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;
89 size_t url_len, proto_len;
92 if (cat->safe > 0 && !safe_filename(filename)) {
93 av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
97 proto = avio_find_protocol_name(filename);
98 proto_len = proto ? strlen(proto) : 0;
99 if (!memcmp(filename, proto, proto_len) &&
100 (filename[proto_len] == ':' || filename[proto_len] == ',')) {
104 url_len = strlen(avf->filename) + strlen(filename) + 16;
105 if (!(url = av_malloc(url_len)))
106 FAIL(AVERROR(ENOMEM));
107 ff_make_absolute_url(url, url_len, avf->filename, filename);
111 if (cat->nb_files >= *nb_files_alloc) {
112 size_t n = FFMAX(*nb_files_alloc * 2, 16);
113 ConcatFile *new_files;
114 if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
115 !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
116 FAIL(AVERROR(ENOMEM));
117 cat->files = new_files;
121 file = &cat->files[cat->nb_files++];
122 memset(file, 0, sizeof(*file));
126 file->start_time = AV_NOPTS_VALUE;
127 file->duration = AV_NOPTS_VALUE;
137 static int open_file(AVFormatContext *avf, unsigned fileno)
139 ConcatContext *cat = avf->priv_data;
140 ConcatFile *file = &cat->files[fileno];
144 avformat_close_input(&cat->avf);
146 cat->avf = avformat_alloc_context();
148 return AVERROR(ENOMEM);
150 cat->avf->interrupt_callback = avf->interrupt_callback;
151 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
152 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
153 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
154 avformat_close_input(&cat->avf);
157 cat->cur_file = file;
158 if (file->start_time == AV_NOPTS_VALUE)
159 file->start_time = !fileno ? 0 :
160 cat->files[fileno - 1].start_time +
161 cat->files[fileno - 1].duration;
165 static int concat_read_close(AVFormatContext *avf)
167 ConcatContext *cat = avf->priv_data;
171 avformat_close_input(&cat->avf);
172 for (i = 0; i < cat->nb_files; i++)
173 av_freep(&cat->files[i].url);
174 av_freep(&cat->files);
178 static int concat_read_header(AVFormatContext *avf)
180 ConcatContext *cat = avf->priv_data;
182 uint8_t *cursor, *keyword;
183 int ret, line = 0, i;
184 unsigned nb_files_alloc = 0;
185 ConcatFile *file = NULL;
186 AVStream *st, *source_st;
190 if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
194 keyword = get_keyword(&cursor);
195 if (!*keyword || *keyword == '#')
198 if (!strcmp(keyword, "file")) {
199 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
201 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
202 FAIL(AVERROR_INVALIDDATA);
204 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
206 } else if (!strcmp(keyword, "duration")) {
207 char *dur_str = get_keyword(&cursor);
210 av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
212 FAIL(AVERROR_INVALIDDATA);
214 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
215 av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
219 file->duration = dur;
220 } else if (!strcmp(keyword, "ffconcat")) {
221 char *ver_kw = get_keyword(&cursor);
222 char *ver_val = get_keyword(&cursor);
223 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
224 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
225 FAIL(AVERROR_INVALIDDATA);
230 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
232 FAIL(AVERROR_INVALIDDATA);
238 FAIL(AVERROR_INVALIDDATA);
240 for (i = 0; i < cat->nb_files; i++) {
241 if (cat->files[i].start_time == AV_NOPTS_VALUE)
242 cat->files[i].start_time = time;
244 time = cat->files[i].start_time;
245 if (cat->files[i].duration == AV_NOPTS_VALUE)
247 time += cat->files[i].duration;
249 if (i == cat->nb_files) {
250 avf->duration = time;
254 if ((ret = open_file(avf, 0)) < 0)
256 for (i = 0; i < cat->avf->nb_streams; i++) {
257 if (!(st = avformat_new_stream(avf, NULL)))
258 FAIL(AVERROR(ENOMEM));
259 source_st = cat->avf->streams[i];
260 if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
262 st->r_frame_rate = source_st->r_frame_rate;
263 st->avg_frame_rate = source_st->avg_frame_rate;
264 st->time_base = source_st->time_base;
265 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
271 concat_read_close(avf);
275 static int open_next_file(AVFormatContext *avf)
277 ConcatContext *cat = avf->priv_data;
278 unsigned fileno = cat->cur_file - cat->files;
280 if (cat->cur_file->duration == AV_NOPTS_VALUE)
281 cat->cur_file->duration = cat->avf->duration;
283 if (++fileno >= cat->nb_files)
285 return open_file(avf, fileno);
288 static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
290 ConcatContext *cat = avf->priv_data;
295 if ((ret = av_read_frame(cat->avf, pkt)) != AVERROR_EOF ||
296 (ret = open_next_file(avf)) < 0)
302 delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time,
304 cat->avf->streams[pkt->stream_index]->time_base);
305 if (pkt->pts != AV_NOPTS_VALUE)
307 if (pkt->dts != AV_NOPTS_VALUE)
312 static void rescale_interval(AVRational tb_in, AVRational tb_out,
313 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
315 *ts = av_rescale_q (* ts, tb_in, tb_out);
316 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
317 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
318 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
319 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
322 static int try_seek(AVFormatContext *avf, int stream,
323 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
325 ConcatContext *cat = avf->priv_data;
326 int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
329 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
330 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
332 if (stream >= cat->avf->nb_streams)
334 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
335 &min_ts, &ts, &max_ts);
337 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
340 static int real_seek(AVFormatContext *avf, int stream,
341 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
343 ConcatContext *cat = avf->priv_data;
344 int ret, left, right;
347 if (stream >= avf->nb_streams)
348 return AVERROR(EINVAL);
349 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
350 &min_ts, &ts, &max_ts);
354 right = cat->nb_files;
355 while (right - left > 1) {
356 int mid = (left + right) / 2;
357 if (ts < cat->files[mid].start_time)
363 if ((ret = open_file(avf, left)) < 0)
366 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
368 left < cat->nb_files - 1 &&
369 cat->files[left + 1].start_time < max_ts) {
370 if ((ret = open_file(avf, left + 1)) < 0)
372 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
377 static int concat_seek(AVFormatContext *avf, int stream,
378 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
380 ConcatContext *cat = avf->priv_data;
381 ConcatFile *cur_file_saved = cat->cur_file;
382 AVFormatContext *cur_avf_saved = cat->avf;
386 return AVERROR(ESPIPE); /* XXX: can we use it? */
387 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
388 return AVERROR(ENOSYS);
390 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
392 avformat_close_input(&cat->avf);
393 cat->avf = cur_avf_saved;
394 cat->cur_file = cur_file_saved;
396 avformat_close_input(&cur_avf_saved);
401 #define OFFSET(x) offsetof(ConcatContext, x)
402 #define DEC AV_OPT_FLAG_DECODING_PARAM
404 static const AVOption options[] = {
405 { "safe", "enable safe mode",
406 OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
410 static const AVClass concat_class = {
411 .class_name = "concat demuxer",
412 .item_name = av_default_item_name,
414 .version = LIBAVUTIL_VERSION_INT,
418 AVInputFormat ff_concat_demuxer = {
420 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
421 .priv_data_size = sizeof(ConcatContext),
422 .read_probe = concat_probe,
423 .read_header = concat_read_header,
424 .read_packet = concat_read_packet,
425 .read_close = concat_read_close,
426 .read_seek2 = concat_seek,
427 .priv_class = &concat_class,