2 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
4 * This file is part of FFmpeg.
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.
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.
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
23 * Native Vorbis encoder.
24 * @author Oded Shimon <ods15@ods15.dyndns.org>
31 #include "vorbis_enc_data.h"
59 int * partition_to_class;
61 floor_class_t * classes;
65 floor1_entry_t * list;
97 int log2_blocksize[2];
103 float * floor; // also used for tmp values for mdct
104 float * coeffs; // also used for residue after floor
108 codebook_t * codebooks;
114 residue_t * residues;
117 mapping_t * mappings;
120 vorbis_mode_t * modes;
122 int64_t sample_count;
132 static inline void init_put_bits(PutBitContext * pb, uint8_t * buf, int buffer_len) {
133 pb->total = buffer_len * 8;
139 static void put_bits(PutBitContext * pb, int bits, uint64_t val) {
140 if ((pb->total_pos += bits) >= pb->total) return;
143 if (pb->pos > bits) {
144 *pb->buf_ptr |= val << (8 - pb->pos);
148 *pb->buf_ptr++ |= (val << (8 - pb->pos)) & 0xFF;
154 for (; bits >= 8; bits -= 8) {
155 *pb->buf_ptr++ = val & 0xFF;
164 static inline void flush_put_bits(PutBitContext * pb) {
167 static inline int put_bits_count(PutBitContext * pb) {
168 return pb->total_pos;
171 static inline void put_codeword(PutBitContext * pb, codebook_t * cb, int entry) {
173 assert(entry < cb->nentries);
174 assert(cb->lens[entry]);
175 put_bits(pb, cb->lens[entry], cb->codewords[entry]);
178 static int cb_lookup_vals(int lookup, int dimentions, int entries) {
179 if (lookup == 1) return ff_vorbis_nth_root(entries, dimentions);
180 else if (lookup == 2) return dimentions * entries;
184 static void ready_codebook(codebook_t * cb) {
187 ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
190 cb->pow2 = cb->dimentions = NULL;
192 int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
193 cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
194 cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
195 for (i = 0; i < cb->nentries; i++) {
199 for (j = 0; j < cb->ndimentions; j++) {
202 off = (i / div) % vals; // lookup type 1
204 off = i * cb->ndimentions + j; // lookup type 2
206 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
208 last = cb->dimentions[i * cb->ndimentions + j];
209 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j]*cb->dimentions[i * cb->ndimentions + j];
217 static void ready_residue(residue_t * rc, venc_context_t * venc) {
219 assert(rc->type == 2);
220 rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
221 for (i = 0; i < rc->classifications; i++) {
224 for (j = 0; j < 8; j++)
225 if (rc->books[i][j] != -1) break;
226 if (j == 8) continue; // zero
227 cb = &venc->codebooks[rc->books[i][j]];
228 assert(cb->ndimentions >= 2);
231 for (j = 0; j < cb->nentries; j++) {
233 if (!cb->lens[j]) continue;
234 a = fabs(cb->dimentions[j * cb->ndimentions]);
235 if (a > rc->maxes[i][0])
237 a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
238 if (a > rc->maxes[i][1])
243 for (i = 0; i < rc->classifications; i++) {
244 rc->maxes[i][0] += 0.8;
245 rc->maxes[i][1] += 0.8;
249 static void create_vorbis_context(venc_context_t * venc, AVCodecContext * avccontext) {
255 venc->channels = avccontext->channels;
256 venc->sample_rate = avccontext->sample_rate;
257 venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
259 venc->ncodebooks = sizeof(cvectors)/sizeof(cvectors[0]);
260 venc->codebooks = av_malloc(sizeof(codebook_t) * venc->ncodebooks);
262 // codebook 0..14 - floor1 book, values 0..255
263 // codebook 15 residue masterbook
264 // codebook 16..29 residue
265 for (book = 0; book < venc->ncodebooks; book++) {
266 codebook_t * cb = &venc->codebooks[book];
268 cb->ndimentions = cvectors[book].dim;
269 cb->nentries = cvectors[book].real_len;
270 cb->min = cvectors[book].min;
271 cb->delta = cvectors[book].delta;
272 cb->lookup = cvectors[book].lookup;
275 cb->lens = av_malloc(sizeof(uint8_t) * cb->nentries);
276 cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
277 memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
278 memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
281 vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
282 cb->quantlist = av_malloc(sizeof(int) * vals);
283 for (i = 0; i < vals; i++)
284 cb->quantlist[i] = cvectors[book].quant[i];
286 cb->quantlist = NULL;
292 venc->floors = av_malloc(sizeof(floor_t) * venc->nfloors);
295 fc = &venc->floors[0];
297 fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
299 for (i = 0; i < fc->partitions; i++) {
300 static const int a[] = {0,1,2,2,3,3,4,4};
301 fc->partition_to_class[i] = a[i];
302 fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
305 fc->classes = av_malloc(sizeof(floor_class_t) * fc->nclasses);
306 for (i = 0; i < fc->nclasses; i++) {
307 floor_class_t * c = &fc->classes[i];
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 for (j = 0; j < books; j++)
315 c->books[j] = floor_classes[i].nbooks[j];
318 fc->rangebits = venc->log2_blocksize[0] - 1;
321 for (i = 0; i < fc->partitions; i++)
322 fc->values += fc->classes[fc->partition_to_class[i]].dim;
324 fc->list = av_malloc(sizeof(floor1_entry_t) * fc->values);
326 fc->list[1].x = 1 << fc->rangebits;
327 for (i = 2; i < fc->values; i++) {
328 static const int a[] = {
329 93, 23,372, 6, 46,186,750, 14, 33, 65,
330 130,260,556, 3, 10, 18, 28, 39, 55, 79,
331 111,158,220,312,464,650,850
333 fc->list[i].x = a[i - 2];
335 ff_vorbis_ready_floor1_list(fc->list, fc->values);
338 venc->residues = av_malloc(sizeof(residue_t) * venc->nresidues);
341 rc = &venc->residues[0];
345 rc->partition_size = 32;
346 rc->classifications = 10;
348 rc->books = av_malloc(sizeof(*rc->books) * rc->classifications);
350 static const int8_t a[10][8] = {
351 { -1, -1, -1, -1, -1, -1, -1, -1, },
352 { -1, -1, 16, -1, -1, -1, -1, -1, },
353 { -1, -1, 17, -1, -1, -1, -1, -1, },
354 { -1, -1, 18, -1, -1, -1, -1, -1, },
355 { -1, -1, 19, -1, -1, -1, -1, -1, },
356 { -1, -1, 20, -1, -1, -1, -1, -1, },
357 { -1, -1, 21, -1, -1, -1, -1, -1, },
358 { 22, 23, -1, -1, -1, -1, -1, -1, },
359 { 24, 25, -1, -1, -1, -1, -1, -1, },
360 { 26, 27, 28, -1, -1, -1, -1, -1, },
362 memcpy(rc->books, a, sizeof a);
364 ready_residue(rc, venc);
367 venc->mappings = av_malloc(sizeof(mapping_t) * venc->nmappings);
370 mc = &venc->mappings[0];
372 mc->mux = av_malloc(sizeof(int) * venc->channels);
373 for (i = 0; i < venc->channels; i++)
375 mc->floor = av_malloc(sizeof(int) * mc->submaps);
376 mc->residue = av_malloc(sizeof(int) * mc->submaps);
377 for (i = 0; i < mc->submaps; i++) {
381 mc->coupling_steps = venc->channels == 2 ? 1 : 0;
382 mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps);
383 mc->angle = av_malloc(sizeof(int) * mc->coupling_steps);
384 if (mc->coupling_steps) {
385 mc->magnitude[0] = 0;
390 venc->modes = av_malloc(sizeof(vorbis_mode_t) * venc->nmodes);
393 venc->modes[0].blockflag = 0;
394 venc->modes[0].mapping = 0;
396 venc->have_saved = 0;
397 venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
398 venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
399 venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
400 venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
402 venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
403 venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
405 ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0);
406 ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0);
409 static void put_float(PutBitContext * pb, float f) {
412 mant = (int)ldexp(frexp(f, &exp), 20);
414 if (mant < 0) { res |= (1 << 31); mant = -mant; }
415 res |= mant | (exp << 21);
416 put_bits(pb, 32, res);
419 static void put_codebook_header(PutBitContext * pb, codebook_t * cb) {
423 put_bits(pb, 24, 0x564342); //magic
424 put_bits(pb, 16, cb->ndimentions);
425 put_bits(pb, 24, cb->nentries);
427 for (i = 1; i < cb->nentries; i++)
428 if (cb->lens[i] < cb->lens[i-1]) break;
429 if (i == cb->nentries)
432 put_bits(pb, 1, ordered);
434 int len = cb->lens[0];
435 put_bits(pb, 5, len - 1);
437 while (i < cb->nentries) {
439 for (j = 0; j+i < cb->nentries; j++)
440 if (cb->lens[j+i] != len) break;
441 put_bits(pb, ilog(cb->nentries - i), j);
447 for (i = 0; i < cb->nentries; i++)
448 if (!cb->lens[i]) break;
449 if (i != cb->nentries)
451 put_bits(pb, 1, sparse);
453 for (i = 0; i < cb->nentries; i++) {
454 if (sparse) put_bits(pb, 1, !!cb->lens[i]);
455 if (cb->lens[i]) put_bits(pb, 5, cb->lens[i] - 1);
459 put_bits(pb, 4, cb->lookup);
461 int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
462 int bits = ilog(cb->quantlist[0]);
464 for (i = 1; i < tmp; i++)
465 bits = FFMAX(bits, ilog(cb->quantlist[i]));
467 put_float(pb, cb->min);
468 put_float(pb, cb->delta);
470 put_bits(pb, 4, bits - 1);
471 put_bits(pb, 1, cb->seq_p);
473 for (i = 0; i < tmp; i++)
474 put_bits(pb, bits, cb->quantlist[i]);
478 static void put_floor_header(PutBitContext * pb, floor_t * fc) {
481 put_bits(pb, 16, 1); // type, only floor1 is supported
483 put_bits(pb, 5, fc->partitions);
485 for (i = 0; i < fc->partitions; i++)
486 put_bits(pb, 4, fc->partition_to_class[i]);
488 for (i = 0; i < fc->nclasses; i++) {
491 put_bits(pb, 3, fc->classes[i].dim - 1);
492 put_bits(pb, 2, fc->classes[i].subclass);
494 if (fc->classes[i].subclass)
495 put_bits(pb, 8, fc->classes[i].masterbook);
497 books = (1 << fc->classes[i].subclass);
499 for (j = 0; j < books; j++)
500 put_bits(pb, 8, fc->classes[i].books[j] + 1);
503 put_bits(pb, 2, fc->multiplier - 1);
504 put_bits(pb, 4, fc->rangebits);
506 for (i = 2; i < fc->values; i++)
507 put_bits(pb, fc->rangebits, fc->list[i].x);
510 static void put_residue_header(PutBitContext * pb, residue_t * rc) {
513 put_bits(pb, 16, rc->type);
515 put_bits(pb, 24, rc->begin);
516 put_bits(pb, 24, rc->end);
517 put_bits(pb, 24, rc->partition_size - 1);
518 put_bits(pb, 6, rc->classifications - 1);
519 put_bits(pb, 8, rc->classbook);
521 for (i = 0; i < rc->classifications; i++) {
523 for (j = 0; j < 8; j++)
524 tmp |= (rc->books[i][j] != -1) << j;
526 put_bits(pb, 3, tmp & 7);
527 put_bits(pb, 1, tmp > 7);
530 put_bits(pb, 5, tmp >> 3);
533 for (i = 0; i < rc->classifications; i++) {
535 for (j = 0; j < 8; j++)
536 if (rc->books[i][j] != -1)
537 put_bits(pb, 8, rc->books[i][j]);
541 static int put_main_header(venc_context_t * venc, uint8_t ** out) {
544 uint8_t buffer[50000] = {0}, * p = buffer;
545 int buffer_len = sizeof buffer;
548 // identification header
549 init_put_bits(&pb, p, buffer_len);
550 put_bits(&pb, 8, 1); //magic
551 for (i = 0; "vorbis"[i]; i++)
552 put_bits(&pb, 8, "vorbis"[i]);
553 put_bits(&pb, 32, 0); // version
554 put_bits(&pb, 8, venc->channels);
555 put_bits(&pb, 32, venc->sample_rate);
556 put_bits(&pb, 32, 0); // bitrate
557 put_bits(&pb, 32, 0); // bitrate
558 put_bits(&pb, 32, 0); // bitrate
559 put_bits(&pb, 4, venc->log2_blocksize[0]);
560 put_bits(&pb, 4, venc->log2_blocksize[1]);
561 put_bits(&pb, 1, 1); // framing
564 hlens[0] = (put_bits_count(&pb) + 7) / 8;
565 buffer_len -= hlens[0];
569 init_put_bits(&pb, p, buffer_len);
570 put_bits(&pb, 8, 3); //magic
571 for (i = 0; "vorbis"[i]; i++)
572 put_bits(&pb, 8, "vorbis"[i]);
573 put_bits(&pb, 32, 0); // vendor length TODO
574 put_bits(&pb, 32, 0); // amount of comments
575 put_bits(&pb, 1, 1); // framing
578 hlens[1] = (put_bits_count(&pb) + 7) / 8;
579 buffer_len -= hlens[1];
583 init_put_bits(&pb, p, buffer_len);
584 put_bits(&pb, 8, 5); //magic
585 for (i = 0; "vorbis"[i]; i++)
586 put_bits(&pb, 8, "vorbis"[i]);
589 put_bits(&pb, 8, venc->ncodebooks - 1);
590 for (i = 0; i < venc->ncodebooks; i++)
591 put_codebook_header(&pb, &venc->codebooks[i]);
593 // time domain, reserved, zero
595 put_bits(&pb, 16, 0);
598 put_bits(&pb, 6, venc->nfloors - 1);
599 for (i = 0; i < venc->nfloors; i++)
600 put_floor_header(&pb, &venc->floors[i]);
603 put_bits(&pb, 6, venc->nresidues - 1);
604 for (i = 0; i < venc->nresidues; i++)
605 put_residue_header(&pb, &venc->residues[i]);
608 put_bits(&pb, 6, venc->nmappings - 1);
609 for (i = 0; i < venc->nmappings; i++) {
610 mapping_t * mc = &venc->mappings[i];
612 put_bits(&pb, 16, 0); // mapping type
614 put_bits(&pb, 1, mc->submaps > 1);
616 put_bits(&pb, 4, mc->submaps - 1);
618 put_bits(&pb, 1, !!mc->coupling_steps);
619 if (mc->coupling_steps) {
620 put_bits(&pb, 8, mc->coupling_steps - 1);
621 for (j = 0; j < mc->coupling_steps; j++) {
622 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
623 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
627 put_bits(&pb, 2, 0); // reserved
630 for (j = 0; j < venc->channels; j++)
631 put_bits(&pb, 4, mc->mux[j]);
633 for (j = 0; j < mc->submaps; j++) {
634 put_bits(&pb, 8, 0); // reserved time configuration
635 put_bits(&pb, 8, mc->floor[j]);
636 put_bits(&pb, 8, mc->residue[j]);
641 put_bits(&pb, 6, venc->nmodes - 1);
642 for (i = 0; i < venc->nmodes; i++) {
643 put_bits(&pb, 1, venc->modes[i].blockflag);
644 put_bits(&pb, 16, 0); // reserved window type
645 put_bits(&pb, 16, 0); // reserved transform type
646 put_bits(&pb, 8, venc->modes[i].mapping);
649 put_bits(&pb, 1, 1); // framing
652 hlens[2] = (put_bits_count(&pb) + 7) / 8;
654 len = hlens[0] + hlens[1] + hlens[2];
655 p = *out = av_mallocz(64 + len + len/255);
658 p += av_xiphlacing(p, hlens[0]);
659 p += av_xiphlacing(p, hlens[1]);
661 for (i = 0; i < 3; i++) {
662 memcpy(p, buffer + buffer_len, hlens[i]);
664 buffer_len += hlens[i];
670 static float get_floor_average(floor_t * fc, float * coeffs, int i) {
671 int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
672 int end = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
676 for (j = begin; j < end; j++)
677 average += fabs(coeffs[j]);
678 return average / (end - begin);
681 static void floor_fit(venc_context_t * venc, floor_t * fc, float * coeffs, uint_fast16_t * posts, int samples) {
682 int range = 255 / fc->multiplier + 1;
684 float tot_average = 0.;
685 float averages[fc->values];
686 for (i = 0; i < fc->values; i++){
687 averages[i] = get_floor_average(fc, coeffs, i);
688 tot_average += averages[i];
690 tot_average /= fc->values;
691 tot_average /= venc->quality;
693 for (i = 0; i < fc->values; i++) {
694 int position = fc->list[fc->list[i].sort].x;
695 float average = averages[i];
698 average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC!
699 for (j = 0; j < range - 1; j++)
700 if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average) break;
701 posts[fc->list[i].sort] = j;
705 static int render_point(int x0, int y0, int x1, int y1, int x) {
706 return y0 + (x - x0) * (y1 - y0) / (x1 - x0);
709 static void floor_encode(venc_context_t * venc, floor_t * fc, PutBitContext * pb, uint_fast16_t * posts, float * floor, int samples) {
710 int range = 255 / fc->multiplier + 1;
711 int coded[fc->values]; // first 2 values are unused
714 put_bits(pb, 1, 1); // non zero
715 put_bits(pb, ilog(range - 1), posts[0]);
716 put_bits(pb, ilog(range - 1), posts[1]);
717 coded[0] = coded[1] = 1;
719 for (i = 2; i < fc->values; i++) {
720 int predicted = render_point(fc->list[fc->list[i].low].x,
721 posts[fc->list[i].low],
722 fc->list[fc->list[i].high].x,
723 posts[fc->list[i].high],
725 int highroom = range - predicted;
726 int lowroom = predicted;
727 int room = FFMIN(highroom, lowroom);
728 if (predicted == posts[i]) {
729 coded[i] = 0; // must be used later as flag!
732 if (!coded[fc->list[i].low ]) coded[fc->list[i].low ] = -1;
733 if (!coded[fc->list[i].high]) coded[fc->list[i].high] = -1;
735 if (posts[i] > predicted) {
736 if (posts[i] - predicted > room)
737 coded[i] = posts[i] - predicted + lowroom;
739 coded[i] = (posts[i] - predicted) << 1;
741 if (predicted - posts[i] > room)
742 coded[i] = predicted - posts[i] + highroom - 1;
744 coded[i] = ((predicted - posts[i]) << 1) - 1;
749 for (i = 0; i < fc->partitions; i++) {
750 floor_class_t * c = &fc->classes[fc->partition_to_class[i]];
751 int k, cval = 0, csub = 1<<c->subclass;
753 codebook_t * book = &venc->codebooks[c->masterbook];
755 for (k = 0; k < c->dim; k++) {
757 for (l = 0; l < csub; l++) {
759 if (c->books[l] != -1)
760 maxval = venc->codebooks[c->books[l]].nentries;
761 // coded could be -1, but this still works, cause that is 0
762 if (coded[counter + k] < maxval) break;
766 cshift += c->subclass;
768 put_codeword(pb, book, cval);
770 for (k = 0; k < c->dim; k++) {
771 int book = c->books[cval & (csub-1)];
772 int entry = coded[counter++];
773 cval >>= c->subclass;
774 if (book == -1) continue;
775 if (entry == -1) entry = 0;
776 put_codeword(pb, &venc->codebooks[book], entry);
780 ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded, fc->multiplier, floor, samples);
783 static float * put_vector(codebook_t * book, PutBitContext * pb, float * num) {
785 float distance = FLT_MAX;
786 assert(book->dimentions);
787 for (i = 0; i < book->nentries; i++) {
788 float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
790 if (!book->lens[i]) continue;
791 for (j = 0; j < book->ndimentions; j++)
792 d -= vec[j] * num[j];
798 put_codeword(pb, book, entry);
799 return &book->dimentions[entry * book->ndimentions];
802 static void residue_encode(venc_context_t * venc, residue_t * rc, PutBitContext * pb, float * coeffs, int samples, int real_ch) {
803 int pass, i, j, p, k;
804 int psize = rc->partition_size;
805 int partitions = (rc->end - rc->begin) / psize;
806 int channels = (rc->type == 2) ? 1 : real_ch;
807 int classes[channels][partitions];
808 int classwords = venc->codebooks[rc->classbook].ndimentions;
810 assert(rc->type == 2);
811 assert(real_ch == 2);
812 for (p = 0; p < partitions; p++) {
813 float max1 = 0., max2 = 0.;
814 int s = rc->begin + p * psize;
815 for (k = s; k < s + psize; k += 2) {
816 max1 = FFMAX(max1, fabs(coeffs[ k / real_ch]));
817 max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
820 for (i = 0; i < rc->classifications - 1; i++) {
821 if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1]) break;
826 for (pass = 0; pass < 8; pass++) {
828 while (p < partitions) {
830 for (j = 0; j < channels; j++) {
831 codebook_t * book = &venc->codebooks[rc->classbook];
833 for (i = 0; i < classwords; i++) {
834 entry *= rc->classifications;
835 entry += classes[j][p + i];
837 put_codeword(pb, book, entry);
839 for (i = 0; i < classwords && p < partitions; i++, p++) {
840 for (j = 0; j < channels; j++) {
841 int nbook = rc->books[classes[j][p]][pass];
842 codebook_t * book = &venc->codebooks[nbook];
843 float * buf = coeffs + samples*j + rc->begin + p*psize;
844 if (nbook == -1) continue;
846 assert(rc->type == 0 || rc->type == 2);
847 assert(!(psize % book->ndimentions));
850 for (k = 0; k < psize; k += book->ndimentions) {
851 float * a = put_vector(book, pb, &buf[k]);
853 for (l = 0; l < book->ndimentions; l++)
857 int s = rc->begin + p * psize, a1, b1;
858 a1 = (s % real_ch) * samples;
860 s = real_ch * samples;
861 for (k = 0; k < psize; k += book->ndimentions) {
862 int dim, a2 = a1, b2 = b1;
863 float vec[book->ndimentions], * pv = vec;
864 for (dim = book->ndimentions; dim--; ) {
865 *pv++ = coeffs[a2 + b2];
866 if ((a2 += samples) == s) {
871 pv = put_vector(book, pb, vec);
872 for (dim = book->ndimentions; dim--; ) {
873 coeffs[a1 + b1] -= *pv++;
874 if ((a1 += samples) == s) {
887 static int apply_window_and_mdct(venc_context_t * venc, signed short * audio, int samples) {
889 const float * win = venc->win[0];
890 int window_len = 1 << (venc->log2_blocksize[0] - 1);
891 float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
894 if (!venc->have_saved && !samples) return 0;
896 if (venc->have_saved) {
897 for (channel = 0; channel < venc->channels; channel++) {
898 memcpy(venc->samples + channel*window_len*2, venc->saved + channel*window_len, sizeof(float)*window_len);
901 for (channel = 0; channel < venc->channels; channel++) {
902 memset(venc->samples + channel*window_len*2, 0, sizeof(float)*window_len);
907 for (channel = 0; channel < venc->channels; channel++) {
908 float * offset = venc->samples + channel*window_len*2 + window_len;
910 for (i = 0; i < samples; i++, j += venc->channels)
911 offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped
914 for (channel = 0; channel < venc->channels; channel++) {
915 memset(venc->samples + channel*window_len*2 + window_len, 0, sizeof(float)*window_len);
919 for (channel = 0; channel < venc->channels; channel++) {
920 ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel*window_len, venc->samples + channel*window_len*2);
924 for (channel = 0; channel < venc->channels; channel++) {
925 float * offset = venc->saved + channel*window_len;
927 for (i = 0; i < samples; i++, j += venc->channels)
928 offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped
930 venc->have_saved = 1;
932 venc->have_saved = 0;
937 static av_cold int vorbis_encode_init(AVCodecContext * avccontext)
939 venc_context_t * venc = avccontext->priv_data;
941 if (avccontext->channels != 2) {
942 av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
946 create_vorbis_context(venc, avccontext);
948 if (avccontext->flags & CODEC_FLAG_QSCALE)
949 venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
952 venc->quality *= venc->quality;
954 avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
956 avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);
958 avccontext->coded_frame = avcodec_alloc_frame();
959 avccontext->coded_frame->key_frame = 1;
964 static int vorbis_encode_frame(AVCodecContext * avccontext, unsigned char * packets, int buf_size, void *data)
966 venc_context_t * venc = avccontext->priv_data;
967 signed short * audio = data;
968 int samples = data ? avccontext->frame_size : 0;
969 vorbis_mode_t * mode;
974 if (!apply_window_and_mdct(venc, audio, samples)) return 0;
975 samples = 1 << (venc->log2_blocksize[0] - 1);
977 init_put_bits(&pb, packets, buf_size);
979 put_bits(&pb, 1, 0); // magic bit
981 put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
983 mode = &venc->modes[0];
984 mapping = &venc->mappings[mode->mapping];
985 if (mode->blockflag) {
990 for (i = 0; i < venc->channels; i++) {
991 floor_t * fc = &venc->floors[mapping->floor[mapping->mux[i]]];
992 uint_fast16_t posts[fc->values];
993 floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
994 floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
997 for (i = 0; i < venc->channels * samples; i++) {
998 venc->coeffs[i] /= venc->floor[i];
1001 for (i = 0; i < mapping->coupling_steps; i++) {
1002 float * mag = venc->coeffs + mapping->magnitude[i] * samples;
1003 float * ang = venc->coeffs + mapping->angle[i] * samples;
1005 for (j = 0; j < samples; j++) {
1008 if (mag[j] > 0) ang[j] = -ang[j];
1009 if (ang[j] < 0) mag[j] = a;
1013 residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]], &pb, venc->coeffs, samples, venc->channels);
1015 avccontext->coded_frame->pts = venc->sample_count;
1016 venc->sample_count += avccontext->frame_size;
1017 flush_put_bits(&pb);
1018 return (put_bits_count(&pb) + 7) / 8;
1022 static av_cold int vorbis_encode_close(AVCodecContext * avccontext)
1024 venc_context_t * venc = avccontext->priv_data;
1027 if (venc->codebooks)
1028 for (i = 0; i < venc->ncodebooks; i++) {
1029 av_freep(&venc->codebooks[i].lens);
1030 av_freep(&venc->codebooks[i].codewords);
1031 av_freep(&venc->codebooks[i].quantlist);
1032 av_freep(&venc->codebooks[i].dimentions);
1033 av_freep(&venc->codebooks[i].pow2);
1035 av_freep(&venc->codebooks);
1038 for (i = 0; i < venc->nfloors; i++) {
1040 if (venc->floors[i].classes)
1041 for (j = 0; j < venc->floors[i].nclasses; j++)
1042 av_freep(&venc->floors[i].classes[j].books);
1043 av_freep(&venc->floors[i].classes);
1044 av_freep(&venc->floors[i].partition_to_class);
1045 av_freep(&venc->floors[i].list);
1047 av_freep(&venc->floors);
1050 for (i = 0; i < venc->nresidues; i++) {
1051 av_freep(&venc->residues[i].books);
1052 av_freep(&venc->residues[i].maxes);
1054 av_freep(&venc->residues);
1057 for (i = 0; i < venc->nmappings; i++) {
1058 av_freep(&venc->mappings[i].mux);
1059 av_freep(&venc->mappings[i].floor);
1060 av_freep(&venc->mappings[i].residue);
1061 av_freep(&venc->mappings[i].magnitude);
1062 av_freep(&venc->mappings[i].angle);
1064 av_freep(&venc->mappings);
1066 av_freep(&venc->modes);
1068 av_freep(&venc->saved);
1069 av_freep(&venc->samples);
1070 av_freep(&venc->floor);
1071 av_freep(&venc->coeffs);
1073 ff_mdct_end(&venc->mdct[0]);
1074 ff_mdct_end(&venc->mdct[1]);
1076 av_freep(&avccontext->coded_frame);
1077 av_freep(&avccontext->extradata);
1082 AVCodec vorbis_encoder = {
1086 sizeof(venc_context_t),
1088 vorbis_encode_frame,
1089 vorbis_encode_close,
1090 .capabilities= CODEC_CAP_DELAY,
1091 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
1092 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),