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/eval.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/rational.h"
31 #include "avformat.h"
32 #include "avio_internal.h"
33 #include "internal.h"
34 #include "riff.h"
35 
36 #define MLV_VERSION "v2.0"
37 
38 #define MLV_VIDEO_CLASS_RAW 1
39 #define MLV_VIDEO_CLASS_YUV 2
40 #define MLV_VIDEO_CLASS_JPEG 3
41 #define MLV_VIDEO_CLASS_H264 4
42 
43 #define MLV_AUDIO_CLASS_WAV 1
44 
45 #define MLV_CLASS_FLAG_DELTA 0x40
46 #define MLV_CLASS_FLAG_LZMA 0x80
47 
48 typedef struct {
49  AVIOContext *pb[101];
50  int class[2];
51  int stream_index;
52  uint64_t pts;
53 } MlvContext;
54 
55 static int probe(const AVProbeData *p)
56 {
57  if (AV_RL32(p->buf) == MKTAG('M','L','V','I') &&
58  AV_RL32(p->buf + 4) >= 52 &&
59  !memcmp(p->buf + 8, MLV_VERSION, 5))
60  return AVPROBE_SCORE_MAX;
61  return 0;
62 }
63 
64 static int check_file_header(AVIOContext *pb, uint64_t guid)
65 {
66  unsigned int size;
67  uint8_t version[8];
68 
69  avio_skip(pb, 4);
70  size = avio_rl32(pb);
71  if (size < 52)
72  return AVERROR_INVALIDDATA;
73  avio_read(pb, version, 8);
74  if (memcmp(version, MLV_VERSION, 5) || avio_rl64(pb) != guid)
75  return AVERROR_INVALIDDATA;
76  avio_skip(pb, size - 24);
77  return 0;
78 }
79 
80 static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
81 {
82  char * value = av_malloc(size + 1);
83  if (!value) {
84  avio_skip(pb, size);
85  return;
86  }
87 
88  avio_read(pb, value, size);
89  if (!value[0]) {
90  av_free(value);
91  return;
92  }
93 
94  value[size] = 0;
95  av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
96 }
97 
98 static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
99 {
100  av_dict_set_int(&avctx->metadata, tag, avio_r8(pb), 0);
101 }
102 
103 static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
104 {
105  av_dict_set_int(&avctx->metadata, tag, avio_rl16(pb), 0);
106 }
107 
108 static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
109 {
110  av_dict_set_int(&avctx->metadata, tag, avio_rl32(pb), 0);
111 }
112 
113 static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
114 {
115  av_dict_set_int(&avctx->metadata, tag, avio_rl64(pb), 0);
116 }
117 
118 static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
119 {
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  vst->codecpar->width = avio_rl16(pb);
134  vst->codecpar->height = avio_rl16(pb);
135  ret = av_image_check_size(vst->codecpar->width, vst->codecpar->height, 0, avctx);
136  if (ret < 0)
137  return ret;
138  if (avio_rl32(pb) != 1)
139  avpriv_request_sample(avctx, "raw api version");
140  avio_skip(pb, 20); // pointer, width, height, pitch, frame_size
141  vst->codecpar->bits_per_coded_sample = avio_rl32(pb);
142  if (vst->codecpar->bits_per_coded_sample < 0 ||
143  vst->codecpar->bits_per_coded_sample > (INT_MAX - 7) / (vst->codecpar->width * vst->codecpar->height)) {
144  av_log(avctx, AV_LOG_ERROR,
145  "invalid bits_per_coded_sample %d (size: %dx%d)\n",
146  vst->codecpar->bits_per_coded_sample,
147  vst->codecpar->width, vst->codecpar->height);
148  return AVERROR_INVALIDDATA;
149  }
150  avio_skip(pb, 8 + 16 + 24); // black_level, white_level, xywh, active_area, exposure_bias
151  if (avio_rl32(pb) != 0x2010100) /* RGGB */
152  avpriv_request_sample(avctx, "cfa_pattern");
153  avio_skip(pb, 80); // calibration_illuminant1, color_matrix1, dynamic_range
154  vst->codecpar->format = AV_PIX_FMT_BAYER_RGGB16LE;
155  vst->codecpar->codec_tag = MKTAG('B', 'I', 'T', 16);
156  size -= 164;
157  } else if (ast && type == MKTAG('W', 'A', 'V', 'I') && size >= 16) {
158  ret = ff_get_wav_header(avctx, pb, ast->codecpar, 16, 0);
159  if (ret < 0)
160  return ret;
161  size -= 16;
162  } else if (type == MKTAG('I','N','F','O')) {
163  if (size > 0)
164  read_string(avctx, pb, "info", size);
165  continue;
166  } else if (type == MKTAG('I','D','N','T') && size >= 36) {
167  read_string(avctx, pb, "cameraName", 32);
168  read_uint32(avctx, pb, "cameraModel", "0x%"PRIx32);
169  size -= 36;
170  if (size >= 32) {
171  read_string(avctx, pb, "cameraSerial", 32);
172  size -= 32;
173  }
174  } else if (type == MKTAG('L','E','N','S') && size >= 48) {
175  read_uint16(avctx, pb, "focalLength", "%i");
176  read_uint16(avctx, pb, "focalDist", "%i");
177  read_uint16(avctx, pb, "aperture", "%i");
178  read_uint8(avctx, pb, "stabilizerMode", "%i");
179  read_uint8(avctx, pb, "autofocusMode", "%i");
180  read_uint32(avctx, pb, "flags", "0x%"PRIx32);
181  read_uint32(avctx, pb, "lensID", "%"PRIi32);
182  read_string(avctx, pb, "lensName", 32);
183  size -= 48;
184  if (size >= 32) {
185  read_string(avctx, pb, "lensSerial", 32);
186  size -= 32;
187  }
188  } else if (vst && type == MKTAG('V', 'I', 'D', 'F') && size >= 4) {
189  uint64_t pts = avio_rl32(pb);
190  ff_add_index_entry(&vst->index_entries, &vst->nb_index_entries, &vst->index_entries_allocated_size,
191  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
192  size -= 4;
193  } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
194  uint64_t pts = avio_rl32(pb);
195  ff_add_index_entry(&ast->index_entries, &ast->nb_index_entries, &ast->index_entries_allocated_size,
196  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
197  size -= 4;
198  } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
199  read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
200  read_uint32(avctx, pb, "kelvin", "%"PRIi32);
201  read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
202  read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
203  read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
204  read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
205  read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
206  size -= 28;
207  } else if (type == MKTAG('R','T','C','I') && size >= 20) {
208  char str[32];
209  struct tm time = { 0 };
210  time.tm_sec = avio_rl16(pb);
211  time.tm_min = avio_rl16(pb);
212  time.tm_hour = avio_rl16(pb);
213  time.tm_mday = avio_rl16(pb);
214  time.tm_mon = avio_rl16(pb);
215  time.tm_year = avio_rl16(pb);
216  time.tm_wday = avio_rl16(pb);
217  time.tm_yday = avio_rl16(pb);
218  time.tm_isdst = avio_rl16(pb);
219  avio_skip(pb, 2);
220  if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
221  av_dict_set(&avctx->metadata, "time", str, 0);
222  size -= 20;
223  } else if (type == MKTAG('E','X','P','O') && size >= 16) {
224  av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
225  read_uint32(avctx, pb, "isoValue", "%"PRIi32);
226  read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
227  read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
228  size -= 16;
229  if (size >= 8) {
230  read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
231  size -= 8;
232  }
233  } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
234  read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
235  read_uint32(avctx, pb, "contrast", "%"PRIi32);
236  read_uint32(avctx, pb, "sharpness", "%"PRIi32);
237  read_uint32(avctx, pb, "saturation", "%"PRIi32);
238  read_uint32(avctx, pb, "colortone", "%"PRIi32);
239  read_string(avctx, pb, "picStyleName", 16);
240  size -= 36;
241  } else if (type == MKTAG('M','A','R','K')) {
242  } else if (type == MKTAG('N','U','L','L')) {
243  } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
244  } else {
245  av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
246  av_fourcc2str(type), size);
247  }
248  avio_skip(pb, size);
249  }
250  return 0;
251 }
252 
253 static int read_header(AVFormatContext *avctx)
254 {
255  MlvContext *mlv = avctx->priv_data;
256  AVIOContext *pb = avctx->pb;
257  AVStream *vst = NULL, *ast = NULL;
258  int size, ret;
259  unsigned nb_video_frames, nb_audio_frames;
260  uint64_t guid;
261  char guidstr[32];
262 
263  avio_skip(pb, 4);
264  size = avio_rl32(pb);
265  if (size < 52)
266  return AVERROR_INVALIDDATA;
267 
268  avio_skip(pb, 8);
269 
270  guid = avio_rl64(pb);
271  snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
272  av_dict_set(&avctx->metadata, "guid", guidstr, 0);
273 
274  avio_skip(pb, 8); //fileNum, fileCount, fileFlags
275 
276  mlv->class[0] = avio_rl16(pb);
277  mlv->class[1] = avio_rl16(pb);
278 
279  nb_video_frames = avio_rl32(pb);
280  nb_audio_frames = avio_rl32(pb);
281 
282  if (nb_video_frames && mlv->class[0]) {
283  vst = avformat_new_stream(avctx, NULL);
284  if (!vst)
285  return AVERROR(ENOMEM);
286  vst->id = 0;
287  vst->nb_frames = nb_video_frames;
288  if ((mlv->class[0] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)))
289  avpriv_request_sample(avctx, "compression");
290  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
291  switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
292  case MLV_VIDEO_CLASS_RAW:
293  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
294  break;
295  case MLV_VIDEO_CLASS_YUV:
296  vst->codecpar->format = AV_PIX_FMT_YUV420P;
297  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
298  vst->codecpar->codec_tag = 0;
299  break;
300  case MLV_VIDEO_CLASS_JPEG:
301  vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
302  vst->codecpar->codec_tag = 0;
303  break;
304  case MLV_VIDEO_CLASS_H264:
305  vst->codecpar->codec_id = AV_CODEC_ID_H264;
306  vst->codecpar->codec_tag = 0;
307  break;
308  default:
309  avpriv_request_sample(avctx, "unknown video class");
310  }
311  }
312 
313  if (nb_audio_frames && mlv->class[1]) {
314  ast = avformat_new_stream(avctx, NULL);
315  if (!ast)
316  return AVERROR(ENOMEM);
317  ast->id = 1;
318  ast->nb_frames = nb_audio_frames;
319  if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
320  avpriv_request_sample(avctx, "compression");
321  if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
322  avpriv_request_sample(avctx, "unknown audio class");
323 
324  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
325  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
326  }
327 
328  if (vst) {
329  AVRational framerate;
330  framerate.num = avio_rl32(pb);
331  framerate.den = avio_rl32(pb);
332  avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
333  } else
334  avio_skip(pb, 8);
335 
336  avio_skip(pb, size - 52);
337 
338  /* scan primary file */
339  mlv->pb[100] = avctx->pb;
340  ret = scan_file(avctx, vst, ast, 100);
341  if (ret < 0)
342  return ret;
343 
344  /* scan secondary files */
345  if (strlen(avctx->url) > 2) {
346  int i;
347  char *filename = av_strdup(avctx->url);
348 
349  if (!filename)
350  return AVERROR(ENOMEM);
351 
352  for (i = 0; i < 100; i++) {
353  snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
354  if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
355  break;
356  if (check_file_header(mlv->pb[i], guid) < 0) {
357  av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
358  ff_format_io_close(avctx, &mlv->pb[i]);
359  continue;
360  }
361  av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
362  ret = scan_file(avctx, vst, ast, i);
363  if (ret < 0) {
364  av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
365  ff_format_io_close(avctx, &mlv->pb[i]);
366  continue;
367  }
368  }
369  av_free(filename);
370  }
371 
372  if (vst)
373  vst->duration = vst->nb_index_entries;
374  if (ast)
375  ast->duration = ast->nb_index_entries;
376 
377  if ((vst && !vst->nb_index_entries) || (ast && !ast->nb_index_entries)) {
378  av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
379  return AVERROR_INVALIDDATA;
380  }
381 
382  if (vst && ast)
383  avio_seek(pb, FFMIN(vst->index_entries[0].pos, ast->index_entries[0].pos), SEEK_SET);
384  else if (vst)
385  avio_seek(pb, vst->index_entries[0].pos, SEEK_SET);
386  else if (ast)
387  avio_seek(pb, ast->index_entries[0].pos, SEEK_SET);
388 
389  return 0;
390 }
391 
392 static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
393 {
394  MlvContext *mlv = avctx->priv_data;
395  AVIOContext *pb;
396  AVStream *st;
397  int index, ret;
398  unsigned int size, space;
399 
400  if (!avctx->nb_streams)
401  return AVERROR_EOF;
402 
403  st = avctx->streams[mlv->stream_index];
404  if (mlv->pts >= st->duration)
405  return AVERROR_EOF;
406 
407  index = av_index_search_timestamp(st, mlv->pts, AVSEEK_FLAG_ANY);
408  if (index < 0) {
409  av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
410  return AVERROR(EIO);
411  }
412 
413  pb = mlv->pb[st->index_entries[index].size];
414  avio_seek(pb, st->index_entries[index].pos, SEEK_SET);
415 
416  avio_skip(pb, 4); // blockType
417  size = avio_rl32(pb);
418  if (size < 16)
419  return AVERROR_INVALIDDATA;
420  avio_skip(pb, 12); //timestamp, frameNumber
421  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
422  avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
423  space = avio_rl32(pb);
424  avio_skip(pb, space);
425 
426  if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
427  ret = AVERROR_PATCHWELCOME;
428  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
429  ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
430  } else { // AVMEDIA_TYPE_AUDIO
431  if (space > UINT_MAX - 24 || size < (24 + space))
432  return AVERROR_INVALIDDATA;
433  ret = av_get_packet(pb, pkt, size - (24 + space));
434  }
435 
436  if (ret < 0)
437  return ret;
438 
439  pkt->stream_index = mlv->stream_index;
440  pkt->pts = mlv->pts;
441 
442  mlv->stream_index++;
443  if (mlv->stream_index == avctx->nb_streams) {
444  mlv->stream_index = 0;
445  mlv->pts++;
446  }
447  return 0;
448 }
449 
450 static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
451 {
452  MlvContext *mlv = avctx->priv_data;
453 
454  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
455  return AVERROR(ENOSYS);
456 
457  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
458  return AVERROR(EIO);
459 
460  mlv->pts = timestamp;
461  return 0;
462 }
463 
464 static int read_close(AVFormatContext *s)
465 {
466  MlvContext *mlv = s->priv_data;
467  int i;
468  for (i = 0; i < 100; i++)
469  if (mlv->pb[i])
470  ff_format_io_close(s, &mlv->pb[i]);
471  return 0;
472 }
473 
474 AVInputFormat ff_mlv_demuxer = {
475  .name = "mlv",
476  .long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
477  .priv_data_size = sizeof(MlvContext),
478  .read_probe = probe,
479  .read_header = read_header,
480  .read_packet = read_packet,
481  .read_close = read_close,
482  .read_seek = read_seek,
483 };
AVStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1099
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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: utils.c:4480
MLV_VIDEO_CLASS_RAW
#define MLV_VIDEO_CLASS_RAW
Definition: mlvdec.c:38
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3953
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:43
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2498
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:366
rational.h
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: avcodec.h:231
MlvContext::stream_index
int stream_index
Definition: mlvdec.c:51
read_uint64
static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:113
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
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: utils.c:1997
read_string
static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
Definition: mlvdec.c:80
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2496
read_uint32
static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:108
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3961
scan_file
static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
Definition: mlvdec.c:118
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:808
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
framerate
int framerate
Definition: h264_levels.c:65
fmt
const char * fmt
Definition: avisynth_c.h:861
MlvContext
Definition: mlvdec.c:48
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2497
ff_mlv_demuxer
AVInputFormat ff_mlv_demuxer
Definition: mlvdec.c:474
AVIOContext::pos
int64_t pos
position in the file of the current buffer
Definition: avio.h:238
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
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:647
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:919
read_header
static int read_header(AVFormatContext *avctx)
Definition: mlvdec.c:253
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:753
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:74
read_seek
static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mlvdec.c:450
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVFormatContext::metadata
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1582
AVInputFormat
Definition: avformat.h:640
read_uint16
static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:103
MLV_VERSION
#define MLV_VERSION
Definition: mlvdec.c:36
read_uint8
static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:98
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
MlvContext::pb
AVIOContext * pb[101]
Definition: mlvdec.c:49
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:266
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: avcodec.h:4023
AVIndexEntry::size
int size
Definition: avformat.h:811
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: avcodec.h:245
version
int version
Definition: avisynth_c.h:858
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1017
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
read_close
static int read_close(AVFormatContext *s)
Definition: mlvdec.c:464
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:40
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
read_packet
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mlvdec.c:392
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
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:921
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
eval.h
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:769
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
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:188
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
AVStream::nb_index_entries
int nb_index_entries
Definition: avformat.h:1101
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:119
avpriv_set_pts_info
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:4910
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1438
size
int size
Definition: twinvq_data.h:11134
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:638
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
MLV_VIDEO_CLASS_YUV
#define MLV_VIDEO_CLASS_YUV
Definition: mlvdec.c:39
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: avcodec.h:225
check_file_header
static int check_file_header(AVIOContext *pb, uint64_t guid)
Definition: mlvdec.c:64
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
avio_internal.h
AVCodecParameters::height
int height
Definition: avcodec.h:4024
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
uint8_t
uint8_t
Definition: audio_convert.c:194
ff_get_wav_header
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:91
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:313
MLV_VIDEO_CLASS_H264
#define MLV_VIDEO_CLASS_H264
Definition: mlvdec.c:41
tag
uint32_t tag
Definition: movenc.c:1496
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:877
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:870
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:88
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:647
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:1924
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:801
MLV_CLASS_FLAG_DELTA
#define MLV_CLASS_FLAG_DELTA
Definition: mlvdec.c:45
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1479
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
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
ff_format_io_close
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:5665
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:654
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
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: avcodec.h:3999
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
AVCodecParameters::format
int format
Definition: avcodec.h:3981
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
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:777
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:565
MLV_CLASS_FLAG_LZMA
#define MLV_CLASS_FLAG_LZMA
Definition: mlvdec.c:46
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:59
probe
static int probe(const AVProbeData *p)
Definition: mlvdec.c:55
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:282
snprintf
#define snprintf
Definition: snprintf.h:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1370
MlvContext::class
int class[2]
Definition: mlvdec.c:50
AVStream::index_entries_allocated_size
unsigned int index_entries_allocated_size
Definition: avformat.h:1102
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2167
MlvContext::pts
uint64_t pts
Definition: mlvdec.c:52
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
Generated on Wed Aug 24 2022 21:27:21 for FFmpeg by   doxygen 1.8.17