1/* 2 * Copyright (c) 2011, Luca Barbato 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 */ 20 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 */ 26 27/* #define DEBUG */ 28 29#include <float.h> 30#include <time.h> 31 32#include "avformat.h" 33#include "internal.h" 34 35#include "libavutil/avassert.h" 36#include "libavutil/log.h" 37#include "libavutil/opt.h" 38#include "libavutil/avstring.h" 39#include "libavutil/parseutils.h" 40#include "libavutil/mathematics.h" 41#include "libavutil/time.h" 42#include "libavutil/timestamp.h" 43 44typedef struct SegmentListEntry { 45 int index; 46 double start_time, end_time; 47 int64_t start_pts; 48 int64_t offset_pts; 49 char *filename; 50 struct SegmentListEntry *next; 51} SegmentListEntry; 52 53typedef enum { 54 LIST_TYPE_UNDEFINED = -1, 55 LIST_TYPE_FLAT = 0, 56 LIST_TYPE_CSV, 57 LIST_TYPE_M3U8, 58 LIST_TYPE_EXT, ///< deprecated 59 LIST_TYPE_FFCONCAT, 60 LIST_TYPE_NB, 61} ListType; 62 63#define SEGMENT_LIST_FLAG_CACHE 1 64#define SEGMENT_LIST_FLAG_LIVE 2 65 66typedef struct { 67 const AVClass *class; /**< Class for private options. */ 68 int segment_idx; ///< index of the segment file to write, starting from 0 69 int segment_idx_wrap; ///< number after which the index wraps 70 int segment_idx_wrap_nb; ///< number of time the index has wraped 71 int segment_count; ///< number of segment files already written 72 AVOutputFormat *oformat; 73 AVFormatContext *avf; 74 char *format; ///< format to use for output segment files 75 char *list; ///< filename for the segment list file 76 int list_flags; ///< flags affecting list generation 77 int list_size; ///< number of entries for the segment list file 78 79 int use_clocktime; ///< flag to cut segments at regular clock time 80 int64_t last_val; ///< remember last time for wrap around detection 81 int64_t last_cut; ///< remember last cut 82 int cut_pending; 83 84 char *entry_prefix; ///< prefix to add to list entry filenames 85 ListType list_type; ///< set the list type 86 AVIOContext *list_pb; ///< list file put-byte context 87 char *time_str; ///< segment duration specification string 88 int64_t time; ///< segment duration 89 90 char *times_str; ///< segment times specification string 91 int64_t *times; ///< list of segment interval specification 92 int nb_times; ///< number of elments in the times array 93 94 char *frames_str; ///< segment frame numbers specification string 95 int *frames; ///< list of frame number specification 96 int nb_frames; ///< number of elments in the frames array 97 int frame_count; 98 99 int64_t time_delta; 100 int individual_header_trailer; /**< Set by a private option. */ 101 int write_header_trailer; /**< Set by a private option. */ 102 103 int reset_timestamps; ///< reset timestamps at the begin of each segment 104 int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds 105 char *reference_stream_specifier; ///< reference stream specifier 106 int reference_stream_index; 107 108 SegmentListEntry cur_entry; 109 SegmentListEntry *segment_list_entries; 110 SegmentListEntry *segment_list_entries_end; 111 112 int is_first_pkt; ///< tells if it is the first packet in the segment 113} SegmentContext; 114 115static void print_csv_escaped_str(AVIOContext *ctx, const char *str) 116{ 117 int needs_quoting = !!str[strcspn(str, "\",\n\r")]; 118 119 if (needs_quoting) 120 avio_w8(ctx, '"'); 121 122 for (; *str; str++) { 123 if (*str == '"') 124 avio_w8(ctx, '"'); 125 avio_w8(ctx, *str); 126 } 127 if (needs_quoting) 128 avio_w8(ctx, '"'); 129} 130 131static int segment_mux_init(AVFormatContext *s) 132{ 133 SegmentContext *seg = s->priv_data; 134 AVFormatContext *oc; 135 int i; 136 137 seg->avf = oc = avformat_alloc_context(); 138 if (!oc) 139 return AVERROR(ENOMEM); 140 141 oc->oformat = seg->oformat; 142 oc->interrupt_callback = s->interrupt_callback; 143 av_dict_copy(&oc->metadata, s->metadata, 0); 144 145 for (i = 0; i < s->nb_streams; i++) { 146 AVStream *st; 147 AVCodecContext *icodec, *ocodec; 148 149 if (!(st = avformat_new_stream(oc, NULL))) 150 return AVERROR(ENOMEM); 151 icodec = s->streams[i]->codec; 152 ocodec = st->codec; 153 avcodec_copy_context(ocodec, icodec); 154 if (!oc->oformat->codec_tag || 155 av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == ocodec->codec_id || 156 av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0) { 157 ocodec->codec_tag = icodec->codec_tag; 158 } else { 159 ocodec->codec_tag = 0; 160 } 161 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio; 162 } 163 164 return 0; 165} 166 167static int set_segment_filename(AVFormatContext *s) 168{ 169 SegmentContext *seg = s->priv_data; 170 AVFormatContext *oc = seg->avf; 171 size_t size; 172 173 if (seg->segment_idx_wrap) 174 seg->segment_idx %= seg->segment_idx_wrap; 175 if (av_get_frame_filename(oc->filename, sizeof(oc->filename), 176 s->filename, seg->segment_idx) < 0) { 177 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename); 178 return AVERROR(EINVAL); 179 } 180 181 /* copy modified name in list entry */ 182 size = strlen(av_basename(oc->filename)) + 1; 183 if (seg->entry_prefix) 184 size += strlen(seg->entry_prefix); 185 186 seg->cur_entry.filename = av_mallocz(size); 187 if (!seg->cur_entry.filename) 188 return AVERROR(ENOMEM); 189 snprintf(seg->cur_entry.filename, size, "%s%s", 190 seg->entry_prefix ? seg->entry_prefix : "", 191 av_basename(oc->filename)); 192 193 return 0; 194} 195 196static int segment_start(AVFormatContext *s, int write_header) 197{ 198 SegmentContext *seg = s->priv_data; 199 AVFormatContext *oc = seg->avf; 200 int err = 0; 201 202 if (write_header) { 203 avformat_free_context(oc); 204 seg->avf = NULL; 205 if ((err = segment_mux_init(s)) < 0) 206 return err; 207 oc = seg->avf; 208 } 209 210 seg->segment_idx++; 211 if ((seg->segment_idx_wrap) && (seg->segment_idx%seg->segment_idx_wrap == 0)) 212 seg->segment_idx_wrap_nb++; 213 214 if ((err = set_segment_filename(s)) < 0) 215 return err; 216 217 if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, 218 &s->interrupt_callback, NULL)) < 0) { 219 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename); 220 return err; 221 } 222 223 if (oc->oformat->priv_class && oc->priv_data) 224 av_opt_set(oc->priv_data, "resend_headers", "1", 0); /* mpegts specific */ 225 226 if (write_header) { 227 if ((err = avformat_write_header(oc, NULL)) < 0) 228 return err; 229 } 230 231 seg->is_first_pkt = 1; 232 return 0; 233} 234 235static int segment_list_open(AVFormatContext *s) 236{ 237 SegmentContext *seg = s->priv_data; 238 int ret; 239 240 ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE, 241 &s->interrupt_callback, NULL); 242 if (ret < 0) { 243 av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list); 244 return ret; 245 } 246 247 if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) { 248 SegmentListEntry *entry; 249 double max_duration = 0; 250 251 avio_printf(seg->list_pb, "#EXTM3U\n"); 252 avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n"); 253 avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index); 254 avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n", 255 seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO"); 256 257 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n", 258 seg->segment_list_entries->index); 259 260 for (entry = seg->segment_list_entries; entry; entry = entry->next) 261 max_duration = FFMAX(max_duration, entry->end_time - entry->start_time); 262 avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration)); 263 } else if (seg->list_type == LIST_TYPE_FFCONCAT) { 264 avio_printf(seg->list_pb, "ffconcat version 1.0\n"); 265 } 266 267 return ret; 268} 269 270static void segment_list_print_entry(AVIOContext *list_ioctx, 271 ListType list_type, 272 const SegmentListEntry *list_entry, 273 void *log_ctx) 274{ 275 switch (list_type) { 276 case LIST_TYPE_FLAT: 277 avio_printf(list_ioctx, "%s\n", list_entry->filename); 278 break; 279 case LIST_TYPE_CSV: 280 case LIST_TYPE_EXT: 281 print_csv_escaped_str(list_ioctx, list_entry->filename); 282 avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time); 283 break; 284 case LIST_TYPE_M3U8: 285 avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n", 286 list_entry->end_time - list_entry->start_time, list_entry->filename); 287 break; 288 case LIST_TYPE_FFCONCAT: 289 { 290 char *buf; 291 if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) { 292 av_log(log_ctx, AV_LOG_WARNING, 293 "Error writing list entry '%s' in list file\n", list_entry->filename); 294 return; 295 } 296 avio_printf(list_ioctx, "file %s\n", buf); 297 av_free(buf); 298 break; 299 } 300 default: 301 av_assert0(!"Invalid list type"); 302 } 303} 304 305static int segment_end(AVFormatContext *s, int write_trailer, int is_last) 306{ 307 SegmentContext *seg = s->priv_data; 308 AVFormatContext *oc = seg->avf; 309 int ret = 0; 310 311 av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */ 312 if (write_trailer) 313 ret = av_write_trailer(oc); 314 315 if (ret < 0) 316 av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n", 317 oc->filename); 318 319 if (seg->list) { 320 if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) { 321 SegmentListEntry *entry = av_mallocz(sizeof(*entry)); 322 if (!entry) { 323 ret = AVERROR(ENOMEM); 324 goto end; 325 } 326 327 /* append new element */ 328 memcpy(entry, &seg->cur_entry, sizeof(*entry)); 329 if (!seg->segment_list_entries) 330 seg->segment_list_entries = seg->segment_list_entries_end = entry; 331 else 332 seg->segment_list_entries_end->next = entry; 333 seg->segment_list_entries_end = entry; 334 335 /* drop first item */ 336 if (seg->list_size && seg->segment_count > seg->list_size) { 337 entry = seg->segment_list_entries; 338 seg->segment_list_entries = seg->segment_list_entries->next; 339 av_free(entry->filename); 340 av_freep(&entry); 341 } 342 343 avio_close(seg->list_pb); 344 if ((ret = segment_list_open(s)) < 0) 345 goto end; 346 for (entry = seg->segment_list_entries; entry; entry = entry->next) 347 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s); 348 if (seg->list_type == LIST_TYPE_M3U8 && is_last) 349 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n"); 350 } else { 351 segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s); 352 } 353 avio_flush(seg->list_pb); 354 } 355 356 av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n", 357 seg->avf->filename, seg->segment_count); 358 seg->segment_count++; 359 360end: 361 avio_close(oc->pb); 362 363 return ret; 364} 365 366static int parse_times(void *log_ctx, int64_t **times, int *nb_times, 367 const char *times_str) 368{ 369 char *p; 370 int i, ret = 0; 371 char *times_str1 = av_strdup(times_str); 372 char *saveptr = NULL; 373 374 if (!times_str1) 375 return AVERROR(ENOMEM); 376 377#define FAIL(err) ret = err; goto end 378 379 *nb_times = 1; 380 for (p = times_str1; *p; p++) 381 if (*p == ',') 382 (*nb_times)++; 383 384 *times = av_malloc_array(*nb_times, sizeof(**times)); 385 if (!*times) { 386 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n"); 387 FAIL(AVERROR(ENOMEM)); 388 } 389 390 p = times_str1; 391 for (i = 0; i < *nb_times; i++) { 392 int64_t t; 393 char *tstr = av_strtok(p, ",", &saveptr); 394 p = NULL; 395 396 if (!tstr || !tstr[0]) { 397 av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n", 398 times_str); 399 FAIL(AVERROR(EINVAL)); 400 } 401 402 ret = av_parse_time(&t, tstr, 1); 403 if (ret < 0) { 404 av_log(log_ctx, AV_LOG_ERROR, 405 "Invalid time duration specification '%s' in times list %s\n", tstr, times_str); 406 FAIL(AVERROR(EINVAL)); 407 } 408 (*times)[i] = t; 409 410 /* check on monotonicity */ 411 if (i && (*times)[i-1] > (*times)[i]) { 412 av_log(log_ctx, AV_LOG_ERROR, 413 "Specified time %f is greater than the following time %f\n", 414 (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000); 415 FAIL(AVERROR(EINVAL)); 416 } 417 } 418 419end: 420 av_free(times_str1); 421 return ret; 422} 423 424static int parse_frames(void *log_ctx, int **frames, int *nb_frames, 425 const char *frames_str) 426{ 427 char *p; 428 int i, ret = 0; 429 char *frames_str1 = av_strdup(frames_str); 430 char *saveptr = NULL; 431 432 if (!frames_str1) 433 return AVERROR(ENOMEM); 434 435#define FAIL(err) ret = err; goto end 436 437 *nb_frames = 1; 438 for (p = frames_str1; *p; p++) 439 if (*p == ',') 440 (*nb_frames)++; 441 442 *frames = av_malloc_array(*nb_frames, sizeof(**frames)); 443 if (!*frames) { 444 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n"); 445 FAIL(AVERROR(ENOMEM)); 446 } 447 448 p = frames_str1; 449 for (i = 0; i < *nb_frames; i++) { 450 long int f; 451 char *tailptr; 452 char *fstr = av_strtok(p, ",", &saveptr); 453 454 p = NULL; 455 if (!fstr) { 456 av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n", 457 frames_str); 458 FAIL(AVERROR(EINVAL)); 459 } 460 f = strtol(fstr, &tailptr, 10); 461 if (*tailptr || f <= 0 || f >= INT_MAX) { 462 av_log(log_ctx, AV_LOG_ERROR, 463 "Invalid argument '%s', must be a positive integer <= INT64_MAX\n", 464 fstr); 465 FAIL(AVERROR(EINVAL)); 466 } 467 (*frames)[i] = f; 468 469 /* check on monotonicity */ 470 if (i && (*frames)[i-1] > (*frames)[i]) { 471 av_log(log_ctx, AV_LOG_ERROR, 472 "Specified frame %d is greater than the following frame %d\n", 473 (*frames)[i], (*frames)[i-1]); 474 FAIL(AVERROR(EINVAL)); 475 } 476 } 477 478end: 479 av_free(frames_str1); 480 return ret; 481} 482 483static int open_null_ctx(AVIOContext **ctx) 484{ 485 int buf_size = 32768; 486 uint8_t *buf = av_malloc(buf_size); 487 if (!buf) 488 return AVERROR(ENOMEM); 489 *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL); 490 if (!*ctx) { 491 av_free(buf); 492 return AVERROR(ENOMEM); 493 } 494 return 0; 495} 496 497static void close_null_ctx(AVIOContext *pb) 498{ 499 av_free(pb->buffer); 500 av_free(pb); 501} 502 503static int select_reference_stream(AVFormatContext *s) 504{ 505 SegmentContext *seg = s->priv_data; 506 int ret, i; 507 508 seg->reference_stream_index = -1; 509 if (!strcmp(seg->reference_stream_specifier, "auto")) { 510 /* select first index of type with highest priority */ 511 int type_index_map[AVMEDIA_TYPE_NB]; 512 static const enum AVMediaType type_priority_list[] = { 513 AVMEDIA_TYPE_VIDEO, 514 AVMEDIA_TYPE_AUDIO, 515 AVMEDIA_TYPE_SUBTITLE, 516 AVMEDIA_TYPE_DATA, 517 AVMEDIA_TYPE_ATTACHMENT 518 }; 519 enum AVMediaType type; 520 521 for (i = 0; i < AVMEDIA_TYPE_NB; i++) 522 type_index_map[i] = -1; 523 524 /* select first index for each type */ 525 for (i = 0; i < s->nb_streams; i++) { 526 type = s->streams[i]->codec->codec_type; 527 if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1 528 /* ignore attached pictures/cover art streams */ 529 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC)) 530 type_index_map[type] = i; 531 } 532 533 for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) { 534 type = type_priority_list[i]; 535 if ((seg->reference_stream_index = type_index_map[type]) >= 0) 536 break; 537 } 538 } else { 539 for (i = 0; i < s->nb_streams; i++) { 540 ret = avformat_match_stream_specifier(s, s->streams[i], 541 seg->reference_stream_specifier); 542 if (ret < 0) 543 return ret; 544 if (ret > 0) { 545 seg->reference_stream_index = i; 546 break; 547 } 548 } 549 } 550 551 if (seg->reference_stream_index < 0) { 552 av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n", 553 seg->reference_stream_specifier); 554 return AVERROR(EINVAL); 555 } 556 557 return 0; 558} 559 560static int seg_write_header(AVFormatContext *s) 561{ 562 SegmentContext *seg = s->priv_data; 563 AVFormatContext *oc = NULL; 564 int ret; 565 566 seg->segment_count = 0; 567 if (!seg->write_header_trailer) 568 seg->individual_header_trailer = 0; 569 570 if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) { 571 av_log(s, AV_LOG_ERROR, 572 "segment_time, segment_times, and segment_frames options " 573 "are mutually exclusive, select just one of them\n"); 574 return AVERROR(EINVAL); 575 } 576 577 if (seg->times_str) { 578 if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0) 579 return ret; 580 } else if (seg->frames_str) { 581 if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0) 582 return ret; 583 } else { 584 /* set default value if not specified */ 585 if (!seg->time_str) 586 seg->time_str = av_strdup("2"); 587 if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) { 588 av_log(s, AV_LOG_ERROR, 589 "Invalid time duration specification '%s' for segment_time option\n", 590 seg->time_str); 591 return ret; 592 } 593 } 594 595 if (seg->list) { 596 if (seg->list_type == LIST_TYPE_UNDEFINED) { 597 if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV; 598 else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT; 599 else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8; 600 else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT; 601 else seg->list_type = LIST_TYPE_FLAT; 602 } 603 if ((ret = segment_list_open(s)) < 0) 604 goto fail; 605 } 606 if (seg->list_type == LIST_TYPE_EXT) 607 av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n"); 608 609 if ((ret = select_reference_stream(s)) < 0) 610 goto fail; 611 av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n", 612 seg->reference_stream_index, 613 av_get_media_type_string(s->streams[seg->reference_stream_index]->codec->codec_type)); 614 615 seg->oformat = av_guess_format(seg->format, s->filename, NULL); 616 617 if (!seg->oformat) { 618 ret = AVERROR_MUXER_NOT_FOUND; 619 goto fail; 620 } 621 if (seg->oformat->flags & AVFMT_NOFILE) { 622 av_log(s, AV_LOG_ERROR, "format %s not supported.\n", 623 seg->oformat->name); 624 ret = AVERROR(EINVAL); 625 goto fail; 626 } 627 628 if ((ret = segment_mux_init(s)) < 0) 629 goto fail; 630 oc = seg->avf; 631 632 if ((ret = set_segment_filename(s)) < 0) 633 goto fail; 634 635 if (seg->write_header_trailer) { 636 if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, 637 &s->interrupt_callback, NULL)) < 0) { 638 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename); 639 goto fail; 640 } 641 } else { 642 if ((ret = open_null_ctx(&oc->pb)) < 0) 643 goto fail; 644 } 645 646 if ((ret = avformat_write_header(oc, NULL)) < 0) { 647 avio_close(oc->pb); 648 goto fail; 649 } 650 seg->is_first_pkt = 1; 651 652 if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0) 653 s->avoid_negative_ts = 1; 654 655 if (!seg->write_header_trailer) { 656 close_null_ctx(oc->pb); 657 if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, 658 &s->interrupt_callback, NULL)) < 0) 659 goto fail; 660 } 661 662fail: 663 if (ret) { 664 if (seg->list) 665 avio_close(seg->list_pb); 666 if (seg->avf) 667 avformat_free_context(seg->avf); 668 } 669 return ret; 670} 671 672static int seg_write_packet(AVFormatContext *s, AVPacket *pkt) 673{ 674 SegmentContext *seg = s->priv_data; 675 AVStream *st = s->streams[pkt->stream_index]; 676 int64_t end_pts = INT64_MAX, offset; 677 int start_frame = INT_MAX; 678 int ret; 679 struct tm ti; 680 int64_t usecs; 681 int64_t wrapped_val; 682 683 if (seg->times) { 684 end_pts = seg->segment_count < seg->nb_times ? 685 seg->times[seg->segment_count] : INT64_MAX; 686 } else if (seg->frames) { 687 start_frame = seg->segment_count < seg->nb_frames ? 688 seg->frames[seg->segment_count] : INT_MAX; 689 } else { 690 if (seg->use_clocktime) { 691 int64_t avgt = av_gettime(); 692 time_t sec = avgt / 1000000; 693#if HAVE_LOCALTIME_R 694 localtime_r(&sec, &ti); 695#else 696 ti = *localtime(&sec); 697#endif 698 usecs = (int64_t)(ti.tm_hour*3600 + ti.tm_min*60 + ti.tm_sec) * 1000000 + (avgt % 1000000); 699 wrapped_val = usecs % seg->time; 700 if (seg->last_cut != usecs && wrapped_val < seg->last_val) { 701 seg->cut_pending = 1; 702 seg->last_cut = usecs; 703 } 704 seg->last_val = wrapped_val; 705 } else { 706 end_pts = seg->time * (seg->segment_count+1); 707 } 708 } 709 710 av_dlog(s, "packet stream:%d pts:%s pts_time:%s is_key:%d frame:%d\n", 711 pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), 712 pkt->flags & AV_PKT_FLAG_KEY, 713 pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1); 714 715 if (pkt->stream_index == seg->reference_stream_index && 716 pkt->flags & AV_PKT_FLAG_KEY && 717 (seg->cut_pending || seg->frame_count >= start_frame || 718 (pkt->pts != AV_NOPTS_VALUE && 719 av_compare_ts(pkt->pts, st->time_base, 720 end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0))) { 721 if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0) 722 goto fail; 723 724 if ((ret = segment_start(s, seg->individual_header_trailer)) < 0) 725 goto fail; 726 727 seg->cut_pending = 0; 728 seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap*seg->segment_idx_wrap_nb; 729 seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base); 730 seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q); 731 } else if (pkt->pts != AV_NOPTS_VALUE) { 732 seg->cur_entry.end_time = 733 FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base)); 734 } 735 736 if (seg->is_first_pkt) { 737 av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n", 738 seg->avf->filename, pkt->stream_index, 739 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count); 740 seg->is_first_pkt = 0; 741 } 742 743 av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s", 744 pkt->stream_index, 745 av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q), 746 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), 747 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base)); 748 749 /* compute new timestamps */ 750 offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0), 751 AV_TIME_BASE_Q, st->time_base); 752 if (pkt->pts != AV_NOPTS_VALUE) 753 pkt->pts += offset; 754 if (pkt->dts != AV_NOPTS_VALUE) 755 pkt->dts += offset; 756 757 av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n", 758 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), 759 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base)); 760 761 ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s); 762 763fail: 764 if (pkt->stream_index == seg->reference_stream_index) 765 seg->frame_count++; 766 767 return ret; 768} 769 770static int seg_write_trailer(struct AVFormatContext *s) 771{ 772 SegmentContext *seg = s->priv_data; 773 AVFormatContext *oc = seg->avf; 774 SegmentListEntry *cur, *next; 775 776 int ret; 777 if (!seg->write_header_trailer) { 778 if ((ret = segment_end(s, 0, 1)) < 0) 779 goto fail; 780 open_null_ctx(&oc->pb); 781 ret = av_write_trailer(oc); 782 close_null_ctx(oc->pb); 783 } else { 784 ret = segment_end(s, 1, 1); 785 } 786fail: 787 if (seg->list) 788 avio_close(seg->list_pb); 789 790 av_opt_free(seg); 791 av_freep(&seg->times); 792 av_freep(&seg->frames); 793 794 cur = seg->segment_list_entries; 795 while (cur) { 796 next = cur->next; 797 av_free(cur->filename); 798 av_free(cur); 799 cur = next; 800 } 801 802 avformat_free_context(oc); 803 return ret; 804} 805 806#define OFFSET(x) offsetof(SegmentContext, x) 807#define E AV_OPT_FLAG_ENCODING_PARAM 808static const AVOption options[] = { 809 { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E }, 810 { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, 811 { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, 812 813 { "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"}, 814 { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"}, 815 { "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"}, 816 817 { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, 818 819 { "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" }, 820 { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" }, 821 { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" }, 822 { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" }, 823 { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" }, 824 { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" }, 825 { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" }, 826 827 { "segment_atclocktime", "set segment to be cut at clocktime", OFFSET(use_clocktime), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E}, 828 { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, 829 { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 0, E }, 830 { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E }, 831 { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E }, 832 { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, 833 { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E }, 834 { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, 835 { "segment_wrap_number", "set the number of wrap before the first segment", OFFSET(segment_idx_wrap_nb), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, 836 837 { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E }, 838 { "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 }, 839 { "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E }, 840 { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E }, 841 { NULL }, 842}; 843 844static const AVClass seg_class = { 845 .class_name = "segment muxer", 846 .item_name = av_default_item_name, 847 .option = options, 848 .version = LIBAVUTIL_VERSION_INT, 849}; 850 851AVOutputFormat ff_segment_muxer = { 852 .name = "segment", 853 .long_name = NULL_IF_CONFIG_SMALL("segment"), 854 .priv_data_size = sizeof(SegmentContext), 855 .flags = AVFMT_NOFILE|AVFMT_GLOBALHEADER, 856 .write_header = seg_write_header, 857 .write_packet = seg_write_packet, 858 .write_trailer = seg_write_trailer, 859 .priv_class = &seg_class, 860}; 861 862static const AVClass sseg_class = { 863 .class_name = "stream_segment muxer", 864 .item_name = av_default_item_name, 865 .option = options, 866 .version = LIBAVUTIL_VERSION_INT, 867}; 868 869AVOutputFormat ff_stream_segment_muxer = { 870 .name = "stream_segment,ssegment", 871 .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"), 872 .priv_data_size = sizeof(SegmentContext), 873 .flags = AVFMT_NOFILE, 874 .write_header = seg_write_header, 875 .write_packet = seg_write_packet, 876 .write_trailer = seg_write_trailer, 877 .priv_class = &sseg_class, 878}; 879