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 "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];
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;
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  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
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);
193  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
194  size -= 4;
195  } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
196  uint64_t pts = avio_rl32(pb);
198  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
199  size -= 4;
200  } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
201  read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
202  read_uint32(avctx, pb, "kelvin", "%"PRIi32);
203  read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
204  read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
205  read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
206  read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
207  read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
208  size -= 28;
209  } else if (type == MKTAG('R','T','C','I') && size >= 20) {
210  char str[32];
211  struct tm time = { 0 };
212  time.tm_sec = avio_rl16(pb);
213  time.tm_min = avio_rl16(pb);
214  time.tm_hour = avio_rl16(pb);
215  time.tm_mday = avio_rl16(pb);
216  time.tm_mon = avio_rl16(pb);
217  time.tm_year = avio_rl16(pb);
218  time.tm_wday = avio_rl16(pb);
219  time.tm_yday = avio_rl16(pb);
220  time.tm_isdst = avio_rl16(pb);
221  avio_skip(pb, 2);
222  if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
223  av_dict_set(&avctx->metadata, "time", str, 0);
224  size -= 20;
225  } else if (type == MKTAG('E','X','P','O') && size >= 16) {
226  av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
227  read_uint32(avctx, pb, "isoValue", "%"PRIi32);
228  read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
229  read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
230  size -= 16;
231  if (size >= 8) {
232  read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
233  size -= 8;
234  }
235  } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
236  read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
237  read_uint32(avctx, pb, "contrast", "%"PRIi32);
238  read_uint32(avctx, pb, "sharpness", "%"PRIi32);
239  read_uint32(avctx, pb, "saturation", "%"PRIi32);
240  read_uint32(avctx, pb, "colortone", "%"PRIi32);
241  read_string(avctx, pb, "picStyleName", 16);
242  size -= 36;
243  } else if (type == MKTAG('M','A','R','K')) {
244  } else if (type == MKTAG('N','U','L','L')) {
245  } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
246  } else {
247  av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
249  }
250  avio_skip(pb, size);
251  }
252  return 0;
253 }
254 
255 static int read_header(AVFormatContext *avctx)
256 {
257  MlvContext *mlv = avctx->priv_data;
258  AVIOContext *pb = avctx->pb;
259  AVStream *vst = NULL, *ast = NULL;
260  int size, ret;
261  unsigned nb_video_frames, nb_audio_frames;
262  uint64_t guid;
263  char guidstr[32];
264 
265  avio_skip(pb, 4);
266  size = avio_rl32(pb);
267  if (size < 52)
268  return AVERROR_INVALIDDATA;
269 
270  avio_skip(pb, 8);
271 
272  guid = avio_rl64(pb);
273  snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
274  av_dict_set(&avctx->metadata, "guid", guidstr, 0);
275 
276  avio_skip(pb, 8); //fileNum, fileCount, fileFlags
277 
278  mlv->class[0] = avio_rl16(pb);
279  mlv->class[1] = avio_rl16(pb);
280 
281  nb_video_frames = avio_rl32(pb);
282  nb_audio_frames = avio_rl32(pb);
283 
284  if (nb_video_frames && mlv->class[0]) {
285  vst = avformat_new_stream(avctx, NULL);
286  if (!vst)
287  return AVERROR(ENOMEM);
288  vst->id = 0;
289  vst->nb_frames = nb_video_frames;
291  avpriv_request_sample(avctx, "compression");
293  switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
294  case MLV_VIDEO_CLASS_RAW:
296  break;
297  case MLV_VIDEO_CLASS_YUV:
300  vst->codecpar->codec_tag = 0;
301  break;
304  vst->codecpar->codec_tag = 0;
305  break;
308  vst->codecpar->codec_tag = 0;
309  break;
310  default:
311  avpriv_request_sample(avctx, "unknown video class");
312  }
313  }
314 
315  if (nb_audio_frames && mlv->class[1]) {
316  ast = avformat_new_stream(avctx, NULL);
317  if (!ast)
318  return AVERROR(ENOMEM);
319  ast->id = 1;
320  ast->nb_frames = nb_audio_frames;
321  if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
322  avpriv_request_sample(avctx, "compression");
323  if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
324  avpriv_request_sample(avctx, "unknown audio class");
325 
326  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
327  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
328  }
329 
330  if (vst) {
332  framerate.num = avio_rl32(pb);
333  framerate.den = avio_rl32(pb);
334  avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
335  } else
336  avio_skip(pb, 8);
337 
338  avio_skip(pb, size - 52);
339 
340  /* scan primary file */
341  mlv->pb[100] = avctx->pb;
342  ret = scan_file(avctx, vst, ast, 100);
343  if (ret < 0)
344  return ret;
345 
346  /* scan secondary files */
347  if (strlen(avctx->url) > 2) {
348  int i;
349  char *filename = av_strdup(avctx->url);
350 
351  if (!filename)
352  return AVERROR(ENOMEM);
353 
354  for (i = 0; i < 100; i++) {
355  snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
356  if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
357  break;
358  if (check_file_header(mlv->pb[i], guid) < 0) {
359  av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
360  ff_format_io_close(avctx, &mlv->pb[i]);
361  continue;
362  }
363  av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
364  ret = scan_file(avctx, vst, ast, i);
365  if (ret < 0) {
366  av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
367  ff_format_io_close(avctx, &mlv->pb[i]);
368  continue;
369  }
370  }
371  av_free(filename);
372  }
373 
374  if (vst)
375  vst->duration = vst->internal->nb_index_entries;
376  if (ast)
377  ast->duration = ast->internal->nb_index_entries;
378 
379  if ((vst && !vst->internal->nb_index_entries) || (ast && !ast->internal->nb_index_entries)) {
380  av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
381  return AVERROR_INVALIDDATA;
382  }
383 
384  if (vst && ast)
385  avio_seek(pb, FFMIN(vst->internal->index_entries[0].pos, ast->internal->index_entries[0].pos), SEEK_SET);
386  else if (vst)
387  avio_seek(pb, vst->internal->index_entries[0].pos, SEEK_SET);
388  else if (ast)
389  avio_seek(pb, ast->internal->index_entries[0].pos, SEEK_SET);
390 
391  return 0;
392 }
393 
395 {
396  MlvContext *mlv = avctx->priv_data;
397  AVIOContext *pb;
398  AVStream *st;
399  int index, ret;
400  unsigned int size, space;
401 
402  if (!avctx->nb_streams)
403  return AVERROR_EOF;
404 
405  st = avctx->streams[mlv->stream_index];
406  if (mlv->pts >= st->duration)
407  return AVERROR_EOF;
408 
410  if (index < 0) {
411  av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
412  return AVERROR(EIO);
413  }
414 
415  pb = mlv->pb[st->internal->index_entries[index].size];
416  if (!pb) {
417  ret = FFERROR_REDO;
418  goto next_packet;
419  }
420  avio_seek(pb, st->internal->index_entries[index].pos, SEEK_SET);
421 
422  avio_skip(pb, 4); // blockType
423  size = avio_rl32(pb);
424  if (size < 16)
425  return AVERROR_INVALIDDATA;
426  avio_skip(pb, 12); //timestamp, frameNumber
428  avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
429  space = avio_rl32(pb);
430  avio_skip(pb, space);
431 
432  if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
434  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
435  ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
436  } else { // AVMEDIA_TYPE_AUDIO
437  if (space > UINT_MAX - 24 || size < (24 + space))
438  return AVERROR_INVALIDDATA;
439  ret = av_get_packet(pb, pkt, size - (24 + space));
440  }
441 
442  if (ret < 0)
443  return ret;
444 
445  pkt->stream_index = mlv->stream_index;
446  pkt->pts = mlv->pts;
447 
448  ret = 0;
449 next_packet:
450  mlv->stream_index++;
451  if (mlv->stream_index == avctx->nb_streams) {
452  mlv->stream_index = 0;
453  mlv->pts++;
454  }
455  return ret;
456 }
457 
458 static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
459 {
460  MlvContext *mlv = avctx->priv_data;
461 
463  return AVERROR(ENOSYS);
464 
465  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
466  return AVERROR(EIO);
467 
468  mlv->pts = timestamp;
469  return 0;
470 }
471 
473 {
474  MlvContext *mlv = s->priv_data;
475  int i;
476  for (i = 0; i < 100; i++)
477  ff_format_io_close(s, &mlv->pb[i]);
478  return 0;
479 }
480 
482  .name = "mlv",
483  .long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
484  .priv_data_size = sizeof(MlvContext),
485  .flags_internal = FF_FMT_INIT_CLEANUP,
486  .read_probe = probe,
490  .read_seek = read_seek,
491 };
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: utils.c:4375
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: codec_par.h:56
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
FFERROR_REDO
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data).
Definition: internal.h:846
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2170
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:481
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:63
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:1175
index
fg index
Definition: ffmpeg_filter.c:168
AVStream::internal
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1009
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:1882
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:2168
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: codec_par.h:64
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:785
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
framerate
int framerate
Definition: h264_levels.c:65
MlvContext
Definition: mlvdec.c:48
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2169
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:538
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:653
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:890
read_header
static int read_header(AVFormatContext *avctx)
Definition: mlvdec.c:255
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:717
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:458
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:1336
AVInputFormat
Definition: avformat.h:626
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
width
#define width
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:256
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
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: codec_par.h:126
AVIndexEntry::size
int size
Definition: avformat.h:788
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:1107
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
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:472
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:1149
read_packet
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mlvdec.c:394
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:892
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1163
eval.h
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:733
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:116
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
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
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:4800
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1190
size
int size
Definition: twinvq_data.h:10344
AVStreamInternal::nb_index_entries
int nb_index_entries
Definition: internal.h:258
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:607
height
#define height
AVStreamInternal::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:256
MLV_VIDEO_CLASS_YUV
#define MLV_VIDEO_CLASS_YUV
Definition: mlvdec.c:39
version
version
Definition: libkvazaar.c:307
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
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:64
i
int i
Definition: input.c:406
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
avio_internal.h
AVStreamInternal::index_entries_allocated_size
unsigned int index_entries_allocated_size
Definition: internal.h:259
AVCodecParameters::height
int height
Definition: codec_par.h:127
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
ff_get_wav_header
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:90
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:282
MLV_VIDEO_CLASS_H264
#define MLV_VIDEO_CLASS_H264
Definition: mlvdec.c:41
tag
uint32_t tag
Definition: movenc.c:1594
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:854
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:847
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:243
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:40
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
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:1672
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:778
MLV_CLASS_FLAG_DELTA
#define MLV_CLASS_FLAG_DELTA
Definition: mlvdec.c:45
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:327
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:5453
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:655
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:259
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:102
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
AVCodecParameters::format
int format
Definition: codec_par.h:84
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: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
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:741
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: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:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
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:318
snprintf
#define snprintf
Definition: snprintf.h:34
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1135
MlvContext::class
int class[2]
Definition: mlvdec.c:50
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:2058
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:354