libavcodec/vorbis_enc.c

   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 "put_bits.h"
  35
  36 #undef NDEBUG
  37 #include <assert.h>
  38
  39 typedef 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
  53 typedef struct {
  54     int dim;
  55     int subclass;
  56     int masterbook;
  57     int *books;
  58 } vorbis_enc_floor_class;
  59
  60 typedef 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
  71 typedef 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
  82 typedef 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
  92 typedef struct {
  93     int blockflag;
  94     int mapping;
  95 } vorbis_enc_mode;
  96
  97 typedef struct {
  98     int channels;
  99     int sample_rate;
 100     int log2_blocksize[2];
 101     FFTContext 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
 128 static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
 129                                 int entry)
 130 {
 131     assert(entry >= 0);
 132     assert(entry < cb->nentries);
 133     assert(cb->lens[entry]);
 134     put_bits(pb, cb->lens[entry], cb->codewords[entry]);
 135 }
 136
 137 static int cb_lookup_vals(int lookup, int dimentions, int entries)
 138 {
 139     if (lookup == 1)
 140         return ff_vorbis_nth_root(entries, dimentions);
 141     else if (lookup == 2)
 142         return dimentions *entries;
 143     return 0;
 144 }
 145
 146 static void ready_codebook(vorbis_enc_codebook *cb)
 147 {
 148     int i;
 149
 150     ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
 151
 152     if (!cb->lookup) {
 153         cb->pow2 = cb->dimentions = NULL;
 154     } else {
 155         int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
 156         cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
 157         cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
 158         for (i = 0; i < cb->nentries; i++) {
 159             float last = 0;
 160             int j;
 161             int div = 1;
 162             for (j = 0; j < cb->ndimentions; j++) {
 163                 int off;
 164                 if (cb->lookup == 1)
 165                     off = (i / div) % vals; // lookup type 1
 166                 else
 167                     off = i * cb->ndimentions + j; // lookup type 2
 168
 169                 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
 170                 if (cb->seq_p)
 171                     last = cb->dimentions[i * cb->ndimentions + j];
 172                 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
 173                 div *= vals;
 174             }
 175             cb->pow2[i] /= 2.;
 176         }
 177     }
 178 }
 179
 180 static void ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
 181 {
 182     int i;
 183     assert(rc->type == 2);
 184     rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
 185     for (i = 0; i < rc->classifications; i++) {
 186         int j;
 187         vorbis_enc_codebook * cb;
 188         for (j = 0; j < 8; j++)
 189             if (rc->books[i][j] != -1)
 190                 break;
 191         if (j == 8) // zero
 192             continue;
 193         cb = &venc->codebooks[rc->books[i][j]];
 194         assert(cb->ndimentions >= 2);
 195         assert(cb->lookup);
 196
 197         for (j = 0; j < cb->nentries; j++) {
 198             float a;
 199             if (!cb->lens[j])
 200                 continue;
 201             a = fabs(cb->dimentions[j * cb->ndimentions]);
 202             if (a > rc->maxes[i][0])
 203                 rc->maxes[i][0] = a;
 204             a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
 205             if (a > rc->maxes[i][1])
 206                 rc->maxes[i][1] = a;
 207         }
 208     }
 209     // small bias
 210     for (i = 0; i < rc->classifications; i++) {
 211         rc->maxes[i][0] += 0.8;
 212         rc->maxes[i][1] += 0.8;
 213     }
 214 }
 215
 216 static void create_vorbis_context(vorbis_enc_context *venc,
 217                                   AVCodecContext *avccontext)
 218 {
 219     vorbis_enc_floor   *fc;
 220     vorbis_enc_residue *rc;
 221     vorbis_enc_mapping *mc;
 222     int i, book;
 223
 224     venc->channels    = avccontext->channels;
 225     venc->sample_rate = avccontext->sample_rate;
 226     venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
 227
 228     venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
 229     venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
 230
 231     // codebook 0..14 - floor1 book, values 0..255
 232     // codebook 15 residue masterbook
 233     // codebook 16..29 residue
 234     for (book = 0; book < venc->ncodebooks; book++) {
 235         vorbis_enc_codebook *cb = &venc->codebooks[book];
 236         int vals;
 237         cb->ndimentions = cvectors[book].dim;
 238         cb->nentries    = cvectors[book].real_len;
 239         cb->min         = cvectors[book].min;
 240         cb->delta       = cvectors[book].delta;
 241         cb->lookup      = cvectors[book].lookup;
 242         cb->seq_p       = 0;
 243
 244         cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
 245         cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
 246         memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
 247         memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
 248
 249         if (cb->lookup) {
 250             vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
 251             cb->quantlist = av_malloc(sizeof(int) * vals);
 252             for (i = 0; i < vals; i++)
 253                 cb->quantlist[i] = cvectors[book].quant[i];
 254         } else {
 255             cb->quantlist = NULL;
 256         }
 257         ready_codebook(cb);
 258     }
 259
 260     venc->nfloors = 1;
 261     venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
 262
 263     // just 1 floor
 264     fc = &venc->floors[0];
 265     fc->partitions         = 8;
 266     fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
 267     fc->nclasses           = 0;
 268     for (i = 0; i < fc->partitions; i++) {
 269         static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
 270         fc->partition_to_class[i] = a[i];
 271         fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
 272     }
 273     fc->nclasses++;
 274     fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
 275     for (i = 0; i < fc->nclasses; i++) {
 276         vorbis_enc_floor_class * c = &fc->classes[i];
 277         int j, books;
 278         c->dim        = floor_classes[i].dim;
 279         c->subclass   = floor_classes[i].subclass;
 280         c->masterbook = floor_classes[i].masterbook;
 281         books         = (1 << c->subclass);
 282         c->books      = av_malloc(sizeof(int) * books);
 283         for (j = 0; j < books; j++)
 284             c->books[j] = floor_classes[i].nbooks[j];
 285     }
 286     fc->multiplier = 2;
 287     fc->rangebits  = venc->log2_blocksize[0] - 1;
 288
 289     fc->values = 2;
 290     for (i = 0; i < fc->partitions; i++)
 291         fc->values += fc->classes[fc->partition_to_class[i]].dim;
 292
 293     fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
 294     fc->list[0].x = 0;
 295     fc->list[1].x = 1 << fc->rangebits;
 296     for (i = 2; i < fc->values; i++) {
 297         static const int a[] = {
 298              93, 23,372,  6, 46,186,750, 14, 33, 65,
 299             130,260,556,  3, 10, 18, 28, 39, 55, 79,
 300             111,158,220,312,464,650,850
 301         };
 302         fc->list[i].x = a[i - 2];
 303     }
 304     ff_vorbis_ready_floor1_list(fc->list, fc->values);
 305
 306     venc->nresidues = 1;
 307     venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
 308
 309     // single residue
 310     rc = &venc->residues[0];
 311     rc->type            = 2;
 312     rc->begin           = 0;
 313     rc->end             = 1600;
 314     rc->partition_size  = 32;
 315     rc->classifications = 10;
 316     rc->classbook       = 15;
 317     rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
 318     {
 319         static const int8_t a[10][8] = {
 320             { -1, -1, -1, -1, -1, -1, -1, -1, },
 321             { -1, -1, 16, -1, -1, -1, -1, -1, },
 322             { -1, -1, 17, -1, -1, -1, -1, -1, },
 323             { -1, -1, 18, -1, -1, -1, -1, -1, },
 324             { -1, -1, 19, -1, -1, -1, -1, -1, },
 325             { -1, -1, 20, -1, -1, -1, -1, -1, },
 326             { -1, -1, 21, -1, -1, -1, -1, -1, },
 327             { 22, 23, -1, -1, -1, -1, -1, -1, },
 328             { 24, 25, -1, -1, -1, -1, -1, -1, },
 329             { 26, 27, 28, -1, -1, -1, -1, -1, },
 330         };
 331         memcpy(rc->books, a, sizeof a);
 332     }
 333     ready_residue(rc, venc);
 334
 335     venc->nmappings = 1;
 336     venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
 337
 338     // single mapping
 339     mc = &venc->mappings[0];
 340     mc->submaps = 1;
 341     mc->mux     = av_malloc(sizeof(int) * venc->channels);
 342     for (i = 0; i < venc->channels; i++)
 343         mc->mux[i] = 0;
 344     mc->floor   = av_malloc(sizeof(int) * mc->submaps);
 345     mc->residue = av_malloc(sizeof(int) * mc->submaps);
 346     for (i = 0; i < mc->submaps; i++) {
 347         mc->floor[i]   = 0;
 348         mc->residue[i] = 0;
 349     }
 350     mc->coupling_steps = venc->channels == 2 ? 1 : 0;
 351     mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
 352     mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
 353     if (mc->coupling_steps) {
 354         mc->magnitude[0] = 0;
 355         mc->angle[0]     = 1;
 356     }
 357
 358     venc->nmodes = 1;
 359     venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
 360
 361     // single mode
 362     venc->modes[0].blockflag = 0;
 363     venc->modes[0].mapping   = 0;
 364
 365     venc->have_saved = 0;
 366     venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 367     venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
 368     venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 369     venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 370
 371     venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
 372     venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
 373
 374     ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0);
 375     ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0);
 376 }
 377
 378 static void put_float(PutBitContext *pb, float f)
 379 {
 380     int exp, mant;
 381     uint32_t res = 0;
 382     mant = (int)ldexp(frexp(f, &exp), 20);
 383     exp += 788 - 20;
 384     if (mant < 0) {
 385         res |= (1 << 31);
 386         mant = -mant;
 387     }
 388     res |= mant | (exp << 21);
 389     put_bits32(pb, res);
 390 }
 391
 392 static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
 393 {
 394     int i;
 395     int ordered = 0;
 396
 397     put_bits(pb, 24, 0x564342); //magic
 398     put_bits(pb, 16, cb->ndimentions);
 399     put_bits(pb, 24, cb->nentries);
 400
 401     for (i = 1; i < cb->nentries; i++)
 402         if (cb->lens[i] < cb->lens[i-1])
 403             break;
 404     if (i == cb->nentries)
 405         ordered = 1;
 406
 407     put_bits(pb, 1, ordered);
 408     if (ordered) {
 409         int len = cb->lens[0];
 410         put_bits(pb, 5, len - 1);
 411         i = 0;
 412         while (i < cb->nentries) {
 413             int j;
 414             for (j = 0; j+i < cb->nentries; j++)
 415                 if (cb->lens[j+i] != len)
 416                     break;
 417             put_bits(pb, ilog(cb->nentries - i), j);
 418             i += j;
 419             len++;
 420         }
 421     } else {
 422         int sparse = 0;
 423         for (i = 0; i < cb->nentries; i++)
 424             if (!cb->lens[i])
 425                 break;
 426         if (i != cb->nentries)
 427             sparse = 1;
 428         put_bits(pb, 1, sparse);
 429
 430         for (i = 0; i < cb->nentries; i++) {
 431             if (sparse)
 432                 put_bits(pb, 1, !!cb->lens[i]);
 433             if (cb->lens[i])
 434                 put_bits(pb, 5, cb->lens[i] - 1);
 435         }
 436     }
 437
 438     put_bits(pb, 4, cb->lookup);
 439     if (cb->lookup) {
 440         int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
 441         int bits = ilog(cb->quantlist[0]);
 442
 443         for (i = 1; i < tmp; i++)
 444             bits = FFMAX(bits, ilog(cb->quantlist[i]));
 445
 446         put_float(pb, cb->min);
 447         put_float(pb, cb->delta);
 448
 449         put_bits(pb, 4, bits - 1);
 450         put_bits(pb, 1, cb->seq_p);
 451
 452         for (i = 0; i < tmp; i++)
 453             put_bits(pb, bits, cb->quantlist[i]);
 454     }
 455 }
 456
 457 static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
 458 {
 459     int i;
 460
 461     put_bits(pb, 16, 1); // type, only floor1 is supported
 462
 463     put_bits(pb, 5, fc->partitions);
 464
 465     for (i = 0; i < fc->partitions; i++)
 466         put_bits(pb, 4, fc->partition_to_class[i]);
 467
 468     for (i = 0; i < fc->nclasses; i++) {
 469         int j, books;
 470
 471         put_bits(pb, 3, fc->classes[i].dim - 1);
 472         put_bits(pb, 2, fc->classes[i].subclass);
 473
 474         if (fc->classes[i].subclass)
 475             put_bits(pb, 8, fc->classes[i].masterbook);
 476
 477         books = (1 << fc->classes[i].subclass);
 478
 479         for (j = 0; j < books; j++)
 480             put_bits(pb, 8, fc->classes[i].books[j] + 1);
 481     }
 482
 483     put_bits(pb, 2, fc->multiplier - 1);
 484     put_bits(pb, 4, fc->rangebits);
 485
 486     for (i = 2; i < fc->values; i++)
 487         put_bits(pb, fc->rangebits, fc->list[i].x);
 488 }
 489
 490 static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
 491 {
 492     int i;
 493
 494     put_bits(pb, 16, rc->type);
 495
 496     put_bits(pb, 24, rc->begin);
 497     put_bits(pb, 24, rc->end);
 498     put_bits(pb, 24, rc->partition_size - 1);
 499     put_bits(pb, 6, rc->classifications - 1);
 500     put_bits(pb, 8, rc->classbook);
 501
 502     for (i = 0; i < rc->classifications; i++) {
 503         int j, tmp = 0;
 504         for (j = 0; j < 8; j++)
 505             tmp |= (rc->books[i][j] != -1) << j;
 506
 507         put_bits(pb, 3, tmp & 7);
 508         put_bits(pb, 1, tmp > 7);
 509
 510         if (tmp > 7)
 511             put_bits(pb, 5, tmp >> 3);
 512     }
 513
 514     for (i = 0; i < rc->classifications; i++) {
 515         int j;
 516         for (j = 0; j < 8; j++)
 517             if (rc->books[i][j] != -1)
 518                 put_bits(pb, 8, rc->books[i][j]);
 519     }
 520 }
 521
 522 static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
 523 {
 524     int i;
 525     PutBitContext pb;
 526     uint8_t buffer[50000] = {0}, *p = buffer;
 527     int buffer_len = sizeof buffer;
 528     int len, hlens[3];
 529
 530     // identification header
 531     init_put_bits(&pb, p, buffer_len);
 532     put_bits(&pb, 8, 1); //magic
 533     ff_put_string(&pb, "vorbis", 0);
 534     put_bits32(&pb, 0); // version
 535     put_bits(&pb,  8, venc->channels);
 536     put_bits32(&pb, venc->sample_rate);
 537     put_bits32(&pb, 0); // bitrate
 538     put_bits32(&pb, 0); // bitrate
 539     put_bits32(&pb, 0); // bitrate
 540     put_bits(&pb,  4, venc->log2_blocksize[0]);
 541     put_bits(&pb,  4, venc->log2_blocksize[1]);
 542     put_bits(&pb,  1, 1); // framing
 543
 544     flush_put_bits(&pb);
 545     hlens[0] = put_bits_count(&pb) >> 3;
 546     buffer_len -= hlens[0];
 547     p += hlens[0];
 548
 549     // comment header
 550     init_put_bits(&pb, p, buffer_len);
 551     put_bits(&pb, 8, 3); //magic
 552     ff_put_string(&pb, "vorbis", 0);
 553     put_bits32(&pb, 0); // vendor length TODO
 554     put_bits32(&pb, 0); // amount of comments
 555     put_bits(&pb,  1, 1); // framing
 556
 557     flush_put_bits(&pb);
 558     hlens[1] = put_bits_count(&pb) >> 3;
 559     buffer_len -= hlens[1];
 560     p += hlens[1];
 561
 562     // setup header
 563     init_put_bits(&pb, p, buffer_len);
 564     put_bits(&pb, 8, 5); //magic
 565     ff_put_string(&pb, "vorbis", 0);
 566
 567     // codebooks
 568     put_bits(&pb, 8, venc->ncodebooks - 1);
 569     for (i = 0; i < venc->ncodebooks; i++)
 570         put_codebook_header(&pb, &venc->codebooks[i]);
 571
 572     // time domain, reserved, zero
 573     put_bits(&pb,  6, 0);
 574     put_bits(&pb, 16, 0);
 575
 576     // floors
 577     put_bits(&pb, 6, venc->nfloors - 1);
 578     for (i = 0; i < venc->nfloors; i++)
 579         put_floor_header(&pb, &venc->floors[i]);
 580
 581     // residues
 582     put_bits(&pb, 6, venc->nresidues - 1);
 583     for (i = 0; i < venc->nresidues; i++)
 584         put_residue_header(&pb, &venc->residues[i]);
 585
 586     // mappings
 587     put_bits(&pb, 6, venc->nmappings - 1);
 588     for (i = 0; i < venc->nmappings; i++) {
 589         vorbis_enc_mapping *mc = &venc->mappings[i];
 590         int j;
 591         put_bits(&pb, 16, 0); // mapping type
 592
 593         put_bits(&pb, 1, mc->submaps > 1);
 594         if (mc->submaps > 1)
 595             put_bits(&pb, 4, mc->submaps - 1);
 596
 597         put_bits(&pb, 1, !!mc->coupling_steps);
 598         if (mc->coupling_steps) {
 599             put_bits(&pb, 8, mc->coupling_steps - 1);
 600             for (j = 0; j < mc->coupling_steps; j++) {
 601                 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
 602                 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
 603             }
 604         }
 605
 606         put_bits(&pb, 2, 0); // reserved
 607
 608         if (mc->submaps > 1)
 609             for (j = 0; j < venc->channels; j++)
 610                 put_bits(&pb, 4, mc->mux[j]);
 611
 612         for (j = 0; j < mc->submaps; j++) {
 613             put_bits(&pb, 8, 0); // reserved time configuration
 614             put_bits(&pb, 8, mc->floor[j]);
 615             put_bits(&pb, 8, mc->residue[j]);
 616         }
 617     }
 618
 619     // modes
 620     put_bits(&pb, 6, venc->nmodes - 1);
 621     for (i = 0; i < venc->nmodes; i++) {
 622         put_bits(&pb, 1, venc->modes[i].blockflag);
 623         put_bits(&pb, 16, 0); // reserved window type
 624         put_bits(&pb, 16, 0); // reserved transform type
 625         put_bits(&pb, 8, venc->modes[i].mapping);
 626     }
 627
 628     put_bits(&pb, 1, 1); // framing
 629
 630     flush_put_bits(&pb);
 631     hlens[2] = put_bits_count(&pb) >> 3;
 632
 633     len = hlens[0] + hlens[1] + hlens[2];
 634     p = *out = av_mallocz(64 + len + len/255);
 635
 636     *p++ = 2;
 637     p += av_xiphlacing(p, hlens[0]);
 638     p += av_xiphlacing(p, hlens[1]);
 639     buffer_len = 0;
 640     for (i = 0; i < 3; i++) {
 641         memcpy(p, buffer + buffer_len, hlens[i]);
 642         p += hlens[i];
 643         buffer_len += hlens[i];
 644     }
 645
 646     return p - *out;
 647 }
 648
 649 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
 650 {
 651     int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
 652     int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
 653     int j;
 654     float average = 0;
 655
 656     for (j = begin; j < end; j++)
 657         average += fabs(coeffs[j]);
 658     return average / (end - begin);
 659 }
 660
 661 static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
 662                       float *coeffs, uint_fast16_t *posts, int samples)
 663 {
 664     int range = 255 / fc->multiplier + 1;
 665     int i;
 666     float tot_average = 0.;
 667     float averages[fc->values];
 668     for (i = 0; i < fc->values; i++) {
 669         averages[i] = get_floor_average(fc, coeffs, i);
 670         tot_average += averages[i];
 671     }
 672     tot_average /= fc->values;
 673     tot_average /= venc->quality;
 674
 675     for (i = 0; i < fc->values; i++) {
 676         int position  = fc->list[fc->list[i].sort].x;
 677         float average = averages[i];
 678         int j;
 679
 680         average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC!
 681         for (j = 0; j < range - 1; j++)
 682             if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
 683                 break;
 684         posts[fc->list[i].sort] = j;
 685     }
 686 }
 687
 688 static int render_point(int x0, int y0, int x1, int y1, int x)
 689 {
 690     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
 691 }
 692
 693 static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
 694                          PutBitContext *pb, uint_fast16_t *posts,
 695                          float *floor, int samples)
 696 {
 697     int range = 255 / fc->multiplier + 1;
 698     int coded[fc->values]; // first 2 values are unused
 699     int i, counter;
 700
 701     put_bits(pb, 1, 1); // non zero
 702     put_bits(pb, ilog(range - 1), posts[0]);
 703     put_bits(pb, ilog(range - 1), posts[1]);
 704     coded[0] = coded[1] = 1;
 705
 706     for (i = 2; i < fc->values; i++) {
 707         int predicted = render_point(fc->list[fc->list[i].low].x,
 708                                      posts[fc->list[i].low],
 709                                      fc->list[fc->list[i].high].x,
 710                                      posts[fc->list[i].high],
 711                                      fc->list[i].x);
 712         int highroom = range - predicted;
 713         int lowroom = predicted;
 714         int room = FFMIN(highroom, lowroom);
 715         if (predicted == posts[i]) {
 716             coded[i] = 0; // must be used later as flag!
 717             continue;
 718         } else {
 719             if (!coded[fc->list[i].low ])
 720                 coded[fc->list[i].low ] = -1;
 721             if (!coded[fc->list[i].high])
 722                 coded[fc->list[i].high] = -1;
 723         }
 724         if (posts[i] > predicted) {
 725             if (posts[i] - predicted > room)
 726                 coded[i] = posts[i] - predicted + lowroom;
 727             else
 728                 coded[i] = (posts[i] - predicted) << 1;
 729         } else {
 730             if (predicted - posts[i] > room)
 731                 coded[i] = predicted - posts[i] + highroom - 1;
 732             else
 733                 coded[i] = ((predicted - posts[i]) << 1) - 1;
 734         }
 735     }
 736
 737     counter = 2;
 738     for (i = 0; i < fc->partitions; i++) {
 739         vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
 740         int k, cval = 0, csub = 1<<c->subclass;
 741         if (c->subclass) {
 742             vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
 743             int cshift = 0;
 744             for (k = 0; k < c->dim; k++) {
 745                 int l;
 746                 for (l = 0; l < csub; l++) {
 747                     int maxval = 1;
 748                     if (c->books[l] != -1)
 749                         maxval = venc->codebooks[c->books[l]].nentries;
 750                     // coded could be -1, but this still works, cause that is 0
 751                     if (coded[counter + k] < maxval)
 752                         break;
 753                 }
 754                 assert(l != csub);
 755                 cval   |= l << cshift;
 756                 cshift += c->subclass;
 757             }
 758             put_codeword(pb, book, cval);
 759         }
 760         for (k = 0; k < c->dim; k++) {
 761             int book  = c->books[cval & (csub-1)];
 762             int entry = coded[counter++];
 763             cval >>= c->subclass;
 764             if (book == -1)
 765                 continue;
 766             if (entry == -1)
 767                 entry = 0;
 768             put_codeword(pb, &venc->codebooks[book], entry);
 769         }
 770     }
 771
 772     ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
 773                                  fc->multiplier, floor, samples);
 774 }
 775
 776 static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
 777                          float *num)
 778 {
 779     int i, entry = -1;
 780     float distance = FLT_MAX;
 781     assert(book->dimentions);
 782     for (i = 0; i < book->nentries; i++) {
 783         float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
 784         int j;
 785         if (!book->lens[i])
 786             continue;
 787         for (j = 0; j < book->ndimentions; j++)
 788             d -= vec[j] * num[j];
 789         if (distance > d) {
 790             entry    = i;
 791             distance = d;
 792         }
 793     }
 794     put_codeword(pb, book, entry);
 795     return &book->dimentions[entry * book->ndimentions];
 796 }
 797
 798 static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
 799                            PutBitContext *pb, float *coeffs, int samples,
 800                            int real_ch)
 801 {
 802     int pass, i, j, p, k;
 803     int psize      = rc->partition_size;
 804     int partitions = (rc->end - rc->begin) / psize;
 805     int channels   = (rc->type == 2) ? 1 : real_ch;
 806     int classes[channels][partitions];
 807     int classwords = venc->codebooks[rc->classbook].ndimentions;
 808
 809     assert(rc->type == 2);
 810     assert(real_ch == 2);
 811     for (p = 0; p < partitions; p++) {
 812         float max1 = 0., max2 = 0.;
 813         int s = rc->begin + p * psize;
 814         for (k = s; k < s + psize; k += 2) {
 815             max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
 816             max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
 817         }
 818
 819         for (i = 0; i < rc->classifications - 1; i++)
 820             if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
 821                 break;
 822         classes[0][p] = i;
 823     }
 824
 825     for (pass = 0; pass < 8; pass++) {
 826         p = 0;
 827         while (p < partitions) {
 828             if (pass == 0)
 829                 for (j = 0; j < channels; j++) {
 830                     vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
 831                     int entry = 0;
 832                     for (i = 0; i < classwords; i++) {
 833                         entry *= rc->classifications;
 834                         entry += classes[j][p + i];
 835                     }
 836                     put_codeword(pb, book, entry);
 837                 }
 838             for (i = 0; i < classwords && p < partitions; i++, p++) {
 839                 for (j = 0; j < channels; j++) {
 840                     int nbook = rc->books[classes[j][p]][pass];
 841                     vorbis_enc_codebook * book = &venc->codebooks[nbook];
 842                     float *buf = coeffs + samples*j + rc->begin + p*psize;
 843                     if (nbook == -1)
 844                         continue;
 845
 846                     assert(rc->type == 0 || rc->type == 2);
 847                     assert(!(psize % book->ndimentions));
 848
 849                     if (rc->type == 0) {
 850                         for (k = 0; k < psize; k += book->ndimentions) {
 851                             float *a = put_vector(book, pb, &buf[k]);
 852                             int l;
 853                             for (l = 0; l < book->ndimentions; l++)
 854                                 buf[k + l] -= a[l];
 855                         }
 856                     } else {
 857                         int s = rc->begin + p * psize, a1, b1;
 858                         a1 = (s % real_ch) * samples;
 859                         b1 =  s / real_ch;
 860                         s  = real_ch * samples;
 861                         for (k = 0; k < psize; k += book->ndimentions) {
 862                             int dim, a2 = a1, b2 = b1;
 863                             float vec[book->ndimentions], *pv = vec;
 864                             for (dim = book->ndimentions; dim--; ) {
 865                                 *pv++ = coeffs[a2 + b2];
 866                                 if ((a2 += samples) == s) {
 867                                     a2 = 0;
 868                                     b2++;
 869                                 }
 870                             }
 871                             pv = put_vector(book, pb, vec);
 872                             for (dim = book->ndimentions; dim--; ) {
 873                                 coeffs[a1 + b1] -= *pv++;
 874                                 if ((a1 += samples) == s) {
 875                                     a1 = 0;
 876                                     b1++;
 877                                 }
 878                             }
 879                         }
 880                     }
 881                 }
 882             }
 883         }
 884     }
 885 }
 886
 887 static int apply_window_and_mdct(vorbis_enc_context *venc, signed short *audio,
 888                                  int samples)
 889 {
 890     int i, j, channel;
 891     const float * win = venc->win[0];
 892     int window_len = 1 << (venc->log2_blocksize[0] - 1);
 893     float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
 894     // FIXME use dsp
 895
 896     if (!venc->have_saved && !samples)
 897         return 0;
 898
 899     if (venc->have_saved) {
 900         for (channel = 0; channel < venc->channels; channel++)
 901             memcpy(venc->samples + channel * window_len * 2,
 902                    venc->saved + channel * window_len, sizeof(float) * window_len);
 903     } else {
 904         for (channel = 0; channel < venc->channels; channel++)
 905             memset(venc->samples + channel * window_len * 2, 0,
 906                    sizeof(float) * window_len);
 907     }
 908
 909     if (samples) {
 910         for (channel = 0; channel < venc->channels; channel++) {
 911             float * offset = venc->samples + channel*window_len*2 + window_len;
 912             j = channel;
 913             for (i = 0; i < samples; i++, j += venc->channels)
 914                 offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped
 915         }
 916     } else {
 917         for (channel = 0; channel < venc->channels; channel++)
 918             memset(venc->samples + channel * window_len * 2 + window_len,
 919                    0, sizeof(float) * window_len);
 920     }
 921
 922     for (channel = 0; channel < venc->channels; channel++)
 923         ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
 924                      venc->samples + channel * window_len * 2);
 925
 926     if (samples) {
 927         for (channel = 0; channel < venc->channels; channel++) {
 928             float *offset = venc->saved + channel * window_len;
 929             j = channel;
 930             for (i = 0; i < samples; i++, j += venc->channels)
 931                 offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped
 932         }
 933         venc->have_saved = 1;
 934     } else {
 935         venc->have_saved = 0;
 936     }
 937     return 1;
 938 }
 939
 940 static av_cold int vorbis_encode_init(AVCodecContext *avccontext)
 941 {
 942     vorbis_enc_context *venc = avccontext->priv_data;
 943
 944     if (avccontext->channels != 2) {
 945         av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
 946         return -1;
 947     }
 948
 949     create_vorbis_context(venc, avccontext);
 950
 951     if (avccontext->flags & CODEC_FLAG_QSCALE)
 952         venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
 953     else
 954         venc->quality = 1.;
 955     venc->quality *= venc->quality;
 956
 957     avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
 958
 959     avccontext->frame_size     = 1 << (venc->log2_blocksize[0] - 1);
 960
 961     avccontext->coded_frame            = avcodec_alloc_frame();
 962     avccontext->coded_frame->key_frame = 1;
 963
 964     return 0;
 965 }
 966
 967 static int vorbis_encode_frame(AVCodecContext *avccontext,
 968                                unsigned char *packets,
 969                                int buf_size, void *data)
 970 {
 971     vorbis_enc_context *venc = avccontext->priv_data;
 972     signed short *audio = data;
 973     int samples = data ? avccontext->frame_size : 0;
 974     vorbis_enc_mode *mode;
 975     vorbis_enc_mapping *mapping;
 976     PutBitContext pb;
 977     int i;
 978
 979     if (!apply_window_and_mdct(venc, audio, samples))
 980         return 0;
 981     samples = 1 << (venc->log2_blocksize[0] - 1);
 982
 983     init_put_bits(&pb, packets, buf_size);
 984
 985     put_bits(&pb, 1, 0); // magic bit
 986
 987     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
 988
 989     mode    = &venc->modes[0];
 990     mapping = &venc->mappings[mode->mapping];
 991     if (mode->blockflag) {
 992         put_bits(&pb, 1, 0);
 993         put_bits(&pb, 1, 0);
 994     }
 995
 996     for (i = 0; i < venc->channels; i++) {
 997         vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
 998         uint_fast16_t posts[fc->values];
 999         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
1000         floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
1001     }
1002
1003     for (i = 0; i < venc->channels * samples; i++)
1004         venc->coeffs[i] /= venc->floor[i];
1005
1006     for (i = 0; i < mapping->coupling_steps; i++) {
1007         float *mag = venc->coeffs + mapping->magnitude[i] * samples;
1008         float *ang = venc->coeffs + mapping->angle[i]     * samples;
1009         int j;
1010         for (j = 0; j < samples; j++) {
1011             float a = ang[j];
1012             ang[j] -= mag[j];
1013             if (mag[j] > 0)
1014                 ang[j] = -ang[j];
1015             if (ang[j] < 0)
1016                 mag[j] = a;
1017         }
1018     }
1019
1020     residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
1021                    &pb, venc->coeffs, samples, venc->channels);
1022
1023     avccontext->coded_frame->pts = venc->sample_count;
1024     venc->sample_count += avccontext->frame_size;
1025     flush_put_bits(&pb);
1026     return put_bits_count(&pb) >> 3;
1027 }
1028
1029
1030 static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
1031 {
1032     vorbis_enc_context *venc = avccontext->priv_data;
1033     int i;
1034
1035     if (venc->codebooks)
1036         for (i = 0; i < venc->ncodebooks; i++) {
1037             av_freep(&venc->codebooks[i].lens);
1038             av_freep(&venc->codebooks[i].codewords);
1039             av_freep(&venc->codebooks[i].quantlist);
1040             av_freep(&venc->codebooks[i].dimentions);
1041             av_freep(&venc->codebooks[i].pow2);
1042         }
1043     av_freep(&venc->codebooks);
1044
1045     if (venc->floors)
1046         for (i = 0; i < venc->nfloors; i++) {
1047             int j;
1048             if (venc->floors[i].classes)
1049                 for (j = 0; j < venc->floors[i].nclasses; j++)
1050                     av_freep(&venc->floors[i].classes[j].books);
1051             av_freep(&venc->floors[i].classes);
1052             av_freep(&venc->floors[i].partition_to_class);
1053             av_freep(&venc->floors[i].list);
1054         }
1055     av_freep(&venc->floors);
1056
1057     if (venc->residues)
1058         for (i = 0; i < venc->nresidues; i++) {
1059             av_freep(&venc->residues[i].books);
1060             av_freep(&venc->residues[i].maxes);
1061         }
1062     av_freep(&venc->residues);
1063
1064     if (venc->mappings)
1065         for (i = 0; i < venc->nmappings; i++) {
1066             av_freep(&venc->mappings[i].mux);
1067             av_freep(&venc->mappings[i].floor);
1068             av_freep(&venc->mappings[i].residue);
1069             av_freep(&venc->mappings[i].magnitude);
1070             av_freep(&venc->mappings[i].angle);
1071         }
1072     av_freep(&venc->mappings);
1073
1074     av_freep(&venc->modes);
1075
1076     av_freep(&venc->saved);
1077     av_freep(&venc->samples);
1078     av_freep(&venc->floor);
1079     av_freep(&venc->coeffs);
1080
1081     ff_mdct_end(&venc->mdct[0]);
1082     ff_mdct_end(&venc->mdct[1]);
1083
1084     av_freep(&avccontext->coded_frame);
1085     av_freep(&avccontext->extradata);
1086
1087     return 0 ;
1088 }
1089
1090 AVCodec vorbis_encoder = {
1091     "vorbis",
1092     CODEC_TYPE_AUDIO,
1093     CODEC_ID_VORBIS,
1094     sizeof(vorbis_enc_context),
1095     vorbis_encode_init,
1096     vorbis_encode_frame,
1097     vorbis_encode_close,
1098     .capabilities= CODEC_CAP_DELAY,
1099     .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
1100     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1101 };