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 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 #undef NDEBUG
  34 #include <assert.h>
  35
  36 typedef struct {
  37     int nentries;
  38     uint8_t * lens;
  39     uint32_t * codewords;
  40     int ndimentions;
  41     float min;
  42     float delta;
  43     int seq_p;
  44     int lookup;
  45     int * quantlist;
  46     float * dimentions;
  47     float * pow2;
  48 } codebook_t;
  49
  50 typedef struct {
  51     int dim;
  52     int subclass;
  53     int masterbook;
  54     int * books;
  55 } floor_class_t;
  56
  57 typedef struct {
  58     int partitions;
  59     int * partition_to_class;
  60     int nclasses;
  61     floor_class_t * classes;
  62     int multiplier;
  63     int rangebits;
  64     int values;
  65     floor1_entry_t * list;
  66 } floor_t;
  67
  68 typedef struct {
  69     int type;
  70     int begin;
  71     int end;
  72     int partition_size;
  73     int classifications;
  74     int classbook;
  75     int8_t (*books)[8];
  76     float (*maxes)[2];
  77 } residue_t;
  78
  79 typedef struct {
  80     int submaps;
  81     int * mux;
  82     int * floor;
  83     int * residue;
  84     int coupling_steps;
  85     int * magnitude;
  86     int * angle;
  87 } mapping_t;
  88
  89 typedef struct {
  90     int blockflag;
  91     int mapping;
  92 } vorbis_mode_t;
  93
  94 typedef struct {
  95     int channels;
  96     int sample_rate;
  97     int log2_blocksize[2];
  98     MDCTContext mdct[2];
  99     const float * win[2];
 100     int have_saved;
 101     float * saved;
 102     float * samples;
 103     float * floor; // also used for tmp values for mdct
 104     float * coeffs; // also used for residue after floor
 105     float quality;
 106
 107     int ncodebooks;
 108     codebook_t * codebooks;
 109
 110     int nfloors;
 111     floor_t * floors;
 112
 113     int nresidues;
 114     residue_t * residues;
 115
 116     int nmappings;
 117     mapping_t * mappings;
 118
 119     int nmodes;
 120     vorbis_mode_t * modes;
 121 } venc_context_t;
 122
 123 typedef struct {
 124     int total;
 125     int total_pos;
 126     int pos;
 127     uint8_t * buf_ptr;
 128 } PutBitContext;
 129
 130 static inline void init_put_bits(PutBitContext * pb, uint8_t * buf, int buffer_len) {
 131     pb->total = buffer_len * 8;
 132     pb->total_pos = 0;
 133     pb->pos = 0;
 134     pb->buf_ptr = buf;
 135 }
 136
 137 static void put_bits(PutBitContext * pb, int bits, uint64_t val) {
 138     if ((pb->total_pos += bits) >= pb->total) return;
 139     if (!bits) return;
 140     if (pb->pos) {
 141         if (pb->pos > bits) {
 142             *pb->buf_ptr |= val << (8 - pb->pos);
 143             pb->pos -= bits;
 144             bits = 0;
 145         } else {
 146             *pb->buf_ptr++ |= (val << (8 - pb->pos)) & 0xFF;
 147             val >>= pb->pos;
 148             bits -= pb->pos;
 149             pb->pos = 0;
 150         }
 151     }
 152     for (; bits >= 8; bits -= 8) {
 153         *pb->buf_ptr++ = val & 0xFF;
 154         val >>= 8;
 155     }
 156     if (bits) {
 157         *pb->buf_ptr = val;
 158         pb->pos = 8 - bits;
 159     }
 160 }
 161
 162 static inline void flush_put_bits(PutBitContext * pb) {
 163 }
 164
 165 static inline int put_bits_count(PutBitContext * pb) {
 166     return pb->total_pos;
 167 }
 168
 169 static inline void put_codeword(PutBitContext * pb, codebook_t * cb, int entry) {
 170     assert(entry >= 0);
 171     assert(entry < cb->nentries);
 172     assert(cb->lens[entry]);
 173     put_bits(pb, cb->lens[entry], cb->codewords[entry]);
 174 }
 175
 176 static int cb_lookup_vals(int lookup, int dimentions, int entries) {
 177     if      (lookup == 1) return ff_vorbis_nth_root(entries, dimentions);
 178     else if (lookup == 2) return dimentions * entries;
 179     return 0;
 180 }
 181
 182 static void ready_codebook(codebook_t * cb) {
 183     int i;
 184
 185     ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
 186
 187     if (!cb->lookup)
 188         cb->pow2 = cb->dimentions = NULL;
 189     else {
 190         int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
 191         cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
 192         cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
 193         for (i = 0; i < cb->nentries; i++) {
 194             float last = 0;
 195             int j;
 196             int div = 1;
 197             for (j = 0; j < cb->ndimentions; j++) {
 198                 int off;
 199                 if (cb->lookup == 1)
 200                     off = (i / div) % vals; // lookup type 1
 201                 else
 202                     off = i * cb->ndimentions + j; // lookup type 2
 203
 204                 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
 205                 if (cb->seq_p)
 206                     last = cb->dimentions[i * cb->ndimentions + j];
 207                 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j]*cb->dimentions[i * cb->ndimentions + j];
 208                 div *= vals;
 209             }
 210             cb->pow2[i] /= 2.;
 211         }
 212     }
 213 }
 214
 215 static void ready_residue(residue_t * rc, venc_context_t * venc) {
 216     int i;
 217     assert(rc->type == 2);
 218     rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
 219     for (i = 0; i < rc->classifications; i++) {
 220         int j;
 221         codebook_t * cb;
 222         for (j = 0; j < 8; j++)
 223             if (rc->books[i][j] != -1) break;
 224         if (j == 8) continue; // zero
 225         cb = &venc->codebooks[rc->books[i][j]];
 226         assert(cb->ndimentions >= 2);
 227         assert(cb->lookup);
 228
 229         for (j = 0; j < cb->nentries; j++) {
 230             float a;
 231             if (!cb->lens[j]) continue;
 232             a = fabs(cb->dimentions[j * cb->ndimentions]);
 233             if (a > rc->maxes[i][0])
 234                 rc->maxes[i][0] = a;
 235             a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
 236             if (a > rc->maxes[i][1])
 237                 rc->maxes[i][1] = a;
 238         }
 239     }
 240     // small bias
 241     for (i = 0; i < rc->classifications; i++) {
 242         rc->maxes[i][0] += 0.8;
 243         rc->maxes[i][1] += 0.8;
 244     }
 245 }
 246
 247 static void create_vorbis_context(venc_context_t * venc, AVCodecContext * avccontext) {
 248     floor_t * fc;
 249     residue_t * rc;
 250     mapping_t * mc;
 251     int i, book;
 252
 253     venc->channels = avccontext->channels;
 254     venc->sample_rate = avccontext->sample_rate;
 255     venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
 256
 257     venc->ncodebooks = sizeof(cvectors)/sizeof(cvectors[0]);
 258     venc->codebooks = av_malloc(sizeof(codebook_t) * venc->ncodebooks);
 259
 260     // codebook 0..14 - floor1 book, values 0..255
 261     // codebook 15 residue masterbook
 262     // codebook 16..29 residue
 263     for (book = 0; book < venc->ncodebooks; book++) {
 264         codebook_t * cb = &venc->codebooks[book];
 265         int vals;
 266         cb->ndimentions = cvectors[book].dim;
 267         cb->nentries = cvectors[book].real_len;
 268         cb->min = cvectors[book].min;
 269         cb->delta = cvectors[book].delta;
 270         cb->lookup = cvectors[book].lookup;
 271         cb->seq_p = 0;
 272
 273         cb->lens = av_malloc(sizeof(uint8_t) * cb->nentries);
 274         cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
 275         memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
 276         memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
 277
 278         if (cb->lookup) {
 279             vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
 280             cb->quantlist = av_malloc(sizeof(int) * vals);
 281             for (i = 0; i < vals; i++)
 282                 cb->quantlist[i] = cvectors[book].quant[i];
 283         } else {
 284             cb->quantlist = NULL;
 285         }
 286         ready_codebook(cb);
 287     }
 288
 289     venc->nfloors = 1;
 290     venc->floors = av_malloc(sizeof(floor_t) * venc->nfloors);
 291
 292     // just 1 floor
 293     fc = &venc->floors[0];
 294     fc->partitions = 8;
 295     fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
 296     fc->nclasses = 0;
 297     for (i = 0; i < fc->partitions; i++) {
 298         static const int a[] = {0,1,2,2,3,3,4,4};
 299         fc->partition_to_class[i] = a[i];
 300         fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
 301     }
 302     fc->nclasses++;
 303     fc->classes = av_malloc(sizeof(floor_class_t) * fc->nclasses);
 304     for (i = 0; i < fc->nclasses; i++) {
 305         floor_class_t * c = &fc->classes[i];
 306         int j, books;
 307         c->dim = floor_classes[i].dim;
 308         c->subclass = floor_classes[i].subclass;
 309         c->masterbook = floor_classes[i].masterbook;
 310         books = (1 << c->subclass);
 311         c->books = av_malloc(sizeof(int) * books);
 312         for (j = 0; j < books; j++)
 313             c->books[j] = floor_classes[i].nbooks[j];
 314     }
 315     fc->multiplier = 2;
 316     fc->rangebits = venc->log2_blocksize[0] - 1;
 317
 318     fc->values = 2;
 319     for (i = 0; i < fc->partitions; i++)
 320         fc->values += fc->classes[fc->partition_to_class[i]].dim;
 321
 322     fc->list = av_malloc(sizeof(floor1_entry_t) * fc->values);
 323     fc->list[0].x = 0;
 324     fc->list[1].x = 1 << fc->rangebits;
 325     for (i = 2; i < fc->values; i++) {
 326         static const int a[] = {
 327              93, 23,372,  6, 46,186,750, 14, 33, 65,
 328             130,260,556,  3, 10, 18, 28, 39, 55, 79,
 329             111,158,220,312,464,650,850
 330         };
 331         fc->list[i].x = a[i - 2];
 332     }
 333     ff_vorbis_ready_floor1_list(fc->list, fc->values);
 334
 335     venc->nresidues = 1;
 336     venc->residues = av_malloc(sizeof(residue_t) * venc->nresidues);
 337
 338     // single residue
 339     rc = &venc->residues[0];
 340     rc->type = 2;
 341     rc->begin = 0;
 342     rc->end = 1600;
 343     rc->partition_size = 32;
 344     rc->classifications = 10;
 345     rc->classbook = 15;
 346     rc->books = av_malloc(sizeof(*rc->books) * rc->classifications);
 347     {
 348         static const int8_t a[10][8] = {
 349             { -1, -1, -1, -1, -1, -1, -1, -1, },
 350             { -1, -1, 16, -1, -1, -1, -1, -1, },
 351             { -1, -1, 17, -1, -1, -1, -1, -1, },
 352             { -1, -1, 18, -1, -1, -1, -1, -1, },
 353             { -1, -1, 19, -1, -1, -1, -1, -1, },
 354             { -1, -1, 20, -1, -1, -1, -1, -1, },
 355             { -1, -1, 21, -1, -1, -1, -1, -1, },
 356             { 22, 23, -1, -1, -1, -1, -1, -1, },
 357             { 24, 25, -1, -1, -1, -1, -1, -1, },
 358             { 26, 27, 28, -1, -1, -1, -1, -1, },
 359         };
 360         memcpy(rc->books, a, sizeof a);
 361     }
 362     ready_residue(rc, venc);
 363
 364     venc->nmappings = 1;
 365     venc->mappings = av_malloc(sizeof(mapping_t) * venc->nmappings);
 366
 367     // single mapping
 368     mc = &venc->mappings[0];
 369     mc->submaps = 1;
 370     mc->mux = av_malloc(sizeof(int) * venc->channels);
 371     for (i = 0; i < venc->channels; i++)
 372         mc->mux[i] = 0;
 373     mc->floor = av_malloc(sizeof(int) * mc->submaps);
 374     mc->residue = av_malloc(sizeof(int) * mc->submaps);
 375     for (i = 0; i < mc->submaps; i++) {
 376         mc->floor[i] = 0;
 377         mc->residue[i] = 0;
 378     }
 379     mc->coupling_steps = venc->channels == 2 ? 1 : 0;
 380     mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps);
 381     mc->angle = av_malloc(sizeof(int) * mc->coupling_steps);
 382     if (mc->coupling_steps) {
 383         mc->magnitude[0] = 0;
 384         mc->angle[0] = 1;
 385     }
 386
 387     venc->nmodes = 1;
 388     venc->modes = av_malloc(sizeof(vorbis_mode_t) * venc->nmodes);
 389
 390     // single mode
 391     venc->modes[0].blockflag = 0;
 392     venc->modes[0].mapping = 0;
 393
 394     venc->have_saved = 0;
 395     venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 396     venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
 397     venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 398     venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 399
 400     venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
 401     venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
 402
 403     ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0);
 404     ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0);
 405 }
 406
 407 static void put_float(PutBitContext * pb, float f) {
 408     int exp, mant;
 409     uint32_t res = 0;
 410     mant = (int)ldexp(frexp(f, &exp), 20);
 411     exp += 788 - 20;
 412     if (mant < 0) { res |= (1 << 31); mant = -mant; }
 413     res |= mant | (exp << 21);
 414     put_bits(pb, 32, res);
 415 }
 416
 417 static void put_codebook_header(PutBitContext * pb, codebook_t * cb) {
 418     int i;
 419     int ordered = 0;
 420
 421     put_bits(pb, 24, 0x564342); //magic
 422     put_bits(pb, 16, cb->ndimentions);
 423     put_bits(pb, 24, cb->nentries);
 424
 425     for (i = 1; i < cb->nentries; i++)
 426         if (cb->lens[i] < cb->lens[i-1]) break;
 427     if (i == cb->nentries)
 428         ordered = 1;
 429
 430     put_bits(pb, 1, ordered);
 431     if (ordered) {
 432         int len = cb->lens[0];
 433         put_bits(pb, 5, len - 1);
 434         i = 0;
 435         while (i < cb->nentries) {
 436             int j;
 437             for (j = 0; j+i < cb->nentries; j++)
 438                 if (cb->lens[j+i] != len) break;
 439             put_bits(pb, ilog(cb->nentries - i), j);
 440             i += j;
 441             len++;
 442         }
 443     } else {
 444         int sparse = 0;
 445         for (i = 0; i < cb->nentries; i++)
 446             if (!cb->lens[i]) break;
 447         if (i != cb->nentries)
 448             sparse = 1;
 449         put_bits(pb, 1, sparse);
 450
 451         for (i = 0; i < cb->nentries; i++) {
 452             if (sparse) put_bits(pb, 1, !!cb->lens[i]);
 453             if (cb->lens[i]) put_bits(pb, 5, cb->lens[i] - 1);
 454         }
 455     }
 456
 457     put_bits(pb, 4, cb->lookup);
 458     if (cb->lookup) {
 459         int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
 460         int bits = ilog(cb->quantlist[0]);
 461
 462         for (i = 1; i < tmp; i++)
 463             bits = FFMAX(bits, ilog(cb->quantlist[i]));
 464
 465         put_float(pb, cb->min);
 466         put_float(pb, cb->delta);
 467
 468         put_bits(pb, 4, bits - 1);
 469         put_bits(pb, 1, cb->seq_p);
 470
 471         for (i = 0; i < tmp; i++)
 472             put_bits(pb, bits, cb->quantlist[i]);
 473     }
 474 }
 475
 476 static void put_floor_header(PutBitContext * pb, floor_t * fc) {
 477     int i;
 478
 479     put_bits(pb, 16, 1); // type, only floor1 is supported
 480
 481     put_bits(pb, 5, fc->partitions);
 482
 483     for (i = 0; i < fc->partitions; i++)
 484         put_bits(pb, 4, fc->partition_to_class[i]);
 485
 486     for (i = 0; i < fc->nclasses; i++) {
 487         int j, books;
 488
 489         put_bits(pb, 3, fc->classes[i].dim - 1);
 490         put_bits(pb, 2, fc->classes[i].subclass);
 491
 492         if (fc->classes[i].subclass)
 493             put_bits(pb, 8, fc->classes[i].masterbook);
 494
 495         books = (1 << fc->classes[i].subclass);
 496
 497         for (j = 0; j < books; j++)
 498             put_bits(pb, 8, fc->classes[i].books[j] + 1);
 499     }
 500
 501     put_bits(pb, 2, fc->multiplier - 1);
 502     put_bits(pb, 4, fc->rangebits);
 503
 504     for (i = 2; i < fc->values; i++)
 505         put_bits(pb, fc->rangebits, fc->list[i].x);
 506 }
 507
 508 static void put_residue_header(PutBitContext * pb, residue_t * rc) {
 509     int i;
 510
 511     put_bits(pb, 16, rc->type);
 512
 513     put_bits(pb, 24, rc->begin);
 514     put_bits(pb, 24, rc->end);
 515     put_bits(pb, 24, rc->partition_size - 1);
 516     put_bits(pb, 6, rc->classifications - 1);
 517     put_bits(pb, 8, rc->classbook);
 518
 519     for (i = 0; i < rc->classifications; i++) {
 520         int j, tmp = 0;
 521         for (j = 0; j < 8; j++)
 522             tmp |= (rc->books[i][j] != -1) << j;
 523
 524         put_bits(pb, 3, tmp & 7);
 525         put_bits(pb, 1, tmp > 7);
 526
 527         if (tmp > 7)
 528             put_bits(pb, 5, tmp >> 3);
 529     }
 530
 531     for (i = 0; i < rc->classifications; i++) {
 532         int j;
 533         for (j = 0; j < 8; j++)
 534             if (rc->books[i][j] != -1)
 535                 put_bits(pb, 8, rc->books[i][j]);
 536     }
 537 }
 538
 539 static int put_main_header(venc_context_t * venc, uint8_t ** out) {
 540     int i;
 541     PutBitContext pb;
 542     uint8_t buffer[50000] = {0}, * p = buffer;
 543     int buffer_len = sizeof buffer;
 544     int len, hlens[3];
 545
 546     // identification header
 547     init_put_bits(&pb, p, buffer_len);
 548     put_bits(&pb, 8, 1); //magic
 549     for (i = 0; "vorbis"[i]; i++)
 550         put_bits(&pb, 8, "vorbis"[i]);
 551     put_bits(&pb, 32, 0); // version
 552     put_bits(&pb, 8, venc->channels);
 553     put_bits(&pb, 32, venc->sample_rate);
 554     put_bits(&pb, 32, 0); // bitrate
 555     put_bits(&pb, 32, 0); // bitrate
 556     put_bits(&pb, 32, 0); // bitrate
 557     put_bits(&pb, 4, venc->log2_blocksize[0]);
 558     put_bits(&pb, 4, venc->log2_blocksize[1]);
 559     put_bits(&pb, 1, 1); // framing
 560
 561     flush_put_bits(&pb);
 562     hlens[0] = (put_bits_count(&pb) + 7) / 8;
 563     buffer_len -= hlens[0];
 564     p += hlens[0];
 565
 566     // comment header
 567     init_put_bits(&pb, p, buffer_len);
 568     put_bits(&pb, 8, 3); //magic
 569     for (i = 0; "vorbis"[i]; i++)
 570         put_bits(&pb, 8, "vorbis"[i]);
 571     put_bits(&pb, 32, 0); // vendor length TODO
 572     put_bits(&pb, 32, 0); // amount of comments
 573     put_bits(&pb, 1, 1); // framing
 574
 575     flush_put_bits(&pb);
 576     hlens[1] = (put_bits_count(&pb) + 7) / 8;
 577     buffer_len -= hlens[1];
 578     p += hlens[1];
 579
 580     // setup header
 581     init_put_bits(&pb, p, buffer_len);
 582     put_bits(&pb, 8, 5); //magic
 583     for (i = 0; "vorbis"[i]; i++)
 584         put_bits(&pb, 8, "vorbis"[i]);
 585
 586     // codebooks
 587     put_bits(&pb, 8, venc->ncodebooks - 1);
 588     for (i = 0; i < venc->ncodebooks; i++)
 589         put_codebook_header(&pb, &venc->codebooks[i]);
 590
 591     // time domain, reserved, zero
 592     put_bits(&pb, 6, 0);
 593     put_bits(&pb, 16, 0);
 594
 595     // floors
 596     put_bits(&pb, 6, venc->nfloors - 1);
 597     for (i = 0; i < venc->nfloors; i++)
 598         put_floor_header(&pb, &venc->floors[i]);
 599
 600     // residues
 601     put_bits(&pb, 6, venc->nresidues - 1);
 602     for (i = 0; i < venc->nresidues; i++)
 603         put_residue_header(&pb, &venc->residues[i]);
 604
 605     // mappings
 606     put_bits(&pb, 6, venc->nmappings - 1);
 607     for (i = 0; i < venc->nmappings; i++) {
 608         mapping_t * mc = &venc->mappings[i];
 609         int j;
 610         put_bits(&pb, 16, 0); // mapping type
 611
 612         put_bits(&pb, 1, mc->submaps > 1);
 613         if (mc->submaps > 1)
 614             put_bits(&pb, 4, mc->submaps - 1);
 615
 616         put_bits(&pb, 1, !!mc->coupling_steps);
 617         if (mc->coupling_steps) {
 618             put_bits(&pb, 8, mc->coupling_steps - 1);
 619             for (j = 0; j < mc->coupling_steps; j++) {
 620                 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
 621                 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
 622             }
 623         }
 624
 625         put_bits(&pb, 2, 0); // reserved
 626
 627         if (mc->submaps > 1)
 628             for (j = 0; j < venc->channels; j++)
 629                 put_bits(&pb, 4, mc->mux[j]);
 630
 631         for (j = 0; j < mc->submaps; j++) {
 632             put_bits(&pb, 8, 0); // reserved time configuration
 633             put_bits(&pb, 8, mc->floor[j]);
 634             put_bits(&pb, 8, mc->residue[j]);
 635         }
 636     }
 637
 638     // modes
 639     put_bits(&pb, 6, venc->nmodes - 1);
 640     for (i = 0; i < venc->nmodes; i++) {
 641         put_bits(&pb, 1, venc->modes[i].blockflag);
 642         put_bits(&pb, 16, 0); // reserved window type
 643         put_bits(&pb, 16, 0); // reserved transform type
 644         put_bits(&pb, 8, venc->modes[i].mapping);
 645     }
 646
 647     put_bits(&pb, 1, 1); // framing
 648
 649     flush_put_bits(&pb);
 650     hlens[2] = (put_bits_count(&pb) + 7) / 8;
 651
 652     len = hlens[0] + hlens[1] + hlens[2];
 653     p = *out = av_mallocz(64 + len + len/255);
 654
 655     *p++ = 2;
 656     p += av_xiphlacing(p, hlens[0]);
 657     p += av_xiphlacing(p, hlens[1]);
 658     buffer_len = 0;
 659     for (i = 0; i < 3; i++) {
 660         memcpy(p, buffer + buffer_len, hlens[i]);
 661         p += hlens[i];
 662         buffer_len += hlens[i];
 663     }
 664
 665     return p - *out;
 666 }
 667
 668 static float get_floor_average(floor_t * fc, float * coeffs, int i) {
 669     int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
 670     int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
 671     int j;
 672     float average = 0;
 673
 674     for (j = begin; j < end; j++)
 675         average += fabs(coeffs[j]);
 676     return average / (end - begin);
 677 }
 678
 679 static void floor_fit(venc_context_t * venc, floor_t * fc, float * coeffs, uint_fast16_t * posts, int samples) {
 680     int range = 255 / fc->multiplier + 1;
 681     int i;
 682     float tot_average = 0.;
 683     float averages[fc->values];
 684     for (i = 0; i < fc->values; i++){
 685         averages[i] = get_floor_average(fc, coeffs, i);
 686         tot_average += averages[i];
 687     }
 688     tot_average /= fc->values;
 689     tot_average /= venc->quality;
 690
 691     for (i = 0; i < fc->values; i++) {
 692         int position = fc->list[fc->list[i].sort].x;
 693         float average = averages[i];
 694         int j;
 695
 696         average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC!
 697         for (j = 0; j < range - 1; j++)
 698             if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average) break;
 699         posts[fc->list[i].sort] = j;
 700     }
 701 }
 702
 703 static int render_point(int x0, int y0, int x1, int y1, int x) {
 704     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
 705 }
 706
 707 static void floor_encode(venc_context_t * venc, floor_t * fc, PutBitContext * pb, uint_fast16_t * posts, float * floor, int samples) {
 708     int range = 255 / fc->multiplier + 1;
 709     int coded[fc->values]; // first 2 values are unused
 710     int i, counter;
 711
 712     put_bits(pb, 1, 1); // non zero
 713     put_bits(pb, ilog(range - 1), posts[0]);
 714     put_bits(pb, ilog(range - 1), posts[1]);
 715     coded[0] = coded[1] = 1;
 716
 717     for (i = 2; i < fc->values; i++) {
 718         int predicted = render_point(fc->list[fc->list[i].low].x,
 719                                      posts[fc->list[i].low],
 720                                      fc->list[fc->list[i].high].x,
 721                                      posts[fc->list[i].high],
 722                                      fc->list[i].x);
 723         int highroom = range - predicted;
 724         int lowroom = predicted;
 725         int room = FFMIN(highroom, lowroom);
 726         if (predicted == posts[i]) {
 727             coded[i] = 0; // must be used later as flag!
 728             continue;
 729         } else {
 730             if (!coded[fc->list[i].low ]) coded[fc->list[i].low ] = -1;
 731             if (!coded[fc->list[i].high]) coded[fc->list[i].high] = -1;
 732         }
 733         if (posts[i] > predicted) {
 734             if (posts[i] - predicted > room)
 735                 coded[i] = posts[i] - predicted + lowroom;
 736             else
 737                 coded[i] = (posts[i] - predicted) << 1;
 738         } else {
 739             if (predicted - posts[i] > room)
 740                 coded[i] = predicted - posts[i] + highroom - 1;
 741             else
 742                 coded[i] = ((predicted - posts[i]) << 1) - 1;
 743         }
 744     }
 745
 746     counter = 2;
 747     for (i = 0; i < fc->partitions; i++) {
 748         floor_class_t * c = &fc->classes[fc->partition_to_class[i]];
 749         int k, cval = 0, csub = 1<<c->subclass;
 750         if (c->subclass) {
 751             codebook_t * book = &venc->codebooks[c->masterbook];
 752             int cshift = 0;
 753             for (k = 0; k < c->dim; k++) {
 754                 int l;
 755                 for (l = 0; l < csub; l++) {
 756                     int maxval = 1;
 757                     if (c->books[l] != -1)
 758                         maxval = venc->codebooks[c->books[l]].nentries;
 759                     // coded could be -1, but this still works, cause that is 0
 760                     if (coded[counter + k] < maxval) break;
 761                 }
 762                 assert(l != csub);
 763                 cval |= l << cshift;
 764                 cshift += c->subclass;
 765             }
 766             put_codeword(pb, book, cval);
 767         }
 768         for (k = 0; k < c->dim; k++) {
 769             int book = c->books[cval & (csub-1)];
 770             int entry = coded[counter++];
 771             cval >>= c->subclass;
 772             if (book == -1) continue;
 773             if (entry == -1) entry = 0;
 774             put_codeword(pb, &venc->codebooks[book], entry);
 775         }
 776     }
 777
 778     ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded, fc->multiplier, floor, samples);
 779 }
 780
 781 static float * put_vector(codebook_t * book, PutBitContext * pb, float * num) {
 782     int i, entry = -1;
 783     float distance = FLT_MAX;
 784     assert(book->dimentions);
 785     for (i = 0; i < book->nentries; i++) {
 786         float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
 787         int j;
 788         if (!book->lens[i]) continue;
 789         for (j = 0; j < book->ndimentions; j++)
 790             d -= vec[j] * num[j];
 791         if (distance > d) {
 792             entry = i;
 793             distance = d;
 794         }
 795     }
 796     put_codeword(pb, book, entry);
 797     return &book->dimentions[entry * book->ndimentions];
 798 }
 799
 800 static void residue_encode(venc_context_t * venc, residue_t * rc, PutBitContext * pb, float * coeffs, int samples, int real_ch) {
 801     int pass, i, j, p, k;
 802     int psize = rc->partition_size;
 803     int partitions = (rc->end - rc->begin) / psize;
 804     int channels = (rc->type == 2) ? 1 : real_ch;
 805     int classes[channels][partitions];
 806     int classwords = venc->codebooks[rc->classbook].ndimentions;
 807
 808     assert(rc->type == 2);
 809     assert(real_ch == 2);
 810     for (p = 0; p < partitions; p++) {
 811         float max1 = 0., max2 = 0.;
 812         int s = rc->begin + p * psize;
 813         for (k = s; k < s + psize; k += 2) {
 814             max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
 815             max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
 816         }
 817
 818         for (i = 0; i < rc->classifications - 1; i++) {
 819             if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1]) break;
 820         }
 821         classes[0][p] = i;
 822     }
 823
 824     for (pass = 0; pass < 8; pass++) {
 825         p = 0;
 826         while (p < partitions) {
 827             if (pass == 0)
 828                 for (j = 0; j < channels; j++) {
 829                     codebook_t * book = &venc->codebooks[rc->classbook];
 830                     int entry = 0;
 831                     for (i = 0; i < classwords; i++) {
 832                         entry *= rc->classifications;
 833                         entry += classes[j][p + i];
 834                     }
 835                     put_codeword(pb, book, entry);
 836                 }
 837             for (i = 0; i < classwords && p < partitions; i++, p++) {
 838                 for (j = 0; j < channels; j++) {
 839                     int nbook = rc->books[classes[j][p]][pass];
 840                     codebook_t * book = &venc->codebooks[nbook];
 841                     float * buf = coeffs + samples*j + rc->begin + p*psize;
 842                     if (nbook == -1) continue;
 843
 844                     assert(rc->type == 0 || rc->type == 2);
 845                     assert(!(psize % book->ndimentions));
 846
 847                     if (rc->type == 0) {
 848                         for (k = 0; k < psize; k += book->ndimentions) {
 849                             float * a = put_vector(book, pb, &buf[k]);
 850                             int l;
 851                             for (l = 0; l < book->ndimentions; l++)
 852                                 buf[k + l] -= a[l];
 853                         }
 854                     } else {
 855                         int s = rc->begin + p * psize, a1, b1;
 856                         a1 = (s % real_ch) * samples;
 857                         b1 =  s / real_ch;
 858                         s = real_ch * samples;
 859                         for (k = 0; k < psize; k += book->ndimentions) {
 860                             int dim, a2 = a1, b2 = b1;
 861                             float vec[book->ndimentions], * pv = vec;
 862                             for (dim = book->ndimentions; dim--; ) {
 863                                 *pv++ = coeffs[a2 + b2];
 864                                 if ((a2 += samples) == s) {
 865                                     a2=0;
 866                                     b2++;
 867                                 }
 868                             }
 869                             pv = put_vector(book, pb, vec);
 870                             for (dim = book->ndimentions; dim--; ) {
 871                                 coeffs[a1 + b1] -= *pv++;
 872                                 if ((a1 += samples) == s) {
 873                                     a1=0;
 874                                     b1++;
 875                                 }
 876                             }
 877                         }
 878                     }
 879                 }
 880             }
 881         }
 882     }
 883 }
 884
 885 static int apply_window_and_mdct(venc_context_t * venc, signed short * audio, int samples) {
 886     int i, j, channel;
 887     const float * win = venc->win[0];
 888     int window_len = 1 << (venc->log2_blocksize[0] - 1);
 889     float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
 890     // FIXME use dsp
 891
 892     if (!venc->have_saved && !samples) return 0;
 893
 894     if (venc->have_saved) {
 895         for (channel = 0; channel < venc->channels; channel++) {
 896             memcpy(venc->samples + channel*window_len*2, venc->saved + channel*window_len, sizeof(float)*window_len);
 897         }
 898     } else {
 899         for (channel = 0; channel < venc->channels; channel++) {
 900             memset(venc->samples + channel*window_len*2, 0, sizeof(float)*window_len);
 901         }
 902     }
 903
 904     if (samples) {
 905         for (channel = 0; channel < venc->channels; channel++) {
 906             float * offset = venc->samples + channel*window_len*2 + window_len;
 907             j = channel;
 908             for (i = 0; i < samples; i++, j += venc->channels)
 909                 offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped
 910         }
 911     } else {
 912         for (channel = 0; channel < venc->channels; channel++) {
 913             memset(venc->samples + channel*window_len*2 + window_len, 0, sizeof(float)*window_len);
 914         }
 915     }
 916
 917     for (channel = 0; channel < venc->channels; channel++) {
 918         ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel*window_len, venc->samples + channel*window_len*2, venc->floor/*tmp*/);
 919     }
 920
 921     if (samples) {
 922         for (channel = 0; channel < venc->channels; channel++) {
 923             float * offset = venc->saved + channel*window_len;
 924             j = channel;
 925             for (i = 0; i < samples; i++, j += venc->channels)
 926                 offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped
 927         }
 928         venc->have_saved = 1;
 929     } else {
 930         venc->have_saved = 0;
 931     }
 932     return 1;
 933 }
 934
 935 static av_cold int vorbis_encode_init(AVCodecContext * avccontext)
 936 {
 937     venc_context_t * venc = avccontext->priv_data;
 938
 939     if (avccontext->channels != 2) {
 940         av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
 941         return -1;
 942     }
 943
 944     create_vorbis_context(venc, avccontext);
 945
 946     if (avccontext->flags & CODEC_FLAG_QSCALE)
 947         venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
 948     else
 949         venc->quality = 1.;
 950     venc->quality *= venc->quality;
 951
 952     avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
 953
 954     avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);
 955
 956     avccontext->coded_frame = avcodec_alloc_frame();
 957     avccontext->coded_frame->key_frame = 1;
 958
 959     return 0;
 960 }
 961
 962 static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * packets, int buf_size, void *data)
 963 {
 964     venc_context_t * venc = avccontext->priv_data;
 965     signed short * audio = data;
 966     int samples = data ? avccontext->frame_size : 0;
 967     vorbis_mode_t * mode;
 968     mapping_t * mapping;
 969     PutBitContext pb;
 970     int i;
 971
 972     if (!apply_window_and_mdct(venc, audio, samples)) return 0;
 973     samples = 1 << (venc->log2_blocksize[0] - 1);
 974
 975     init_put_bits(&pb, packets, buf_size);
 976
 977     put_bits(&pb, 1, 0); // magic bit
 978
 979     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
 980
 981     mode = &venc->modes[0];
 982     mapping = &venc->mappings[mode->mapping];
 983     if (mode->blockflag) {
 984         put_bits(&pb, 1, 0);
 985         put_bits(&pb, 1, 0);
 986     }
 987
 988     for (i = 0; i < venc->channels; i++) {
 989         floor_t * fc = &venc->floors[mapping->floor[mapping->mux[i]]];
 990         uint_fast16_t posts[fc->values];
 991         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
 992         floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
 993     }
 994
 995     for (i = 0; i < venc->channels * samples; i++) {
 996         venc->coeffs[i] /= venc->floor[i];
 997     }
 998
 999     for (i = 0; i < mapping->coupling_steps; i++) {
1000         float * mag = venc->coeffs + mapping->magnitude[i] * samples;
1001         float * ang = venc->coeffs + mapping->angle[i] * samples;
1002         int j;
1003         for (j = 0; j < samples; j++) {
1004             float a = ang[j];
1005             ang[j] -= mag[j];
1006             if (mag[j] > 0) ang[j] = -ang[j];
1007             if (ang[j] < 0) mag[j] = a;
1008         }
1009     }
1010
1011     residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], &pb, venc->coeffs, samples, venc->channels);
1012
1013     flush_put_bits(&pb);
1014     return (put_bits_count(&pb) + 7) / 8;
1015 }
1016
1017
1018 static av_cold int vorbis_encode_close(AVCodecContext * avccontext)
1019 {
1020     venc_context_t * venc = avccontext->priv_data;
1021     int i;
1022
1023     if (venc->codebooks)
1024         for (i = 0; i < venc->ncodebooks; i++) {
1025             av_freep(&venc->codebooks[i].lens);
1026             av_freep(&venc->codebooks[i].codewords);
1027             av_freep(&venc->codebooks[i].quantlist);
1028             av_freep(&venc->codebooks[i].dimentions);
1029             av_freep(&venc->codebooks[i].pow2);
1030         }
1031     av_freep(&venc->codebooks);
1032
1033     if (venc->floors)
1034         for (i = 0; i < venc->nfloors; i++) {
1035             int j;
1036             if (venc->floors[i].classes)
1037                 for (j = 0; j < venc->floors[i].nclasses; j++)
1038                     av_freep(&venc->floors[i].classes[j].books);
1039             av_freep(&venc->floors[i].classes);
1040             av_freep(&venc->floors[i].partition_to_class);
1041             av_freep(&venc->floors[i].list);
1042         }
1043     av_freep(&venc->floors);
1044
1045     if (venc->residues)
1046         for (i = 0; i < venc->nresidues; i++) {
1047             av_freep(&venc->residues[i].books);
1048             av_freep(&venc->residues[i].maxes);
1049         }
1050     av_freep(&venc->residues);
1051
1052     if (venc->mappings)
1053         for (i = 0; i < venc->nmappings; i++) {
1054             av_freep(&venc->mappings[i].mux);
1055             av_freep(&venc->mappings[i].floor);
1056             av_freep(&venc->mappings[i].residue);
1057             av_freep(&venc->mappings[i].magnitude);
1058             av_freep(&venc->mappings[i].angle);
1059         }
1060     av_freep(&venc->mappings);
1061
1062     av_freep(&venc->modes);
1063
1064     av_freep(&venc->saved);
1065     av_freep(&venc->samples);
1066     av_freep(&venc->floor);
1067     av_freep(&venc->coeffs);
1068
1069     ff_mdct_end(&venc->mdct[0]);
1070     ff_mdct_end(&venc->mdct[1]);
1071
1072     av_freep(&avccontext->coded_frame);
1073     av_freep(&avccontext->extradata);
1074
1075     return 0 ;
1076 }
1077
1078 AVCodec vorbis_encoder = {
1079     "vorbis",
1080     CODEC_TYPE_AUDIO,
1081     CODEC_ID_VORBIS,
1082     sizeof(venc_context_t),
1083     vorbis_encode_init,
1084     vorbis_encode_frame,
1085     vorbis_encode_close,
1086     .capabilities= CODEC_CAP_DELAY,
1087     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1088 };