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path: root/libavformat/segment.c (plain)
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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 "avio_internal.h"
34#include "internal.h"
35
36#include "libavutil/avassert.h"
37#include "libavutil/internal.h"
38#include "libavutil/log.h"
39#include "libavutil/opt.h"
40#include "libavutil/avstring.h"
41#include "libavutil/parseutils.h"
42#include "libavutil/mathematics.h"
43#include "libavutil/time.h"
44#include "libavutil/timecode.h"
45#include "libavutil/time_internal.h"
46#include "libavutil/timestamp.h"
47
48typedef struct SegmentListEntry {
49 int index;
50 double start_time, end_time;
51 int64_t start_pts;
52 int64_t offset_pts;
53 char *filename;
54 struct SegmentListEntry *next;
55 int64_t last_duration;
56} SegmentListEntry;
57
58typedef enum {
59 LIST_TYPE_UNDEFINED = -1,
60 LIST_TYPE_FLAT = 0,
61 LIST_TYPE_CSV,
62 LIST_TYPE_M3U8,
63 LIST_TYPE_EXT, ///< deprecated
64 LIST_TYPE_FFCONCAT,
65 LIST_TYPE_NB,
66} ListType;
67
68#define SEGMENT_LIST_FLAG_CACHE 1
69#define SEGMENT_LIST_FLAG_LIVE 2
70
71typedef struct SegmentContext {
72 const AVClass *class; /**< Class for private options. */
73 int segment_idx; ///< index of the segment file to write, starting from 0
74 int segment_idx_wrap; ///< number after which the index wraps
75 int segment_idx_wrap_nb; ///< number of time the index has wraped
76 int segment_count; ///< number of segment files already written
77 AVOutputFormat *oformat;
78 AVFormatContext *avf;
79 char *format; ///< format to use for output segment files
80 char *format_options_str; ///< format options to use for output segment files
81 AVDictionary *format_options;
82 char *list; ///< filename for the segment list file
83 int list_flags; ///< flags affecting list generation
84 int list_size; ///< number of entries for the segment list file
85
86 int use_clocktime; ///< flag to cut segments at regular clock time
87 int64_t clocktime_offset; //< clock offset for cutting the segments at regular clock time
88 int64_t clocktime_wrap_duration; //< wrapping duration considered for starting a new segment
89 int64_t last_val; ///< remember last time for wrap around detection
90 int cut_pending;
91 int header_written; ///< whether we've already called avformat_write_header
92
93 char *entry_prefix; ///< prefix to add to list entry filenames
94 int list_type; ///< set the list type
95 AVIOContext *list_pb; ///< list file put-byte context
96 char *time_str; ///< segment duration specification string
97 int64_t time; ///< segment duration
98 int use_strftime; ///< flag to expand filename with strftime
99 int increment_tc; ///< flag to increment timecode if found
100
101 char *times_str; ///< segment times specification string
102 int64_t *times; ///< list of segment interval specification
103 int nb_times; ///< number of elments in the times array
104
105 char *frames_str; ///< segment frame numbers specification string
106 int *frames; ///< list of frame number specification
107 int nb_frames; ///< number of elments in the frames array
108 int frame_count; ///< total number of reference frames
109 int segment_frame_count; ///< number of reference frames in the segment
110
111 int64_t time_delta;
112 int individual_header_trailer; /**< Set by a private option. */
113 int write_header_trailer; /**< Set by a private option. */
114 char *header_filename; ///< filename to write the output header to
115
116 int reset_timestamps; ///< reset timestamps at the begin of each segment
117 int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
118 char *reference_stream_specifier; ///< reference stream specifier
119 int reference_stream_index;
120 int break_non_keyframes;
121 int write_empty;
122
123 int use_rename;
124 char temp_list_filename[1024];
125
126 SegmentListEntry cur_entry;
127 SegmentListEntry *segment_list_entries;
128 SegmentListEntry *segment_list_entries_end;
129} SegmentContext;
130
131static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
132{
133 int needs_quoting = !!str[strcspn(str, "\",\n\r")];
134
135 if (needs_quoting)
136 avio_w8(ctx, '"');
137
138 for (; *str; str++) {
139 if (*str == '"')
140 avio_w8(ctx, '"');
141 avio_w8(ctx, *str);
142 }
143 if (needs_quoting)
144 avio_w8(ctx, '"');
145}
146
147static int segment_mux_init(AVFormatContext *s)
148{
149 SegmentContext *seg = s->priv_data;
150 AVFormatContext *oc;
151 int i;
152 int ret;
153
154 ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
155 if (ret < 0)
156 return ret;
157 oc = seg->avf;
158
159 oc->interrupt_callback = s->interrupt_callback;
160 oc->max_delay = s->max_delay;
161 av_dict_copy(&oc->metadata, s->metadata, 0);
162 oc->opaque = s->opaque;
163 oc->io_close = s->io_close;
164 oc->io_open = s->io_open;
165 oc->flags = s->flags;
166
167 for (i = 0; i < s->nb_streams; i++) {
168 AVStream *st;
169 AVCodecParameters *ipar, *opar;
170
171 if (!(st = avformat_new_stream(oc, NULL)))
172 return AVERROR(ENOMEM);
173 ipar = s->streams[i]->codecpar;
174 opar = st->codecpar;
175 avcodec_parameters_copy(opar, ipar);
176 if (!oc->oformat->codec_tag ||
177 av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
178 av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
179 opar->codec_tag = ipar->codec_tag;
180 } else {
181 opar->codec_tag = 0;
182 }
183 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
184 st->time_base = s->streams[i]->time_base;
185 av_dict_copy(&st->metadata, s->streams[i]->metadata, 0);
186 }
187
188 return 0;
189}
190
191static int set_segment_filename(AVFormatContext *s)
192{
193 SegmentContext *seg = s->priv_data;
194 AVFormatContext *oc = seg->avf;
195 size_t size;
196 int ret;
197
198 if (seg->segment_idx_wrap)
199 seg->segment_idx %= seg->segment_idx_wrap;
200 if (seg->use_strftime) {
201 time_t now0;
202 struct tm *tm, tmpbuf;
203 time(&now0);
204 tm = localtime_r(&now0, &tmpbuf);
205 if (!strftime(oc->filename, sizeof(oc->filename), s->filename, tm)) {
206 av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
207 return AVERROR(EINVAL);
208 }
209 } else if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
210 s->filename, seg->segment_idx) < 0) {
211 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
212 return AVERROR(EINVAL);
213 }
214
215 /* copy modified name in list entry */
216 size = strlen(av_basename(oc->filename)) + 1;
217 if (seg->entry_prefix)
218 size += strlen(seg->entry_prefix);
219
220 if ((ret = av_reallocp(&seg->cur_entry.filename, size)) < 0)
221 return ret;
222 snprintf(seg->cur_entry.filename, size, "%s%s",
223 seg->entry_prefix ? seg->entry_prefix : "",
224 av_basename(oc->filename));
225
226 return 0;
227}
228
229static int segment_start(AVFormatContext *s, int write_header)
230{
231 SegmentContext *seg = s->priv_data;
232 AVFormatContext *oc = seg->avf;
233 int err = 0;
234
235 if (write_header) {
236 avformat_free_context(oc);
237 seg->avf = NULL;
238 if ((err = segment_mux_init(s)) < 0)
239 return err;
240 oc = seg->avf;
241 }
242
243 seg->segment_idx++;
244 if ((seg->segment_idx_wrap) && (seg->segment_idx % seg->segment_idx_wrap == 0))
245 seg->segment_idx_wrap_nb++;
246
247 if ((err = set_segment_filename(s)) < 0)
248 return err;
249
250 if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0) {
251 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
252 return err;
253 }
254 if (!seg->individual_header_trailer)
255 oc->pb->seekable = 0;
256
257 if (oc->oformat->priv_class && oc->priv_data)
258 av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
259
260 if (write_header) {
261 AVDictionary *options = NULL;
262 av_dict_copy(&options, seg->format_options, 0);
263 av_dict_set(&options, "fflags", "-autobsf", 0);
264 err = avformat_write_header(oc, &options);
265 av_dict_free(&options);
266 if (err < 0)
267 return err;
268 }
269
270 seg->segment_frame_count = 0;
271 return 0;
272}
273
274static int segment_list_open(AVFormatContext *s)
275{
276 SegmentContext *seg = s->priv_data;
277 int ret;
278
279 snprintf(seg->temp_list_filename, sizeof(seg->temp_list_filename), seg->use_rename ? "%s.tmp" : "%s", seg->list);
280 ret = s->io_open(s, &seg->list_pb, seg->temp_list_filename, AVIO_FLAG_WRITE, NULL);
281 if (ret < 0) {
282 av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
283 return ret;
284 }
285
286 if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
287 SegmentListEntry *entry;
288 double max_duration = 0;
289
290 avio_printf(seg->list_pb, "#EXTM3U\n");
291 avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
292 avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
293 avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
294 seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
295
296 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
297 seg->segment_list_entries->index);
298
299 for (entry = seg->segment_list_entries; entry; entry = entry->next)
300 max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
301 avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
302 } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
303 avio_printf(seg->list_pb, "ffconcat version 1.0\n");
304 }
305
306 return ret;
307}
308
309static void segment_list_print_entry(AVIOContext *list_ioctx,
310 ListType list_type,
311 const SegmentListEntry *list_entry,
312 void *log_ctx)
313{
314 switch (list_type) {
315 case LIST_TYPE_FLAT:
316 avio_printf(list_ioctx, "%s\n", list_entry->filename);
317 break;
318 case LIST_TYPE_CSV:
319 case LIST_TYPE_EXT:
320 print_csv_escaped_str(list_ioctx, list_entry->filename);
321 avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
322 break;
323 case LIST_TYPE_M3U8:
324 avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
325 list_entry->end_time - list_entry->start_time, list_entry->filename);
326 break;
327 case LIST_TYPE_FFCONCAT:
328 {
329 char *buf;
330 if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
331 av_log(log_ctx, AV_LOG_WARNING,
332 "Error writing list entry '%s' in list file\n", list_entry->filename);
333 return;
334 }
335 avio_printf(list_ioctx, "file %s\n", buf);
336 av_free(buf);
337 break;
338 }
339 default:
340 av_assert0(!"Invalid list type");
341 }
342}
343
344static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
345{
346 SegmentContext *seg = s->priv_data;
347 AVFormatContext *oc = seg->avf;
348 int ret = 0;
349 AVTimecode tc;
350 AVRational rate;
351 AVDictionaryEntry *tcr;
352 char buf[AV_TIMECODE_STR_SIZE];
353 int i;
354 int err;
355
356 if (!oc || !oc->pb)
357 return AVERROR(EINVAL);
358
359 av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
360 if (write_trailer)
361 ret = av_write_trailer(oc);
362
363 if (ret < 0)
364 av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
365 oc->filename);
366
367 if (seg->list) {
368 if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
369 SegmentListEntry *entry = av_mallocz(sizeof(*entry));
370 if (!entry) {
371 ret = AVERROR(ENOMEM);
372 goto end;
373 }
374
375 /* append new element */
376 memcpy(entry, &seg->cur_entry, sizeof(*entry));
377 entry->filename = av_strdup(entry->filename);
378 if (!seg->segment_list_entries)
379 seg->segment_list_entries = seg->segment_list_entries_end = entry;
380 else
381 seg->segment_list_entries_end->next = entry;
382 seg->segment_list_entries_end = entry;
383
384 /* drop first item */
385 if (seg->list_size && seg->segment_count >= seg->list_size) {
386 entry = seg->segment_list_entries;
387 seg->segment_list_entries = seg->segment_list_entries->next;
388 av_freep(&entry->filename);
389 av_freep(&entry);
390 }
391
392 if ((ret = segment_list_open(s)) < 0)
393 goto end;
394 for (entry = seg->segment_list_entries; entry; entry = entry->next)
395 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
396 if (seg->list_type == LIST_TYPE_M3U8 && is_last)
397 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
398 ff_format_io_close(s, &seg->list_pb);
399 if (seg->use_rename)
400 ff_rename(seg->temp_list_filename, seg->list, s);
401 } else {
402 segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
403 avio_flush(seg->list_pb);
404 }
405 }
406
407 av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
408 seg->avf->filename, seg->segment_count);
409 seg->segment_count++;
410
411 if (seg->increment_tc) {
412 tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
413 if (tcr) {
414 /* search the first video stream */
415 for (i = 0; i < s->nb_streams; i++) {
416 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
417 rate = s->streams[i]->avg_frame_rate;/* Get fps from the video stream */
418 err = av_timecode_init_from_string(&tc, rate, tcr->value, s);
419 if (err < 0) {
420 av_log(s, AV_LOG_WARNING, "Could not increment timecode, error occurred during timecode creation.");
421 break;
422 }
423 tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(rate));/* increment timecode */
424 av_dict_set(&s->metadata, "timecode",
425 av_timecode_make_string(&tc, buf, 0), 0);
426 break;
427 }
428 }
429 } else {
430 av_log(s, AV_LOG_WARNING, "Could not increment timecode, no timecode metadata found");
431 }
432 }
433
434end:
435 ff_format_io_close(oc, &oc->pb);
436
437 return ret;
438}
439
440static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
441 const char *times_str)
442{
443 char *p;
444 int i, ret = 0;
445 char *times_str1 = av_strdup(times_str);
446 char *saveptr = NULL;
447
448 if (!times_str1)
449 return AVERROR(ENOMEM);
450
451#define FAIL(err) ret = err; goto end
452
453 *nb_times = 1;
454 for (p = times_str1; *p; p++)
455 if (*p == ',')
456 (*nb_times)++;
457
458 *times = av_malloc_array(*nb_times, sizeof(**times));
459 if (!*times) {
460 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
461 FAIL(AVERROR(ENOMEM));
462 }
463
464 p = times_str1;
465 for (i = 0; i < *nb_times; i++) {
466 int64_t t;
467 char *tstr = av_strtok(p, ",", &saveptr);
468 p = NULL;
469
470 if (!tstr || !tstr[0]) {
471 av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
472 times_str);
473 FAIL(AVERROR(EINVAL));
474 }
475
476 ret = av_parse_time(&t, tstr, 1);
477 if (ret < 0) {
478 av_log(log_ctx, AV_LOG_ERROR,
479 "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
480 FAIL(AVERROR(EINVAL));
481 }
482 (*times)[i] = t;
483
484 /* check on monotonicity */
485 if (i && (*times)[i-1] > (*times)[i]) {
486 av_log(log_ctx, AV_LOG_ERROR,
487 "Specified time %f is greater than the following time %f\n",
488 (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
489 FAIL(AVERROR(EINVAL));
490 }
491 }
492
493end:
494 av_free(times_str1);
495 return ret;
496}
497
498static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
499 const char *frames_str)
500{
501 char *p;
502 int i, ret = 0;
503 char *frames_str1 = av_strdup(frames_str);
504 char *saveptr = NULL;
505
506 if (!frames_str1)
507 return AVERROR(ENOMEM);
508
509#define FAIL(err) ret = err; goto end
510
511 *nb_frames = 1;
512 for (p = frames_str1; *p; p++)
513 if (*p == ',')
514 (*nb_frames)++;
515
516 *frames = av_malloc_array(*nb_frames, sizeof(**frames));
517 if (!*frames) {
518 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
519 FAIL(AVERROR(ENOMEM));
520 }
521
522 p = frames_str1;
523 for (i = 0; i < *nb_frames; i++) {
524 long int f;
525 char *tailptr;
526 char *fstr = av_strtok(p, ",", &saveptr);
527
528 p = NULL;
529 if (!fstr) {
530 av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
531 frames_str);
532 FAIL(AVERROR(EINVAL));
533 }
534 f = strtol(fstr, &tailptr, 10);
535 if (*tailptr || f <= 0 || f >= INT_MAX) {
536 av_log(log_ctx, AV_LOG_ERROR,
537 "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
538 fstr);
539 FAIL(AVERROR(EINVAL));
540 }
541 (*frames)[i] = f;
542
543 /* check on monotonicity */
544 if (i && (*frames)[i-1] > (*frames)[i]) {
545 av_log(log_ctx, AV_LOG_ERROR,
546 "Specified frame %d is greater than the following frame %d\n",
547 (*frames)[i], (*frames)[i-1]);
548 FAIL(AVERROR(EINVAL));
549 }
550 }
551
552end:
553 av_free(frames_str1);
554 return ret;
555}
556
557static int open_null_ctx(AVIOContext **ctx)
558{
559 int buf_size = 32768;
560 uint8_t *buf = av_malloc(buf_size);
561 if (!buf)
562 return AVERROR(ENOMEM);
563 *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
564 if (!*ctx) {
565 av_free(buf);
566 return AVERROR(ENOMEM);
567 }
568 return 0;
569}
570
571static void close_null_ctxp(AVIOContext **pb)
572{
573 av_freep(&(*pb)->buffer);
574 av_freep(pb);
575}
576
577static int select_reference_stream(AVFormatContext *s)
578{
579 SegmentContext *seg = s->priv_data;
580 int ret, i;
581
582 seg->reference_stream_index = -1;
583 if (!strcmp(seg->reference_stream_specifier, "auto")) {
584 /* select first index of type with highest priority */
585 int type_index_map[AVMEDIA_TYPE_NB];
586 static const enum AVMediaType type_priority_list[] = {
587 AVMEDIA_TYPE_VIDEO,
588 AVMEDIA_TYPE_AUDIO,
589 AVMEDIA_TYPE_SUBTITLE,
590 AVMEDIA_TYPE_DATA,
591 AVMEDIA_TYPE_ATTACHMENT
592 };
593 enum AVMediaType type;
594
595 for (i = 0; i < AVMEDIA_TYPE_NB; i++)
596 type_index_map[i] = -1;
597
598 /* select first index for each type */
599 for (i = 0; i < s->nb_streams; i++) {
600 type = s->streams[i]->codecpar->codec_type;
601 if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
602 /* ignore attached pictures/cover art streams */
603 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
604 type_index_map[type] = i;
605 }
606
607 for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
608 type = type_priority_list[i];
609 if ((seg->reference_stream_index = type_index_map[type]) >= 0)
610 break;
611 }
612 } else {
613 for (i = 0; i < s->nb_streams; i++) {
614 ret = avformat_match_stream_specifier(s, s->streams[i],
615 seg->reference_stream_specifier);
616 if (ret < 0)
617 return ret;
618 if (ret > 0) {
619 seg->reference_stream_index = i;
620 break;
621 }
622 }
623 }
624
625 if (seg->reference_stream_index < 0) {
626 av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
627 seg->reference_stream_specifier);
628 return AVERROR(EINVAL);
629 }
630
631 return 0;
632}
633
634static void seg_free(AVFormatContext *s)
635{
636 SegmentContext *seg = s->priv_data;
637 ff_format_io_close(seg->avf, &seg->list_pb);
638 avformat_free_context(seg->avf);
639 seg->avf = NULL;
640}
641
642static int seg_init(AVFormatContext *s)
643{
644 SegmentContext *seg = s->priv_data;
645 AVFormatContext *oc = seg->avf;
646 AVDictionary *options = NULL;
647 int ret;
648 int i;
649
650 seg->segment_count = 0;
651 if (!seg->write_header_trailer)
652 seg->individual_header_trailer = 0;
653
654 if (seg->header_filename) {
655 seg->write_header_trailer = 1;
656 seg->individual_header_trailer = 0;
657 }
658
659 if (seg->initial_offset > 0) {
660 av_log(s, AV_LOG_WARNING, "NOTE: the option initial_offset is deprecated,"
661 "you can use output_ts_offset instead of it\n");
662 }
663
664 if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
665 av_log(s, AV_LOG_ERROR,
666 "segment_time, segment_times, and segment_frames options "
667 "are mutually exclusive, select just one of them\n");
668 return AVERROR(EINVAL);
669 }
670
671 if (seg->times_str) {
672 if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
673 return ret;
674 } else if (seg->frames_str) {
675 if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
676 return ret;
677 } else {
678 /* set default value if not specified */
679 if (!seg->time_str)
680 seg->time_str = av_strdup("2");
681 if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
682 av_log(s, AV_LOG_ERROR,
683 "Invalid time duration specification '%s' for segment_time option\n",
684 seg->time_str);
685 return ret;
686 }
687 if (seg->use_clocktime) {
688 if (seg->time <= 0) {
689 av_log(s, AV_LOG_ERROR, "Invalid negative segment_time with segment_atclocktime option set\n");
690 return AVERROR(EINVAL);
691 }
692 seg->clocktime_offset = seg->time - (seg->clocktime_offset % seg->time);
693 }
694 }
695
696 if (seg->format_options_str) {
697 ret = av_dict_parse_string(&seg->format_options, seg->format_options_str, "=", ":", 0);
698 if (ret < 0) {
699 av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n",
700 seg->format_options_str);
701 return ret;
702 }
703 }
704
705 if (seg->list) {
706 if (seg->list_type == LIST_TYPE_UNDEFINED) {
707 if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
708 else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
709 else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
710 else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
711 else seg->list_type = LIST_TYPE_FLAT;
712 }
713 if (!seg->list_size && seg->list_type != LIST_TYPE_M3U8) {
714 if ((ret = segment_list_open(s)) < 0)
715 return ret;
716 } else {
717 const char *proto = avio_find_protocol_name(seg->list);
718 seg->use_rename = proto && !strcmp(proto, "file");
719 }
720 }
721
722 if (seg->list_type == LIST_TYPE_EXT)
723 av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
724
725 if ((ret = select_reference_stream(s)) < 0)
726 return ret;
727 av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
728 seg->reference_stream_index,
729 av_get_media_type_string(s->streams[seg->reference_stream_index]->codecpar->codec_type));
730
731 seg->oformat = av_guess_format(seg->format, s->filename, NULL);
732
733 if (!seg->oformat)
734 return AVERROR_MUXER_NOT_FOUND;
735 if (seg->oformat->flags & AVFMT_NOFILE) {
736 av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
737 seg->oformat->name);
738 return AVERROR(EINVAL);
739 }
740
741 if ((ret = segment_mux_init(s)) < 0)
742 return ret;
743
744 if ((ret = set_segment_filename(s)) < 0)
745 return ret;
746 oc = seg->avf;
747
748 if (seg->write_header_trailer) {
749 if ((ret = s->io_open(s, &oc->pb,
750 seg->header_filename ? seg->header_filename : oc->filename,
751 AVIO_FLAG_WRITE, NULL)) < 0) {
752 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
753 return ret;
754 }
755 if (!seg->individual_header_trailer)
756 oc->pb->seekable = 0;
757 } else {
758 if ((ret = open_null_ctx(&oc->pb)) < 0)
759 return ret;
760 }
761
762 av_dict_copy(&options, seg->format_options, 0);
763 av_dict_set(&options, "fflags", "-autobsf", 0);
764 ret = avformat_init_output(oc, &options);
765 if (av_dict_count(options)) {
766 av_log(s, AV_LOG_ERROR,
767 "Some of the provided format options in '%s' are not recognized\n", seg->format_options_str);
768 av_dict_free(&options);
769 return AVERROR(EINVAL);
770 }
771 av_dict_free(&options);
772
773 if (ret < 0) {
774 ff_format_io_close(oc, &oc->pb);
775 return ret;
776 }
777 seg->segment_frame_count = 0;
778
779 av_assert0(s->nb_streams == oc->nb_streams);
780 if (ret == AVSTREAM_INIT_IN_WRITE_HEADER) {
781 ret = avformat_write_header(oc, NULL);
782 if (ret < 0)
783 return ret;
784 seg->header_written = 1;
785 }
786
787 for (i = 0; i < s->nb_streams; i++) {
788 AVStream *inner_st = oc->streams[i];
789 AVStream *outer_st = s->streams[i];
790 avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
791 }
792
793 if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
794 s->avoid_negative_ts = 1;
795
796 return ret;
797}
798
799static int seg_write_header(AVFormatContext *s)
800{
801 SegmentContext *seg = s->priv_data;
802 AVFormatContext *oc = seg->avf;
803 int ret, i;
804
805 if (!seg->header_written) {
806 for (i = 0; i < s->nb_streams; i++) {
807 AVStream *st = oc->streams[i];
808 AVCodecParameters *ipar, *opar;
809
810 ipar = s->streams[i]->codecpar;
811 opar = oc->streams[i]->codecpar;
812 avcodec_parameters_copy(opar, ipar);
813 if (!oc->oformat->codec_tag ||
814 av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
815 av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
816 opar->codec_tag = ipar->codec_tag;
817 } else {
818 opar->codec_tag = 0;
819 }
820 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
821 st->time_base = s->streams[i]->time_base;
822 }
823 ret = avformat_write_header(oc, NULL);
824 if (ret < 0)
825 return ret;
826 }
827
828 if (!seg->write_header_trailer || seg->header_filename) {
829 if (seg->header_filename) {
830 av_write_frame(oc, NULL);
831 ff_format_io_close(oc, &oc->pb);
832 } else {
833 close_null_ctxp(&oc->pb);
834 }
835 if ((ret = oc->io_open(oc, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
836 return ret;
837 if (!seg->individual_header_trailer)
838 oc->pb->seekable = 0;
839 }
840
841 return 0;
842}
843
844static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
845{
846 SegmentContext *seg = s->priv_data;
847 AVStream *st = s->streams[pkt->stream_index];
848 int64_t end_pts = INT64_MAX, offset;
849 int start_frame = INT_MAX;
850 int ret;
851 struct tm ti;
852 int64_t usecs;
853 int64_t wrapped_val;
854
855 if (!seg->avf || !seg->avf->pb)
856 return AVERROR(EINVAL);
857
858calc_times:
859 if (seg->times) {
860 end_pts = seg->segment_count < seg->nb_times ?
861 seg->times[seg->segment_count] : INT64_MAX;
862 } else if (seg->frames) {
863 start_frame = seg->segment_count < seg->nb_frames ?
864 seg->frames[seg->segment_count] : INT_MAX;
865 } else {
866 if (seg->use_clocktime) {
867 int64_t avgt = av_gettime();
868 time_t sec = avgt / 1000000;
869 localtime_r(&sec, &ti);
870 usecs = (int64_t)(ti.tm_hour * 3600 + ti.tm_min * 60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
871 wrapped_val = (usecs + seg->clocktime_offset) % seg->time;
872 if (wrapped_val < seg->last_val && wrapped_val < seg->clocktime_wrap_duration)
873 seg->cut_pending = 1;
874 seg->last_val = wrapped_val;
875 } else {
876 end_pts = seg->time * (seg->segment_count + 1);
877 }
878 }
879
880 ff_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
881 pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
882 av_ts2timestr(pkt->duration, &st->time_base),
883 pkt->flags & AV_PKT_FLAG_KEY,
884 pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
885
886 if (pkt->stream_index == seg->reference_stream_index &&
887 (pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
888 (seg->segment_frame_count > 0 || seg->write_empty) &&
889 (seg->cut_pending || seg->frame_count >= start_frame ||
890 (pkt->pts != AV_NOPTS_VALUE &&
891 av_compare_ts(pkt->pts, st->time_base,
892 end_pts - seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
893 /* sanitize end time in case last packet didn't have a defined duration */
894 if (seg->cur_entry.last_duration == 0)
895 seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
896
897 if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
898 goto fail;
899
900 if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
901 goto fail;
902
903 seg->cut_pending = 0;
904 seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
905 seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
906 seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
907 seg->cur_entry.end_time = seg->cur_entry.start_time;
908
909 if (seg->times || (!seg->frames && !seg->use_clocktime) && seg->write_empty)
910 goto calc_times;
911 }
912
913 if (pkt->stream_index == seg->reference_stream_index) {
914 if (pkt->pts != AV_NOPTS_VALUE)
915 seg->cur_entry.end_time =
916 FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
917 seg->cur_entry.last_duration = pkt->duration;
918 }
919
920 if (seg->segment_frame_count == 0) {
921 av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
922 seg->avf->filename, pkt->stream_index,
923 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
924 }
925
926 av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
927 pkt->stream_index,
928 av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
929 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
930 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
931
932 /* compute new timestamps */
933 offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
934 AV_TIME_BASE_Q, st->time_base);
935 if (pkt->pts != AV_NOPTS_VALUE)
936 pkt->pts += offset;
937 if (pkt->dts != AV_NOPTS_VALUE)
938 pkt->dts += offset;
939
940 av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
941 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
942 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
943
944 ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s, seg->initial_offset || seg->reset_timestamps);
945
946fail:
947 if (pkt->stream_index == seg->reference_stream_index) {
948 seg->frame_count++;
949 seg->segment_frame_count++;
950 }
951
952 return ret;
953}
954
955static int seg_write_trailer(struct AVFormatContext *s)
956{
957 SegmentContext *seg = s->priv_data;
958 AVFormatContext *oc = seg->avf;
959 SegmentListEntry *cur, *next;
960 int ret = 0;
961
962 if (!oc)
963 goto fail;
964
965 if (!seg->write_header_trailer) {
966 if ((ret = segment_end(s, 0, 1)) < 0)
967 goto fail;
968 if ((ret = open_null_ctx(&oc->pb)) < 0)
969 goto fail;
970 ret = av_write_trailer(oc);
971 close_null_ctxp(&oc->pb);
972 } else {
973 ret = segment_end(s, 1, 1);
974 }
975fail:
976 if (seg->list)
977 ff_format_io_close(s, &seg->list_pb);
978
979 av_dict_free(&seg->format_options);
980 av_opt_free(seg);
981 av_freep(&seg->times);
982 av_freep(&seg->frames);
983 av_freep(&seg->cur_entry.filename);
984
985 cur = seg->segment_list_entries;
986 while (cur) {
987 next = cur->next;
988 av_freep(&cur->filename);
989 av_free(cur);
990 cur = next;
991 }
992
993 avformat_free_context(oc);
994 seg->avf = NULL;
995 return ret;
996}
997
998static int seg_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
999{
1000 SegmentContext *seg = s->priv_data;
1001 AVFormatContext *oc = seg->avf;
1002 if (oc->oformat->check_bitstream) {
1003 int ret = oc->oformat->check_bitstream(oc, pkt);
1004 if (ret == 1) {
1005 AVStream *st = s->streams[pkt->stream_index];
1006 AVStream *ost = oc->streams[pkt->stream_index];
1007 st->internal->bsfcs = ost->internal->bsfcs;
1008 st->internal->nb_bsfcs = ost->internal->nb_bsfcs;
1009 ost->internal->bsfcs = NULL;
1010 ost->internal->nb_bsfcs = 0;
1011 }
1012 return ret;
1013 }
1014 return 1;
1015}
1016
1017#define OFFSET(x) offsetof(SegmentContext, x)
1018#define E AV_OPT_FLAG_ENCODING_PARAM
1019static const AVOption options[] = {
1020 { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },
1021 { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1022 { "segment_format_options", "set list of options for the container format used for the segments", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1023 { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1024 { "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1025
1026 { "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"},
1027 { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
1028 { "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"},
1029
1030 { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1031
1032 { "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" },
1033 { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
1034 { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },
1035 { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },
1036 { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
1037 { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1038 { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1039
1040 { "segment_atclocktime", "set segment to be cut at clocktime", OFFSET(use_clocktime), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E},
1041 { "segment_clocktime_offset", "set segment clocktime offset", OFFSET(clocktime_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 86400000000LL, E},
1042 { "segment_clocktime_wrap_duration", "set segment clocktime wrapping duration", OFFSET(clocktime_wrap_duration), AV_OPT_TYPE_DURATION, {.i64 = INT64_MAX}, 0, INT64_MAX, E},
1043 { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1044 { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 0, E },
1045 { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1046 { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1047 { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1048 { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1049 { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1050 { "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 },
1051 { "strftime", "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1052 { "increment_tc", "increment timecode between each segment", OFFSET(increment_tc), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1053 { "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1054
1055 { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1056 { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1057 { "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1058 { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
1059 { "write_empty_segments", "allow writing empty 'filler' segments", OFFSET(write_empty), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1060 { NULL },
1061};
1062
1063static const AVClass seg_class = {
1064 .class_name = "segment muxer",
1065 .item_name = av_default_item_name,
1066 .option = options,
1067 .version = LIBAVUTIL_VERSION_INT,
1068};
1069
1070AVOutputFormat ff_segment_muxer = {
1071 .name = "segment",
1072 .long_name = NULL_IF_CONFIG_SMALL("segment"),
1073 .priv_data_size = sizeof(SegmentContext),
1074 .flags = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
1075 .init = seg_init,
1076 .write_header = seg_write_header,
1077 .write_packet = seg_write_packet,
1078 .write_trailer = seg_write_trailer,
1079 .deinit = seg_free,
1080 .check_bitstream = seg_check_bitstream,
1081 .priv_class = &seg_class,
1082};
1083
1084static const AVClass sseg_class = {
1085 .class_name = "stream_segment muxer",
1086 .item_name = av_default_item_name,
1087 .option = options,
1088 .version = LIBAVUTIL_VERSION_INT,
1089};
1090
1091AVOutputFormat ff_stream_segment_muxer = {
1092 .name = "stream_segment,ssegment",
1093 .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
1094 .priv_data_size = sizeof(SegmentContext),
1095 .flags = AVFMT_NOFILE,
1096 .init = seg_init,
1097 .write_header = seg_write_header,
1098 .write_packet = seg_write_packet,
1099 .write_trailer = seg_write_trailer,
1100 .deinit = seg_free,
1101 .check_bitstream = seg_check_bitstream,
1102 .priv_class = &sseg_class,
1103};
1104
generated by cgit at 2024-05-17 02:02:44 (GMT)