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/avstring.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/parseutils.h"
44 static int concat_probe(AVProbeData *probe)
46 return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
47 0 : AVPROBE_SCORE_MAX;
50 static char *get_keyword(uint8_t **cursor)
52 char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
53 *cursor += strcspn(*cursor, SPACE_CHARS);
56 *cursor += strspn(*cursor, SPACE_CHARS);
61 static int safe_filename(const char *f)
63 const char *start = f;
67 if (!((unsigned)((*f | 32) - 'a') < 26 ||
68 (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
80 #define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
82 static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
83 unsigned *nb_files_alloc)
85 ConcatContext *cat = avf->priv_data;
91 if (cat->safe > 0 && !safe_filename(filename)) {
92 av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
95 url_len = strlen(avf->filename) + strlen(filename) + 16;
96 if (!(url = av_malloc(url_len)))
97 FAIL(AVERROR(ENOMEM));
98 ff_make_absolute_url(url, url_len, avf->filename, filename);
101 if (cat->nb_files >= *nb_files_alloc) {
102 size_t n = FFMAX(*nb_files_alloc * 2, 16);
103 ConcatFile *new_files;
104 if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
105 !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
106 FAIL(AVERROR(ENOMEM));
107 cat->files = new_files;
111 file = &cat->files[cat->nb_files++];
112 memset(file, 0, sizeof(*file));
116 file->start_time = AV_NOPTS_VALUE;
117 file->duration = AV_NOPTS_VALUE;
127 static int open_file(AVFormatContext *avf, unsigned fileno)
129 ConcatContext *cat = avf->priv_data;
130 ConcatFile *file = &cat->files[fileno];
134 avformat_close_input(&cat->avf);
136 cat->avf = avformat_alloc_context();
138 return AVERROR(ENOMEM);
140 cat->avf->interrupt_callback = avf->interrupt_callback;
141 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
142 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
143 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
144 avformat_close_input(&cat->avf);
147 cat->cur_file = file;
148 if (file->start_time == AV_NOPTS_VALUE)
149 file->start_time = !fileno ? 0 :
150 cat->files[fileno - 1].start_time +
151 cat->files[fileno - 1].duration;
155 static int concat_read_close(AVFormatContext *avf)
157 ConcatContext *cat = avf->priv_data;
161 avformat_close_input(&cat->avf);
162 for (i = 0; i < cat->nb_files; i++)
163 av_freep(&cat->files[i].url);
164 av_freep(&cat->files);
168 static int concat_read_header(AVFormatContext *avf)
170 ConcatContext *cat = avf->priv_data;
172 uint8_t *cursor, *keyword;
173 int ret, line = 0, i;
174 unsigned nb_files_alloc = 0;
175 ConcatFile *file = NULL;
176 AVStream *st, *source_st;
180 if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
184 keyword = get_keyword(&cursor);
185 if (!*keyword || *keyword == '#')
188 if (!strcmp(keyword, "file")) {
189 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
191 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
192 FAIL(AVERROR_INVALIDDATA);
194 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
196 } else if (!strcmp(keyword, "duration")) {
197 char *dur_str = get_keyword(&cursor);
200 av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
202 FAIL(AVERROR_INVALIDDATA);
204 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
205 av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
209 file->duration = dur;
210 } else if (!strcmp(keyword, "ffconcat")) {
211 char *ver_kw = get_keyword(&cursor);
212 char *ver_val = get_keyword(&cursor);
213 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
214 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
215 FAIL(AVERROR_INVALIDDATA);
220 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
222 FAIL(AVERROR_INVALIDDATA);
228 FAIL(AVERROR_INVALIDDATA);
230 for (i = 0; i < cat->nb_files; i++) {
231 if (cat->files[i].start_time == AV_NOPTS_VALUE)
232 cat->files[i].start_time = time;
234 time = cat->files[i].start_time;
235 if (cat->files[i].duration == AV_NOPTS_VALUE)
237 time += cat->files[i].duration;
239 if (i == cat->nb_files) {
240 avf->duration = time;
244 if ((ret = open_file(avf, 0)) < 0)
246 for (i = 0; i < cat->avf->nb_streams; i++) {
247 if (!(st = avformat_new_stream(avf, NULL)))
248 FAIL(AVERROR(ENOMEM));
249 source_st = cat->avf->streams[i];
250 if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
252 st->r_frame_rate = source_st->r_frame_rate;
253 st->avg_frame_rate = source_st->avg_frame_rate;
254 st->time_base = source_st->time_base;
255 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
261 concat_read_close(avf);
265 static int open_next_file(AVFormatContext *avf)
267 ConcatContext *cat = avf->priv_data;
268 unsigned fileno = cat->cur_file - cat->files;
270 if (cat->cur_file->duration == AV_NOPTS_VALUE)
271 cat->cur_file->duration = cat->avf->duration;
273 if (++fileno >= cat->nb_files)
275 return open_file(avf, fileno);
278 static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
280 ConcatContext *cat = avf->priv_data;
285 if ((ret = av_read_frame(cat->avf, pkt)) != AVERROR_EOF ||
286 (ret = open_next_file(avf)) < 0)
292 delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time,
294 cat->avf->streams[pkt->stream_index]->time_base);
295 if (pkt->pts != AV_NOPTS_VALUE)
297 if (pkt->dts != AV_NOPTS_VALUE)
302 static void rescale_interval(AVRational tb_in, AVRational tb_out,
303 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
305 *ts = av_rescale_q (* ts, tb_in, tb_out);
306 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
307 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
308 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
309 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
312 static int try_seek(AVFormatContext *avf, int stream,
313 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
315 ConcatContext *cat = avf->priv_data;
316 int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
319 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
320 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
322 if (stream >= cat->avf->nb_streams)
324 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
325 &min_ts, &ts, &max_ts);
327 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
330 static int real_seek(AVFormatContext *avf, int stream,
331 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
333 ConcatContext *cat = avf->priv_data;
334 int ret, left, right;
337 if (stream >= avf->nb_streams)
338 return AVERROR(EINVAL);
339 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
340 &min_ts, &ts, &max_ts);
344 right = cat->nb_files;
345 while (right - left > 1) {
346 int mid = (left + right) / 2;
347 if (ts < cat->files[mid].start_time)
353 if ((ret = open_file(avf, left)) < 0)
356 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
358 left < cat->nb_files - 1 &&
359 cat->files[left + 1].start_time < max_ts) {
360 if ((ret = open_file(avf, left + 1)) < 0)
362 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
367 static int concat_seek(AVFormatContext *avf, int stream,
368 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
370 ConcatContext *cat = avf->priv_data;
371 ConcatFile *cur_file_saved = cat->cur_file;
372 AVFormatContext *cur_avf_saved = cat->avf;
376 return AVERROR(ESPIPE); /* XXX: can we use it? */
377 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
378 return AVERROR(ENOSYS);
380 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
382 avformat_close_input(&cat->avf);
383 cat->avf = cur_avf_saved;
384 cat->cur_file = cur_file_saved;
386 avformat_close_input(&cur_avf_saved);
391 #define OFFSET(x) offsetof(ConcatContext, x)
392 #define DEC AV_OPT_FLAG_DECODING_PARAM
394 static const AVOption options[] = {
395 { "safe", "enable safe mode",
396 OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
400 static const AVClass concat_class = {
401 .class_name = "concat demuxer",
402 .item_name = av_default_item_name,
404 .version = LIBAVUTIL_VERSION_INT,
408 AVInputFormat ff_concat_demuxer = {
410 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
411 .priv_data_size = sizeof(ConcatContext),
412 .read_probe = concat_probe,
413 .read_header = concat_read_header,
414 .read_packet = concat_read_packet,
415 .read_close = concat_read_close,
416 .read_seek2 = concat_seek,
417 .priv_class = &concat_class,