1 /*
2 * Copyright (c) 2012 Nicolas George
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
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 "avformat.h"
27 #include "internal.h"
28 #include "url.h"
29
30 #ifndef SIZE_MAX
31 # ifdef __SIZE_MAX__
32 # define SIZE_MAX __SIZE_MAX__
33 # else
34 # error NO SIZE_MAX
35 # endif
36 #endif
37
38 typedef enum ConcatMatchMode {
39 MATCH_ONE_TO_ONE,
40 MATCH_EXACT_ID,
41 } ConcatMatchMode;
42
43 typedef struct ConcatStream {
44 AVBitStreamFilterContext *bsf;
45 int out_stream_index;
46 } ConcatStream;
47
48 typedef struct {
49 char *url;
50 int64_t start_time;
51 int64_t duration;
52 ConcatStream *streams;
53 int nb_streams;
54 } ConcatFile;
55
56 typedef struct {
57 AVClass *class;
58 ConcatFile *files;
59 ConcatFile *cur_file;
60 unsigned nb_files;
61 AVFormatContext *avf;
62 int safe;
63 int seekable;
64 ConcatMatchMode stream_match_mode;
65 unsigned auto_convert;
66 } ConcatContext;
67
concat_probe(AVProbeData * probe)68 static int concat_probe(AVProbeData *probe)
69 {
70 return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
71 0 : AVPROBE_SCORE_MAX;
72 }
73
get_keyword(uint8_t ** cursor)74 static char *get_keyword(uint8_t **cursor)
75 {
76 char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
77 *cursor += strcspn(*cursor, SPACE_CHARS);
78 if (**cursor) {
79 *((*cursor)++) = 0;
80 *cursor += strspn(*cursor, SPACE_CHARS);
81 }
82 return ret;
83 }
84
safe_filename(const char * f)85 static int safe_filename(const char *f)
86 {
87 const char *start = f;
88
89 for (; *f; f++) {
90 /* A-Za-z0-9_- */
91 if (!((unsigned)((*f | 32) - 'a') < 26 ||
92 (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
93 if (f == start)
94 return 0;
95 else if (*f == '/')
96 start = f + 1;
97 else if (*f != '.')
98 return 0;
99 }
100 }
101 return 1;
102 }
103
104 #define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
105
add_file(AVFormatContext * avf,char * filename,ConcatFile ** rfile,unsigned * nb_files_alloc)106 static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
107 unsigned *nb_files_alloc)
108 {
109 ConcatContext *cat = avf->priv_data;
110 ConcatFile *file;
111 char *url = NULL;
112 const char *proto;
113 size_t url_len, proto_len;
114 int ret;
115
116 if (cat->safe > 0 && !safe_filename(filename)) {
117 av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
118 FAIL(AVERROR(EPERM));
119 }
120
121 proto = avio_find_protocol_name(filename);
122 proto_len = proto ? strlen(proto) : 0;
123 if (!memcmp(filename, proto, proto_len) &&
124 (filename[proto_len] == ':' || filename[proto_len] == ',')) {
125 url = filename;
126 filename = NULL;
127 } else {
128 url_len = strlen(avf->filename) + strlen(filename) + 16;
129 if (!(url = av_malloc(url_len)))
130 FAIL(AVERROR(ENOMEM));
131 ff_make_absolute_url(url, url_len, avf->filename, filename);
132 av_freep(&filename);
133 }
134
135 if (cat->nb_files >= *nb_files_alloc) {
136 size_t n = FFMAX(*nb_files_alloc * 2, 16);
137 ConcatFile *new_files;
138 if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
139 !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
140 FAIL(AVERROR(ENOMEM));
141 cat->files = new_files;
142 *nb_files_alloc = n;
143 }
144
145 file = &cat->files[cat->nb_files++];
146 memset(file, 0, sizeof(*file));
147 *rfile = file;
148
149 file->url = url;
150 file->start_time = AV_NOPTS_VALUE;
151 file->duration = AV_NOPTS_VALUE;
152
153 return 0;
154
155 fail:
156 av_free(url);
157 av_free(filename);
158 return ret;
159 }
160
copy_stream_props(AVStream * st,AVStream * source_st)161 static int copy_stream_props(AVStream *st, AVStream *source_st)
162 {
163 int ret;
164
165 if (st->codec->codec_id || !source_st->codec->codec_id) {
166 if (st->codec->extradata_size < source_st->codec->extradata_size) {
167 ret = ff_alloc_extradata(st->codec,
168 source_st->codec->extradata_size);
169 if (ret < 0)
170 return ret;
171 }
172 memcpy(st->codec->extradata, source_st->codec->extradata,
173 source_st->codec->extradata_size);
174 return 0;
175 }
176 if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
177 return ret;
178 st->r_frame_rate = source_st->r_frame_rate;
179 st->avg_frame_rate = source_st->avg_frame_rate;
180 st->time_base = source_st->time_base;
181 st->sample_aspect_ratio = source_st->sample_aspect_ratio;
182 return 0;
183 }
184
detect_stream_specific(AVFormatContext * avf,int idx)185 static int detect_stream_specific(AVFormatContext *avf, int idx)
186 {
187 ConcatContext *cat = avf->priv_data;
188 AVStream *st = cat->avf->streams[idx];
189 ConcatStream *cs = &cat->cur_file->streams[idx];
190 AVBitStreamFilterContext *bsf;
191
192 if (cat->auto_convert && st->codec->codec_id == AV_CODEC_ID_H264 &&
193 (st->codec->extradata_size < 4 || AV_RB32(st->codec->extradata) != 1)) {
194 av_log(cat->avf, AV_LOG_INFO,
195 "Auto-inserting h264_mp4toannexb bitstream filter\n");
196 if (!(bsf = av_bitstream_filter_init("h264_mp4toannexb"))) {
197 av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter "
198 "required for H.264 streams\n");
199 return AVERROR_BSF_NOT_FOUND;
200 }
201 cs->bsf = bsf;
202 }
203 return 0;
204 }
205
match_streams_one_to_one(AVFormatContext * avf)206 static int match_streams_one_to_one(AVFormatContext *avf)
207 {
208 ConcatContext *cat = avf->priv_data;
209 AVStream *st;
210 int i, ret;
211
212 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
213 if (i < avf->nb_streams) {
214 st = avf->streams[i];
215 } else {
216 if (!(st = avformat_new_stream(avf, NULL)))
217 return AVERROR(ENOMEM);
218 }
219 if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0)
220 return ret;
221 cat->cur_file->streams[i].out_stream_index = i;
222 }
223 return 0;
224 }
225
match_streams_exact_id(AVFormatContext * avf)226 static int match_streams_exact_id(AVFormatContext *avf)
227 {
228 ConcatContext *cat = avf->priv_data;
229 AVStream *st;
230 int i, j, ret;
231
232 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
233 st = cat->avf->streams[i];
234 for (j = 0; j < avf->nb_streams; j++) {
235 if (avf->streams[j]->id == st->id) {
236 av_log(avf, AV_LOG_VERBOSE,
237 "Match slave stream #%d with stream #%d id 0x%x\n",
238 i, j, st->id);
239 if ((ret = copy_stream_props(avf->streams[j], st)) < 0)
240 return ret;
241 cat->cur_file->streams[i].out_stream_index = j;
242 }
243 }
244 }
245 return 0;
246 }
247
match_streams(AVFormatContext * avf)248 static int match_streams(AVFormatContext *avf)
249 {
250 ConcatContext *cat = avf->priv_data;
251 ConcatStream *map;
252 int i, ret;
253
254 if (cat->cur_file->nb_streams >= cat->avf->nb_streams)
255 return 0;
256 map = av_realloc(cat->cur_file->streams,
257 cat->avf->nb_streams * sizeof(*map));
258 if (!map)
259 return AVERROR(ENOMEM);
260 cat->cur_file->streams = map;
261 memset(map + cat->cur_file->nb_streams, 0,
262 (cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map));
263
264 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
265 map[i].out_stream_index = -1;
266 switch (cat->stream_match_mode) {
267 case MATCH_ONE_TO_ONE:
268 ret = match_streams_one_to_one(avf);
269 break;
270 case MATCH_EXACT_ID:
271 ret = match_streams_exact_id(avf);
272 break;
273 default:
274 ret = AVERROR_BUG;
275 }
276 if (ret < 0)
277 return ret;
278 for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
279 if ((ret = detect_stream_specific(avf, i)) < 0)
280 return ret;
281 cat->cur_file->nb_streams = cat->avf->nb_streams;
282 return 0;
283 }
284
open_file(AVFormatContext * avf,unsigned fileno)285 static int open_file(AVFormatContext *avf, unsigned fileno)
286 {
287 ConcatContext *cat = avf->priv_data;
288 ConcatFile *file = &cat->files[fileno];
289 int ret;
290
291 if (cat->avf)
292 avformat_close_input(&cat->avf);
293
294 cat->avf = avformat_alloc_context();
295 if (!cat->avf)
296 return AVERROR(ENOMEM);
297
298 cat->avf->interrupt_callback = avf->interrupt_callback;
299 if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
300 (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
301 av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
302 avformat_close_input(&cat->avf);
303 return ret;
304 }
305 cat->cur_file = file;
306 if (file->start_time == AV_NOPTS_VALUE)
307 file->start_time = !fileno ? 0 :
308 cat->files[fileno - 1].start_time +
309 cat->files[fileno - 1].duration;
310 if ((ret = match_streams(avf)) < 0)
311 return ret;
312 return 0;
313 }
314
concat_read_close(AVFormatContext * avf)315 static int concat_read_close(AVFormatContext *avf)
316 {
317 ConcatContext *cat = avf->priv_data;
318 unsigned i;
319
320 if (cat->avf)
321 avformat_close_input(&cat->avf);
322 for (i = 0; i < cat->nb_files; i++) {
323 av_freep(&cat->files[i].url);
324 av_freep(&cat->files[i].streams);
325 }
326 av_freep(&cat->files);
327 return 0;
328 }
329
330 /* type pun fix */
331 typedef union {
332 uint8_t *t_uint8_t;
333 const char *t_const_char;
334 } u_uint8_cchar;
335
concat_read_header(AVFormatContext * avf)336 static int concat_read_header(AVFormatContext *avf)
337 {
338 ConcatContext *cat = avf->priv_data;
339 uint8_t buf[4096];
340 uint8_t *keyword;
341 u_uint8_cchar cursor;
342 int ret, line = 0, i;
343 unsigned nb_files_alloc = 0;
344 ConcatFile *file = NULL;
345 int64_t time = 0;
346
347 while (1) {
348 if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
349 break;
350 line++;
351 cursor.t_uint8_t = buf;
352 keyword = get_keyword(&cursor.t_uint8_t);
353 if (!*keyword || *keyword == '#')
354 continue;
355
356 if (!strcmp(keyword, "file")) {
357 char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
358 if (!filename) {
359 av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
360 FAIL(AVERROR_INVALIDDATA);
361 }
362 if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
363 goto fail;
364 } else if (!strcmp(keyword, "duration")) {
365 char *dur_str = get_keyword(&cursor.t_uint8_t);
366 int64_t dur;
367 if (!file) {
368 av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
369 line);
370 FAIL(AVERROR_INVALIDDATA);
371 }
372 if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
373 av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
374 line, dur_str);
375 goto fail;
376 }
377 file->duration = dur;
378 } else if (!strcmp(keyword, "stream")) {
379 if (!avformat_new_stream(avf, NULL))
380 FAIL(AVERROR(ENOMEM));
381 } else if (!strcmp(keyword, "exact_stream_id")) {
382 if (!avf->nb_streams) {
383 av_log(avf, AV_LOG_ERROR, "Line %d: exact_stream_id without stream\n",
384 line);
385 FAIL(AVERROR_INVALIDDATA);
386 }
387 avf->streams[avf->nb_streams - 1]->id =
388 strtol(get_keyword(&cursor.t_uint8_t), NULL, 0);
389 } else if (!strcmp(keyword, "ffconcat")) {
390 char *ver_kw = get_keyword(&cursor.t_uint8_t);
391 char *ver_val = get_keyword(&cursor.t_uint8_t);
392 if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
393 av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
394 FAIL(AVERROR_INVALIDDATA);
395 }
396 if (cat->safe < 0)
397 cat->safe = 1;
398 } else {
399 av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
400 line, keyword);
401 FAIL(AVERROR_INVALIDDATA);
402 }
403 }
404 if (ret < 0)
405 goto fail;
406 if (!cat->nb_files)
407 FAIL(AVERROR_INVALIDDATA);
408
409 for (i = 0; i < cat->nb_files; i++) {
410 if (cat->files[i].start_time == AV_NOPTS_VALUE)
411 cat->files[i].start_time = time;
412 else
413 time = cat->files[i].start_time;
414 if (cat->files[i].duration == AV_NOPTS_VALUE)
415 break;
416 time += cat->files[i].duration;
417 }
418 if (i == cat->nb_files) {
419 avf->duration = time;
420 cat->seekable = 1;
421 }
422
423 cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
424 MATCH_ONE_TO_ONE;
425 if ((ret = open_file(avf, 0)) < 0)
426 goto fail;
427 return 0;
428
429 fail:
430 concat_read_close(avf);
431 return ret;
432 }
433
open_next_file(AVFormatContext * avf)434 static int open_next_file(AVFormatContext *avf)
435 {
436 ConcatContext *cat = avf->priv_data;
437 unsigned fileno = cat->cur_file - cat->files;
438
439 if (cat->cur_file->duration == AV_NOPTS_VALUE)
440 cat->cur_file->duration = cat->avf->duration;
441
442 if (++fileno >= cat->nb_files)
443 return AVERROR_EOF;
444 return open_file(avf, fileno);
445 }
446
filter_packet(AVFormatContext * avf,ConcatStream * cs,AVPacket * pkt)447 static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt)
448 {
449 AVStream *st = avf->streams[cs->out_stream_index];
450 AVBitStreamFilterContext *bsf;
451 AVPacket pkt2;
452 int ret;
453
454 av_assert0(cs->out_stream_index >= 0);
455 for (bsf = cs->bsf; bsf; bsf = bsf->next) {
456 pkt2 = *pkt;
457 ret = av_bitstream_filter_filter(bsf, st->codec, NULL,
458 &pkt2.data, &pkt2.size,
459 pkt->data, pkt->size,
460 !!(pkt->flags & AV_PKT_FLAG_KEY));
461 if (ret < 0) {
462 av_packet_unref(pkt);
463 return ret;
464 }
465 av_assert0(pkt2.buf);
466 if (ret == 0 && pkt2.data != pkt->data) {
467 if ((ret = av_copy_packet(&pkt2, pkt)) < 0) {
468 av_free(pkt2.data);
469 return ret;
470 }
471 ret = 1;
472 }
473 if (ret > 0) {
474 av_free_packet(pkt);
475 pkt2.buf = av_buffer_create(pkt2.data, pkt2.size,
476 av_buffer_default_free, NULL, 0);
477 if (!pkt2.buf) {
478 av_free(pkt2.data);
479 return AVERROR(ENOMEM);
480 }
481 }
482 *pkt = pkt2;
483 }
484 return 0;
485 }
486
concat_read_packet(AVFormatContext * avf,AVPacket * pkt)487 static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
488 {
489 ConcatContext *cat = avf->priv_data;
490 int ret;
491 int64_t delta;
492 ConcatStream *cs;
493
494 while (1) {
495 ret = av_read_frame(cat->avf, pkt);
496 if (ret == AVERROR_EOF) {
497 if ((ret = open_next_file(avf)) < 0)
498 return ret;
499 continue;
500 }
501 if (ret < 0)
502 return ret;
503 if ((ret = match_streams(avf)) < 0) {
504 av_packet_unref(pkt);
505 return ret;
506 }
507 cs = &cat->cur_file->streams[pkt->stream_index];
508 if (cs->out_stream_index < 0) {
509 av_packet_unref(pkt);
510 continue;
511 }
512 pkt->stream_index = cs->out_stream_index;
513 break;
514 }
515 if ((ret = filter_packet(avf, cs, pkt)))
516 return ret;
517
518 delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time,
519 AV_TIME_BASE_Q,
520 cat->avf->streams[pkt->stream_index]->time_base);
521 if (pkt->pts != AV_NOPTS_VALUE)
522 pkt->pts += delta;
523 if (pkt->dts != AV_NOPTS_VALUE)
524 pkt->dts += delta;
525 return ret;
526 }
527
rescale_interval(AVRational tb_in,AVRational tb_out,int64_t * min_ts,int64_t * ts,int64_t * max_ts)528 static void rescale_interval(AVRational tb_in, AVRational tb_out,
529 int64_t *min_ts, int64_t *ts, int64_t *max_ts)
530 {
531 *ts = av_rescale_q (* ts, tb_in, tb_out);
532 *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
533 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
534 *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
535 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
536 }
537
try_seek(AVFormatContext * avf,int stream,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)538 static int try_seek(AVFormatContext *avf, int stream,
539 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
540 {
541 ConcatContext *cat = avf->priv_data;
542 int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
543
544 ts -= t0;
545 min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
546 max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
547 if (stream >= 0) {
548 if (stream >= cat->avf->nb_streams)
549 return AVERROR(EIO);
550 rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
551 &min_ts, &ts, &max_ts);
552 }
553 return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
554 }
555
real_seek(AVFormatContext * avf,int stream,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)556 static int real_seek(AVFormatContext *avf, int stream,
557 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
558 {
559 ConcatContext *cat = avf->priv_data;
560 int ret, left, right;
561
562 if (stream >= 0) {
563 if (stream >= avf->nb_streams)
564 return AVERROR(EINVAL);
565 rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
566 &min_ts, &ts, &max_ts);
567 }
568
569 left = 0;
570 right = cat->nb_files;
571 while (right - left > 1) {
572 int mid = (left + right) / 2;
573 if (ts < cat->files[mid].start_time)
574 right = mid;
575 else
576 left = mid;
577 }
578
579 if ((ret = open_file(avf, left)) < 0)
580 return ret;
581
582 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
583 if (ret < 0 &&
584 left < cat->nb_files - 1 &&
585 cat->files[left + 1].start_time < max_ts) {
586 if ((ret = open_file(avf, left + 1)) < 0)
587 return ret;
588 ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
589 }
590 return ret;
591 }
592
concat_seek(AVFormatContext * avf,int stream,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)593 static int concat_seek(AVFormatContext *avf, int stream,
594 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
595 {
596 ConcatContext *cat = avf->priv_data;
597 ConcatFile *cur_file_saved = cat->cur_file;
598 AVFormatContext *cur_avf_saved = cat->avf;
599 int ret;
600
601 if (!cat->seekable)
602 return AVERROR(ESPIPE); /* XXX: can we use it? */
603 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
604 return AVERROR(ENOSYS);
605 cat->avf = NULL;
606 if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
607 if (cat->avf)
608 avformat_close_input(&cat->avf);
609 cat->avf = cur_avf_saved;
610 cat->cur_file = cur_file_saved;
611 } else {
612 avformat_close_input(&cur_avf_saved);
613 }
614 return ret;
615 }
616
617 #define OFFSET(x) offsetof(ConcatContext, x)
618 #define DEC AV_OPT_FLAG_DECODING_PARAM
619
620 static const AVOption options[] = {
621 { "safe", "enable safe mode",
622 OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
623 { "auto_convert", "automatically convert bitstream format",
624 OFFSET(auto_convert), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
625 { NULL }
626 };
627
628 static const AVClass concat_class = {
629 .class_name = "concat demuxer",
630 .item_name = av_default_item_name,
631 .option = options,
632 .version = LIBAVUTIL_VERSION_INT,
633 };
634
635
636 AVInputFormat ff_concat_demuxer = {
637 .name = "concat",
638 .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
639 .priv_data_size = sizeof(ConcatContext),
640 .read_probe = concat_probe,
641 .read_header = concat_read_header,
642 .read_packet = concat_read_packet,
643 .read_close = concat_read_close,
644 .read_seek2 = concat_seek,
645 .priv_class = &concat_class,
646 };
647