FFmpeg: libavformat/rpl.c Source File

FFmpeg
rpl.c
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1 /*
2  * ARMovie/RPL demuxer
3  * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
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 #include <inttypes.h>
23 #include <stdlib.h>
24 
25 #include "libavutil/avstring.h"
26 #include "libavutil/dict.h"
27 #include "avformat.h"
28 #include "internal.h"
29 
30  #define RPL_SIGNATURE "ARMovie\x0A"
31  #define RPL_SIGNATURE_SIZE 8
32 
33 /** 256 is arbitrary, but should be big enough for any reasonable file. */
34  #define RPL_LINE_LENGTH 256
35 
36  static int rpl_probe(const AVProbeData *p)
37 {
38  if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
39  return 0;
40 
41  return AVPROBE_SCORE_MAX;
42 }
43 
44  typedef struct RPLContext {
45  // RPL header data
46   int32_t frames_per_chunk;
47 
48  // Stream position data
49   uint32_t chunk_number;
50   uint32_t chunk_part;
51   uint32_t frame_in_part;
52 } RPLContext;
53 
54  static int read_line(AVIOContext * pb, char* line, int bufsize)
55 {
56  int i;
57  for (i = 0; i < bufsize - 1; i++) {
58  int b = avio_r8(pb);
59  if (b == 0)
60  break;
61  if (b == '\n') {
62  line[i] = '0円';
63  return avio_feof(pb) ? -1 : 0;
64  }
65  line[i] = b;
66  }
67  line[i] = '0円';
68  return -1;
69 }
70 
71  static int32_t read_int(const char* line, const char** endptr, int* error)
72 {
73  unsigned long result = 0;
74  for (; *line>='0' && *line<='9'; line++) {
75  if (result > (0x7FFFFFFF - 9) / 10)
76  *error = -1;
77  result = 10 * result + *line - '0';
78  }
79  *endptr = line;
80  return result;
81 }
82 
83  static int32_t read_line_and_int(AVIOContext * pb, int* error)
84 {
85  char line[RPL_LINE_LENGTH];
86  const char *endptr;
87  *error |= read_line(pb, line, sizeof(line));
88  return read_int(line, &endptr, error);
89 }
90 
91 /** Parsing for fps, which can be a fraction. Unfortunately,
92  * the spec for the header leaves out a lot of details,
93  * so this is mostly guessing.
94  */
95  static AVRational read_fps(const char* line, int* error)
96 {
97  int64_t num, den = 1;
98  AVRational result;
99  num = read_int(line, &line, error);
100  if (*line == '.')
101  line++;
102  for (; *line>='0' && *line<='9'; line++) {
103  // Truncate any numerator too large to fit into an int64_t
104  if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
105  break;
106  num = 10 * num + (*line - '0');
107  den *= 10;
108  }
109  if (!num)
110  *error = -1;
111  av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
112  return result;
113 }
114 
115  static int rpl_read_header(AVFormatContext *s)
116 {
117  AVIOContext *pb = s->pb;
118  RPLContext *rpl = s->priv_data;
119  AVStream *vst = NULL, *ast = NULL;
120  int total_audio_size;
121  int error = 0;
122  const char *endptr;
123  char audio_type[RPL_LINE_LENGTH];
124  char audio_codec[RPL_LINE_LENGTH];
125 
126  uint32_t i;
127 
128  int32_t video_format, audio_format, chunk_catalog_offset, number_of_chunks;
129  AVRational fps;
130 
131  char line[RPL_LINE_LENGTH];
132 
133  // The header for RPL/ARMovie files is 21 lines of text
134  // containing the various header fields. The fields are always
135  // in the same order, and other text besides the first
136  // number usually isn't important.
137  // (The spec says that there exists some significance
138  // for the text in a few cases; samples needed.)
139  error |= read_line(pb, line, sizeof(line)); // ARMovie
140  error |= read_line(pb, line, sizeof(line)); // movie name
141  av_dict_set(&s->metadata, "title" , line, 0);
142  error |= read_line(pb, line, sizeof(line)); // date/copyright
143  av_dict_set(&s->metadata, "copyright", line, 0);
144  error |= read_line(pb, line, sizeof(line)); // author and other
145  av_dict_set(&s->metadata, "author" , line, 0);
146 
147  // video headers
148  video_format = read_line_and_int(pb, &error);
149  if (video_format) {
150  vst = avformat_new_stream(s, NULL);
151  if (!vst)
152  return AVERROR(ENOMEM);
153  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
154  vst->codecpar->codec_tag = video_format;
155  vst->codecpar->width = read_line_and_int(pb, &error); // video width
156  vst->codecpar->height = read_line_and_int(pb, &error); // video height
157  vst->codecpar->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample
158 
159  // Figure out the video codec
160  switch (vst->codecpar->codec_tag) {
161 #if 0
162  case 122:
163  vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE122;
164  break;
165 #endif
166  case 124:
167  vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE124;
168  // The header is wrong here, at least sometimes
169  vst->codecpar->bits_per_coded_sample = 16;
170  break;
171  case 130:
172  vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE130;
173  break;
174  default:
175  avpriv_report_missing_feature(s, "Video format %s",
176  av_fourcc2str(vst->codecpar->codec_tag));
177  vst->codecpar->codec_id = AV_CODEC_ID_NONE;
178  }
179  } else {
180  for (i = 0; i < 3; i++)
181  error |= read_line(pb, line, sizeof(line));
182  }
183 
184  error |= read_line(pb, line, sizeof(line)); // video frames per second
185  fps = read_fps(line, &error);
186  if (vst)
187  avpriv_set_pts_info(vst, 32, fps.den, fps.num);
188 
189  // Audio headers
190 
191  // ARMovie supports multiple audio tracks; I don't have any
192  // samples, though. This code will ignore additional tracks.
193  error |= read_line(pb, line, sizeof(line));
194  audio_format = read_int(line, &endptr, &error); // audio format ID
195  av_strlcpy(audio_codec, endptr, RPL_LINE_LENGTH);
196  if (audio_format) {
197  ast = avformat_new_stream(s, NULL);
198  if (!ast)
199  return AVERROR(ENOMEM);
200  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
201  ast->codecpar->codec_tag = audio_format;
202  ast->codecpar->sample_rate = read_line_and_int(pb, &error); // audio bitrate
203  ast->codecpar->channels = read_line_and_int(pb, &error); // number of audio channels
204  error |= read_line(pb, line, sizeof(line));
205  ast->codecpar->bits_per_coded_sample = read_int(line, &endptr, &error); // audio bits per sample
206  av_strlcpy(audio_type, endptr, RPL_LINE_LENGTH);
207  // At least one sample uses 0 for ADPCM, which is really 4 bits
208  // per sample.
209  if (ast->codecpar->bits_per_coded_sample == 0)
210  ast->codecpar->bits_per_coded_sample = 4;
211 
212  ast->codecpar->bit_rate = ast->codecpar->sample_rate *
213  (int64_t)ast->codecpar->channels;
214  if (ast->codecpar->bit_rate > INT64_MAX / ast->codecpar->bits_per_coded_sample)
215  return AVERROR_INVALIDDATA;
216  ast->codecpar->bit_rate *= ast->codecpar->bits_per_coded_sample;
217 
218  ast->codecpar->codec_id = AV_CODEC_ID_NONE;
219  switch (audio_format) {
220  case 1:
221  if (ast->codecpar->bits_per_coded_sample == 16) {
222  // 16-bit audio is always signed
223  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
224  } else if (ast->codecpar->bits_per_coded_sample == 8) {
225  if (av_stristr(audio_type, "unsigned") != NULL)
226  ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
227  else if (av_stristr(audio_type, "linear") != NULL)
228  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
229  else
230  ast->codecpar->codec_id = AV_CODEC_ID_PCM_VIDC;
231  }
232  // There are some other formats listed as legal per the spec;
233  // samples needed.
234  break;
235  case 2:
236  if (av_stristr(audio_codec, "adpcm") != NULL) {
237  ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_ACORN;
238  }
239  break;
240  case 101:
241  if (ast->codecpar->bits_per_coded_sample == 8) {
242  // The samples with this kind of audio that I have
243  // are all unsigned.
244  ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
245  } else if (ast->codecpar->bits_per_coded_sample == 4) {
246  ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
247  }
248  break;
249  }
250  if (ast->codecpar->codec_id == AV_CODEC_ID_NONE)
251  avpriv_request_sample(s, "Audio format %"PRId32" (%s)",
252  audio_format, audio_codec);
253  avpriv_set_pts_info(ast, 32, 1, ast->codecpar->bit_rate);
254  } else {
255  for (i = 0; i < 3; i++)
256  error |= read_line(pb, line, sizeof(line));
257  }
258 
259  if (s->nb_streams == 0)
260  return AVERROR_INVALIDDATA;
261 
262  rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
263  if (vst && rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124)
264  av_log(s, AV_LOG_WARNING,
265  "Don't know how to split frames for video format %s. "
266  "Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag));
267 
268  number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
269  // The number in the header is actually the index of the last chunk.
270  number_of_chunks++;
271 
272  error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes
273  error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes
274  chunk_catalog_offset = // offset of the "chunk catalog"
275  read_line_and_int(pb, &error); // (file index)
276  error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite
277  error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite
278  if (vst) {
279  error |= read_line(pb, line, sizeof(line)); // offset to key frame list
280  vst->duration = number_of_chunks * rpl->frames_per_chunk;
281  }
282 
283  // Read the index
284  avio_seek(pb, chunk_catalog_offset, SEEK_SET);
285  total_audio_size = 0;
286  for (i = 0; !error && i < number_of_chunks; i++) {
287  int64_t offset, video_size, audio_size;
288  error |= read_line(pb, line, sizeof(line));
289  if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64,
290  &offset, &video_size, &audio_size)) {
291  error = -1;
292  continue;
293  }
294  if (vst)
295  av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
296  video_size, rpl->frames_per_chunk, 0);
297  if (ast)
298  av_add_index_entry(ast, offset + video_size, total_audio_size,
299  audio_size, audio_size * 8, 0);
300  total_audio_size += audio_size * 8;
301  }
302 
303  if (error)
304  return AVERROR(EIO);
305 
306  return 0;
307 }
308 
309  static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
310 {
311  RPLContext *rpl = s->priv_data;
312  AVIOContext *pb = s->pb;
313  AVStream* stream;
314  FFStream *sti;
315  AVIndexEntry* index_entry;
316  int ret;
317 
318  if (rpl->chunk_part == s->nb_streams) {
319  rpl->chunk_number++;
320  rpl->chunk_part = 0;
321  }
322 
323  stream = s->streams[rpl->chunk_part];
324  sti = ffstream(stream);
325 
326  if (rpl->chunk_number >= sti->nb_index_entries)
327  return AVERROR_EOF;
328 
329  index_entry = &sti->index_entries[rpl->chunk_number];
330 
331  if (rpl->frame_in_part == 0) {
332  if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0)
333  return AVERROR(EIO);
334  }
335 
336  if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
337  stream->codecpar->codec_tag == 124) {
338  // We have to split Escape 124 frames because there are
339  // multiple frames per chunk in Escape 124 samples.
340  uint32_t frame_size;
341 
342  avio_skip(pb, 4); /* flags */
343  frame_size = avio_rl32(pb);
344  if (avio_feof(pb) || avio_seek(pb, -8, SEEK_CUR) < 0 || !frame_size)
345  return AVERROR(EIO);
346 
347  ret = av_get_packet(pb, pkt, frame_size);
348  if (ret < 0)
349  return ret;
350  if (ret != frame_size)
351  return AVERROR(EIO);
352 
353  pkt->duration = 1;
354  pkt->pts = index_entry->timestamp + rpl->frame_in_part;
355  pkt->stream_index = rpl->chunk_part;
356 
357  rpl->frame_in_part++;
358  if (rpl->frame_in_part == rpl->frames_per_chunk) {
359  rpl->frame_in_part = 0;
360  rpl->chunk_part++;
361  }
362  } else {
363  ret = av_get_packet(pb, pkt, index_entry->size);
364  if (ret < 0)
365  return ret;
366  if (ret != index_entry->size)
367  return AVERROR(EIO);
368 
369  if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
370  // frames_per_chunk should always be one here; the header
371  // parsing will warn if it isn't.
372  pkt->duration = rpl->frames_per_chunk;
373  } else {
374  // All the audio codecs supported in this container
375  // (at least so far) are constant-bitrate.
376  pkt->duration = ret * 8;
377  }
378  pkt->pts = index_entry->timestamp;
379  pkt->stream_index = rpl->chunk_part;
380  rpl->chunk_part++;
381  }
382 
383  // None of the Escape formats have keyframes, and the ADPCM
384  // format used doesn't have keyframes.
385  if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
386  pkt->flags |= AV_PKT_FLAG_KEY;
387 
388  return ret;
389 }
390 
391  const AVInputFormat ff_rpl_demuxer = {
392  .name = "rpl",
393  .long_name = NULL_IF_CONFIG_SMALL("RPL / ARMovie"),
394  .priv_data_size = sizeof(RPLContext),
395  .read_probe = rpl_probe,
396  .read_header = rpl_read_header,
397  .read_packet = rpl_read_packet,
398 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:31
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:314
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
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:768
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
RPLContext::chunk_number
uint32_t chunk_number
Definition: rpl.c:49
AV_CODEC_ID_ESCAPE130
@ AV_CODEC_ID_ESCAPE130
Definition: codec_id.h:220
RPLContext
Definition: rpl.c:44
av_stristr
char * av_stristr(const char *s1, const char *s2)
Locate the first case-independent occurrence in the string haystack of the string needle.
Definition: avstring.c:56
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
RPL_SIGNATURE_SIZE
#define RPL_SIGNATURE_SIZE
Definition: rpl.c:31
b
#define b
Definition: input.c:40
RPLContext::chunk_part
uint32_t chunk_part
Definition: rpl.c:50
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:428
AVIndexEntry
Definition: avformat.h:801
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:459
RPL_LINE_LENGTH
#define RPL_LINE_LENGTH
256 is arbitrary, but should be big enough for any reasonable file.
Definition: rpl.c:34
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:432
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: seek.c:117
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:985
av_reduce
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
AVRational::num
int num
Numerator.
Definition: rational.h:59
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:318
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:650
read_int
static int32_t read_int(const char *line, const char **endptr, int *error)
Definition: rpl.c:71
AV_CODEC_ID_ADPCM_IMA_ACORN
@ AV_CODEC_ID_ADPCM_IMA_ACORN
Definition: codec_id.h:403
read_line
static int read_line(AVIOContext *pb, char *line, int bufsize)
Definition: rpl.c:54
s
#define s(width, name)
Definition: cbs_vp9.c:257
read_fps
static AVRational read_fps(const char *line, int *error)
Parsing for fps, which can be a fraction.
Definition: rpl.c:95
AV_CODEC_ID_ADPCM_IMA_EA_SEAD
@ AV_CODEC_ID_ADPCM_IMA_EA_SEAD
Definition: codec_id.h:376
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:655
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:449
frame_size
int frame_size
Definition: mxfenc.c:2199
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:812
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:803
if
if(ret)
Definition: filter_design.txt:179
AVFormatContext
Format I/O context.
Definition: avformat.h:1200
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1095
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:279
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:447
rpl_read_header
static int rpl_read_header(AVFormatContext *s)
Definition: rpl.c:115
AV_CODEC_ID_PCM_VIDC
@ AV_CODEC_ID_PCM_VIDC
Definition: codec_id.h:349
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
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:117
FFStream
Definition: internal.h:194
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
RPL_SIGNATURE
#define RPL_SIGNATURE
Definition: rpl.c:30
offset
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 offset
Definition: writing_filters.txt:86
line
Definition: graph2dot.c:48
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
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
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
rpl_probe
static int rpl_probe(const AVProbeData *p)
Definition: rpl.c:36
AVCodecParameters::height
int height
Definition: codec_par.h:127
ff_rpl_demuxer
const AVInputFormat ff_rpl_demuxer
Definition: rpl.c:391
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:197
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:935
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
avformat.h
dict.h
AV_CODEC_ID_ESCAPE124
@ AV_CODEC_ID_ESCAPE124
Definition: codec_id.h:165
read_line_and_int
static int32_t read_line_and_int(AVIOContext *pb, int *error)
Definition: rpl.c:83
AVRational::den
int den
Denominator.
Definition: rational.h:60
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:802
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:1196
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:347
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:277
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
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:319
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
RPLContext::frame_in_part
uint32_t frame_in_part
Definition: rpl.c:51
rpl_read_packet
static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rpl.c:309
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
int32_t
int32_t
Definition: audioconvert.c:56
av_strlcpy
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
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
avstring.h
line
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
Definition: swscale.txt:40
RPLContext::frames_per_chunk
int32_t frames_per_chunk
Definition: rpl.c:46
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375
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