Libav
gxf.c
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1 /*
2  * GXF demuxer.
3  * Copyright (c) 2006 Reimar Doeffinger
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
23 #include "libavutil/common.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "gxf.h"
27 #include "libavcodec/mpeg12data.h"
28 
30  int64_t first_field;
31  int64_t last_field;
34 };
35 
43 static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) {
44  if (avio_rb32(pb))
45  return 0;
46  if (avio_r8(pb) != 1)
47  return 0;
48  *type = avio_r8(pb);
49  *length = avio_rb32(pb);
50  if ((*length >> 24) || *length < 16)
51  return 0;
52  *length -= 16;
53  if (avio_rb32(pb))
54  return 0;
55  if (avio_r8(pb) != 0xe1)
56  return 0;
57  if (avio_r8(pb) != 0xe2)
58  return 0;
59  return 1;
60 }
61 
65 static int gxf_probe(AVProbeData *p) {
66  static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet
67  static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2};
68  if (!memcmp(p->buf, startcode, sizeof(startcode)) &&
69  !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode)))
70  return AVPROBE_SCORE_MAX;
71  return 0;
72 }
73 
80 static int get_sindex(AVFormatContext *s, int id, int format) {
81  int i;
82  AVStream *st = NULL;
83  i = ff_find_stream_index(s, id);
84  if (i >= 0)
85  return i;
86  st = avformat_new_stream(s, NULL);
87  if (!st)
88  return AVERROR(ENOMEM);
89  st->id = id;
90  switch (format) {
91  case 3:
92  case 4:
95  break;
96  case 13:
97  case 15:
100  break;
101  case 14:
102  case 16:
105  break;
106  case 11:
107  case 12:
108  case 20:
111  st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
112  break;
113  case 22:
114  case 23:
117  st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc.
118  break;
119  case 9:
122  st->codec->channels = 1;
124  st->codec->sample_rate = 48000;
125  st->codec->bit_rate = 3 * 1 * 48000 * 8;
126  st->codec->block_align = 3 * 1;
127  st->codec->bits_per_coded_sample = 24;
128  break;
129  case 10:
132  st->codec->channels = 1;
134  st->codec->sample_rate = 48000;
135  st->codec->bit_rate = 2 * 1 * 48000 * 8;
136  st->codec->block_align = 2 * 1;
137  st->codec->bits_per_coded_sample = 16;
138  break;
139  case 17:
142  st->codec->channels = 2;
144  st->codec->sample_rate = 48000;
145  break;
146  // timecode tracks:
147  case 7:
148  case 8:
149  case 24:
152  break;
153  default:
156  break;
157  }
158  return s->nb_streams - 1;
159 }
160 
166 static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
169  while (*len >= 2) {
170  GXFMatTag tag = avio_r8(pb);
171  int tlen = avio_r8(pb);
172  *len -= 2;
173  if (tlen > *len)
174  return;
175  *len -= tlen;
176  if (tlen == 4) {
177  uint32_t value = avio_rb32(pb);
178  if (tag == MAT_FIRST_FIELD)
179  si->first_field = value;
180  else if (tag == MAT_LAST_FIELD)
181  si->last_field = value;
182  } else
183  avio_skip(pb, tlen);
184  }
185 }
186 
187 static const AVRational frame_rate_tab[] = {
188  { 60, 1},
189  {60000, 1001},
190  { 50, 1},
191  { 30, 1},
192  {30000, 1001},
193  { 25, 1},
194  { 24, 1},
195  {24000, 1001},
196  { 0, 0},
197 };
198 
205  if (fps < 1 || fps > 9) fps = 9;
206  return frame_rate_tab[fps - 1];
207 }
208 
214 static AVRational fps_umf2avr(uint32_t flags) {
215  static const AVRational map[] = {{50, 1}, {60000, 1001}, {24, 1},
216  {25, 1}, {30000, 1001}};
217  int idx = av_log2((flags & 0x7c0) >> 6);
218  return map[idx];
219 }
220 
226 static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) {
227  si->frames_per_second = (AVRational){0, 0};
228  si->fields_per_frame = 0;
229  while (*len >= 2) {
230  GXFTrackTag tag = avio_r8(pb);
231  int tlen = avio_r8(pb);
232  *len -= 2;
233  if (tlen > *len)
234  return;
235  *len -= tlen;
236  if (tlen == 4) {
237  uint32_t value = avio_rb32(pb);
238  if (tag == TRACK_FPS)
239  si->frames_per_second = fps_tag2avr(value);
240  else if (tag == TRACK_FPF && (value == 1 || value == 2))
241  si->fields_per_frame = value;
242  } else
243  avio_skip(pb, tlen);
244  }
245 }
246 
250 static void gxf_read_index(AVFormatContext *s, int pkt_len) {
251  AVIOContext *pb = s->pb;
252  AVStream *st = s->streams[0];
253  uint32_t fields_per_map = avio_rl32(pb);
254  uint32_t map_cnt = avio_rl32(pb);
255  int i;
256  pkt_len -= 8;
257  if (s->flags & AVFMT_FLAG_IGNIDX) {
258  avio_skip(pb, pkt_len);
259  return;
260  }
261  if (map_cnt > 1000) {
262  av_log(s, AV_LOG_ERROR, "too many index entries %u (%x)\n", map_cnt, map_cnt);
263  map_cnt = 1000;
264  }
265  if (pkt_len < 4 * map_cnt) {
266  av_log(s, AV_LOG_ERROR, "invalid index length\n");
267  avio_skip(pb, pkt_len);
268  return;
269  }
270  pkt_len -= 4 * map_cnt;
271  av_add_index_entry(st, 0, 0, 0, 0, 0);
272  for (i = 0; i < map_cnt; i++)
273  av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024,
274  i * (uint64_t)fields_per_map + 1, 0, 0, 0);
275  avio_skip(pb, pkt_len);
276 }
277 
278 static int gxf_header(AVFormatContext *s) {
279  AVIOContext *pb = s->pb;
280  GXFPktType pkt_type;
281  int map_len;
282  int len;
283  AVRational main_timebase = {0, 0};
284  struct gxf_stream_info *si = s->priv_data;
285  int i;
286  if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) {
287  av_log(s, AV_LOG_ERROR, "map packet not found\n");
288  return 0;
289  }
290  map_len -= 2;
291  if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) {
292  av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n");
293  return 0;
294  }
295  map_len -= 2;
296  len = avio_rb16(pb); // length of material data section
297  if (len > map_len) {
298  av_log(s, AV_LOG_ERROR, "material data longer than map data\n");
299  return 0;
300  }
301  map_len -= len;
302  gxf_material_tags(pb, &len, si);
303  avio_skip(pb, len);
304  map_len -= 2;
305  len = avio_rb16(pb); // length of track description
306  if (len > map_len) {
307  av_log(s, AV_LOG_ERROR, "track description longer than map data\n");
308  return 0;
309  }
310  map_len -= len;
311  while (len > 0) {
312  int track_type, track_id, track_len;
313  AVStream *st;
314  int idx;
315  len -= 4;
316  track_type = avio_r8(pb);
317  track_id = avio_r8(pb);
318  track_len = avio_rb16(pb);
319  len -= track_len;
320  gxf_track_tags(pb, &track_len, si);
321  avio_skip(pb, track_len);
322  if (!(track_type & 0x80)) {
323  av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type);
324  continue;
325  }
326  track_type &= 0x7f;
327  if ((track_id & 0xc0) != 0xc0) {
328  av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id);
329  continue;
330  }
331  track_id &= 0x3f;
332  idx = get_sindex(s, track_id, track_type);
333  if (idx < 0) continue;
334  st = s->streams[idx];
335  if (!main_timebase.num || !main_timebase.den) {
336  main_timebase.num = si->frames_per_second.den;
337  main_timebase.den = si->frames_per_second.num * 2;
338  }
339  st->start_time = si->first_field;
341  st->duration = si->last_field - si->first_field;
342  }
343  if (len < 0)
344  av_log(s, AV_LOG_ERROR, "invalid track description length specified\n");
345  if (map_len)
346  avio_skip(pb, map_len);
347  if (!parse_packet_header(pb, &pkt_type, &len)) {
348  av_log(s, AV_LOG_ERROR, "sync lost in header\n");
349  return -1;
350  }
351  if (pkt_type == PKT_FLT) {
352  gxf_read_index(s, len);
353  if (!parse_packet_header(pb, &pkt_type, &len)) {
354  av_log(s, AV_LOG_ERROR, "sync lost in header\n");
355  return -1;
356  }
357  }
358  if (pkt_type == PKT_UMF) {
359  if (len >= 0x39) {
360  AVRational fps;
361  len -= 0x39;
362  avio_skip(pb, 5); // preamble
363  avio_skip(pb, 0x30); // payload description
364  fps = fps_umf2avr(avio_rl32(pb));
365  if (!main_timebase.num || !main_timebase.den) {
366  // this may not always be correct, but simply the best we can get
367  main_timebase.num = fps.den;
368  main_timebase.den = fps.num * 2;
369  }
370  } else
371  av_log(s, AV_LOG_INFO, "UMF packet too short\n");
372  } else
373  av_log(s, AV_LOG_INFO, "UMF packet missing\n");
374  avio_skip(pb, len);
375  // set a fallback value, 60000/1001 is specified for audio-only files
376  // so use that regardless of why we do not know the video frame rate.
377  if (!main_timebase.num || !main_timebase.den)
378  main_timebase = (AVRational){1001, 60000};
379  for (i = 0; i < s->nb_streams; i++) {
380  AVStream *st = s->streams[i];
381  avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den);
382  }
383  return 0;
384 }
385 
386 #define READ_ONE() \
387  { \
388  if (!max_interval-- || pb->eof_reached) \
389  goto out; \
390  tmp = tmp << 8 | avio_r8(pb); \
391  }
392 
400 static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) {
401  uint32_t tmp;
402  uint64_t last_pos;
403  uint64_t last_found_pos = 0;
404  int cur_track;
405  int64_t cur_timestamp = AV_NOPTS_VALUE;
406  int len;
407  AVIOContext *pb = s->pb;
408  GXFPktType type;
409  tmp = avio_rb32(pb);
410 start:
411  while (tmp)
412  READ_ONE();
413  READ_ONE();
414  if (tmp != 1)
415  goto start;
416  last_pos = avio_tell(pb);
417  if (avio_seek(pb, -5, SEEK_CUR) < 0)
418  goto out;
419  if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) {
420  if (avio_seek(pb, last_pos, SEEK_SET) < 0)
421  goto out;
422  goto start;
423  }
424  avio_r8(pb);
425  cur_track = avio_r8(pb);
426  cur_timestamp = avio_rb32(pb);
427  last_found_pos = avio_tell(pb) - 16 - 6;
428  if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) {
429  if (avio_seek(pb, last_pos, SEEK_SET) >= 0)
430  goto start;
431  }
432 out:
433  if (last_found_pos)
434  avio_seek(pb, last_found_pos, SEEK_SET);
435  return cur_timestamp;
436 }
437 
438 static int gxf_packet(AVFormatContext *s, AVPacket *pkt) {
439  AVIOContext *pb = s->pb;
440  GXFPktType pkt_type;
441  int pkt_len;
442  struct gxf_stream_info *si = s->priv_data;
443 
444  while (!pb->eof_reached) {
445  AVStream *st;
446  int track_type, track_id, ret;
447  int field_nr, field_info, skip = 0;
448  int stream_index;
449  if (!parse_packet_header(pb, &pkt_type, &pkt_len)) {
450  if (!pb->eof_reached)
451  av_log(s, AV_LOG_ERROR, "sync lost\n");
452  return -1;
453  }
454  if (pkt_type == PKT_FLT) {
455  gxf_read_index(s, pkt_len);
456  continue;
457  }
458  if (pkt_type != PKT_MEDIA) {
459  avio_skip(pb, pkt_len);
460  continue;
461  }
462  if (pkt_len < 16) {
463  av_log(s, AV_LOG_ERROR, "invalid media packet length\n");
464  continue;
465  }
466  pkt_len -= 16;
467  track_type = avio_r8(pb);
468  track_id = avio_r8(pb);
469  stream_index = get_sindex(s, track_id, track_type);
470  if (stream_index < 0)
471  return stream_index;
472  st = s->streams[stream_index];
473  field_nr = avio_rb32(pb);
474  field_info = avio_rb32(pb);
475  avio_rb32(pb); // "timeline" field number
476  avio_r8(pb); // flags
477  avio_r8(pb); // reserved
478  if (st->codec->codec_id == AV_CODEC_ID_PCM_S24LE ||
480  int first = field_info >> 16;
481  int last = field_info & 0xffff; // last is exclusive
482  int bps = av_get_bits_per_sample(st->codec->codec_id)>>3;
483  if (first <= last && last*bps <= pkt_len) {
484  avio_skip(pb, first*bps);
485  skip = pkt_len - last*bps;
486  pkt_len = (last-first)*bps;
487  } else
488  av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n");
489  }
490  ret = av_get_packet(pb, pkt, pkt_len);
491  if (skip)
492  avio_skip(pb, skip);
493  pkt->stream_index = stream_index;
494  pkt->dts = field_nr;
495 
496  //set duration manually for DV or else lavf misdetects the frame rate
497  if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO)
498  pkt->duration = si->fields_per_frame;
499 
500  return ret;
501  }
502  return AVERROR(EIO);
503 }
504 
505 static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
506  int res = 0;
507  uint64_t pos;
508  uint64_t maxlen = 100 * 1024 * 1024;
509  AVStream *st = s->streams[0];
510  int64_t start_time = s->streams[stream_index]->start_time;
511  int64_t found;
512  int idx;
513  if (timestamp < start_time) timestamp = start_time;
514  idx = av_index_search_timestamp(st, timestamp - start_time,
516  if (idx < 0)
517  return -1;
518  pos = st->index_entries[idx].pos;
519  if (idx < st->nb_index_entries - 2)
520  maxlen = st->index_entries[idx + 2].pos - pos;
521  maxlen = FFMAX(maxlen, 200 * 1024);
522  res = avio_seek(s->pb, pos, SEEK_SET);
523  if (res < 0)
524  return res;
525  found = gxf_resync_media(s, maxlen, -1, timestamp);
526  if (FFABS(found - timestamp) > 4)
527  return -1;
528  return 0;
529 }
530 
531 static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index,
532  int64_t *pos, int64_t pos_limit) {
533  AVIOContext *pb = s->pb;
534  int64_t res;
535  if (avio_seek(pb, *pos, SEEK_SET) < 0)
536  return AV_NOPTS_VALUE;
537  res = gxf_resync_media(s, pos_limit - *pos, -1, -1);
538  *pos = avio_tell(pb);
539  return res;
540 }
541 
543  .name = "gxf",
544  .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
545  .priv_data_size = sizeof(struct gxf_stream_info),
546  .read_probe = gxf_probe,
547  .read_header = gxf_header,
548  .read_packet = gxf_packet,
549  .read_seek = gxf_seek,
550  .read_timestamp = gxf_read_timestamp,
551 };
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:1518
GXFPktType
Definition: gxf.h:25
static int gxf_packet(AVFormatContext *s, AVPacket *pkt)
Definition: gxf.c:438
Bytestream IO Context.
Definition: avio.h:68
static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si)
filters out interesting tags from track information.
Definition: gxf.c:226
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:1312
enum AVCodecID id
Definition: mxfenc.c:84
static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si)
filters out interesting tags from material information.
Definition: gxf.c:166
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:3208
int64_t pos
Definition: avformat.h:644
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:1520
int num
numerator
Definition: rational.h:44
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:827
Definition: gxf.h:29
#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:250
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:574
static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: gxf.c:505
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1816
Format I/O context.
Definition: avformat.h:871
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:976
uint8_t
Opaque data information usually continuous.
Definition: avutil.h:189
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:589
enum AVStreamParseType need_parsing
Definition: avformat.h:816
int id
Format-specific stream ID.
Definition: avformat.h:690
Definition: gxf.h:49
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=av_sample_fmt_is_planar(in_fmt);out_planar=av_sample_fmt_is_planar(out_fmt);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_dlog(ac->avr,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:935
int64_t first_field
Definition: gxf.c:30
static int flags
Definition: log.c:44
uint32_t tag
Definition: movenc.c:822
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:118
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2481
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:995
static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length)
parses a packet header, extracting type and length
Definition: gxf.c:43
static AVRational fps_umf2avr(uint32_t flags)
convert UMF attributes flags to AVRational fps
Definition: gxf.c:214
#define READ_ONE()
Definition: gxf.c:386
static int64_t start_time
Definition: avplay.c:245
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1938
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1353
int64_t last_field
Definition: gxf.c:31
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:558
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
AVInputFormat ff_gxf_demuxer
Definition: gxf.c:542
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
AVStream * avformat_new_stream(AVFormatContext *s, AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2662
Definition: gxf.h:27
#define FFMAX(a, b)
Definition: common.h:55
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1840
Only parse headers, do not repack.
Definition: avformat.h:638
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:437
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:702
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:390
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:923
int ff_find_stream_index(AVFormatContext *s, int id)
Find stream index based on format-specific stream ID.
Definition: utils.c:3285
int bit_rate
the average bitrate
Definition: avcodec.h:1112
audio channel layout utility functions
static AVRational fps_tag2avr(int32_t fps)
convert fps tag value to AVRational fps
Definition: gxf.c:204
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
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:80
#define FFABS(a)
Definition: common.h:52
GXFTrackTag
Definition: gxf.h:42
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:186
int32_t fields_per_frame
Definition: gxf.c:33
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:110
Stream structure.
Definition: avformat.h:683
NULL
Definition: eval.c:55
#define AV_LOG_INFO
Standard information.
Definition: log.h:134
enum AVMediaType codec_type
Definition: avcodec.h:1062
enum AVCodecID codec_id
Definition: avcodec.h:1065
int sample_rate
samples per second
Definition: avcodec.h:1779
AVIOContext * pb
I/O context.
Definition: avformat.h:913
GXFMatTag
Definition: gxf.h:33
MPEG1/2 tables.
rational number numerator/denominator
Definition: rational.h:43
Definition: gxf.h:26
This structure contains the data a format has to probe a file.
Definition: avformat.h:388
static int gxf_header(AVFormatContext *s)
Definition: gxf.c:278
static const AVRational frame_rate_tab[]
Definition: gxf.c:187
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:734
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:395
Main libavformat public API header.
AVRational frames_per_second
Definition: gxf.c:32
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:400
int64_t start_time
Decoding: pts of the first frame of the stream, in stream time base.
Definition: avformat.h:727
int den
denominator
Definition: rational.h:45
unsigned bps
Definition: movenc.c:823
static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos, int64_t pos_limit)
Definition: gxf.c:531
static int gxf_probe(AVProbeData *p)
check if file starts with a PKT_MAP header
Definition: gxf.c:65
Definition: gxf.h:30
int eof_reached
true if eof reached
Definition: avio.h:96
int len
int channels
number of audio channels
Definition: avcodec.h:1780
#define av_log2
Definition: intmath.h:85
void * priv_data
Format private data.
Definition: avformat.h:899
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:972
Definition: gxf.h:47
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:516
int stream_index
Definition: avcodec.h:975
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
Definition: avcodec.h:950
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:228