FFmpeg
concatdec.c
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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/avstring.h"
22 #include "libavutil/avassert.h"
23 #include "libavutil/bprint.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/parseutils.h"
27 #include "libavutil/timestamp.h"
28 #include "libavcodec/bsf.h"
29 #include "avformat.h"
30 #include "avio_internal.h"
31 #include "internal.h"
32 #include "url.h"
33 
34 typedef enum ConcatMatchMode {
38 
39 typedef struct ConcatStream {
42 } ConcatStream;
43 
44 typedef struct {
45  char *url;
46  int64_t start_time;
47  int64_t file_start_time;
48  int64_t file_inpoint;
49  int64_t duration;
50  int64_t user_duration;
51  int64_t next_dts;
53  int64_t inpoint;
54  int64_t outpoint;
58 } ConcatFile;
59 
60 typedef struct {
61  AVClass *class;
64  unsigned nb_files;
66  int safe;
67  int seekable;
68  int eof;
70  unsigned auto_convert;
73 
74 static int concat_probe(const AVProbeData *probe)
75 {
76  return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
78 }
79 
80 static char *get_keyword(uint8_t **cursor)
81 {
82  char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
83  *cursor += strcspn(*cursor, SPACE_CHARS);
84  if (**cursor) {
85  *((*cursor)++) = 0;
86  *cursor += strspn(*cursor, SPACE_CHARS);
87  }
88  return ret;
89 }
90 
91 static int safe_filename(const char *f)
92 {
93  const char *start = f;
94 
95  for (; *f; f++) {
96  /* A-Za-z0-9_- */
97  if (!((unsigned)((*f | 32) - 'a') < 26 ||
98  (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
99  if (f == start)
100  return 0;
101  else if (*f == '/')
102  start = f + 1;
103  else if (*f != '.')
104  return 0;
105  }
106  }
107  return 1;
108 }
109 
110 #define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
111 
112 static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
113  unsigned *nb_files_alloc)
114 {
115  ConcatContext *cat = avf->priv_data;
116  ConcatFile *file;
117  char *url = NULL;
118  const char *proto;
119  const char *ptr;
120  size_t url_len;
121  int ret;
122 
123  if (cat->safe && !safe_filename(filename)) {
124  av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
125  FAIL(AVERROR(EPERM));
126  }
127 
128  proto = avio_find_protocol_name(filename);
129  if (proto && av_strstart(filename, proto, &ptr) &&
130  (*ptr == ':' || *ptr == ',')) {
131  url = filename;
132  filename = NULL;
133  } else {
134  url_len = strlen(avf->url) + strlen(filename) + 16;
135  if (!(url = av_malloc(url_len)))
136  FAIL(AVERROR(ENOMEM));
137  ff_make_absolute_url(url, url_len, avf->url, filename);
138  av_freep(&filename);
139  }
140 
141  if (cat->nb_files >= *nb_files_alloc) {
142  size_t n = FFMAX(*nb_files_alloc * 2, 16);
143  ConcatFile *new_files;
144  if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
145  !(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
146  FAIL(AVERROR(ENOMEM));
147  cat->files = new_files;
148  *nb_files_alloc = n;
149  }
150 
151  file = &cat->files[cat->nb_files++];
152  memset(file, 0, sizeof(*file));
153  *rfile = file;
154 
155  file->url = url;
156  file->start_time = AV_NOPTS_VALUE;
157  file->duration = AV_NOPTS_VALUE;
158  file->next_dts = AV_NOPTS_VALUE;
159  file->inpoint = AV_NOPTS_VALUE;
160  file->outpoint = AV_NOPTS_VALUE;
162 
163  return 0;
164 
165 fail:
166  av_free(url);
167  av_free(filename);
168  return ret;
169 }
170 
171 static int copy_stream_props(AVStream *st, AVStream *source_st)
172 {
173  int ret;
174 
175  if (st->codecpar->codec_id || !source_st->codecpar->codec_id) {
176  if (st->codecpar->extradata_size < source_st->codecpar->extradata_size) {
178  source_st->codecpar->extradata_size);
179  if (ret < 0)
180  return ret;
181  }
182  memcpy(st->codecpar->extradata, source_st->codecpar->extradata,
183  source_st->codecpar->extradata_size);
184  return 0;
185  }
186  if ((ret = avcodec_parameters_copy(st->codecpar, source_st->codecpar)) < 0)
187  return ret;
188  st->r_frame_rate = source_st->r_frame_rate;
189  st->avg_frame_rate = source_st->avg_frame_rate;
190  st->sample_aspect_ratio = source_st->sample_aspect_ratio;
191  avpriv_set_pts_info(st, 64, source_st->time_base.num, source_st->time_base.den);
192 
193  av_dict_copy(&st->metadata, source_st->metadata, 0);
194  return 0;
195 }
196 
197 static int detect_stream_specific(AVFormatContext *avf, int idx)
198 {
199  ConcatContext *cat = avf->priv_data;
200  AVStream *st = cat->avf->streams[idx];
201  ConcatStream *cs = &cat->cur_file->streams[idx];
202  const AVBitStreamFilter *filter;
203  AVBSFContext *bsf;
204  int ret;
205 
206  if (cat->auto_convert && st->codecpar->codec_id == AV_CODEC_ID_H264) {
207  if (!st->codecpar->extradata_size ||
208  (st->codecpar->extradata_size >= 3 && AV_RB24(st->codecpar->extradata) == 1) ||
209  (st->codecpar->extradata_size >= 4 && AV_RB32(st->codecpar->extradata) == 1))
210  return 0;
211  av_log(cat->avf, AV_LOG_INFO,
212  "Auto-inserting h264_mp4toannexb bitstream filter\n");
213  filter = av_bsf_get_by_name("h264_mp4toannexb");
214  if (!filter) {
215  av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter "
216  "required for H.264 streams\n");
217  return AVERROR_BSF_NOT_FOUND;
218  }
219  ret = av_bsf_alloc(filter, &bsf);
220  if (ret < 0)
221  return ret;
222  cs->bsf = bsf;
223 
225  if (ret < 0)
226  return ret;
227 
228  ret = av_bsf_init(bsf);
229  if (ret < 0)
230  return ret;
231 
233  if (ret < 0)
234  return ret;
235  }
236  return 0;
237 }
238 
240 {
241  ConcatContext *cat = avf->priv_data;
242  AVStream *st;
243  int i, ret;
244 
245  for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
246  if (i < avf->nb_streams) {
247  st = avf->streams[i];
248  } else {
249  if (!(st = avformat_new_stream(avf, NULL)))
250  return AVERROR(ENOMEM);
251  }
252  if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0)
253  return ret;
254  cat->cur_file->streams[i].out_stream_index = i;
255  }
256  return 0;
257 }
258 
260 {
261  ConcatContext *cat = avf->priv_data;
262  AVStream *st;
263  int i, j, ret;
264 
265  for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
266  st = cat->avf->streams[i];
267  for (j = 0; j < avf->nb_streams; j++) {
268  if (avf->streams[j]->id == st->id) {
269  av_log(avf, AV_LOG_VERBOSE,
270  "Match slave stream #%d with stream #%d id 0x%x\n",
271  i, j, st->id);
272  if ((ret = copy_stream_props(avf->streams[j], st)) < 0)
273  return ret;
274  cat->cur_file->streams[i].out_stream_index = j;
275  }
276  }
277  }
278  return 0;
279 }
280 
282 {
283  ConcatContext *cat = avf->priv_data;
284  ConcatStream *map;
285  int i, ret;
286 
287  if (cat->cur_file->nb_streams >= cat->avf->nb_streams)
288  return 0;
289  map = av_realloc(cat->cur_file->streams,
290  cat->avf->nb_streams * sizeof(*map));
291  if (!map)
292  return AVERROR(ENOMEM);
293  cat->cur_file->streams = map;
294  memset(map + cat->cur_file->nb_streams, 0,
295  (cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map));
296 
297  for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
298  map[i].out_stream_index = -1;
299  if ((ret = detect_stream_specific(avf, i)) < 0)
300  return ret;
301  }
302  switch (cat->stream_match_mode) {
303  case MATCH_ONE_TO_ONE:
305  break;
306  case MATCH_EXACT_ID:
308  break;
309  default:
310  ret = AVERROR_BUG;
311  }
312  if (ret < 0)
313  return ret;
314  cat->cur_file->nb_streams = cat->avf->nb_streams;
315  return 0;
316 }
317 
319 {
320  if (file->user_duration != AV_NOPTS_VALUE)
321  return file->user_duration;
322  if (file->outpoint != AV_NOPTS_VALUE)
323  return file->outpoint - file->file_inpoint;
324  if (avf->duration > 0)
325  return avf->duration - (file->file_inpoint - file->file_start_time);
326  if (file->next_dts != AV_NOPTS_VALUE)
327  return file->next_dts - file->file_inpoint;
328  return AV_NOPTS_VALUE;
329 }
330 
331 static int open_file(AVFormatContext *avf, unsigned fileno)
332 {
333  ConcatContext *cat = avf->priv_data;
334  ConcatFile *file = &cat->files[fileno];
336  int ret;
337 
338  if (cat->avf)
339  avformat_close_input(&cat->avf);
340 
341  cat->avf = avformat_alloc_context();
342  if (!cat->avf)
343  return AVERROR(ENOMEM);
344 
345  cat->avf->flags |= avf->flags & ~AVFMT_FLAG_CUSTOM_IO;
346  cat->avf->interrupt_callback = avf->interrupt_callback;
347 
348  if ((ret = ff_copy_whiteblacklists(cat->avf, avf)) < 0)
349  return ret;
350 
351  ret = av_dict_copy(&options, file->options, 0);
352  if (ret < 0)
353  return ret;
354 
355  if ((ret = avformat_open_input(&cat->avf, file->url, NULL, &options)) < 0 ||
356  (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
357  av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
359  avformat_close_input(&cat->avf);
360  return ret;
361  }
362  if (options) {
363  av_log(avf, AV_LOG_WARNING, "Unused options for '%s'.\n", file->url);
364  /* TODO log unused options once we have a proper string API */
366  }
367  cat->cur_file = file;
368  file->start_time = !fileno ? 0 :
369  cat->files[fileno - 1].start_time +
370  cat->files[fileno - 1].duration;
371  file->file_start_time = (cat->avf->start_time == AV_NOPTS_VALUE) ? 0 : cat->avf->start_time;
372  file->file_inpoint = (file->inpoint == AV_NOPTS_VALUE) ? file->file_start_time : file->inpoint;
373  file->duration = get_best_effort_duration(file, cat->avf);
374 
375  if (cat->segment_time_metadata) {
376  av_dict_set_int(&file->metadata, "lavf.concatdec.start_time", file->start_time, 0);
377  if (file->duration != AV_NOPTS_VALUE)
378  av_dict_set_int(&file->metadata, "lavf.concatdec.duration", file->duration, 0);
379  }
380 
381  if ((ret = match_streams(avf)) < 0)
382  return ret;
383  if (file->inpoint != AV_NOPTS_VALUE) {
384  if ((ret = avformat_seek_file(cat->avf, -1, INT64_MIN, file->inpoint, file->inpoint, 0)) < 0)
385  return ret;
386  }
387  return 0;
388 }
389 
391 {
392  ConcatContext *cat = avf->priv_data;
393  unsigned i, j;
394 
395  for (i = 0; i < cat->nb_files; i++) {
396  av_freep(&cat->files[i].url);
397  for (j = 0; j < cat->files[i].nb_streams; j++) {
398  if (cat->files[i].streams[j].bsf)
399  av_bsf_free(&cat->files[i].streams[j].bsf);
400  }
401  av_freep(&cat->files[i].streams);
402  av_dict_free(&cat->files[i].metadata);
403  av_dict_free(&cat->files[i].options);
404  }
405  if (cat->avf)
406  avformat_close_input(&cat->avf);
407  av_freep(&cat->files);
408  return 0;
409 }
410 
411 #define MAX_ARGS 3
412 #define NEEDS_UNSAFE (1 << 1)
413 #define NEEDS_FILE (1 << 1)
414 #define NEEDS_STREAM (1 << 2)
415 
416 typedef struct ParseSyntax {
417  const char *keyword;
418  char args[MAX_ARGS];
419  uint8_t flags;
420 } ParseSyntax;
421 
422 typedef enum ParseDirective {
438 
439 static const ParseSyntax syntax[] = {
440  [DIR_FFCONCAT ] = { "ffconcat", "kk", 0 },
441  [DIR_FILE ] = { "file", "s", 0 },
442  [DIR_DURATION ] = { "duration", "d", NEEDS_FILE },
443  [DIR_INPOINT ] = { "inpoint", "d", NEEDS_FILE },
444  [DIR_OUTPOINT ] = { "outpoint", "d", NEEDS_FILE },
445  [DIR_FPMETA ] = { "file_packet_meta", "ks", NEEDS_FILE },
446  [DIR_FPMETAS ] = { "file_packet_metadata", "s", NEEDS_FILE },
447  [DIR_OPTION ] = { "option", "ks", NEEDS_FILE | NEEDS_UNSAFE },
448  [DIR_STREAM ] = { "stream", "", 0 },
449  [DIR_EXSID ] = { "exact_stream_id", "i", NEEDS_STREAM },
450  [DIR_STMETA ] = { "stream_meta", "ks", NEEDS_STREAM },
451  [DIR_STCODEC ] = { "stream_codec", "k", NEEDS_STREAM },
452  [DIR_STEDATA ] = { "stream_extradata", "k", NEEDS_STREAM },
453  [DIR_CHAPTER ] = { "chapter", "idd", 0 },
454 };
455 
457 {
458  ConcatContext *cat = avf->priv_data;
459  unsigned nb_files_alloc = 0;
460  AVBPrint bp;
461  uint8_t *cursor, *keyword;
462  ConcatFile *file = NULL;
463  AVStream *stream = NULL;
464  AVChapter *chapter = NULL;
465  unsigned line = 0, arg;
466  const ParseSyntax *dir;
467  char *arg_kw[MAX_ARGS];
468  char *arg_str[MAX_ARGS] = { 0 };
469  int64_t arg_int[MAX_ARGS];
470  int ret;
471 
473 
474  while ((ret = ff_read_line_to_bprint_overwrite(avf->pb, &bp)) >= 0) {
475  line++;
476  cursor = bp.str;
477  keyword = get_keyword(&cursor);
478  if (!*keyword || *keyword == '#')
479  continue;
480  for (dir = syntax; dir < syntax + FF_ARRAY_ELEMS(syntax); dir++)
481  if (!strcmp(dir->keyword, keyword))
482  break;
483  if (dir >= syntax + FF_ARRAY_ELEMS(syntax)) {
484  av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
485  line, keyword);
487  }
488 
489  /* Flags check */
490  if ((dir->flags & NEEDS_UNSAFE) && cat->safe) {
491  av_log(avf, AV_LOG_ERROR, "Line %d: %s not allowed if safe\n", line, keyword);
493  }
494  if ((dir->flags & NEEDS_FILE) && !cat->nb_files) {
495  av_log(avf, AV_LOG_ERROR, "Line %d: %s without file\n", line, keyword);
497  }
498  if ((dir->flags & NEEDS_STREAM) && !avf->nb_streams) {
499  av_log(avf, AV_LOG_ERROR, "Line %d: %s without stream\n", line, keyword);
501  }
502 
503  /* Arguments parsing */
504  for (arg = 0; arg < FF_ARRAY_ELEMS(dir->args) && dir->args[arg]; arg++) {
505  switch (dir->args[arg]) {
506  case 'd': /* duration */
507  arg_kw[arg] = get_keyword(&cursor);
508  ret = av_parse_time(&arg_int[arg], arg_kw[arg], 1);
509  if (ret < 0) {
510  av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
511  line, arg_kw[arg]);
512  goto fail;
513  }
514  break;
515  case 'i': /* integer */
516  arg_int[arg] = strtol(get_keyword(&cursor), NULL, 0);
517  break;
518  case 'k': /* keyword */
519  arg_kw[arg] = get_keyword(&cursor);
520  break;
521  case 's': /* string */
522  av_assert0(!arg_str[arg]);
523  arg_str[arg] = av_get_token((const char **)&cursor, SPACE_CHARS);
524  if (!arg_str[arg])
525  FAIL(AVERROR(ENOMEM));
526  if (!*arg_str[arg]) {
527  av_log(avf, AV_LOG_ERROR, "Line %d: string required\n", line);
529  }
530  break;
531  default:
532  FAIL(AVERROR_BUG);
533  }
534  }
535 
536  /* Directive action */
537  switch ((ParseDirective)(dir - syntax)) {
538 
539  case DIR_FFCONCAT:
540  if (strcmp(arg_kw[0], "version") || strcmp(arg_kw[1], "1.0")) {
541  av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
543  }
544  break;
545 
546  case DIR_FILE:
547  ret = add_file(avf, arg_str[0], &file, &nb_files_alloc);
548  arg_str[0] = NULL;
549  if (ret < 0)
550  goto fail;
551  break;
552 
553  case DIR_DURATION:
554  file->user_duration = arg_int[0];
555  break;
556 
557  case DIR_INPOINT:
558  file->inpoint = arg_int[0];
559  break;
560 
561  case DIR_OUTPOINT:
562  file->outpoint = arg_int[0];
563  break;
564 
565  case DIR_FPMETA:
566  ret = av_dict_set(&file->metadata, arg_kw[0], arg_str[1], AV_DICT_DONT_STRDUP_VAL);
567  arg_str[1] = NULL;
568  if (ret < 0)
569  FAIL(ret);
570  break;
571 
572  case DIR_FPMETAS:
573  if ((ret = av_dict_parse_string(&file->metadata, arg_str[0], "=", "", 0)) < 0) {
574  av_log(avf, AV_LOG_ERROR, "Line %d: failed to parse metadata string\n", line);
576  }
577  av_log(avf, AV_LOG_WARNING,
578  "'file_packet_metadata key=value:key=value' is deprecated, "
579  "use multiple 'file_packet_meta key value' instead\n");
580  av_freep(&arg_str[0]);
581  break;
582 
583  case DIR_OPTION:
584  ret = av_dict_set(&file->options, arg_kw[0], arg_str[1], AV_DICT_DONT_STRDUP_VAL);
585  arg_str[1] = NULL;
586  if (ret < 0)
587  FAIL(ret);
588  break;
589 
590  case DIR_STREAM:
591  stream = avformat_new_stream(avf, NULL);
592  if (!stream)
593  FAIL(AVERROR(ENOMEM));
594  break;
595 
596  case DIR_EXSID:
597  stream->id = arg_int[0];
598  break;
599  case DIR_STMETA:
600  ret = av_dict_set(&stream->metadata, arg_kw[0], arg_str[1], AV_DICT_DONT_STRDUP_VAL);
601  arg_str[1] = NULL;
602  if (ret < 0)
603  FAIL(ret);
604  break;
605 
606  case DIR_STCODEC: {
607  const AVCodecDescriptor *codec = avcodec_descriptor_get_by_name(arg_kw[0]);
608  if (!codec) {
609  av_log(avf, AV_LOG_ERROR, "Line %d: codec '%s' not found\n", line, arg_kw[0]);
611  }
612  stream->codecpar->codec_type = codec->type;
613  stream->codecpar->codec_id = codec->id;
614  break;
615  }
616 
617  case DIR_STEDATA: {
618  int size = ff_hex_to_data(NULL, arg_kw[0]);
619  ret = ff_alloc_extradata(stream->codecpar, size);
620  if (ret < 0)
621  FAIL(ret);
622  ff_hex_to_data(stream->codecpar->extradata, arg_kw[0]);
623  break;
624  }
625 
626  case DIR_CHAPTER:
627  chapter = avpriv_new_chapter(avf, arg_int[0], AV_TIME_BASE_Q,
628  arg_int[1], arg_int[2], NULL);
629  if (!chapter)
630  return AVERROR(ENOMEM);
631  break;
632 
633  default:
634  FAIL(AVERROR_BUG);
635  }
636  }
637 
638 fail:
639  for (arg = 0; arg < MAX_ARGS; arg++)
640  av_freep(&arg_str[arg]);
641  av_bprint_finalize(&bp, NULL);
642  return ret == AVERROR_EOF ? 0 : ret;
643 }
644 
646 {
647  ConcatContext *cat = avf->priv_data;
648  int64_t time = 0;
649  unsigned i;
650  int ret;
651 
652  ret = concat_parse_script(avf);
653  if (ret < 0)
654  return ret;
655  if (!cat->nb_files) {
656  av_log(avf, AV_LOG_ERROR, "No files to concat\n");
657  return AVERROR_INVALIDDATA;
658  }
659 
660  for (i = 0; i < cat->nb_files; i++) {
661  if (cat->files[i].start_time == AV_NOPTS_VALUE)
662  cat->files[i].start_time = time;
663  else
664  time = cat->files[i].start_time;
665  if (cat->files[i].user_duration == AV_NOPTS_VALUE) {
666  if (cat->files[i].inpoint == AV_NOPTS_VALUE || cat->files[i].outpoint == AV_NOPTS_VALUE)
667  break;
668  cat->files[i].user_duration = cat->files[i].outpoint - cat->files[i].inpoint;
669  }
670  cat->files[i].duration = cat->files[i].user_duration;
671  time += cat->files[i].user_duration;
672  }
673  if (i == cat->nb_files) {
674  avf->duration = time;
675  cat->seekable = 1;
676  }
677 
678  cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
680  if ((ret = open_file(avf, 0)) < 0)
681  return ret;
682 
683  return 0;
684 }
685 
687 {
688  ConcatContext *cat = avf->priv_data;
689  unsigned fileno = cat->cur_file - cat->files;
690 
691  cat->cur_file->duration = get_best_effort_duration(cat->cur_file, cat->avf);
692 
693  if (++fileno >= cat->nb_files) {
694  cat->eof = 1;
695  return AVERROR_EOF;
696  }
697  return open_file(avf, fileno);
698 }
699 
701 {
702  int ret;
703 
704  if (cs->bsf) {
705  ret = av_bsf_send_packet(cs->bsf, pkt);
706  if (ret < 0) {
707  av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb filter "
708  "failed to send input packet\n");
709  return ret;
710  }
711 
712  while (!ret)
714 
715  if (ret < 0 && (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)) {
716  av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb filter "
717  "failed to receive output packet\n");
718  return ret;
719  }
720  }
721  return 0;
722 }
723 
724 /* Returns true if the packet dts is greater or equal to the specified outpoint. */
726 {
727  if (cat->cur_file->outpoint != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE) {
728  return av_compare_ts(pkt->dts, cat->avf->streams[pkt->stream_index]->time_base,
729  cat->cur_file->outpoint, AV_TIME_BASE_Q) >= 0;
730  }
731  return 0;
732 }
733 
735 {
736  ConcatContext *cat = avf->priv_data;
737  int ret;
738  int64_t delta;
739  ConcatStream *cs;
740  AVStream *st;
741  FFStream *sti;
742 
743  if (cat->eof)
744  return AVERROR_EOF;
745 
746  if (!cat->avf)
747  return AVERROR(EIO);
748 
749  while (1) {
750  ret = av_read_frame(cat->avf, pkt);
751  if (ret == AVERROR_EOF) {
752  if ((ret = open_next_file(avf)) < 0)
753  return ret;
754  continue;
755  }
756  if (ret < 0)
757  return ret;
758  if ((ret = match_streams(avf)) < 0) {
759  return ret;
760  }
761  if (packet_after_outpoint(cat, pkt)) {
763  if ((ret = open_next_file(avf)) < 0)
764  return ret;
765  continue;
766  }
767  cs = &cat->cur_file->streams[pkt->stream_index];
768  if (cs->out_stream_index < 0) {
770  continue;
771  }
772  break;
773  }
774  if ((ret = filter_packet(avf, cs, pkt)) < 0)
775  return ret;
776 
777  st = cat->avf->streams[pkt->stream_index];
778  sti = ffstream(st);
779  av_log(avf, AV_LOG_DEBUG, "file:%d stream:%d pts:%s pts_time:%s dts:%s dts_time:%s",
780  (unsigned)(cat->cur_file - cat->files), pkt->stream_index,
783 
784  delta = av_rescale_q(cat->cur_file->start_time - cat->cur_file->file_inpoint,
786  cat->avf->streams[pkt->stream_index]->time_base);
787  if (pkt->pts != AV_NOPTS_VALUE)
788  pkt->pts += delta;
789  if (pkt->dts != AV_NOPTS_VALUE)
790  pkt->dts += delta;
791  av_log(avf, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
794  if (cat->cur_file->metadata) {
795  size_t metadata_len;
796  char* packed_metadata = av_packet_pack_dictionary(cat->cur_file->metadata, &metadata_len);
797  if (!packed_metadata)
798  return AVERROR(ENOMEM);
800  packed_metadata, metadata_len);
801  if (ret < 0) {
802  av_freep(&packed_metadata);
803  return ret;
804  }
805  }
806 
807  if (cat->cur_file->duration == AV_NOPTS_VALUE && sti->cur_dts != AV_NOPTS_VALUE) {
808  int64_t next_dts = av_rescale_q(sti->cur_dts, st->time_base, AV_TIME_BASE_Q);
809  if (cat->cur_file->next_dts == AV_NOPTS_VALUE || next_dts > cat->cur_file->next_dts) {
810  cat->cur_file->next_dts = next_dts;
811  }
812  }
813 
815  return 0;
816 }
817 
818 static void rescale_interval(AVRational tb_in, AVRational tb_out,
819  int64_t *min_ts, int64_t *ts, int64_t *max_ts)
820 {
821  *ts = av_rescale_q (* ts, tb_in, tb_out);
822  *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
824  *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
826 }
827 
828 static int try_seek(AVFormatContext *avf, int stream,
829  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
830 {
831  ConcatContext *cat = avf->priv_data;
832  int64_t t0 = cat->cur_file->start_time - cat->cur_file->file_inpoint;
833 
834  ts -= t0;
835  min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
836  max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
837  if (stream >= 0) {
838  if (stream >= cat->avf->nb_streams)
839  return AVERROR(EIO);
840  rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
841  &min_ts, &ts, &max_ts);
842  }
843  return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
844 }
845 
846 static int real_seek(AVFormatContext *avf, int stream,
847  int64_t min_ts, int64_t ts, int64_t max_ts, int flags, AVFormatContext *cur_avf)
848 {
849  ConcatContext *cat = avf->priv_data;
850  int ret, left, right;
851 
852  if (stream >= 0) {
853  if (stream >= avf->nb_streams)
854  return AVERROR(EINVAL);
856  &min_ts, &ts, &max_ts);
857  }
858 
859  left = 0;
860  right = cat->nb_files;
861 
862  /* Always support seek to start */
863  if (ts <= 0)
864  right = 1;
865  else if (!cat->seekable)
866  return AVERROR(ESPIPE); /* XXX: can we use it? */
867 
868  while (right - left > 1) {
869  int mid = (left + right) / 2;
870  if (ts < cat->files[mid].start_time)
871  right = mid;
872  else
873  left = mid;
874  }
875 
876  if (cat->cur_file != &cat->files[left]) {
877  if ((ret = open_file(avf, left)) < 0)
878  return ret;
879  } else {
880  cat->avf = cur_avf;
881  }
882 
883  ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
884  if (ret < 0 &&
885  left < cat->nb_files - 1 &&
886  cat->files[left + 1].start_time < max_ts) {
887  if (cat->cur_file == &cat->files[left])
888  cat->avf = NULL;
889  if ((ret = open_file(avf, left + 1)) < 0)
890  return ret;
891  ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
892  }
893  return ret;
894 }
895 
896 static int concat_seek(AVFormatContext *avf, int stream,
897  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
898 {
899  ConcatContext *cat = avf->priv_data;
900  ConcatFile *cur_file_saved = cat->cur_file;
901  AVFormatContext *cur_avf_saved = cat->avf;
902  int ret;
903 
905  return AVERROR(ENOSYS);
906  cat->avf = NULL;
907  if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags, cur_avf_saved)) < 0) {
908  if (cat->cur_file != cur_file_saved) {
909  if (cat->avf)
910  avformat_close_input(&cat->avf);
911  }
912  cat->avf = cur_avf_saved;
913  cat->cur_file = cur_file_saved;
914  } else {
915  if (cat->cur_file != cur_file_saved) {
916  avformat_close_input(&cur_avf_saved);
917  }
918  cat->eof = 0;
919  }
920  return ret;
921 }
922 
923 #define OFFSET(x) offsetof(ConcatContext, x)
924 #define DEC AV_OPT_FLAG_DECODING_PARAM
925 
926 static const AVOption options[] = {
927  { "safe", "enable safe mode",
928  OFFSET(safe), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, DEC },
929  { "auto_convert", "automatically convert bitstream format",
930  OFFSET(auto_convert), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, DEC },
931  { "segment_time_metadata", "output file segment start time and duration as packet metadata",
932  OFFSET(segment_time_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
933  { NULL }
934 };
935 
936 static const AVClass concat_class = {
937  .class_name = "concat demuxer",
938  .item_name = av_default_item_name,
939  .option = options,
940  .version = LIBAVUTIL_VERSION_INT,
941 };
942 
943 
945  .name = "concat",
946  .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
947  .priv_data_size = sizeof(ConcatContext),
948  .flags_internal = FF_FMT_INIT_CLEANUP,
953  .read_seek2 = concat_seek,
954  .priv_class = &concat_class,
955 };
add_file
static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile, unsigned *nb_files_alloc)
Definition: concatdec.c:112
real_seek
static int real_seek(AVFormatContext *avf, int stream, int64_t min_ts, int64_t ts, int64_t max_ts, int flags, AVFormatContext *cur_avf)
Definition: concatdec.c:846
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:417
AVBSFContext::par_in
AVCodecParameters * par_in
Parameters of the input stream.
Definition: bsf.h:69
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
DIR_FPMETA
@ DIR_FPMETA
Definition: concatdec.c:428
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
OFFSET
#define OFFSET(x)
Definition: concatdec.c:923
FF_FMT_INIT_CLEANUP
#define FF_FMT_INIT_CLEANUP
For an AVInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: internal.h:48
packet_after_outpoint
static int packet_after_outpoint(ConcatContext *cat, AVPacket *pkt)
Definition: concatdec.c:725
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:724
ConcatFile::duration
int64_t duration
Definition: concatdec.c:49
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
NEEDS_FILE
#define NEEDS_FILE
Definition: concatdec.c:413
av_compare_ts
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
Compare two timestamps each in its own time base.
Definition: mathematics.c:146
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:234
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2154
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:68
av_get_token
char * av_get_token(const char **buf, const char *term)
Unescape the given string until a non escaped terminating char, and return the token corresponding to...
Definition: avstring.c:151
ConcatContext::segment_time_metadata
int segment_time_metadata
Definition: concatdec.c:71
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
ConcatFile::next_dts
int64_t next_dts
Definition: concatdec.c:51
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
get_best_effort_duration
static int64_t get_best_effort_duration(ConcatFile *file, AVFormatContext *avf)
Definition: concatdec.c:318
av_bsf_init
int av_bsf_init(AVBSFContext *ctx)
Prepare the filter for use, after all the parameters and options have been set.
Definition: bsf.c:145
ConcatFile::file_inpoint
int64_t file_inpoint
Definition: concatdec.c:48
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1165
ff_read_line_to_bprint_overwrite
int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp)
Read a whole line of text from AVIOContext to an AVBPrint buffer overwriting its contents.
Definition: aviobuf.c:837
AVOption
AVOption.
Definition: opt.h:247
t0
#define t0
Definition: regdef.h:28
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:912
AVFMT_FLAG_CUSTOM_IO
#define AVFMT_FLAG_CUSTOM_IO
The caller has supplied a custom AVIOContext, don't avio_close() it.
Definition: avformat.h:1223
ConcatContext::stream_match_mode
ConcatMatchMode stream_match_mode
Definition: concatdec.c:69
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2152
open_next_file
static int open_next_file(AVFormatContext *avf)
Definition: concatdec.c:686
DIR_FFCONCAT
@ DIR_FFCONCAT
Definition: concatdec.c:423
concat_parse_script
static int concat_parse_script(AVFormatContext *avf)
Definition: concatdec.c:456
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
concat_probe
static int concat_probe(const AVProbeData *probe)
Definition: concatdec.c:74
cat
#define cat(a, bpp, b)
Definition: vp9dsp_init.h:32
ConcatContext::nb_files
unsigned nb_files
Definition: concatdec.c:64
filter
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce then the filter should push the output frames on the output link immediately As an exception to the previous rule if the input frame is enough to produce several output frames then the filter needs output only at least one per link The additional frames can be left buffered in the filter
Definition: filter_design.txt:228
AVDictionary
Definition: dict.c:30
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
MAX_ARGS
#define MAX_ARGS
Definition: concatdec.c:411
av_read_frame
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: demux.c:1414
DIR_OPTION
@ DIR_OPTION
Definition: concatdec.c:430
AVBSFContext
The bitstream filter state.
Definition: bsf.h:47
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
av_bsf_get_by_name
const AVBitStreamFilter * av_bsf_get_by_name(const char *name)
Definition: bitstream_filters.c:78
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: demux.c:355
AVFormatContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1364
bsf.h
av_packet_add_side_data
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type, uint8_t *data, size_t size)
Wrap an existing array as a packet side data.
Definition: avpacket.c:191
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:426
fail
#define fail()
Definition: checkasm.h:127
concat_read_header
static int concat_read_header(AVFormatContext *avf)
Definition: concatdec.c:645
match_streams_exact_id
static int match_streams_exact_id(AVFormatContext *avf)
Definition: concatdec.c:259
ParseSyntax::keyword
const char * keyword
Definition: concatdec.c:417
filter_packet
static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt)
Definition: concatdec.c:700
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:141
ConcatFile::outpoint
int64_t outpoint
Definition: concatdec.c:54
AVChapter
Definition: avformat.h:1056
AV_ROUND_UP
@ AV_ROUND_UP
Round toward +infinity.
Definition: mathematics.h:83
AVBSFContext::par_out
AVCodecParameters * par_out
Parameters of the output stream.
Definition: bsf.h:75
concat_read_packet
static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
Definition: concatdec.c:734
AVRational::num
int num
Numerator.
Definition: rational.h:59
SPACE_CHARS
#define SPACE_CHARS
Definition: dnn_backend_tf.c:359
DIR_FPMETAS
@ DIR_FPMETAS
Definition: concatdec.c:429
AV_DICT_DONT_STRDUP_VAL
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:72
AV_PKT_DATA_STRINGS_METADATA
@ AV_PKT_DATA_STRINGS_METADATA
A list of zero terminated key/value strings.
Definition: packet.h:172
ConcatFile::streams
ConcatStream * streams
Definition: concatdec.c:52
avassert.h
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:626
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
get_keyword
static char * get_keyword(uint8_t **cursor)
Definition: concatdec.c:80
ConcatFile::file_start_time
int64_t file_start_time
Definition: concatdec.c:47
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: demux.c:207
AVCodecDescriptor
This struct describes the properties of a single codec described by an AVCodecID.
Definition: codec_desc.h:38
intreadwrite.h
copy_stream_props
static int copy_stream_props(AVStream *st, AVStream *source_st)
Definition: concatdec.c:171
AVFormatContext::flags
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1215
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AVCodecDescriptor::type
enum AVMediaType type
Definition: codec_desc.h:40
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
nb_streams
static int nb_streams
Definition: ffprobe.c:289
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:141
ConcatFile::inpoint
int64_t inpoint
Definition: concatdec.c:53
f
#define f(width, name)
Definition: cbs_vp9.c:255
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:77
ff_hex_to_data
int ff_hex_to_data(uint8_t *data, const char *p)
Parse a string of hexadecimal strings.
Definition: utils.c:1118
arg
const char * arg
Definition: jacosubdec.c:67
MATCH_ONE_TO_ONE
@ MATCH_ONE_TO_ONE
Definition: concatdec.c:35
ParseSyntax
Definition: concatdec.c:416
NEEDS_UNSAFE
#define NEEDS_UNSAFE
Definition: concatdec.c:412
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
options
static const AVOption options[]
Definition: concatdec.c:926
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
open_file
static int open_file(AVFormatContext *avf, unsigned fileno)
Definition: concatdec.c:331
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:868
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1139
AVERROR_BSF_NOT_FOUND
#define AVERROR_BSF_NOT_FOUND
Bitstream filter not found.
Definition: error.h:51
parseutils.h
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVStream::metadata
AVDictionary * metadata
Definition: avformat.h:903
av_parse_time
int av_parse_time(int64_t *timeval, const char *timestr, int duration)
Parse timestr and return in *time a corresponding number of microseconds.
Definition: parseutils.c:587
DIR_STEDATA
@ DIR_STEDATA
Definition: concatdec.c:435
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1153
avformat_find_stream_info
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: demux.c:2396
ConcatContext::avf
AVFormatContext * avf
Definition: concatdec.c:65
DIR_EXSID
@ DIR_EXSID
Definition: concatdec.c:432
av_ts2timestr
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:76
NEEDS_STREAM
#define NEEDS_STREAM
Definition: concatdec.c:414
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:154
FFStream
Definition: internal.h:188
ConcatStream
Definition: concatdec.c:39
try_seek
static int try_seek(AVFormatContext *avf, int stream, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: concatdec.c:828
ParseSyntax::args
char args[MAX_ARGS]
Definition: concatdec.c:418
start_time
static int64_t start_time
Definition: ffplay.c:330
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1180
ff_copy_whiteblacklists
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:114
size
int size
Definition: twinvq_data.h:10344
DIR_OUTPOINT
@ DIR_OUTPOINT
Definition: concatdec.c:427
ConcatStream::out_stream_index
int out_stream_index
Definition: concatdec.c:41
avformat_seek_file
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Seek to timestamp ts.
Definition: seek.c:656
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
ConcatContext::auto_convert
unsigned auto_convert
Definition: concatdec.c:70
match_streams_one_to_one
static int match_streams_one_to_one(AVFormatContext *avf)
Definition: concatdec.c:239
DIR_STMETA
@ DIR_STMETA
Definition: concatdec.c:433
concat_class
static const AVClass concat_class
Definition: concatdec.c:936
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:901
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:372
FAIL
#define FAIL(retcode)
Definition: concatdec.c:110
line
Definition: graph2dot.c:48
av_packet_pack_dictionary
uint8_t * av_packet_pack_dictionary(AVDictionary *dict, size_t *size)
Pack a dictionary for use in side_data.
Definition: avpacket.c:302
av_dict_free
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
Definition: dict.c:203
av_strstart
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
DIR_DURATION
@ DIR_DURATION
Definition: concatdec.c:425
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
safe_filename
static int safe_filename(const char *f)
Definition: concatdec.c:91
av_realloc
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:152
avcodec_parameters_copy
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: codec_par.c:72
bprint.h
i
int i
Definition: input.c:406
av_bsf_receive_packet
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
Retrieve a filtered packet.
Definition: bsf.c:226
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
avio_internal.h
ConcatFile::start_time
int64_t start_time
Definition: concatdec.c:46
ConcatContext::cur_file
ConcatFile * cur_file
Definition: concatdec.c:63
MATCH_EXACT_ID
@ MATCH_EXACT_ID
Definition: concatdec.c:36
AV_ROUND_DOWN
@ AV_ROUND_DOWN
Round toward -infinity.
Definition: mathematics.h:82
delta
float delta
Definition: vorbis_enc_data.h:430
url.h
avpriv_new_chapter
AVChapter * avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:835
ConcatContext::eof
int eof
Definition: concatdec.c:68
ConcatContext
Definition: avf_concat.c:37
files
Writing a table generator This documentation is preliminary Parts of the API are not good and should be changed Basic concepts A table generator consists of two files
Definition: tablegen.txt:8
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:852
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:845
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
ConcatStream::bsf
AVBSFContext * bsf
Definition: concatdec.c:40
ConcatFile
Definition: concatdec.c:44
avformat.h
DIR_FILE
@ DIR_FILE
Definition: concatdec.c:424
av_bsf_send_packet
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
Submit a packet for filtering.
Definition: bsf.c:198
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
syntax
static const ParseSyntax syntax[]
Definition: concatdec.c:439
probe
static int probe(const AVProbeData *p)
Definition: act.c:37
ConcatFile::url
char * url
Definition: concatdec.c:45
AVBitStreamFilter
Definition: bsf.h:90
ConcatContext::seekable
int seekable
Definition: concatdec.c:67
DEC
#define DEC
Definition: concatdec.c:924
AVRational::den
int den
Denominator.
Definition: rational.h:60
av_dict_parse_string
int av_dict_parse_string(AVDictionary **pm, const char *str, const char *key_val_sep, const char *pairs_sep, int flags)
Parse the key/value pairs list and add the parsed entries to a dictionary.
Definition: dict.c:180
ConcatContext::files
ConcatFile * files
Definition: concatdec.c:62
AVStream::r_frame_rate
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:981
ParseSyntax::flags
uint8_t flags
Definition: concatdec.c:419
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:1146
rescale_interval
static void rescale_interval(AVRational tb_in, AVRational tb_out, int64_t *min_ts, int64_t *ts, int64_t *max_ts)
Definition: concatdec.c:818
AVFormatContext::duration
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1199
AVPacket::stream_index
int stream_index
Definition: packet.h:375
DIR_INPOINT
@ DIR_INPOINT
Definition: concatdec.c:426
ConcatFile::nb_streams
int nb_streams
Definition: concatdec.c:57
DIR_STREAM
@ DIR_STREAM
Definition: concatdec.c:431
ConcatFile::options
AVDictionary * options
Definition: concatdec.c:56
AVERROR_DECODER_NOT_FOUND
#define AVERROR_DECODER_NOT_FOUND
Decoder not found.
Definition: error.h:54
av_dict_set_int
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it.
Definition: dict.c:147
detect_stream_specific
static int detect_stream_specific(AVFormatContext *avf, int idx)
Definition: concatdec.c:197
map
const VDPAUPixFmtMap * map
Definition: hwcontext_vdpau.c:71
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
ff_make_absolute_url
int ff_make_absolute_url(char *buf, int size, const char *base, const char *rel)
Convert a relative url into an absolute url, given a base url.
Definition: url.c:319
AV_ROUND_PASS_MINMAX
@ AV_ROUND_PASS_MINMAX
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
Definition: mathematics.h:108
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:241
ParseDirective
ParseDirective
Definition: concatdec.c:422
ff_concat_demuxer
const AVInputFormat ff_concat_demuxer
Definition: concatdec.c:944
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
av_dict_copy
int av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags)
Copy entries from one AVDictionary struct into another.
Definition: dict.c:217
FFStream::cur_dts
int64_t cur_dts
Definition: internal.h:423
av_bsf_free
void av_bsf_free(AVBSFContext **pctx)
Free a bitstream filter context and everything associated with it; write NULL into the supplied point...
Definition: bsf.c:48
avio_find_protocol_name
const char * avio_find_protocol_name(const char *url)
Return the name of the protocol that will handle the passed URL.
Definition: avio.c:467
AVCodecDescriptor::id
enum AVCodecID id
Definition: codec_desc.h:39
timestamp.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
ConcatContext::safe
int safe
Definition: concatdec.c:66
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
av_ts2str
#define av_ts2str(ts)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:54
concat_seek
static int concat_seek(AVFormatContext *avf, int stream, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: concatdec.c:896
avstring.h
ConcatFile::metadata
AVDictionary * metadata
Definition: concatdec.c:55
DIR_CHAPTER
@ DIR_CHAPTER
Definition: concatdec.c:436
AV_RB24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:97
avcodec_descriptor_get_by_name
const AVCodecDescriptor * avcodec_descriptor_get_by_name(const char *name)
Definition: codec_desc.c:3529
match_streams
static int match_streams(AVFormatContext *avf)
Definition: concatdec.c:281
ConcatMatchMode
ConcatMatchMode
Definition: concatdec.c:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1125
ConcatFile::user_duration
int64_t user_duration
Definition: concatdec.c:50
av_rescale_q_rnd
int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, enum AVRounding rnd)
Rescale a 64-bit integer by 2 rational numbers with specified rounding.
Definition: mathematics.c:133
av_bsf_alloc
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
Allocate a context for a given bitstream filter.
Definition: bsf.c:100
concat_read_close
static int concat_read_close(AVFormatContext *avf)
Definition: concatdec.c:390
DIR_STCODEC
@ DIR_STCODEC
Definition: concatdec.c:434
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:451