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 read_close(AVFormatContext *s);
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  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);
195  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
196  size -= 4;
197  } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
198  uint64_t pts = avio_rl32(pb);
200  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
201  size -= 4;
202  } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
203  read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
204  read_uint32(avctx, pb, "kelvin", "%"PRIi32);
205  read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
206  read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
207  read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
208  read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
209  read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
210  size -= 28;
211  } else if (type == MKTAG('R','T','C','I') && size >= 20) {
212  char str[32];
213  struct tm time = { 0 };
214  time.tm_sec = avio_rl16(pb);
215  time.tm_min = avio_rl16(pb);
216  time.tm_hour = avio_rl16(pb);
217  time.tm_mday = avio_rl16(pb);
218  time.tm_mon = avio_rl16(pb);
219  time.tm_year = avio_rl16(pb);
220  time.tm_wday = avio_rl16(pb);
221  time.tm_yday = avio_rl16(pb);
222  time.tm_isdst = avio_rl16(pb);
223  avio_skip(pb, 2);
224  if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
225  av_dict_set(&avctx->metadata, "time", str, 0);
226  size -= 20;
227  } else if (type == MKTAG('E','X','P','O') && size >= 16) {
228  av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
229  read_uint32(avctx, pb, "isoValue", "%"PRIi32);
230  read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
231  read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
232  size -= 16;
233  if (size >= 8) {
234  read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
235  size -= 8;
236  }
237  } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
238  read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
239  read_uint32(avctx, pb, "contrast", "%"PRIi32);
240  read_uint32(avctx, pb, "sharpness", "%"PRIi32);
241  read_uint32(avctx, pb, "saturation", "%"PRIi32);
242  read_uint32(avctx, pb, "colortone", "%"PRIi32);
243  read_string(avctx, pb, "picStyleName", 16);
244  size -= 36;
245  } else if (type == MKTAG('M','A','R','K')) {
246  } else if (type == MKTAG('N','U','L','L')) {
247  } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
248  } else {
249  av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
250  av_fourcc2str(type), size);
251  }
252  avio_skip(pb, size);
253  }
254  return 0;
255 }
256 
257 static int read_header(AVFormatContext *avctx)
258 {
259  MlvContext *mlv = avctx->priv_data;
260  AVIOContext *pb = avctx->pb;
261  AVStream *vst = NULL, *ast = NULL;
262  int size, ret;
263  unsigned nb_video_frames, nb_audio_frames;
264  uint64_t guid;
265  char guidstr[32];
266 
267  avio_skip(pb, 4);
268  size = avio_rl32(pb);
269  if (size < 52)
270  return AVERROR_INVALIDDATA;
271 
272  avio_skip(pb, 8);
273 
274  guid = avio_rl64(pb);
275  snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
276  av_dict_set(&avctx->metadata, "guid", guidstr, 0);
277 
278  avio_skip(pb, 8); //fileNum, fileCount, fileFlags
279 
280  mlv->class[0] = avio_rl16(pb);
281  mlv->class[1] = avio_rl16(pb);
282 
283  nb_video_frames = avio_rl32(pb);
284  nb_audio_frames = avio_rl32(pb);
285 
286  if (nb_video_frames && mlv->class[0]) {
287  vst = avformat_new_stream(avctx, NULL);
288  if (!vst)
289  return AVERROR(ENOMEM);
290  vst->id = 0;
291  vst->nb_frames = nb_video_frames;
293  avpriv_request_sample(avctx, "compression");
295  switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
296  case MLV_VIDEO_CLASS_RAW:
298  break;
299  case MLV_VIDEO_CLASS_YUV:
302  vst->codecpar->codec_tag = 0;
303  break;
306  vst->codecpar->codec_tag = 0;
307  break;
310  vst->codecpar->codec_tag = 0;
311  break;
312  default:
313  avpriv_request_sample(avctx, "unknown video class");
314  }
315  }
316 
317  if (nb_audio_frames && mlv->class[1]) {
318  ast = avformat_new_stream(avctx, NULL);
319  if (!ast)
320  return AVERROR(ENOMEM);
321  ast->id = 1;
322  ast->nb_frames = nb_audio_frames;
323  if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
324  avpriv_request_sample(avctx, "compression");
325  if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
326  avpriv_request_sample(avctx, "unknown audio class");
327 
328  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
329  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
330  }
331 
332  if (vst) {
334  framerate.num = avio_rl32(pb);
335  framerate.den = avio_rl32(pb);
336  avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
337  } else
338  avio_skip(pb, 8);
339 
340  avio_skip(pb, size - 52);
341 
342  /* scan primary file */
343  mlv->pb[100] = avctx->pb;
344  ret = scan_file(avctx, vst, ast, 100);
345  if (ret < 0)
346  return ret;
347 
348  /* scan secondary files */
349  if (strlen(avctx->url) > 2) {
350  int i;
351  char *filename = av_strdup(avctx->url);
352 
353  if (!filename)
354  return AVERROR(ENOMEM);
355 
356  for (i = 0; i < 100; i++) {
357  snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
358  if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
359  break;
360  if (check_file_header(mlv->pb[i], guid) < 0) {
361  av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
362  ff_format_io_close(avctx, &mlv->pb[i]);
363  continue;
364  }
365  av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
366  ret = scan_file(avctx, vst, ast, i);
367  if (ret < 0) {
368  av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
369  ff_format_io_close(avctx, &mlv->pb[i]);
370  continue;
371  }
372  }
373  av_free(filename);
374  }
375 
376  if (vst)
377  vst->duration = vst->nb_index_entries;
378  if (ast)
379  ast->duration = ast->nb_index_entries;
380 
381  if ((vst && !vst->nb_index_entries) || (ast && !ast->nb_index_entries)) {
382  av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
383  read_close(avctx);
384  return AVERROR_INVALIDDATA;
385  }
386 
387  if (vst && ast)
388  avio_seek(pb, FFMIN(vst->index_entries[0].pos, ast->index_entries[0].pos), SEEK_SET);
389  else if (vst)
390  avio_seek(pb, vst->index_entries[0].pos, SEEK_SET);
391  else if (ast)
392  avio_seek(pb, ast->index_entries[0].pos, SEEK_SET);
393 
394  return 0;
395 }
396 
398 {
399  MlvContext *mlv = avctx->priv_data;
400  AVIOContext *pb;
401  AVStream *st;
402  int index, ret;
403  unsigned int size, space;
404 
405  if (!avctx->nb_streams)
406  return AVERROR_EOF;
407 
408  st = avctx->streams[mlv->stream_index];
409  if (mlv->pts >= st->duration)
410  return AVERROR_EOF;
411 
412  index = av_index_search_timestamp(st, mlv->pts, AVSEEK_FLAG_ANY);
413  if (index < 0) {
414  av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
415  return AVERROR(EIO);
416  }
417 
418  pb = mlv->pb[st->index_entries[index].size];
419  if (!pb) {
420  ret = FFERROR_REDO;
421  goto next_packet;
422  }
423  avio_seek(pb, st->index_entries[index].pos, SEEK_SET);
424 
425  avio_skip(pb, 4); // blockType
426  size = avio_rl32(pb);
427  if (size < 16)
428  return AVERROR_INVALIDDATA;
429  avio_skip(pb, 12); //timestamp, frameNumber
431  avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
432  space = avio_rl32(pb);
433  avio_skip(pb, space);
434 
435  if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
436  ret = AVERROR_PATCHWELCOME;
437  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
438  ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
439  } else { // AVMEDIA_TYPE_AUDIO
440  if (space > UINT_MAX - 24 || size < (24 + space))
441  return AVERROR_INVALIDDATA;
442  ret = av_get_packet(pb, pkt, size - (24 + space));
443  }
444 
445  if (ret < 0)
446  return ret;
447 
448  pkt->stream_index = mlv->stream_index;
449  pkt->pts = mlv->pts;
450 
451  ret = 0;
452 next_packet:
453  mlv->stream_index++;
454  if (mlv->stream_index == avctx->nb_streams) {
455  mlv->stream_index = 0;
456  mlv->pts++;
457  }
458  return ret;
459 }
460 
461 static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
462 {
463  MlvContext *mlv = avctx->priv_data;
464 
465  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
466  return AVERROR(ENOSYS);
467 
468  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
469  return AVERROR(EIO);
470 
471  mlv->pts = timestamp;
472  return 0;
473 }
474 
476 {
477  MlvContext *mlv = s->priv_data;
478  int i;
479  for (i = 0; i < 100; i++)
480  ff_format_io_close(s, &mlv->pb[i]);
481  return 0;
482 }
483 
485  .name = "mlv",
486  .long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
487  .priv_data_size = sizeof(MlvContext),
488  .read_probe = probe,
492  .read_seek = read_seek,
493 };
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:1933
#define NULL
Definition: coverity.c:32
static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
Definition: mlvdec.c:120
int stream_index
Definition: mlvdec.c:51
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int check_file_header(AVIOContext *pb, uint64_t guid)
Definition: mlvdec.c:66
version
Definition: libkvazaar.c:317
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
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:4869
int64_t pos
Definition: avformat.h:805
#define MLV_CLASS_FLAG_LZMA
Definition: mlvdec.c:46
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2509
static int read_close(AVFormatContext *s)
Definition: mlvdec.c:475
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int num
Numerator.
Definition: rational.h:59
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_FLAG_READ
read-only
Definition: avio.h:674
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1105
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mlvdec.c:397
GLint GLenum type
Definition: opengl_enc.c:104
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
static AVPacket pkt
int framerate
Definition: h264_levels.c:65
#define MLV_CLASS_FLAG_DELTA
Definition: mlvdec.c:45
Format I/O context.
Definition: avformat.h:1351
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: codec_par.h:126
int id
Format-specific stream ID.
Definition: avformat.h:883
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:5616
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4450
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data)...
Definition: internal.h:633
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define height
#define MLV_VIDEO_CLASS_RAW
Definition: mlvdec.c:38
uint32_t tag
Definition: movenc.c:1596
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:305
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:637
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:91
#define AVINDEX_KEYFRAME
Definition: avformat.h:812
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1591
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2100
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
Definition: mlvdec.c:82
#define MLV_VIDEO_CLASS_H264
Definition: mlvdec.c:41
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
char * url
input or output URL.
Definition: avformat.h:1447
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:628
static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mlvdec.c:461
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
#define MLV_VIDEO_CLASS_YUV
Definition: mlvdec.c:39
AVIOContext * pb[101]
Definition: mlvdec.c:49
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
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:317
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
#define FFMIN(a, b)
Definition: common.h:96
AVInputFormat ff_mlv_demuxer
Definition: mlvdec.c:484
#define width
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated space
Definition: undefined.txt:3
#define s(width, name)
Definition: cbs_vp9.c:257
#define MLV_VERSION
Definition: mlvdec.c:36
Stream structure.
Definition: avformat.h:876
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
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:1924
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
static int probe(const AVProbeData *p)
Definition: mlvdec.c:57
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
int nb_index_entries
Definition: avformat.h:1107
static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:110
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2508
#define snprintf
Definition: snprintf.h:34
static int read_header(AVFormatContext *avctx)
Definition: mlvdec.c:257
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:115
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:560
bayer, RGRG..(odd line), GBGB..(even line), 16-bit samples, little-endian
Definition: pixfmt.h:266
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:925
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:743
Main libavformat public API header.
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
Utilties for rational number calculation.
#define MLV_VIDEO_CLASS_JPEG
Definition: mlvdec.c:40
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
int64_t pos
position in the file of the current buffer
Definition: avio.h:238
int class[2]
Definition: mlvdec.c:50
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
int den
Denominator.
Definition: rational.h:60
unsigned int index_entries_allocated_size
Definition: avformat.h:1108
#define av_free(p)
#define MLV_AUDIO_CLASS_WAV
Definition: mlvdec.c:43
void * priv_data
Format private data.
Definition: avformat.h:1379
static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:100
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2510
uint64_t pts
Definition: mlvdec.c:52
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:368
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
int stream_index
Definition: packet.h:365
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
#define MKTAG(a, b, c, d)
Definition: common.h:406
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91
This structure stores compressed data.
Definition: packet.h:340
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:767
static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:105
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:356
int i
Definition: input.c:407
simple arithmetic expression evaluator