vorbis_encode_close, 1047 .capabilities= CODEC_CAP_DELAY, 1048 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, 1049 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"), 1050}; 1051