libavcodec/vorbisenc.c

   1 /*
   2  * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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
  23  * Native Vorbis encoder.
  24  * @author Oded Shimon <ods15@ods15.dyndns.org>
  25  */
  26
  27 #include <float.h>
  28 #include "avcodec.h"
  29 #include "internal.h"
  30 #include "fft.h"
  31 #include "vorbis.h"
  32 #include "vorbis_enc_data.h"
  33
  34 #define BITSTREAM_WRITER_LE
  35 #include "put_bits.h"
  36
  37 #undef NDEBUG
  38 #include <assert.h>
  39
  40 typedef struct {
  41     int nentries;
  42     uint8_t *lens;
  43     uint32_t *codewords;
  44     int ndimensions;
  45     float min;
  46     float delta;
  47     int seq_p;
  48     int lookup;
  49     int *quantlist;
  50     float *dimensions;
  51     float *pow2;
  52 } vorbis_enc_codebook;
  53
  54 typedef struct {
  55     int dim;
  56     int subclass;
  57     int masterbook;
  58     int *books;
  59 } vorbis_enc_floor_class;
  60
  61 typedef struct {
  62     int partitions;
  63     int *partition_to_class;
  64     int nclasses;
  65     vorbis_enc_floor_class *classes;
  66     int multiplier;
  67     int rangebits;
  68     int values;
  69     vorbis_floor1_entry *list;
  70 } vorbis_enc_floor;
  71
  72 typedef struct {
  73     int type;
  74     int begin;
  75     int end;
  76     int partition_size;
  77     int classifications;
  78     int classbook;
  79     int8_t (*books)[8];
  80     float (*maxes)[2];
  81 } vorbis_enc_residue;
  82
  83 typedef struct {
  84     int submaps;
  85     int *mux;
  86     int *floor;
  87     int *residue;
  88     int coupling_steps;
  89     int *magnitude;
  90     int *angle;
  91 } vorbis_enc_mapping;
  92
  93 typedef struct {
  94     int blockflag;
  95     int mapping;
  96 } vorbis_enc_mode;
  97
  98 typedef struct {
  99     int channels;
 100     int sample_rate;
 101     int log2_blocksize[2];
 102     FFTContext mdct[2];
 103     const float *win[2];
 104     int have_saved;
 105     float *saved;
 106     float *samples;
 107     float *floor;  // also used for tmp values for mdct
 108     float *coeffs; // also used for residue after floor
 109     float quality;
 110
 111     int ncodebooks;
 112     vorbis_enc_codebook *codebooks;
 113
 114     int nfloors;
 115     vorbis_enc_floor *floors;
 116
 117     int nresidues;
 118     vorbis_enc_residue *residues;
 119
 120     int nmappings;
 121     vorbis_enc_mapping *mappings;
 122
 123     int nmodes;
 124     vorbis_enc_mode *modes;
 125
 126     int64_t next_pts;
 127 } vorbis_enc_context;
 128
 129 #define MAX_CHANNELS     2
 130 #define MAX_CODEBOOK_DIM 8
 131
 132 #define MAX_FLOOR_CLASS_DIM  4
 133 #define NUM_FLOOR_PARTITIONS 8
 134 #define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
 135
 136 #define RESIDUE_SIZE           1600
 137 #define RESIDUE_PART_SIZE      32
 138 #define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
 139
 140 static inline int put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
 141                                int entry)
 142 {
 143     assert(entry >= 0);
 144     assert(entry < cb->nentries);
 145     assert(cb->lens[entry]);
 146     if (pb->size_in_bits - put_bits_count(pb) < cb->lens[entry])
 147         return AVERROR(EINVAL);
 148     put_bits(pb, cb->lens[entry], cb->codewords[entry]);
 149     return 0;
 150 }
 151
 152 static int cb_lookup_vals(int lookup, int dimensions, int entries)
 153 {
 154     if (lookup == 1)
 155         return ff_vorbis_nth_root(entries, dimensions);
 156     else if (lookup == 2)
 157         return dimensions *entries;
 158     return 0;
 159 }
 160
 161 static int ready_codebook(vorbis_enc_codebook *cb)
 162 {
 163     int i;
 164
 165     ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
 166
 167     if (!cb->lookup) {
 168         cb->pow2 = cb->dimensions = NULL;
 169     } else {
 170         int vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
 171         cb->dimensions = av_malloc(sizeof(float) * cb->nentries * cb->ndimensions);
 172         cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
 173         if (!cb->dimensions || !cb->pow2)
 174             return AVERROR(ENOMEM);
 175         for (i = 0; i < cb->nentries; i++) {
 176             float last = 0;
 177             int j;
 178             int div = 1;
 179             for (j = 0; j < cb->ndimensions; j++) {
 180                 int off;
 181                 if (cb->lookup == 1)
 182                     off = (i / div) % vals; // lookup type 1
 183                 else
 184                     off = i * cb->ndimensions + j; // lookup type 2
 185
 186                 cb->dimensions[i * cb->ndimensions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
 187                 if (cb->seq_p)
 188                     last = cb->dimensions[i * cb->ndimensions + j];
 189                 cb->pow2[i] += cb->dimensions[i * cb->ndimensions + j] * cb->dimensions[i * cb->ndimensions + j];
 190                 div *= vals;
 191             }
 192             cb->pow2[i] /= 2.0;
 193         }
 194     }
 195     return 0;
 196 }
 197
 198 static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
 199 {
 200     int i;
 201     assert(rc->type == 2);
 202     rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
 203     if (!rc->maxes)
 204         return AVERROR(ENOMEM);
 205     for (i = 0; i < rc->classifications; i++) {
 206         int j;
 207         vorbis_enc_codebook * cb;
 208         for (j = 0; j < 8; j++)
 209             if (rc->books[i][j] != -1)
 210                 break;
 211         if (j == 8) // zero
 212             continue;
 213         cb = &venc->codebooks[rc->books[i][j]];
 214         assert(cb->ndimensions >= 2);
 215         assert(cb->lookup);
 216
 217         for (j = 0; j < cb->nentries; j++) {
 218             float a;
 219             if (!cb->lens[j])
 220                 continue;
 221             a = fabs(cb->dimensions[j * cb->ndimensions]);
 222             if (a > rc->maxes[i][0])
 223                 rc->maxes[i][0] = a;
 224             a = fabs(cb->dimensions[j * cb->ndimensions + 1]);
 225             if (a > rc->maxes[i][1])
 226                 rc->maxes[i][1] = a;
 227         }
 228     }
 229     // small bias
 230     for (i = 0; i < rc->classifications; i++) {
 231         rc->maxes[i][0] += 0.8;
 232         rc->maxes[i][1] += 0.8;
 233     }
 234     return 0;
 235 }
 236
 237 static int create_vorbis_context(vorbis_enc_context *venc,
 238                                  AVCodecContext *avctx)
 239 {
 240     vorbis_enc_floor   *fc;
 241     vorbis_enc_residue *rc;
 242     vorbis_enc_mapping *mc;
 243     int i, book, ret;
 244
 245     venc->channels    = avctx->channels;
 246     venc->sample_rate = avctx->sample_rate;
 247     venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
 248
 249     venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
 250     venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
 251     if (!venc->codebooks)
 252         return AVERROR(ENOMEM);
 253
 254     // codebook 0..14 - floor1 book, values 0..255
 255     // codebook 15 residue masterbook
 256     // codebook 16..29 residue
 257     for (book = 0; book < venc->ncodebooks; book++) {
 258         vorbis_enc_codebook *cb = &venc->codebooks[book];
 259         int vals;
 260         cb->ndimensions = cvectors[book].dim;
 261         cb->nentries    = cvectors[book].real_len;
 262         cb->min         = cvectors[book].min;
 263         cb->delta       = cvectors[book].delta;
 264         cb->lookup      = cvectors[book].lookup;
 265         cb->seq_p       = 0;
 266
 267         cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
 268         cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
 269         if (!cb->lens || !cb->codewords)
 270             return AVERROR(ENOMEM);
 271         memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
 272         memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
 273
 274         if (cb->lookup) {
 275             vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
 276             cb->quantlist = av_malloc(sizeof(int) * vals);
 277             if (!cb->quantlist)
 278                 return AVERROR(ENOMEM);
 279             for (i = 0; i < vals; i++)
 280                 cb->quantlist[i] = cvectors[book].quant[i];
 281         } else {
 282             cb->quantlist = NULL;
 283         }
 284         if ((ret = ready_codebook(cb)) < 0)
 285             return ret;
 286     }
 287
 288     venc->nfloors = 1;
 289     venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
 290     if (!venc->floors)
 291         return AVERROR(ENOMEM);
 292
 293     // just 1 floor
 294     fc = &venc->floors[0];
 295     fc->partitions         = NUM_FLOOR_PARTITIONS;
 296     fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
 297     if (!fc->partition_to_class)
 298         return AVERROR(ENOMEM);
 299     fc->nclasses           = 0;
 300     for (i = 0; i < fc->partitions; i++) {
 301         static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
 302         fc->partition_to_class[i] = a[i];
 303         fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
 304     }
 305     fc->nclasses++;
 306     fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
 307     if (!fc->classes)
 308         return AVERROR(ENOMEM);
 309     for (i = 0; i < fc->nclasses; i++) {
 310         vorbis_enc_floor_class * c = &fc->classes[i];
 311         int j, books;
 312         c->dim        = floor_classes[i].dim;
 313         c->subclass   = floor_classes[i].subclass;
 314         c->masterbook = floor_classes[i].masterbook;
 315         books         = (1 << c->subclass);
 316         c->books      = av_malloc(sizeof(int) * books);
 317         if (!c->books)
 318             return AVERROR(ENOMEM);
 319         for (j = 0; j < books; j++)
 320             c->books[j] = floor_classes[i].nbooks[j];
 321     }
 322     fc->multiplier = 2;
 323     fc->rangebits  = venc->log2_blocksize[0] - 1;
 324
 325     fc->values = 2;
 326     for (i = 0; i < fc->partitions; i++)
 327         fc->values += fc->classes[fc->partition_to_class[i]].dim;
 328
 329     fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
 330     if (!fc->list)
 331         return AVERROR(ENOMEM);
 332     fc->list[0].x = 0;
 333     fc->list[1].x = 1 << fc->rangebits;
 334     for (i = 2; i < fc->values; i++) {
 335         static const int a[] = {
 336              93, 23,372,  6, 46,186,750, 14, 33, 65,
 337             130,260,556,  3, 10, 18, 28, 39, 55, 79,
 338             111,158,220,312,464,650,850
 339         };
 340         fc->list[i].x = a[i - 2];
 341     }
 342     if (ff_vorbis_ready_floor1_list(avctx, fc->list, fc->values))
 343         return AVERROR_BUG;
 344
 345     venc->nresidues = 1;
 346     venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
 347     if (!venc->residues)
 348         return AVERROR(ENOMEM);
 349
 350     // single residue
 351     rc = &venc->residues[0];
 352     rc->type            = 2;
 353     rc->begin           = 0;
 354     rc->end             = 1600;
 355     rc->partition_size  = 32;
 356     rc->classifications = 10;
 357     rc->classbook       = 15;
 358     rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
 359     if (!rc->books)
 360         return AVERROR(ENOMEM);
 361     {
 362         static const int8_t a[10][8] = {
 363             { -1, -1, -1, -1, -1, -1, -1, -1, },
 364             { -1, -1, 16, -1, -1, -1, -1, -1, },
 365             { -1, -1, 17, -1, -1, -1, -1, -1, },
 366             { -1, -1, 18, -1, -1, -1, -1, -1, },
 367             { -1, -1, 19, -1, -1, -1, -1, -1, },
 368             { -1, -1, 20, -1, -1, -1, -1, -1, },
 369             { -1, -1, 21, -1, -1, -1, -1, -1, },
 370             { 22, 23, -1, -1, -1, -1, -1, -1, },
 371             { 24, 25, -1, -1, -1, -1, -1, -1, },
 372             { 26, 27, 28, -1, -1, -1, -1, -1, },
 373         };
 374         memcpy(rc->books, a, sizeof a);
 375     }
 376     if ((ret = ready_residue(rc, venc)) < 0)
 377         return ret;
 378
 379     venc->nmappings = 1;
 380     venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
 381     if (!venc->mappings)
 382         return AVERROR(ENOMEM);
 383
 384     // single mapping
 385     mc = &venc->mappings[0];
 386     mc->submaps = 1;
 387     mc->mux     = av_malloc(sizeof(int) * venc->channels);
 388     if (!mc->mux)
 389         return AVERROR(ENOMEM);
 390     for (i = 0; i < venc->channels; i++)
 391         mc->mux[i] = 0;
 392     mc->floor   = av_malloc(sizeof(int) * mc->submaps);
 393     mc->residue = av_malloc(sizeof(int) * mc->submaps);
 394     if (!mc->floor || !mc->residue)
 395         return AVERROR(ENOMEM);
 396     for (i = 0; i < mc->submaps; i++) {
 397         mc->floor[i]   = 0;
 398         mc->residue[i] = 0;
 399     }
 400     mc->coupling_steps = venc->channels == 2 ? 1 : 0;
 401     mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
 402     mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
 403     if (!mc->magnitude || !mc->angle)
 404         return AVERROR(ENOMEM);
 405     if (mc->coupling_steps) {
 406         mc->magnitude[0] = 0;
 407         mc->angle[0]     = 1;
 408     }
 409
 410     venc->nmodes = 1;
 411     venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
 412     if (!venc->modes)
 413         return AVERROR(ENOMEM);
 414
 415     // single mode
 416     venc->modes[0].blockflag = 0;
 417     venc->modes[0].mapping   = 0;
 418
 419     venc->have_saved = 0;
 420     venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 421     venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
 422     venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 423     venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
 424     if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs)
 425         return AVERROR(ENOMEM);
 426
 427     venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
 428     venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
 429
 430     if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)
 431         return ret;
 432     if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)
 433         return ret;
 434
 435     return 0;
 436 }
 437
 438 static void put_float(PutBitContext *pb, float f)
 439 {
 440     int exp, mant;
 441     uint32_t res = 0;
 442     mant = (int)ldexp(frexp(f, &exp), 20);
 443     exp += 788 - 20;
 444     if (mant < 0) {
 445         res |= (1U << 31);
 446         mant = -mant;
 447     }
 448     res |= mant | (exp << 21);
 449     put_bits32(pb, res);
 450 }
 451
 452 static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
 453 {
 454     int i;
 455     int ordered = 0;
 456
 457     put_bits(pb, 24, 0x564342); //magic
 458     put_bits(pb, 16, cb->ndimensions);
 459     put_bits(pb, 24, cb->nentries);
 460
 461     for (i = 1; i < cb->nentries; i++)
 462         if (cb->lens[i] < cb->lens[i-1])
 463             break;
 464     if (i == cb->nentries)
 465         ordered = 1;
 466
 467     put_bits(pb, 1, ordered);
 468     if (ordered) {
 469         int len = cb->lens[0];
 470         put_bits(pb, 5, len - 1);
 471         i = 0;
 472         while (i < cb->nentries) {
 473             int j;
 474             for (j = 0; j+i < cb->nentries; j++)
 475                 if (cb->lens[j+i] != len)
 476                     break;
 477             put_bits(pb, ilog(cb->nentries - i), j);
 478             i += j;
 479             len++;
 480         }
 481     } else {
 482         int sparse = 0;
 483         for (i = 0; i < cb->nentries; i++)
 484             if (!cb->lens[i])
 485                 break;
 486         if (i != cb->nentries)
 487             sparse = 1;
 488         put_bits(pb, 1, sparse);
 489
 490         for (i = 0; i < cb->nentries; i++) {
 491             if (sparse)
 492                 put_bits(pb, 1, !!cb->lens[i]);
 493             if (cb->lens[i])
 494                 put_bits(pb, 5, cb->lens[i] - 1);
 495         }
 496     }
 497
 498     put_bits(pb, 4, cb->lookup);
 499     if (cb->lookup) {
 500         int tmp  = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
 501         int bits = ilog(cb->quantlist[0]);
 502
 503         for (i = 1; i < tmp; i++)
 504             bits = FFMAX(bits, ilog(cb->quantlist[i]));
 505
 506         put_float(pb, cb->min);
 507         put_float(pb, cb->delta);
 508
 509         put_bits(pb, 4, bits - 1);
 510         put_bits(pb, 1, cb->seq_p);
 511
 512         for (i = 0; i < tmp; i++)
 513             put_bits(pb, bits, cb->quantlist[i]);
 514     }
 515 }
 516
 517 static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
 518 {
 519     int i;
 520
 521     put_bits(pb, 16, 1); // type, only floor1 is supported
 522
 523     put_bits(pb, 5, fc->partitions);
 524
 525     for (i = 0; i < fc->partitions; i++)
 526         put_bits(pb, 4, fc->partition_to_class[i]);
 527
 528     for (i = 0; i < fc->nclasses; i++) {
 529         int j, books;
 530
 531         put_bits(pb, 3, fc->classes[i].dim - 1);
 532         put_bits(pb, 2, fc->classes[i].subclass);
 533
 534         if (fc->classes[i].subclass)
 535             put_bits(pb, 8, fc->classes[i].masterbook);
 536
 537         books = (1 << fc->classes[i].subclass);
 538
 539         for (j = 0; j < books; j++)
 540             put_bits(pb, 8, fc->classes[i].books[j] + 1);
 541     }
 542
 543     put_bits(pb, 2, fc->multiplier - 1);
 544     put_bits(pb, 4, fc->rangebits);
 545
 546     for (i = 2; i < fc->values; i++)
 547         put_bits(pb, fc->rangebits, fc->list[i].x);
 548 }
 549
 550 static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
 551 {
 552     int i;
 553
 554     put_bits(pb, 16, rc->type);
 555
 556     put_bits(pb, 24, rc->begin);
 557     put_bits(pb, 24, rc->end);
 558     put_bits(pb, 24, rc->partition_size - 1);
 559     put_bits(pb, 6, rc->classifications - 1);
 560     put_bits(pb, 8, rc->classbook);
 561
 562     for (i = 0; i < rc->classifications; i++) {
 563         int j, tmp = 0;
 564         for (j = 0; j < 8; j++)
 565             tmp |= (rc->books[i][j] != -1) << j;
 566
 567         put_bits(pb, 3, tmp & 7);
 568         put_bits(pb, 1, tmp > 7);
 569
 570         if (tmp > 7)
 571             put_bits(pb, 5, tmp >> 3);
 572     }
 573
 574     for (i = 0; i < rc->classifications; i++) {
 575         int j;
 576         for (j = 0; j < 8; j++)
 577             if (rc->books[i][j] != -1)
 578                 put_bits(pb, 8, rc->books[i][j]);
 579     }
 580 }
 581
 582 static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
 583 {
 584     int i;
 585     PutBitContext pb;
 586     uint8_t buffer[50000] = {0}, *p = buffer;
 587     int buffer_len = sizeof buffer;
 588     int len, hlens[3];
 589
 590     // identification header
 591     init_put_bits(&pb, p, buffer_len);
 592     put_bits(&pb, 8, 1); //magic
 593     for (i = 0; "vorbis"[i]; i++)
 594         put_bits(&pb, 8, "vorbis"[i]);
 595     put_bits32(&pb, 0); // version
 596     put_bits(&pb,  8, venc->channels);
 597     put_bits32(&pb, venc->sample_rate);
 598     put_bits32(&pb, 0); // bitrate
 599     put_bits32(&pb, 0); // bitrate
 600     put_bits32(&pb, 0); // bitrate
 601     put_bits(&pb,  4, venc->log2_blocksize[0]);
 602     put_bits(&pb,  4, venc->log2_blocksize[1]);
 603     put_bits(&pb,  1, 1); // framing
 604
 605     flush_put_bits(&pb);
 606     hlens[0] = put_bits_count(&pb) >> 3;
 607     buffer_len -= hlens[0];
 608     p += hlens[0];
 609
 610     // comment header
 611     init_put_bits(&pb, p, buffer_len);
 612     put_bits(&pb, 8, 3); //magic
 613     for (i = 0; "vorbis"[i]; i++)
 614         put_bits(&pb, 8, "vorbis"[i]);
 615     put_bits32(&pb, 0); // vendor length TODO
 616     put_bits32(&pb, 0); // amount of comments
 617     put_bits(&pb,  1, 1); // framing
 618
 619     flush_put_bits(&pb);
 620     hlens[1] = put_bits_count(&pb) >> 3;
 621     buffer_len -= hlens[1];
 622     p += hlens[1];
 623
 624     // setup header
 625     init_put_bits(&pb, p, buffer_len);
 626     put_bits(&pb, 8, 5); //magic
 627     for (i = 0; "vorbis"[i]; i++)
 628         put_bits(&pb, 8, "vorbis"[i]);
 629
 630     // codebooks
 631     put_bits(&pb, 8, venc->ncodebooks - 1);
 632     for (i = 0; i < venc->ncodebooks; i++)
 633         put_codebook_header(&pb, &venc->codebooks[i]);
 634
 635     // time domain, reserved, zero
 636     put_bits(&pb,  6, 0);
 637     put_bits(&pb, 16, 0);
 638
 639     // floors
 640     put_bits(&pb, 6, venc->nfloors - 1);
 641     for (i = 0; i < venc->nfloors; i++)
 642         put_floor_header(&pb, &venc->floors[i]);
 643
 644     // residues
 645     put_bits(&pb, 6, venc->nresidues - 1);
 646     for (i = 0; i < venc->nresidues; i++)
 647         put_residue_header(&pb, &venc->residues[i]);
 648
 649     // mappings
 650     put_bits(&pb, 6, venc->nmappings - 1);
 651     for (i = 0; i < venc->nmappings; i++) {
 652         vorbis_enc_mapping *mc = &venc->mappings[i];
 653         int j;
 654         put_bits(&pb, 16, 0); // mapping type
 655
 656         put_bits(&pb, 1, mc->submaps > 1);
 657         if (mc->submaps > 1)
 658             put_bits(&pb, 4, mc->submaps - 1);
 659
 660         put_bits(&pb, 1, !!mc->coupling_steps);
 661         if (mc->coupling_steps) {
 662             put_bits(&pb, 8, mc->coupling_steps - 1);
 663             for (j = 0; j < mc->coupling_steps; j++) {
 664                 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
 665                 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
 666             }
 667         }
 668
 669         put_bits(&pb, 2, 0); // reserved
 670
 671         if (mc->submaps > 1)
 672             for (j = 0; j < venc->channels; j++)
 673                 put_bits(&pb, 4, mc->mux[j]);
 674
 675         for (j = 0; j < mc->submaps; j++) {
 676             put_bits(&pb, 8, 0); // reserved time configuration
 677             put_bits(&pb, 8, mc->floor[j]);
 678             put_bits(&pb, 8, mc->residue[j]);
 679         }
 680     }
 681
 682     // modes
 683     put_bits(&pb, 6, venc->nmodes - 1);
 684     for (i = 0; i < venc->nmodes; i++) {
 685         put_bits(&pb, 1, venc->modes[i].blockflag);
 686         put_bits(&pb, 16, 0); // reserved window type
 687         put_bits(&pb, 16, 0); // reserved transform type
 688         put_bits(&pb, 8, venc->modes[i].mapping);
 689     }
 690
 691     put_bits(&pb, 1, 1); // framing
 692
 693     flush_put_bits(&pb);
 694     hlens[2] = put_bits_count(&pb) >> 3;
 695
 696     len = hlens[0] + hlens[1] + hlens[2];
 697     p = *out = av_mallocz(64 + len + len/255);
 698     if (!p)
 699         return AVERROR(ENOMEM);
 700
 701     *p++ = 2;
 702     p += av_xiphlacing(p, hlens[0]);
 703     p += av_xiphlacing(p, hlens[1]);
 704     buffer_len = 0;
 705     for (i = 0; i < 3; i++) {
 706         memcpy(p, buffer + buffer_len, hlens[i]);
 707         p += hlens[i];
 708         buffer_len += hlens[i];
 709     }
 710
 711     return p - *out;
 712 }
 713
 714 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
 715 {
 716     int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
 717     int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
 718     int j;
 719     float average = 0;
 720
 721     for (j = begin; j < end; j++)
 722         average += fabs(coeffs[j]);
 723     return average / (end - begin);
 724 }
 725
 726 static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
 727                       float *coeffs, uint16_t *posts, int samples)
 728 {
 729     int range = 255 / fc->multiplier + 1;
 730     int i;
 731     float tot_average = 0.0;
 732     float averages[MAX_FLOOR_VALUES];
 733     for (i = 0; i < fc->values; i++) {
 734         averages[i] = get_floor_average(fc, coeffs, i);
 735         tot_average += averages[i];
 736     }
 737     tot_average /= fc->values;
 738     tot_average /= venc->quality;
 739
 740     for (i = 0; i < fc->values; i++) {
 741         int position  = fc->list[fc->list[i].sort].x;
 742         float average = averages[i];
 743         int j;
 744
 745         average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
 746         for (j = 0; j < range - 1; j++)
 747             if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
 748                 break;
 749         posts[fc->list[i].sort] = j;
 750     }
 751 }
 752
 753 static int render_point(int x0, int y0, int x1, int y1, int x)
 754 {
 755     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
 756 }
 757
 758 static int floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
 759                         PutBitContext *pb, uint16_t *posts,
 760                         float *floor, int samples)
 761 {
 762     int range = 255 / fc->multiplier + 1;
 763     int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
 764     int i, counter;
 765
 766     if (pb->size_in_bits - put_bits_count(pb) < 1 + 2 * ilog(range - 1))
 767         return AVERROR(EINVAL);
 768     put_bits(pb, 1, 1); // non zero
 769     put_bits(pb, ilog(range - 1), posts[0]);
 770     put_bits(pb, ilog(range - 1), posts[1]);
 771     coded[0] = coded[1] = 1;
 772
 773     for (i = 2; i < fc->values; i++) {
 774         int predicted = render_point(fc->list[fc->list[i].low].x,
 775                                      posts[fc->list[i].low],
 776                                      fc->list[fc->list[i].high].x,
 777                                      posts[fc->list[i].high],
 778                                      fc->list[i].x);
 779         int highroom = range - predicted;
 780         int lowroom = predicted;
 781         int room = FFMIN(highroom, lowroom);
 782         if (predicted == posts[i]) {
 783             coded[i] = 0; // must be used later as flag!
 784             continue;
 785         } else {
 786             if (!coded[fc->list[i].low ])
 787                 coded[fc->list[i].low ] = -1;
 788             if (!coded[fc->list[i].high])
 789                 coded[fc->list[i].high] = -1;
 790         }
 791         if (posts[i] > predicted) {
 792             if (posts[i] - predicted > room)
 793                 coded[i] = posts[i] - predicted + lowroom;
 794             else
 795                 coded[i] = (posts[i] - predicted) << 1;
 796         } else {
 797             if (predicted - posts[i] > room)
 798                 coded[i] = predicted - posts[i] + highroom - 1;
 799             else
 800                 coded[i] = ((predicted - posts[i]) << 1) - 1;
 801         }
 802     }
 803
 804     counter = 2;
 805     for (i = 0; i < fc->partitions; i++) {
 806         vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
 807         int k, cval = 0, csub = 1<<c->subclass;
 808         if (c->subclass) {
 809             vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
 810             int cshift = 0;
 811             for (k = 0; k < c->dim; k++) {
 812                 int l;
 813                 for (l = 0; l < csub; l++) {
 814                     int maxval = 1;
 815                     if (c->books[l] != -1)
 816                         maxval = venc->codebooks[c->books[l]].nentries;
 817                     // coded could be -1, but this still works, cause that is 0
 818                     if (coded[counter + k] < maxval)
 819                         break;
 820                 }
 821                 assert(l != csub);
 822                 cval   |= l << cshift;
 823                 cshift += c->subclass;
 824             }
 825             if (put_codeword(pb, book, cval))
 826                 return AVERROR(EINVAL);
 827         }
 828         for (k = 0; k < c->dim; k++) {
 829             int book  = c->books[cval & (csub-1)];
 830             int entry = coded[counter++];
 831             cval >>= c->subclass;
 832             if (book == -1)
 833                 continue;
 834             if (entry == -1)
 835                 entry = 0;
 836             if (put_codeword(pb, &venc->codebooks[book], entry))
 837                 return AVERROR(EINVAL);
 838         }
 839     }
 840
 841     ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
 842                                  fc->multiplier, floor, samples);
 843
 844     return 0;
 845 }
 846
 847 static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
 848                          float *num)
 849 {
 850     int i, entry = -1;
 851     float distance = FLT_MAX;
 852     assert(book->dimensions);
 853     for (i = 0; i < book->nentries; i++) {
 854         float * vec = book->dimensions + i * book->ndimensions, d = book->pow2[i];
 855         int j;
 856         if (!book->lens[i])
 857             continue;
 858         for (j = 0; j < book->ndimensions; j++)
 859             d -= vec[j] * num[j];
 860         if (distance > d) {
 861             entry    = i;
 862             distance = d;
 863         }
 864     }
 865     if (put_codeword(pb, book, entry))
 866         return NULL;
 867     return &book->dimensions[entry * book->ndimensions];
 868 }
 869
 870 static int residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
 871                           PutBitContext *pb, float *coeffs, int samples,
 872                           int real_ch)
 873 {
 874     int pass, i, j, p, k;
 875     int psize      = rc->partition_size;
 876     int partitions = (rc->end - rc->begin) / psize;
 877     int channels   = (rc->type == 2) ? 1 : real_ch;
 878     int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
 879     int classwords = venc->codebooks[rc->classbook].ndimensions;
 880
 881     assert(rc->type == 2);
 882     assert(real_ch == 2);
 883     for (p = 0; p < partitions; p++) {
 884         float max1 = 0.0, max2 = 0.0;
 885         int s = rc->begin + p * psize;
 886         for (k = s; k < s + psize; k += 2) {
 887             max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
 888             max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
 889         }
 890
 891         for (i = 0; i < rc->classifications - 1; i++)
 892             if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
 893                 break;
 894         classes[0][p] = i;
 895     }
 896
 897     for (pass = 0; pass < 8; pass++) {
 898         p = 0;
 899         while (p < partitions) {
 900             if (pass == 0)
 901                 for (j = 0; j < channels; j++) {
 902                     vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
 903                     int entry = 0;
 904                     for (i = 0; i < classwords; i++) {
 905                         entry *= rc->classifications;
 906                         entry += classes[j][p + i];
 907                     }
 908                     if (put_codeword(pb, book, entry))
 909                         return AVERROR(EINVAL);
 910                 }
 911             for (i = 0; i < classwords && p < partitions; i++, p++) {
 912                 for (j = 0; j < channels; j++) {
 913                     int nbook = rc->books[classes[j][p]][pass];
 914                     vorbis_enc_codebook * book = &venc->codebooks[nbook];
 915                     float *buf = coeffs + samples*j + rc->begin + p*psize;
 916                     if (nbook == -1)
 917                         continue;
 918
 919                     assert(rc->type == 0 || rc->type == 2);
 920                     assert(!(psize % book->ndimensions));
 921
 922                     if (rc->type == 0) {
 923                         for (k = 0; k < psize; k += book->ndimensions) {
 924                             int l;
 925                             float *a = put_vector(book, pb, &buf[k]);
 926                             if (!a)
 927                                 return AVERROR(EINVAL);
 928                             for (l = 0; l < book->ndimensions; l++)
 929                                 buf[k + l] -= a[l];
 930                         }
 931                     } else {
 932                         int s = rc->begin + p * psize, a1, b1;
 933                         a1 = (s % real_ch) * samples;
 934                         b1 =  s / real_ch;
 935                         s  = real_ch * samples;
 936                         for (k = 0; k < psize; k += book->ndimensions) {
 937                             int dim, a2 = a1, b2 = b1;
 938                             float vec[MAX_CODEBOOK_DIM], *pv = vec;
 939                             for (dim = book->ndimensions; dim--; ) {
 940                                 *pv++ = coeffs[a2 + b2];
 941                                 if ((a2 += samples) == s) {
 942                                     a2 = 0;
 943                                     b2++;
 944                                 }
 945                             }
 946                             pv = put_vector(book, pb, vec);
 947                             if (!pv)
 948                                 return AVERROR(EINVAL);
 949                             for (dim = book->ndimensions; dim--; ) {
 950                                 coeffs[a1 + b1] -= *pv++;
 951                                 if ((a1 += samples) == s) {
 952                                     a1 = 0;
 953                                     b1++;
 954                                 }
 955                             }
 956                         }
 957                     }
 958                 }
 959             }
 960         }
 961     }
 962     return 0;
 963 }
 964
 965 static int apply_window_and_mdct(vorbis_enc_context *venc,
 966                                  float **audio, int samples)
 967 {
 968     int i, channel;
 969     const float * win = venc->win[0];
 970     int window_len = 1 << (venc->log2_blocksize[0] - 1);
 971     float n = (float)(1 << venc->log2_blocksize[0]) / 4.0;
 972     // FIXME use dsp
 973
 974     if (!venc->have_saved && !samples)
 975         return 0;
 976
 977     if (venc->have_saved) {
 978         for (channel = 0; channel < venc->channels; channel++)
 979             memcpy(venc->samples + channel * window_len * 2,
 980                    venc->saved + channel * window_len, sizeof(float) * window_len);
 981     } else {
 982         for (channel = 0; channel < venc->channels; channel++)
 983             memset(venc->samples + channel * window_len * 2, 0,
 984                    sizeof(float) * window_len);
 985     }
 986
 987     if (samples) {
 988         for (channel = 0; channel < venc->channels; channel++) {
 989             float * offset = venc->samples + channel*window_len*2 + window_len;
 990             for (i = 0; i < samples; i++)
 991                 offset[i] = audio[channel][i] / n * win[window_len - i - 1];
 992         }
 993     } else {
 994         for (channel = 0; channel < venc->channels; channel++)
 995             memset(venc->samples + channel * window_len * 2 + window_len,
 996                    0, sizeof(float) * window_len);
 997     }
 998
 999     for (channel = 0; channel < venc->channels; channel++)
1000         venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
1001                      venc->samples + channel * window_len * 2);
1002
1003     if (samples) {
1004         for (channel = 0; channel < venc->channels; channel++) {
1005             float *offset = venc->saved + channel * window_len;
1006             for (i = 0; i < samples; i++)
1007                 offset[i] = audio[channel][i] / n * win[i];
1008         }
1009         venc->have_saved = 1;
1010     } else {
1011         venc->have_saved = 0;
1012     }
1013     return 1;
1014 }
1015
1016
1017 static int vorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1018                                const AVFrame *frame, int *got_packet_ptr)
1019 {
1020     vorbis_enc_context *venc = avctx->priv_data;
1021     float **audio = frame ? (float **)frame->extended_data : NULL;
1022     int samples = frame ? frame->nb_samples : 0;
1023     vorbis_enc_mode *mode;
1024     vorbis_enc_mapping *mapping;
1025     PutBitContext pb;
1026     int i, ret;
1027
1028     if (!apply_window_and_mdct(venc, audio, samples))
1029         return 0;
1030     samples = 1 << (venc->log2_blocksize[0] - 1);
1031
1032     if ((ret = ff_alloc_packet(avpkt, 8192))) {
1033         av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
1034         return ret;
1035     }
1036
1037     init_put_bits(&pb, avpkt->data, avpkt->size);
1038
1039     if (pb.size_in_bits - put_bits_count(&pb) < 1 + ilog(venc->nmodes - 1)) {
1040         av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1041         return AVERROR(EINVAL);
1042     }
1043
1044     put_bits(&pb, 1, 0); // magic bit
1045
1046     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
1047
1048     mode    = &venc->modes[0];
1049     mapping = &venc->mappings[mode->mapping];
1050     if (mode->blockflag) {
1051         put_bits(&pb, 1, 0);
1052         put_bits(&pb, 1, 0);
1053     }
1054
1055     for (i = 0; i < venc->channels; i++) {
1056         vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
1057         uint16_t posts[MAX_FLOOR_VALUES];
1058         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
1059         if (floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples)) {
1060             av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1061             return AVERROR(EINVAL);
1062         }
1063     }
1064
1065     for (i = 0; i < venc->channels * samples; i++)
1066         venc->coeffs[i] /= venc->floor[i];
1067
1068     for (i = 0; i < mapping->coupling_steps; i++) {
1069         float *mag = venc->coeffs + mapping->magnitude[i] * samples;
1070         float *ang = venc->coeffs + mapping->angle[i]     * samples;
1071         int j;
1072         for (j = 0; j < samples; j++) {
1073             float a = ang[j];
1074             ang[j] -= mag[j];
1075             if (mag[j] > 0)
1076                 ang[j] = -ang[j];
1077             if (ang[j] < 0)
1078                 mag[j] = a;
1079         }
1080     }
1081
1082     if (residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
1083                        &pb, venc->coeffs, samples, venc->channels)) {
1084         av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1085         return AVERROR(EINVAL);
1086     }
1087
1088     flush_put_bits(&pb);
1089     avpkt->size = put_bits_count(&pb) >> 3;
1090
1091     avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size);
1092     if (frame)
1093         if (frame->pts != AV_NOPTS_VALUE)
1094             avpkt->pts = ff_samples_to_time_base(avctx, frame->pts);
1095     else
1096         avpkt->pts = venc->next_pts;
1097     if (avpkt->pts != AV_NOPTS_VALUE)
1098         venc->next_pts = avpkt->pts + avpkt->duration;
1099
1100     *got_packet_ptr = 1;
1101     return 0;
1102 }
1103
1104
1105 static av_cold int vorbis_encode_close(AVCodecContext *avctx)
1106 {
1107     vorbis_enc_context *venc = avctx->priv_data;
1108     int i;
1109
1110     if (venc->codebooks)
1111         for (i = 0; i < venc->ncodebooks; i++) {
1112             av_freep(&venc->codebooks[i].lens);
1113             av_freep(&venc->codebooks[i].codewords);
1114             av_freep(&venc->codebooks[i].quantlist);
1115             av_freep(&venc->codebooks[i].dimensions);
1116             av_freep(&venc->codebooks[i].pow2);
1117         }
1118     av_freep(&venc->codebooks);
1119
1120     if (venc->floors)
1121         for (i = 0; i < venc->nfloors; i++) {
1122             int j;
1123             if (venc->floors[i].classes)
1124                 for (j = 0; j < venc->floors[i].nclasses; j++)
1125                     av_freep(&venc->floors[i].classes[j].books);
1126             av_freep(&venc->floors[i].classes);
1127             av_freep(&venc->floors[i].partition_to_class);
1128             av_freep(&venc->floors[i].list);
1129         }
1130     av_freep(&venc->floors);
1131
1132     if (venc->residues)
1133         for (i = 0; i < venc->nresidues; i++) {
1134             av_freep(&venc->residues[i].books);
1135             av_freep(&venc->residues[i].maxes);
1136         }
1137     av_freep(&venc->residues);
1138
1139     if (venc->mappings)
1140         for (i = 0; i < venc->nmappings; i++) {
1141             av_freep(&venc->mappings[i].mux);
1142             av_freep(&venc->mappings[i].floor);
1143             av_freep(&venc->mappings[i].residue);
1144             av_freep(&venc->mappings[i].magnitude);
1145             av_freep(&venc->mappings[i].angle);
1146         }
1147     av_freep(&venc->mappings);
1148
1149     av_freep(&venc->modes);
1150
1151     av_freep(&venc->saved);
1152     av_freep(&venc->samples);
1153     av_freep(&venc->floor);
1154     av_freep(&venc->coeffs);
1155
1156     ff_mdct_end(&venc->mdct[0]);
1157     ff_mdct_end(&venc->mdct[1]);
1158
1159     av_freep(&avctx->extradata);
1160
1161     return 0 ;
1162 }
1163
1164 static av_cold int vorbis_encode_init(AVCodecContext *avctx)
1165 {
1166     vorbis_enc_context *venc = avctx->priv_data;
1167     int ret;
1168
1169     if (avctx->channels != 2) {
1170         av_log(avctx, AV_LOG_ERROR, "Current Libav Vorbis encoder only supports 2 channels.\n");
1171         return -1;
1172     }
1173
1174     if ((ret = create_vorbis_context(venc, avctx)) < 0)
1175         goto error;
1176
1177     avctx->bit_rate = 0;
1178     if (avctx->flags & CODEC_FLAG_QSCALE)
1179         venc->quality = avctx->global_quality / (float)FF_QP2LAMBDA;
1180     else
1181         venc->quality = 3.0;
1182     venc->quality *= venc->quality;
1183
1184     if ((ret = put_main_header(venc, (uint8_t**)&avctx->extradata)) < 0)
1185         goto error;
1186     avctx->extradata_size = ret;
1187
1188     avctx->frame_size = 1 << (venc->log2_blocksize[0] - 1);
1189
1190     return 0;
1191 error:
1192     vorbis_encode_close(avctx);
1193     return ret;
1194 }
1195
1196 AVCodec ff_vorbis_encoder = {
1197     .name           = "vorbis",
1198     .type           = AVMEDIA_TYPE_AUDIO,
1199     .id             = AV_CODEC_ID_VORBIS,
1200     .priv_data_size = sizeof(vorbis_enc_context),
1201     .init           = vorbis_encode_init,
1202     .encode2        = vorbis_encode_frame,
1203     .close          = vorbis_encode_close,
1204     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
1205     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
1206                                                      AV_SAMPLE_FMT_NONE },
1207     .long_name      = NULL_IF_CONFIG_SMALL("Vorbis"),
1208 };