FFmpeg
nuv.c
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1 /*
2  * NuppelVideo demuxer.
3  * Copyright (c) 2006 Reimar Doeffinger
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 
23 #include "libavutil/imgutils.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "riff.h"
29 
30 static const AVCodecTag nuv_audio_tags[] = {
31  { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
32  { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
33  { AV_CODEC_ID_NONE, 0 },
34 };
35 
36 typedef struct NUVContext {
37  int v_id;
38  int a_id;
40 } NUVContext;
41 
42 typedef enum {
43  NUV_VIDEO = 'V',
45  NUV_AUDIO = 'A',
46  NUV_SEEKP = 'R',
49 
50 static int nuv_probe(const AVProbeData *p)
51 {
52  if (!memcmp(p->buf, "NuppelVideo", 12))
53  return AVPROBE_SCORE_MAX;
54  if (!memcmp(p->buf, "MythTVVideo", 12))
55  return AVPROBE_SCORE_MAX;
56  return 0;
57 }
58 
59 /// little macro to sanitize packet size
60 #define PKTSIZE(s) (s & 0xffffff)
61 
62 /**
63  * @brief read until we found all data needed for decoding
64  * @param vst video stream of which to change parameters
65  * @param ast video stream of which to change parameters
66  * @param myth set if this is a MythTVVideo format file
67  * @return 0 or AVERROR code
68  */
70  AVStream *ast, int myth)
71 {
72  nuv_frametype frametype;
73 
74  if (!vst && !myth)
75  return 1; // no codec data needed
76  while (!avio_feof(pb)) {
77  int size, subtype, ret;
78 
79  frametype = avio_r8(pb);
80  switch (frametype) {
81  case NUV_EXTRADATA:
82  subtype = avio_r8(pb);
83  avio_skip(pb, 6);
84  size = PKTSIZE(avio_rl32(pb));
85  if (vst && subtype == 'R') {
86  if ((ret = ff_get_extradata(NULL, vst->codecpar, pb, size)) < 0)
87  return ret;
88  size = 0;
89  if (!myth)
90  return 0;
91  }
92  break;
93  case NUV_MYTHEXT:
94  avio_skip(pb, 7);
95  size = PKTSIZE(avio_rl32(pb));
96  if (size != 128 * 4)
97  break;
98  avio_rl32(pb); // version
99  if (vst) {
100  vst->codecpar->codec_tag = avio_rl32(pb);
101  vst->codecpar->codec_id =
103  if (vst->codecpar->codec_tag == MKTAG('R', 'J', 'P', 'G'))
105  } else
106  avio_skip(pb, 4);
107 
108  if (ast) {
109  int id;
110 
111  ast->codecpar->codec_tag = avio_rl32(pb);
112  ast->codecpar->sample_rate = avio_rl32(pb);
113  if (ast->codecpar->sample_rate <= 0) {
114  av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
115  return AVERROR_INVALIDDATA;
116  }
118  ast->codecpar->channels = avio_rl32(pb);
119  ast->codecpar->channel_layout = 0;
120  if (ast->codecpar->channels <= 0) {
121  av_log(s, AV_LOG_ERROR, "Invalid channels %d\n", ast->codecpar->channels);
122  return AVERROR_INVALIDDATA;
123  }
124 
127  if (id == AV_CODEC_ID_NONE) {
129  if (id == AV_CODEC_ID_PCM_S16LE)
131  0, 0, ~1);
132  }
133  ast->codecpar->codec_id = id;
134 
136  } else
137  avio_skip(pb, 4 * 4);
138 
139  size -= 6 * 4;
140  avio_skip(pb, size);
141  return 0;
142  case NUV_SEEKP:
143  size = 11;
144  break;
145  default:
146  avio_skip(pb, 7);
147  size = PKTSIZE(avio_rl32(pb));
148  break;
149  }
150  avio_skip(pb, size);
151  }
152 
153  return 0;
154 }
155 
157 {
158  NUVContext *ctx = s->priv_data;
159  AVIOContext *pb = s->pb;
160  char id_string[12];
161  double aspect, fps;
162  int is_mythtv, width, height, v_packs, a_packs, ret;
163  AVStream *vst = NULL, *ast = NULL;
164 
165  avio_read(pb, id_string, 12);
166  is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
167  avio_skip(pb, 5); // version string
168  avio_skip(pb, 3); // padding
169  width = avio_rl32(pb);
170  height = avio_rl32(pb);
171  avio_rl32(pb); // unused, "desiredwidth"
172  avio_rl32(pb); // unused, "desiredheight"
173  avio_r8(pb); // 'P' == progressive, 'I' == interlaced
174  avio_skip(pb, 3); // padding
175  aspect = av_int2double(avio_rl64(pb));
176  if (aspect > 0.9999 && aspect < 1.0001)
177  aspect = 4.0 / 3.0;
178  fps = av_int2double(avio_rl64(pb));
179  if (fps < 0.0f) {
180  if (s->error_recognition & AV_EF_EXPLODE) {
181  av_log(s, AV_LOG_ERROR, "Invalid frame rate %f\n", fps);
182  return AVERROR_INVALIDDATA;
183  } else {
184  av_log(s, AV_LOG_WARNING, "Invalid frame rate %f, setting to 0.\n", fps);
185  fps = 0.0f;
186  }
187  }
188 
189  // number of packets per stream type, -1 means unknown, e.g. streaming
190  v_packs = avio_rl32(pb);
191  a_packs = avio_rl32(pb);
192  avio_rl32(pb); // text
193 
194  avio_rl32(pb); // keyframe distance (?)
195 
196  if (v_packs) {
197  vst = avformat_new_stream(s, NULL);
198  if (!vst)
199  return AVERROR(ENOMEM);
200  ctx->v_id = vst->index;
201 
203  if (ret < 0)
204  return ret;
205 
208  vst->codecpar->width = width;
209  vst->codecpar->height = height;
210  vst->codecpar->bits_per_coded_sample = 10;
211  vst->sample_aspect_ratio = av_d2q(aspect * height / width,
212  10000);
213 #if FF_API_R_FRAME_RATE
214  vst->r_frame_rate =
215 #endif
216  vst->avg_frame_rate = av_d2q(fps, 60000);
217  avpriv_set_pts_info(vst, 32, 1, 1000);
218  } else
219  ctx->v_id = -1;
220 
221  if (a_packs) {
222  ast = avformat_new_stream(s, NULL);
223  if (!ast)
224  return AVERROR(ENOMEM);
225  ctx->a_id = ast->index;
226 
227  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
228  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
229  ast->codecpar->channels = 2;
230  ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
231  ast->codecpar->sample_rate = 44100;
232  ast->codecpar->bit_rate = 2 * 2 * 44100 * 8;
233  ast->codecpar->block_align = 2 * 2;
234  ast->codecpar->bits_per_coded_sample = 16;
235  avpriv_set_pts_info(ast, 32, 1, 1000);
236  } else
237  ctx->a_id = -1;
238 
239  if ((ret = get_codec_data(s, pb, vst, ast, is_mythtv)) < 0)
240  return ret;
241 
242  ctx->rtjpg_video = vst && vst->codecpar->codec_id == AV_CODEC_ID_NUV;
243 
244  return 0;
245 }
246 
247 #define HDRSIZE 12
248 
250 {
251  NUVContext *ctx = s->priv_data;
252  AVIOContext *pb = s->pb;
253  uint8_t hdr[HDRSIZE];
254  nuv_frametype frametype;
255  int ret, size;
256 
257  while (!avio_feof(pb)) {
258  int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
259  uint64_t pos = avio_tell(pb);
260 
261  ret = avio_read(pb, hdr, HDRSIZE);
262  if (ret < HDRSIZE)
263  return ret < 0 ? ret : AVERROR(EIO);
264 
265  frametype = hdr[0];
266  size = PKTSIZE(AV_RL32(&hdr[8]));
267 
268  switch (frametype) {
269  case NUV_EXTRADATA:
270  if (!ctx->rtjpg_video) {
271  avio_skip(pb, size);
272  break;
273  }
274  case NUV_VIDEO:
275  if (ctx->v_id < 0) {
276  av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
277  avio_skip(pb, size);
278  break;
279  }
280  ret = av_new_packet(pkt, copyhdrsize + size);
281  if (ret < 0)
282  return ret;
283 
284  pkt->pos = pos;
285  pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
286  pkt->pts = AV_RL32(&hdr[4]);
287  pkt->stream_index = ctx->v_id;
288  memcpy(pkt->data, hdr, copyhdrsize);
289  ret = avio_read(pb, pkt->data + copyhdrsize, size);
290  if (ret < 0) {
291  return ret;
292  }
293  if (ret < size)
294  av_shrink_packet(pkt, copyhdrsize + ret);
295  return 0;
296  case NUV_AUDIO:
297  if (ctx->a_id < 0) {
298  av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
299  avio_skip(pb, size);
300  break;
301  }
302  ret = av_get_packet(pb, pkt, size);
304  pkt->pos = pos;
305  pkt->pts = AV_RL32(&hdr[4]);
306  pkt->stream_index = ctx->a_id;
307  if (ret < 0)
308  return ret;
309  return 0;
310  case NUV_SEEKP:
311  // contains no data, size value is invalid
312  break;
313  default:
314  avio_skip(pb, size);
315  break;
316  }
317  }
318 
319  return AVERROR(EIO);
320 }
321 
322 /**
323  * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
324  * \return 1 if the syncword is found 0 otherwise.
325  */
326 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
327  AVIOContext *pb = s->pb;
328  uint32_t tag = 0;
329  while(!avio_feof(pb) && avio_tell(pb) < pos_limit) {
330  tag = (tag << 8) | avio_r8(pb);
331  if (tag == MKBETAG('R','T','j','j') &&
332  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
333  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
334  return 1;
335  }
336  return 0;
337 }
338 
339 /**
340  * \brief attempts to read a timestamp from stream at the given stream position
341  * \return timestamp if successful and AV_NOPTS_VALUE if failure
342  */
343 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
344  int64_t *ppos, int64_t pos_limit)
345 {
346  NUVContext *ctx = s->priv_data;
347  AVIOContext *pb = s->pb;
348  uint8_t hdr[HDRSIZE];
349  nuv_frametype frametype;
350  int size, key, idx;
351  int64_t pos, dts;
352 
353  if (avio_seek(pb, *ppos, SEEK_SET) < 0)
354  return AV_NOPTS_VALUE;
355 
356  if (!nuv_resync(s, pos_limit))
357  return AV_NOPTS_VALUE;
358 
359  while (!avio_feof(pb) && avio_tell(pb) < pos_limit) {
360  if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
361  return AV_NOPTS_VALUE;
362  frametype = hdr[0];
363  size = PKTSIZE(AV_RL32(&hdr[8]));
364  switch (frametype) {
365  case NUV_SEEKP:
366  break;
367  case NUV_AUDIO:
368  case NUV_VIDEO:
369  if (frametype == NUV_VIDEO) {
370  idx = ctx->v_id;
371  key = hdr[2] == 0;
372  } else {
373  idx = ctx->a_id;
374  key = 1;
375  }
376  if (stream_index == idx) {
377 
378  pos = avio_tell(s->pb) - HDRSIZE;
379  dts = AV_RL32(&hdr[4]);
380 
381  // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
382  av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
383  key ? AVINDEX_KEYFRAME : 0);
384 
385  *ppos = pos;
386  return dts;
387  }
388  default:
389  avio_skip(pb, size);
390  break;
391  }
392  }
393  return AV_NOPTS_VALUE;
394 }
395 
396 
398  .name = "nuv",
399  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
400  .priv_data_size = sizeof(NUVContext),
404  .read_timestamp = nuv_read_dts,
406 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:313
NUV_EXTRADATA
@ NUV_EXTRADATA
Definition: nuv.c:44
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
ff_get_pcm_codec_id
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
Select a PCM codec based on the given parameters.
Definition: utils.c:3094
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
ff_get_extradata
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:3283
av_int2double
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
nuv_frametype
nuv_frametype
Definition: nuv.c:42
nuv_read_dts
static int64_t nuv_read_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
attempts to read a timestamp from stream at the given stream position
Definition: nuv.c:343
ff_wav_codec_get_id
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:191
AVPacket::data
uint8_t * data
Definition: packet.h:373
AVStream::internal
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1009
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:914
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
nuv_audio_tags
static const AVCodecTag nuv_audio_tags[]
Definition: nuv.c:30
intfloat.h
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:785
NUVContext
Definition: nuv.c:36
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
av_shrink_packet
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:114
av_add_index_entry
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1941
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:538
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:423
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
ff_nuv_demuxer
const AVInputFormat ff_nuv_demuxer
Definition: nuv.c:397
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:764
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
AVInputFormat
Definition: avformat.h:626
AVCodecTag
Definition: internal.h:50
width
#define width
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
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
AV_CODEC_ID_NUV
@ AV_CODEC_ID_NUV
Definition: codec_id.h:134
ctx
AVFormatContext * ctx
Definition: movenc.c:48
key
const char * key
Definition: hwcontext_opencl.c:168
NUV_MYTHEXT
@ NUV_MYTHEXT
Definition: nuv.c:47
f
#define f(width, name)
Definition: cbs_vp9.c:255
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
nuv_packet
static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nuv.c:249
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
get_codec_data
static int get_codec_data(AVFormatContext *s, AVIOContext *pb, AVStream *vst, AVStream *ast, int myth)
read until we found all data needed for decoding
Definition: nuv.c:69
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1331
PKTSIZE
#define PKTSIZE(s)
little macro to sanitize packet size
Definition: nuv.c:60
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
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
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:325
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3082
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
size
int size
Definition: twinvq_data.h:10344
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
NUV_AUDIO
@ NUV_AUDIO
Definition: nuv.c:45
NUVContext::rtjpg_video
int rtjpg_video
Definition: nuv.c:39
NUVContext::v_id
int v_id
Definition: nuv.c:37
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:903
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:607
height
#define height
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
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
AVCodecParameters::height
int height
Definition: codec_par.h:127
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
NUVContext::a_id
int a_id
Definition: nuv.c:38
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
NUV_SEEKP
@ NUV_SEEKP
Definition: nuv.c:46
tag
uint32_t tag
Definition: movenc.c:1594
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
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
AVStreamInternal::need_parsing
enum AVStreamParseType need_parsing
Definition: internal.h:384
NUV_VIDEO
@ NUV_VIDEO
Definition: nuv.c:43
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
nuv_header
static int nuv_header(AVFormatContext *s)
Definition: nuv.c:156
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:848
ff_codec_bmp_tags
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:34
channel_layout.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
AVStream::r_frame_rate
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:983
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
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
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
HDRSIZE
#define HDRSIZE
Definition: nuv.c:247
AVPacket
This structure stores compressed data.
Definition: packet.h:350
riff.h
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:393
avio_rl64
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:741
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
AVSTREAM_PARSE_FULL
@ AVSTREAM_PARSE_FULL
full parsing and repack
Definition: avformat.h:768
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
nuv_resync
static int nuv_resync(AVFormatContext *s, int64_t pos_limit)
looks for the string RTjjjjjjjjjj in the stream too resync reading
Definition: nuv.c:326
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
nuv_probe
static int nuv_probe(const AVProbeData *p)
Definition: nuv.c:50
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
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:354