FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vorbisenc.c
Go to the documentation of this file.
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
23  * Native Vorbis encoder.
24  * @author Oded Shimon <ods15@ods15.dyndns.org>
25  */
26 
27 #include <float.h>
28 
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "fft.h"
32 #include "mathops.h"
33 #include "vorbis.h"
34 #include "vorbis_enc_data.h"
35 
36 #define BITSTREAM_WRITER_LE
37 #include "put_bits.h"
38 
39 #undef NDEBUG
40 #include <assert.h>
41 
42 typedef struct {
43  int nentries;
44  uint8_t *lens;
45  uint32_t *codewords;
46  int ndimensions;
47  float min;
48  float delta;
49  int seq_p;
50  int lookup;
51  int *quantlist;
52  float *dimensions;
53  float *pow2;
54 } vorbis_enc_codebook;
55 
56 typedef struct {
57  int dim;
58  int subclass;
59  int masterbook;
60  int *books;
61 } vorbis_enc_floor_class;
62 
63 typedef struct {
64  int partitions;
65  int *partition_to_class;
66  int nclasses;
67  vorbis_enc_floor_class *classes;
68  int multiplier;
69  int rangebits;
70  int values;
71  vorbis_floor1_entry *list;
72 } vorbis_enc_floor;
73 
74 typedef struct {
75  int type;
76  int begin;
77  int end;
78  int partition_size;
79  int classifications;
80  int classbook;
81  int8_t (*books)[8];
82  float (*maxes)[2];
83 } vorbis_enc_residue;
84 
85 typedef struct {
86  int submaps;
87  int *mux;
88  int *floor;
89  int *residue;
90  int coupling_steps;
91  int *magnitude;
92  int *angle;
93 } vorbis_enc_mapping;
94 
95 typedef struct {
96  int blockflag;
97  int mapping;
98 } vorbis_enc_mode;
99 
100 typedef struct {
101  int channels;
102  int sample_rate;
103  int log2_blocksize[2];
104  FFTContext mdct[2];
105  const float *win[2];
106  int have_saved;
107  float *saved;
108  float *samples;
109  float *floor; // also used for tmp values for mdct
110  float *coeffs; // also used for residue after floor
111  float quality;
112 
113  int ncodebooks;
114  vorbis_enc_codebook *codebooks;
115 
116  int nfloors;
117  vorbis_enc_floor *floors;
118 
119  int nresidues;
120  vorbis_enc_residue *residues;
121 
122  int nmappings;
123  vorbis_enc_mapping *mappings;
124 
125  int nmodes;
126  vorbis_enc_mode *modes;
127 
128  int64_t next_pts;
129 } vorbis_enc_context;
130 
131 #define MAX_CHANNELS 2
132 #define MAX_CODEBOOK_DIM 8
133 
134 #define MAX_FLOOR_CLASS_DIM 4
135 #define NUM_FLOOR_PARTITIONS 8
136 #define MAX_FLOOR_VALUES (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
137 
138 #define RESIDUE_SIZE 1600
139 #define RESIDUE_PART_SIZE 32
140 #define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
141 
142 static inline int put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
143  int entry)
144 {
145  av_assert2(entry >= 0);
146  av_assert2(entry < cb->nentries);
147  av_assert2(cb->lens[entry]);
148  if (pb->size_in_bits - put_bits_count(pb) < cb->lens[entry])
149  return AVERROR(EINVAL);
150  put_bits(pb, cb->lens[entry], cb->codewords[entry]);
151  return 0;
152 }
153 
154 static int cb_lookup_vals(int lookup, int dimensions, int entries)
155 {
156  if (lookup == 1)
157  return ff_vorbis_nth_root(entries, dimensions);
158  else if (lookup == 2)
159  return dimensions *entries;
160  return 0;
161 }
162 
163 static int ready_codebook(vorbis_enc_codebook *cb)
164 {
165  int i;
166 
167  ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
168 
169  if (!cb->lookup) {
170  cb->pow2 = cb->dimensions = NULL;
171  } else {
172  int vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
173  cb->dimensions = av_malloc_array(cb->nentries, sizeof(float) * cb->ndimensions);
174  cb->pow2 = av_mallocz_array(cb->nentries, sizeof(float));
175  if (!cb->dimensions || !cb->pow2)
176  return AVERROR(ENOMEM);
177  for (i = 0; i < cb->nentries; i++) {
178  float last = 0;
179  int j;
180  int div = 1;
181  for (j = 0; j < cb->ndimensions; j++) {
182  int off;
183  if (cb->lookup == 1)
184  off = (i / div) % vals; // lookup type 1
185  else
186  off = i * cb->ndimensions + j; // lookup type 2
187 
188  cb->dimensions[i * cb->ndimensions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
189  if (cb->seq_p)
190  last = cb->dimensions[i * cb->ndimensions + j];
191  cb->pow2[i] += cb->dimensions[i * cb->ndimensions + j] * cb->dimensions[i * cb->ndimensions + j];
192  div *= vals;
193  }
194  cb->pow2[i] /= 2.0;
195  }
196  }
197  return 0;
198 }
199 
200 static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
201 {
202  int i;
203  av_assert0(rc->type == 2);
204  rc->maxes = av_mallocz_array(rc->classifications, sizeof(float[2]));
205  if (!rc->maxes)
206  return AVERROR(ENOMEM);
207  for (i = 0; i < rc->classifications; i++) {
208  int j;
209  vorbis_enc_codebook * cb;
210  for (j = 0; j < 8; j++)
211  if (rc->books[i][j] != -1)
212  break;
213  if (j == 8) // zero
214  continue;
215  cb = &venc->codebooks[rc->books[i][j]];
216  assert(cb->ndimensions >= 2);
217  assert(cb->lookup);
218 
219  for (j = 0; j < cb->nentries; j++) {
220  float a;
221  if (!cb->lens[j])
222  continue;
223  a = fabs(cb->dimensions[j * cb->ndimensions]);
224  if (a > rc->maxes[i][0])
225  rc->maxes[i][0] = a;
226  a = fabs(cb->dimensions[j * cb->ndimensions + 1]);
227  if (a > rc->maxes[i][1])
228  rc->maxes[i][1] = a;
229  }
230  }
231  // small bias
232  for (i = 0; i < rc->classifications; i++) {
233  rc->maxes[i][0] += 0.8;
234  rc->maxes[i][1] += 0.8;
235  }
236  return 0;
237 }
238 
239 static int create_vorbis_context(vorbis_enc_context *venc,
240  AVCodecContext *avctx)
241 {
242  vorbis_enc_floor *fc;
243  vorbis_enc_residue *rc;
244  vorbis_enc_mapping *mc;
245  int i, book, ret;
246 
247  venc->channels = avctx->channels;
248  venc->sample_rate = avctx->sample_rate;
249  venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
250 
251  venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
252  venc->codebooks = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
253  if (!venc->codebooks)
254  return AVERROR(ENOMEM);
255 
256  // codebook 0..14 - floor1 book, values 0..255
257  // codebook 15 residue masterbook
258  // codebook 16..29 residue
259  for (book = 0; book < venc->ncodebooks; book++) {
260  vorbis_enc_codebook *cb = &venc->codebooks[book];
261  int vals;
262  cb->ndimensions = cvectors[book].dim;
263  cb->nentries = cvectors[book].real_len;
264  cb->min = cvectors[book].min;
265  cb->delta = cvectors[book].delta;
266  cb->lookup = cvectors[book].lookup;
267  cb->seq_p = 0;
268 
269  cb->lens = av_malloc_array(cb->nentries, sizeof(uint8_t));
270  cb->codewords = av_malloc_array(cb->nentries, sizeof(uint32_t));
271  if (!cb->lens || !cb->codewords)
272  return AVERROR(ENOMEM);
273  memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
274  memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
275 
276  if (cb->lookup) {
277  vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
278  cb->quantlist = av_malloc_array(vals, sizeof(int));
279  if (!cb->quantlist)
280  return AVERROR(ENOMEM);
281  for (i = 0; i < vals; i++)
282  cb->quantlist[i] = cvectors[book].quant[i];
283  } else {
284  cb->quantlist = NULL;
285  }
286  if ((ret = ready_codebook(cb)) < 0)
287  return ret;
288  }
289 
290  venc->nfloors = 1;
291  venc->floors = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
292  if (!venc->floors)
293  return AVERROR(ENOMEM);
294 
295  // just 1 floor
296  fc = &venc->floors[0];
297  fc->partitions = NUM_FLOOR_PARTITIONS;
298  fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
299  if (!fc->partition_to_class)
300  return AVERROR(ENOMEM);
301  fc->nclasses = 0;
302  for (i = 0; i < fc->partitions; i++) {
303  static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
304  fc->partition_to_class[i] = a[i];
305  fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
306  }
307  fc->nclasses++;
308  fc->classes = av_malloc_array(fc->nclasses, sizeof(vorbis_enc_floor_class));
309  if (!fc->classes)
310  return AVERROR(ENOMEM);
311  for (i = 0; i < fc->nclasses; i++) {
312  vorbis_enc_floor_class * c = &fc->classes[i];
313  int j, books;
314  c->dim = floor_classes[i].dim;
315  c->subclass = floor_classes[i].subclass;
316  c->masterbook = floor_classes[i].masterbook;
317  books = (1 << c->subclass);
318  c->books = av_malloc_array(books, sizeof(int));
319  if (!c->books)
320  return AVERROR(ENOMEM);
321  for (j = 0; j < books; j++)
322  c->books[j] = floor_classes[i].nbooks[j];
323  }
324  fc->multiplier = 2;
325  fc->rangebits = venc->log2_blocksize[0] - 1;
326 
327  fc->values = 2;
328  for (i = 0; i < fc->partitions; i++)
329  fc->values += fc->classes[fc->partition_to_class[i]].dim;
330 
331  fc->list = av_malloc_array(fc->values, sizeof(vorbis_floor1_entry));
332  if (!fc->list)
333  return AVERROR(ENOMEM);
334  fc->list[0].x = 0;
335  fc->list[1].x = 1 << fc->rangebits;
336  for (i = 2; i < fc->values; i++) {
337  static const int a[] = {
338  93, 23,372, 6, 46,186,750, 14, 33, 65,
339  130,260,556, 3, 10, 18, 28, 39, 55, 79,
340  111,158,220,312,464,650,850
341  };
342  fc->list[i].x = a[i - 2];
343  }
344  if (ff_vorbis_ready_floor1_list(avctx, fc->list, fc->values))
345  return AVERROR_BUG;
346 
347  venc->nresidues = 1;
348  venc->residues = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
349  if (!venc->residues)
350  return AVERROR(ENOMEM);
351 
352  // single residue
353  rc = &venc->residues[0];
354  rc->type = 2;
355  rc->begin = 0;
356  rc->end = 1600;
357  rc->partition_size = 32;
358  rc->classifications = 10;
359  rc->classbook = 15;
360  rc->books = av_malloc(sizeof(*rc->books) * rc->classifications);
361  if (!rc->books)
362  return AVERROR(ENOMEM);
363  {
364  static const int8_t a[10][8] = {
365  { -1, -1, -1, -1, -1, -1, -1, -1, },
366  { -1, -1, 16, -1, -1, -1, -1, -1, },
367  { -1, -1, 17, -1, -1, -1, -1, -1, },
368  { -1, -1, 18, -1, -1, -1, -1, -1, },
369  { -1, -1, 19, -1, -1, -1, -1, -1, },
370  { -1, -1, 20, -1, -1, -1, -1, -1, },
371  { -1, -1, 21, -1, -1, -1, -1, -1, },
372  { 22, 23, -1, -1, -1, -1, -1, -1, },
373  { 24, 25, -1, -1, -1, -1, -1, -1, },
374  { 26, 27, 28, -1, -1, -1, -1, -1, },
375  };
376  memcpy(rc->books, a, sizeof a);
377  }
378  if ((ret = ready_residue(rc, venc)) < 0)
379  return ret;
380 
381  venc->nmappings = 1;
382  venc->mappings = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
383  if (!venc->mappings)
384  return AVERROR(ENOMEM);
385 
386  // single mapping
387  mc = &venc->mappings[0];
388  mc->submaps = 1;
389  mc->mux = av_malloc(sizeof(int) * venc->channels);
390  if (!mc->mux)
391  return AVERROR(ENOMEM);
392  for (i = 0; i < venc->channels; i++)
393  mc->mux[i] = 0;
394  mc->floor = av_malloc(sizeof(int) * mc->submaps);
395  mc->residue = av_malloc(sizeof(int) * mc->submaps);
396  if (!mc->floor || !mc->residue)
397  return AVERROR(ENOMEM);
398  for (i = 0; i < mc->submaps; i++) {
399  mc->floor[i] = 0;
400  mc->residue[i] = 0;
401  }
402  mc->coupling_steps = venc->channels == 2 ? 1 : 0;
403  mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps);
404  mc->angle = av_malloc(sizeof(int) * mc->coupling_steps);
405  if (!mc->magnitude || !mc->angle)
406  return AVERROR(ENOMEM);
407  if (mc->coupling_steps) {
408  mc->magnitude[0] = 0;
409  mc->angle[0] = 1;
410  }
411 
412  venc->nmodes = 1;
413  venc->modes = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
414  if (!venc->modes)
415  return AVERROR(ENOMEM);
416 
417  // single mode
418  venc->modes[0].blockflag = 0;
419  venc->modes[0].mapping = 0;
420 
421  venc->have_saved = 0;
422  venc->saved = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]) / 2);
423  venc->samples = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]));
424  venc->floor = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]) / 2);
425  venc->coeffs = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]) / 2);
426  if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs)
427  return AVERROR(ENOMEM);
428 
429  venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
430  venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
431 
432  if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)
433  return ret;
434  if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)
435  return ret;
436 
437  return 0;
438 }
439 
440 static void put_float(PutBitContext *pb, float f)
441 {
442  int exp, mant;
443  uint32_t res = 0;
444  mant = (int)ldexp(frexp(f, &exp), 20);
445  exp += 788 - 20;
446  if (mant < 0) {
447  res |= (1U << 31);
448  mant = -mant;
449  }
450  res |= mant | (exp << 21);
451  put_bits32(pb, res);
452 }
453 
454 static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
455 {
456  int i;
457  int ordered = 0;
458 
459  put_bits(pb, 24, 0x564342); //magic
460  put_bits(pb, 16, cb->ndimensions);
461  put_bits(pb, 24, cb->nentries);
462 
463  for (i = 1; i < cb->nentries; i++)
464  if (cb->lens[i] < cb->lens[i-1])
465  break;
466  if (i == cb->nentries)
467  ordered = 1;
468 
469  put_bits(pb, 1, ordered);
470  if (ordered) {
471  int len = cb->lens[0];
472  put_bits(pb, 5, len - 1);
473  i = 0;
474  while (i < cb->nentries) {
475  int j;
476  for (j = 0; j+i < cb->nentries; j++)
477  if (cb->lens[j+i] != len)
478  break;
479  put_bits(pb, ilog(cb->nentries - i), j);
480  i += j;
481  len++;
482  }
483  } else {
484  int sparse = 0;
485  for (i = 0; i < cb->nentries; i++)
486  if (!cb->lens[i])
487  break;
488  if (i != cb->nentries)
489  sparse = 1;
490  put_bits(pb, 1, sparse);
491 
492  for (i = 0; i < cb->nentries; i++) {
493  if (sparse)
494  put_bits(pb, 1, !!cb->lens[i]);
495  if (cb->lens[i])
496  put_bits(pb, 5, cb->lens[i] - 1);
497  }
498  }
499 
500  put_bits(pb, 4, cb->lookup);
501  if (cb->lookup) {
502  int tmp = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
503  int bits = ilog(cb->quantlist[0]);
504 
505  for (i = 1; i < tmp; i++)
506  bits = FFMAX(bits, ilog(cb->quantlist[i]));
507 
508  put_float(pb, cb->min);
509  put_float(pb, cb->delta);
510 
511  put_bits(pb, 4, bits - 1);
512  put_bits(pb, 1, cb->seq_p);
513 
514  for (i = 0; i < tmp; i++)
515  put_bits(pb, bits, cb->quantlist[i]);
516  }
517 }
518 
519 static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
520 {
521  int i;
522 
523  put_bits(pb, 16, 1); // type, only floor1 is supported
524 
525  put_bits(pb, 5, fc->partitions);
526 
527  for (i = 0; i < fc->partitions; i++)
528  put_bits(pb, 4, fc->partition_to_class[i]);
529 
530  for (i = 0; i < fc->nclasses; i++) {
531  int j, books;
532 
533  put_bits(pb, 3, fc->classes[i].dim - 1);
534  put_bits(pb, 2, fc->classes[i].subclass);
535 
536  if (fc->classes[i].subclass)
537  put_bits(pb, 8, fc->classes[i].masterbook);
538 
539  books = (1 << fc->classes[i].subclass);
540 
541  for (j = 0; j < books; j++)
542  put_bits(pb, 8, fc->classes[i].books[j] + 1);
543  }
544 
545  put_bits(pb, 2, fc->multiplier - 1);
546  put_bits(pb, 4, fc->rangebits);
547 
548  for (i = 2; i < fc->values; i++)
549  put_bits(pb, fc->rangebits, fc->list[i].x);
550 }
551 
552 static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
553 {
554  int i;
555 
556  put_bits(pb, 16, rc->type);
557 
558  put_bits(pb, 24, rc->begin);
559  put_bits(pb, 24, rc->end);
560  put_bits(pb, 24, rc->partition_size - 1);
561  put_bits(pb, 6, rc->classifications - 1);
562  put_bits(pb, 8, rc->classbook);
563 
564  for (i = 0; i < rc->classifications; i++) {
565  int j, tmp = 0;
566  for (j = 0; j < 8; j++)
567  tmp |= (rc->books[i][j] != -1) << j;
568 
569  put_bits(pb, 3, tmp & 7);
570  put_bits(pb, 1, tmp > 7);
571 
572  if (tmp > 7)
573  put_bits(pb, 5, tmp >> 3);
574  }
575 
576  for (i = 0; i < rc->classifications; i++) {
577  int j;
578  for (j = 0; j < 8; j++)
579  if (rc->books[i][j] != -1)
580  put_bits(pb, 8, rc->books[i][j]);
581  }
582 }
583 
584 static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
585 {
586  int i;
587  PutBitContext pb;
588  int len, hlens[3];
589  int buffer_len = 50000;
590  uint8_t *buffer = av_mallocz(buffer_len), *p = buffer;
591  if (!buffer)
592  return AVERROR(ENOMEM);
593 
594  // identification header
595  init_put_bits(&pb, p, buffer_len);
596  put_bits(&pb, 8, 1); //magic
597  for (i = 0; "vorbis"[i]; i++)
598  put_bits(&pb, 8, "vorbis"[i]);
599  put_bits32(&pb, 0); // version
600  put_bits(&pb, 8, venc->channels);
601  put_bits32(&pb, venc->sample_rate);
602  put_bits32(&pb, 0); // bitrate
603  put_bits32(&pb, 0); // bitrate
604  put_bits32(&pb, 0); // bitrate
605  put_bits(&pb, 4, venc->log2_blocksize[0]);
606  put_bits(&pb, 4, venc->log2_blocksize[1]);
607  put_bits(&pb, 1, 1); // framing
608 
609  flush_put_bits(&pb);
610  hlens[0] = put_bits_count(&pb) >> 3;
611  buffer_len -= hlens[0];
612  p += hlens[0];
613 
614  // comment header
615  init_put_bits(&pb, p, buffer_len);
616  put_bits(&pb, 8, 3); //magic
617  for (i = 0; "vorbis"[i]; i++)
618  put_bits(&pb, 8, "vorbis"[i]);
619  put_bits32(&pb, 0); // vendor length TODO
620  put_bits32(&pb, 0); // amount of comments
621  put_bits(&pb, 1, 1); // framing
622 
623  flush_put_bits(&pb);
624  hlens[1] = put_bits_count(&pb) >> 3;
625  buffer_len -= hlens[1];
626  p += hlens[1];
627 
628  // setup header
629  init_put_bits(&pb, p, buffer_len);
630  put_bits(&pb, 8, 5); //magic
631  for (i = 0; "vorbis"[i]; i++)
632  put_bits(&pb, 8, "vorbis"[i]);
633 
634  // codebooks
635  put_bits(&pb, 8, venc->ncodebooks - 1);
636  for (i = 0; i < venc->ncodebooks; i++)
637  put_codebook_header(&pb, &venc->codebooks[i]);
638 
639  // time domain, reserved, zero
640  put_bits(&pb, 6, 0);
641  put_bits(&pb, 16, 0);
642 
643  // floors
644  put_bits(&pb, 6, venc->nfloors - 1);
645  for (i = 0; i < venc->nfloors; i++)
646  put_floor_header(&pb, &venc->floors[i]);
647 
648  // residues
649  put_bits(&pb, 6, venc->nresidues - 1);
650  for (i = 0; i < venc->nresidues; i++)
651  put_residue_header(&pb, &venc->residues[i]);
652 
653  // mappings
654  put_bits(&pb, 6, venc->nmappings - 1);
655  for (i = 0; i < venc->nmappings; i++) {
656  vorbis_enc_mapping *mc = &venc->mappings[i];
657  int j;
658  put_bits(&pb, 16, 0); // mapping type
659 
660  put_bits(&pb, 1, mc->submaps > 1);
661  if (mc->submaps > 1)
662  put_bits(&pb, 4, mc->submaps - 1);
663 
664  put_bits(&pb, 1, !!mc->coupling_steps);
665  if (mc->coupling_steps) {
666  put_bits(&pb, 8, mc->coupling_steps - 1);
667  for (j = 0; j < mc->coupling_steps; j++) {
668  put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
669  put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
670  }
671  }
672 
673  put_bits(&pb, 2, 0); // reserved
674 
675  if (mc->submaps > 1)
676  for (j = 0; j < venc->channels; j++)
677  put_bits(&pb, 4, mc->mux[j]);
678 
679  for (j = 0; j < mc->submaps; j++) {
680  put_bits(&pb, 8, 0); // reserved time configuration
681  put_bits(&pb, 8, mc->floor[j]);
682  put_bits(&pb, 8, mc->residue[j]);
683  }
684  }
685 
686  // modes
687  put_bits(&pb, 6, venc->nmodes - 1);
688  for (i = 0; i < venc->nmodes; i++) {
689  put_bits(&pb, 1, venc->modes[i].blockflag);
690  put_bits(&pb, 16, 0); // reserved window type
691  put_bits(&pb, 16, 0); // reserved transform type
692  put_bits(&pb, 8, venc->modes[i].mapping);
693  }
694 
695  put_bits(&pb, 1, 1); // framing
696 
697  flush_put_bits(&pb);
698  hlens[2] = put_bits_count(&pb) >> 3;
699 
700  len = hlens[0] + hlens[1] + hlens[2];
701  p = *out = av_mallocz(64 + len + len/255);
702  if (!p)
703  return AVERROR(ENOMEM);
704 
705  *p++ = 2;
706  p += av_xiphlacing(p, hlens[0]);
707  p += av_xiphlacing(p, hlens[1]);
708  buffer_len = 0;
709  for (i = 0; i < 3; i++) {
710  memcpy(p, buffer + buffer_len, hlens[i]);
711  p += hlens[i];
712  buffer_len += hlens[i];
713  }
714 
715  av_freep(&buffer);
716  return p - *out;
717 }
718 
719 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
720 {
721  int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
722  int end = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
723  int j;
724  float average = 0;
725 
726  for (j = begin; j < end; j++)
727  average += fabs(coeffs[j]);
728  return average / (end - begin);
729 }
730 
731 static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
732  float *coeffs, uint16_t *posts, int samples)
733 {
734  int range = 255 / fc->multiplier + 1;
735  int i;
736  float tot_average = 0.0;
737  float averages[MAX_FLOOR_VALUES];
738  for (i = 0; i < fc->values; i++) {
739  averages[i] = get_floor_average(fc, coeffs, i);
740  tot_average += averages[i];
741  }
742  tot_average /= fc->values;
743  tot_average /= venc->quality;
744 
745  for (i = 0; i < fc->values; i++) {
746  int position = fc->list[fc->list[i].sort].x;
747  float average = averages[i];
748  int j;
749 
750  average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
751  for (j = 0; j < range - 1; j++)
752  if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
753  break;
754  posts[fc->list[i].sort] = j;
755  }
756 }
757 
758 static int render_point(int x0, int y0, int x1, int y1, int x)
759 {
760  return y0 + (x - x0) * (y1 - y0) / (x1 - x0);
761 }
762 
763 static int floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
764  PutBitContext *pb, uint16_t *posts,
765  float *floor, int samples)
766 {
767  int range = 255 / fc->multiplier + 1;
768  int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
769  int i, counter;
770 
771  if (pb->size_in_bits - put_bits_count(pb) < 1 + 2 * ilog(range - 1))
772  return AVERROR(EINVAL);
773  put_bits(pb, 1, 1); // non zero
774  put_bits(pb, ilog(range - 1), posts[0]);
775  put_bits(pb, ilog(range - 1), posts[1]);
776  coded[0] = coded[1] = 1;
777 
778  for (i = 2; i < fc->values; i++) {
779  int predicted = render_point(fc->list[fc->list[i].low].x,
780  posts[fc->list[i].low],
781  fc->list[fc->list[i].high].x,
782  posts[fc->list[i].high],
783  fc->list[i].x);
784  int highroom = range - predicted;
785  int lowroom = predicted;
786  int room = FFMIN(highroom, lowroom);
787  if (predicted == posts[i]) {
788  coded[i] = 0; // must be used later as flag!
789  continue;
790  } else {
791  if (!coded[fc->list[i].low ])
792  coded[fc->list[i].low ] = -1;
793  if (!coded[fc->list[i].high])
794  coded[fc->list[i].high] = -1;
795  }
796  if (posts[i] > predicted) {
797  if (posts[i] - predicted > room)
798  coded[i] = posts[i] - predicted + lowroom;
799  else
800  coded[i] = (posts[i] - predicted) << 1;
801  } else {
802  if (predicted - posts[i] > room)
803  coded[i] = predicted - posts[i] + highroom - 1;
804  else
805  coded[i] = ((predicted - posts[i]) << 1) - 1;
806  }
807  }
808 
809  counter = 2;
810  for (i = 0; i < fc->partitions; i++) {
811  vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
812  int k, cval = 0, csub = 1<<c->subclass;
813  if (c->subclass) {
814  vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
815  int cshift = 0;
816  for (k = 0; k < c->dim; k++) {
817  int l;
818  for (l = 0; l < csub; l++) {
819  int maxval = 1;
820  if (c->books[l] != -1)
821  maxval = venc->codebooks[c->books[l]].nentries;
822  // coded could be -1, but this still works, cause that is 0
823  if (coded[counter + k] < maxval)
824  break;
825  }
826  assert(l != csub);
827  cval |= l << cshift;
828  cshift += c->subclass;
829  }
830  if (put_codeword(pb, book, cval))
831  return AVERROR(EINVAL);
832  }
833  for (k = 0; k < c->dim; k++) {
834  int book = c->books[cval & (csub-1)];
835  int entry = coded[counter++];
836  cval >>= c->subclass;
837  if (book == -1)
838  continue;
839  if (entry == -1)
840  entry = 0;
841  if (put_codeword(pb, &venc->codebooks[book], entry))
842  return AVERROR(EINVAL);
843  }
844  }
845 
846  ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
847  fc->multiplier, floor, samples);
848 
849  return 0;
850 }
851 
852 static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
853  float *num)
854 {
855  int i, entry = -1;
856  float distance = FLT_MAX;
857  assert(book->dimensions);
858  for (i = 0; i < book->nentries; i++) {
859  float * vec = book->dimensions + i * book->ndimensions, d = book->pow2[i];
860  int j;
861  if (!book->lens[i])
862  continue;
863  for (j = 0; j < book->ndimensions; j++)
864  d -= vec[j] * num[j];
865  if (distance > d) {
866  entry = i;
867  distance = d;
868  }
869  }
870  if (put_codeword(pb, book, entry))
871  return NULL;
872  return &book->dimensions[entry * book->ndimensions];
873 }
874 
875 static int residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
876  PutBitContext *pb, float *coeffs, int samples,
877  int real_ch)
878 {
879  int pass, i, j, p, k;
880  int psize = rc->partition_size;
881  int partitions = (rc->end - rc->begin) / psize;
882  int channels = (rc->type == 2) ? 1 : real_ch;
883  int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
884  int classwords = venc->codebooks[rc->classbook].ndimensions;
885 
886  av_assert0(rc->type == 2);
887  av_assert0(real_ch == 2);
888  for (p = 0; p < partitions; p++) {
889  float max1 = 0.0, max2 = 0.0;
890  int s = rc->begin + p * psize;
891  for (k = s; k < s + psize; k += 2) {
892  max1 = FFMAX(max1, fabs(coeffs[ k / real_ch]));
893  max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
894  }
895 
896  for (i = 0; i < rc->classifications - 1; i++)
897  if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
898  break;
899  classes[0][p] = i;
900  }
901 
902  for (pass = 0; pass < 8; pass++) {
903  p = 0;
904  while (p < partitions) {
905  if (pass == 0)
906  for (j = 0; j < channels; j++) {
907  vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
908  int entry = 0;
909  for (i = 0; i < classwords; i++) {
910  entry *= rc->classifications;
911  entry += classes[j][p + i];
912  }
913  if (put_codeword(pb, book, entry))
914  return AVERROR(EINVAL);
915  }
916  for (i = 0; i < classwords && p < partitions; i++, p++) {
917  for (j = 0; j < channels; j++) {
918  int nbook = rc->books[classes[j][p]][pass];
919  vorbis_enc_codebook * book = &venc->codebooks[nbook];
920  float *buf = coeffs + samples*j + rc->begin + p*psize;
921  if (nbook == -1)
922  continue;
923 
924  assert(rc->type == 0 || rc->type == 2);
925  assert(!(psize % book->ndimensions));
926 
927  if (rc->type == 0) {
928  for (k = 0; k < psize; k += book->ndimensions) {
929  int l;
930  float *a = put_vector(book, pb, &buf[k]);
931  if (!a)
932  return AVERROR(EINVAL);
933  for (l = 0; l < book->ndimensions; l++)
934  buf[k + l] -= a[l];
935  }
936  } else {
937  int s = rc->begin + p * psize, a1, b1;
938  a1 = (s % real_ch) * samples;
939  b1 = s / real_ch;
940  s = real_ch * samples;
941  for (k = 0; k < psize; k += book->ndimensions) {
942  int dim, a2 = a1, b2 = b1;
943  float vec[MAX_CODEBOOK_DIM], *pv = vec;
944  for (dim = book->ndimensions; dim--; ) {
945  *pv++ = coeffs[a2 + b2];
946  if ((a2 += samples) == s) {
947  a2 = 0;
948  b2++;
949  }
950  }
951  pv = put_vector(book, pb, vec);
952  if (!pv)
953  return AVERROR(EINVAL);
954  for (dim = book->ndimensions; dim--; ) {
955  coeffs[a1 + b1] -= *pv++;
956  if ((a1 += samples) == s) {
957  a1 = 0;
958  b1++;
959  }
960  }
961  }
962  }
963  }
964  }
965  }
966  }
967  return 0;
968 }
969 
970 static int apply_window_and_mdct(vorbis_enc_context *venc,
971  float **audio, int samples)
972 {
973  int i, channel;
974  const float * win = venc->win[0];
975  int window_len = 1 << (venc->log2_blocksize[0] - 1);
976  float n = (float)(1 << venc->log2_blocksize[0]) / 4.0;
977  // FIXME use dsp
978 
979  if (!venc->have_saved && !samples)
980  return 0;
981 
982  if (venc->have_saved) {
983  for (channel = 0; channel < venc->channels; channel++)
984  memcpy(venc->samples + channel * window_len * 2,
985  venc->saved + channel * window_len, sizeof(float) * window_len);
986  } else {
987  for (channel = 0; channel < venc->channels; channel++)
988  memset(venc->samples + channel * window_len * 2, 0,
989  sizeof(float) * window_len);
990  }
991 
992  if (samples) {
993  for (channel = 0; channel < venc->channels; channel++) {
994  float * offset = venc->samples + channel*window_len*2 + window_len;
995  for (i = 0; i < samples; i++)
996  offset[i] = audio[channel][i] / n * win[window_len - i - 1];
997  }
998  } else {
999  for (channel = 0; channel < venc->channels; channel++)
1000  memset(venc->samples + channel * window_len * 2 + window_len,
1001  0, sizeof(float) * window_len);
1002  }
1003 
1004  for (channel = 0; channel < venc->channels; channel++)
1005  venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
1006  venc->samples + channel * window_len * 2);
1007 
1008  if (samples) {
1009  for (channel = 0; channel < venc->channels; channel++) {
1010  float *offset = venc->saved + channel * window_len;
1011  for (i = 0; i < samples; i++)
1012  offset[i] = audio[channel][i] / n * win[i];
1013  }
1014  venc->have_saved = 1;
1015  } else {
1016  venc->have_saved = 0;
1017  }
1018  return 1;
1019 }
1020 
1021 static int vorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1022  const AVFrame *frame, int *got_packet_ptr)
1023 {
1024  vorbis_enc_context *venc = avctx->priv_data;
1025  float **audio = frame ? (float **)frame->extended_data : NULL;
1026  int samples = frame ? frame->nb_samples : 0;
1027  vorbis_enc_mode *mode;
1028  vorbis_enc_mapping *mapping;
1029  PutBitContext pb;
1030  int i, ret;
1031 
1032  if (!apply_window_and_mdct(venc, audio, samples))
1033  return 0;
1034  samples = 1 << (venc->log2_blocksize[0] - 1);
1035 
1036  if ((ret = ff_alloc_packet2(avctx, avpkt, 8192)) < 0)
1037  return ret;
1038 
1039  init_put_bits(&pb, avpkt->data, avpkt->size);
1040 
1041  if (pb.size_in_bits - put_bits_count(&pb) < 1 + ilog(venc->nmodes - 1)) {
1042  av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1043  return AVERROR(EINVAL);
1044  }
1045 
1046  put_bits(&pb, 1, 0); // magic bit
1047 
1048  put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
1049 
1050  mode = &venc->modes[0];
1051  mapping = &venc->mappings[mode->mapping];
1052  if (mode->blockflag) {
1053  put_bits(&pb, 1, 0);
1054  put_bits(&pb, 1, 0);
1055  }
1056 
1057  for (i = 0; i < venc->channels; i++) {
1058  vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
1059  uint16_t posts[MAX_FLOOR_VALUES];
1060  floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
1061  if (floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples)) {
1062  av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1063  return AVERROR(EINVAL);
1064  }
1065  }
1066 
1067  for (i = 0; i < venc->channels * samples; i++)
1068  venc->coeffs[i] /= venc->floor[i];
1069 
1070  for (i = 0; i < mapping->coupling_steps; i++) {
1071  float *mag = venc->coeffs + mapping->magnitude[i] * samples;
1072  float *ang = venc->coeffs + mapping->angle[i] * samples;
1073  int j;
1074  for (j = 0; j < samples; j++) {
1075  float a = ang[j];
1076  ang[j] -= mag[j];
1077  if (mag[j] > 0)
1078  ang[j] = -ang[j];
1079  if (ang[j] < 0)
1080  mag[j] = a;
1081  }
1082  }
1083 
1084  if (residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
1085  &pb, venc->coeffs, samples, venc->channels)) {
1086  av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1087  return AVERROR(EINVAL);
1088  }
1089 
1090  flush_put_bits(&pb);
1091  avpkt->size = put_bits_count(&pb) >> 3;
1092 
1093  avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size);
1094  if (frame) {
1095  if (frame->pts != AV_NOPTS_VALUE)
1096  avpkt->pts = ff_samples_to_time_base(avctx, frame->pts);
1097  } else {
1098  avpkt->pts = venc->next_pts;
1099  }
1100  if (avpkt->pts != AV_NOPTS_VALUE)
1101  venc->next_pts = avpkt->pts + avpkt->duration;
1102 
1103  *got_packet_ptr = 1;
1104  return 0;
1105 }
1106 
1107 
1108 static av_cold int vorbis_encode_close(AVCodecContext *avctx)
1109 {
1110  vorbis_enc_context *venc = avctx->priv_data;
1111  int i;
1112 
1113  if (venc->codebooks)
1114  for (i = 0; i < venc->ncodebooks; i++) {
1115  av_freep(&venc->codebooks[i].lens);
1116  av_freep(&venc->codebooks[i].codewords);
1117  av_freep(&venc->codebooks[i].quantlist);
1118  av_freep(&venc->codebooks[i].dimensions);
1119  av_freep(&venc->codebooks[i].pow2);
1120  }
1121  av_freep(&venc->codebooks);
1122 
1123  if (venc->floors)
1124  for (i = 0; i < venc->nfloors; i++) {
1125  int j;
1126  if (venc->floors[i].classes)
1127  for (j = 0; j < venc->floors[i].nclasses; j++)
1128  av_freep(&venc->floors[i].classes[j].books);
1129  av_freep(&venc->floors[i].classes);
1130  av_freep(&venc->floors[i].partition_to_class);
1131  av_freep(&venc->floors[i].list);
1132  }
1133  av_freep(&venc->floors);
1134 
1135  if (venc->residues)
1136  for (i = 0; i < venc->nresidues; i++) {
1137  av_freep(&venc->residues[i].books);
1138  av_freep(&venc->residues[i].maxes);
1139  }
1140  av_freep(&venc->residues);
1141 
1142  if (venc->mappings)
1143  for (i = 0; i < venc->nmappings; i++) {
1144  av_freep(&venc->mappings[i].mux);
1145  av_freep(&venc->mappings[i].floor);
1146  av_freep(&venc->mappings[i].residue);
1147  av_freep(&venc->mappings[i].magnitude);
1148  av_freep(&venc->mappings[i].angle);
1149  }
1150  av_freep(&venc->mappings);
1151 
1152  av_freep(&venc->modes);
1153 
1154  av_freep(&venc->saved);
1155  av_freep(&venc->samples);
1156  av_freep(&venc->floor);
1157  av_freep(&venc->coeffs);
1158 
1159  ff_mdct_end(&venc->mdct[0]);
1160  ff_mdct_end(&venc->mdct[1]);
1161 
1162  av_freep(&avctx->extradata);
1163 
1164  return 0 ;
1165 }
1166 
1167 static av_cold int vorbis_encode_init(AVCodecContext *avctx)
1168 {
1169  vorbis_enc_context *venc = avctx->priv_data;
1170  int ret;
1171 
1172  if (avctx->channels != 2) {
1173  av_log(avctx, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
1174  return -1;
1175  }
1176 
1177  if ((ret = create_vorbis_context(venc, avctx)) < 0)
1178  goto error;
1179 
1180  avctx->bit_rate = 0;
1181  if (avctx->flags & CODEC_FLAG_QSCALE)
1182  venc->quality = avctx->global_quality / (float)FF_QP2LAMBDA;
1183  else
1184  venc->quality = 8;
1185  venc->quality *= venc->quality;
1186 
1187  if ((ret = put_main_header(venc, (uint8_t**)&avctx->extradata)) < 0)
1188  goto error;
1189  avctx->extradata_size = ret;
1190 
1191  avctx->frame_size = 1 << (venc->log2_blocksize[0] - 1);
1192 
1193  return 0;
1194 error:
1195  vorbis_encode_close(avctx);
1196  return ret;
1197 }
1198 
1199 AVCodec ff_vorbis_encoder = {
1200  .name = "vorbis",
1201  .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1202  .type = AVMEDIA_TYPE_AUDIO,
1203  .id = AV_CODEC_ID_VORBIS,
1204  .priv_data_size = sizeof(vorbis_enc_context),
1205  .init = vorbis_encode_init,
1206  .encode2 = vorbis_encode_frame,
1207  .close = vorbis_encode_close,
1208  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
1209  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
1210  AV_SAMPLE_FMT_NONE },
1211 };
Generated on Fri Dec 5 2014 04:42:04 for FFmpeg by   doxygen 1.8.2