vorbisenc.c
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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 
27 #include <float.h>
28 #include "avcodec.h"
29 #include "dsputil.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;
45  float min;
46  float delta;
47  int seq_p;
48  int lookup;
49  int *quantlist;
50  float *dimentions;
51  float *pow2;
53 
54 typedef struct {
55  int dim;
56  int subclass;
58  int *books;
60 
61 typedef struct {
64  int nclasses;
67  int rangebits;
68  int values;
71 
72 typedef struct {
73  int type;
74  int begin;
75  int end;
78  int classbook;
79  int8_t (*books)[8];
80  float (*maxes)[2];
82 
83 typedef struct {
84  int submaps;
85  int *mux;
86  int *floor;
87  int *residue;
89  int *magnitude;
90  int *angle;
92 
93 typedef struct {
94  int blockflag;
95  int mapping;
97 
98 typedef struct {
99  int channels;
101  int log2_blocksize[2];
102  FFTContext mdct[2];
103  const float *win[2];
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 
113 
114  int nfloors;
116 
119 
122 
123  int nmodes;
125 
126  int64_t sample_count;
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 void 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  put_bits(pb, cb->lens[entry], cb->codewords[entry]);
147 }
148 
149 static int cb_lookup_vals(int lookup, int dimentions, int entries)
150 {
151  if (lookup == 1)
152  return ff_vorbis_nth_root(entries, dimentions);
153  else if (lookup == 2)
154  return dimentions *entries;
155  return 0;
156 }
157 
159 {
160  int i;
161 
162  ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
163 
164  if (!cb->lookup) {
165  cb->pow2 = cb->dimentions = NULL;
166  } else {
167  int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
168  cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
169  cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
170  if (!cb->dimentions || !cb->pow2)
171  return AVERROR(ENOMEM);
172  for (i = 0; i < cb->nentries; i++) {
173  float last = 0;
174  int j;
175  int div = 1;
176  for (j = 0; j < cb->ndimentions; j++) {
177  int off;
178  if (cb->lookup == 1)
179  off = (i / div) % vals; // lookup type 1
180  else
181  off = i * cb->ndimentions + j; // lookup type 2
182 
183  cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
184  if (cb->seq_p)
185  last = cb->dimentions[i * cb->ndimentions + j];
186  cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
187  div *= vals;
188  }
189  cb->pow2[i] /= 2.;
190  }
191  }
192  return 0;
193 }
194 
196 {
197  int i;
198  assert(rc->type == 2);
199  rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
200  if (!rc->maxes)
201  return AVERROR(ENOMEM);
202  for (i = 0; i < rc->classifications; i++) {
203  int j;
204  vorbis_enc_codebook * cb;
205  for (j = 0; j < 8; j++)
206  if (rc->books[i][j] != -1)
207  break;
208  if (j == 8) // zero
209  continue;
210  cb = &venc->codebooks[rc->books[i][j]];
211  assert(cb->ndimentions >= 2);
212  assert(cb->lookup);
213 
214  for (j = 0; j < cb->nentries; j++) {
215  float a;
216  if (!cb->lens[j])
217  continue;
218  a = fabs(cb->dimentions[j * cb->ndimentions]);
219  if (a > rc->maxes[i][0])
220  rc->maxes[i][0] = a;
221  a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
222  if (a > rc->maxes[i][1])
223  rc->maxes[i][1] = a;
224  }
225  }
226  // small bias
227  for (i = 0; i < rc->classifications; i++) {
228  rc->maxes[i][0] += 0.8;
229  rc->maxes[i][1] += 0.8;
230  }
231  return 0;
232 }
233 
235  AVCodecContext *avccontext)
236 {
237  vorbis_enc_floor *fc;
238  vorbis_enc_residue *rc;
239  vorbis_enc_mapping *mc;
240  int i, book, ret;
241 
242  venc->channels = avccontext->channels;
243  venc->sample_rate = avccontext->sample_rate;
244  venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
245 
247  venc->codebooks = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
248  if (!venc->codebooks)
249  return AVERROR(ENOMEM);
250 
251  // codebook 0..14 - floor1 book, values 0..255
252  // codebook 15 residue masterbook
253  // codebook 16..29 residue
254  for (book = 0; book < venc->ncodebooks; book++) {
255  vorbis_enc_codebook *cb = &venc->codebooks[book];
256  int vals;
257  cb->ndimentions = cvectors[book].dim;
258  cb->nentries = cvectors[book].real_len;
259  cb->min = cvectors[book].min;
260  cb->delta = cvectors[book].delta;
261  cb->lookup = cvectors[book].lookup;
262  cb->seq_p = 0;
263 
264  cb->lens = av_malloc(sizeof(uint8_t) * cb->nentries);
265  cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
266  if (!cb->lens || !cb->codewords)
267  return AVERROR(ENOMEM);
268  memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
269  memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
270 
271  if (cb->lookup) {
272  vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
273  cb->quantlist = av_malloc(sizeof(int) * vals);
274  if (!cb->quantlist)
275  return AVERROR(ENOMEM);
276  for (i = 0; i < vals; i++)
277  cb->quantlist[i] = cvectors[book].quant[i];
278  } else {
279  cb->quantlist = NULL;
280  }
281  if ((ret = ready_codebook(cb)) < 0)
282  return ret;
283  }
284 
285  venc->nfloors = 1;
286  venc->floors = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
287  if (!venc->floors)
288  return AVERROR(ENOMEM);
289 
290  // just 1 floor
291  fc = &venc->floors[0];
293  fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
294  if (!fc->partition_to_class)
295  return AVERROR(ENOMEM);
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(vorbis_enc_floor_class) * fc->nclasses);
304  if (!fc->classes)
305  return AVERROR(ENOMEM);
306  for (i = 0; i < fc->nclasses; i++) {
307  vorbis_enc_floor_class * c = &fc->classes[i];
308  int j, books;
309  c->dim = floor_classes[i].dim;
310  c->subclass = floor_classes[i].subclass;
311  c->masterbook = floor_classes[i].masterbook;
312  books = (1 << c->subclass);
313  c->books = av_malloc(sizeof(int) * books);
314  if (!c->books)
315  return AVERROR(ENOMEM);
316  for (j = 0; j < books; j++)
317  c->books[j] = floor_classes[i].nbooks[j];
318  }
319  fc->multiplier = 2;
320  fc->rangebits = venc->log2_blocksize[0] - 1;
321 
322  fc->values = 2;
323  for (i = 0; i < fc->partitions; i++)
324  fc->values += fc->classes[fc->partition_to_class[i]].dim;
325 
326  fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
327  if (!fc->list)
328  return AVERROR(ENOMEM);
329  fc->list[0].x = 0;
330  fc->list[1].x = 1 << fc->rangebits;
331  for (i = 2; i < fc->values; i++) {
332  static const int a[] = {
333  93, 23,372, 6, 46,186,750, 14, 33, 65,
334  130,260,556, 3, 10, 18, 28, 39, 55, 79,
335  111,158,220,312,464,650,850
336  };
337  fc->list[i].x = a[i - 2];
338  }
339  if (ff_vorbis_ready_floor1_list(avccontext, fc->list, fc->values))
340  return AVERROR_BUG;
341 
342  venc->nresidues = 1;
343  venc->residues = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
344  if (!venc->residues)
345  return AVERROR(ENOMEM);
346 
347  // single residue
348  rc = &venc->residues[0];
349  rc->type = 2;
350  rc->begin = 0;
351  rc->end = 1600;
352  rc->partition_size = 32;
353  rc->classifications = 10;
354  rc->classbook = 15;
355  rc->books = av_malloc(sizeof(*rc->books) * rc->classifications);
356  if (!rc->books)
357  return AVERROR(ENOMEM);
358  {
359  static const int8_t a[10][8] = {
360  { -1, -1, -1, -1, -1, -1, -1, -1, },
361  { -1, -1, 16, -1, -1, -1, -1, -1, },
362  { -1, -1, 17, -1, -1, -1, -1, -1, },
363  { -1, -1, 18, -1, -1, -1, -1, -1, },
364  { -1, -1, 19, -1, -1, -1, -1, -1, },
365  { -1, -1, 20, -1, -1, -1, -1, -1, },
366  { -1, -1, 21, -1, -1, -1, -1, -1, },
367  { 22, 23, -1, -1, -1, -1, -1, -1, },
368  { 24, 25, -1, -1, -1, -1, -1, -1, },
369  { 26, 27, 28, -1, -1, -1, -1, -1, },
370  };
371  memcpy(rc->books, a, sizeof a);
372  }
373  if ((ret = ready_residue(rc, venc)) < 0)
374  return ret;
375 
376  venc->nmappings = 1;
377  venc->mappings = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
378  if (!venc->mappings)
379  return AVERROR(ENOMEM);
380 
381  // single mapping
382  mc = &venc->mappings[0];
383  mc->submaps = 1;
384  mc->mux = av_malloc(sizeof(int) * venc->channels);
385  if (!mc->mux)
386  return AVERROR(ENOMEM);
387  for (i = 0; i < venc->channels; i++)
388  mc->mux[i] = 0;
389  mc->floor = av_malloc(sizeof(int) * mc->submaps);
390  mc->residue = av_malloc(sizeof(int) * mc->submaps);
391  if (!mc->floor || !mc->residue)
392  return AVERROR(ENOMEM);
393  for (i = 0; i < mc->submaps; i++) {
394  mc->floor[i] = 0;
395  mc->residue[i] = 0;
396  }
397  mc->coupling_steps = venc->channels == 2 ? 1 : 0;
398  mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps);
399  mc->angle = av_malloc(sizeof(int) * mc->coupling_steps);
400  if (!mc->magnitude || !mc->angle)
401  return AVERROR(ENOMEM);
402  if (mc->coupling_steps) {
403  mc->magnitude[0] = 0;
404  mc->angle[0] = 1;
405  }
406 
407  venc->nmodes = 1;
408  venc->modes = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
409  if (!venc->modes)
410  return AVERROR(ENOMEM);
411 
412  // single mode
413  venc->modes[0].blockflag = 0;
414  venc->modes[0].mapping = 0;
415 
416  venc->have_saved = 0;
417  venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
418  venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
419  venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
420  venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
421  if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs)
422  return AVERROR(ENOMEM);
423 
424  venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
425  venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
426 
427  if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)
428  return ret;
429  if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)
430  return ret;
431 
432  return 0;
433 }
434 
435 static void put_float(PutBitContext *pb, float f)
436 {
437  int exp, mant;
438  uint32_t res = 0;
439  mant = (int)ldexp(frexp(f, &exp), 20);
440  exp += 788 - 20;
441  if (mant < 0) {
442  res |= (1U << 31);
443  mant = -mant;
444  }
445  res |= mant | (exp << 21);
446  put_bits32(pb, res);
447 }
448 
450 {
451  int i;
452  int ordered = 0;
453 
454  put_bits(pb, 24, 0x564342); //magic
455  put_bits(pb, 16, cb->ndimentions);
456  put_bits(pb, 24, cb->nentries);
457 
458  for (i = 1; i < cb->nentries; i++)
459  if (cb->lens[i] < cb->lens[i-1])
460  break;
461  if (i == cb->nentries)
462  ordered = 1;
463 
464  put_bits(pb, 1, ordered);
465  if (ordered) {
466  int len = cb->lens[0];
467  put_bits(pb, 5, len - 1);
468  i = 0;
469  while (i < cb->nentries) {
470  int j;
471  for (j = 0; j+i < cb->nentries; j++)
472  if (cb->lens[j+i] != len)
473  break;
474  put_bits(pb, ilog(cb->nentries - i), j);
475  i += j;
476  len++;
477  }
478  } else {
479  int sparse = 0;
480  for (i = 0; i < cb->nentries; i++)
481  if (!cb->lens[i])
482  break;
483  if (i != cb->nentries)
484  sparse = 1;
485  put_bits(pb, 1, sparse);
486 
487  for (i = 0; i < cb->nentries; i++) {
488  if (sparse)
489  put_bits(pb, 1, !!cb->lens[i]);
490  if (cb->lens[i])
491  put_bits(pb, 5, cb->lens[i] - 1);
492  }
493  }
494 
495  put_bits(pb, 4, cb->lookup);
496  if (cb->lookup) {
497  int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
498  int bits = ilog(cb->quantlist[0]);
499 
500  for (i = 1; i < tmp; i++)
501  bits = FFMAX(bits, ilog(cb->quantlist[i]));
502 
503  put_float(pb, cb->min);
504  put_float(pb, cb->delta);
505 
506  put_bits(pb, 4, bits - 1);
507  put_bits(pb, 1, cb->seq_p);
508 
509  for (i = 0; i < tmp; i++)
510  put_bits(pb, bits, cb->quantlist[i]);
511  }
512 }
513 
515 {
516  int i;
517 
518  put_bits(pb, 16, 1); // type, only floor1 is supported
519 
520  put_bits(pb, 5, fc->partitions);
521 
522  for (i = 0; i < fc->partitions; i++)
523  put_bits(pb, 4, fc->partition_to_class[i]);
524 
525  for (i = 0; i < fc->nclasses; i++) {
526  int j, books;
527 
528  put_bits(pb, 3, fc->classes[i].dim - 1);
529  put_bits(pb, 2, fc->classes[i].subclass);
530 
531  if (fc->classes[i].subclass)
532  put_bits(pb, 8, fc->classes[i].masterbook);
533 
534  books = (1 << fc->classes[i].subclass);
535 
536  for (j = 0; j < books; j++)
537  put_bits(pb, 8, fc->classes[i].books[j] + 1);
538  }
539 
540  put_bits(pb, 2, fc->multiplier - 1);
541  put_bits(pb, 4, fc->rangebits);
542 
543  for (i = 2; i < fc->values; i++)
544  put_bits(pb, fc->rangebits, fc->list[i].x);
545 }
546 
548 {
549  int i;
550 
551  put_bits(pb, 16, rc->type);
552 
553  put_bits(pb, 24, rc->begin);
554  put_bits(pb, 24, rc->end);
555  put_bits(pb, 24, rc->partition_size - 1);
556  put_bits(pb, 6, rc->classifications - 1);
557  put_bits(pb, 8, rc->classbook);
558 
559  for (i = 0; i < rc->classifications; i++) {
560  int j, tmp = 0;
561  for (j = 0; j < 8; j++)
562  tmp |= (rc->books[i][j] != -1) << j;
563 
564  put_bits(pb, 3, tmp & 7);
565  put_bits(pb, 1, tmp > 7);
566 
567  if (tmp > 7)
568  put_bits(pb, 5, tmp >> 3);
569  }
570 
571  for (i = 0; i < rc->classifications; i++) {
572  int j;
573  for (j = 0; j < 8; j++)
574  if (rc->books[i][j] != -1)
575  put_bits(pb, 8, rc->books[i][j]);
576  }
577 }
578 
579 static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
580 {
581  int i;
582  PutBitContext pb;
583  uint8_t buffer[50000] = {0}, *p = buffer;
584  int buffer_len = sizeof buffer;
585  int len, hlens[3];
586 
587  // identification header
588  init_put_bits(&pb, p, buffer_len);
589  put_bits(&pb, 8, 1); //magic
590  for (i = 0; "vorbis"[i]; i++)
591  put_bits(&pb, 8, "vorbis"[i]);
592  put_bits32(&pb, 0); // version
593  put_bits(&pb, 8, venc->channels);
594  put_bits32(&pb, venc->sample_rate);
595  put_bits32(&pb, 0); // bitrate
596  put_bits32(&pb, 0); // bitrate
597  put_bits32(&pb, 0); // bitrate
598  put_bits(&pb, 4, venc->log2_blocksize[0]);
599  put_bits(&pb, 4, venc->log2_blocksize[1]);
600  put_bits(&pb, 1, 1); // framing
601 
602  flush_put_bits(&pb);
603  hlens[0] = put_bits_count(&pb) >> 3;
604  buffer_len -= hlens[0];
605  p += hlens[0];
606 
607  // comment header
608  init_put_bits(&pb, p, buffer_len);
609  put_bits(&pb, 8, 3); //magic
610  for (i = 0; "vorbis"[i]; i++)
611  put_bits(&pb, 8, "vorbis"[i]);
612  put_bits32(&pb, 0); // vendor length TODO
613  put_bits32(&pb, 0); // amount of comments
614  put_bits(&pb, 1, 1); // framing
615 
616  flush_put_bits(&pb);
617  hlens[1] = put_bits_count(&pb) >> 3;
618  buffer_len -= hlens[1];
619  p += hlens[1];
620 
621  // setup header
622  init_put_bits(&pb, p, buffer_len);
623  put_bits(&pb, 8, 5); //magic
624  for (i = 0; "vorbis"[i]; i++)
625  put_bits(&pb, 8, "vorbis"[i]);
626 
627  // codebooks
628  put_bits(&pb, 8, venc->ncodebooks - 1);
629  for (i = 0; i < venc->ncodebooks; i++)
630  put_codebook_header(&pb, &venc->codebooks[i]);
631 
632  // time domain, reserved, zero
633  put_bits(&pb, 6, 0);
634  put_bits(&pb, 16, 0);
635 
636  // floors
637  put_bits(&pb, 6, venc->nfloors - 1);
638  for (i = 0; i < venc->nfloors; i++)
639  put_floor_header(&pb, &venc->floors[i]);
640 
641  // residues
642  put_bits(&pb, 6, venc->nresidues - 1);
643  for (i = 0; i < venc->nresidues; i++)
644  put_residue_header(&pb, &venc->residues[i]);
645 
646  // mappings
647  put_bits(&pb, 6, venc->nmappings - 1);
648  for (i = 0; i < venc->nmappings; i++) {
649  vorbis_enc_mapping *mc = &venc->mappings[i];
650  int j;
651  put_bits(&pb, 16, 0); // mapping type
652 
653  put_bits(&pb, 1, mc->submaps > 1);
654  if (mc->submaps > 1)
655  put_bits(&pb, 4, mc->submaps - 1);
656 
657  put_bits(&pb, 1, !!mc->coupling_steps);
658  if (mc->coupling_steps) {
659  put_bits(&pb, 8, mc->coupling_steps - 1);
660  for (j = 0; j < mc->coupling_steps; j++) {
661  put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
662  put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
663  }
664  }
665 
666  put_bits(&pb, 2, 0); // reserved
667 
668  if (mc->submaps > 1)
669  for (j = 0; j < venc->channels; j++)
670  put_bits(&pb, 4, mc->mux[j]);
671 
672  for (j = 0; j < mc->submaps; j++) {
673  put_bits(&pb, 8, 0); // reserved time configuration
674  put_bits(&pb, 8, mc->floor[j]);
675  put_bits(&pb, 8, mc->residue[j]);
676  }
677  }
678 
679  // modes
680  put_bits(&pb, 6, venc->nmodes - 1);
681  for (i = 0; i < venc->nmodes; i++) {
682  put_bits(&pb, 1, venc->modes[i].blockflag);
683  put_bits(&pb, 16, 0); // reserved window type
684  put_bits(&pb, 16, 0); // reserved transform type
685  put_bits(&pb, 8, venc->modes[i].mapping);
686  }
687 
688  put_bits(&pb, 1, 1); // framing
689 
690  flush_put_bits(&pb);
691  hlens[2] = put_bits_count(&pb) >> 3;
692 
693  len = hlens[0] + hlens[1] + hlens[2];
694  p = *out = av_mallocz(64 + len + len/255);
695  if (!p)
696  return AVERROR(ENOMEM);
697 
698  *p++ = 2;
699  p += av_xiphlacing(p, hlens[0]);
700  p += av_xiphlacing(p, hlens[1]);
701  buffer_len = 0;
702  for (i = 0; i < 3; i++) {
703  memcpy(p, buffer + buffer_len, hlens[i]);
704  p += hlens[i];
705  buffer_len += hlens[i];
706  }
707 
708  return p - *out;
709 }
710 
711 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
712 {
713  int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
714  int end = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
715  int j;
716  float average = 0;
717 
718  for (j = begin; j < end; j++)
719  average += fabs(coeffs[j]);
720  return average / (end - begin);
721 }
722 
724  float *coeffs, uint16_t *posts, int samples)
725 {
726  int range = 255 / fc->multiplier + 1;
727  int i;
728  float tot_average = 0.;
729  float averages[MAX_FLOOR_VALUES];
730  for (i = 0; i < fc->values; i++) {
731  averages[i] = get_floor_average(fc, coeffs, i);
732  tot_average += averages[i];
733  }
734  tot_average /= fc->values;
735  tot_average /= venc->quality;
736 
737  for (i = 0; i < fc->values; i++) {
738  int position = fc->list[fc->list[i].sort].x;
739  float average = averages[i];
740  int j;
741 
742  average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
743  for (j = 0; j < range - 1; j++)
744  if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
745  break;
746  posts[fc->list[i].sort] = j;
747  }
748 }
749 
750 static int render_point(int x0, int y0, int x1, int y1, int x)
751 {
752  return y0 + (x - x0) * (y1 - y0) / (x1 - x0);
753 }
754 
756  PutBitContext *pb, uint16_t *posts,
757  float *floor, int samples)
758 {
759  int range = 255 / fc->multiplier + 1;
760  int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
761  int i, counter;
762 
763  put_bits(pb, 1, 1); // non zero
764  put_bits(pb, ilog(range - 1), posts[0]);
765  put_bits(pb, ilog(range - 1), posts[1]);
766  coded[0] = coded[1] = 1;
767 
768  for (i = 2; i < fc->values; i++) {
769  int predicted = render_point(fc->list[fc->list[i].low].x,
770  posts[fc->list[i].low],
771  fc->list[fc->list[i].high].x,
772  posts[fc->list[i].high],
773  fc->list[i].x);
774  int highroom = range - predicted;
775  int lowroom = predicted;
776  int room = FFMIN(highroom, lowroom);
777  if (predicted == posts[i]) {
778  coded[i] = 0; // must be used later as flag!
779  continue;
780  } else {
781  if (!coded[fc->list[i].low ])
782  coded[fc->list[i].low ] = -1;
783  if (!coded[fc->list[i].high])
784  coded[fc->list[i].high] = -1;
785  }
786  if (posts[i] > predicted) {
787  if (posts[i] - predicted > room)
788  coded[i] = posts[i] - predicted + lowroom;
789  else
790  coded[i] = (posts[i] - predicted) << 1;
791  } else {
792  if (predicted - posts[i] > room)
793  coded[i] = predicted - posts[i] + highroom - 1;
794  else
795  coded[i] = ((predicted - posts[i]) << 1) - 1;
796  }
797  }
798 
799  counter = 2;
800  for (i = 0; i < fc->partitions; i++) {
802  int k, cval = 0, csub = 1<<c->subclass;
803  if (c->subclass) {
804  vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
805  int cshift = 0;
806  for (k = 0; k < c->dim; k++) {
807  int l;
808  for (l = 0; l < csub; l++) {
809  int maxval = 1;
810  if (c->books[l] != -1)
811  maxval = venc->codebooks[c->books[l]].nentries;
812  // coded could be -1, but this still works, cause that is 0
813  if (coded[counter + k] < maxval)
814  break;
815  }
816  assert(l != csub);
817  cval |= l << cshift;
818  cshift += c->subclass;
819  }
820  put_codeword(pb, book, cval);
821  }
822  for (k = 0; k < c->dim; k++) {
823  int book = c->books[cval & (csub-1)];
824  int entry = coded[counter++];
825  cval >>= c->subclass;
826  if (book == -1)
827  continue;
828  if (entry == -1)
829  entry = 0;
830  put_codeword(pb, &venc->codebooks[book], entry);
831  }
832  }
833 
834  ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
835  fc->multiplier, floor, samples);
836 }
837 
839  float *num)
840 {
841  int i, entry = -1;
842  float distance = FLT_MAX;
843  assert(book->dimentions);
844  for (i = 0; i < book->nentries; i++) {
845  float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
846  int j;
847  if (!book->lens[i])
848  continue;
849  for (j = 0; j < book->ndimentions; j++)
850  d -= vec[j] * num[j];
851  if (distance > d) {
852  entry = i;
853  distance = d;
854  }
855  }
856  put_codeword(pb, book, entry);
857  return &book->dimentions[entry * book->ndimentions];
858 }
859 
861  PutBitContext *pb, float *coeffs, int samples,
862  int real_ch)
863 {
864  int pass, i, j, p, k;
865  int psize = rc->partition_size;
866  int partitions = (rc->end - rc->begin) / psize;
867  int channels = (rc->type == 2) ? 1 : real_ch;
868  int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
869  int classwords = venc->codebooks[rc->classbook].ndimentions;
870 
871  assert(rc->type == 2);
872  assert(real_ch == 2);
873  for (p = 0; p < partitions; p++) {
874  float max1 = 0., max2 = 0.;
875  int s = rc->begin + p * psize;
876  for (k = s; k < s + psize; k += 2) {
877  max1 = FFMAX(max1, fabs(coeffs[ k / real_ch]));
878  max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
879  }
880 
881  for (i = 0; i < rc->classifications - 1; i++)
882  if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
883  break;
884  classes[0][p] = i;
885  }
886 
887  for (pass = 0; pass < 8; pass++) {
888  p = 0;
889  while (p < partitions) {
890  if (pass == 0)
891  for (j = 0; j < channels; j++) {
892  vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
893  int entry = 0;
894  for (i = 0; i < classwords; i++) {
895  entry *= rc->classifications;
896  entry += classes[j][p + i];
897  }
898  put_codeword(pb, book, entry);
899  }
900  for (i = 0; i < classwords && p < partitions; i++, p++) {
901  for (j = 0; j < channels; j++) {
902  int nbook = rc->books[classes[j][p]][pass];
903  vorbis_enc_codebook * book = &venc->codebooks[nbook];
904  float *buf = coeffs + samples*j + rc->begin + p*psize;
905  if (nbook == -1)
906  continue;
907 
908  assert(rc->type == 0 || rc->type == 2);
909  assert(!(psize % book->ndimentions));
910 
911  if (rc->type == 0) {
912  for (k = 0; k < psize; k += book->ndimentions) {
913  float *a = put_vector(book, pb, &buf[k]);
914  int l;
915  for (l = 0; l < book->ndimentions; l++)
916  buf[k + l] -= a[l];
917  }
918  } else {
919  int s = rc->begin + p * psize, a1, b1;
920  a1 = (s % real_ch) * samples;
921  b1 = s / real_ch;
922  s = real_ch * samples;
923  for (k = 0; k < psize; k += book->ndimentions) {
924  int dim, a2 = a1, b2 = b1;
925  float vec[MAX_CODEBOOK_DIM], *pv = vec;
926  for (dim = book->ndimentions; dim--; ) {
927  *pv++ = coeffs[a2 + b2];
928  if ((a2 += samples) == s) {
929  a2 = 0;
930  b2++;
931  }
932  }
933  pv = put_vector(book, pb, vec);
934  for (dim = book->ndimentions; dim--; ) {
935  coeffs[a1 + b1] -= *pv++;
936  if ((a1 += samples) == s) {
937  a1 = 0;
938  b1++;
939  }
940  }
941  }
942  }
943  }
944  }
945  }
946  }
947 }
948 
949 static int apply_window_and_mdct(vorbis_enc_context *venc, const signed short *audio,
950  int samples)
951 {
952  int i, j, channel;
953  const float * win = venc->win[0];
954  int window_len = 1 << (venc->log2_blocksize[0] - 1);
955  float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
956  // FIXME use dsp
957 
958  if (!venc->have_saved && !samples)
959  return 0;
960 
961  if (venc->have_saved) {
962  for (channel = 0; channel < venc->channels; channel++)
963  memcpy(venc->samples + channel * window_len * 2,
964  venc->saved + channel * window_len, sizeof(float) * window_len);
965  } else {
966  for (channel = 0; channel < venc->channels; channel++)
967  memset(venc->samples + channel * window_len * 2, 0,
968  sizeof(float) * window_len);
969  }
970 
971  if (samples) {
972  for (channel = 0; channel < venc->channels; channel++) {
973  float * offset = venc->samples + channel*window_len*2 + window_len;
974  j = channel;
975  for (i = 0; i < samples; i++, j += venc->channels)
976  offset[i] = audio[j] / 32768. / n * win[window_len - i - 1];
977  }
978  } else {
979  for (channel = 0; channel < venc->channels; channel++)
980  memset(venc->samples + channel * window_len * 2 + window_len,
981  0, sizeof(float) * window_len);
982  }
983 
984  for (channel = 0; channel < venc->channels; channel++)
985  venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
986  venc->samples + channel * window_len * 2);
987 
988  if (samples) {
989  for (channel = 0; channel < venc->channels; channel++) {
990  float *offset = venc->saved + channel * window_len;
991  j = channel;
992  for (i = 0; i < samples; i++, j += venc->channels)
993  offset[i] = audio[j] / 32768. / n * win[i];
994  }
995  venc->have_saved = 1;
996  } else {
997  venc->have_saved = 0;
998  }
999  return 1;
1000 }
1001 
1002 
1003 static int vorbis_encode_frame(AVCodecContext *avccontext,
1004  unsigned char *packets,
1005  int buf_size, void *data)
1006 {
1007  vorbis_enc_context *venc = avccontext->priv_data;
1008  const signed short *audio = data;
1009  int samples = data ? avccontext->frame_size : 0;
1010  vorbis_enc_mode *mode;
1011  vorbis_enc_mapping *mapping;
1012  PutBitContext pb;
1013  int i;
1014 
1015  if (!apply_window_and_mdct(venc, audio, samples))
1016  return 0;
1017  samples = 1 << (venc->log2_blocksize[0] - 1);
1018 
1019  init_put_bits(&pb, packets, buf_size);
1020 
1021  put_bits(&pb, 1, 0); // magic bit
1022 
1023  put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
1024 
1025  mode = &venc->modes[0];
1026  mapping = &venc->mappings[mode->mapping];
1027  if (mode->blockflag) {
1028  put_bits(&pb, 1, 0);
1029  put_bits(&pb, 1, 0);
1030  }
1031 
1032  for (i = 0; i < venc->channels; i++) {
1033  vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
1034  uint16_t posts[MAX_FLOOR_VALUES];
1035  floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
1036  floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
1037  }
1038 
1039  for (i = 0; i < venc->channels * samples; i++)
1040  venc->coeffs[i] /= venc->floor[i];
1041 
1042  for (i = 0; i < mapping->coupling_steps; i++) {
1043  float *mag = venc->coeffs + mapping->magnitude[i] * samples;
1044  float *ang = venc->coeffs + mapping->angle[i] * samples;
1045  int j;
1046  for (j = 0; j < samples; j++) {
1047  float a = ang[j];
1048  ang[j] -= mag[j];
1049  if (mag[j] > 0)
1050  ang[j] = -ang[j];
1051  if (ang[j] < 0)
1052  mag[j] = a;
1053  }
1054  }
1055 
1056  residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
1057  &pb, venc->coeffs, samples, venc->channels);
1058 
1059  avccontext->coded_frame->pts = venc->sample_count;
1060  venc->sample_count += avccontext->frame_size;
1061  flush_put_bits(&pb);
1062  return put_bits_count(&pb) >> 3;
1063 }
1064 
1065 
1067 {
1068  vorbis_enc_context *venc = avccontext->priv_data;
1069  int i;
1070 
1071  if (venc->codebooks)
1072  for (i = 0; i < venc->ncodebooks; i++) {
1073  av_freep(&venc->codebooks[i].lens);
1074  av_freep(&venc->codebooks[i].codewords);
1075  av_freep(&venc->codebooks[i].quantlist);
1076  av_freep(&venc->codebooks[i].dimentions);
1077  av_freep(&venc->codebooks[i].pow2);
1078  }
1079  av_freep(&venc->codebooks);
1080 
1081  if (venc->floors)
1082  for (i = 0; i < venc->nfloors; i++) {
1083  int j;
1084  if (venc->floors[i].classes)
1085  for (j = 0; j < venc->floors[i].nclasses; j++)
1086  av_freep(&venc->floors[i].classes[j].books);
1087  av_freep(&venc->floors[i].classes);
1088  av_freep(&venc->floors[i].partition_to_class);
1089  av_freep(&venc->floors[i].list);
1090  }
1091  av_freep(&venc->floors);
1092 
1093  if (venc->residues)
1094  for (i = 0; i < venc->nresidues; i++) {
1095  av_freep(&venc->residues[i].books);
1096  av_freep(&venc->residues[i].maxes);
1097  }
1098  av_freep(&venc->residues);
1099 
1100  if (venc->mappings)
1101  for (i = 0; i < venc->nmappings; i++) {
1102  av_freep(&venc->mappings[i].mux);
1103  av_freep(&venc->mappings[i].floor);
1104  av_freep(&venc->mappings[i].residue);
1105  av_freep(&venc->mappings[i].magnitude);
1106  av_freep(&venc->mappings[i].angle);
1107  }
1108  av_freep(&venc->mappings);
1109 
1110  av_freep(&venc->modes);
1111 
1112  av_freep(&venc->saved);
1113  av_freep(&venc->samples);
1114  av_freep(&venc->floor);
1115  av_freep(&venc->coeffs);
1116 
1117  ff_mdct_end(&venc->mdct[0]);
1118  ff_mdct_end(&venc->mdct[1]);
1119 
1120  av_freep(&avccontext->coded_frame);
1121  av_freep(&avccontext->extradata);
1122 
1123  return 0 ;
1124 }
1125 
1127 {
1128  vorbis_enc_context *venc = avccontext->priv_data;
1129  int ret;
1130 
1131  if (avccontext->channels != 2) {
1132  av_log(avccontext, AV_LOG_ERROR, "Current Libav Vorbis encoder only supports 2 channels.\n");
1133  return -1;
1134  }
1135 
1136  if ((ret = create_vorbis_context(venc, avccontext)) < 0)
1137  goto error;
1138 
1139  if (avccontext->flags & CODEC_FLAG_QSCALE)
1140  venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
1141  else
1142  venc->quality = 0.03;
1143  venc->quality *= venc->quality;
1144 
1145  if ((ret = put_main_header(venc, (uint8_t**)&avccontext->extradata)) < 0)
1146  goto error;
1147  avccontext->extradata_size = ret;
1148 
1149  avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);
1150 
1151  avccontext->coded_frame = avcodec_alloc_frame();
1152  if (!avccontext->coded_frame) {
1153  ret = AVERROR(ENOMEM);
1154  goto error;
1155  }
1156 
1157  return 0;
1158 error:
1159  vorbis_encode_close(avccontext);
1160  return ret;
1161 }
1162 
1164  .name = "vorbis",
1165  .type = AVMEDIA_TYPE_AUDIO,
1166  .id = CODEC_ID_VORBIS,
1167  .priv_data_size = sizeof(vorbis_enc_context),
1169  .encode = vorbis_encode_frame,
1171  .capabilities= CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
1172  .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
1173  .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1174 };