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 /**

48 * @file

49 * muxing functions for use within libavformat

50 */

52 /* fraction handling */

54 /**

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

56 *

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

58 *

59 * @param f fractional number

60 * @param val integer value

61 * @param num must be >= 0

62 * @param den must be >= 1

63 */

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

65 {

66 num += (den >> 1);

67 if (num >= den) {

68 val += num / den;

69 num = num % den;

70 }

71 f->val = val;

72 f->num = num;

73 f->den = den;

74 }

76 /**

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

78 *

79 * @param f fractional number

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

81 */

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

83 {

84 int64_t num, den;

86 num = f->num + incr;

87 den = f->den;

88 if (num < 0) {

89 f->val += num / den;

90 num = num % den;

91 if (num < 0) {

92 num += den;

93 f->val--;

94 }

95 } else if (num >= den) {

96 f->val += num / den;

97 num = num % den;

98 }

99 f->num = num;

100 }

101

102 AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision)

103 {

104 AVRational q;

105 int j;

106

107 q = st->time_base;

108

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

110 while (q.den / q.num < min_precision && q.num % j == 0)

111 q.num /= j;

112 while (q.den / q.num < min_precision && q.den < (1<<24))

113 q.den <<= 1;

114

115 return q;

116 }

117

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

119 const char *format, const char *filename)

120 {

121 AVFormatContext *s = avformat_alloc_context();

122 int ret = 0;

123

124 *avctx = NULL;

125 if (!s)

126 goto nomem;

127

128 if (!oformat) {

129 if (format) {

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

131 if (!oformat) {

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

133 ret = AVERROR(EINVAL);

134 goto error;

135 }

136 } else {

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

138 if (!oformat) {

139 ret = AVERROR(EINVAL);

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

141 filename);

142 goto error;

143 }

144 }

145 }

146

147 s->oformat = oformat;

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

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

150 if (!s->priv_data)

151 goto nomem;

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

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

154 av_opt_set_defaults(s->priv_data);

155 }

156 } else

157 s->priv_data = NULL;

158

159 if (filename)

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

161 *avctx = s;

162 return 0;

163 nomem:

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

165 ret = AVERROR(ENOMEM);

166 error:

167 avformat_free_context(s);

168 return ret;

169 }

170

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

172 {

173 const AVCodecTag *avctag;

174 int n;

175 enum AVCodecID id = AV_CODEC_ID_NONE;

176 int64_t tag = -1;

177

178 /**

179 * Check that tag + id is in the table

180 * If neither is in the table -> OK

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

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

183 */

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

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

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

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

188 id = avctag->id;

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

190 return 1;

191 }

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

193 tag = avctag->tag;

194 avctag++;

195 }

196 }

197 if (id != AV_CODEC_ID_NONE)

198 return 0;

199 if (tag >= 0 && (s->strict_std_compliance >= FF_COMPLIANCE_NORMAL))

200 return 0;

201 return 1;

202 }

203

204

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

206 {

207 int ret = 0, i;

208 AVStream *st;

209 AVDictionary *tmp = NULL;

210 AVCodecContext *codec = NULL;

211 AVOutputFormat *of = s->oformat;

212 AVDictionaryEntry *e;

213

214 if (options)

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

216

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

218 goto fail;

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

220 (ret = av_opt_set_dict2(s->priv_data, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)

221 goto fail;

222

223 #if FF_API_LAVF_BITEXACT

224 if (s->nb_streams && s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)

225 s->flags |= AVFMT_FLAG_BITEXACT;

226 #endif

227

228 // some sanity checks

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

230 av_log(s, AV_LOG_ERROR, "No streams to mux were specified\n");

231 ret = AVERROR(EINVAL);

232 goto fail;

233 }

234

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

236 st = s->streams[i];

237 codec = st->codec;

238

239 #if FF_API_LAVF_CODEC_TB

240 FF_DISABLE_DEPRECATION_WARNINGS

241 if (!st->time_base.num && codec->time_base.num) {

242 av_log(s, AV_LOG_WARNING, "Using AVStream.codec.time_base as a "

243 "timebase hint to the muxer is deprecated. Set "

244 "AVStream.time_base instead.\n");

245 avpriv_set_pts_info(st, 64, codec->time_base.num, codec->time_base.den);

246 }

247 FF_ENABLE_DEPRECATION_WARNINGS

248 #endif

249

250 if (!st->time_base.num) {

251 /* fall back on the default timebase values */

252 if (codec->codec_type == AVMEDIA_TYPE_AUDIO && codec->sample_rate)

253 avpriv_set_pts_info(st, 64, 1, codec->sample_rate);

254 else

255 avpriv_set_pts_info(st, 33, 1, 90000);

256 }

257

258 switch (codec->codec_type) {

259 case AVMEDIA_TYPE_AUDIO:

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

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

262 ret = AVERROR(EINVAL);

263 goto fail;

264 }

265 if (!codec->block_align)

266 codec->block_align = codec->channels *

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

268 break;

269 case AVMEDIA_TYPE_VIDEO:

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

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

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

273 ret = AVERROR(EINVAL);

274 goto fail;

275 }

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

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

278 ) {

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

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

281 codec->sample_aspect_ratio.num != 0 &&

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

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

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

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

286 codec->sample_aspect_ratio.num,

287 codec->sample_aspect_ratio.den);

288 ret = AVERROR(EINVAL);

289 goto fail;

290 }

291 }

292 break;

293 }

294

295 if (of->codec_tag) {

296 if ( codec->codec_tag

297 && codec->codec_id == AV_CODEC_ID_RAWVIDEO

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

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

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

301 // the current rawvideo encoding system ends up setting

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

303 codec->codec_tag = 0;

304 }

305 if (codec->codec_tag) {

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

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

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

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

310 av_log(s, AV_LOG_ERROR,

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

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

313 ret = AVERROR_INVALIDDATA;

314 goto fail;

315 }

316 } else

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

318 }

319

320 if (of->flags & AVFMT_GLOBALHEADER &&

321 !(codec->flags & CODEC_FLAG_GLOBAL_HEADER))

322 av_log(s, AV_LOG_WARNING,

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

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

325

326 if (codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)

327 s->internal->nb_interleaved_streams++;

328 }

329

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

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

332 if (!s->priv_data) {

333 ret = AVERROR(ENOMEM);

334 goto fail;

335 }

336 if (of->priv_class) {

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

338 av_opt_set_defaults(s->priv_data);

339 if ((ret = av_opt_set_dict2(s->priv_data, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)

340 goto fail;

341 }

342 }

343

344 /* set muxer identification string */

345 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {

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

347 } else {

348 av_dict_set(&s->metadata, "encoder", NULL, 0);

349 }

350

351 for (e = NULL; e = av_dict_get(s->metadata, "encoder-", e, AV_DICT_IGNORE_SUFFIX); ) {

352 av_dict_set(&s->metadata, e->key, NULL, 0);

353 }

354

355 if (options) {

356 av_dict_free(options);

357 *options = tmp;

358 }

359

360 return 0;

361

362 fail:

363 av_dict_free(&tmp);

364 return ret;

365 }

366

367 static int init_pts(AVFormatContext *s)

368 {

369 int i;

370 AVStream *st;

371

372 /* init PTS generation */

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

374 int64_t den = AV_NOPTS_VALUE;

375 st = s->streams[i];

376

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

378 case AVMEDIA_TYPE_AUDIO:

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

380 break;

381 case AVMEDIA_TYPE_VIDEO:

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

383 break;

384 default:

385 break;

386 }

387 if (den != AV_NOPTS_VALUE) {

388 if (den <= 0)

389 return AVERROR_INVALIDDATA;

390

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

392 }

393 }

394

395 return 0;

396 }

397

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

399 {

400 int ret = 0;

401

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

403 return ret;

404

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

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

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

408 ret = s->pb->error;

409 if (ret < 0)

410 return ret;

411 if (s->flush_packets && s->pb && s->pb->error >= 0 && s->flags & AVFMT_FLAG_FLUSH_PACKETS)

412 avio_flush(s->pb);

413 }

414

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

416 return ret;

417

418 if (s->avoid_negative_ts < 0) {

419 av_assert2(s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_AUTO);

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

421 s->avoid_negative_ts = 0;

422 } else

423 s->avoid_negative_ts = AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE;

424 }

425

426 return 0;

427 }

428

429 #define AV_PKT_FLAG_UNCODED_FRAME 0x2000

430

431 /* Note: using sizeof(AVFrame) from outside lavu is unsafe in general, but

432 it is only being used internally to this file as a consistency check.

433 The value is chosen to be very unlikely to appear on its own and to cause

434 immediate failure if used anywhere as a real size. */

435 #define UNCODED_FRAME_PACKET_SIZE (INT_MIN / 3 * 2 + (int)sizeof(AVFrame))

436

437

438 //FIXME merge with compute_pkt_fields

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

440 {

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

442 int num, den, i;

443 int frame_size;

444

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

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

447

448 if (pkt->duration < 0 && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {

449 av_log(s, AV_LOG_WARNING, "Packet with invalid duration %d in stream %d\n",

450 pkt->duration, pkt->stream_index);

451 pkt->duration = 0;

452 }

453

454 /* duration field */

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

456 ff_compute_frame_duration(s, &num, &den, st, NULL, pkt);

457 if (den && num) {

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

459 }

460 }

461

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

463 pkt->pts = pkt->dts;

464

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

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

467 static int warned;

468 if (!warned) {

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

470 warned = 1;

471 }

472 pkt->dts =

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

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

475 }

476

477 //calculate dts from pts

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

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

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

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

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

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

484

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

486 }

487

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

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

490 st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE &&

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

492 av_log(s, AV_LOG_ERROR,

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

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

495 return AVERROR(EINVAL);

496 }

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

498 av_log(s, AV_LOG_ERROR,

499 "pts (%s) < dts (%s) in stream %d\n",

500 av_ts2str(pkt->pts), av_ts2str(pkt->dts),

501 st->index);

502 return AVERROR(EINVAL);

503 }

504

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

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

507 st->cur_dts = pkt->dts;

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

509

510 /* update pts */

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

512 case AVMEDIA_TYPE_AUDIO:

513 frame_size = (pkt->flags & AV_PKT_FLAG_UNCODED_FRAME) ?

514 ((AVFrame *)pkt->data)->nb_samples :

515 av_get_audio_frame_duration(st->codec, pkt->size);

516

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

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

519 * had the real timestamps from the encoder */

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

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

522 }

523 break;

524 case AVMEDIA_TYPE_VIDEO:

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

526 break;

527 }

528 return 0;

529 }

530

531 /**

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

533 * sidedata.

534 *

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

536 * AVFMT_NOTIMESTAMPS is set.

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

538 * are set in the callers.

539 */

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

541 {

542 int ret, did_split;

543

544 if (s->output_ts_offset) {

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

546 int64_t offset = av_rescale_q(s->output_ts_offset, AV_TIME_BASE_Q, st->time_base);

547

548 if (pkt->dts != AV_NOPTS_VALUE)

549 pkt->dts += offset;

550 if (pkt->pts != AV_NOPTS_VALUE)

551 pkt->pts += offset;

552 }

553

554 if (s->avoid_negative_ts > 0) {

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

556 int64_t offset = st->mux_ts_offset;

557

558 if (s->internal->offset == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE &&

559 (pkt->dts < 0 || s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO)) {

560 s->internal->offset = -pkt->dts;

561 s->internal->offset_timebase = st->time_base;

562 }

563

564 if (s->internal->offset != AV_NOPTS_VALUE && !offset) {

565 offset = st->mux_ts_offset =

566 av_rescale_q_rnd(s->internal->offset,

567 s->internal->offset_timebase,

568 st->time_base,

569 AV_ROUND_UP);

570 }

571

572 if (pkt->dts != AV_NOPTS_VALUE)

573 pkt->dts += offset;

574 if (pkt->pts != AV_NOPTS_VALUE)

575 pkt->pts += offset;

576

577 av_assert2(pkt->dts == AV_NOPTS_VALUE || pkt->dts >= 0 || s->max_interleave_delta > 0);

578 if (pkt->dts != AV_NOPTS_VALUE && pkt->dts < 0) {

579 av_log(s, AV_LOG_WARNING,

580 "Packets poorly interleaved, failed to avoid negative "

581 "timestamp %s in stream %d.\n"

582 "Try -max_interleave_delta 0 as a possible workaround.\n",

583 av_ts2str(pkt->dts),

584 pkt->stream_index

585 );

586 }

587 }

588

589 did_split = av_packet_split_side_data(pkt);

590 if ((pkt->flags & AV_PKT_FLAG_UNCODED_FRAME)) {

591 AVFrame *frame = (AVFrame *)pkt->data;

592 av_assert0(pkt->size == UNCODED_FRAME_PACKET_SIZE);

593 ret = s->oformat->write_uncoded_frame(s, pkt->stream_index, &frame, 0);

594 av_frame_free(&frame);

595 } else {

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

597 }

598

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

600 avio_flush(s->pb);

601

602 if (did_split)

603 av_packet_merge_side_data(pkt);

604

605 return ret;

606 }

607

608 static int check_packet(AVFormatContext *s, AVPacket *pkt)

609 {

610 if (!pkt)

611 return 0;

612

613 if (pkt->stream_index < 0 || pkt->stream_index >= s->nb_streams) {

614 av_log(s, AV_LOG_ERROR, "Invalid packet stream index: %d\n",

615 pkt->stream_index);

616 return AVERROR(EINVAL);

617 }

618

619 if (s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {

620 av_log(s, AV_LOG_ERROR, "Received a packet for an attachment stream.\n");

621 return AVERROR(EINVAL);

622 }

623

624 return 0;

625 }

626

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

628 {

629 int ret;

630

631 ret = check_packet(s, pkt);

632 if (ret < 0)

633 return ret;

634

635 if (!pkt) {

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

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

638 if (s->flush_packets && s->pb && s->pb->error >= 0 && s->flags & AVFMT_FLAG_FLUSH_PACKETS)

639 avio_flush(s->pb);

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

641 ret = s->pb->error;

642 return ret;

643 }

644 return 1;

645 }

646

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

648

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

650 return ret;

651

652 ret = write_packet(s, pkt);

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

654 ret = s->pb->error;

655

656 if (ret >= 0)

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

658 return ret;

659 }

660

661 #define CHUNK_START 0x1000

662

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

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

665 {

666 int ret;

667 AVPacketList **next_point, *this_pktl;

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

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

670

671 this_pktl = av_mallocz(sizeof(AVPacketList));

672 if (!this_pktl)

673 return AVERROR(ENOMEM);

674 this_pktl->pkt = *pkt;

675 #if FF_API_DESTRUCT_PACKET

676 FF_DISABLE_DEPRECATION_WARNINGS

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

678 FF_ENABLE_DEPRECATION_WARNINGS

679 #endif

680 pkt->buf = NULL;

681 pkt->side_data = NULL;

682 pkt->side_data_elems = 0;

683 if ((pkt->flags & AV_PKT_FLAG_UNCODED_FRAME)) {

684 av_assert0(pkt->size == UNCODED_FRAME_PACKET_SIZE);

685 av_assert0(((AVFrame *)pkt->data)->buf);

686 } else {

687 // Duplicate the packet if it uses non-allocated memory

688 if ((ret = av_dup_packet(&this_pktl->pkt)) < 0) {

689 av_free(this_pktl);

690 return ret;

691 }

692 }

693

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

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

696 } else {

697 next_point = &s->internal->packet_buffer;

698 }

699

700 if (chunked) {

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

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

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

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

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

706 st->interleaver_chunk_size = 0;

707 this_pktl->pkt.flags |= CHUNK_START;

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

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

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

711

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

713 } else

714 st->interleaver_chunk_duration = 0;

715 }

716 }

717 if (*next_point) {

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

719 goto next_non_null;

720

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

722 while ( *next_point

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

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

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

726 if (*next_point)

727 goto next_non_null;

728 } else {

729 next_point = &(s->internal->packet_buffer_end->next);

730 }

731 }

732 av_assert1(!*next_point);

733

734 s->internal->packet_buffer_end = this_pktl;

735 next_non_null:

736

737 this_pktl->next = *next_point;

738

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

740 *next_point = this_pktl;

741

742 return 0;

743 }

744

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

746 AVPacket *pkt)

747 {

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

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

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

751 st->time_base);

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

753 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);

754 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);

755 if (ts == ts2) {

756 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

757 -( 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;

758 ts2=0;

759 }

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

761 }

762

763 if (comp == 0)

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

765 return comp > 0;

766 }

767

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

769 AVPacket *pkt, int flush)

770 {

771 AVPacketList *pktl;

772 int stream_count = 0;

773 int noninterleaved_count = 0;

774 int i, ret;

775

776 if (pkt) {

777 if ((ret = ff_interleave_add_packet(s, pkt, interleave_compare_dts)) < 0)

778 return ret;

779 }

780

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

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

783 ++stream_count;

784 } else if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT &&

785 s->streams[i]->codec->codec_id != AV_CODEC_ID_VP8 &&

786 s->streams[i]->codec->codec_id != AV_CODEC_ID_VP9) {

787 ++noninterleaved_count;

788 }

789 }

790

791 if (s->internal->nb_interleaved_streams == stream_count)

792 flush = 1;

793

794 if (s->max_interleave_delta > 0 &&

795 s->internal->packet_buffer &&

796 !flush &&

797 s->internal->nb_interleaved_streams == stream_count+noninterleaved_count

798 ) {

799 AVPacket *top_pkt = &s->internal->packet_buffer->pkt;

800 int64_t delta_dts = INT64_MIN;

801 int64_t top_dts = av_rescale_q(top_pkt->dts,

802 s->streams[top_pkt->stream_index]->time_base,

803 AV_TIME_BASE_Q);

804

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

806 int64_t last_dts;

807 const AVPacketList *last = s->streams[i]->last_in_packet_buffer;

808

809 if (!last)

810 continue;

811

812 last_dts = av_rescale_q(last->pkt.dts,

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

814 AV_TIME_BASE_Q);

815 delta_dts = FFMAX(delta_dts, last_dts - top_dts);

816 }

817

818 if (delta_dts > s->max_interleave_delta) {

819 av_log(s, AV_LOG_DEBUG,

820 "Delay between the first packet and last packet in the "

821 "muxing queue is %"PRId64" > %"PRId64": forcing output\n",

822 delta_dts, s->max_interleave_delta);

823 flush = 1;

824 }

825 }

826

827 if (stream_count && flush) {

828 AVStream *st;

829 pktl = s->internal->packet_buffer;

830 *out = pktl->pkt;

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

832

833 s->internal->packet_buffer = pktl->next;

834 if (!s->internal->packet_buffer)

835 s->internal->packet_buffer_end = NULL;

836

837 if (st->last_in_packet_buffer == pktl)

838 st->last_in_packet_buffer = NULL;

839 av_freep(&pktl);

840

841 return 1;

842 } else {

843 av_init_packet(out);

844 return 0;

845 }

846 }

847

848 /**

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

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

851 * @param in the input packet

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

853 * remaining packets should be output

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

855 * < 0 if an error occurred

856 */

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

858 {

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

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

861 if (in)

862 av_free_packet(in);

863 return ret;

864 } else

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

866 }

867

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

869 {

870 int ret, flush = 0;

871

872 ret = check_packet(s, pkt);

873 if (ret < 0)

874 goto fail;

875

876 if (pkt) {

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

878

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

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

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

882 goto fail;

883

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

885 ret = AVERROR(EINVAL);

886 goto fail;

887 }

888 } else {

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

890 flush = 1;

891 }

892

893 for (;; ) {

894 AVPacket opkt;

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

896 if (pkt) {

897 memset(pkt, 0, sizeof(*pkt));

898 av_init_packet(pkt);

899 pkt = NULL;

900 }

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

902 return ret;

903

904 ret = write_packet(s, &opkt);

905 if (ret >= 0)

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

907

908 av_free_packet(&opkt);

909

910 if (ret < 0)

911 return ret;

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

913 return s->pb->error;

914 }

915 fail:

916 av_packet_unref(pkt);

917 return ret;

918 }

919

920 int av_write_trailer(AVFormatContext *s)

921 {

922 int ret, i;

923

924 for (;; ) {

925 AVPacket pkt;

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

927 if (ret < 0)

928 goto fail;

929 if (!ret)

930 break;

931

932 ret = write_packet(s, &pkt);

933 if (ret >= 0)

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

935

936 av_free_packet(&pkt);

937

938 if (ret < 0)

939 goto fail;

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

941 goto fail;

942 }

943

944 fail:

945 if (s->oformat->write_trailer)

946 if (ret >= 0) {

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

948 } else {

949 s->oformat->write_trailer(s);

950 }

951

952 if (s->pb)

953 avio_flush(s->pb);

954 if (ret == 0)

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

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

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

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

959 }

960 if (s->oformat->priv_class)

961 av_opt_free(s->priv_data);

962 av_freep(&s->priv_data);

963 return ret;

964 }

965

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

967 int64_t *dts, int64_t *wall)

968 {

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

970 return AVERROR(ENOSYS);

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

972 return 0;

973 }

974

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

976 AVFormatContext *src, int interleave)

977 {

978 AVPacket local_pkt;

979 int ret;

980

981 local_pkt = *pkt;

982 local_pkt.stream_index = dst_stream;

983 if (pkt->pts != AV_NOPTS_VALUE)

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

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

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

987 if (pkt->dts != AV_NOPTS_VALUE)

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

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

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

991 if (pkt->duration)

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

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

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

995

996 if (interleave) ret = av_interleaved_write_frame(dst, &local_pkt);

997 else ret = av_write_frame(dst, &local_pkt);

998 pkt->buf = local_pkt.buf;

999 pkt->destruct = local_pkt.destruct;

1000 return ret;

1001 }

1002

1003 static int av_write_uncoded_frame_internal(AVFormatContext *s, int stream_index,

1004 AVFrame *frame, int interleaved)

1005 {

1006 AVPacket pkt, *pktp;

1007

1008 av_assert0(s->oformat);

1009 if (!s->oformat->write_uncoded_frame)

1010 return AVERROR(ENOSYS);

1011

1012 if (!frame) {

1013 pktp = NULL;

1014 } else {

1015 pktp = &pkt;

1016 av_init_packet(&pkt);

1017 pkt.data = (void *)frame;

1018 pkt.size = UNCODED_FRAME_PACKET_SIZE;

1019 pkt.pts =

1020 pkt.dts = frame->pts;

1021 pkt.duration = av_frame_get_pkt_duration(frame);

1022 pkt.stream_index = stream_index;

1023 pkt.flags |= AV_PKT_FLAG_UNCODED_FRAME;

1024 }

1025

1026 return interleaved ? av_interleaved_write_frame(s, pktp) :

1027 av_write_frame(s, pktp);

1028 }

1029

1030 int av_write_uncoded_frame(AVFormatContext *s, int stream_index,

1031 AVFrame *frame)

1032 {

1033 return av_write_uncoded_frame_internal(s, stream_index, frame, 0);

1034 }

1035

1036 int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index,

1037 AVFrame *frame)

1038 {

1039 return av_write_uncoded_frame_internal(s, stream_index, frame, 1);

1040 }

1041

1042 int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index)

1043 {

1044 av_assert0(s->oformat);

1045 if (!s->oformat->write_uncoded_frame)

1046 return AVERROR(ENOSYS);

1047 return s->oformat->write_uncoded_frame(s, stream_index, NULL,

1048 AV_WRITE_UNCODED_FRAME_QUERY);

1049 }

Generated on Sun Mar 8 2015 02:35:11 for FFmpeg by doxygen 1.8.2