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lavc/aarch64: Fix addp overflow in ff_pred16x16_plane_neon_10
[ffmpeg.git] / libavformat / segment.c
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 #include <float.h>
28 #include <time.h>
29
30 #include "avformat.h"
31 #include "avio_internal.h"
32 #include "internal.h"
33
34 #include "libavutil/avassert.h"
35 #include "libavutil/internal.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/timecode.h"
43 #include "libavutil/time_internal.h"
44 #include "libavutil/timestamp.h"
45
46 typedef struct SegmentListEntry {
47 int index;
48 double start_time, end_time;
49 int64_t start_pts;
50 int64_t offset_pts;
51 char *filename;
52 struct SegmentListEntry *next;
53 int64_t last_duration;
54 } SegmentListEntry;
55
56 typedef enum {
57 LIST_TYPE_UNDEFINED = -1,
58 LIST_TYPE_FLAT = 0,
59 LIST_TYPE_CSV,
60 LIST_TYPE_M3U8,
61 LIST_TYPE_EXT, ///< deprecated
62 LIST_TYPE_FFCONCAT,
63 LIST_TYPE_NB,
64 } ListType;
65
66 #define SEGMENT_LIST_FLAG_CACHE 1
67 #define SEGMENT_LIST_FLAG_LIVE 2
68
69 typedef struct SegmentContext {
70 const AVClass *class; /**< Class for private options. */
71 int segment_idx; ///< index of the segment file to write, starting from 0
72 int segment_idx_wrap; ///< number after which the index wraps
73 int segment_idx_wrap_nb; ///< number of time the index has wraped
74 int segment_count; ///< number of segment files already written
75 const AVOutputFormat *oformat;
76 AVFormatContext *avf;
77 char *format; ///< format to use for output segment files
78 AVDictionary *format_options;
79 char *list; ///< filename for the segment list file
80 int list_flags; ///< flags affecting list generation
81 int list_size; ///< number of entries for the segment list file
82
83 int is_nullctx; ///< whether avf->pb is a nullctx
84 int use_clocktime; ///< flag to cut segments at regular clock time
85 int64_t clocktime_offset; //< clock offset for cutting the segments at regular clock time
86 int64_t clocktime_wrap_duration; //< wrapping duration considered for starting a new segment
87 int64_t last_val; ///< remember last time for wrap around detection
88 int cut_pending;
89 int header_written; ///< whether we've already called avformat_write_header
90
91 char *entry_prefix; ///< prefix to add to list entry filenames
92 int list_type; ///< set the list type
93 AVIOContext *list_pb; ///< list file put-byte context
94 int64_t time; ///< segment duration
95 int use_strftime; ///< flag to expand filename with strftime
96 int increment_tc; ///< flag to increment timecode if found
97
98 char *times_str; ///< segment times specification string
99 int64_t *times; ///< list of segment interval specification
100 int nb_times; ///< number of elments in the times array
101
102 char *frames_str; ///< segment frame numbers specification string
103 int *frames; ///< list of frame number specification
104 int nb_frames; ///< number of elments in the frames array
105 int frame_count; ///< total number of reference frames
106 int segment_frame_count; ///< number of reference frames in the segment
107
108 int64_t time_delta;
109 int individual_header_trailer; /**< Set by a private option. */
110 int write_header_trailer; /**< Set by a private option. */
111 char *header_filename; ///< filename to write the output header to
112
113 int reset_timestamps; ///< reset timestamps at the beginning of each segment
114 int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
115 char *reference_stream_specifier; ///< reference stream specifier
116 int reference_stream_index;
117 int break_non_keyframes;
118 int write_empty;
119
120 int use_rename;
121 char temp_list_filename[1024];
122
123 SegmentListEntry cur_entry;
124 SegmentListEntry *segment_list_entries;
125 SegmentListEntry *segment_list_entries_end;
126 } SegmentContext;
127
128 static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
129 {
130 int needs_quoting = !!str[strcspn(str, "\",\n\r")];
131
132 if (needs_quoting)
133 avio_w8(ctx, '"');
134
135 for (; *str; str++) {
136 if (*str == '"')
137 avio_w8(ctx, '"');
138 avio_w8(ctx, *str);
139 }
140 if (needs_quoting)
141 avio_w8(ctx, '"');
142 }
143
144 static int segment_mux_init(AVFormatContext *s)
145 {
146 SegmentContext *seg = s->priv_data;
147 AVFormatContext *oc;
148 int i;
149 int ret;
150
151 ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
152 if (ret < 0)
153 return ret;
154 oc = seg->avf;
155
156 oc->interrupt_callback = s->interrupt_callback;
157 oc->max_delay = s->max_delay;
158 av_dict_copy(&oc->metadata, s->metadata, 0);
159 oc->opaque = s->opaque;
160 oc->io_close = s->io_close;
161 oc->io_close2 = s->io_close2;
162 oc->io_open = s->io_open;
163 oc->flags = s->flags;
164
165 for (i = 0; i < s->nb_streams; i++) {
166 AVStream *st, *ist = s->streams[i];
167 AVCodecParameters *ipar = ist->codecpar, *opar;
168
169 if (!(st = avformat_new_stream(oc, NULL)))
170 return AVERROR(ENOMEM);
171 ret = ff_stream_encode_params_copy(st, ist);
172 if (ret < 0)
173 return ret;
174 opar = st->codecpar;
175 if (!oc->oformat->codec_tag ||
176 av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
177 av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
178 opar->codec_tag = ipar->codec_tag;
179 } else {
180 opar->codec_tag = 0;
181 }
182 }
183
184 return 0;
185 }
186
187 static int set_segment_filename(AVFormatContext *s)
188 {
189 SegmentContext *seg = s->priv_data;
190 AVFormatContext *oc = seg->avf;
191 size_t size;
192 int ret;
193 char buf[1024];
194 char *new_name;
195
196 if (seg->segment_idx_wrap)
197 seg->segment_idx %= seg->segment_idx_wrap;
198 if (seg->use_strftime) {
199 time_t now0;
200 struct tm *tm, tmpbuf;
201 time(&now0);
202 tm = localtime_r(&now0, &tmpbuf);
203 if (!strftime(buf, sizeof(buf), s->url, tm)) {
204 av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
205 return AVERROR(EINVAL);
206 }
207 } else if (av_get_frame_filename(buf, sizeof(buf),
208 s->url, seg->segment_idx) < 0) {
209 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->url);
210 return AVERROR(EINVAL);
211 }
212 new_name = av_strdup(buf);
213 if (!new_name)
214 return AVERROR(ENOMEM);
215 ff_format_set_url(oc, new_name);
216
217 /* copy modified name in list entry */
218 size = strlen(av_basename(oc->url)) + 1;
219 if (seg->entry_prefix)
220 size += strlen(seg->entry_prefix);
221
222 if ((ret = av_reallocp(&seg->cur_entry.filename, size)) < 0)
223 return ret;
224 snprintf(seg->cur_entry.filename, size, "%s%s",
225 seg->entry_prefix ? seg->entry_prefix : "",
226 av_basename(oc->url));
227
228 return 0;
229 }
230
231 static int segment_start(AVFormatContext *s, int write_header)
232 {
233 SegmentContext *seg = s->priv_data;
234 AVFormatContext *oc = seg->avf;
235 int err = 0;
236
237 if (write_header) {
238 avformat_free_context(oc);
239 seg->avf = NULL;
240 if ((err = segment_mux_init(s)) < 0)
241 return err;
242 oc = seg->avf;
243 }
244
245 seg->segment_idx++;
246 if ((seg->segment_idx_wrap) && (seg->segment_idx % seg->segment_idx_wrap == 0))
247 seg->segment_idx_wrap_nb++;
248
249 if ((err = set_segment_filename(s)) < 0)
250 return err;
251
252 if ((err = s->io_open(s, &oc->pb, oc->url, AVIO_FLAG_WRITE, NULL)) < 0) {
253 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->url);
254 return err;
255 }
256 if (!seg->individual_header_trailer)
257 oc->pb->seekable = 0;
258
259 if (oc->oformat->priv_class && oc->priv_data)
260 av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
261
262 if (write_header) {
263 AVDictionary *options = NULL;
264 av_dict_copy(&options, seg->format_options, 0);
265 av_dict_set(&options, "fflags", "-autobsf", 0);
266 err = avformat_write_header(oc, &options);
267 av_dict_free(&options);
268 if (err < 0)
269 return err;
270 }
271
272 seg->segment_frame_count = 0;
273 return 0;
274 }
275
276 static int segment_list_open(AVFormatContext *s)
277 {
278 SegmentContext *seg = s->priv_data;
279 int ret;
280
281 snprintf(seg->temp_list_filename, sizeof(seg->temp_list_filename), seg->use_rename ? "%s.tmp" : "%s", seg->list);
282 ret = s->io_open(s, &seg->list_pb, seg->temp_list_filename, AVIO_FLAG_WRITE, NULL);
283 if (ret < 0) {
284 av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
285 return ret;
286 }
287
288 if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
289 SegmentListEntry *entry;
290 double max_duration = 0;
291
292 avio_printf(seg->list_pb, "#EXTM3U\n");
293 avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
294 avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
295 avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
296 seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
297
298 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
299 seg->segment_list_entries->index);
300
301 for (entry = seg->segment_list_entries; entry; entry = entry->next)
302 max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
303 avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
304 } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
305 avio_printf(seg->list_pb, "ffconcat version 1.0\n");
306 }
307
308 return ret;
309 }
310
311 static void segment_list_print_entry(AVIOContext *list_ioctx,
312 ListType list_type,
313 const SegmentListEntry *list_entry,
314 void *log_ctx)
315 {
316 switch (list_type) {
317 case LIST_TYPE_FLAT:
318 avio_printf(list_ioctx, "%s\n", list_entry->filename);
319 break;
320 case LIST_TYPE_CSV:
321 case LIST_TYPE_EXT:
322 print_csv_escaped_str(list_ioctx, list_entry->filename);
323 avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
324 break;
325 case LIST_TYPE_M3U8:
326 avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
327 list_entry->end_time - list_entry->start_time, list_entry->filename);
328 break;
329 case LIST_TYPE_FFCONCAT:
330 {
331 char *buf;
332 if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
333 av_log(log_ctx, AV_LOG_WARNING,
334 "Error writing list entry '%s' in list file\n", list_entry->filename);
335 return;
336 }
337 avio_printf(list_ioctx, "file %s\n", buf);
338 av_free(buf);
339 break;
340 }
341 default:
342 av_assert0(!"Invalid list type");
343 }
344 }
345
346 static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
347 {
348 SegmentContext *seg = s->priv_data;
349 AVFormatContext *oc = seg->avf;
350 int ret = 0;
351 AVTimecode tc;
352 AVRational rate;
353 AVDictionaryEntry *tcr;
354 char buf[AV_TIMECODE_STR_SIZE];
355 int i;
356 int err;
357
358 if (!oc || !oc->pb)
359 return AVERROR(EINVAL);
360
361 av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
362 if (write_trailer)
363 ret = av_write_trailer(oc);
364
365 if (ret < 0)
366 av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
367 oc->url);
368
369 if (seg->list) {
370 if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
371 SegmentListEntry *entry = av_mallocz(sizeof(*entry));
372 if (!entry) {
373 ret = AVERROR(ENOMEM);
374 goto end;
375 }
376
377 /* append new element */
378 memcpy(entry, &seg->cur_entry, sizeof(*entry));
379 entry->filename = av_strdup(entry->filename);
380 if (!seg->segment_list_entries)
381 seg->segment_list_entries = seg->segment_list_entries_end = entry;
382 else
383 seg->segment_list_entries_end->next = entry;
384 seg->segment_list_entries_end = entry;
385
386 /* drop first item */
387 if (seg->list_size && seg->segment_count >= seg->list_size) {
388 entry = seg->segment_list_entries;
389 seg->segment_list_entries = seg->segment_list_entries->next;
390 av_freep(&entry->filename);
391 av_freep(&entry);
392 }
393
394 if ((ret = segment_list_open(s)) < 0)
395 goto end;
396 for (entry = seg->segment_list_entries; entry; entry = entry->next)
397 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
398 if (seg->list_type == LIST_TYPE_M3U8 && is_last)
399 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
400 ff_format_io_close(s, &seg->list_pb);
401 if (seg->use_rename)
402 ff_rename(seg->temp_list_filename, seg->list, s);
403 } else {
404 segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
405 avio_flush(seg->list_pb);
406 }
407 }
408
409 av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
410 seg->avf->url, seg->segment_count);
411 seg->segment_count++;
412
413 if (seg->increment_tc) {
414 tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
415 if (tcr) {
416 /* search the first video stream */
417 for (i = 0; i < s->nb_streams; i++) {
418 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
419 rate = s->streams[i]->avg_frame_rate;/* Get fps from the video stream */
420 err = av_timecode_init_from_string(&tc, rate, tcr->value, s);
421 if (err < 0) {
422 av_log(s, AV_LOG_WARNING, "Could not increment global timecode, error occurred during timecode creation.\n");
423 break;
424 }
425 tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(rate));/* increment timecode */
426 av_dict_set(&s->metadata, "timecode",
427 av_timecode_make_string(&tc, buf, 0), 0);
428 break;
429 }
430 }
431 } else {
432 av_log(s, AV_LOG_WARNING, "Could not increment global timecode, no global timecode metadata found.\n");
433 }
434 for (i = 0; i < s->nb_streams; i++) {
435 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
436 char st_buf[AV_TIMECODE_STR_SIZE];
437 AVTimecode st_tc;
438 AVRational st_rate = s->streams[i]->avg_frame_rate;
439 AVDictionaryEntry *st_tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
440 if (st_tcr) {
441 if ((av_timecode_init_from_string(&st_tc, st_rate, st_tcr->value, s) < 0)) {
442 av_log(s, AV_LOG_WARNING, "Could not increment stream %d timecode, error occurred during timecode creation.\n", i);
443 continue;
444 }
445 st_tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(st_rate)); // increment timecode
446 av_dict_set(&s->streams[i]->metadata, "timecode", av_timecode_make_string(&st_tc, st_buf, 0), 0);
447 }
448 }
449 }
450 }
451
452 end:
453 ff_format_io_close(oc, &oc->pb);
454
455 return ret;
456 }
457
458 static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
459 const char *times_str)
460 {
461 char *p;
462 int i, ret = 0;
463 char *times_str1 = av_strdup(times_str);
464 char *saveptr = NULL;
465
466 if (!times_str1)
467 return AVERROR(ENOMEM);
468
469 #define FAIL(err) ret = err; goto end
470
471 *nb_times = 1;
472 for (p = times_str1; *p; p++)
473 if (*p == ',')
474 (*nb_times)++;
475
476 *times = av_malloc_array(*nb_times, sizeof(**times));
477 if (!*times) {
478 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
479 FAIL(AVERROR(ENOMEM));
480 }
481
482 p = times_str1;
483 for (i = 0; i < *nb_times; i++) {
484 int64_t t;
485 char *tstr = av_strtok(p, ",", &saveptr);
486 p = NULL;
487
488 if (!tstr || !tstr[0]) {
489 av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
490 times_str);
491 FAIL(AVERROR(EINVAL));
492 }
493
494 ret = av_parse_time(&t, tstr, 1);
495 if (ret < 0) {
496 av_log(log_ctx, AV_LOG_ERROR,
497 "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
498 FAIL(AVERROR(EINVAL));
499 }
500 (*times)[i] = t;
501
502 /* check on monotonicity */
503 if (i && (*times)[i-1] > (*times)[i]) {
504 av_log(log_ctx, AV_LOG_ERROR,
505 "Specified time %f is smaller than the last time %f\n",
506 (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
507 FAIL(AVERROR(EINVAL));
508 }
509 }
510
511 end:
512 av_free(times_str1);
513 return ret;
514 }
515
516 static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
517 const char *frames_str)
518 {
519 const char *p;
520 int i;
521
522 *nb_frames = 1;
523 for (p = frames_str; *p; p++)
524 if (*p == ',')
525 (*nb_frames)++;
526
527 *frames = av_malloc_array(*nb_frames, sizeof(**frames));
528 if (!*frames) {
529 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
530 return AVERROR(ENOMEM);
531 }
532
533 p = frames_str;
534 for (i = 0; i < *nb_frames; i++) {
535 long int f;
536 char *tailptr;
537
538 if (*p == '\0' || *p == ',') {
539 av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
540 frames_str);
541 return AVERROR(EINVAL);
542 }
543 f = strtol(p, &tailptr, 10);
544 if (*tailptr != '\0' && *tailptr != ',' || f <= 0 || f >= INT_MAX) {
545 av_log(log_ctx, AV_LOG_ERROR,
546 "Invalid argument '%s', must be a positive integer < INT_MAX\n",
547 p);
548 return AVERROR(EINVAL);
549 }
550 if (*tailptr == ',')
551 tailptr++;
552 p = tailptr;
553 (*frames)[i] = f;
554
555 /* check on monotonicity */
556 if (i && (*frames)[i-1] > (*frames)[i]) {
557 av_log(log_ctx, AV_LOG_ERROR,
558 "Specified frame %d is smaller than the last frame %d\n",
559 (*frames)[i], (*frames)[i-1]);
560 return AVERROR(EINVAL);
561 }
562 }
563
564 return 0;
565 }
566
567 static int open_null_ctx(AVIOContext **ctx)
568 {
569 int buf_size = 32768;
570 uint8_t *buf = av_malloc(buf_size);
571 if (!buf)
572 return AVERROR(ENOMEM);
573 *ctx = avio_alloc_context(buf, buf_size, 1, NULL, NULL, NULL, NULL);
574 if (!*ctx) {
575 av_free(buf);
576 return AVERROR(ENOMEM);
577 }
578 return 0;
579 }
580
581 static void close_null_ctxp(AVIOContext **pb)
582 {
583 av_freep(&(*pb)->buffer);
584 avio_context_free(pb);
585 }
586
587 static int select_reference_stream(AVFormatContext *s)
588 {
589 SegmentContext *seg = s->priv_data;
590 int ret, i;
591
592 seg->reference_stream_index = -1;
593 if (!strcmp(seg->reference_stream_specifier, "auto")) {
594 /* select first index of type with highest priority */
595 int type_index_map[AVMEDIA_TYPE_NB];
596 static const enum AVMediaType type_priority_list[] = {
597 AVMEDIA_TYPE_VIDEO,
598 AVMEDIA_TYPE_AUDIO,
599 AVMEDIA_TYPE_SUBTITLE,
600 AVMEDIA_TYPE_DATA,
601 AVMEDIA_TYPE_ATTACHMENT
602 };
603 enum AVMediaType type;
604
605 for (i = 0; i < AVMEDIA_TYPE_NB; i++)
606 type_index_map[i] = -1;
607
608 /* select first index for each type */
609 for (i = 0; i < s->nb_streams; i++) {
610 type = s->streams[i]->codecpar->codec_type;
611 if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
612 /* ignore attached pictures/cover art streams */
613 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
614 type_index_map[type] = i;
615 }
616
617 for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
618 type = type_priority_list[i];
619 if ((seg->reference_stream_index = type_index_map[type]) >= 0)
620 break;
621 }
622 } else {
623 for (i = 0; i < s->nb_streams; i++) {
624 ret = avformat_match_stream_specifier(s, s->streams[i],
625 seg->reference_stream_specifier);
626 if (ret < 0)
627 return ret;
628 if (ret > 0) {
629 seg->reference_stream_index = i;
630 break;
631 }
632 }
633 }
634
635 if (seg->reference_stream_index < 0) {
636 av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
637 seg->reference_stream_specifier);
638 return AVERROR(EINVAL);
639 }
640
641 return 0;
642 }
643
644 static void seg_free(AVFormatContext *s)
645 {
646 SegmentContext *seg = s->priv_data;
647 SegmentListEntry *cur;
648
649 ff_format_io_close(s, &seg->list_pb);
650 if (seg->avf) {
651 if (seg->is_nullctx)
652 close_null_ctxp(&seg->avf->pb);
653 else
654 ff_format_io_close(s, &seg->avf->pb);
655 avformat_free_context(seg->avf);
656 seg->avf = NULL;
657 }
658 av_freep(&seg->times);
659 av_freep(&seg->frames);
660 av_freep(&seg->cur_entry.filename);
661
662 cur = seg->segment_list_entries;
663 while (cur) {
664 SegmentListEntry *next = cur->next;
665 av_freep(&cur->filename);
666 av_free(cur);
667 cur = next;
668 }
669 }
670
671 static int seg_init(AVFormatContext *s)
672 {
673 SegmentContext *seg = s->priv_data;
674 AVFormatContext *oc = seg->avf;
675 AVDictionary *options = NULL;
676 int ret;
677 int i;
678
679 seg->segment_count = 0;
680 if (!seg->write_header_trailer)
681 seg->individual_header_trailer = 0;
682
683 if (seg->header_filename) {
684 seg->write_header_trailer = 1;
685 seg->individual_header_trailer = 0;
686 }
687
688 if (seg->initial_offset > 0) {
689 av_log(s, AV_LOG_WARNING, "NOTE: the option initial_offset is deprecated,"
690 "you can use output_ts_offset instead of it\n");
691 }
692
693 if ((seg->time != 2000000) + !!seg->times_str + !!seg->frames_str > 1) {
694 av_log(s, AV_LOG_ERROR,
695 "segment_time, segment_times, and segment_frames options "
696 "are mutually exclusive, select just one of them\n");
697 return AVERROR(EINVAL);
698 }
699
700 if (seg->times_str) {
701 if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
702 return ret;
703 } else if (seg->frames_str) {
704 if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
705 return ret;
706 } else {
707 if (seg->use_clocktime) {
708 if (seg->time <= 0) {
709 av_log(s, AV_LOG_ERROR, "Invalid negative segment_time with segment_atclocktime option set\n");
710 return AVERROR(EINVAL);
711 }
712 seg->clocktime_offset = seg->time - (seg->clocktime_offset % seg->time);
713 }
714 }
715
716 if (seg->list) {
717 if (seg->list_type == LIST_TYPE_UNDEFINED) {
718 if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
719 else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
720 else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
721 else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
722 else seg->list_type = LIST_TYPE_FLAT;
723 }
724 if (!seg->list_size && seg->list_type != LIST_TYPE_M3U8) {
725 if ((ret = segment_list_open(s)) < 0)
726 return ret;
727 } else {
728 const char *proto = avio_find_protocol_name(seg->list);
729 seg->use_rename = proto && !strcmp(proto, "file");
730 }
731 }
732
733 if (seg->list_type == LIST_TYPE_EXT)
734 av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
735
736 if ((ret = select_reference_stream(s)) < 0)
737 return ret;
738 av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
739 seg->reference_stream_index,
740 av_get_media_type_string(s->streams[seg->reference_stream_index]->codecpar->codec_type));
741
742 seg->oformat = av_guess_format(seg->format, s->url, NULL);
743
744 if (!seg->oformat)
745 return AVERROR_MUXER_NOT_FOUND;
746 if (seg->oformat->flags & AVFMT_NOFILE) {
747 av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
748 seg->oformat->name);
749 return AVERROR(EINVAL);
750 }
751
752 if ((ret = segment_mux_init(s)) < 0)
753 return ret;
754
755 if ((ret = set_segment_filename(s)) < 0)
756 return ret;
757 oc = seg->avf;
758
759 if (seg->write_header_trailer) {
760 if ((ret = s->io_open(s, &oc->pb,
761 seg->header_filename ? seg->header_filename : oc->url,
762 AVIO_FLAG_WRITE, NULL)) < 0) {
763 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->url);
764 return ret;
765 }
766 if (!seg->individual_header_trailer)
767 oc->pb->seekable = 0;
768 } else {
769 if ((ret = open_null_ctx(&oc->pb)) < 0)
770 return ret;
771 seg->is_nullctx = 1;
772 }
773
774 av_dict_copy(&options, seg->format_options, 0);
775 av_dict_set(&options, "fflags", "-autobsf", 0);
776 ret = avformat_init_output(oc, &options);
777 if (av_dict_count(options)) {
778 av_log(s, AV_LOG_ERROR,
779 "Some of the provided format options are not recognized\n");
780 av_dict_free(&options);
781 return AVERROR(EINVAL);
782 }
783 av_dict_free(&options);
784
785 if (ret < 0) {
786 return ret;
787 }
788 seg->segment_frame_count = 0;
789
790 av_assert0(s->nb_streams == oc->nb_streams);
791 if (ret == AVSTREAM_INIT_IN_WRITE_HEADER) {
792 ret = avformat_write_header(oc, NULL);
793 if (ret < 0)
794 return ret;
795 seg->header_written = 1;
796 }
797
798 for (i = 0; i < s->nb_streams; i++) {
799 AVStream *inner_st = oc->streams[i];
800 AVStream *outer_st = s->streams[i];
801 avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
802 }
803
804 if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
805 s->avoid_negative_ts = 1;
806
807 return ret;
808 }
809
810 static int seg_write_header(AVFormatContext *s)
811 {
812 SegmentContext *seg = s->priv_data;
813 AVFormatContext *oc = seg->avf;
814 int ret;
815
816 if (!seg->header_written) {
817 ret = avformat_write_header(oc, NULL);
818 if (ret < 0)
819 return ret;
820 }
821
822 if (!seg->write_header_trailer || seg->header_filename) {
823 if (seg->header_filename) {
824 av_write_frame(oc, NULL);
825 ff_format_io_close(oc, &oc->pb);
826 } else {
827 close_null_ctxp(&oc->pb);
828 seg->is_nullctx = 0;
829 }
830 if ((ret = oc->io_open(oc, &oc->pb, oc->url, AVIO_FLAG_WRITE, NULL)) < 0)
831 return ret;
832 if (!seg->individual_header_trailer)
833 oc->pb->seekable = 0;
834 }
835
836 return 0;
837 }
838
839 static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
840 {
841 SegmentContext *seg = s->priv_data;
842 AVStream *st = s->streams[pkt->stream_index];
843 int64_t end_pts = INT64_MAX, offset;
844 int start_frame = INT_MAX;
845 int ret;
846 struct tm ti;
847 int64_t usecs;
848 int64_t wrapped_val;
849
850 if (!seg->avf || !seg->avf->pb)
851 return AVERROR(EINVAL);
852
853 if (!st->codecpar->extradata_size) {
854 size_t pkt_extradata_size;
855 uint8_t *pkt_extradata = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &pkt_extradata_size);
856 if (pkt_extradata && pkt_extradata_size > 0) {
857 ret = ff_alloc_extradata(st->codecpar, pkt_extradata_size);
858 if (ret < 0) {
859 av_log(s, AV_LOG_WARNING, "Unable to add extradata to stream. Output segments may be invalid.\n");
860 goto calc_times;
861 }
862 memcpy(st->codecpar->extradata, pkt_extradata, pkt_extradata_size);
863 }
864 }
865
866 calc_times:
867 if (seg->times) {
868 end_pts = seg->segment_count < seg->nb_times ?
869 seg->times[seg->segment_count] : INT64_MAX;
870 } else if (seg->frames) {
871 start_frame = seg->segment_count < seg->nb_frames ?
872 seg->frames[seg->segment_count] : INT_MAX;
873 } else {
874 if (seg->use_clocktime) {
875 int64_t avgt = av_gettime();
876 time_t sec = avgt / 1000000;
877 localtime_r(&sec, &ti);
878 usecs = (int64_t)(ti.tm_hour * 3600 + ti.tm_min * 60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
879 wrapped_val = (usecs + seg->clocktime_offset) % seg->time;
880 if (wrapped_val < seg->last_val && wrapped_val < seg->clocktime_wrap_duration)
881 seg->cut_pending = 1;
882 seg->last_val = wrapped_val;
883 } else {
884 end_pts = seg->time * (seg->segment_count + 1);
885 }
886 }
887
888 ff_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
889 pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
890 av_ts2timestr(pkt->duration, &st->time_base),
891 pkt->flags & AV_PKT_FLAG_KEY,
892 pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
893
894 if (pkt->stream_index == seg->reference_stream_index &&
895 (pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
896 (seg->segment_frame_count > 0 || seg->write_empty) &&
897 (seg->cut_pending || seg->frame_count >= start_frame ||
898 (pkt->pts != AV_NOPTS_VALUE &&
899 av_compare_ts(pkt->pts, st->time_base,
900 end_pts - seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
901 /* sanitize end time in case last packet didn't have a defined duration */
902 if (seg->cur_entry.last_duration == 0)
903 seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
904
905 if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
906 goto fail;
907
908 if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
909 goto fail;
910
911 seg->cut_pending = 0;
912 seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
913 seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
914 seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
915 seg->cur_entry.end_time = seg->cur_entry.start_time;
916
917 if (seg->times || (!seg->frames && !seg->use_clocktime) && seg->write_empty)
918 goto calc_times;
919 }
920
921 if (pkt->stream_index == seg->reference_stream_index) {
922 if (pkt->pts != AV_NOPTS_VALUE)
923 seg->cur_entry.end_time =
924 FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
925 seg->cur_entry.last_duration = pkt->duration;
926 }
927
928 if (seg->segment_frame_count == 0) {
929 av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
930 seg->avf->url, pkt->stream_index,
931 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
932 }
933
934 av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
935 pkt->stream_index,
936 av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
937 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
938 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
939
940 /* compute new timestamps */
941 offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
942 AV_TIME_BASE_Q, st->time_base);
943 if (pkt->pts != AV_NOPTS_VALUE)
944 pkt->pts += offset;
945 if (pkt->dts != AV_NOPTS_VALUE)
946 pkt->dts += offset;
947
948 av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
949 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
950 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
951
952 ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s,
953 seg->initial_offset || seg->reset_timestamps || seg->avf->oformat->interleave_packet);
954
955 fail:
956 /* Use st->index here as the packet returned from ff_write_chained()
957 * is blank if interleaving has been used. */
958 if (st->index == seg->reference_stream_index) {
959 seg->frame_count++;
960 seg->segment_frame_count++;
961 }
962
963 return ret;
964 }
965
966 static int seg_write_trailer(struct AVFormatContext *s)
967 {
968 SegmentContext *seg = s->priv_data;
969 AVFormatContext *oc = seg->avf;
970 int ret;
971
972 if (!oc)
973 return 0;
974
975 if (!seg->write_header_trailer) {
976 if ((ret = segment_end(s, 0, 1)) < 0)
977 return ret;
978 if ((ret = open_null_ctx(&oc->pb)) < 0)
979 return ret;
980 seg->is_nullctx = 1;
981 ret = av_write_trailer(oc);
982 } else {
983 ret = segment_end(s, 1, 1);
984 }
985 return ret;
986 }
987
988 static int seg_check_bitstream(AVFormatContext *s, AVStream *st,
989 const AVPacket *pkt)
990 {
991 SegmentContext *seg = s->priv_data;
992 AVFormatContext *oc = seg->avf;
993 if (oc->oformat->check_bitstream) {
994 AVStream *const ost = oc->streams[st->index];
995 int ret = oc->oformat->check_bitstream(oc, ost, pkt);
996 if (ret == 1) {
997 FFStream *const sti = ffstream(st);
998 FFStream *const osti = ffstream(ost);
999 sti->bsfc = osti->bsfc;
1000 osti->bsfc = NULL;
1001 }
1002 return ret;
1003 }
1004 return 1;
1005 }
1006
1007 #define OFFSET(x) offsetof(SegmentContext, x)
1008 #define E AV_OPT_FLAG_ENCODING_PARAM
1009 static const AVOption options[] = {
1010 { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, 0, 0, E },
1011 { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1012 { "segment_format_options", "set list of options for the container format used for the segments", OFFSET(format_options), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, E },
1013 { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1014 { "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1015
1016 { "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"},
1017 { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
1018 { "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"},
1019
1020 { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1021
1022 { "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" },
1023 { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
1024 { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },
1025 { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },
1026 { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
1027 { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1028 { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1029
1030 { "segment_atclocktime", "set segment to be cut at clocktime", OFFSET(use_clocktime), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E},
1031 { "segment_clocktime_offset", "set segment clocktime offset", OFFSET(clocktime_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 86400000000LL, E},
1032 { "segment_clocktime_wrap_duration", "set segment clocktime wrapping duration", OFFSET(clocktime_wrap_duration), AV_OPT_TYPE_DURATION, {.i64 = INT64_MAX}, 0, INT64_MAX, E},
1033 { "segment_time", "set segment duration", OFFSET(time),AV_OPT_TYPE_DURATION, {.i64 = 2000000}, INT64_MIN, INT64_MAX, E },
1034 { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, E },
1035 { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1036 { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1037 { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1038 { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1039 { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1040 { "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 },
1041 { "strftime", "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1042 { "increment_tc", "increment timecode between each segment", OFFSET(increment_tc), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1043 { "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1044
1045 { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1046 { "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 },
1047 { "reset_timestamps", "reset timestamps at the beginning of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1048 { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
1049 { "write_empty_segments", "allow writing empty 'filler' segments", OFFSET(write_empty), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1050 { NULL },
1051 };
1052
1053 static const AVClass seg_class = {
1054 .class_name = "(stream) segment muxer",
1055 .item_name = av_default_item_name,
1056 .option = options,
1057 .version = LIBAVUTIL_VERSION_INT,
1058 };
1059
1060 #if CONFIG_SEGMENT_MUXER
1061 const AVOutputFormat ff_segment_muxer = {
1062 .name = "segment",
1063 .long_name = NULL_IF_CONFIG_SMALL("segment"),
1064 .priv_data_size = sizeof(SegmentContext),
1065 .flags = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
1066 .init = seg_init,
1067 .write_header = seg_write_header,
1068 .write_packet = seg_write_packet,
1069 .write_trailer = seg_write_trailer,
1070 .deinit = seg_free,
1071 .check_bitstream = seg_check_bitstream,
1072 .priv_class = &seg_class,
1073 };
1074 #endif
1075
1076 #if CONFIG_STREAM_SEGMENT_MUXER
1077 const AVOutputFormat ff_stream_segment_muxer = {
1078 .name = "stream_segment,ssegment",
1079 .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
1080 .priv_data_size = sizeof(SegmentContext),
1081 .flags = AVFMT_NOFILE,
1082 .init = seg_init,
1083 .write_header = seg_write_header,
1084 .write_packet = seg_write_packet,
1085 .write_trailer = seg_write_trailer,
1086 .deinit = seg_free,
1087 .check_bitstream = seg_check_bitstream,
1088 .priv_class = &seg_class,
1089 };
1090 #endif
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