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path: root/libavformat/concatdec.c (plain)
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1/*
2 * Copyright (c) 2012 Nicolas George
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 License
8 * 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
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "libavutil/avassert.h"
22#include "libavutil/avstring.h"
23#include "libavutil/intreadwrite.h"
24#include "libavutil/opt.h"
25#include "libavutil/parseutils.h"
26#include "libavutil/timestamp.h"
27#include "avformat.h"
28#include "internal.h"
29#include "url.h"
30
31typedef enum ConcatMatchMode {
32 MATCH_ONE_TO_ONE,
33 MATCH_EXACT_ID,
34} ConcatMatchMode;
35
36typedef struct ConcatStream {
37 AVBitStreamFilterContext *bsf;
38 AVCodecContext *avctx;
39 int out_stream_index;
40} ConcatStream;
41
42typedef struct {
43 char *url;
44 int64_t start_time;
45 int64_t file_start_time;
46 int64_t file_inpoint;
47 int64_t duration;
48 ConcatStream *streams;
49 int64_t inpoint;
50 int64_t outpoint;
51 AVDictionary *metadata;
52 int nb_streams;
53} ConcatFile;
54
55typedef struct {
56 AVClass *class;
57 ConcatFile *files;
58 ConcatFile *cur_file;
59 unsigned nb_files;
60 AVFormatContext *avf;
61 int safe;
62 int seekable;
63 int eof;
64 ConcatMatchMode stream_match_mode;
65 unsigned auto_convert;
66 int segment_time_metadata;
67} ConcatContext;
68
69static int concat_probe(AVProbeData *probe)
70{
71 return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
72 0 : AVPROBE_SCORE_MAX;
73}
74
75static char *get_keyword(uint8_t **cursor)
76{
77 char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
78 *cursor += strcspn(*cursor, SPACE_CHARS);
79 if (**cursor) {
80 *((*cursor)++) = 0;
81 *cursor += strspn(*cursor, SPACE_CHARS);
82 }
83 return ret;
84}
85
86static int safe_filename(const char *f)
87{
88 const char *start = f;
89
90 for (; *f; f++) {
91 /* A-Za-z0-9_- */
92 if (!((unsigned)((*f | 32) - 'a') < 26 ||
93 (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
94 if (f == start)
95 return 0;
96 else if (*f == '/')
97 start = f + 1;
98 else if (*f != '.')
99 return 0;
100 }
101 }
102 return 1;
103}
104
105#define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
106
107static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
108 unsigned *nb_files_alloc)
109{
110 ConcatContext *cat = avf->priv_data;
111 ConcatFile *file;
112 char *url = NULL;
113 const char *proto;
114 size_t url_len, proto_len;
115 int ret;
116
117 if (cat->safe > 0 && !safe_filename(filename)) {
118 av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
119 FAIL(AVERROR(EPERM));
120 }
121
122 proto = avio_find_protocol_name(filename);
123 proto_len = proto ? strlen(proto) : 0;
124 if (!memcmp(filename, proto, proto_len) &&
125 (filename[proto_len] == ':' || filename[proto_len] == ',')) {
126 url = filename;
127 filename = NULL;
128 } else {
129 url_len = strlen(avf->filename) + strlen(filename) + 16;
130 if (!(url = av_malloc(url_len)))
131 FAIL(AVERROR(ENOMEM));
132 ff_make_absolute_url(url, url_len, avf->filename, filename);
133 av_freep(&filename);
134 }
135
136 if (cat->nb_files >= *nb_files_alloc) {
137 size_t n = FFMAX(*nb_files_alloc * 2, 16);
138 ConcatFile *new_files;
139 if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
140 !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
141 FAIL(AVERROR(ENOMEM));
142 cat->files = new_files;
143 *nb_files_alloc = n;
144 }
145
146 file = &cat->files[cat->nb_files++];
147 memset(file, 0, sizeof(*file));
148 *rfile = file;
149
150 file->url = url;
151 file->start_time = AV_NOPTS_VALUE;
152 file->duration = AV_NOPTS_VALUE;
153 file->inpoint = AV_NOPTS_VALUE;
154 file->outpoint = AV_NOPTS_VALUE;
155
156 return 0;
157
158fail:
159 av_free(url);
160 av_free(filename);
161 return ret;
162}
163
164static int copy_stream_props(AVStream *st, AVStream *source_st)
165{
166 int ret;
167
168 if (st->codecpar->codec_id || !source_st->codecpar->codec_id) {
169 if (st->codecpar->extradata_size < source_st->codecpar->extradata_size) {
170 if (st->codecpar->extradata) {
171 av_freep(&st->codecpar->extradata);
172 st->codecpar->extradata_size = 0;
173 }
174 ret = ff_alloc_extradata(st->codecpar,
175 source_st->codecpar->extradata_size);
176 if (ret < 0)
177 return ret;
178 }
179 memcpy(st->codecpar->extradata, source_st->codecpar->extradata,
180 source_st->codecpar->extradata_size);
181 return 0;
182 }
183 if ((ret = avcodec_parameters_copy(st->codecpar, source_st->codecpar)) < 0)
184 return ret;
185 st->r_frame_rate = source_st->r_frame_rate;
186 st->avg_frame_rate = source_st->avg_frame_rate;
187 st->time_base = source_st->time_base;
188 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
189
190 av_dict_copy(&st->metadata, source_st->metadata, 0);
191 return 0;
192}
193
194static int detect_stream_specific(AVFormatContext *avf, int idx)
195{
196 ConcatContext *cat = avf->priv_data;
197 AVStream *st = cat->avf->streams[idx];
198 ConcatStream *cs = &cat->cur_file->streams[idx];
199 AVBitStreamFilterContext *bsf;
200 int ret;
201
202 if (cat->auto_convert && st->codecpar->codec_id == AV_CODEC_ID_H264) {
203 if (!st->codecpar->extradata_size ||
204 (st->codecpar->extradata_size >= 3 && AV_RB24(st->codecpar->extradata) == 1) ||
205 (st->codecpar->extradata_size >= 4 && AV_RB32(st->codecpar->extradata) == 1))
206 return 0;
207 av_log(cat->avf, AV_LOG_INFO,
208 "Auto-inserting h264_mp4toannexb bitstream filter\n");
209 if (!(bsf = av_bitstream_filter_init("h264_mp4toannexb"))) {
210 av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter "
211 "required for H.264 streams\n");
212 return AVERROR_BSF_NOT_FOUND;
213 }
214 cs->bsf = bsf;
215
216 cs->avctx = avcodec_alloc_context3(NULL);
217 if (!cs->avctx)
218 return AVERROR(ENOMEM);
219
220 /* This really should be part of the bsf work.
221 Note: input bitstream filtering will not work with bsf that
222 create extradata from the first packet. */
223 av_freep(&st->codecpar->extradata);
224 st->codecpar->extradata_size = 0;
225
226 ret = avcodec_parameters_to_context(cs->avctx, st->codecpar);
227 if (ret < 0) {
228 avcodec_free_context(&cs->avctx);
229 return ret;
230 }
231
232 }
233 return 0;
234}
235
236static int match_streams_one_to_one(AVFormatContext *avf)
237{
238 ConcatContext *cat = avf->priv_data;
239 AVStream *st;
240 int i, ret;
241
242 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
243 if (i < avf->nb_streams) {
244 st = avf->streams[i];
245 } else {
246 if (!(st = avformat_new_stream(avf, NULL)))
247 return AVERROR(ENOMEM);
248 }
249 if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0)
250 return ret;
251 cat->cur_file->streams[i].out_stream_index = i;
252 }
253 return 0;
254}
255
256static int match_streams_exact_id(AVFormatContext *avf)
257{
258 ConcatContext *cat = avf->priv_data;
259 AVStream *st;
260 int i, j, ret;
261
262 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
263 st = cat->avf->streams[i];
264 for (j = 0; j < avf->nb_streams; j++) {
265 if (avf->streams[j]->id == st->id) {
266 av_log(avf, AV_LOG_VERBOSE,
267 "Match slave stream #%d with stream #%d id 0x%x\n",
268 i, j, st->id);
269 if ((ret = copy_stream_props(avf->streams[j], st)) < 0)
270 return ret;
271 cat->cur_file->streams[i].out_stream_index = j;
272 }
273 }
274 }
275 return 0;
276}
277
278static int match_streams(AVFormatContext *avf)
279{
280 ConcatContext *cat = avf->priv_data;
281 ConcatStream *map;
282 int i, ret;
283
284 if (cat->cur_file->nb_streams >= cat->avf->nb_streams)
285 return 0;
286 map = av_realloc(cat->cur_file->streams,
287 cat->avf->nb_streams * sizeof(*map));
288 if (!map)
289 return AVERROR(ENOMEM);
290 cat->cur_file->streams = map;
291 memset(map + cat->cur_file->nb_streams, 0,
292 (cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map));
293
294 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
295 map[i].out_stream_index = -1;
296 switch (cat->stream_match_mode) {
297 case MATCH_ONE_TO_ONE:
298 ret = match_streams_one_to_one(avf);
299 break;
300 case MATCH_EXACT_ID:
301 ret = match_streams_exact_id(avf);
302 break;
303 default:
304 ret = AVERROR_BUG;
305 }
306 if (ret < 0)
307 return ret;
308 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
309 if ((ret = detect_stream_specific(avf, i)) < 0)
310 return ret;
311 cat->cur_file->nb_streams = cat->avf->nb_streams;
312 return 0;
313}
314
315static int open_file(AVFormatContext *avf, unsigned fileno)
316{
317 ConcatContext *cat = avf->priv_data;
318 ConcatFile *file = &cat->files[fileno];
319 int ret;
320
321 if (cat->avf)
322 avformat_close_input(&cat->avf);
323
324 cat->avf = avformat_alloc_context();
325 if (!cat->avf)
326 return AVERROR(ENOMEM);
327
328 cat->avf->flags |= avf->flags;
329 cat->avf->interrupt_callback = avf->interrupt_callback;
330
331 if ((ret = ff_copy_whiteblacklists(cat->avf, avf)) < 0)
332 return ret;
333
334 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
335 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
336 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
337 avformat_close_input(&cat->avf);
338 return ret;
339 }
340 cat->cur_file = file;
341 if (file->start_time == AV_NOPTS_VALUE)
342 file->start_time = !fileno ? 0 :
343 cat->files[fileno - 1].start_time +
344 cat->files[fileno - 1].duration;
345 file->file_start_time = (cat->avf->start_time == AV_NOPTS_VALUE) ? 0 : cat->avf->start_time;
346 file->file_inpoint = (file->inpoint == AV_NOPTS_VALUE) ? file->file_start_time : file->inpoint;
347 if (file->duration == AV_NOPTS_VALUE && file->outpoint != AV_NOPTS_VALUE)
348 file->duration = file->outpoint - file->file_inpoint;
349
350 if (cat->segment_time_metadata) {
351 av_dict_set_int(&file->metadata, "lavf.concatdec.start_time", file->start_time, 0);
352 if (file->duration != AV_NOPTS_VALUE)
353 av_dict_set_int(&file->metadata, "lavf.concatdec.duration", file->duration, 0);
354 }
355
356 if ((ret = match_streams(avf)) < 0)
357 return ret;
358 if (file->inpoint != AV_NOPTS_VALUE) {
359 if ((ret = avformat_seek_file(cat->avf, -1, INT64_MIN, file->inpoint, file->inpoint, 0)) < 0)
360 return ret;
361 }
362 return 0;
363}
364
365static int concat_read_close(AVFormatContext *avf)
366{
367 ConcatContext *cat = avf->priv_data;
368 unsigned i, j;
369
370 for (i = 0; i < cat->nb_files; i++) {
371 av_freep(&cat->files[i].url);
372 for (j = 0; j < cat->files[i].nb_streams; j++) {
373 if (cat->files[i].streams[j].avctx)
374 avcodec_free_context(&cat->files[i].streams[j].avctx);
375 if (cat->files[i].streams[j].bsf)
376 av_bitstream_filter_close(cat->files[i].streams[j].bsf);
377 }
378 av_freep(&cat->files[i].streams);
379 av_dict_free(&cat->files[i].metadata);
380 }
381 if (cat->avf)
382 avformat_close_input(&cat->avf);
383 av_freep(&cat->files);
384 return 0;
385}
386
387static int concat_read_header(AVFormatContext *avf)
388{
389 ConcatContext *cat = avf->priv_data;
390 uint8_t buf[4096];
391 uint8_t *cursor, *keyword;
392 int ret, line = 0, i;
393 unsigned nb_files_alloc = 0;
394 ConcatFile *file = NULL;
395 int64_t time = 0;
396
397 while (1) {
398 if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
399 break;
400 line++;
401 cursor = buf;
402 keyword = get_keyword(&cursor);
403 if (!*keyword || *keyword == '#')
404 continue;
405
406 if (!strcmp(keyword, "file")) {
407 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
408 if (!filename) {
409 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
410 FAIL(AVERROR_INVALIDDATA);
411 }
412 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
413 goto fail;
414 } else if (!strcmp(keyword, "duration") || !strcmp(keyword, "inpoint") || !strcmp(keyword, "outpoint")) {
415 char *dur_str = get_keyword(&cursor);
416 int64_t dur;
417 if (!file) {
418 av_log(avf, AV_LOG_ERROR, "Line %d: %s without file\n",
419 line, keyword);
420 FAIL(AVERROR_INVALIDDATA);
421 }
422 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
423 av_log(avf, AV_LOG_ERROR, "Line %d: invalid %s '%s'\n",
424 line, keyword, dur_str);
425 goto fail;
426 }
427 if (!strcmp(keyword, "duration"))
428 file->duration = dur;
429 else if (!strcmp(keyword, "inpoint"))
430 file->inpoint = dur;
431 else if (!strcmp(keyword, "outpoint"))
432 file->outpoint = dur;
433 } else if (!strcmp(keyword, "file_packet_metadata")) {
434 char *metadata;
435 if (!file) {
436 av_log(avf, AV_LOG_ERROR, "Line %d: %s without file\n",
437 line, keyword);
438 FAIL(AVERROR_INVALIDDATA);
439 }
440 metadata = av_get_token((const char **)&cursor, SPACE_CHARS);
441 if (!metadata) {
442 av_log(avf, AV_LOG_ERROR, "Line %d: packet metadata required\n", line);
443 FAIL(AVERROR_INVALIDDATA);
444 }
445 if ((ret = av_dict_parse_string(&file->metadata, metadata, "=", "", 0)) < 0) {
446 av_log(avf, AV_LOG_ERROR, "Line %d: failed to parse metadata string\n", line);
447 av_freep(&metadata);
448 FAIL(AVERROR_INVALIDDATA);
449 }
450 av_freep(&metadata);
451 } else if (!strcmp(keyword, "stream")) {
452 if (!avformat_new_stream(avf, NULL))
453 FAIL(AVERROR(ENOMEM));
454 } else if (!strcmp(keyword, "exact_stream_id")) {
455 if (!avf->nb_streams) {
456 av_log(avf, AV_LOG_ERROR, "Line %d: exact_stream_id without stream\n",
457 line);
458 FAIL(AVERROR_INVALIDDATA);
459 }
460 avf->streams[avf->nb_streams - 1]->id =
461 strtol(get_keyword(&cursor), NULL, 0);
462 } else if (!strcmp(keyword, "ffconcat")) {
463 char *ver_kw = get_keyword(&cursor);
464 char *ver_val = get_keyword(&cursor);
465 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
466 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
467 FAIL(AVERROR_INVALIDDATA);
468 }
469 if (cat->safe < 0)
470 cat->safe = 1;
471 } else {
472 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
473 line, keyword);
474 FAIL(AVERROR_INVALIDDATA);
475 }
476 }
477 if (ret < 0)
478 goto fail;
479 if (!cat->nb_files)
480 FAIL(AVERROR_INVALIDDATA);
481
482 for (i = 0; i < cat->nb_files; i++) {
483 if (cat->files[i].start_time == AV_NOPTS_VALUE)
484 cat->files[i].start_time = time;
485 else
486 time = cat->files[i].start_time;
487 if (cat->files[i].duration == AV_NOPTS_VALUE) {
488 if (cat->files[i].inpoint == AV_NOPTS_VALUE || cat->files[i].outpoint == AV_NOPTS_VALUE)
489 break;
490 cat->files[i].duration = cat->files[i].outpoint - cat->files[i].inpoint;
491 }
492 time += cat->files[i].duration;
493 }
494 if (i == cat->nb_files) {
495 avf->duration = time;
496 cat->seekable = 1;
497 }
498
499 cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
500 MATCH_ONE_TO_ONE;
501 if ((ret = open_file(avf, 0)) < 0)
502 goto fail;
503 return 0;
504
505fail:
506 concat_read_close(avf);
507 return ret;
508}
509
510static int open_next_file(AVFormatContext *avf)
511{
512 ConcatContext *cat = avf->priv_data;
513 unsigned fileno = cat->cur_file - cat->files;
514
515 if (cat->cur_file->duration == AV_NOPTS_VALUE)
516 cat->cur_file->duration = cat->avf->duration - (cat->cur_file->file_inpoint - cat->cur_file->file_start_time);
517
518 if (++fileno >= cat->nb_files) {
519 cat->eof = 1;
520 return AVERROR_EOF;
521 }
522 return open_file(avf, fileno);
523}
524
525static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt)
526{
527 AVStream *st = avf->streams[cs->out_stream_index];
528 AVBitStreamFilterContext *bsf;
529 AVPacket pkt2;
530 int ret;
531
532 av_assert0(cs->out_stream_index >= 0);
533 for (bsf = cs->bsf; bsf; bsf = bsf->next) {
534 pkt2 = *pkt;
535
536 ret = av_bitstream_filter_filter(bsf, cs->avctx, NULL,
537 &pkt2.data, &pkt2.size,
538 pkt->data, pkt->size,
539 !!(pkt->flags & AV_PKT_FLAG_KEY));
540 if (ret < 0) {
541 av_packet_unref(pkt);
542 return ret;
543 }
544
545 if (cs->avctx->extradata_size > st->codecpar->extradata_size) {
546 int eret;
547 if (st->codecpar->extradata)
548 av_freep(&st->codecpar->extradata);
549
550 eret = ff_alloc_extradata(st->codecpar, cs->avctx->extradata_size);
551 if (eret < 0) {
552 av_packet_unref(pkt);
553 return AVERROR(ENOMEM);
554 }
555 st->codecpar->extradata_size = cs->avctx->extradata_size;
556 memcpy(st->codecpar->extradata, cs->avctx->extradata, cs->avctx->extradata_size);
557 }
558
559 av_assert0(pkt2.buf);
560 if (ret == 0 && pkt2.data != pkt->data) {
561 if ((ret = av_copy_packet(&pkt2, pkt)) < 0) {
562 av_free(pkt2.data);
563 return ret;
564 }
565 ret = 1;
566 }
567 if (ret > 0) {
568 av_packet_unref(pkt);
569 pkt2.buf = av_buffer_create(pkt2.data, pkt2.size,
570 av_buffer_default_free, NULL, 0);
571 if (!pkt2.buf) {
572 av_free(pkt2.data);
573 return AVERROR(ENOMEM);
574 }
575 }
576 *pkt = pkt2;
577 }
578 return 0;
579}
580
581/* Returns true if the packet dts is greater or equal to the specified outpoint. */
582static int packet_after_outpoint(ConcatContext *cat, AVPacket *pkt)
583{
584 if (cat->cur_file->outpoint != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE) {
585 return av_compare_ts(pkt->dts, cat->avf->streams[pkt->stream_index]->time_base,
586 cat->cur_file->outpoint, AV_TIME_BASE_Q) >= 0;
587 }
588 return 0;
589}
590
591static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
592{
593 ConcatContext *cat = avf->priv_data;
594 int ret;
595 int64_t delta;
596 ConcatStream *cs;
597 AVStream *st;
598
599 if (cat->eof)
600 return AVERROR_EOF;
601
602 if (!cat->avf)
603 return AVERROR(EIO);
604
605 while (1) {
606 ret = av_read_frame(cat->avf, pkt);
607 if (ret == AVERROR_EOF) {
608 if ((ret = open_next_file(avf)) < 0)
609 return ret;
610 continue;
611 }
612 if (ret < 0)
613 return ret;
614 if ((ret = match_streams(avf)) < 0) {
615 av_packet_unref(pkt);
616 return ret;
617 }
618 if (packet_after_outpoint(cat, pkt)) {
619 av_packet_unref(pkt);
620 if ((ret = open_next_file(avf)) < 0)
621 return ret;
622 continue;
623 }
624 cs = &cat->cur_file->streams[pkt->stream_index];
625 if (cs->out_stream_index < 0) {
626 av_packet_unref(pkt);
627 continue;
628 }
629 pkt->stream_index = cs->out_stream_index;
630 break;
631 }
632 if ((ret = filter_packet(avf, cs, pkt)))
633 return ret;
634
635 st = cat->avf->streams[pkt->stream_index];
636 av_log(avf, AV_LOG_DEBUG, "file:%d stream:%d pts:%s pts_time:%s dts:%s dts_time:%s",
637 (unsigned)(cat->cur_file - cat->files), pkt->stream_index,
638 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
639 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
640
641 delta = av_rescale_q(cat->cur_file->start_time - cat->cur_file->file_inpoint,
642 AV_TIME_BASE_Q,
643 cat->avf->streams[pkt->stream_index]->time_base);
644 if (pkt->pts != AV_NOPTS_VALUE)
645 pkt->pts += delta;
646 if (pkt->dts != AV_NOPTS_VALUE)
647 pkt->dts += delta;
648 av_log(avf, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
649 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
650 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
651 if (cat->cur_file->metadata) {
652 uint8_t* metadata;
653 int metadata_len;
654 char* packed_metadata = av_packet_pack_dictionary(cat->cur_file->metadata, &metadata_len);
655 if (!packed_metadata)
656 return AVERROR(ENOMEM);
657 if (!(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA, metadata_len))) {
658 av_freep(&packed_metadata);
659 return AVERROR(ENOMEM);
660 }
661 memcpy(metadata, packed_metadata, metadata_len);
662 av_freep(&packed_metadata);
663 }
664 return ret;
665}
666
667static void rescale_interval(AVRational tb_in, AVRational tb_out,
668 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
669{
670 *ts = av_rescale_q (* ts, tb_in, tb_out);
671 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
672 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
673 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
674 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
675}
676
677static int try_seek(AVFormatContext *avf, int stream,
678 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
679{
680 ConcatContext *cat = avf->priv_data;
681 int64_t t0 = cat->cur_file->start_time - cat->cur_file->file_inpoint;
682
683 ts -= t0;
684 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
685 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
686 if (stream >= 0) {
687 if (stream >= cat->avf->nb_streams)
688 return AVERROR(EIO);
689 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
690 &min_ts, &ts, &max_ts);
691 }
692 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
693}
694
695static int real_seek(AVFormatContext *avf, int stream,
696 int64_t min_ts, int64_t ts, int64_t max_ts, int flags, AVFormatContext *cur_avf)
697{
698 ConcatContext *cat = avf->priv_data;
699 int ret, left, right;
700
701 if (stream >= 0) {
702 if (stream >= avf->nb_streams)
703 return AVERROR(EINVAL);
704 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
705 &min_ts, &ts, &max_ts);
706 }
707
708 left = 0;
709 right = cat->nb_files;
710 while (right - left > 1) {
711 int mid = (left + right) / 2;
712 if (ts < cat->files[mid].start_time)
713 right = mid;
714 else
715 left = mid;
716 }
717
718 if (cat->cur_file != &cat->files[left]) {
719 if ((ret = open_file(avf, left)) < 0)
720 return ret;
721 } else {
722 cat->avf = cur_avf;
723 }
724
725 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
726 if (ret < 0 &&
727 left < cat->nb_files - 1 &&
728 cat->files[left + 1].start_time < max_ts) {
729 if (cat->cur_file == &cat->files[left])
730 cat->avf = NULL;
731 if ((ret = open_file(avf, left + 1)) < 0)
732 return ret;
733 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
734 }
735 return ret;
736}
737
738static int concat_seek(AVFormatContext *avf, int stream,
739 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
740{
741 ConcatContext *cat = avf->priv_data;
742 ConcatFile *cur_file_saved = cat->cur_file;
743 AVFormatContext *cur_avf_saved = cat->avf;
744 int ret;
745
746 if (!cat->seekable)
747 return AVERROR(ESPIPE); /* XXX: can we use it? */
748 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
749 return AVERROR(ENOSYS);
750 cat->avf = NULL;
751 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags, cur_avf_saved)) < 0) {
752 if (cat->cur_file != cur_file_saved) {
753 if (cat->avf)
754 avformat_close_input(&cat->avf);
755 }
756 cat->avf = cur_avf_saved;
757 cat->cur_file = cur_file_saved;
758 } else {
759 if (cat->cur_file != cur_file_saved) {
760 avformat_close_input(&cur_avf_saved);
761 }
762 cat->eof = 0;
763 }
764 return ret;
765}
766
767#define OFFSET(x) offsetof(ConcatContext, x)
768#define DEC AV_OPT_FLAG_DECODING_PARAM
769
770static const AVOption options[] = {
771 { "safe", "enable safe mode",
772 OFFSET(safe), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, DEC },
773 { "auto_convert", "automatically convert bitstream format",
774 OFFSET(auto_convert), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, DEC },
775 { "segment_time_metadata", "output file segment start time and duration as packet metadata",
776 OFFSET(segment_time_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
777 { NULL }
778};
779
780static const AVClass concat_class = {
781 .class_name = "concat demuxer",
782 .item_name = av_default_item_name,
783 .option = options,
784 .version = LIBAVUTIL_VERSION_INT,
785};
786
787
788AVInputFormat ff_concat_demuxer = {
789 .name = "concat",
790 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
791 .priv_data_size = sizeof(ConcatContext),
792 .read_probe = concat_probe,
793 .read_header = concat_read_header,
794 .read_packet = concat_read_packet,
795 .read_close = concat_read_close,
796 .read_seek2 = concat_seek,
797 .priv_class = &concat_class,
798};
799
generated by cgit at 2024-05-17 06:58:35 (GMT)