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     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
 128 static 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
 135 static 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
 141 static 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
 174 static 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
 206 static 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, 1.0);
 363     ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0);
 364 }
 365
 366 static 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
 376 static 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
 435 static 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
 467 static 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
 498 static 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
 627 static 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
 638 static 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
 662 static int render_point(int x0, int y0, int x1, int y1, int x) {
 663     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
 664 }
 665
 666 static 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
 740 static 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
 759 static 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
 844 static 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
 894 static 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
 921 static 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
 979 static 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
1039 AVCodec 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 };