2 * Copyright (c) 2012 Nicolas George
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/avassert.h"
22 #include "libavutil/avstring.h"
23 #include "libavutil/bprint.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/parseutils.h"
27 #include "libavutil/timestamp.h"
32 typedef enum ConcatMatchMode {
37 typedef struct ConcatStream {
45 int64_t file_start_time;
48 int64_t user_duration;
50 ConcatStream *streams;
53 AVDictionary *metadata;
66 ConcatMatchMode stream_match_mode;
67 unsigned auto_convert;
68 int segment_time_metadata;
71 static int concat_probe(AVProbeData *probe)
73 return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
74 0 : AVPROBE_SCORE_MAX;
77 static char *get_keyword(uint8_t **cursor)
79 char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
80 *cursor += strcspn(*cursor, SPACE_CHARS);
83 *cursor += strspn(*cursor, SPACE_CHARS);
88 static int safe_filename(const char *f)
90 const char *start = f;
94 if (!((unsigned)((*f | 32) - 'a') < 26 ||
95 (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
107 #define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
109 static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
110 unsigned *nb_files_alloc)
112 ConcatContext *cat = avf->priv_data;
116 size_t url_len, proto_len;
119 if (cat->safe > 0 && !safe_filename(filename)) {
120 av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
121 FAIL(AVERROR(EPERM));
124 proto = avio_find_protocol_name(filename);
125 proto_len = proto ? strlen(proto) : 0;
126 if (proto && !memcmp(filename, proto, proto_len) &&
127 (filename[proto_len] == ':' || filename[proto_len] == ',')) {
131 url_len = strlen(avf->url) + strlen(filename) + 16;
132 if (!(url = av_malloc(url_len)))
133 FAIL(AVERROR(ENOMEM));
134 ff_make_absolute_url(url, url_len, avf->url, filename);
138 if (cat->nb_files >= *nb_files_alloc) {
139 size_t n = FFMAX(*nb_files_alloc * 2, 16);
140 ConcatFile *new_files;
141 if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
142 !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
143 FAIL(AVERROR(ENOMEM));
144 cat->files = new_files;
148 file = &cat->files[cat->nb_files++];
149 memset(file, 0, sizeof(*file));
153 file->start_time = AV_NOPTS_VALUE;
154 file->duration = AV_NOPTS_VALUE;
155 file->next_dts = AV_NOPTS_VALUE;
156 file->inpoint = AV_NOPTS_VALUE;
157 file->outpoint = AV_NOPTS_VALUE;
158 file->user_duration = AV_NOPTS_VALUE;
168 static int copy_stream_props(AVStream *st, AVStream *source_st)
172 if (st->codecpar->codec_id || !source_st->codecpar->codec_id) {
173 if (st->codecpar->extradata_size < source_st->codecpar->extradata_size) {
174 if (st->codecpar->extradata) {
175 av_freep(&st->codecpar->extradata);
176 st->codecpar->extradata_size = 0;
178 ret = ff_alloc_extradata(st->codecpar,
179 source_st->codecpar->extradata_size);
183 memcpy(st->codecpar->extradata, source_st->codecpar->extradata,
184 source_st->codecpar->extradata_size);
187 if ((ret = avcodec_parameters_copy(st->codecpar, source_st->codecpar)) < 0)
189 st->r_frame_rate = source_st->r_frame_rate;
190 st->avg_frame_rate = source_st->avg_frame_rate;
191 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
192 avpriv_set_pts_info(st, 64, source_st->time_base.num, source_st->time_base.den);
194 av_dict_copy(&st->metadata, source_st->metadata, 0);
198 static int detect_stream_specific(AVFormatContext *avf, int idx)
200 ConcatContext *cat = avf->priv_data;
201 AVStream *st = cat->avf->streams[idx];
202 ConcatStream *cs = &cat->cur_file->streams[idx];
203 const AVBitStreamFilter *filter;
207 if (cat->auto_convert && st->codecpar->codec_id == AV_CODEC_ID_H264) {
208 if (!st->codecpar->extradata_size ||
209 (st->codecpar->extradata_size >= 3 && AV_RB24(st->codecpar->extradata) == 1) ||
210 (st->codecpar->extradata_size >= 4 && AV_RB32(st->codecpar->extradata) == 1))
212 av_log(cat->avf, AV_LOG_INFO,
213 "Auto-inserting h264_mp4toannexb bitstream filter\n");
214 filter = av_bsf_get_by_name("h264_mp4toannexb");
216 av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter "
217 "required for H.264 streams\n");
218 return AVERROR_BSF_NOT_FOUND;
220 ret = av_bsf_alloc(filter, &bsf);
225 ret = avcodec_parameters_copy(bsf->par_in, st->codecpar);
229 ret = av_bsf_init(bsf);
233 ret = avcodec_parameters_copy(st->codecpar, bsf->par_out);
240 static int match_streams_one_to_one(AVFormatContext *avf)
242 ConcatContext *cat = avf->priv_data;
246 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
247 if (i < avf->nb_streams) {
248 st = avf->streams[i];
250 if (!(st = avformat_new_stream(avf, NULL)))
251 return AVERROR(ENOMEM);
253 if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0)
255 cat->cur_file->streams[i].out_stream_index = i;
260 static int match_streams_exact_id(AVFormatContext *avf)
262 ConcatContext *cat = avf->priv_data;
266 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
267 st = cat->avf->streams[i];
268 for (j = 0; j < avf->nb_streams; j++) {
269 if (avf->streams[j]->id == st->id) {
270 av_log(avf, AV_LOG_VERBOSE,
271 "Match slave stream #%d with stream #%d id 0x%x\n",
273 if ((ret = copy_stream_props(avf->streams[j], st)) < 0)
275 cat->cur_file->streams[i].out_stream_index = j;
282 static int match_streams(AVFormatContext *avf)
284 ConcatContext *cat = avf->priv_data;
288 if (cat->cur_file->nb_streams >= cat->avf->nb_streams)
290 map = av_realloc(cat->cur_file->streams,
291 cat->avf->nb_streams * sizeof(*map));
293 return AVERROR(ENOMEM);
294 cat->cur_file->streams = map;
295 memset(map + cat->cur_file->nb_streams, 0,
296 (cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map));
298 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
299 map[i].out_stream_index = -1;
300 if ((ret = detect_stream_specific(avf, i)) < 0)
303 switch (cat->stream_match_mode) {
304 case MATCH_ONE_TO_ONE:
305 ret = match_streams_one_to_one(avf);
308 ret = match_streams_exact_id(avf);
315 cat->cur_file->nb_streams = cat->avf->nb_streams;
319 static int64_t get_best_effort_duration(ConcatFile *file, AVFormatContext *avf)
321 if (file->user_duration != AV_NOPTS_VALUE)
322 return file->user_duration;
323 if (file->outpoint != AV_NOPTS_VALUE)
324 return file->outpoint - file->file_inpoint;
325 if (avf->duration > 0)
326 return avf->duration - (file->file_inpoint - file->file_start_time);
327 if (file->next_dts != AV_NOPTS_VALUE)
328 return file->next_dts - file->file_inpoint;
329 return AV_NOPTS_VALUE;
332 static int open_file(AVFormatContext *avf, unsigned fileno)
334 ConcatContext *cat = avf->priv_data;
335 ConcatFile *file = &cat->files[fileno];
339 avformat_close_input(&cat->avf);
341 cat->avf = avformat_alloc_context();
343 return AVERROR(ENOMEM);
345 cat->avf->flags |= avf->flags & ~AVFMT_FLAG_CUSTOM_IO;
346 cat->avf->interrupt_callback = avf->interrupt_callback;
348 if ((ret = ff_copy_whiteblacklists(cat->avf, avf)) < 0)
351 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
352 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
353 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
354 avformat_close_input(&cat->avf);
357 cat->cur_file = file;
358 file->start_time = !fileno ? 0 :
359 cat->files[fileno - 1].start_time +
360 cat->files[fileno - 1].duration;
361 file->file_start_time = (cat->avf->start_time == AV_NOPTS_VALUE) ? 0 : cat->avf->start_time;
362 file->file_inpoint = (file->inpoint == AV_NOPTS_VALUE) ? file->file_start_time : file->inpoint;
363 file->duration = get_best_effort_duration(file, cat->avf);
365 if (cat->segment_time_metadata) {
366 av_dict_set_int(&file->metadata, "lavf.concatdec.start_time", file->start_time, 0);
367 if (file->duration != AV_NOPTS_VALUE)
368 av_dict_set_int(&file->metadata, "lavf.concatdec.duration", file->duration, 0);
371 if ((ret = match_streams(avf)) < 0)
373 if (file->inpoint != AV_NOPTS_VALUE) {
374 if ((ret = avformat_seek_file(cat->avf, -1, INT64_MIN, file->inpoint, file->inpoint, 0)) < 0)
380 static int concat_read_close(AVFormatContext *avf)
382 ConcatContext *cat = avf->priv_data;
385 for (i = 0; i < cat->nb_files; i++) {
386 av_freep(&cat->files[i].url);
387 for (j = 0; j < cat->files[i].nb_streams; j++) {
388 if (cat->files[i].streams[j].bsf)
389 av_bsf_free(&cat->files[i].streams[j].bsf);
391 av_freep(&cat->files[i].streams);
392 av_dict_free(&cat->files[i].metadata);
395 avformat_close_input(&cat->avf);
396 av_freep(&cat->files);
400 static int concat_read_header(AVFormatContext *avf)
402 ConcatContext *cat = avf->priv_data;
404 uint8_t *cursor, *keyword;
406 unsigned nb_files_alloc = 0;
407 ConcatFile *file = NULL;
408 int64_t ret, time = 0;
410 av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
412 while ((ret = ff_read_line_to_bprint_overwrite(avf->pb, &bp)) >= 0) {
415 keyword = get_keyword(&cursor);
416 if (!*keyword || *keyword == '#')
419 if (!strcmp(keyword, "file")) {
420 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
422 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
423 FAIL(AVERROR_INVALIDDATA);
425 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
427 } else if (!strcmp(keyword, "duration") || !strcmp(keyword, "inpoint") || !strcmp(keyword, "outpoint")) {
428 char *dur_str = get_keyword(&cursor);
431 av_log(avf, AV_LOG_ERROR, "Line %d: %s without file\n",
433 FAIL(AVERROR_INVALIDDATA);
435 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
436 av_log(avf, AV_LOG_ERROR, "Line %d: invalid %s '%s'\n",
437 line, keyword, dur_str);
440 if (!strcmp(keyword, "duration"))
441 file->user_duration = dur;
442 else if (!strcmp(keyword, "inpoint"))
444 else if (!strcmp(keyword, "outpoint"))
445 file->outpoint = dur;
446 } else if (!strcmp(keyword, "file_packet_metadata")) {
449 av_log(avf, AV_LOG_ERROR, "Line %d: %s without file\n",
451 FAIL(AVERROR_INVALIDDATA);
453 metadata = av_get_token((const char **)&cursor, SPACE_CHARS);
455 av_log(avf, AV_LOG_ERROR, "Line %d: packet metadata required\n", line);
456 FAIL(AVERROR_INVALIDDATA);
458 if ((ret = av_dict_parse_string(&file->metadata, metadata, "=", "", 0)) < 0) {
459 av_log(avf, AV_LOG_ERROR, "Line %d: failed to parse metadata string\n", line);
461 FAIL(AVERROR_INVALIDDATA);
464 } else if (!strcmp(keyword, "stream")) {
465 if (!avformat_new_stream(avf, NULL))
466 FAIL(AVERROR(ENOMEM));
467 } else if (!strcmp(keyword, "exact_stream_id")) {
468 if (!avf->nb_streams) {
469 av_log(avf, AV_LOG_ERROR, "Line %d: exact_stream_id without stream\n",
471 FAIL(AVERROR_INVALIDDATA);
473 avf->streams[avf->nb_streams - 1]->id =
474 strtol(get_keyword(&cursor), NULL, 0);
475 } else if (!strcmp(keyword, "ffconcat")) {
476 char *ver_kw = get_keyword(&cursor);
477 char *ver_val = get_keyword(&cursor);
478 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
479 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
480 FAIL(AVERROR_INVALIDDATA);
485 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
487 FAIL(AVERROR_INVALIDDATA);
490 if (ret != AVERROR_EOF && ret < 0)
493 FAIL(AVERROR_INVALIDDATA);
495 for (i = 0; i < cat->nb_files; i++) {
496 if (cat->files[i].start_time == AV_NOPTS_VALUE)
497 cat->files[i].start_time = time;
499 time = cat->files[i].start_time;
500 if (cat->files[i].user_duration == AV_NOPTS_VALUE) {
501 if (cat->files[i].inpoint == AV_NOPTS_VALUE || cat->files[i].outpoint == AV_NOPTS_VALUE)
503 cat->files[i].user_duration = cat->files[i].outpoint - cat->files[i].inpoint;
505 cat->files[i].duration = cat->files[i].user_duration;
506 time += cat->files[i].user_duration;
508 if (i == cat->nb_files) {
509 avf->duration = time;
513 cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
515 if ((ret = open_file(avf, 0)) < 0)
517 av_bprint_finalize(&bp, NULL);
521 av_bprint_finalize(&bp, NULL);
522 concat_read_close(avf);
526 static int open_next_file(AVFormatContext *avf)
528 ConcatContext *cat = avf->priv_data;
529 unsigned fileno = cat->cur_file - cat->files;
531 cat->cur_file->duration = get_best_effort_duration(cat->cur_file, cat->avf);
533 if (++fileno >= cat->nb_files) {
537 return open_file(avf, fileno);
540 static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt)
545 ret = av_bsf_send_packet(cs->bsf, pkt);
547 av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb filter "
548 "failed to send input packet\n");
549 av_packet_unref(pkt);
554 ret = av_bsf_receive_packet(cs->bsf, pkt);
556 if (ret < 0 && (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)) {
557 av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb filter "
558 "failed to receive output packet\n");
565 /* Returns true if the packet dts is greater or equal to the specified outpoint. */
566 static int packet_after_outpoint(ConcatContext *cat, AVPacket *pkt)
568 if (cat->cur_file->outpoint != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE) {
569 return av_compare_ts(pkt->dts, cat->avf->streams[pkt->stream_index]->time_base,
570 cat->cur_file->outpoint, AV_TIME_BASE_Q) >= 0;
575 static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
577 ConcatContext *cat = avf->priv_data;
590 ret = av_read_frame(cat->avf, pkt);
591 if (ret == AVERROR_EOF) {
592 if ((ret = open_next_file(avf)) < 0)
598 if ((ret = match_streams(avf)) < 0) {
599 av_packet_unref(pkt);
602 if (packet_after_outpoint(cat, pkt)) {
603 av_packet_unref(pkt);
604 if ((ret = open_next_file(avf)) < 0)
608 cs = &cat->cur_file->streams[pkt->stream_index];
609 if (cs->out_stream_index < 0) {
610 av_packet_unref(pkt);
615 if ((ret = filter_packet(avf, cs, pkt)))
618 st = cat->avf->streams[pkt->stream_index];
619 av_log(avf, AV_LOG_DEBUG, "file:%d stream:%d pts:%s pts_time:%s dts:%s dts_time:%s",
620 (unsigned)(cat->cur_file - cat->files), pkt->stream_index,
621 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
622 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
624 delta = av_rescale_q(cat->cur_file->start_time - cat->cur_file->file_inpoint,
626 cat->avf->streams[pkt->stream_index]->time_base);
627 if (pkt->pts != AV_NOPTS_VALUE)
629 if (pkt->dts != AV_NOPTS_VALUE)
631 av_log(avf, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
632 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
633 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
634 if (cat->cur_file->metadata) {
637 char* packed_metadata = av_packet_pack_dictionary(cat->cur_file->metadata, &metadata_len);
638 if (!packed_metadata)
639 return AVERROR(ENOMEM);
640 if (!(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA, metadata_len))) {
641 av_freep(&packed_metadata);
642 return AVERROR(ENOMEM);
644 memcpy(metadata, packed_metadata, metadata_len);
645 av_freep(&packed_metadata);
648 if (cat->cur_file->duration == AV_NOPTS_VALUE && st->cur_dts != AV_NOPTS_VALUE) {
649 int64_t next_dts = av_rescale_q(st->cur_dts, st->time_base, AV_TIME_BASE_Q);
650 if (cat->cur_file->next_dts == AV_NOPTS_VALUE || next_dts > cat->cur_file->next_dts) {
651 cat->cur_file->next_dts = next_dts;
655 pkt->stream_index = cs->out_stream_index;
659 static void rescale_interval(AVRational tb_in, AVRational tb_out,
660 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
662 *ts = av_rescale_q (* ts, tb_in, tb_out);
663 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
664 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
665 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
666 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
669 static int try_seek(AVFormatContext *avf, int stream,
670 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
672 ConcatContext *cat = avf->priv_data;
673 int64_t t0 = cat->cur_file->start_time - cat->cur_file->file_inpoint;
676 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
677 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
679 if (stream >= cat->avf->nb_streams)
681 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
682 &min_ts, &ts, &max_ts);
684 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
687 static int real_seek(AVFormatContext *avf, int stream,
688 int64_t min_ts, int64_t ts, int64_t max_ts, int flags, AVFormatContext *cur_avf)
690 ConcatContext *cat = avf->priv_data;
691 int ret, left, right;
694 if (stream >= avf->nb_streams)
695 return AVERROR(EINVAL);
696 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
697 &min_ts, &ts, &max_ts);
701 right = cat->nb_files;
703 /* Always support seek to start */
706 else if (!cat->seekable)
707 return AVERROR(ESPIPE); /* XXX: can we use it? */
709 while (right - left > 1) {
710 int mid = (left + right) / 2;
711 if (ts < cat->files[mid].start_time)
717 if (cat->cur_file != &cat->files[left]) {
718 if ((ret = open_file(avf, left)) < 0)
724 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
726 left < cat->nb_files - 1 &&
727 cat->files[left + 1].start_time < max_ts) {
728 if (cat->cur_file == &cat->files[left])
730 if ((ret = open_file(avf, left + 1)) < 0)
732 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
737 static int concat_seek(AVFormatContext *avf, int stream,
738 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
740 ConcatContext *cat = avf->priv_data;
741 ConcatFile *cur_file_saved = cat->cur_file;
742 AVFormatContext *cur_avf_saved = cat->avf;
745 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
746 return AVERROR(ENOSYS);
748 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags, cur_avf_saved)) < 0) {
749 if (cat->cur_file != cur_file_saved) {
751 avformat_close_input(&cat->avf);
753 cat->avf = cur_avf_saved;
754 cat->cur_file = cur_file_saved;
756 if (cat->cur_file != cur_file_saved) {
757 avformat_close_input(&cur_avf_saved);
764 #define OFFSET(x) offsetof(ConcatContext, x)
765 #define DEC AV_OPT_FLAG_DECODING_PARAM
767 static const AVOption options[] = {
768 { "safe", "enable safe mode",
769 OFFSET(safe), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, DEC },
770 { "auto_convert", "automatically convert bitstream format",
771 OFFSET(auto_convert), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, DEC },
772 { "segment_time_metadata", "output file segment start time and duration as packet metadata",
773 OFFSET(segment_time_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
777 static const AVClass concat_class = {
778 .class_name = "concat demuxer",
779 .item_name = av_default_item_name,
781 .version = LIBAVUTIL_VERSION_INT,
785 AVInputFormat ff_concat_demuxer = {
787 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
788 .priv_data_size = sizeof(ConcatContext),
789 .read_probe = concat_probe,
790 .read_header = concat_read_header,
791 .read_packet = concat_read_packet,
792 .read_close = concat_read_close,
793 .read_seek2 = concat_seek,
794 .priv_class = &concat_class,