FFmpeg: libavformat/mux.c Source File

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libavformat

mux.c

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1 /*

2 * muxing functions for use within FFmpeg

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 #include "avformat.h"

23 #include "avio_internal.h"

24 #include "internal.h"

25 #include "libavcodec/internal.h"

26 #include "libavcodec/bytestream.h"

27 #include "libavutil/opt.h"

28 #include "libavutil/dict.h"

29 #include "libavutil/pixdesc.h"

30 #include "libavutil/timestamp.h"

31 #include "metadata.h"

32 #include "id3v2.h"

33 #include "libavutil/avassert.h"

34 #include "libavutil/avstring.h"

35 #include "libavutil/internal.h"

36 #include "libavutil/mathematics.h"

37 #include "libavutil/parseutils.h"

38 #include "libavutil/time.h"

39 #include "riff.h"

40 #include "audiointerleave.h"

41 #include "url.h"

42 #include <stdarg.h>

43 #if CONFIG_NETWORK

44 #include "network.h"

45 #endif

47 #undef NDEBUG

48 #include <assert.h>

50 /**

51 * @file

52 * muxing functions for use within libavformat

53 */

55 /* fraction handling */

57 /**

58 * f = val + (num / den) + 0.5.

59 *

60 * 'num' is normalized so that it is such as 0 <= num < den.

61 *

62 * @param f fractional number

63 * @param val integer value

64 * @param num must be >= 0

65 * @param den must be >= 1

66 */

67 static void frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)

68 {

69 num += (den >> 1);

70 if (num >= den) {

71 val += num / den;

72 num = num % den;

73 }

74 f->val = val;

75 f->num = num;

76 f->den = den;

77 }

79 /**

80 * Fractional addition to f: f = f + (incr / f->den).

81 *

82 * @param f fractional number

83 * @param incr increment, can be positive or negative

84 */

85 static void frac_add(AVFrac *f, int64_t incr)

86 {

87 int64_t num, den;

89 num = f->num + incr;

90 den = f->den;

91 if (num < 0) {

92 f->val += num / den;

93 num = num % den;

94 if (num < 0) {

95 num += den;

96 f->val--;

97 }

98 } else if (num >= den) {

99 f->val += num / den;

100 num = num % den;

101 }

102 f->num = num;

103 }

104

105 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precission)

106 {

107 AVRational q;

108 int j;

109

110 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

111 q = (AVRational){1, st->codec->sample_rate};

112 } else {

113 q = st->codec->time_base;

114 }

115 for (j=2; j<14; j+= 1+(j>2))

116 while (q.den / q.num < min_precission && q.num % j == 0)

117 q.num /= j;

118 while (q.den / q.num < min_precission && q.den < (1<<24))

119 q.den <<= 1;

120

121 return q;

122 }

123

124 int avformat_alloc_output_context2(AVFormatContext **avctx, AVOutputFormat *oformat,

125 const char *format, const char *filename)

126 {

127 AVFormatContext *s = avformat_alloc_context();

128 int ret = 0;

129

130 *avctx = NULL;

131 if (!s)

132 goto nomem;

133

134 if (!oformat) {

135 if (format) {

136 oformat = av_guess_format(format, NULL, NULL);

137 if (!oformat) {

138 av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not a suitable output format\n", format);

139 ret = AVERROR(EINVAL);

140 goto error;

141 }

142 } else {

143 oformat = av_guess_format(NULL, filename, NULL);

144 if (!oformat) {

145 ret = AVERROR(EINVAL);

146 av_log(s, AV_LOG_ERROR, "Unable to find a suitable output format for '%s'\n",

147 filename);

148 goto error;

149 }

150 }

151 }

152

153 s->oformat = oformat;

154 if (s->oformat->priv_data_size > 0) {

155 s->priv_data = av_mallocz(s->oformat->priv_data_size);

156 if (!s->priv_data)

157 goto nomem;

158 if (s->oformat->priv_class) {

159 *(const AVClass**)s->priv_data= s->oformat->priv_class;

160 av_opt_set_defaults(s->priv_data);

161 }

162 } else

163 s->priv_data = NULL;

164

165 if (filename)

166 av_strlcpy(s->filename, filename, sizeof(s->filename));

167 *avctx = s;

168 return 0;

169 nomem:

170 av_log(s, AV_LOG_ERROR, "Out of memory\n");

171 ret = AVERROR(ENOMEM);

172 error:

173 avformat_free_context(s);

174 return ret;

175 }

176

177 #if FF_API_ALLOC_OUTPUT_CONTEXT

178 AVFormatContext *avformat_alloc_output_context(const char *format,

179 AVOutputFormat *oformat, const char *filename)

180 {

181 AVFormatContext *avctx;

182 int ret = avformat_alloc_output_context2(&avctx, oformat, format, filename);

183 return ret < 0 ? NULL : avctx;

184 }

185 #endif

186

187 static int validate_codec_tag(AVFormatContext *s, AVStream *st)

188 {

189 const AVCodecTag *avctag;

190 int n;

191 enum AVCodecID id = AV_CODEC_ID_NONE;

192 unsigned int tag = 0;

193

194 /**

195 * Check that tag + id is in the table

196 * If neither is in the table -> OK

197 * If tag is in the table with another id -> FAIL

198 * If id is in the table with another tag -> FAIL unless strict < normal

199 */

200 for (n = 0; s->oformat->codec_tag[n]; n++) {

201 avctag = s->oformat->codec_tag[n];

202 while (avctag->id != AV_CODEC_ID_NONE) {

203 if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codec->codec_tag)) {

204 id = avctag->id;

205 if (id == st->codec->codec_id)

206 return 1;

207 }

208 if (avctag->id == st->codec->codec_id)

209 tag = avctag->tag;

210 avctag++;

211 }

212 }

213 if (id != AV_CODEC_ID_NONE)

214 return 0;

215 if (tag && (st->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL))

216 return 0;

217 return 1;

218 }

219

220

221 static int init_muxer(AVFormatContext *s, AVDictionary **options)

222 {

223 int ret = 0, i;

224 AVStream *st;

225 AVDictionary *tmp = NULL;

226 AVCodecContext *codec = NULL;

227 AVOutputFormat *of = s->oformat;

228

229 if (options)

230 av_dict_copy(&tmp, *options, 0);

231

232 if ((ret = av_opt_set_dict(s, &tmp)) < 0)

233 goto fail;

234 if (s->priv_data && s->oformat->priv_class && *(const AVClass**)s->priv_data==s->oformat->priv_class &&

235 (ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)

236 goto fail;

237

238 // some sanity checks

239 if (s->nb_streams == 0 && !(of->flags & AVFMT_NOSTREAMS)) {

240 av_log(s, AV_LOG_ERROR, "no streams\n");

241 ret = AVERROR(EINVAL);

242 goto fail;

243 }

244

245 for (i = 0; i < s->nb_streams; i++) {

246 st = s->streams[i];

247 codec = st->codec;

248

249 switch (codec->codec_type) {

250 case AVMEDIA_TYPE_AUDIO:

251 if (codec->sample_rate <= 0) {

252 av_log(s, AV_LOG_ERROR, "sample rate not set\n");

253 ret = AVERROR(EINVAL);

254 goto fail;

255 }

256 if (!codec->block_align)

257 codec->block_align = codec->channels *

258 av_get_bits_per_sample(codec->codec_id) >> 3;

259 break;

260 case AVMEDIA_TYPE_VIDEO:

261 if (codec->time_base.num <= 0 ||

262 codec->time_base.den <= 0) { //FIXME audio too?

263 av_log(s, AV_LOG_ERROR, "time base not set\n");

264 ret = AVERROR(EINVAL);

265 goto fail;

266 }

267

268 if ((codec->width <= 0 || codec->height <= 0) &&

269 !(of->flags & AVFMT_NODIMENSIONS)) {

270 av_log(s, AV_LOG_ERROR, "dimensions not set\n");

271 ret = AVERROR(EINVAL);

272 goto fail;

273 }

274 if (av_cmp_q(st->sample_aspect_ratio, codec->sample_aspect_ratio)

275 && FFABS(av_q2d(st->sample_aspect_ratio) - av_q2d(codec->sample_aspect_ratio)) > 0.004*av_q2d(st->sample_aspect_ratio)

276 ) {

277 if (st->sample_aspect_ratio.num != 0 &&

278 st->sample_aspect_ratio.den != 0 &&

279 codec->sample_aspect_ratio.den != 0 &&

280 codec->sample_aspect_ratio.den != 0) {

281 av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "

282 "(%d/%d) and encoder layer (%d/%d)\n",

283 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,

284 codec->sample_aspect_ratio.num,

285 codec->sample_aspect_ratio.den);

286 ret = AVERROR(EINVAL);

287 goto fail;

288 }

289 }

290 break;

291 }

292

293 if (of->codec_tag) {

294 if ( codec->codec_tag

295 && codec->codec_id == AV_CODEC_ID_RAWVIDEO

296 && ( av_codec_get_tag(of->codec_tag, codec->codec_id) == 0

297 || av_codec_get_tag(of->codec_tag, codec->codec_id) == MKTAG('r', 'a', 'w', ' '))

298 && !validate_codec_tag(s, st)) {

299 // the current rawvideo encoding system ends up setting

300 // the wrong codec_tag for avi/mov, we override it here

301 codec->codec_tag = 0;

302 }

303 if (codec->codec_tag) {

304 if (!validate_codec_tag(s, st)) {

305 char tagbuf[32], tagbuf2[32];

306 av_get_codec_tag_string(tagbuf, sizeof(tagbuf), codec->codec_tag);

307 av_get_codec_tag_string(tagbuf2, sizeof(tagbuf2), av_codec_get_tag(s->oformat->codec_tag, codec->codec_id));

308 av_log(s, AV_LOG_ERROR,

309 "Tag %s/0x%08x incompatible with output codec id '%d' (%s)\n",

310 tagbuf, codec->codec_tag, codec->codec_id, tagbuf2);

311 ret = AVERROR_INVALIDDATA;

312 goto fail;

313 }

314 } else

315 codec->codec_tag = av_codec_get_tag(of->codec_tag, codec->codec_id);

316 }

317

318 if (of->flags & AVFMT_GLOBALHEADER &&

319 !(codec->flags & CODEC_FLAG_GLOBAL_HEADER))

320 av_log(s, AV_LOG_WARNING,

321 "Codec for stream %d does not use global headers "

322 "but container format requires global headers\n", i);

323 }

324

325 if (!s->priv_data && of->priv_data_size > 0) {

326 s->priv_data = av_mallocz(of->priv_data_size);

327 if (!s->priv_data) {

328 ret = AVERROR(ENOMEM);

329 goto fail;

330 }

331 if (of->priv_class) {

332 *(const AVClass **)s->priv_data = of->priv_class;

333 av_opt_set_defaults(s->priv_data);

334 if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)

335 goto fail;

336 }

337 }

338

339 /* set muxer identification string */

340 if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {

341 av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);

342 }

343

344 if (options) {

345 av_dict_free(options);

346 *options = tmp;

347 }

348

349 return 0;

350

351 fail:

352 av_dict_free(&tmp);

353 return ret;

354 }

355

356 static int init_pts(AVFormatContext *s)

357 {

358 int i;

359 AVStream *st;

360

361 /* init PTS generation */

362 for (i = 0; i < s->nb_streams; i++) {

363 int64_t den = AV_NOPTS_VALUE;

364 st = s->streams[i];

365

366 switch (st->codec->codec_type) {

367 case AVMEDIA_TYPE_AUDIO:

368 den = (int64_t)st->time_base.num * st->codec->sample_rate;

369 break;

370 case AVMEDIA_TYPE_VIDEO:

371 den = (int64_t)st->time_base.num * st->codec->time_base.den;

372 break;

373 default:

374 break;

375 }

376 if (den != AV_NOPTS_VALUE) {

377 if (den <= 0)

378 return AVERROR_INVALIDDATA;

379

380 frac_init(&st->pts, 0, 0, den);

381 }

382 }

383

384 return 0;

385 }

386

387 int avformat_write_header(AVFormatContext *s, AVDictionary **options)

388 {

389 int ret = 0;

390

391 if (ret = init_muxer(s, options))

392 return ret;

393

394 if (s->oformat->write_header) {

395 ret = s->oformat->write_header(s);

396 if (ret >= 0 && s->pb && s->pb->error < 0)

397 ret = s->pb->error;

398 if (ret < 0)

399 return ret;

400 }

401

402 if ((ret = init_pts(s)) < 0)

403 return ret;

404

405 if (s->avoid_negative_ts < 0) {

406 if (s->oformat->flags & (AVFMT_TS_NEGATIVE | AVFMT_NOTIMESTAMPS)) {

407 s->avoid_negative_ts = 0;

408 } else

409 s->avoid_negative_ts = 1;

410 }

411

412 return 0;

413 }

414

415 //FIXME merge with compute_pkt_fields

416 static int compute_pkt_fields2(AVFormatContext *s, AVStream *st, AVPacket *pkt)

417 {

418 int delay = FFMAX(st->codec->has_b_frames, st->codec->max_b_frames > 0);

419 int num, den, frame_size, i;

420

421 av_dlog(s, "compute_pkt_fields2: pts:%s dts:%s cur_dts:%s b:%d size:%d st:%d\n",

422 av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts), delay, pkt->size, pkt->stream_index);

423

424 /* duration field */

425 if (pkt->duration == 0) {

426 ff_compute_frame_duration(&num, &den, st, NULL, pkt);

427 if (den && num) {

428 pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);

429 }

430 }

431

432 if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay == 0)

433 pkt->pts = pkt->dts;

434

435 //XXX/FIXME this is a temporary hack until all encoders output pts

436 if ((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay) {

437 static int warned;

438 if (!warned) {

439 av_log(s, AV_LOG_WARNING, "Encoder did not produce proper pts, making some up.\n");

440 warned = 1;

441 }

442 pkt->dts =

443 // pkt->pts= st->cur_dts;

444 pkt->pts = st->pts.val;

445 }

446

447 //calculate dts from pts

448 if (pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {

449 st->pts_buffer[0] = pkt->pts;

450 for (i = 1; i < delay + 1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)

451 st->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;

452 for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)

453 FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);

454

455 pkt->dts = st->pts_buffer[0];

456 }

457

458 if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&

459 ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&

460 st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {

461 av_log(s, AV_LOG_ERROR,

462 "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %s >= %s\n",

463 st->index, av_ts2str(st->cur_dts), av_ts2str(pkt->dts));

464 return AVERROR(EINVAL);

465 }

466 if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {

467 av_log(s, AV_LOG_ERROR, "pts (%s) < dts (%s) in stream %d\n",

468 av_ts2str(pkt->pts), av_ts2str(pkt->dts), st->index);

469 return AVERROR(EINVAL);

470 }

471

472 av_dlog(s, "av_write_frame: pts2:%s dts2:%s\n",

473 av_ts2str(pkt->pts), av_ts2str(pkt->dts));

474 st->cur_dts = pkt->dts;

475 st->pts.val = pkt->dts;

476

477 /* update pts */

478 switch (st->codec->codec_type) {

479 case AVMEDIA_TYPE_AUDIO:

480 frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 1);

481

482 /* HACK/FIXME, we skip the initial 0 size packets as they are most

483 * likely equal to the encoder delay, but it would be better if we

484 * had the real timestamps from the encoder */

485 if (frame_size >= 0 && (pkt->size || st->pts.num != st->pts.den >> 1 || st->pts.val)) {

486 frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);

487 }

488 break;

489 case AVMEDIA_TYPE_VIDEO:

490 frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);

491 break;

492 default:

493 break;

494 }

495 return 0;

496 }

497

498 /**

499 * Make timestamps non negative, move side data from payload to internal struct, call muxer, and restore

500 * sidedata.

501 *

502 * FIXME: this function should NEVER get undefined pts/dts beside when the

503 * AVFMT_NOTIMESTAMPS is set.

504 * Those additional safety checks should be dropped once the correct checks

505 * are set in the callers.

506 */

507 static int write_packet(AVFormatContext *s, AVPacket *pkt)

508 {

509 int ret, did_split;

510

511 if (s->avoid_negative_ts > 0) {

512 AVStream *st = s->streams[pkt->stream_index];

513 int64_t offset = st->mux_ts_offset;

514

515 if (pkt->dts < 0 && pkt->dts != AV_NOPTS_VALUE && !s->offset) {

516 s->offset = -pkt->dts;

517 s->offset_timebase = st->time_base;

518 }

519

520 if (s->offset && !offset) {

521 offset = st->mux_ts_offset =

522 av_rescale_q_rnd(s->offset,

523 s->offset_timebase,

524 st->time_base,

525 AV_ROUND_UP);

526 }

527

528 if (pkt->dts != AV_NOPTS_VALUE)

529 pkt->dts += offset;

530 if (pkt->pts != AV_NOPTS_VALUE)

531 pkt->pts += offset;

532

533 av_assert2(pkt->dts == AV_NOPTS_VALUE || pkt->dts >= 0);

534 }

535

536 did_split = av_packet_split_side_data(pkt);

537 ret = s->oformat->write_packet(s, pkt);

538

539 if (s->flush_packets && s->pb && ret >= 0 && s->flags & AVFMT_FLAG_FLUSH_PACKETS)

540 avio_flush(s->pb);

541

542 if (did_split)

543 av_packet_merge_side_data(pkt);

544

545 return ret;

546 }

547

548 int av_write_frame(AVFormatContext *s, AVPacket *pkt)

549 {

550 int ret;

551

552 if (!pkt) {

553 if (s->oformat->flags & AVFMT_ALLOW_FLUSH) {

554 ret = s->oformat->write_packet(s, NULL);

555 if (s->flush_packets && s->pb && s->pb->error >= 0)

556 avio_flush(s->pb);

557 if (ret >= 0 && s->pb && s->pb->error < 0)

558 ret = s->pb->error;

559 return ret;

560 }

561 return 1;

562 }

563

564 ret = compute_pkt_fields2(s, s->streams[pkt->stream_index], pkt);

565

566 if (ret < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))

567 return ret;

568

569 ret = write_packet(s, pkt);

570 if (ret >= 0 && s->pb && s->pb->error < 0)

571 ret = s->pb->error;

572

573 if (ret >= 0)

574 s->streams[pkt->stream_index]->nb_frames++;

575 return ret;

576 }

577

578 #define CHUNK_START 0x1000

579

580 int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,

581 int (*compare)(AVFormatContext *, AVPacket *, AVPacket *))

582 {

583 AVPacketList **next_point, *this_pktl;

584 AVStream *st = s->streams[pkt->stream_index];

585 int chunked = s->max_chunk_size || s->max_chunk_duration;

586

587 this_pktl = av_mallocz(sizeof(AVPacketList));

588 if (!this_pktl)

589 return AVERROR(ENOMEM);

590 this_pktl->pkt = *pkt;

591 #if FF_API_DESTRUCT_PACKET

592 FF_DISABLE_DEPRECATION_WARNINGS

593 pkt->destruct = NULL; // do not free original but only the copy

594 FF_ENABLE_DEPRECATION_WARNINGS

595 #endif

596 pkt->buf = NULL;

597 av_dup_packet(&this_pktl->pkt); // duplicate the packet if it uses non-allocated memory

598 av_copy_packet_side_data(&this_pktl->pkt, &this_pktl->pkt); // copy side data

599

600 if (s->streams[pkt->stream_index]->last_in_packet_buffer) {

601 next_point = &(st->last_in_packet_buffer->next);

602 } else {

603 next_point = &s->packet_buffer;

604 }

605

606 if (chunked) {

607 uint64_t max= av_rescale_q_rnd(s->max_chunk_duration, AV_TIME_BASE_Q, st->time_base, AV_ROUND_UP);

608 st->interleaver_chunk_size += pkt->size;

609 st->interleaver_chunk_duration += pkt->duration;

610 if ( (s->max_chunk_size && st->interleaver_chunk_size > s->max_chunk_size)

611 || (max && st->interleaver_chunk_duration > max)) {

612 st->interleaver_chunk_size = 0;

613 this_pktl->pkt.flags |= CHUNK_START;

614 if (max && st->interleaver_chunk_duration > max) {

615 int64_t syncoffset = (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)*max/2;

616 int64_t syncto = av_rescale(pkt->dts + syncoffset, 1, max)*max - syncoffset;

617

618 st->interleaver_chunk_duration += (pkt->dts - syncto)/8 - max;

619 } else

620 st->interleaver_chunk_duration = 0;

621 }

622 }

623 if (*next_point) {

624 if (chunked && !(this_pktl->pkt.flags & CHUNK_START))

625 goto next_non_null;

626

627 if (compare(s, &s->packet_buffer_end->pkt, pkt)) {

628 while ( *next_point

629 && ((chunked && !((*next_point)->pkt.flags&CHUNK_START))

630 || !compare(s, &(*next_point)->pkt, pkt)))

631 next_point = &(*next_point)->next;

632 if (*next_point)

633 goto next_non_null;

634 } else {

635 next_point = &(s->packet_buffer_end->next);

636 }

637 }

638 av_assert1(!*next_point);

639

640 s->packet_buffer_end = this_pktl;

641 next_non_null:

642

643 this_pktl->next = *next_point;

644

645 s->streams[pkt->stream_index]->last_in_packet_buffer =

646 *next_point = this_pktl;

647 return 0;

648 }

649

650 static int interleave_compare_dts(AVFormatContext *s, AVPacket *next,

651 AVPacket *pkt)

652 {

653 AVStream *st = s->streams[pkt->stream_index];

654 AVStream *st2 = s->streams[next->stream_index];

655 int comp = av_compare_ts(next->dts, st2->time_base, pkt->dts,

656 st->time_base);

657 if (s->audio_preload && ((st->codec->codec_type == AVMEDIA_TYPE_AUDIO) != (st2->codec->codec_type == AVMEDIA_TYPE_AUDIO))) {

658 int64_t ts = av_rescale_q(pkt ->dts, st ->time_base, AV_TIME_BASE_Q) - s->audio_preload*(st ->codec->codec_type == AVMEDIA_TYPE_AUDIO);

659 int64_t ts2= av_rescale_q(next->dts, st2->time_base, AV_TIME_BASE_Q) - s->audio_preload*(st2->codec->codec_type == AVMEDIA_TYPE_AUDIO);

660 if (ts == ts2) {

661 ts= ( pkt ->dts* st->time_base.num*AV_TIME_BASE - s->audio_preload*(int64_t)(st ->codec->codec_type == AVMEDIA_TYPE_AUDIO)* st->time_base.den)*st2->time_base.den

662 -( next->dts*st2->time_base.num*AV_TIME_BASE - s->audio_preload*(int64_t)(st2->codec->codec_type == AVMEDIA_TYPE_AUDIO)*st2->time_base.den)* st->time_base.den;

663 ts2=0;

664 }

665 comp= (ts>ts2) - (ts<ts2);

666 }

667

668 if (comp == 0)

669 return pkt->stream_index < next->stream_index;

670 return comp > 0;

671 }

672

673 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,

674 AVPacket *pkt, int flush)

675 {

676 AVPacketList *pktl;

677 int stream_count = 0, noninterleaved_count = 0;

678 int64_t delta_dts_max = 0;

679 int i, ret;

680

681 if (pkt) {

682 ret = ff_interleave_add_packet(s, pkt, interleave_compare_dts);

683 if (ret < 0)

684 return ret;

685 }

686

687 for (i = 0; i < s->nb_streams; i++) {

688 if (s->streams[i]->last_in_packet_buffer) {

689 ++stream_count;

690 } else if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {

691 ++noninterleaved_count;

692 }

693 }

694

695 if (s->nb_streams == stream_count) {

696 flush = 1;

697 } else if (!flush) {

698 for (i=0; i < s->nb_streams; i++) {

699 if (s->streams[i]->last_in_packet_buffer) {

700 int64_t delta_dts =

701 av_rescale_q(s->streams[i]->last_in_packet_buffer->pkt.dts,

702 s->streams[i]->time_base,

703 AV_TIME_BASE_Q) -

704 av_rescale_q(s->packet_buffer->pkt.dts,

705 s->streams[s->packet_buffer->pkt.stream_index]->time_base,

706 AV_TIME_BASE_Q);

707 delta_dts_max= FFMAX(delta_dts_max, delta_dts);

708 }

709 }

710 if (s->nb_streams == stream_count+noninterleaved_count &&

711 delta_dts_max > 20*AV_TIME_BASE) {

712 av_log(s, AV_LOG_DEBUG, "flushing with %d noninterleaved\n", noninterleaved_count);

713 flush = 1;

714 }

715 }

716 if (stream_count && flush) {

717 AVStream *st;

718 pktl = s->packet_buffer;

719 *out = pktl->pkt;

720 st = s->streams[out->stream_index];

721

722 s->packet_buffer = pktl->next;

723 if (!s->packet_buffer)

724 s->packet_buffer_end = NULL;

725

726 if (st->last_in_packet_buffer == pktl)

727 st->last_in_packet_buffer = NULL;

728 av_freep(&pktl);

729

730 return 1;

731 } else {

732 av_init_packet(out);

733 return 0;

734 }

735 }

736

737 /**

738 * Interleave an AVPacket correctly so it can be muxed.

739 * @param out the interleaved packet will be output here

740 * @param in the input packet

741 * @param flush 1 if no further packets are available as input and all

742 * remaining packets should be output

743 * @return 1 if a packet was output, 0 if no packet could be output,

744 * < 0 if an error occurred

745 */

746 static int interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)

747 {

748 if (s->oformat->interleave_packet) {

749 int ret = s->oformat->interleave_packet(s, out, in, flush);

750 if (in)

751 av_free_packet(in);

752 return ret;

753 } else

754 return ff_interleave_packet_per_dts(s, out, in, flush);

755 }

756

757 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)

758 {

759 int ret, flush = 0;

760

761 if (pkt) {

762 AVStream *st = s->streams[pkt->stream_index];

763

764 //FIXME/XXX/HACK drop zero sized packets

765 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size == 0)

766 return 0;

767

768 av_dlog(s, "av_interleaved_write_frame size:%d dts:%s pts:%s\n",

769 pkt->size, av_ts2str(pkt->dts), av_ts2str(pkt->pts));

770 if ((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))

771 return ret;

772

773 if (pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))

774 return AVERROR(EINVAL);

775 } else {

776 av_dlog(s, "av_interleaved_write_frame FLUSH\n");

777 flush = 1;

778 }

779

780 for (;; ) {

781 AVPacket opkt;

782 int ret = interleave_packet(s, &opkt, pkt, flush);

783 if (ret <= 0) //FIXME cleanup needed for ret<0 ?

784 return ret;

785

786 ret = write_packet(s, &opkt);

787 if (ret >= 0)

788 s->streams[opkt.stream_index]->nb_frames++;

789

790 av_free_packet(&opkt);

791 pkt = NULL;

792

793 if (ret < 0)

794 return ret;

795 if(s->pb && s->pb->error)

796 return s->pb->error;

797 }

798 }

799

800 int av_write_trailer(AVFormatContext *s)

801 {

802 int ret, i;

803

804 for (;; ) {

805 AVPacket pkt;

806 ret = interleave_packet(s, &pkt, NULL, 1);

807 if (ret < 0) //FIXME cleanup needed for ret<0 ?

808 goto fail;

809 if (!ret)

810 break;

811

812 ret = write_packet(s, &pkt);

813 if (ret >= 0)

814 s->streams[pkt.stream_index]->nb_frames++;

815

816 av_free_packet(&pkt);

817

818 if (ret < 0)

819 goto fail;

820 if(s->pb && s->pb->error)

821 goto fail;

822 }

823

824 if (s->oformat->write_trailer)

825 ret = s->oformat->write_trailer(s);

826

827 fail:

828 if (s->pb)

829 avio_flush(s->pb);

830 if (ret == 0)

831 ret = s->pb ? s->pb->error : 0;

832 for (i = 0; i < s->nb_streams; i++) {

833 av_freep(&s->streams[i]->priv_data);

834 av_freep(&s->streams[i]->index_entries);

835 }

836 if (s->oformat->priv_class)

837 av_opt_free(s->priv_data);

838 av_freep(&s->priv_data);

839 return ret;

840 }

841

842 int av_get_output_timestamp(struct AVFormatContext *s, int stream,

843 int64_t *dts, int64_t *wall)

844 {

845 if (!s->oformat || !s->oformat->get_output_timestamp)

846 return AVERROR(ENOSYS);

847 s->oformat->get_output_timestamp(s, stream, dts, wall);

848 return 0;

849 }

850

851 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,

852 AVFormatContext *src)

853 {

854 AVPacket local_pkt;

855

856 local_pkt = *pkt;

857 local_pkt.stream_index = dst_stream;

858 if (pkt->pts != AV_NOPTS_VALUE)

859 local_pkt.pts = av_rescale_q(pkt->pts,

860 src->streams[pkt->stream_index]->time_base,

861 dst->streams[dst_stream]->time_base);

862 if (pkt->dts != AV_NOPTS_VALUE)

863 local_pkt.dts = av_rescale_q(pkt->dts,

864 src->streams[pkt->stream_index]->time_base,

865 dst->streams[dst_stream]->time_base);

866 if (pkt->duration)

867 local_pkt.duration = av_rescale_q(pkt->duration,

868 src->streams[pkt->stream_index]->time_base,

869 dst->streams[dst_stream]->time_base);

870 return av_write_frame(dst, &local_pkt);

871 }

Generated on Sat Jan 25 2014 19:52:03 for FFmpeg by doxygen 1.8.2