FFmpeg: libavcodec/vorbisenc.c Source File

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vorbisenc.c

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1 /*

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 */

21 /**

22 * @file

23 * Native Vorbis encoder.

24 * @author Oded Shimon <ods15@ods15.dyndns.org>

25 */

27 #include <float.h>

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"

36 #define BITSTREAM_WRITER_LE

37 #include "put_bits.h"

39 #undef NDEBUG

40 #include <assert.h>

42 typedef struct vorbis_enc_codebook {

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;

56 typedef struct vorbis_enc_floor_class {

57 int dim;

58 int subclass;

59 int masterbook;

60 int *books;

61 } vorbis_enc_floor_class;

63 typedef struct vorbis_enc_floor {

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;

74 typedef struct vorbis_enc_residue {

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;

85 typedef struct vorbis_enc_mapping {

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;

95 typedef struct vorbis_enc_mode {

96 int blockflag;

97 int mapping;

98 } vorbis_enc_mode;

100 typedef struct vorbis_enc_context {

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 Sun Mar 8 2015 02:35:02 for FFmpeg by doxygen 1.8.2