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;
95  av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
96 }
97 
98 static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
99 {
100  av_dict_set_int(&avctx->metadata, tag, avio_r8(pb), 0);
101 }
102 
103 static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
104 {
105  av_dict_set_int(&avctx->metadata, tag, avio_rl16(pb), 0);
106 }
107 
108 static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
109 {
110  av_dict_set_int(&avctx->metadata, tag, avio_rl32(pb), 0);
111 }
112 
113 static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
114 {
115  av_dict_set_int(&avctx->metadata, tag, avio_rl64(pb), 0);
116 }
117 
118 static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
119 {
120  MlvContext *mlv = avctx->priv_data;
121  AVIOContext *pb = mlv->pb[file];
122  int ret;
123  while (!avio_feof(pb)) {
124  int type;
125  unsigned int size;
126  type = avio_rl32(pb);
127  size = avio_rl32(pb);
128  avio_skip(pb, 8); //timestamp
129  if (size < 16)
130  break;
131  size -= 16;
132  if (vst && type == MKTAG('R','A','W','I') && size >= 164) {
133  vst->codecpar->width = avio_rl16(pb);
134  vst->codecpar->height = avio_rl16(pb);
135  ret = av_image_check_size(vst->codecpar->width, vst->codecpar->height, 0, avctx);
136  if (ret < 0)
137  return ret;
138  if (avio_rl32(pb) != 1)
139  avpriv_request_sample(avctx, "raw api version");
140  avio_skip(pb, 20); // pointer, width, height, pitch, frame_size
142  if (vst->codecpar->bits_per_coded_sample < 0 ||
143  vst->codecpar->bits_per_coded_sample > (INT_MAX - 7) / (vst->codecpar->width * vst->codecpar->height)) {
144  av_log(avctx, AV_LOG_ERROR,
145  "invalid bits_per_coded_sample %d (size: %dx%d)\n",
147  vst->codecpar->width, vst->codecpar->height);
148  return AVERROR_INVALIDDATA;
149  }
150  avio_skip(pb, 8 + 16 + 24); // black_level, white_level, xywh, active_area, exposure_bias
151  if (avio_rl32(pb) != 0x2010100) /* RGGB */
152  avpriv_request_sample(avctx, "cfa_pattern");
153  avio_skip(pb, 80); // calibration_illuminant1, color_matrix1, dynamic_range
155  vst->codecpar->codec_tag = MKTAG('B', 'I', 'T', 16);
156  size -= 164;
157  } else if (ast && type == MKTAG('W', 'A', 'V', 'I') && size >= 16) {
158  ret = ff_get_wav_header(avctx, pb, ast->codecpar, 16, 0);
159  if (ret < 0)
160  return ret;
161  size -= 16;
162  } else if (type == MKTAG('I','N','F','O')) {
163  if (size > 0)
164  read_string(avctx, pb, "info", size);
165  continue;
166  } else if (type == MKTAG('I','D','N','T') && size >= 36) {
167  read_string(avctx, pb, "cameraName", 32);
168  read_uint32(avctx, pb, "cameraModel", "0x%"PRIx32);
169  size -= 36;
170  if (size >= 32) {
171  read_string(avctx, pb, "cameraSerial", 32);
172  size -= 32;
173  }
174  } else if (type == MKTAG('L','E','N','S') && size >= 48) {
175  read_uint16(avctx, pb, "focalLength", "%i");
176  read_uint16(avctx, pb, "focalDist", "%i");
177  read_uint16(avctx, pb, "aperture", "%i");
178  read_uint8(avctx, pb, "stabilizerMode", "%i");
179  read_uint8(avctx, pb, "autofocusMode", "%i");
180  read_uint32(avctx, pb, "flags", "0x%"PRIx32);
181  read_uint32(avctx, pb, "lensID", "%"PRIi32);
182  read_string(avctx, pb, "lensName", 32);
183  size -= 48;
184  if (size >= 32) {
185  read_string(avctx, pb, "lensSerial", 32);
186  size -= 32;
187  }
188  } else if (vst && type == MKTAG('V', 'I', 'D', 'F') && size >= 4) {
189  uint64_t pts = avio_rl32(pb);
191  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
192  size -= 4;
193  } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
194  uint64_t pts = avio_rl32(pb);
196  avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
197  size -= 4;
198  } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
199  read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
200  read_uint32(avctx, pb, "kelvin", "%"PRIi32);
201  read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
202  read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
203  read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
204  read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
205  read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
206  size -= 28;
207  } else if (type == MKTAG('R','T','C','I') && size >= 20) {
208  char str[32];
209  struct tm time = { 0 };
210  time.tm_sec = avio_rl16(pb);
211  time.tm_min = avio_rl16(pb);
212  time.tm_hour = avio_rl16(pb);
213  time.tm_mday = avio_rl16(pb);
214  time.tm_mon = avio_rl16(pb);
215  time.tm_year = avio_rl16(pb);
216  time.tm_wday = avio_rl16(pb);
217  time.tm_yday = avio_rl16(pb);
218  time.tm_isdst = avio_rl16(pb);
219  avio_skip(pb, 2);
220  if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
221  av_dict_set(&avctx->metadata, "time", str, 0);
222  size -= 20;
223  } else if (type == MKTAG('E','X','P','O') && size >= 16) {
224  av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
225  read_uint32(avctx, pb, "isoValue", "%"PRIi32);
226  read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
227  read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
228  size -= 16;
229  if (size >= 8) {
230  read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
231  size -= 8;
232  }
233  } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
234  read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
235  read_uint32(avctx, pb, "contrast", "%"PRIi32);
236  read_uint32(avctx, pb, "sharpness", "%"PRIi32);
237  read_uint32(avctx, pb, "saturation", "%"PRIi32);
238  read_uint32(avctx, pb, "colortone", "%"PRIi32);
239  read_string(avctx, pb, "picStyleName", 16);
240  size -= 36;
241  } else if (type == MKTAG('M','A','R','K')) {
242  } else if (type == MKTAG('N','U','L','L')) {
243  } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
244  } else {
245  av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
246  av_fourcc2str(type), size);
247  }
248  avio_skip(pb, size);
249  }
250  return 0;
251 }
252 
253 static int read_header(AVFormatContext *avctx)
254 {
255  MlvContext *mlv = avctx->priv_data;
256  AVIOContext *pb = avctx->pb;
257  AVStream *vst = NULL, *ast = NULL;
258  int size, ret;
259  unsigned nb_video_frames, nb_audio_frames;
260  uint64_t guid;
261  char guidstr[32];
262 
263  avio_skip(pb, 4);
264  size = avio_rl32(pb);
265  if (size < 52)
266  return AVERROR_INVALIDDATA;
267 
268  avio_skip(pb, 8);
269 
270  guid = avio_rl64(pb);
271  snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
272  av_dict_set(&avctx->metadata, "guid", guidstr, 0);
273 
274  avio_skip(pb, 8); //fileNum, fileCount, fileFlags
275 
276  mlv->class[0] = avio_rl16(pb);
277  mlv->class[1] = avio_rl16(pb);
278 
279  nb_video_frames = avio_rl32(pb);
280  nb_audio_frames = avio_rl32(pb);
281 
282  if (nb_video_frames && mlv->class[0]) {
283  vst = avformat_new_stream(avctx, NULL);
284  if (!vst)
285  return AVERROR(ENOMEM);
286  vst->id = 0;
287  vst->nb_frames = nb_video_frames;
289  avpriv_request_sample(avctx, "compression");
291  switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
292  case MLV_VIDEO_CLASS_RAW:
294  break;
295  case MLV_VIDEO_CLASS_YUV:
298  vst->codecpar->codec_tag = 0;
299  break;
302  vst->codecpar->codec_tag = 0;
303  break;
306  vst->codecpar->codec_tag = 0;
307  break;
308  default:
309  avpriv_request_sample(avctx, "unknown video class");
310  }
311  }
312 
313  if (nb_audio_frames && mlv->class[1]) {
314  ast = avformat_new_stream(avctx, NULL);
315  if (!ast)
316  return AVERROR(ENOMEM);
317  ast->id = 1;
318  ast->nb_frames = nb_audio_frames;
319  if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
320  avpriv_request_sample(avctx, "compression");
321  if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
322  avpriv_request_sample(avctx, "unknown audio class");
323 
324  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
325  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
326  }
327 
328  if (vst) {
330  framerate.num = avio_rl32(pb);
331  framerate.den = avio_rl32(pb);
332  avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
333  } else
334  avio_skip(pb, 8);
335 
336  avio_skip(pb, size - 52);
337 
338  /* scan primary file */
339  mlv->pb[100] = avctx->pb;
340  ret = scan_file(avctx, vst, ast, 100);
341  if (ret < 0)
342  return ret;
343 
344  /* scan secondary files */
345  if (strlen(avctx->url) > 2) {
346  int i;
347  char *filename = av_strdup(avctx->url);
348 
349  if (!filename)
350  return AVERROR(ENOMEM);
351 
352  for (i = 0; i < 100; i++) {
353  snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
354  if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
355  break;
356  if (check_file_header(mlv->pb[i], guid) < 0) {
357  av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
358  ff_format_io_close(avctx, &mlv->pb[i]);
359  continue;
360  }
361  av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
362  ret = scan_file(avctx, vst, ast, i);
363  if (ret < 0) {
364  av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
365  ff_format_io_close(avctx, &mlv->pb[i]);
366  continue;
367  }
368  }
369  av_free(filename);
370  }
371 
372  if (vst)
373  vst->duration = vst->nb_index_entries;
374  if (ast)
375  ast->duration = ast->nb_index_entries;
376 
377  if ((vst && !vst->nb_index_entries) || (ast && !ast->nb_index_entries)) {
378  av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
379  return AVERROR_INVALIDDATA;
380  }
381 
382  if (vst && ast)
383  avio_seek(pb, FFMIN(vst->index_entries[0].pos, ast->index_entries[0].pos), SEEK_SET);
384  else if (vst)
385  avio_seek(pb, vst->index_entries[0].pos, SEEK_SET);
386  else if (ast)
387  avio_seek(pb, ast->index_entries[0].pos, SEEK_SET);
388 
389  return 0;
390 }
391 
393 {
394  MlvContext *mlv = avctx->priv_data;
395  AVIOContext *pb;
396  AVStream *st = avctx->streams[mlv->stream_index];
397  int index, ret;
398  unsigned int size, space;
399 
400  if (mlv->pts >= st->duration)
401  return AVERROR_EOF;
402 
403  index = av_index_search_timestamp(st, mlv->pts, AVSEEK_FLAG_ANY);
404  if (index < 0) {
405  av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
406  return AVERROR(EIO);
407  }
408 
409  pb = mlv->pb[st->index_entries[index].size];
410  avio_seek(pb, st->index_entries[index].pos, SEEK_SET);
411 
412  avio_skip(pb, 4); // blockType
413  size = avio_rl32(pb);
414  if (size < 16)
415  return AVERROR_INVALIDDATA;
416  avio_skip(pb, 12); //timestamp, frameNumber
418  avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
419  space = avio_rl32(pb);
420  avio_skip(pb, space);
421 
422  if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
423  ret = AVERROR_PATCHWELCOME;
424  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
425  ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
426  } else { // AVMEDIA_TYPE_AUDIO
427  if (space > UINT_MAX - 24 || size < (24 + space))
428  return AVERROR_INVALIDDATA;
429  ret = av_get_packet(pb, pkt, size - (24 + space));
430  }
431 
432  if (ret < 0)
433  return ret;
434 
435  pkt->stream_index = mlv->stream_index;
436  pkt->pts = mlv->pts;
437 
438  mlv->stream_index++;
439  if (mlv->stream_index == avctx->nb_streams) {
440  mlv->stream_index = 0;
441  mlv->pts++;
442  }
443  return 0;
444 }
445 
446 static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
447 {
448  MlvContext *mlv = avctx->priv_data;
449 
450  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
451  return AVERROR(ENOSYS);
452 
453  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
454  return AVERROR(EIO);
455 
456  mlv->pts = timestamp;
457  return 0;
458 }
459 
461 {
462  MlvContext *mlv = s->priv_data;
463  int i;
464  for (i = 0; i < 100; i++)
465  ff_format_io_close(s, &mlv->pb[i]);
466  return 0;
467 }
468 
470  .name = "mlv",
471  .long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
472  .priv_data_size = sizeof(MlvContext),
473  .read_probe = probe,
477  .read_seek = read_seek,
478 };
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:1940
#define NULL
Definition: coverity.c:32
static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
Definition: mlvdec.c:118
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:64
const char * fmt
Definition: avisynth_c.h:861
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:4929
int64_t pos
Definition: avformat.h:810
#define MLV_CLASS_FLAG_LZMA
Definition: mlvdec.c:46
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2520
static int read_close(AVFormatContext *s)
Definition: mlvdec.c:460
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
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:246
#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:1110
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mlvdec.c:392
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:334
int version
Definition: avisynth_c.h:858
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:1358
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4034
int id
Format-specific stream ID.
Definition: avformat.h:888
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: utils.c:5684
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:4502
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
#define MLV_VIDEO_CLASS_RAW
Definition: mlvdec.c:38
uint32_t tag
Definition: movenc.c:1531
#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:310
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:650
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:817
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2164
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
Definition: mlvdec.c:80
#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:186
char * url
input or output URL.
Definition: avformat.h:1454
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:641
static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mlvdec.c:446
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
#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:1414
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:282
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:469
#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:881
#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:187
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:1990
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
static int probe(const AVProbeData *p)
Definition: mlvdec.c:55
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:1112
static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:108
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:2519
#define snprintf
Definition: snprintf.h:34
static int read_header(AVFormatContext *avctx)
Definition: mlvdec.c:253
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:113
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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:930
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
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:932
int den
Denominator.
Definition: rational.h:60
unsigned int index_entries_allocated_size
Definition: avformat.h:1113
#define av_free(p)
#define MLV_AUDIO_CLASS_WAV
Definition: mlvdec.c:43
void * priv_data
Format private data.
Definition: avformat.h:1386
static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:98
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2521
uint64_t pts
Definition: mlvdec.c:52
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
int stream_index
Definition: avcodec.h:1482
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:366
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1457
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:780
static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
Definition: mlvdec.c:103
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
simple arithmetic expression evaluator