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/mem.h"
32 #include "libavutil/rational.h"
33 #include "avformat.h"
34 #include "demux.h"
35 #include "internal.h"
36 #include "riff.h"
37 
38 #define MLV_VERSION "v2.0"
39 
40 #define MLV_VIDEO_CLASS_RAW 1
41 #define MLV_VIDEO_CLASS_YUV 2
42 #define MLV_VIDEO_CLASS_JPEG 3
43 #define MLV_VIDEO_CLASS_H264 4
44 
45 #define MLV_AUDIO_CLASS_WAV 1
46 
47 #define MLV_CLASS_FLAG_DELTA 0x40
48 #define MLV_CLASS_FLAG_LZMA 0x80
49 
50 typedef struct {
51  AVIOContext *pb[101];
52  int class[2];
53  int stream_index;
54  uint64_t pts;
55 } MlvContext;
56 
57 static int probe(const AVProbeData *p)
58 {
59  if (AV_RL32(p->buf) == MKTAG('M','L','V','I') &&
60  AV_RL32(p->buf + 4) >= 52 &&
61  !memcmp(p->buf + 8, MLV_VERSION, 5))
62  return AVPROBE_SCORE_MAX;
63  return 0;
64 }
65 
66 static int check_file_header(AVIOContext *pb, uint64_t guid)
67 {
68  unsigned int size;
69  uint8_t version[8];
70 
71  avio_skip(pb, 4);
72  size = avio_rl32(pb);
73  if (size < 52)
74  return AVERROR_INVALIDDATA;
75  avio_read(pb, version, 8);
76  if (memcmp(version, MLV_VERSION, 5) || avio_rl64(pb) != guid)
77  return AVERROR_INVALIDDATA;
78  avio_skip(pb, size - 24);
79  return 0;
80 }
81 
82 static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
83 {
84  char * value = av_malloc(size + 1);
85  if (!value) {
86  avio_skip(pb, size);
87  return;
88  }
89 
90  avio_read(pb, value, size);
91  if (!value[0]) {
92  av_free(value);
93  return;
94  }
95 
96  value[size] = 0;
97  av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
98 }
99 
100 static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
101 {
102  av_dict_set_int(&avctx->metadata, tag, avio_r8(pb), 0);
103 }
104 
105 static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
106 {
107  av_dict_set_int(&avctx->metadata, tag, avio_rl16(pb), 0);
108 }
109 
110 static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
111 {
112  av_dict_set_int(&avctx->metadata, tag, avio_rl32(pb), 0);
113 }
114 
115 static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
116 {
117  av_dict_set_int(&avctx->metadata, tag, avio_rl64(pb), 0);
118 }
119 
120 static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
121 {
122  FFStream *const vsti = ffstream(vst), *const asti = ffstream(ast);
123  MlvContext *mlv = avctx->priv_data;
124  AVIOContext *pb = mlv->pb[file];
125  int ret;
126  while (!avio_feof(pb)) {
127  int type;
128  unsigned int size;
129  type = avio_rl32(pb);
130  size = avio_rl32(pb);
131  avio_skip(pb, 8); //timestamp
132  if (size < 16)
133  break;
134  size -= 16;
135  if (vst && type == MKTAG('R','A','W','I') && size >= 164) {
136  unsigned width = avio_rl16(pb);
137  unsigned height = avio_rl16(pb);
138  unsigned bits_per_coded_sample;
139  ret = av_image_check_size(width, height, 0, avctx);
140  if (ret < 0)
141  return ret;
142  if (avio_rl32(pb) != 1)
143  avpriv_request_sample(avctx, "raw api version");
144  avio_skip(pb, 20); // pointer, width, height, pitch, frame_size
145  bits_per_coded_sample = avio_rl32(pb);
146  if (bits_per_coded_sample > (INT_MAX - 7) / (width * height)) {
147  av_log(avctx, AV_LOG_ERROR,
148  "invalid bits_per_coded_sample %u (size: %ux%u)\n",
149  bits_per_coded_sample, width, height);
150  return AVERROR_INVALIDDATA;
151  }
152  vst->codecpar->width = width;
153  vst->codecpar->height = height;
154  vst->codecpar->bits_per_coded_sample = bits_per_coded_sample;
155  avio_skip(pb, 8 + 16 + 24); // black_level, white_level, xywh, active_area, exposure_bias
156  if (avio_rl32(pb) != 0x2010100) /* RGGB */
157  avpriv_request_sample(avctx, "cfa_pattern");
158  avio_skip(pb, 80); // calibration_illuminant1, color_matrix1, dynamic_range
159  vst->codecpar->format = AV_PIX_FMT_BAYER_RGGB16LE;
160  vst->codecpar->codec_tag = MKTAG('B', 'I', 'T', 16);
161  size -= 164;
162  } else if (ast && type == MKTAG('W', 'A', 'V', 'I') && size >= 16) {
163  ret = ff_get_wav_header(avctx, pb, ast->codecpar, 16, 0);
164  if (ret < 0)
165  return ret;
166  size -= 16;
167  } else if (type == MKTAG('I','N','F','O')) {
168  if (size > 0)
169  read_string(avctx, pb, "info", size);
170  continue;
171  } else if (type == MKTAG('I','D','N','T') && size >= 36) {
172  read_string(avctx, pb, "cameraName", 32);
173  read_uint32(avctx, pb, "cameraModel", "0x%"PRIx32);
174  size -= 36;
175  if (size >= 32) {
176  read_string(avctx, pb, "cameraSerial", 32);
177  size -= 32;
178  }
179  } else if (type == MKTAG('L','E','N','S') && size >= 48) {
180  read_uint16(avctx, pb, "focalLength", "%i");
181  read_uint16(avctx, pb, "focalDist", "%i");
182  read_uint16(avctx, pb, "aperture", "%i");
183  read_uint8(avctx, pb, "stabilizerMode", "%i");
184  read_uint8(avctx, pb, "autofocusMode", "%i");
185  read_uint32(avctx, pb, "flags", "0x%"PRIx32);
186  read_uint32(avctx, pb, "lensID", "%"PRIi32);
187  read_string(avctx, pb, "lensName", 32);
188  size -= 48;
189  if (size >= 32) {
190  read_string(avctx, pb, "lensSerial", 32);
191  size -= 32;
192  }
193  } else if (vst && type == MKTAG('V', 'I', 'D', 'F') && size >= 4) {
194  uint64_t pts = avio_rl32(pb);
195  ff_add_index_entry(&vsti->index_entries, &vsti->nb_index_entries,
196  &vsti->index_entries_allocated_size,
197  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
198  size -= 4;
199  } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
200  uint64_t pts = avio_rl32(pb);
201  ff_add_index_entry(&asti->index_entries, &asti->nb_index_entries,
202  &asti->index_entries_allocated_size,
203  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
204  size -= 4;
205  } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
206  read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
207  read_uint32(avctx, pb, "kelvin", "%"PRIi32);
208  read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
209  read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
210  read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
211  read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
212  read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
213  size -= 28;
214  } else if (type == MKTAG('R','T','C','I') && size >= 20) {
215  char str[32];
216  struct tm time = { 0 };
217  time.tm_sec = avio_rl16(pb);
218  time.tm_min = avio_rl16(pb);
219  time.tm_hour = avio_rl16(pb);
220  time.tm_mday = avio_rl16(pb);
221  time.tm_mon = avio_rl16(pb);
222  time.tm_year = avio_rl16(pb);
223  time.tm_wday = avio_rl16(pb);
224  time.tm_yday = avio_rl16(pb);
225  time.tm_isdst = avio_rl16(pb);
226  avio_skip(pb, 2);
227  if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
228  av_dict_set(&avctx->metadata, "time", str, 0);
229  size -= 20;
230  } else if (type == MKTAG('E','X','P','O') && size >= 16) {
231  av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
232  read_uint32(avctx, pb, "isoValue", "%"PRIi32);
233  read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
234  read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
235  size -= 16;
236  if (size >= 8) {
237  read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
238  size -= 8;
239  }
240  } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
241  read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
242  read_uint32(avctx, pb, "contrast", "%"PRIi32);
243  read_uint32(avctx, pb, "sharpness", "%"PRIi32);
244  read_uint32(avctx, pb, "saturation", "%"PRIi32);
245  read_uint32(avctx, pb, "colortone", "%"PRIi32);
246  read_string(avctx, pb, "picStyleName", 16);
247  size -= 36;
248  } else if (type == MKTAG('M','A','R','K')) {
249  } else if (type == MKTAG('N','U','L','L')) {
250  } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
251  } else {
252  av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
253  av_fourcc2str(type), size);
254  }
255  avio_skip(pb, size);
256  }
257  return 0;
258 }
259 
260 static int read_header(AVFormatContext *avctx)
261 {
262  MlvContext *mlv = avctx->priv_data;
263  AVIOContext *pb = avctx->pb;
264  AVStream *vst = NULL, *ast = NULL;
265  FFStream *vsti = NULL, *asti = NULL;
266  int size, ret;
267  unsigned nb_video_frames, nb_audio_frames;
268  uint64_t guid;
269  char guidstr[32];
270 
271  avio_skip(pb, 4);
272  size = avio_rl32(pb);
273  if (size < 52)
274  return AVERROR_INVALIDDATA;
275 
276  avio_skip(pb, 8);
277 
278  guid = avio_rl64(pb);
279  snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
280  av_dict_set(&avctx->metadata, "guid", guidstr, 0);
281 
282  avio_skip(pb, 8); //fileNum, fileCount, fileFlags
283 
284  mlv->class[0] = avio_rl16(pb);
285  mlv->class[1] = avio_rl16(pb);
286 
287  nb_video_frames = avio_rl32(pb);
288  nb_audio_frames = avio_rl32(pb);
289 
290  if (nb_video_frames && mlv->class[0]) {
291  vst = avformat_new_stream(avctx, NULL);
292  if (!vst)
293  return AVERROR(ENOMEM);
294  vsti = ffstream(vst);
295 
296  vst->id = 0;
297  vst->nb_frames = nb_video_frames;
298  if ((mlv->class[0] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)))
299  avpriv_request_sample(avctx, "compression");
300  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
301  switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
302  case MLV_VIDEO_CLASS_RAW:
303  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
304  break;
305  case MLV_VIDEO_CLASS_YUV:
306  vst->codecpar->format = AV_PIX_FMT_YUV420P;
307  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
308  vst->codecpar->codec_tag = 0;
309  break;
310  case MLV_VIDEO_CLASS_JPEG:
311  vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
312  vst->codecpar->codec_tag = 0;
313  break;
314  case MLV_VIDEO_CLASS_H264:
315  vst->codecpar->codec_id = AV_CODEC_ID_H264;
316  vst->codecpar->codec_tag = 0;
317  break;
318  default:
319  avpriv_request_sample(avctx, "unknown video class");
320  }
321  }
322 
323  if (nb_audio_frames && mlv->class[1]) {
324  ast = avformat_new_stream(avctx, NULL);
325  if (!ast)
326  return AVERROR(ENOMEM);
327  asti = ffstream(ast);
328  ast->id = 1;
329  ast->nb_frames = nb_audio_frames;
330  if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
331  avpriv_request_sample(avctx, "compression");
332  if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
333  avpriv_request_sample(avctx, "unknown audio class");
334 
335  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
336  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
337  }
338 
339  if (vst) {
340  AVRational framerate;
341  framerate.num = avio_rl32(pb);
342  framerate.den = avio_rl32(pb);
343  avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
344  } else
345  avio_skip(pb, 8);
346 
347  avio_skip(pb, size - 52);
348 
349  /* scan primary file */
350  mlv->pb[100] = avctx->pb;
351  ret = scan_file(avctx, vst, ast, 100);
352  if (ret < 0)
353  return ret;
354 
355  /* scan secondary files */
356  if (strlen(avctx->url) > 2) {
357  int i;
358  char *filename = av_strdup(avctx->url);
359 
360  if (!filename)
361  return AVERROR(ENOMEM);
362 
363  for (i = 0; i < 100; i++) {
364  snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
365  if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
366  break;
367  if (check_file_header(mlv->pb[i], guid) < 0) {
368  av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
369  ff_format_io_close(avctx, &mlv->pb[i]);
370  continue;
371  }
372  av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
373  ret = scan_file(avctx, vst, ast, i);
374  if (ret < 0) {
375  av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
376  ff_format_io_close(avctx, &mlv->pb[i]);
377  continue;
378  }
379  }
380  av_free(filename);
381  }
382 
383  if (vst)
384  vst->duration = vsti->nb_index_entries;
385  if (ast)
386  ast->duration = asti->nb_index_entries;
387 
388  if ((vst && !vsti->nb_index_entries) || (ast && !asti->nb_index_entries)) {
389  av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
390  return AVERROR_INVALIDDATA;
391  }
392 
393  if (vst && ast)
394  avio_seek(pb, FFMIN(vsti->index_entries[0].pos, asti->index_entries[0].pos), SEEK_SET);
395  else if (vst)
396  avio_seek(pb, vsti->index_entries[0].pos, SEEK_SET);
397  else if (ast)
398  avio_seek(pb, asti->index_entries[0].pos, SEEK_SET);
399 
400  return 0;
401 }
402 
403 static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
404 {
405  MlvContext *mlv = avctx->priv_data;
406  AVIOContext *pb;
407  AVStream *st;
408  FFStream *sti;
409  int index, ret;
410  unsigned int size, space;
411 
412  if (!avctx->nb_streams)
413  return AVERROR_EOF;
414 
415  st = avctx->streams[mlv->stream_index];
416  sti = ffstream(st);
417  if (mlv->pts >= st->duration)
418  return AVERROR_EOF;
419 
420  index = av_index_search_timestamp(st, mlv->pts, AVSEEK_FLAG_ANY);
421  if (index < 0) {
422  av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
423  return AVERROR(EIO);
424  }
425 
426  pb = mlv->pb[sti->index_entries[index].size];
427  if (!pb) {
428  ret = FFERROR_REDO;
429  goto next_packet;
430  }
431  avio_seek(pb, sti->index_entries[index].pos, SEEK_SET);
432 
433  avio_skip(pb, 4); // blockType
434  size = avio_rl32(pb);
435  if (size < 16)
436  return AVERROR_INVALIDDATA;
437  avio_skip(pb, 12); //timestamp, frameNumber
438  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
439  avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
440  space = avio_rl32(pb);
441  avio_skip(pb, space);
442 
443  if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
444  ret = AVERROR_PATCHWELCOME;
445  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
446  ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
447  } else { // AVMEDIA_TYPE_AUDIO
448  if (space > UINT_MAX - 24 || size < (24 + space))
449  return AVERROR_INVALIDDATA;
450  ret = av_get_packet(pb, pkt, size - (24 + space));
451  }
452 
453  if (ret < 0)
454  return ret;
455 
456  pkt->stream_index = mlv->stream_index;
457  pkt->pts = mlv->pts;
458 
459  ret = 0;
460 next_packet:
461  mlv->stream_index++;
462  if (mlv->stream_index == avctx->nb_streams) {
463  mlv->stream_index = 0;
464  mlv->pts++;
465  }
466  return ret;
467 }
468 
469 static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
470 {
471  MlvContext *mlv = avctx->priv_data;
472 
473  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
474  return AVERROR(ENOSYS);
475 
476  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
477  return AVERROR(EIO);
478 
479  mlv->pts = timestamp;
480  return 0;
481 }
482 
483 static int read_close(AVFormatContext *s)
484 {
485  MlvContext *mlv = s->priv_data;
486  int i;
487  for (i = 0; i < 100; i++)
488  ff_format_io_close(s, &mlv->pb[i]);
489  return 0;
490 }
491 
492 const FFInputFormat ff_mlv_demuxer = {
493  .p.name = "mlv",
494  .p.long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
495  .priv_data_size = sizeof(MlvContext),
496  .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
497  .read_probe = probe,
498  .read_header = read_header,
499  .read_packet = read_packet,
500  .read_close = read_close,
501  .read_seek = read_seek,
502 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:215
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:40
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:45
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2501
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
int64_t
long long int64_t
Definition: coverity.c:34
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:65
MlvContext::stream_index
int stream_index
Definition: mlvdec.c:53
read_uint64
static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:115
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1368
read_string
static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
Definition: mlvdec.c:82
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2499
ff_mlv_demuxer
const FFInputFormat ff_mlv_demuxer
Definition: mlvdec.c:492
read_uint32
static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:110
ff_get_wav_header
int ff_get_wav_header(void *logctx, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:95
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:120
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:610
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
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:867
MlvContext
Definition: mlvdec.c:50
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:358
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2500
FFStream::index_entries_allocated_size
unsigned int index_entries_allocated_size
Definition: internal.h:191
AVIOContext::pos
int64_t pos
position in the file of the current buffer
Definition: avio.h:237
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
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:644
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:807
read_header
static int read_header(AVFormatContext *avctx)
Definition: mlvdec.c:260
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:714
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:469
pkt
AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:209
AVFormatContext::metadata
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1535
read_uint16
static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:105
MLV_VERSION
#define MLV_VERSION
Definition: mlvdec.c:38
read_uint8
static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:100
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
MlvContext::pb
AVIOContext * pb[101]
Definition: mlvdec.c:51
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:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
AVIndexEntry::size
int size
Definition: avformat.h:613
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
FF_INFMT_FLAG_INIT_CLEANUP
#define FF_INFMT_FLAG_INIT_CLEANUP
For an FFInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: demux.h:35
AVFormatContext
Format I/O context.
Definition: avformat.h:1300
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:771
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:483
MLV_VIDEO_CLASS_JPEG
#define MLV_VIDEO_CLASS_JPEG
Definition: mlvdec.c:42
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1342
read_packet
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mlvdec.c:403
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:190
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
time.h
index
int index
Definition: gxfenc.c:90
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:809
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1356
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
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:94
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:261
height
#define height
Definition: dsp.h:85
FFStream
Definition: internal.h:132
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:122
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1416
size
int size
Definition: twinvq_data.h:10344
ff_format_io_close
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: avformat.c:958
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:46
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:603
MLV_VIDEO_CLASS_YUV
#define MLV_VIDEO_CLASS_YUV
Definition: mlvdec.c:41
version
version
Definition: libkvazaar.c:321
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:220
FFERROR_REDO
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data).
Definition: demux.h:176
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:66
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:532
AVCodecParameters::height
int height
Definition: codec_par.h:135
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:64
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:91
MLV_VIDEO_CLASS_H264
#define MLV_VIDEO_CLASS_H264
Definition: mlvdec.c:43
tag
uint32_t tag
Definition: movenc.c:1879
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:760
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:748
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
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:612
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:1903
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:603
MLV_CLASS_FLAG_DELTA
#define MLV_CLASS_FLAG_DELTA
Definition: mlvdec.c:47
AVPacket::stream_index
int stream_index
Definition: packet.h:541
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:188
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:167
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:617
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:272
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
mem.h
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVCodecParameters::format
int format
Definition: codec_par.h:92
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:516
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
FFInputFormat
Definition: demux.h:42
avio_rl64
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:738
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:482
MLV_CLASS_FLAG_LZMA
#define MLV_CLASS_FLAG_LZMA
Definition: mlvdec.c:48
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:57
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
width
#define width
Definition: dsp.h:85
snprintf
#define snprintf
Definition: snprintf.h:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1328
MlvContext::class
int class[2]
Definition: mlvdec.c:52
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: seek.c:245
MlvContext::pts
uint64_t pts
Definition: mlvdec.c:54
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346
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