FFmpeg  3.4.9
gxf.c
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1 /*
2  * GXF demuxer.
3  * Copyright (c) 2006 Reimar Doeffinger
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <inttypes.h>
23 
25 #include "libavutil/common.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "gxf.h"
29 #include "libavcodec/mpeg12data.h"
30 
32  int64_t first_field;
33  int64_t last_field;
36  int64_t track_aux_data;
37 };
38 
39 /**
40  * @brief parse gxf timecode and add it to metadata
41  */
42 static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame)
43 {
44  char tmp[128];
45  int field = timecode & 0xff;
46  int frame = fields_per_frame ? field / fields_per_frame : field;
47  int second = (timecode >> 8) & 0xff;
48  int minute = (timecode >> 16) & 0xff;
49  int hour = (timecode >> 24) & 0x1f;
50  int drop = (timecode >> 29) & 1;
51  // bit 30: color_frame, unused
52  // ignore invalid time code
53  if (timecode >> 31)
54  return 0;
55  snprintf(tmp, sizeof(tmp), "%02d:%02d:%02d%c%02d",
56  hour, minute, second, drop ? ';' : ':', frame);
57  return av_dict_set(pm, key, tmp, 0);
58 }
59 
60 /**
61  * @brief parses a packet header, extracting type and length
62  * @param pb AVIOContext to read header from
63  * @param type detected packet type is stored here
64  * @param length detected packet length, excluding header is stored here
65  * @return 0 if header not found or contains invalid data, 1 otherwise
66  */
67 static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) {
68  if (avio_rb32(pb))
69  return 0;
70  if (avio_r8(pb) != 1)
71  return 0;
72  *type = avio_r8(pb);
73  *length = avio_rb32(pb);
74  if ((*length >> 24) || *length < 16)
75  return 0;
76  *length -= 16;
77  if (avio_rb32(pb))
78  return 0;
79  if (avio_r8(pb) != 0xe1)
80  return 0;
81  if (avio_r8(pb) != 0xe2)
82  return 0;
83  return 1;
84 }
85 
86 /**
87  * @brief check if file starts with a PKT_MAP header
88  */
89 static int gxf_probe(AVProbeData *p) {
90  static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet
91  static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2};
92  if (!memcmp(p->buf, startcode, sizeof(startcode)) &&
93  !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode)))
94  return AVPROBE_SCORE_MAX;
95  return 0;
96 }
97 
98 /**
99  * @brief gets the stream index for the track with the specified id, creates new
100  * stream if not found
101  * @param id id of stream to find / add
102  * @param format stream format identifier
103  */
104 static int get_sindex(AVFormatContext *s, int id, int format) {
105  int i;
106  AVStream *st = NULL;
107  i = ff_find_stream_index(s, id);
108  if (i >= 0)
109  return i;
110  st = avformat_new_stream(s, NULL);
111  if (!st)
112  return AVERROR(ENOMEM);
113  st->id = id;
114  switch (format) {
115  case 3:
116  case 4:
119  break;
120  case 13:
121  case 14:
122  case 15:
123  case 16:
124  case 25:
127  break;
128  case 11:
129  case 12:
130  case 20:
133  st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
134  break;
135  case 22:
136  case 23:
139  st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
140  break;
141  case 9:
144  st->codecpar->channels = 1;
146  st->codecpar->sample_rate = 48000;
147  st->codecpar->bit_rate = 3 * 1 * 48000 * 8;
148  st->codecpar->block_align = 3 * 1;
150  break;
151  case 10:
154  st->codecpar->channels = 1;
156  st->codecpar->sample_rate = 48000;
157  st->codecpar->bit_rate = 2 * 1 * 48000 * 8;
158  st->codecpar->block_align = 2 * 1;
160  break;
161  case 17:
164  st->codecpar->channels = 2;
166  st->codecpar->sample_rate = 48000;
167  break;
168  case 26: /* AVCi50 / AVCi100 (AVC Intra) */
169  case 29: /* AVCHD */
173  break;
174  // timecode tracks:
175  case 7:
176  case 8:
177  case 24:
180  break;
181  case 30:
184  break;
185  default:
188  break;
189  }
190  return s->nb_streams - 1;
191 }
192 
193 /**
194  * @brief filters out interesting tags from material information.
195  * @param len length of tag section, will be adjusted to contain remaining bytes
196  * @param si struct to store collected information into
197  */
198 static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
201  while (*len >= 2) {
202  GXFMatTag tag = avio_r8(pb);
203  int tlen = avio_r8(pb);
204  *len -= 2;
205  if (tlen > *len)
206  return;
207  *len -= tlen;
208  if (tlen == 4) {
209  uint32_t value = avio_rb32(pb);
210  if (tag == MAT_FIRST_FIELD)
211  si->first_field = value;
212  else if (tag == MAT_LAST_FIELD)
213  si->last_field = value;
214  } else
215  avio_skip(pb, tlen);
216  }
217 }
218 
219 static const AVRational frame_rate_tab[] = {
220  { 60, 1},
221  {60000, 1001},
222  { 50, 1},
223  { 30, 1},
224  {30000, 1001},
225  { 25, 1},
226  { 24, 1},
227  {24000, 1001},
228  { 0, 0},
229 };
230 
231 /**
232  * @brief convert fps tag value to AVRational fps
233  * @param fps fps value from tag
234  * @return fps as AVRational, or 0 / 0 if unknown
235  */
237  if (fps < 1 || fps > 9) fps = 9;
238  return frame_rate_tab[fps - 1];
239 }
240 
241 /**
242  * @brief convert UMF attributes flags to AVRational fps
243  * @param flags UMF flags to convert
244  * @return fps as AVRational, or 0 / 0 if unknown
245  */
246 static AVRational fps_umf2avr(uint32_t flags) {
247  static const AVRational map[] = {{50, 1}, {60000, 1001}, {24, 1},
248  {25, 1}, {30000, 1001}};
249  int idx = av_log2((flags & 0x7c0) >> 6);
250  return map[idx];
251 }
252 
253 /**
254  * @brief filters out interesting tags from track information.
255  * @param len length of tag section, will be adjusted to contain remaining bytes
256  * @param si struct to store collected information into
257  */
258 static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
259  si->frames_per_second = (AVRational){0, 0};
260  si->fields_per_frame = 0;
261  si->track_aux_data = 0x80000000;
262  while (*len >= 2) {
263  GXFTrackTag tag = avio_r8(pb);
264  int tlen = avio_r8(pb);
265  *len -= 2;
266  if (tlen > *len)
267  return;
268  *len -= tlen;
269  if (tlen == 4) {
270  uint32_t value = avio_rb32(pb);
271  if (tag == TRACK_FPS)
272  si->frames_per_second = fps_tag2avr(value);
273  else if (tag == TRACK_FPF && (value == 1 || value == 2))
274  si->fields_per_frame = value;
275  } else if (tlen == 8 && tag == TRACK_AUX)
276  si->track_aux_data = avio_rl64(pb);
277  else
278  avio_skip(pb, tlen);
279  }
280 }
281 
282 /**
283  * @brief read index from FLT packet into stream 0 av_index
284  */
285 static void gxf_read_index(AVFormatContext *s, int pkt_len) {
286  AVIOContext *pb = s->pb;
287  AVStream *st;
288  uint32_t fields_per_map, map_cnt;
289  int i;
290  if (pkt_len < 8)
291  return;
292  fields_per_map = avio_rl32(pb);
293  map_cnt = avio_rl32(pb);
294  pkt_len -= 8;
295  if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) {
296  avio_skip(pb, pkt_len);
297  return;
298  }
299  st = s->streams[0];
300  if (map_cnt > 1000) {
301  av_log(s, AV_LOG_ERROR,
302  "too many index entries %"PRIu32" (%"PRIx32")\n",
303  map_cnt, map_cnt);
304  map_cnt = 1000;
305  }
306  if (pkt_len < 4 * map_cnt) {
307  av_log(s, AV_LOG_ERROR, "invalid index length\n");
308  avio_skip(pb, pkt_len);
309  return;
310  }
311  pkt_len -= 4 * map_cnt;
312  av_add_index_entry(st, 0, 0, 0, 0, 0);
313  for (i = 0; i < map_cnt; i++)
314  av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024,
315  i * (uint64_t)fields_per_map + 1, 0, 0, 0);
316  avio_skip(pb, pkt_len);
317 }
318 
320  AVIOContext *pb = s->pb;
321  GXFPktType pkt_type;
322  int map_len;
323  int len;
324  AVRational main_timebase = {0, 0};
325  struct gxf_stream_info *si = s->priv_data;
326  int i;
327  if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) {
328  av_log(s, AV_LOG_ERROR, "map packet not found\n");
329  return 0;
330  }
331  map_len -= 2;
332  if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) {
333  av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n");
334  return 0;
335  }
336  map_len -= 2;
337  len = avio_rb16(pb); // length of material data section
338  if (len > map_len) {
339  av_log(s, AV_LOG_ERROR, "material data longer than map data\n");
340  return 0;
341  }
342  map_len -= len;
343  gxf_material_tags(pb, &len, si);
344  avio_skip(pb, len);
345  map_len -= 2;
346  len = avio_rb16(pb); // length of track description
347  if (len > map_len) {
348  av_log(s, AV_LOG_ERROR, "track description longer than map data\n");
349  return 0;
350  }
351  map_len -= len;
352  while (len > 0) {
353  int track_type, track_id, track_len;
354  AVStream *st;
355  int idx;
356  len -= 4;
357  track_type = avio_r8(pb);
358  track_id = avio_r8(pb);
359  track_len = avio_rb16(pb);
360  len -= track_len;
361  if (!(track_type & 0x80)) {
362  av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type);
363  continue;
364  }
365  track_type &= 0x7f;
366  if ((track_id & 0xc0) != 0xc0) {
367  av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id);
368  continue;
369  }
370  track_id &= 0x3f;
371  gxf_track_tags(pb, &track_len, si);
372  // check for timecode tracks
373  if (track_type == 7 || track_type == 8 || track_type == 24) {
374  add_timecode_metadata(&s->metadata, "timecode",
375  si->track_aux_data & 0xffffffff,
376  si->fields_per_frame);
377 
378  }
379  avio_skip(pb, track_len);
380 
381  idx = get_sindex(s, track_id, track_type);
382  if (idx < 0) continue;
383  st = s->streams[idx];
384  if (!main_timebase.num || !main_timebase.den) {
385  main_timebase.num = si->frames_per_second.den;
386  main_timebase.den = si->frames_per_second.num * 2;
387  }
388  st->start_time = si->first_field;
390  st->duration = si->last_field - si->first_field;
391  }
392  if (len < 0)
393  av_log(s, AV_LOG_ERROR, "invalid track description length specified\n");
394  if (map_len)
395  avio_skip(pb, map_len);
396  if (!parse_packet_header(pb, &pkt_type, &len)) {
397  av_log(s, AV_LOG_ERROR, "sync lost in header\n");
398  return -1;
399  }
400  if (pkt_type == PKT_FLT) {
401  gxf_read_index(s, len);
402  if (!parse_packet_header(pb, &pkt_type, &len)) {
403  av_log(s, AV_LOG_ERROR, "sync lost in header\n");
404  return -1;
405  }
406  }
407  if (pkt_type == PKT_UMF) {
408  if (len >= 0x39) {
409  AVRational fps;
410  len -= 0x39;
411  avio_skip(pb, 5); // preamble
412  avio_skip(pb, 0x30); // payload description
413  fps = fps_umf2avr(avio_rl32(pb));
414  if (!main_timebase.num || !main_timebase.den) {
415  av_log(s, AV_LOG_WARNING, "No FPS track tag, using UMF fps tag."
416  " This might give wrong results.\n");
417  // this may not always be correct, but simply the best we can get
418  main_timebase.num = fps.den;
419  main_timebase.den = fps.num * 2;
420  }
421 
422  if (len >= 0x18) {
423  len -= 0x18;
424  avio_skip(pb, 0x10);
425  add_timecode_metadata(&s->metadata, "timecode_at_mark_in",
426  avio_rl32(pb), si->fields_per_frame);
427  add_timecode_metadata(&s->metadata, "timecode_at_mark_out",
428  avio_rl32(pb), si->fields_per_frame);
429  }
430  } else
431  av_log(s, AV_LOG_INFO, "UMF packet too short\n");
432  } else
433  av_log(s, AV_LOG_INFO, "UMF packet missing\n");
434  avio_skip(pb, len);
435  // set a fallback value, 60000/1001 is specified for audio-only files
436  // so use that regardless of why we do not know the video frame rate.
437  if (!main_timebase.num || !main_timebase.den)
438  main_timebase = (AVRational){1001, 60000};
439  for (i = 0; i < s->nb_streams; i++) {
440  AVStream *st = s->streams[i];
441  avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den);
442  }
443  return 0;
444 }
445 
446 #define READ_ONE() \
447  { \
448  if (!max_interval-- || avio_feof(pb)) \
449  goto out; \
450  tmp = tmp << 8 | avio_r8(pb); \
451  }
452 
453 /**
454  * @brief resync the stream on the next media packet with specified properties
455  * @param max_interval how many bytes to search for matching packet at most
456  * @param track track id the media packet must belong to, -1 for any
457  * @param timestamp minimum timestamp (== field number) the packet must have, -1 for any
458  * @return timestamp of packet found
459  */
460 static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) {
461  uint32_t tmp;
462  uint64_t last_pos;
463  uint64_t last_found_pos = 0;
464  int cur_track;
465  int64_t cur_timestamp = AV_NOPTS_VALUE;
466  int len;
467  AVIOContext *pb = s->pb;
468  GXFPktType type;
469  tmp = avio_rb32(pb);
470 start:
471  while (tmp)
472  READ_ONE();
473  READ_ONE();
474  if (tmp != 1)
475  goto start;
476  last_pos = avio_tell(pb);
477  if (avio_seek(pb, -5, SEEK_CUR) < 0)
478  goto out;
479  if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) {
480  if (avio_seek(pb, last_pos, SEEK_SET) < 0)
481  goto out;
482  goto start;
483  }
484  avio_r8(pb);
485  cur_track = avio_r8(pb);
486  cur_timestamp = avio_rb32(pb);
487  last_found_pos = avio_tell(pb) - 16 - 6;
488  if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) {
489  if (avio_seek(pb, last_pos, SEEK_SET) >= 0)
490  goto start;
491  }
492 out:
493  if (last_found_pos)
494  avio_seek(pb, last_found_pos, SEEK_SET);
495  return cur_timestamp;
496 }
497 
499  AVIOContext *pb = s->pb;
500  GXFPktType pkt_type;
501  int pkt_len;
502  struct gxf_stream_info *si = s->priv_data;
503 
504  while (!pb->eof_reached) {
505  AVStream *st;
506  int track_type, track_id, ret;
507  int field_nr, field_info, skip = 0;
508  int stream_index;
509  if (!parse_packet_header(pb, &pkt_type, &pkt_len)) {
510  if (!avio_feof(pb))
511  av_log(s, AV_LOG_ERROR, "sync lost\n");
512  return -1;
513  }
514  if (pkt_type == PKT_FLT) {
515  gxf_read_index(s, pkt_len);
516  continue;
517  }
518  if (pkt_type != PKT_MEDIA) {
519  avio_skip(pb, pkt_len);
520  continue;
521  }
522  if (pkt_len < 16) {
523  av_log(s, AV_LOG_ERROR, "invalid media packet length\n");
524  continue;
525  }
526  pkt_len -= 16;
527  track_type = avio_r8(pb);
528  track_id = avio_r8(pb);
529  stream_index = get_sindex(s, track_id, track_type);
530  if (stream_index < 0)
531  return stream_index;
532  st = s->streams[stream_index];
533  field_nr = avio_rb32(pb);
534  field_info = avio_rb32(pb);
535  avio_rb32(pb); // "timeline" field number
536  avio_r8(pb); // flags
537  avio_r8(pb); // reserved
540  int first = field_info >> 16;
541  int last = field_info & 0xffff; // last is exclusive
543  if (first <= last && last*bps <= pkt_len) {
544  avio_skip(pb, first*bps);
545  skip = pkt_len - last*bps;
546  pkt_len = (last-first)*bps;
547  } else
548  av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n");
549  }
550  ret = av_get_packet(pb, pkt, pkt_len);
551  if (skip)
552  avio_skip(pb, skip);
553  pkt->stream_index = stream_index;
554  pkt->dts = field_nr;
555 
556  //set duration manually for DV or else lavf misdetects the frame rate
558  pkt->duration = si->fields_per_frame;
559 
560  return ret;
561  }
562  return AVERROR_EOF;
563 }
564 
565 static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
566  int64_t res = 0;
567  uint64_t pos;
568  uint64_t maxlen = 100 * 1024 * 1024;
569  AVStream *st = s->streams[0];
570  int64_t start_time = s->streams[stream_index]->start_time;
571  int64_t found;
572  int idx;
573  if (timestamp < start_time) timestamp = start_time;
574  idx = av_index_search_timestamp(st, timestamp - start_time,
576  if (idx < 0)
577  return -1;
578  pos = st->index_entries[idx].pos;
579  if (idx < st->nb_index_entries - 2)
580  maxlen = st->index_entries[idx + 2].pos - pos;
581  maxlen = FFMAX(maxlen, 200 * 1024);
582  res = avio_seek(s->pb, pos, SEEK_SET);
583  if (res < 0)
584  return res;
585  found = gxf_resync_media(s, maxlen, -1, timestamp);
586  if (FFABS(found - timestamp) > 4)
587  return -1;
588  return 0;
589 }
590 
591 static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index,
592  int64_t *pos, int64_t pos_limit) {
593  AVIOContext *pb = s->pb;
594  int64_t res;
595  if (avio_seek(pb, *pos, SEEK_SET) < 0)
596  return AV_NOPTS_VALUE;
597  res = gxf_resync_media(s, pos_limit - *pos, -1, -1);
598  *pos = avio_tell(pb);
599  return res;
600 }
601 
603  .name = "gxf",
604  .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
605  .priv_data_size = sizeof(struct gxf_stream_info),
606  .read_probe = gxf_probe,
607  .read_header = gxf_header,
608  .read_packet = gxf_packet,
609  .read_seek = gxf_seek,
610  .read_timestamp = gxf_read_timestamp,
611 };
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2423
#define NULL
Definition: coverity.c:32
GXFPktType
Definition: gxf.h:25
static int gxf_packet(AVFormatContext *s, AVPacket *pkt)
Definition: gxf.c:498
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:161
static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si)
filters out interesting tags from track information.
Definition: gxf.c:258
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1994
static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si)
filters out interesting tags from material information.
Definition: gxf.c:198
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
void avpriv_set_pts_info(AVStream *s, 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:4756
int64_t pos
Definition: avformat.h:820
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2425
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4152
int num
Numerator.
Definition: rational.h:59
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:244
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1092
Definition: gxf.h:29
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
static void gxf_read_index(AVFormatContext *s, int pkt_len)
read index from FLT packet into stream 0 av_index
Definition: gxf.c:285
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:774
static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: gxf.c:565
Format I/O context.
Definition: avformat.h:1349
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1462
static int64_t start_time
Definition: ffplay.c:327
uint8_t
Opaque data information usually continuous.
Definition: avutil.h:203
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:789
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1697
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
int id
Format-specific stream ID.
Definition: avformat.h:896
Definition: gxf.h:49
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4383
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
static AVFrame * frame
int64_t first_field
Definition: gxf.c:32
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1460
static int flags
Definition: log.c:57
uint32_t tag
Definition: movenc.c:1414
#define AVERROR_EOF
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:292
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:556
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4254
#define av_log(a,...)
static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length)
parses a packet header, extracting type and length
Definition: gxf.c:67
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:4181
static AVRational fps_umf2avr(uint32_t flags)
convert UMF attributes flags to AVRational fps
Definition: gxf.c:246
#define READ_ONE()
Definition: gxf.c:446
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1709
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1567
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2105
int64_t last_field
Definition: gxf.c:33
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:758
#define AVERROR(e)
Definition: error.h:43
Definition: gxf.h:44
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:181
AVInputFormat ff_gxf_demuxer
Definition: gxf.c:602
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4148
Definition: gxf.h:27
int64_t track_aux_data
Definition: gxf.c:36
#define FFMAX(a, b)
Definition: common.h:94
Only parse headers, do not repack.
Definition: avformat.h:811
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:627
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1405
int block_align
Audio only.
Definition: avcodec.h:4269
int ff_find_stream_index(AVFormatContext *s, int id)
Find stream index based on format-specific stream ID.
Definition: utils.c:4840
audio channel layout utility functions
static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame)
parse gxf timecode and add it to metadata
Definition: gxf.c:42
static AVRational fps_tag2avr(int32_t fps)
convert fps tag value to AVRational fps
Definition: gxf.c:236
int32_t
static int get_sindex(AVFormatContext *s, int id, int format)
gets the stream index for the track with the specified id, creates new stream if not found ...
Definition: gxf.c:104
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
GXFTrackTag
Definition: gxf.h:42
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
int32_t fields_per_frame
Definition: gxf.c:35
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:219
#define av_log2
Definition: intmath.h:83
Stream structure.
Definition: avformat.h:889
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
AVIOContext * pb
I/O context.
Definition: avformat.h:1391
GXFMatTag
Definition: gxf.h:33
MPEG-1/2 tables.
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
double value
Definition: eval.c:91
static const char * format
Definition: movenc.c:47
Rational number (pair of numerator and denominator).
Definition: rational.h:58
Definition: gxf.h:26
const VDPAUPixFmtMap * map
#define snprintf
Definition: snprintf.h:34
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
static int gxf_header(AVFormatContext *s)
Definition: gxf.c:319
static const AVRational frame_rate_tab[]
Definition: gxf.c:219
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:946
int sample_rate
Audio only.
Definition: avcodec.h:4262
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
Main libavformat public API header.
AVRational frames_per_second
Definition: gxf.c:34
common internal and external API header
static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp)
resync the stream on the next media packet with specified properties
Definition: gxf.c:460
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:936
int den
Denominator.
Definition: rational.h:60
unsigned bps
Definition: movenc.c:1415
static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos, int64_t pos_limit)
Definition: gxf.c:591
static int gxf_probe(AVProbeData *p)
check if file starts with a PKT_MAP header
Definition: gxf.c:89
Definition: gxf.h:30
int eof_reached
true if eof reached
Definition: avio.h:240
int len
void * priv_data
Format private data.
Definition: avformat.h:1377
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4194
int channels
Audio only.
Definition: avcodec.h:4258
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1678
Definition: gxf.h:47
FILE * out
Definition: movenc.c:54
void INT64 start
Definition: avisynth_c.h:690
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
AVCodecParameters * codecpar
Definition: avformat.h:1252
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:356
const char int length
Definition: avisynth_c.h:768
int stream_index
Definition: avcodec.h:1681
#define AV_CH_LAYOUT_MONO
enum AVCodecID id
This structure stores compressed data.
Definition: avcodec.h:1656
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:766
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
static uint8_t tmp[11]
Definition: aes_ctr.c:26