FFmpeg
mlvdec.c
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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 <time.h>
28 
29 #include "libavutil/imgutils.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/rational.h"
32 #include "avformat.h"
33 #include "demux.h"
34 #include "internal.h"
35 #include "riff.h"
36 
37 #define MLV_VERSION "v2.0"
38 
39 #define MLV_VIDEO_CLASS_RAW 1
40 #define MLV_VIDEO_CLASS_YUV 2
41 #define MLV_VIDEO_CLASS_JPEG 3
42 #define MLV_VIDEO_CLASS_H264 4
43 
44 #define MLV_AUDIO_CLASS_WAV 1
45 
46 #define MLV_CLASS_FLAG_DELTA 0x40
47 #define MLV_CLASS_FLAG_LZMA 0x80
48 
49 typedef struct {
50  AVIOContext *pb[101];
51  int class[2];
53  uint64_t pts;
54 } MlvContext;
55 
56 static int probe(const AVProbeData *p)
57 {
58  if (AV_RL32(p->buf) == MKTAG('M','L','V','I') &&
59  AV_RL32(p->buf + 4) >= 52 &&
60  !memcmp(p->buf + 8, MLV_VERSION, 5))
61  return AVPROBE_SCORE_MAX;
62  return 0;
63 }
64 
65 static int check_file_header(AVIOContext *pb, uint64_t guid)
66 {
67  unsigned int size;
68  uint8_t version[8];
69 
70  avio_skip(pb, 4);
71  size = avio_rl32(pb);
72  if (size < 52)
73  return AVERROR_INVALIDDATA;
74  avio_read(pb, version, 8);
75  if (memcmp(version, MLV_VERSION, 5) || avio_rl64(pb) != guid)
76  return AVERROR_INVALIDDATA;
77  avio_skip(pb, size - 24);
78  return 0;
79 }
80 
81 static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
82 {
83  char * value = av_malloc(size + 1);
84  if (!value) {
85  avio_skip(pb, size);
86  return;
87  }
88 
89  avio_read(pb, value, size);
90  if (!value[0]) {
91  av_free(value);
92  return;
93  }
94 
95  value[size] = 0;
97 }
98 
99 static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
100 {
101  av_dict_set_int(&avctx->metadata, tag, avio_r8(pb), 0);
102 }
103 
104 static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
105 {
106  av_dict_set_int(&avctx->metadata, tag, avio_rl16(pb), 0);
107 }
108 
109 static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
110 {
111  av_dict_set_int(&avctx->metadata, tag, avio_rl32(pb), 0);
112 }
113 
114 static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
115 {
116  av_dict_set_int(&avctx->metadata, tag, avio_rl64(pb), 0);
117 }
118 
119 static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
120 {
121  FFStream *const vsti = ffstream(vst), *const asti = ffstream(ast);
122  MlvContext *mlv = avctx->priv_data;
123  AVIOContext *pb = mlv->pb[file];
124  int ret;
125  while (!avio_feof(pb)) {
126  int type;
127  unsigned int size;
128  type = avio_rl32(pb);
129  size = avio_rl32(pb);
130  avio_skip(pb, 8); //timestamp
131  if (size < 16)
132  break;
133  size -= 16;
134  if (vst && type == MKTAG('R','A','W','I') && size >= 164) {
135  unsigned width = avio_rl16(pb);
136  unsigned height = avio_rl16(pb);
137  unsigned bits_per_coded_sample;
138  ret = av_image_check_size(width, height, 0, avctx);
139  if (ret < 0)
140  return ret;
141  if (avio_rl32(pb) != 1)
142  avpriv_request_sample(avctx, "raw api version");
143  avio_skip(pb, 20); // pointer, width, height, pitch, frame_size
144  bits_per_coded_sample = avio_rl32(pb);
145  if (bits_per_coded_sample > (INT_MAX - 7) / (width * height)) {
146  av_log(avctx, AV_LOG_ERROR,
147  "invalid bits_per_coded_sample %u (size: %ux%u)\n",
148  bits_per_coded_sample, width, height);
149  return AVERROR_INVALIDDATA;
150  }
151  vst->codecpar->width = width;
152  vst->codecpar->height = height;
153  vst->codecpar->bits_per_coded_sample = bits_per_coded_sample;
154  avio_skip(pb, 8 + 16 + 24); // black_level, white_level, xywh, active_area, exposure_bias
155  if (avio_rl32(pb) != 0x2010100) /* RGGB */
156  avpriv_request_sample(avctx, "cfa_pattern");
157  avio_skip(pb, 80); // calibration_illuminant1, color_matrix1, dynamic_range
159  vst->codecpar->codec_tag = MKTAG('B', 'I', 'T', 16);
160  size -= 164;
161  } else if (ast && type == MKTAG('W', 'A', 'V', 'I') && size >= 16) {
162  ret = ff_get_wav_header(avctx, pb, ast->codecpar, 16, 0);
163  if (ret < 0)
164  return ret;
165  size -= 16;
166  } else if (type == MKTAG('I','N','F','O')) {
167  if (size > 0)
168  read_string(avctx, pb, "info", size);
169  continue;
170  } else if (type == MKTAG('I','D','N','T') && size >= 36) {
171  read_string(avctx, pb, "cameraName", 32);
172  read_uint32(avctx, pb, "cameraModel", "0x%"PRIx32);
173  size -= 36;
174  if (size >= 32) {
175  read_string(avctx, pb, "cameraSerial", 32);
176  size -= 32;
177  }
178  } else if (type == MKTAG('L','E','N','S') && size >= 48) {
179  read_uint16(avctx, pb, "focalLength", "%i");
180  read_uint16(avctx, pb, "focalDist", "%i");
181  read_uint16(avctx, pb, "aperture", "%i");
182  read_uint8(avctx, pb, "stabilizerMode", "%i");
183  read_uint8(avctx, pb, "autofocusMode", "%i");
184  read_uint32(avctx, pb, "flags", "0x%"PRIx32);
185  read_uint32(avctx, pb, "lensID", "%"PRIi32);
186  read_string(avctx, pb, "lensName", 32);
187  size -= 48;
188  if (size >= 32) {
189  read_string(avctx, pb, "lensSerial", 32);
190  size -= 32;
191  }
192  } else if (vst && type == MKTAG('V', 'I', 'D', 'F') && size >= 4) {
193  uint64_t pts = avio_rl32(pb);
196  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
197  size -= 4;
198  } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
199  uint64_t pts = avio_rl32(pb);
200  ff_add_index_entry(&asti->index_entries, &asti->nb_index_entries,
201  &asti->index_entries_allocated_size,
202  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
203  size -= 4;
204  } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
205  read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
206  read_uint32(avctx, pb, "kelvin", "%"PRIi32);
207  read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
208  read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
209  read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
210  read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
211  read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
212  size -= 28;
213  } else if (type == MKTAG('R','T','C','I') && size >= 20) {
214  char str[32];
215  struct tm time = { 0 };
216  time.tm_sec = avio_rl16(pb);
217  time.tm_min = avio_rl16(pb);
218  time.tm_hour = avio_rl16(pb);
219  time.tm_mday = avio_rl16(pb);
220  time.tm_mon = avio_rl16(pb);
221  time.tm_year = avio_rl16(pb);
222  time.tm_wday = avio_rl16(pb);
223  time.tm_yday = avio_rl16(pb);
224  time.tm_isdst = avio_rl16(pb);
225  avio_skip(pb, 2);
226  if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
227  av_dict_set(&avctx->metadata, "time", str, 0);
228  size -= 20;
229  } else if (type == MKTAG('E','X','P','O') && size >= 16) {
230  av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
231  read_uint32(avctx, pb, "isoValue", "%"PRIi32);
232  read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
233  read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
234  size -= 16;
235  if (size >= 8) {
236  read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
237  size -= 8;
238  }
239  } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
240  read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
241  read_uint32(avctx, pb, "contrast", "%"PRIi32);
242  read_uint32(avctx, pb, "sharpness", "%"PRIi32);
243  read_uint32(avctx, pb, "saturation", "%"PRIi32);
244  read_uint32(avctx, pb, "colortone", "%"PRIi32);
245  read_string(avctx, pb, "picStyleName", 16);
246  size -= 36;
247  } else if (type == MKTAG('M','A','R','K')) {
248  } else if (type == MKTAG('N','U','L','L')) {
249  } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
250  } else {
251  av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
253  }
254  avio_skip(pb, size);
255  }
256  return 0;
257 }
258 
259 static int read_header(AVFormatContext *avctx)
260 {
261  MlvContext *mlv = avctx->priv_data;
262  AVIOContext *pb = avctx->pb;
263  AVStream *vst = NULL, *ast = NULL;
264  FFStream *vsti = NULL, *asti = NULL;
265  int size, ret;
266  unsigned nb_video_frames, nb_audio_frames;
267  uint64_t guid;
268  char guidstr[32];
269 
270  avio_skip(pb, 4);
271  size = avio_rl32(pb);
272  if (size < 52)
273  return AVERROR_INVALIDDATA;
274 
275  avio_skip(pb, 8);
276 
277  guid = avio_rl64(pb);
278  snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
279  av_dict_set(&avctx->metadata, "guid", guidstr, 0);
280 
281  avio_skip(pb, 8); //fileNum, fileCount, fileFlags
282 
283  mlv->class[0] = avio_rl16(pb);
284  mlv->class[1] = avio_rl16(pb);
285 
286  nb_video_frames = avio_rl32(pb);
287  nb_audio_frames = avio_rl32(pb);
288 
289  if (nb_video_frames && mlv->class[0]) {
290  vst = avformat_new_stream(avctx, NULL);
291  if (!vst)
292  return AVERROR(ENOMEM);
293  vsti = ffstream(vst);
294 
295  vst->id = 0;
296  vst->nb_frames = nb_video_frames;
298  avpriv_request_sample(avctx, "compression");
300  switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
301  case MLV_VIDEO_CLASS_RAW:
303  break;
304  case MLV_VIDEO_CLASS_YUV:
307  vst->codecpar->codec_tag = 0;
308  break;
311  vst->codecpar->codec_tag = 0;
312  break;
315  vst->codecpar->codec_tag = 0;
316  break;
317  default:
318  avpriv_request_sample(avctx, "unknown video class");
319  }
320  }
321 
322  if (nb_audio_frames && mlv->class[1]) {
323  ast = avformat_new_stream(avctx, NULL);
324  if (!ast)
325  return AVERROR(ENOMEM);
326  asti = ffstream(ast);
327  ast->id = 1;
328  ast->nb_frames = nb_audio_frames;
329  if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
330  avpriv_request_sample(avctx, "compression");
331  if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
332  avpriv_request_sample(avctx, "unknown audio class");
333 
334  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
335  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
336  }
337 
338  if (vst) {
340  framerate.num = avio_rl32(pb);
341  framerate.den = avio_rl32(pb);
342  avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
343  } else
344  avio_skip(pb, 8);
345 
346  avio_skip(pb, size - 52);
347 
348  /* scan primary file */
349  mlv->pb[100] = avctx->pb;
350  ret = scan_file(avctx, vst, ast, 100);
351  if (ret < 0)
352  return ret;
353 
354  /* scan secondary files */
355  if (strlen(avctx->url) > 2) {
356  int i;
357  char *filename = av_strdup(avctx->url);
358 
359  if (!filename)
360  return AVERROR(ENOMEM);
361 
362  for (i = 0; i < 100; i++) {
363  snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
364  if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
365  break;
366  if (check_file_header(mlv->pb[i], guid) < 0) {
367  av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
368  ff_format_io_close(avctx, &mlv->pb[i]);
369  continue;
370  }
371  av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
372  ret = scan_file(avctx, vst, ast, i);
373  if (ret < 0) {
374  av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
375  ff_format_io_close(avctx, &mlv->pb[i]);
376  continue;
377  }
378  }
379  av_free(filename);
380  }
381 
382  if (vst)
383  vst->duration = vsti->nb_index_entries;
384  if (ast)
385  ast->duration = asti->nb_index_entries;
386 
387  if ((vst && !vsti->nb_index_entries) || (ast && !asti->nb_index_entries)) {
388  av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
389  return AVERROR_INVALIDDATA;
390  }
391 
392  if (vst && ast)
393  avio_seek(pb, FFMIN(vsti->index_entries[0].pos, asti->index_entries[0].pos), SEEK_SET);
394  else if (vst)
395  avio_seek(pb, vsti->index_entries[0].pos, SEEK_SET);
396  else if (ast)
397  avio_seek(pb, asti->index_entries[0].pos, SEEK_SET);
398 
399  return 0;
400 }
401 
403 {
404  MlvContext *mlv = avctx->priv_data;
405  AVIOContext *pb;
406  AVStream *st;
407  FFStream *sti;
408  int index, ret;
409  unsigned int size, space;
410 
411  if (!avctx->nb_streams)
412  return AVERROR_EOF;
413 
414  st = avctx->streams[mlv->stream_index];
415  sti = ffstream(st);
416  if (mlv->pts >= st->duration)
417  return AVERROR_EOF;
418 
420  if (index < 0) {
421  av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
422  return AVERROR(EIO);
423  }
424 
425  pb = mlv->pb[sti->index_entries[index].size];
426  if (!pb) {
427  ret = FFERROR_REDO;
428  goto next_packet;
429  }
430  avio_seek(pb, sti->index_entries[index].pos, SEEK_SET);
431 
432  avio_skip(pb, 4); // blockType
433  size = avio_rl32(pb);
434  if (size < 16)
435  return AVERROR_INVALIDDATA;
436  avio_skip(pb, 12); //timestamp, frameNumber
438  avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
439  space = avio_rl32(pb);
440  avio_skip(pb, space);
441 
442  if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
444  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
445  ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
446  } else { // AVMEDIA_TYPE_AUDIO
447  if (space > UINT_MAX - 24 || size < (24 + space))
448  return AVERROR_INVALIDDATA;
449  ret = av_get_packet(pb, pkt, size - (24 + space));
450  }
451 
452  if (ret < 0)
453  return ret;
454 
455  pkt->stream_index = mlv->stream_index;
456  pkt->pts = mlv->pts;
457 
458  ret = 0;
459 next_packet:
460  mlv->stream_index++;
461  if (mlv->stream_index == avctx->nb_streams) {
462  mlv->stream_index = 0;
463  mlv->pts++;
464  }
465  return ret;
466 }
467 
468 static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
469 {
470  MlvContext *mlv = avctx->priv_data;
471 
473  return AVERROR(ENOSYS);
474 
475  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
476  return AVERROR(EIO);
477 
478  mlv->pts = timestamp;
479  return 0;
480 }
481 
483 {
484  MlvContext *mlv = s->priv_data;
485  int i;
486  for (i = 0; i < 100; i++)
487  ff_format_io_close(s, &mlv->pb[i]);
488  return 0;
489 }
490 
492  .name = "mlv",
493  .long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
494  .priv_data_size = sizeof(MlvContext),
495  .flags_internal = FF_FMT_INIT_CLEANUP,
496  .read_probe = probe,
500  .read_seek = read_seek,
501 };
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:46
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
MLV_VIDEO_CLASS_RAW
#define MLV_VIDEO_CLASS_RAW
Definition: mlvdec.c:39
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
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:44
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2551
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
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:491
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:65
MlvContext::stream_index
int stream_index
Definition: mlvdec.c:52
read_uint64
static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:114
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1431
read_string
static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
Definition: mlvdec.c:81
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2549
read_uint32
static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:109
ff_get_wav_header
int ff_get_wav_header(void *logctx, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:94
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:59
scan_file
static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
Definition: mlvdec.c:119
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:708
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:464
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:843
MlvContext
Definition: mlvdec.c:49
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:423
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2550
FFStream::index_entries_allocated_size
unsigned int index_entries_allocated_size
Definition: internal.h:258
AVIOContext::pos
int64_t pos
position in the file of the current buffer
Definition: avio.h:247
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:513
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:643
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:900
read_header
static int read_header(AVFormatContext *avctx)
Definition: mlvdec.c:259
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:761
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:79
read_seek
static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mlvdec.c:468
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:1591
AVInputFormat
Definition: avformat.h:549
read_uint16
static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:104
MLV_VERSION
#define MLV_VERSION
Definition: mlvdec.c:37
width
#define width
read_uint8
static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:99
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
MlvContext::pb
AVIOContext * pb[101]
Definition: mlvdec.c:50
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:291
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:554
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:454
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:121
AVIndexEntry::size
int size
Definition: avformat.h:711
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:73
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
AVFormatContext
Format I/O context.
Definition: avformat.h:1363
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:864
framerate
float framerate
Definition: av1_levels.c:29
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:482
MLV_VIDEO_CLASS_JPEG
#define MLV_VIDEO_CLASS_JPEG
Definition: mlvdec.c:41
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1405
read_packet
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mlvdec.c:402
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:257
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:452
time.h
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:902
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1419
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:777
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
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:106
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:271
FFStream
Definition: internal.h:199
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:1446
size
int size
Definition: twinvq_data.h:10344
ff_format_io_close
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: avformat.c:934
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:650
height
#define height
MLV_VIDEO_CLASS_YUV
#define MLV_VIDEO_CLASS_YUV
Definition: mlvdec.c:40
version
version
Definition: libkvazaar.c:321
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:59
check_file_header
static int check_file_header(AVIOContext *pb, uint64_t guid)
Definition: mlvdec.c:65
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:515
AVCodecParameters::height
int height
Definition: codec_par.h:122
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_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:62
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:103
MLV_VIDEO_CLASS_H264
#define MLV_VIDEO_CLASS_H264
Definition: mlvdec.c:42
tag
uint32_t tag
Definition: movenc.c:1786
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:853
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:841
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:278
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:659
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:1922
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:701
MLV_CLASS_FLAG_DELTA
#define MLV_CLASS_FLAG_DELTA
Definition: mlvdec.c:46
AVPacket::stream_index
int stream_index
Definition: packet.h:524
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:365
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:255
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:169
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:636
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:270
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:29
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:97
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVCodecParameters::format
int format
Definition: codec_par.h:79
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:55
AVPacket
This structure stores compressed data.
Definition: packet.h:499
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:88
riff.h
avio_rl64
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:785
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
MLV_CLASS_FLAG_LZMA
#define MLV_CLASS_FLAG_LZMA
Definition: mlvdec.c:47
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:56
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:1391
MlvContext::class
int class[2]
Definition: mlvdec.c:51
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:358
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:243
MlvContext::pts
uint64_t pts
Definition: mlvdec.c:53
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:393