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/intreadwrite.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/parseutils.h"
26 #include "libavutil/timestamp.h"
31 typedef enum ConcatMatchMode {
36 typedef struct ConcatStream {
37 AVBitStreamFilterContext *bsf;
45 ConcatStream *streams;
57 ConcatMatchMode stream_match_mode;
58 unsigned auto_convert;
61 static int concat_probe(AVProbeData *probe)
63 return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
64 0 : AVPROBE_SCORE_MAX;
67 static char *get_keyword(uint8_t **cursor)
69 char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
70 *cursor += strcspn(*cursor, SPACE_CHARS);
73 *cursor += strspn(*cursor, SPACE_CHARS);
78 static int safe_filename(const char *f)
80 const char *start = f;
84 if (!((unsigned)((*f | 32) - 'a') < 26 ||
85 (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
97 #define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
99 static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
100 unsigned *nb_files_alloc)
102 ConcatContext *cat = avf->priv_data;
106 size_t url_len, proto_len;
109 if (cat->safe > 0 && !safe_filename(filename)) {
110 av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
111 FAIL(AVERROR(EPERM));
114 proto = avio_find_protocol_name(filename);
115 proto_len = proto ? strlen(proto) : 0;
116 if (!memcmp(filename, proto, proto_len) &&
117 (filename[proto_len] == ':' || filename[proto_len] == ',')) {
121 url_len = strlen(avf->filename) + strlen(filename) + 16;
122 if (!(url = av_malloc(url_len)))
123 FAIL(AVERROR(ENOMEM));
124 ff_make_absolute_url(url, url_len, avf->filename, filename);
128 if (cat->nb_files >= *nb_files_alloc) {
129 size_t n = FFMAX(*nb_files_alloc * 2, 16);
130 ConcatFile *new_files;
131 if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
132 !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
133 FAIL(AVERROR(ENOMEM));
134 cat->files = new_files;
138 file = &cat->files[cat->nb_files++];
139 memset(file, 0, sizeof(*file));
143 file->start_time = AV_NOPTS_VALUE;
144 file->duration = AV_NOPTS_VALUE;
154 static int copy_stream_props(AVStream *st, AVStream *source_st)
158 if (st->codec->codec_id || !source_st->codec->codec_id) {
159 if (st->codec->extradata_size < source_st->codec->extradata_size) {
160 ret = ff_alloc_extradata(st->codec,
161 source_st->codec->extradata_size);
165 memcpy(st->codec->extradata, source_st->codec->extradata,
166 source_st->codec->extradata_size);
169 if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
171 st->r_frame_rate = source_st->r_frame_rate;
172 st->avg_frame_rate = source_st->avg_frame_rate;
173 st->time_base = source_st->time_base;
174 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
178 static int detect_stream_specific(AVFormatContext *avf, int idx)
180 ConcatContext *cat = avf->priv_data;
181 AVStream *st = cat->avf->streams[idx];
182 ConcatStream *cs = &cat->cur_file->streams[idx];
183 AVBitStreamFilterContext *bsf;
185 if (cat->auto_convert && st->codec->codec_id == AV_CODEC_ID_H264 &&
186 (st->codec->extradata_size < 4 || AV_RB32(st->codec->extradata) != 1)) {
187 av_log(cat->avf, AV_LOG_INFO,
188 "Auto-inserting h264_mp4toannexb bitstream filter\n");
189 if (!(bsf = av_bitstream_filter_init("h264_mp4toannexb"))) {
190 av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter "
191 "required for H.264 streams\n");
192 return AVERROR_BSF_NOT_FOUND;
199 static int match_streams_one_to_one(AVFormatContext *avf)
201 ConcatContext *cat = avf->priv_data;
205 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
206 if (i < avf->nb_streams) {
207 st = avf->streams[i];
209 if (!(st = avformat_new_stream(avf, NULL)))
210 return AVERROR(ENOMEM);
212 if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0)
214 cat->cur_file->streams[i].out_stream_index = i;
219 static int match_streams_exact_id(AVFormatContext *avf)
221 ConcatContext *cat = avf->priv_data;
225 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
226 st = cat->avf->streams[i];
227 for (j = 0; j < avf->nb_streams; j++) {
228 if (avf->streams[j]->id == st->id) {
229 av_log(avf, AV_LOG_VERBOSE,
230 "Match slave stream #%d with stream #%d id 0x%x\n",
232 if ((ret = copy_stream_props(avf->streams[j], st)) < 0)
234 cat->cur_file->streams[i].out_stream_index = j;
241 static int match_streams(AVFormatContext *avf)
243 ConcatContext *cat = avf->priv_data;
247 if (cat->cur_file->nb_streams >= cat->avf->nb_streams)
249 map = av_realloc(cat->cur_file->streams,
250 cat->avf->nb_streams * sizeof(*map));
252 return AVERROR(ENOMEM);
253 cat->cur_file->streams = map;
254 memset(map + cat->cur_file->nb_streams, 0,
255 (cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map));
257 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
258 map[i].out_stream_index = -1;
259 switch (cat->stream_match_mode) {
260 case MATCH_ONE_TO_ONE:
261 ret = match_streams_one_to_one(avf);
264 ret = match_streams_exact_id(avf);
271 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
272 if ((ret = detect_stream_specific(avf, i)) < 0)
274 cat->cur_file->nb_streams = cat->avf->nb_streams;
278 static int open_file(AVFormatContext *avf, unsigned fileno)
280 ConcatContext *cat = avf->priv_data;
281 ConcatFile *file = &cat->files[fileno];
285 avformat_close_input(&cat->avf);
287 cat->avf = avformat_alloc_context();
289 return AVERROR(ENOMEM);
291 cat->avf->interrupt_callback = avf->interrupt_callback;
293 if ((ret = ff_copy_whitelists(cat->avf, avf)) < 0)
296 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
297 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
298 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
299 avformat_close_input(&cat->avf);
302 cat->cur_file = file;
303 if (file->start_time == AV_NOPTS_VALUE)
304 file->start_time = !fileno ? 0 :
305 cat->files[fileno - 1].start_time +
306 cat->files[fileno - 1].duration;
307 if ((ret = match_streams(avf)) < 0)
312 static int concat_read_close(AVFormatContext *avf)
314 ConcatContext *cat = avf->priv_data;
318 avformat_close_input(&cat->avf);
319 for (i = 0; i < cat->nb_files; i++) {
320 av_freep(&cat->files[i].url);
321 av_freep(&cat->files[i].streams);
323 av_freep(&cat->files);
327 static int concat_read_header(AVFormatContext *avf)
329 ConcatContext *cat = avf->priv_data;
331 uint8_t *cursor, *keyword;
332 int ret, line = 0, i;
333 unsigned nb_files_alloc = 0;
334 ConcatFile *file = NULL;
338 if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
342 keyword = get_keyword(&cursor);
343 if (!*keyword || *keyword == '#')
346 if (!strcmp(keyword, "file")) {
347 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
349 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
350 FAIL(AVERROR_INVALIDDATA);
352 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
354 } else if (!strcmp(keyword, "duration")) {
355 char *dur_str = get_keyword(&cursor);
358 av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
360 FAIL(AVERROR_INVALIDDATA);
362 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
363 av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
367 file->duration = dur;
368 } else if (!strcmp(keyword, "stream")) {
369 if (!avformat_new_stream(avf, NULL))
370 FAIL(AVERROR(ENOMEM));
371 } else if (!strcmp(keyword, "exact_stream_id")) {
372 if (!avf->nb_streams) {
373 av_log(avf, AV_LOG_ERROR, "Line %d: exact_stream_id without stream\n",
375 FAIL(AVERROR_INVALIDDATA);
377 avf->streams[avf->nb_streams - 1]->id =
378 strtol(get_keyword(&cursor), NULL, 0);
379 } else if (!strcmp(keyword, "ffconcat")) {
380 char *ver_kw = get_keyword(&cursor);
381 char *ver_val = get_keyword(&cursor);
382 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
383 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
384 FAIL(AVERROR_INVALIDDATA);
389 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
391 FAIL(AVERROR_INVALIDDATA);
397 FAIL(AVERROR_INVALIDDATA);
399 for (i = 0; i < cat->nb_files; i++) {
400 if (cat->files[i].start_time == AV_NOPTS_VALUE)
401 cat->files[i].start_time = time;
403 time = cat->files[i].start_time;
404 if (cat->files[i].duration == AV_NOPTS_VALUE)
406 time += cat->files[i].duration;
408 if (i == cat->nb_files) {
409 avf->duration = time;
413 cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
415 if ((ret = open_file(avf, 0)) < 0)
420 concat_read_close(avf);
424 static int open_next_file(AVFormatContext *avf)
426 ConcatContext *cat = avf->priv_data;
427 unsigned fileno = cat->cur_file - cat->files;
429 if (cat->cur_file->duration == AV_NOPTS_VALUE)
430 cat->cur_file->duration = cat->avf->duration;
432 if (++fileno >= cat->nb_files)
434 return open_file(avf, fileno);
437 static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt)
439 AVStream *st = avf->streams[cs->out_stream_index];
440 AVBitStreamFilterContext *bsf;
444 av_assert0(cs->out_stream_index >= 0);
445 for (bsf = cs->bsf; bsf; bsf = bsf->next) {
447 ret = av_bitstream_filter_filter(bsf, st->codec, NULL,
448 &pkt2.data, &pkt2.size,
449 pkt->data, pkt->size,
450 !!(pkt->flags & AV_PKT_FLAG_KEY));
452 av_packet_unref(pkt);
455 av_assert0(pkt2.buf);
456 if (ret == 0 && pkt2.data != pkt->data) {
457 if ((ret = av_copy_packet(&pkt2, pkt)) < 0) {
465 pkt2.buf = av_buffer_create(pkt2.data, pkt2.size,
466 av_buffer_default_free, NULL, 0);
469 return AVERROR(ENOMEM);
477 static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
479 ConcatContext *cat = avf->priv_data;
481 int64_t file_start_time, delta;
489 ret = av_read_frame(cat->avf, pkt);
490 if (ret == AVERROR_EOF) {
491 if ((ret = open_next_file(avf)) < 0)
497 if ((ret = match_streams(avf)) < 0) {
498 av_packet_unref(pkt);
501 cs = &cat->cur_file->streams[pkt->stream_index];
502 if (cs->out_stream_index < 0) {
503 av_packet_unref(pkt);
506 pkt->stream_index = cs->out_stream_index;
509 if ((ret = filter_packet(avf, cs, pkt)))
512 st = cat->avf->streams[pkt->stream_index];
513 av_log(avf, AV_LOG_DEBUG, "file:%d stream:%d pts:%s pts_time:%s dts:%s dts_time:%s",
514 (unsigned)(cat->cur_file - cat->files), pkt->stream_index,
515 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
516 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
518 file_start_time = cat->avf->start_time;
519 if (file_start_time == AV_NOPTS_VALUE)
521 delta = av_rescale_q(cat->cur_file->start_time - file_start_time,
523 cat->avf->streams[pkt->stream_index]->time_base);
524 if (pkt->pts != AV_NOPTS_VALUE)
526 if (pkt->dts != AV_NOPTS_VALUE)
528 av_log(avf, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
529 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
530 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
534 static void rescale_interval(AVRational tb_in, AVRational tb_out,
535 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
537 *ts = av_rescale_q (* ts, tb_in, tb_out);
538 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
539 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
540 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
541 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
544 static int try_seek(AVFormatContext *avf, int stream,
545 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
547 ConcatContext *cat = avf->priv_data;
548 int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
551 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
552 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
554 if (stream >= cat->avf->nb_streams)
556 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
557 &min_ts, &ts, &max_ts);
559 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
562 static int real_seek(AVFormatContext *avf, int stream,
563 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
565 ConcatContext *cat = avf->priv_data;
566 int ret, left, right;
569 if (stream >= avf->nb_streams)
570 return AVERROR(EINVAL);
571 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
572 &min_ts, &ts, &max_ts);
576 right = cat->nb_files;
577 while (right - left > 1) {
578 int mid = (left + right) / 2;
579 if (ts < cat->files[mid].start_time)
585 if ((ret = open_file(avf, left)) < 0)
588 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
590 left < cat->nb_files - 1 &&
591 cat->files[left + 1].start_time < max_ts) {
592 if ((ret = open_file(avf, left + 1)) < 0)
594 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
599 static int concat_seek(AVFormatContext *avf, int stream,
600 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
602 ConcatContext *cat = avf->priv_data;
603 ConcatFile *cur_file_saved = cat->cur_file;
604 AVFormatContext *cur_avf_saved = cat->avf;
608 return AVERROR(ESPIPE); /* XXX: can we use it? */
609 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
610 return AVERROR(ENOSYS);
612 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
614 avformat_close_input(&cat->avf);
615 cat->avf = cur_avf_saved;
616 cat->cur_file = cur_file_saved;
618 avformat_close_input(&cur_avf_saved);
623 #define OFFSET(x) offsetof(ConcatContext, x)
624 #define DEC AV_OPT_FLAG_DECODING_PARAM
626 static const AVOption options[] = {
627 { "safe", "enable safe mode",
628 OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
629 { "auto_convert", "automatically convert bitstream format",
630 OFFSET(auto_convert), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, DEC },
634 static const AVClass concat_class = {
635 .class_name = "concat demuxer",
636 .item_name = av_default_item_name,
638 .version = LIBAVUTIL_VERSION_INT,
642 AVInputFormat ff_concat_demuxer = {
644 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
645 .priv_data_size = sizeof(ConcatContext),
646 .read_probe = concat_probe,
647 .read_header = concat_read_header,
648 .read_packet = concat_read_packet,
649 .read_close = concat_read_close,
650 .read_seek2 = concat_seek,
651 .priv_class = &concat_class,