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"
30 typedef enum ConcatMatchMode {
35 typedef struct ConcatStream {
36 AVBitStreamFilterContext *bsf;
44 ConcatStream *streams;
56 ConcatMatchMode stream_match_mode;
57 unsigned auto_convert;
60 static int concat_probe(AVProbeData *probe)
62 return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
63 0 : AVPROBE_SCORE_MAX;
66 static char *get_keyword(uint8_t **cursor)
68 char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
69 *cursor += strcspn(*cursor, SPACE_CHARS);
72 *cursor += strspn(*cursor, SPACE_CHARS);
77 static int safe_filename(const char *f)
79 const char *start = f;
83 if (!((unsigned)((*f | 32) - 'a') < 26 ||
84 (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
96 #define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
98 static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
99 unsigned *nb_files_alloc)
101 ConcatContext *cat = avf->priv_data;
105 size_t url_len, proto_len;
108 if (cat->safe > 0 && !safe_filename(filename)) {
109 av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
110 FAIL(AVERROR(EPERM));
113 proto = avio_find_protocol_name(filename);
114 proto_len = proto ? strlen(proto) : 0;
115 if (!memcmp(filename, proto, proto_len) &&
116 (filename[proto_len] == ':' || filename[proto_len] == ',')) {
120 url_len = strlen(avf->filename) + strlen(filename) + 16;
121 if (!(url = av_malloc(url_len)))
122 FAIL(AVERROR(ENOMEM));
123 ff_make_absolute_url(url, url_len, avf->filename, filename);
127 if (cat->nb_files >= *nb_files_alloc) {
128 size_t n = FFMAX(*nb_files_alloc * 2, 16);
129 ConcatFile *new_files;
130 if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
131 !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
132 FAIL(AVERROR(ENOMEM));
133 cat->files = new_files;
137 file = &cat->files[cat->nb_files++];
138 memset(file, 0, sizeof(*file));
142 file->start_time = AV_NOPTS_VALUE;
143 file->duration = AV_NOPTS_VALUE;
153 static int copy_stream_props(AVStream *st, AVStream *source_st)
157 if (st->codec->codec_id || !source_st->codec->codec_id) {
158 if (st->codec->extradata_size < source_st->codec->extradata_size) {
159 ret = ff_alloc_extradata(st->codec,
160 source_st->codec->extradata_size);
164 memcpy(st->codec->extradata, source_st->codec->extradata,
165 source_st->codec->extradata_size);
168 if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
170 st->r_frame_rate = source_st->r_frame_rate;
171 st->avg_frame_rate = source_st->avg_frame_rate;
172 st->time_base = source_st->time_base;
173 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
177 static int detect_stream_specific(AVFormatContext *avf, int idx)
179 ConcatContext *cat = avf->priv_data;
180 AVStream *st = cat->avf->streams[idx];
181 ConcatStream *cs = &cat->cur_file->streams[idx];
182 AVBitStreamFilterContext *bsf;
184 if (cat->auto_convert && st->codec->codec_id == AV_CODEC_ID_H264 &&
185 (st->codec->extradata_size < 4 || AV_RB32(st->codec->extradata) != 1)) {
186 av_log(cat->avf, AV_LOG_INFO,
187 "Auto-inserting h264_mp4toannexb bitstream filter\n");
188 if (!(bsf = av_bitstream_filter_init("h264_mp4toannexb"))) {
189 av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter "
190 "required for H.264 streams\n");
191 return AVERROR_BSF_NOT_FOUND;
198 static int match_streams_one_to_one(AVFormatContext *avf)
200 ConcatContext *cat = avf->priv_data;
204 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
205 if (i < avf->nb_streams) {
206 st = avf->streams[i];
208 if (!(st = avformat_new_stream(avf, NULL)))
209 return AVERROR(ENOMEM);
211 if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0)
213 cat->cur_file->streams[i].out_stream_index = i;
218 static int match_streams_exact_id(AVFormatContext *avf)
220 ConcatContext *cat = avf->priv_data;
224 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
225 st = cat->avf->streams[i];
226 for (j = 0; j < avf->nb_streams; j++) {
227 if (avf->streams[j]->id == st->id) {
228 av_log(avf, AV_LOG_VERBOSE,
229 "Match slave stream #%d with stream #%d id 0x%x\n",
231 if ((ret = copy_stream_props(avf->streams[j], st)) < 0)
233 cat->cur_file->streams[i].out_stream_index = j;
240 static int match_streams(AVFormatContext *avf)
242 ConcatContext *cat = avf->priv_data;
246 if (cat->cur_file->nb_streams >= cat->avf->nb_streams)
248 map = av_realloc(cat->cur_file->streams,
249 cat->avf->nb_streams * sizeof(*map));
251 return AVERROR(ENOMEM);
252 cat->cur_file->streams = map;
253 memset(map + cat->cur_file->nb_streams, 0,
254 (cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map));
256 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
257 map[i].out_stream_index = -1;
258 switch (cat->stream_match_mode) {
259 case MATCH_ONE_TO_ONE:
260 ret = match_streams_one_to_one(avf);
263 ret = match_streams_exact_id(avf);
270 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
271 if ((ret = detect_stream_specific(avf, i)) < 0)
273 cat->cur_file->nb_streams = cat->avf->nb_streams;
277 static int open_file(AVFormatContext *avf, unsigned fileno)
279 ConcatContext *cat = avf->priv_data;
280 ConcatFile *file = &cat->files[fileno];
284 avformat_close_input(&cat->avf);
286 cat->avf = avformat_alloc_context();
288 return AVERROR(ENOMEM);
290 cat->avf->interrupt_callback = avf->interrupt_callback;
291 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
292 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
293 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
294 avformat_close_input(&cat->avf);
297 cat->cur_file = file;
298 if (file->start_time == AV_NOPTS_VALUE)
299 file->start_time = !fileno ? 0 :
300 cat->files[fileno - 1].start_time +
301 cat->files[fileno - 1].duration;
302 if ((ret = match_streams(avf)) < 0)
307 static int concat_read_close(AVFormatContext *avf)
309 ConcatContext *cat = avf->priv_data;
313 avformat_close_input(&cat->avf);
314 for (i = 0; i < cat->nb_files; i++) {
315 av_freep(&cat->files[i].url);
316 av_freep(&cat->files[i].streams);
318 av_freep(&cat->files);
322 static int concat_read_header(AVFormatContext *avf)
324 ConcatContext *cat = avf->priv_data;
326 uint8_t *cursor, *keyword;
327 int ret, line = 0, i;
328 unsigned nb_files_alloc = 0;
329 ConcatFile *file = NULL;
333 if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
337 keyword = get_keyword(&cursor);
338 if (!*keyword || *keyword == '#')
341 if (!strcmp(keyword, "file")) {
342 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
344 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
345 FAIL(AVERROR_INVALIDDATA);
347 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
349 } else if (!strcmp(keyword, "duration")) {
350 char *dur_str = get_keyword(&cursor);
353 av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
355 FAIL(AVERROR_INVALIDDATA);
357 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
358 av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
362 file->duration = dur;
363 } else if (!strcmp(keyword, "stream")) {
364 if (!avformat_new_stream(avf, NULL))
365 FAIL(AVERROR(ENOMEM));
366 } else if (!strcmp(keyword, "exact_stream_id")) {
367 if (!avf->nb_streams) {
368 av_log(avf, AV_LOG_ERROR, "Line %d: exact_stream_id without stream\n",
370 FAIL(AVERROR_INVALIDDATA);
372 avf->streams[avf->nb_streams - 1]->id =
373 strtol(get_keyword(&cursor), NULL, 0);
374 } else if (!strcmp(keyword, "ffconcat")) {
375 char *ver_kw = get_keyword(&cursor);
376 char *ver_val = get_keyword(&cursor);
377 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
378 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
379 FAIL(AVERROR_INVALIDDATA);
384 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
386 FAIL(AVERROR_INVALIDDATA);
392 FAIL(AVERROR_INVALIDDATA);
394 for (i = 0; i < cat->nb_files; i++) {
395 if (cat->files[i].start_time == AV_NOPTS_VALUE)
396 cat->files[i].start_time = time;
398 time = cat->files[i].start_time;
399 if (cat->files[i].duration == AV_NOPTS_VALUE)
401 time += cat->files[i].duration;
403 if (i == cat->nb_files) {
404 avf->duration = time;
408 cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
410 if ((ret = open_file(avf, 0)) < 0)
415 concat_read_close(avf);
419 static int open_next_file(AVFormatContext *avf)
421 ConcatContext *cat = avf->priv_data;
422 unsigned fileno = cat->cur_file - cat->files;
424 if (cat->cur_file->duration == AV_NOPTS_VALUE)
425 cat->cur_file->duration = cat->avf->duration;
427 if (++fileno >= cat->nb_files)
429 return open_file(avf, fileno);
432 static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt)
434 AVStream *st = avf->streams[cs->out_stream_index];
435 AVBitStreamFilterContext *bsf;
439 av_assert0(cs->out_stream_index >= 0);
440 for (bsf = cs->bsf; bsf; bsf = bsf->next) {
442 ret = av_bitstream_filter_filter(bsf, st->codec, NULL,
443 &pkt2.data, &pkt2.size,
444 pkt->data, pkt->size,
445 !!(pkt->flags & AV_PKT_FLAG_KEY));
447 av_packet_unref(pkt);
450 av_assert0(pkt2.buf);
451 if (ret == 0 && pkt2.data != pkt->data) {
452 if ((ret = av_copy_packet(&pkt2, pkt)) < 0) {
460 pkt2.buf = av_buffer_create(pkt2.data, pkt2.size,
461 av_buffer_default_free, NULL, 0);
464 return AVERROR(ENOMEM);
472 static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
474 ConcatContext *cat = avf->priv_data;
480 ret = av_read_frame(cat->avf, pkt);
481 if (ret == AVERROR_EOF) {
482 if ((ret = open_next_file(avf)) < 0)
488 if ((ret = match_streams(avf)) < 0) {
489 av_packet_unref(pkt);
492 cs = &cat->cur_file->streams[pkt->stream_index];
493 if (cs->out_stream_index < 0) {
494 av_packet_unref(pkt);
497 pkt->stream_index = cs->out_stream_index;
500 if ((ret = filter_packet(avf, cs, pkt)))
503 delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time,
505 cat->avf->streams[pkt->stream_index]->time_base);
506 if (pkt->pts != AV_NOPTS_VALUE)
508 if (pkt->dts != AV_NOPTS_VALUE)
513 static void rescale_interval(AVRational tb_in, AVRational tb_out,
514 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
516 *ts = av_rescale_q (* ts, tb_in, tb_out);
517 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
518 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
519 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
520 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
523 static int try_seek(AVFormatContext *avf, int stream,
524 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
526 ConcatContext *cat = avf->priv_data;
527 int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
530 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
531 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
533 if (stream >= cat->avf->nb_streams)
535 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
536 &min_ts, &ts, &max_ts);
538 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
541 static int real_seek(AVFormatContext *avf, int stream,
542 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
544 ConcatContext *cat = avf->priv_data;
545 int ret, left, right;
548 if (stream >= avf->nb_streams)
549 return AVERROR(EINVAL);
550 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
551 &min_ts, &ts, &max_ts);
555 right = cat->nb_files;
556 while (right - left > 1) {
557 int mid = (left + right) / 2;
558 if (ts < cat->files[mid].start_time)
564 if ((ret = open_file(avf, left)) < 0)
567 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
569 left < cat->nb_files - 1 &&
570 cat->files[left + 1].start_time < max_ts) {
571 if ((ret = open_file(avf, left + 1)) < 0)
573 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
578 static int concat_seek(AVFormatContext *avf, int stream,
579 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
581 ConcatContext *cat = avf->priv_data;
582 ConcatFile *cur_file_saved = cat->cur_file;
583 AVFormatContext *cur_avf_saved = cat->avf;
587 return AVERROR(ESPIPE); /* XXX: can we use it? */
588 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
589 return AVERROR(ENOSYS);
591 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
593 avformat_close_input(&cat->avf);
594 cat->avf = cur_avf_saved;
595 cat->cur_file = cur_file_saved;
597 avformat_close_input(&cur_avf_saved);
602 #define OFFSET(x) offsetof(ConcatContext, x)
603 #define DEC AV_OPT_FLAG_DECODING_PARAM
605 static const AVOption options[] = {
606 { "safe", "enable safe mode",
607 OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
608 { "auto_convert", "automatically convert bitstream format",
609 OFFSET(auto_convert), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
613 static const AVClass concat_class = {
614 .class_name = "concat demuxer",
615 .item_name = av_default_item_name,
617 .version = LIBAVUTIL_VERSION_INT,
621 AVInputFormat ff_concat_demuxer = {
623 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
624 .priv_data_size = sizeof(ConcatContext),
625 .read_probe = concat_probe,
626 .read_header = concat_read_header,
627 .read_packet = concat_read_packet,
628 .read_close = concat_read_close,
629 .read_seek2 = concat_seek,
630 .priv_class = &concat_class,