FFmpeg
mlvdec.c
Go to the documentation of this file.
1 /*
2  * Magic Lantern Video (MLV) demuxer
3  * Copyright (c) 2014 Peter Ross
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 /**
23  * @file
24  * Magic Lantern Video (MLV) demuxer
25  */
26 
27 #include "libavutil/imgutils.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/rational.h"
30 #include "avformat.h"
31 #include "demux.h"
32 #include "internal.h"
33 #include "riff.h"
34 
35 #define MLV_VERSION "v2.0"
36 
37 #define MLV_VIDEO_CLASS_RAW 1
38 #define MLV_VIDEO_CLASS_YUV 2
39 #define MLV_VIDEO_CLASS_JPEG 3
40 #define MLV_VIDEO_CLASS_H264 4
41 
42 #define MLV_AUDIO_CLASS_WAV 1
43 
44 #define MLV_CLASS_FLAG_DELTA 0x40
45 #define MLV_CLASS_FLAG_LZMA 0x80
46 
47 typedef struct {
48  AVIOContext *pb[101];
49  int class[2];
50  int stream_index;
51  uint64_t pts;
52 } MlvContext;
53 
54 static int probe(const AVProbeData *p)
55 {
56  if (AV_RL32(p->buf) == MKTAG('M','L','V','I') &&
57  AV_RL32(p->buf + 4) >= 52 &&
58  !memcmp(p->buf + 8, MLV_VERSION, 5))
59  return AVPROBE_SCORE_MAX;
60  return 0;
61 }
62 
63 static int check_file_header(AVIOContext *pb, uint64_t guid)
64 {
65  unsigned int size;
66  uint8_t version[8];
67 
68  avio_skip(pb, 4);
69  size = avio_rl32(pb);
70  if (size < 52)
71  return AVERROR_INVALIDDATA;
72  avio_read(pb, version, 8);
73  if (memcmp(version, MLV_VERSION, 5) || avio_rl64(pb) != guid)
74  return AVERROR_INVALIDDATA;
75  avio_skip(pb, size - 24);
76  return 0;
77 }
78 
79 static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
80 {
81  char * value = av_malloc(size + 1);
82  if (!value) {
83  avio_skip(pb, size);
84  return;
85  }
86 
87  avio_read(pb, value, size);
88  if (!value[0]) {
89  av_free(value);
90  return;
91  }
92 
93  value[size] = 0;
94  av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
95 }
96 
97 static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
98 {
99  av_dict_set_int(&avctx->metadata, tag, avio_r8(pb), 0);
100 }
101 
102 static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
103 {
104  av_dict_set_int(&avctx->metadata, tag, avio_rl16(pb), 0);
105 }
106 
107 static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
108 {
109  av_dict_set_int(&avctx->metadata, tag, avio_rl32(pb), 0);
110 }
111 
112 static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
113 {
114  av_dict_set_int(&avctx->metadata, tag, avio_rl64(pb), 0);
115 }
116 
117 static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
118 {
119  FFStream *const vsti = ffstream(vst), *const asti = ffstream(ast);
120  MlvContext *mlv = avctx->priv_data;
121  AVIOContext *pb = mlv->pb[file];
122  int ret;
123  while (!avio_feof(pb)) {
124  int type;
125  unsigned int size;
126  type = avio_rl32(pb);
127  size = avio_rl32(pb);
128  avio_skip(pb, 8); //timestamp
129  if (size < 16)
130  break;
131  size -= 16;
132  if (vst && type == MKTAG('R','A','W','I') && size >= 164) {
133  unsigned width = avio_rl16(pb);
134  unsigned height = avio_rl16(pb);
135  unsigned bits_per_coded_sample;
136  ret = av_image_check_size(width, height, 0, avctx);
137  if (ret < 0)
138  return ret;
139  if (avio_rl32(pb) != 1)
140  avpriv_request_sample(avctx, "raw api version");
141  avio_skip(pb, 20); // pointer, width, height, pitch, frame_size
142  bits_per_coded_sample = avio_rl32(pb);
143  if (bits_per_coded_sample > (INT_MAX - 7) / (width * height)) {
144  av_log(avctx, AV_LOG_ERROR,
145  "invalid bits_per_coded_sample %u (size: %ux%u)\n",
146  bits_per_coded_sample, width, height);
147  return AVERROR_INVALIDDATA;
148  }
149  vst->codecpar->width = width;
150  vst->codecpar->height = height;
151  vst->codecpar->bits_per_coded_sample = bits_per_coded_sample;
152  avio_skip(pb, 8 + 16 + 24); // black_level, white_level, xywh, active_area, exposure_bias
153  if (avio_rl32(pb) != 0x2010100) /* RGGB */
154  avpriv_request_sample(avctx, "cfa_pattern");
155  avio_skip(pb, 80); // calibration_illuminant1, color_matrix1, dynamic_range
156  vst->codecpar->format = AV_PIX_FMT_BAYER_RGGB16LE;
157  vst->codecpar->codec_tag = MKTAG('B', 'I', 'T', 16);
158  size -= 164;
159  } else if (ast && type == MKTAG('W', 'A', 'V', 'I') && size >= 16) {
160  ret = ff_get_wav_header(avctx, pb, ast->codecpar, 16, 0);
161  if (ret < 0)
162  return ret;
163  size -= 16;
164  } else if (type == MKTAG('I','N','F','O')) {
165  if (size > 0)
166  read_string(avctx, pb, "info", size);
167  continue;
168  } else if (type == MKTAG('I','D','N','T') && size >= 36) {
169  read_string(avctx, pb, "cameraName", 32);
170  read_uint32(avctx, pb, "cameraModel", "0x%"PRIx32);
171  size -= 36;
172  if (size >= 32) {
173  read_string(avctx, pb, "cameraSerial", 32);
174  size -= 32;
175  }
176  } else if (type == MKTAG('L','E','N','S') && size >= 48) {
177  read_uint16(avctx, pb, "focalLength", "%i");
178  read_uint16(avctx, pb, "focalDist", "%i");
179  read_uint16(avctx, pb, "aperture", "%i");
180  read_uint8(avctx, pb, "stabilizerMode", "%i");
181  read_uint8(avctx, pb, "autofocusMode", "%i");
182  read_uint32(avctx, pb, "flags", "0x%"PRIx32);
183  read_uint32(avctx, pb, "lensID", "%"PRIi32);
184  read_string(avctx, pb, "lensName", 32);
185  size -= 48;
186  if (size >= 32) {
187  read_string(avctx, pb, "lensSerial", 32);
188  size -= 32;
189  }
190  } else if (vst && type == MKTAG('V', 'I', 'D', 'F') && size >= 4) {
191  uint64_t pts = avio_rl32(pb);
192  ff_add_index_entry(&vsti->index_entries, &vsti->nb_index_entries,
193  &vsti->index_entries_allocated_size,
194  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
195  size -= 4;
196  } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
197  uint64_t pts = avio_rl32(pb);
198  ff_add_index_entry(&asti->index_entries, &asti->nb_index_entries,
199  &asti->index_entries_allocated_size,
200  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
201  size -= 4;
202  } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
203  read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
204  read_uint32(avctx, pb, "kelvin", "%"PRIi32);
205  read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
206  read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
207  read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
208  read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
209  read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
210  size -= 28;
211  } else if (type == MKTAG('R','T','C','I') && size >= 20) {
212  char str[32];
213  struct tm time = { 0 };
214  time.tm_sec = avio_rl16(pb);
215  time.tm_min = avio_rl16(pb);
216  time.tm_hour = avio_rl16(pb);
217  time.tm_mday = avio_rl16(pb);
218  time.tm_mon = avio_rl16(pb);
219  time.tm_year = avio_rl16(pb);
220  time.tm_wday = avio_rl16(pb);
221  time.tm_yday = avio_rl16(pb);
222  time.tm_isdst = avio_rl16(pb);
223  avio_skip(pb, 2);
224  if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
225  av_dict_set(&avctx->metadata, "time", str, 0);
226  size -= 20;
227  } else if (type == MKTAG('E','X','P','O') && size >= 16) {
228  av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
229  read_uint32(avctx, pb, "isoValue", "%"PRIi32);
230  read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
231  read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
232  size -= 16;
233  if (size >= 8) {
234  read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
235  size -= 8;
236  }
237  } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
238  read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
239  read_uint32(avctx, pb, "contrast", "%"PRIi32);
240  read_uint32(avctx, pb, "sharpness", "%"PRIi32);
241  read_uint32(avctx, pb, "saturation", "%"PRIi32);
242  read_uint32(avctx, pb, "colortone", "%"PRIi32);
243  read_string(avctx, pb, "picStyleName", 16);
244  size -= 36;
245  } else if (type == MKTAG('M','A','R','K')) {
246  } else if (type == MKTAG('N','U','L','L')) {
247  } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
248  } else {
249  av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
250  av_fourcc2str(type), size);
251  }
252  avio_skip(pb, size);
253  }
254  return 0;
255 }
256 
257 static int read_header(AVFormatContext *avctx)
258 {
259  MlvContext *mlv = avctx->priv_data;
260  AVIOContext *pb = avctx->pb;
261  AVStream *vst = NULL, *ast = NULL;
262  FFStream *vsti = NULL, *asti = NULL;
263  int size, ret;
264  unsigned nb_video_frames, nb_audio_frames;
265  uint64_t guid;
266  char guidstr[32];
267 
268  avio_skip(pb, 4);
269  size = avio_rl32(pb);
270  if (size < 52)
271  return AVERROR_INVALIDDATA;
272 
273  avio_skip(pb, 8);
274 
275  guid = avio_rl64(pb);
276  snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
277  av_dict_set(&avctx->metadata, "guid", guidstr, 0);
278 
279  avio_skip(pb, 8); //fileNum, fileCount, fileFlags
280 
281  mlv->class[0] = avio_rl16(pb);
282  mlv->class[1] = avio_rl16(pb);
283 
284  nb_video_frames = avio_rl32(pb);
285  nb_audio_frames = avio_rl32(pb);
286 
287  if (nb_video_frames && mlv->class[0]) {
288  vst = avformat_new_stream(avctx, NULL);
289  if (!vst)
290  return AVERROR(ENOMEM);
291  vsti = ffstream(vst);
292 
293  vst->id = 0;
294  vst->nb_frames = nb_video_frames;
295  if ((mlv->class[0] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)))
296  avpriv_request_sample(avctx, "compression");
297  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
298  switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
299  case MLV_VIDEO_CLASS_RAW:
300  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
301  break;
302  case MLV_VIDEO_CLASS_YUV:
303  vst->codecpar->format = AV_PIX_FMT_YUV420P;
304  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
305  vst->codecpar->codec_tag = 0;
306  break;
307  case MLV_VIDEO_CLASS_JPEG:
308  vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
309  vst->codecpar->codec_tag = 0;
310  break;
311  case MLV_VIDEO_CLASS_H264:
312  vst->codecpar->codec_id = AV_CODEC_ID_H264;
313  vst->codecpar->codec_tag = 0;
314  break;
315  default:
316  avpriv_request_sample(avctx, "unknown video class");
317  }
318  }
319 
320  if (nb_audio_frames && mlv->class[1]) {
321  ast = avformat_new_stream(avctx, NULL);
322  if (!ast)
323  return AVERROR(ENOMEM);
324  asti = ffstream(ast);
325  ast->id = 1;
326  ast->nb_frames = nb_audio_frames;
327  if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
328  avpriv_request_sample(avctx, "compression");
329  if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
330  avpriv_request_sample(avctx, "unknown audio class");
331 
332  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
333  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
334  }
335 
336  if (vst) {
337  AVRational framerate;
338  framerate.num = avio_rl32(pb);
339  framerate.den = avio_rl32(pb);
340  avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
341  } else
342  avio_skip(pb, 8);
343 
344  avio_skip(pb, size - 52);
345 
346  /* scan primary file */
347  mlv->pb[100] = avctx->pb;
348  ret = scan_file(avctx, vst, ast, 100);
349  if (ret < 0)
350  return ret;
351 
352  /* scan secondary files */
353  if (strlen(avctx->url) > 2) {
354  int i;
355  char *filename = av_strdup(avctx->url);
356 
357  if (!filename)
358  return AVERROR(ENOMEM);
359 
360  for (i = 0; i < 100; i++) {
361  snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
362  if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
363  break;
364  if (check_file_header(mlv->pb[i], guid) < 0) {
365  av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
366  ff_format_io_close(avctx, &mlv->pb[i]);
367  continue;
368  }
369  av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
370  ret = scan_file(avctx, vst, ast, i);
371  if (ret < 0) {
372  av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
373  ff_format_io_close(avctx, &mlv->pb[i]);
374  continue;
375  }
376  }
377  av_free(filename);
378  }
379 
380  if (vst)
381  vst->duration = vsti->nb_index_entries;
382  if (ast)
383  ast->duration = asti->nb_index_entries;
384 
385  if ((vst && !vsti->nb_index_entries) || (ast && !asti->nb_index_entries)) {
386  av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
387  return AVERROR_INVALIDDATA;
388  }
389 
390  if (vst && ast)
391  avio_seek(pb, FFMIN(vsti->index_entries[0].pos, asti->index_entries[0].pos), SEEK_SET);
392  else if (vst)
393  avio_seek(pb, vsti->index_entries[0].pos, SEEK_SET);
394  else if (ast)
395  avio_seek(pb, asti->index_entries[0].pos, SEEK_SET);
396 
397  return 0;
398 }
399 
400 static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
401 {
402  MlvContext *mlv = avctx->priv_data;
403  AVIOContext *pb;
404  AVStream *st;
405  FFStream *sti;
406  int index, ret;
407  unsigned int size, space;
408 
409  if (!avctx->nb_streams)
410  return AVERROR_EOF;
411 
412  st = avctx->streams[mlv->stream_index];
413  sti = ffstream(st);
414  if (mlv->pts >= st->duration)
415  return AVERROR_EOF;
416 
417  index = av_index_search_timestamp(st, mlv->pts, AVSEEK_FLAG_ANY);
418  if (index < 0) {
419  av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
420  return AVERROR(EIO);
421  }
422 
423  pb = mlv->pb[sti->index_entries[index].size];
424  if (!pb) {
425  ret = FFERROR_REDO;
426  goto next_packet;
427  }
428  avio_seek(pb, sti->index_entries[index].pos, SEEK_SET);
429 
430  avio_skip(pb, 4); // blockType
431  size = avio_rl32(pb);
432  if (size < 16)
433  return AVERROR_INVALIDDATA;
434  avio_skip(pb, 12); //timestamp, frameNumber
435  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
436  avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
437  space = avio_rl32(pb);
438  avio_skip(pb, space);
439 
440  if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
441  ret = AVERROR_PATCHWELCOME;
442  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
443  ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
444  } else { // AVMEDIA_TYPE_AUDIO
445  if (space > UINT_MAX - 24 || size < (24 + space))
446  return AVERROR_INVALIDDATA;
447  ret = av_get_packet(pb, pkt, size - (24 + space));
448  }
449 
450  if (ret < 0)
451  return ret;
452 
453  pkt->stream_index = mlv->stream_index;
454  pkt->pts = mlv->pts;
455 
456  ret = 0;
457 next_packet:
458  mlv->stream_index++;
459  if (mlv->stream_index == avctx->nb_streams) {
460  mlv->stream_index = 0;
461  mlv->pts++;
462  }
463  return ret;
464 }
465 
466 static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
467 {
468  MlvContext *mlv = avctx->priv_data;
469 
470  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
471  return AVERROR(ENOSYS);
472 
473  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
474  return AVERROR(EIO);
475 
476  mlv->pts = timestamp;
477  return 0;
478 }
479 
480 static int read_close(AVFormatContext *s)
481 {
482  MlvContext *mlv = s->priv_data;
483  int i;
484  for (i = 0; i < 100; i++)
485  ff_format_io_close(s, &mlv->pb[i]);
486  return 0;
487 }
488 
489 const AVInputFormat ff_mlv_demuxer = {
490  .name = "mlv",
491  .long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
492  .priv_data_size = sizeof(MlvContext),
493  .flags_internal = FF_FMT_INIT_CLEANUP,
494  .read_probe = probe,
495  .read_header = read_header,
496  .read_packet = read_packet,
497  .read_close = read_close,
498  .read_seek = read_seek,
499 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
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
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: options.c:237
MLV_VIDEO_CLASS_RAW
#define MLV_VIDEO_CLASS_RAW
Definition: mlvdec.c:37
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
space
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated space
Definition: undefined.txt:4
MLV_AUDIO_CLASS_WAV
#define MLV_AUDIO_CLASS_WAV
Definition: mlvdec.c:42
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2292
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
rational.h
ff_mlv_demuxer
const AVInputFormat ff_mlv_demuxer
Definition: mlvdec.c:489
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:63
MlvContext::stream_index
int stream_index
Definition: mlvdec.c:50
read_uint64
static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:112
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1281
read_string
static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
Definition: mlvdec.c:79
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2290
read_uint32
static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:107
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:65
scan_file
static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
Definition: mlvdec.c:117
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:815
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
framerate
int framerate
Definition: h264_levels.c:65
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: avformat.c:697
MlvContext
Definition: mlvdec.c:47
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:407
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2291
FFStream::index_entries_allocated_size
unsigned int index_entries_allocated_size
Definition: internal.h:255
AVIOContext::pos
int64_t pos
position in the file of the current buffer
Definition: avio.h:239
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:505
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
pts
static int64_t pts
Definition: transcode_aac.c:654
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:998
read_header
static int read_header(AVFormatContext *avctx)
Definition: mlvdec.c:257
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:743
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
read_seek
static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mlvdec.c:466
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
AVFormatContext::metadata
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1442
AVInputFormat
Definition: avformat.h:656
read_uint16
static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:102
MLV_VERSION
#define MLV_VERSION
Definition: mlvdec.c:35
width
#define width
read_uint8
static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:97
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
MlvContext::pb
AVIOContext * pb[101]
Definition: mlvdec.c:48
AV_PIX_FMT_BAYER_RGGB16LE
@ AV_PIX_FMT_BAYER_RGGB16LE
bayer, RGRG..(odd line), GBGB..(even line), 16-bit samples, little-endian
Definition: pixfmt.h:256
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:455
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:127
AVIndexEntry::size
int size
Definition: avformat.h:818
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:77
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
read_close
static int read_close(AVFormatContext *s)
Definition: mlvdec.c:480
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
MLV_VIDEO_CLASS_JPEG
#define MLV_VIDEO_CLASS_JPEG
Definition: mlvdec.c:39
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1255
read_packet
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mlvdec.c:400
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:254
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
index
int index
Definition: gxfenc.c:89
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:1000
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1269
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
AVIOContext
Bytestream IO Context.
Definition: avio.h:162
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
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:263
FFStream
Definition: internal.h:197
av_err2str
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:121
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1296
size
int size
Definition: twinvq_data.h:10344
ff_format_io_close
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: avformat.c:779
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
height
#define height
MLV_VIDEO_CLASS_YUV
#define MLV_VIDEO_CLASS_YUV
Definition: mlvdec.c:38
version
version
Definition: libkvazaar.c:313
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
FFERROR_REDO
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data).
Definition: demux.h:62
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:57
check_file_header
static int check_file_header(AVIOContext *pb, uint64_t guid)
Definition: mlvdec.c:63
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:367
AVCodecParameters::height
int height
Definition: codec_par.h:128
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
demux.h
ff_get_wav_header
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:94
ff_add_index_entry
int ff_add_index_entry(AVIndexEntry **index_entries, int *nb_index_entries, unsigned int *index_entries_allocated_size, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Internal version of av_add_index_entry.
Definition: seek.c:60
av_get_packet
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:102
MLV_VIDEO_CLASS_H264
#define MLV_VIDEO_CLASS_H264
Definition: mlvdec.c:40
tag
uint32_t tag
Definition: movenc.c:1646
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:962
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:948
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:41
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
AVFormatContext::io_open
int(* io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
A callback for opening new IO streams.
Definition: avformat.h:1773
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:808
MLV_CLASS_FLAG_DELTA
#define MLV_CLASS_FLAG_DELTA
Definition: mlvdec.c:44
AVPacket::stream_index
int stream_index
Definition: packet.h:376
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:252
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
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:628
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:280
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:103
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVCodecParameters::format
int format
Definition: codec_par.h:85
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
AVPacket
This structure stores compressed data.
Definition: packet.h:351
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
riff.h
avio_rl64
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:767
convert_header.str
string str
Definition: convert_header.py:20
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
MLV_CLASS_FLAG_LZMA
#define MLV_CLASS_FLAG_LZMA
Definition: mlvdec.c:45
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
probe
static int probe(const AVProbeData *p)
Definition: mlvdec.c:54
av_image_check_size
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:318
snprintf
#define snprintf
Definition: snprintf.h:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1241
MlvContext::class
int class[2]
Definition: mlvdec.c:49
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:354
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: seek.c:238
MlvContext::pts
uint64_t pts
Definition: mlvdec.c:51
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375
Generated on Wed Aug 24 2022 21:42:16 for FFmpeg by   doxygen 1.8.17