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);
135 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
136 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
137 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
140 cat->cur_file = file;
141 if (file->start_time == AV_NOPTS_VALUE)
142 file->start_time = !fileno ? 0 :
143 cat->files[fileno - 1].start_time +
144 cat->files[fileno - 1].duration;
148 static int concat_read_close(AVFormatContext *avf)
150 ConcatContext *cat = avf->priv_data;
154 avformat_close_input(&cat->avf);
155 for (i = 0; i < cat->nb_files; i++)
156 av_freep(&cat->files[i].url);
157 av_freep(&cat->files);
161 static int concat_read_header(AVFormatContext *avf)
163 ConcatContext *cat = avf->priv_data;
165 uint8_t *cursor, *keyword;
166 int ret, line = 0, i;
167 unsigned nb_files_alloc = 0;
168 ConcatFile *file = NULL;
169 AVStream *st, *source_st;
173 if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
177 keyword = get_keyword(&cursor);
178 if (!*keyword || *keyword == '#')
181 if (!strcmp(keyword, "file")) {
182 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
184 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
185 FAIL(AVERROR_INVALIDDATA);
187 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
189 } else if (!strcmp(keyword, "duration")) {
190 char *dur_str = get_keyword(&cursor);
193 av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
195 FAIL(AVERROR_INVALIDDATA);
197 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
198 av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
202 file->duration = dur;
203 } else if (!strcmp(keyword, "ffconcat")) {
204 char *ver_kw = get_keyword(&cursor);
205 char *ver_val = get_keyword(&cursor);
206 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
207 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
208 FAIL(AVERROR_INVALIDDATA);
213 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
215 FAIL(AVERROR_INVALIDDATA);
221 FAIL(AVERROR_INVALIDDATA);
223 for (i = 0; i < cat->nb_files; i++) {
224 if (cat->files[i].start_time == AV_NOPTS_VALUE)
225 cat->files[i].start_time = time;
227 time = cat->files[i].start_time;
228 if (cat->files[i].duration == AV_NOPTS_VALUE)
230 time += cat->files[i].duration;
232 if (i == cat->nb_files) {
233 avf->duration = time;
237 if ((ret = open_file(avf, 0)) < 0)
239 for (i = 0; i < cat->avf->nb_streams; i++) {
240 if (!(st = avformat_new_stream(avf, NULL)))
241 FAIL(AVERROR(ENOMEM));
242 source_st = cat->avf->streams[i];
243 if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
245 st->r_frame_rate = source_st->r_frame_rate;
246 st->avg_frame_rate = source_st->avg_frame_rate;
247 st->time_base = source_st->time_base;
248 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
254 concat_read_close(avf);
258 static int open_next_file(AVFormatContext *avf)
260 ConcatContext *cat = avf->priv_data;
261 unsigned fileno = cat->cur_file - cat->files;
263 if (cat->cur_file->duration == AV_NOPTS_VALUE)
264 cat->cur_file->duration = cat->avf->duration;
266 if (++fileno >= cat->nb_files)
268 return open_file(avf, fileno);
271 static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
273 ConcatContext *cat = avf->priv_data;
278 if ((ret = av_read_frame(cat->avf, pkt)) != AVERROR_EOF ||
279 (ret = open_next_file(avf)) < 0)
282 delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time,
284 cat->avf->streams[pkt->stream_index]->time_base);
285 if (pkt->pts != AV_NOPTS_VALUE)
287 if (pkt->dts != AV_NOPTS_VALUE)
292 static void rescale_interval(AVRational tb_in, AVRational tb_out,
293 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
295 *ts = av_rescale_q (* ts, tb_in, tb_out);
296 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
297 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
298 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
299 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
302 static int try_seek(AVFormatContext *avf, int stream,
303 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
305 ConcatContext *cat = avf->priv_data;
306 int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
309 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
310 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
312 if (stream >= cat->avf->nb_streams)
314 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
315 &min_ts, &ts, &max_ts);
317 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
320 static int real_seek(AVFormatContext *avf, int stream,
321 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
323 ConcatContext *cat = avf->priv_data;
324 int ret, left, right;
327 if (stream >= avf->nb_streams)
328 return AVERROR(EINVAL);
329 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
330 &min_ts, &ts, &max_ts);
334 right = cat->nb_files;
335 while (right - left > 1) {
336 int mid = (left + right) / 2;
337 if (ts < cat->files[mid].start_time)
343 if ((ret = open_file(avf, left)) < 0)
346 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
348 left < cat->nb_files - 1 &&
349 cat->files[left + 1].start_time < max_ts) {
350 if ((ret = open_file(avf, left + 1)) < 0)
352 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
357 static int concat_seek(AVFormatContext *avf, int stream,
358 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
360 ConcatContext *cat = avf->priv_data;
361 ConcatFile *cur_file_saved = cat->cur_file;
362 AVFormatContext *cur_avf_saved = cat->avf;
366 return AVERROR(ESPIPE); /* XXX: can we use it? */
367 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
368 return AVERROR(ENOSYS);
370 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
372 avformat_close_input(&cat->avf);
373 cat->avf = cur_avf_saved;
374 cat->cur_file = cur_file_saved;
376 avformat_close_input(&cur_avf_saved);
381 #define OFFSET(x) offsetof(ConcatContext, x)
382 #define DEC AV_OPT_FLAG_DECODING_PARAM
384 static const AVOption options[] = {
385 { "safe", "enable safe mode",
386 OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
390 static const AVClass concat_class = {
391 .class_name = "concat demuxer",
392 .item_name = av_default_item_name,
394 .version = LIBAVUTIL_VERSION_INT,
398 AVInputFormat ff_concat_demuxer = {
400 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
401 .priv_data_size = sizeof(ConcatContext),
402 .read_probe = concat_probe,
403 .read_header = concat_read_header,
404 .read_packet = concat_read_packet,
405 .read_close = concat_read_close,
406 .read_seek2 = concat_seek,
407 .priv_class = &concat_class,