FFmpeg: libavformat/segment.c Source File

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libavformat

segment.c

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1 /*

3 *

4 * This file is part of Libav.

5 *

6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software

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

19 */

21 /**

22 * @file generic segmenter

23 * M3U8 specification can be find here:

24 * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}

25 */

27 /* #define DEBUG */

29 #include <float.h>

31 #include "avformat.h"

32 #include "internal.h"

34 #include "libavutil/avassert.h"

35 #include "libavutil/log.h"

36 #include "libavutil/opt.h"

37 #include "libavutil/avstring.h"

38 #include "libavutil/parseutils.h"

39 #include "libavutil/mathematics.h"

40 #include "libavutil/timestamp.h"

42 typedef struct SegmentListEntry {

43 int index;

44 double start_time, end_time;

45 int64_t start_pts;

46 char filename[1024];

47 struct SegmentListEntry *next;

48 } SegmentListEntry;

50 typedef enum {

51 LIST_TYPE_UNDEFINED = -1,

52 LIST_TYPE_FLAT = 0,

53 LIST_TYPE_CSV,

54 LIST_TYPE_M3U8,

55 LIST_TYPE_EXT, ///< deprecated

56 LIST_TYPE_FFCONCAT,

57 LIST_TYPE_NB,

58 } ListType;

60 #define SEGMENT_LIST_FLAG_CACHE 1

61 #define SEGMENT_LIST_FLAG_LIVE 2

63 typedef struct {

64 const AVClass *class; /**< Class for private options. */

65 int segment_idx; ///< index of the segment file to write, starting from 0

66 int segment_idx_wrap; ///< number after which the index wraps

67 int segment_count; ///< number of segment files already written

68 AVOutputFormat *oformat;

69 AVFormatContext *avf;

70 char *format; ///< format to use for output segment files

71 char *list; ///< filename for the segment list file

72 int list_flags; ///< flags affecting list generation

73 int list_size; ///< number of entries for the segment list file

74 ListType list_type; ///< set the list type

75 AVIOContext *list_pb; ///< list file put-byte context

76 char *time_str; ///< segment duration specification string

77 int64_t time; ///< segment duration

79 char *times_str; ///< segment times specification string

80 int64_t *times; ///< list of segment interval specification

81 int nb_times; ///< number of elments in the times array

83 char *frames_str; ///< segment frame numbers specification string

84 int *frames; ///< list of frame number specification

85 int nb_frames; ///< number of elments in the frames array

86 int frame_count;

88 char *time_delta_str; ///< approximation value duration used for the segment times

89 int64_t time_delta;

90 int individual_header_trailer; /**< Set by a private option. */

91 int write_header_trailer; /**< Set by a private option. */

93 int reset_timestamps; ///< reset timestamps at the begin of each segment

94 char *reference_stream_specifier; ///< reference stream specifier

95 int reference_stream_index;

97 SegmentListEntry cur_entry;

98 SegmentListEntry *segment_list_entries;

99 SegmentListEntry *segment_list_entries_end;

100

101 int is_first_pkt; ///< tells if it is the first packet in the segment

102 } SegmentContext;

103

104 static void print_csv_escaped_str(AVIOContext *ctx, const char *str)

105 {

106 int needs_quoting = !!str[strcspn(str, "\",\n\r")];

107

108 if (needs_quoting)

109 avio_w8(ctx, '"');

110

111 for (; *str; str++) {

112 if (*str == '"')

113 avio_w8(ctx, '"');

114 avio_w8(ctx, *str);

115 }

116 if (needs_quoting)

117 avio_w8(ctx, '"');

118 }

119

120 static int segment_mux_init(AVFormatContext *s)

121 {

122 SegmentContext *seg = s->priv_data;

123 AVFormatContext *oc;

124 int i;

125

126 seg->avf = oc = avformat_alloc_context();

127 if (!oc)

128 return AVERROR(ENOMEM);

129

130 oc->oformat = seg->oformat;

131 oc->interrupt_callback = s->interrupt_callback;

132 av_dict_copy(&oc->metadata, s->metadata, 0);

133

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

135 AVStream *st;

136 AVCodecContext *icodec, *ocodec;

137

138 if (!(st = avformat_new_stream(oc, NULL)))

139 return AVERROR(ENOMEM);

140 icodec = s->streams[i]->codec;

141 ocodec = st->codec;

142 avcodec_copy_context(ocodec, icodec);

143 if (!oc->oformat->codec_tag ||

144 av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == ocodec->codec_id ||

145 av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0) {

146 ocodec->codec_tag = icodec->codec_tag;

147 } else {

148 ocodec->codec_tag = 0;

149 }

150 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;

151 }

152

153 return 0;

154 }

155

156 static int set_segment_filename(AVFormatContext *s)

157 {

158 SegmentContext *seg = s->priv_data;

159 AVFormatContext *oc = seg->avf;

160

161 if (seg->segment_idx_wrap)

162 seg->segment_idx %= seg->segment_idx_wrap;

163 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),

164 s->filename, seg->segment_idx) < 0) {

165 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);

166 return AVERROR(EINVAL);

167 }

168 av_strlcpy(seg->cur_entry.filename, oc->filename, sizeof(seg->cur_entry.filename));

169 return 0;

170 }

171

172 static int segment_start(AVFormatContext *s, int write_header)

173 {

174 SegmentContext *seg = s->priv_data;

175 AVFormatContext *oc = seg->avf;

176 int err = 0;

177

178 if (write_header) {

179 avformat_free_context(oc);

180 seg->avf = NULL;

181 if ((err = segment_mux_init(s)) < 0)

182 return err;

183 oc = seg->avf;

184 }

185

186 seg->segment_idx++;

187 if ((err = set_segment_filename(s)) < 0)

188 return err;

189 seg->segment_count++;

190

191 if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,

192 &s->interrupt_callback, NULL)) < 0)

193 return err;

194

195 if (oc->oformat->priv_class && oc->priv_data)

196 av_opt_set(oc->priv_data, "resend_headers", "1", 0); /* mpegts specific */

197

198 if (write_header) {

199 if ((err = avformat_write_header(oc, NULL)) < 0)

200 return err;

201 }

202

203 seg->is_first_pkt = 1;

204 return 0;

205 }

206

207 static int segment_list_open(AVFormatContext *s)

208 {

209 SegmentContext *seg = s->priv_data;

210 int ret;

211

212 ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,

213 &s->interrupt_callback, NULL);

214 if (ret < 0)

215 return ret;

216

217 if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {

218 SegmentListEntry *entry;

219 double max_duration = 0;

220

221 avio_printf(seg->list_pb, "#EXTM3U\n");

222 avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");

223 avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);

224 avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",

225 seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");

226

227 for (entry = seg->segment_list_entries; entry; entry = entry->next)

228 max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);

229 avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));

230 } else if (seg->list_type == LIST_TYPE_FFCONCAT) {

231 avio_printf(seg->list_pb, "ffconcat version 1.0\n");

232 }

233

234 return ret;

235 }

236

237 static void segment_list_print_entry(AVIOContext *list_ioctx,

238 ListType list_type,

239 const SegmentListEntry *list_entry,

240 void *log_ctx)

241 {

242 switch (list_type) {

243 case LIST_TYPE_FLAT:

244 avio_printf(list_ioctx, "%s\n", list_entry->filename);

245 break;

246 case LIST_TYPE_CSV:

247 case LIST_TYPE_EXT:

248 print_csv_escaped_str(list_ioctx, list_entry->filename);

249 avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);

250 break;

251 case LIST_TYPE_M3U8:

252 avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",

253 list_entry->end_time - list_entry->start_time, list_entry->filename);

254 break;

255 case LIST_TYPE_FFCONCAT:

256 {

257 char *buf;

258 if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {

259 av_log(log_ctx, AV_LOG_WARNING,

260 "Error writing list entry '%s' in list file\n", list_entry->filename);

261 return;

262 }

263 avio_printf(list_ioctx, "file %s\n", buf);

264 av_free(buf);

265 break;

266 }

267 default:

268 av_assert0(!"Invalid list type");

269 }

270 }

271

272 static int segment_end(AVFormatContext *s, int write_trailer, int is_last)

273 {

274 SegmentContext *seg = s->priv_data;

275 AVFormatContext *oc = seg->avf;

276 int ret = 0;

277

278 av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */

279 if (write_trailer)

280 ret = av_write_trailer(oc);

281

282 if (ret < 0)

283 av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",

284 oc->filename);

285

286 if (seg->list) {

287 if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {

288 SegmentListEntry *entry = av_mallocz(sizeof(*entry));

289 if (!entry) {

290 ret = AVERROR(ENOMEM);

291 goto end;

292 }

293

294 /* append new element */

295 memcpy(entry, &seg->cur_entry, sizeof(*entry));

296 if (!seg->segment_list_entries)

297 seg->segment_list_entries = seg->segment_list_entries_end = entry;

298 else

299 seg->segment_list_entries_end->next = entry;

300 seg->segment_list_entries_end = entry;

301

302 /* drop first item */

303 if (seg->list_size && seg->segment_count > seg->list_size) {

304 entry = seg->segment_list_entries;

305 seg->segment_list_entries = seg->segment_list_entries->next;

306 av_freep(&entry);

307 }

308

309 avio_close(seg->list_pb);

310 if ((ret = segment_list_open(s)) < 0)

311 goto end;

312 for (entry = seg->segment_list_entries; entry; entry = entry->next)

313 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);

314 if (seg->list_type == LIST_TYPE_M3U8 && is_last)

315 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");

316 } else {

317 segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);

318 }

319 avio_flush(seg->list_pb);

320 }

321

322 end:

323 avio_close(oc->pb);

324

325 return ret;

326 }

327

328 static int parse_times(void *log_ctx, int64_t **times, int *nb_times,

329 const char *times_str)

330 {

331 char *p;

332 int i, ret = 0;

333 char *times_str1 = av_strdup(times_str);

334 char *saveptr = NULL;

335

336 if (!times_str1)

337 return AVERROR(ENOMEM);

338

339 #define FAIL(err) ret = err; goto end

340

341 *nb_times = 1;

342 for (p = times_str1; *p; p++)

343 if (*p == ',')

344 (*nb_times)++;

345

346 *times = av_malloc(sizeof(**times) * *nb_times);

347 if (!*times) {

348 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");

349 FAIL(AVERROR(ENOMEM));

350 }

351

352 p = times_str1;

353 for (i = 0; i < *nb_times; i++) {

354 int64_t t;

355 char *tstr = av_strtok(p, ",", &saveptr);

356 p = NULL;

357

358 if (!tstr || !tstr[0]) {

359 av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",

360 times_str);

361 FAIL(AVERROR(EINVAL));

362 }

363

364 ret = av_parse_time(&t, tstr, 1);

365 if (ret < 0) {

366 av_log(log_ctx, AV_LOG_ERROR,

367 "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);

368 FAIL(AVERROR(EINVAL));

369 }

370 (*times)[i] = t;

371

372 /* check on monotonicity */

373 if (i && (*times)[i-1] > (*times)[i]) {

374 av_log(log_ctx, AV_LOG_ERROR,

375 "Specified time %f is greater than the following time %f\n",

376 (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);

377 FAIL(AVERROR(EINVAL));

378 }

379 }

380

381 end:

382 av_free(times_str1);

383 return ret;

384 }

385

386 static int parse_frames(void *log_ctx, int **frames, int *nb_frames,

387 const char *frames_str)

388 {

389 char *p;

390 int i, ret = 0;

391 char *frames_str1 = av_strdup(frames_str);

392 char *saveptr = NULL;

393

394 if (!frames_str1)

395 return AVERROR(ENOMEM);

396

397 #define FAIL(err) ret = err; goto end

398

399 *nb_frames = 1;

400 for (p = frames_str1; *p; p++)

401 if (*p == ',')

402 (*nb_frames)++;

403

404 *frames = av_malloc(sizeof(**frames) * *nb_frames);

405 if (!*frames) {

406 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");

407 FAIL(AVERROR(ENOMEM));

408 }

409

410 p = frames_str1;

411 for (i = 0; i < *nb_frames; i++) {

412 long int f;

413 char *tailptr;

414 char *fstr = av_strtok(p, ",", &saveptr);

415

416 p = NULL;

417 if (!fstr) {

418 av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",

419 frames_str);

420 FAIL(AVERROR(EINVAL));

421 }

422 f = strtol(fstr, &tailptr, 10);

423 if (*tailptr || f <= 0 || f >= INT_MAX) {

424 av_log(log_ctx, AV_LOG_ERROR,

425 "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",

426 fstr);

427 FAIL(AVERROR(EINVAL));

428 }

429 (*frames)[i] = f;

430

431 /* check on monotonicity */

432 if (i && (*frames)[i-1] > (*frames)[i]) {

433 av_log(log_ctx, AV_LOG_ERROR,

434 "Specified frame %d is greater than the following frame %d\n",

435 (*frames)[i], (*frames)[i-1]);

436 FAIL(AVERROR(EINVAL));

437 }

438 }

439

440 end:

441 av_free(frames_str1);

442 return ret;

443 }

444

445 static int open_null_ctx(AVIOContext **ctx)

446 {

447 int buf_size = 32768;

448 uint8_t *buf = av_malloc(buf_size);

449 if (!buf)

450 return AVERROR(ENOMEM);

451 *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);

452 if (!*ctx) {

453 av_free(buf);

454 return AVERROR(ENOMEM);

455 }

456 return 0;

457 }

458

459 static void close_null_ctx(AVIOContext *pb)

460 {

461 av_free(pb->buffer);

462 av_free(pb);

463 }

464

465 static int select_reference_stream(AVFormatContext *s)

466 {

467 SegmentContext *seg = s->priv_data;

468 int ret, i;

469

470 seg->reference_stream_index = -1;

471 if (!strcmp(seg->reference_stream_specifier, "auto")) {

472 /* select first index of type with highest priority */

473 int type_index_map[AVMEDIA_TYPE_NB];

474 static const enum AVMediaType type_priority_list[] = {

475 AVMEDIA_TYPE_VIDEO,

476 AVMEDIA_TYPE_AUDIO,

477 AVMEDIA_TYPE_SUBTITLE,

478 AVMEDIA_TYPE_DATA,

479 AVMEDIA_TYPE_ATTACHMENT

480 };

481 enum AVMediaType type;

482

483 for (i = 0; i < AVMEDIA_TYPE_NB; i++)

484 type_index_map[i] = -1;

485

486 /* select first index for each type */

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

488 type = s->streams[i]->codec->codec_type;

489 if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1

490 /* ignore attached pictures/cover art streams */

491 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))

492 type_index_map[type] = i;

493 }

494

495 for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {

496 type = type_priority_list[i];

497 if ((seg->reference_stream_index = type_index_map[type]) >= 0)

498 break;

499 }

500 } else {

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

502 ret = avformat_match_stream_specifier(s, s->streams[i],

503 seg->reference_stream_specifier);

504 if (ret < 0)

505 return ret;

506 if (ret > 0) {

507 seg->reference_stream_index = i;

508 break;

509 }

510 }

511 }

512

513 if (seg->reference_stream_index < 0) {

514 av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",

515 seg->reference_stream_specifier);

516 return AVERROR(EINVAL);

517 }

518

519 return 0;

520 }

521

522 static int seg_write_header(AVFormatContext *s)

523 {

524 SegmentContext *seg = s->priv_data;

525 AVFormatContext *oc = NULL;

526 int ret;

527

528 seg->segment_count = 0;

529 if (!seg->write_header_trailer)

530 seg->individual_header_trailer = 0;

531

532 if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {

533 av_log(s, AV_LOG_ERROR,

534 "segment_time, segment_times, and segment_frames options "

535 "are mutually exclusive, select just one of them\n");

536 return AVERROR(EINVAL);

537 }

538

539 if (seg->times_str) {

540 if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)

541 return ret;

542 } else if (seg->frames_str) {

543 if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)

544 return ret;

545 } else {

546 /* set default value if not specified */

547 if (!seg->time_str)

548 seg->time_str = av_strdup("2");

549 if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {

550 av_log(s, AV_LOG_ERROR,

551 "Invalid time duration specification '%s' for segment_time option\n",

552 seg->time_str);

553 return ret;

554 }

555 }

556

557 if (seg->time_delta_str) {

558 if ((ret = av_parse_time(&seg->time_delta, seg->time_delta_str, 1)) < 0) {

559 av_log(s, AV_LOG_ERROR,

560 "Invalid time duration specification '%s' for delta option\n",

561 seg->time_delta_str);

562 return ret;

563 }

564 }

565

566 if (seg->list) {

567 if (seg->list_type == LIST_TYPE_UNDEFINED) {

568 if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;

569 else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;

570 else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;

571 else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;

572 else seg->list_type = LIST_TYPE_FLAT;

573 }

574 if ((ret = segment_list_open(s)) < 0)

575 goto fail;

576 }

577 if (seg->list_type == LIST_TYPE_EXT)

578 av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");

579

580 if ((ret = select_reference_stream(s)) < 0)

581 goto fail;

582 av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",

583 seg->reference_stream_index,

584 av_get_media_type_string(s->streams[seg->reference_stream_index]->codec->codec_type));

585

586 seg->oformat = av_guess_format(seg->format, s->filename, NULL);

587

588 if (!seg->oformat) {

589 ret = AVERROR_MUXER_NOT_FOUND;

590 goto fail;

591 }

592 if (seg->oformat->flags & AVFMT_NOFILE) {

593 av_log(s, AV_LOG_ERROR, "format %s not supported.\n",

594 seg->oformat->name);

595 ret = AVERROR(EINVAL);

596 goto fail;

597 }

598

599 if ((ret = segment_mux_init(s)) < 0)

600 goto fail;

601 oc = seg->avf;

602

603 if ((ret = set_segment_filename(s)) < 0)

604 goto fail;

605 seg->segment_count++;

606

607 if (seg->write_header_trailer) {

608 if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,

609 &s->interrupt_callback, NULL)) < 0)

610 goto fail;

611 } else {

612 if ((ret = open_null_ctx(&oc->pb)) < 0)

613 goto fail;

614 }

615

616 if ((ret = avformat_write_header(oc, NULL)) < 0) {

617 avio_close(oc->pb);

618 goto fail;

619 }

620 seg->is_first_pkt = 1;

621

622 if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)

623 s->avoid_negative_ts = 1;

624

625 if (!seg->write_header_trailer) {

626 close_null_ctx(oc->pb);

627 if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,

628 &s->interrupt_callback, NULL)) < 0)

629 goto fail;

630 }

631

632 fail:

633 if (ret) {

634 if (seg->list)

635 avio_close(seg->list_pb);

636 if (seg->avf)

637 avformat_free_context(seg->avf);

638 }

639 return ret;

640 }

641

642 static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)

643 {

644 SegmentContext *seg = s->priv_data;

645 AVFormatContext *oc = seg->avf;

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

647 int64_t end_pts = INT64_MAX;

648 int start_frame = INT_MAX;

649 int ret;

650

651 if (seg->times) {

652 end_pts = seg->segment_count <= seg->nb_times ?

653 seg->times[seg->segment_count-1] : INT64_MAX;

654 } else if (seg->frames) {

655 start_frame = seg->segment_count <= seg->nb_frames ?

656 seg->frames[seg->segment_count-1] : INT_MAX;

657 } else {

658 end_pts = seg->time * seg->segment_count;

659 }

660

661 av_dlog(s, "packet stream:%d pts:%s pts_time:%s is_key:%d frame:%d\n",

662 pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),

663 pkt->flags & AV_PKT_FLAG_KEY,

664 pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);

665

666 if (pkt->stream_index == seg->reference_stream_index &&

667 pkt->flags & AV_PKT_FLAG_KEY &&

668 (seg->frame_count >= start_frame ||

669 (pkt->pts != AV_NOPTS_VALUE &&

670 av_compare_ts(pkt->pts, st->time_base,

671 end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0))) {

672 ret = segment_end(s, seg->individual_header_trailer, 0);

673

674 if (!ret)

675 ret = segment_start(s, seg->individual_header_trailer);

676

677 if (ret)

678 goto fail;

679

680 oc = seg->avf;

681

682 seg->cur_entry.index = seg->segment_idx;

683 seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);

684 seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);

685 } else if (pkt->pts != AV_NOPTS_VALUE) {

686 seg->cur_entry.end_time =

687 FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));

688 }

689

690 if (seg->is_first_pkt) {

691 av_log(s, AV_LOG_DEBUG, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",

692 seg->avf->filename, pkt->stream_index,

693 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);

694 seg->is_first_pkt = 0;

695 }

696

697 if (seg->reset_timestamps) {

698 av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",

699 pkt->stream_index,

700 av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),

701 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),

702 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));

703

704 /* compute new timestamps */

705 if (pkt->pts != AV_NOPTS_VALUE)

706 pkt->pts -= av_rescale_q(seg->cur_entry.start_pts, AV_TIME_BASE_Q, st->time_base);

707 if (pkt->dts != AV_NOPTS_VALUE)

708 pkt->dts -= av_rescale_q(seg->cur_entry.start_pts, AV_TIME_BASE_Q, st->time_base);

709

710 av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",

711 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),

712 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));

713 }

714

715 ret = ff_write_chained(oc, pkt->stream_index, pkt, s);

716

717 fail:

718 if (pkt->stream_index == seg->reference_stream_index)

719 seg->frame_count++;

720

721 if (ret < 0) {

722 if (seg->list)

723 avio_close(seg->list_pb);

724 avformat_free_context(oc);

725 }

726

727 return ret;

728 }

729

730 static int seg_write_trailer(struct AVFormatContext *s)

731 {

732 SegmentContext *seg = s->priv_data;

733 AVFormatContext *oc = seg->avf;

734 SegmentListEntry *cur, *next;

735

736 int ret;

737 if (!seg->write_header_trailer) {

738 if ((ret = segment_end(s, 0, 1)) < 0)

739 goto fail;

740 open_null_ctx(&oc->pb);

741 ret = av_write_trailer(oc);

742 close_null_ctx(oc->pb);

743 } else {

744 ret = segment_end(s, 1, 1);

745 }

746 fail:

747 if (seg->list)

748 avio_close(seg->list_pb);

749

750 av_opt_free(seg);

751 av_freep(&seg->times);

752 av_freep(&seg->frames);

753

754 cur = seg->segment_list_entries;

755 while (cur) {

756 next = cur->next;

757 av_free(cur);

758 cur = next;

759 }

760

761 avformat_free_context(oc);

762 return ret;

763 }

764

765 #define OFFSET(x) offsetof(SegmentContext, x)

766 #define E AV_OPT_FLAG_ENCODING_PARAM

767 static const AVOption options[] = {

768 { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },

769 { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },

770 { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },

771

772 { "segment_list_flags","set flags affecting segment list generation", OFFSET(list_flags), AV_OPT_TYPE_FLAGS, {.i64 = SEGMENT_LIST_FLAG_CACHE }, 0, UINT_MAX, E, "list_flags"},

773 { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},

774 { "live", "enable live-friendly list generation (useful for HLS)", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_LIVE }, INT_MIN, INT_MAX, E, "list_flags"},

775

776 { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },

777

778 { "segment_list_type", "set the segment list type", OFFSET(list_type), AV_OPT_TYPE_INT, {.i64 = LIST_TYPE_UNDEFINED}, -1, LIST_TYPE_NB-1, E, "list_type" },

779 { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },

780 { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },

781 { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },

782 { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },

783 { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },

784 { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },

785

786 { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },

787 { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta_str), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, E },

788 { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },

789 { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },

790 { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },

791 { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },

792

793 { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },

794 { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },

795 { "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },

796 { NULL },

797 };

798

799 static const AVClass seg_class = {

800 .class_name = "segment muxer",

801 .item_name = av_default_item_name,

802 .option = options,

803 .version = LIBAVUTIL_VERSION_INT,

804 };

805

806 AVOutputFormat ff_segment_muxer = {