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
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';
63  return avio_feof(pb) ? -1 : 0;
64  }
65  line[i] = b;
66  }
67  line[i] = '\0';
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 
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;
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 
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 
125  uint32_t i;
126 
127  int32_t video_format, audio_format, chunk_catalog_offset, number_of_chunks;
128  AVRational fps;
129 
130  char line[RPL_LINE_LENGTH];
131 
132  // The header for RPL/ARMovie files is 21 lines of text
133  // containing the various header fields. The fields are always
134  // in the same order, and other text besides the first
135  // number usually isn't important.
136  // (The spec says that there exists some significance
137  // for the text in a few cases; samples needed.)
138  error |= read_line(pb, line, sizeof(line)); // ARMovie
139  error |= read_line(pb, line, sizeof(line)); // movie name
140  av_dict_set(&s->metadata, "title" , line, 0);
141  error |= read_line(pb, line, sizeof(line)); // date/copyright
142  av_dict_set(&s->metadata, "copyright", line, 0);
143  error |= read_line(pb, line, sizeof(line)); // author and other
144  av_dict_set(&s->metadata, "author" , line, 0);
145 
146  // video headers
147  video_format = read_line_and_int(pb, &error);
148  if (video_format) {
149  vst = avformat_new_stream(s, NULL);
150  if (!vst)
151  return AVERROR(ENOMEM);
153  vst->codecpar->codec_tag = video_format;
154  vst->codecpar->width = read_line_and_int(pb, &error); // video width
155  vst->codecpar->height = read_line_and_int(pb, &error); // video height
156  vst->codecpar->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample
157 
158  // Figure out the video codec
159  switch (vst->codecpar->codec_tag) {
160 #if 0
161  case 122:
162  vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE122;
163  break;
164 #endif
165  case 124:
167  // The header is wrong here, at least sometimes
168  vst->codecpar->bits_per_coded_sample = 16;
169  break;
170  case 130:
172  break;
173  default:
174  avpriv_report_missing_feature(s, "Video format %s",
177  }
178  } else {
179  for (i = 0; i < 3; i++)
180  error |= read_line(pb, line, sizeof(line));
181  }
182 
183  error |= read_line(pb, line, sizeof(line)); // video frames per second
184  fps = read_fps(line, &error);
185  if (vst)
186  avpriv_set_pts_info(vst, 32, fps.den, fps.num);
187 
188  // Audio headers
189 
190  // ARMovie supports multiple audio tracks; I don't have any
191  // samples, though. This code will ignore additional tracks.
192  audio_format = read_line_and_int(pb, &error); // audio format ID
193  if (audio_format) {
194  ast = avformat_new_stream(s, NULL);
195  if (!ast)
196  return AVERROR(ENOMEM);
197  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
198  ast->codecpar->codec_tag = audio_format;
199  ast->codecpar->sample_rate = read_line_and_int(pb, &error); // audio bitrate
200  ast->codecpar->channels = read_line_and_int(pb, &error); // number of audio channels
201  error |= read_line(pb, line, sizeof(line));
202  ast->codecpar->bits_per_coded_sample = read_int(line, &endptr, &error); // audio bits per sample
203  av_strlcpy(audio_type, endptr, RPL_LINE_LENGTH);
204  // At least one sample uses 0 for ADPCM, which is really 4 bits
205  // per sample.
206  if (ast->codecpar->bits_per_coded_sample == 0)
207  ast->codecpar->bits_per_coded_sample = 4;
208 
209  ast->codecpar->bit_rate = ast->codecpar->sample_rate *
210  ast->codecpar->bits_per_coded_sample *
211  ast->codecpar->channels;
212 
213  ast->codecpar->codec_id = AV_CODEC_ID_NONE;
214  switch (audio_format) {
215  case 1:
216  if (ast->codecpar->bits_per_coded_sample == 16) {
217  // 16-bit audio is always signed
218  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
219  break;
220  } else if (ast->codecpar->bits_per_coded_sample == 8) {
221  if(av_stristr(audio_type, "unsigned") != NULL) {
222  ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
223  break;
224  } else if(av_stristr(audio_type, "linear") != NULL) {
225  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
226  break;
227  } else {
228  ast->codecpar->codec_id = AV_CODEC_ID_PCM_VIDC;
229  break;
230  }
231  }
232  // There are some other formats listed as legal per the spec;
233  // samples needed.
234  break;
235  case 101:
236  if (ast->codecpar->bits_per_coded_sample == 8) {
237  // The samples with this kind of audio that I have
238  // are all unsigned.
239  ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
240  break;
241  } else if (ast->codecpar->bits_per_coded_sample == 4) {
242  ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
243  break;
244  }
245  break;
246  }
247  if (ast->codecpar->codec_id == AV_CODEC_ID_NONE)
248  avpriv_request_sample(s, "Audio format %"PRId32,
249  audio_format);
250  avpriv_set_pts_info(ast, 32, 1, ast->codecpar->bit_rate);
251  } else {
252  for (i = 0; i < 3; i++)
253  error |= read_line(pb, line, sizeof(line));
254  }
255 
256  if (s->nb_streams == 0)
257  return AVERROR_INVALIDDATA;
258 
259  rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
260  if (vst && rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124)
262  "Don't know how to split frames for video format %s. "
263  "Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag));
264 
265  number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
266  // The number in the header is actually the index of the last chunk.
267  number_of_chunks++;
268 
269  error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes
270  error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes
271  chunk_catalog_offset = // offset of the "chunk catalog"
272  read_line_and_int(pb, &error); // (file index)
273  error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite
274  error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite
275  if (vst) {
276  error |= read_line(pb, line, sizeof(line)); // offset to key frame list
277  vst->duration = number_of_chunks * rpl->frames_per_chunk;
278  }
279 
280  // Read the index
281  avio_seek(pb, chunk_catalog_offset, SEEK_SET);
282  total_audio_size = 0;
283  for (i = 0; !error && i < number_of_chunks; i++) {
284  int64_t offset, video_size, audio_size;
285  error |= read_line(pb, line, sizeof(line));
286  if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64,
287  &offset, &video_size, &audio_size)) {
288  error = -1;
289  continue;
290  }
291  if (vst)
293  video_size, rpl->frames_per_chunk, 0);
294  if (ast)
295  av_add_index_entry(ast, offset + video_size, total_audio_size,
296  audio_size, audio_size * 8, 0);
297  total_audio_size += audio_size * 8;
298  }
299 
300  if (error) return AVERROR(EIO);
301 
302  return 0;
303 }
304 
306 {
307  RPLContext *rpl = s->priv_data;
308  AVIOContext *pb = s->pb;
309  AVStream* stream;
310  AVIndexEntry* index_entry;
311  int ret;
312 
313  if (rpl->chunk_part == s->nb_streams) {
314  rpl->chunk_number++;
315  rpl->chunk_part = 0;
316  }
317 
318  stream = s->streams[rpl->chunk_part];
319 
320  if (rpl->chunk_number >= stream->internal->nb_index_entries)
321  return AVERROR_EOF;
322 
323  index_entry = &stream->internal->index_entries[rpl->chunk_number];
324 
325  if (rpl->frame_in_part == 0)
326  if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0)
327  return AVERROR(EIO);
328 
329  if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
330  stream->codecpar->codec_tag == 124) {
331  // We have to split Escape 124 frames because there are
332  // multiple frames per chunk in Escape 124 samples.
333  uint32_t frame_size;
334 
335  avio_skip(pb, 4); /* flags */
336  frame_size = avio_rl32(pb);
337  if (avio_seek(pb, -8, SEEK_CUR) < 0)
338  return AVERROR(EIO);
339 
341  if (ret < 0)
342  return ret;
343  if (ret != frame_size) {
344  return AVERROR(EIO);
345  }
346  pkt->duration = 1;
347  pkt->pts = index_entry->timestamp + rpl->frame_in_part;
348  pkt->stream_index = rpl->chunk_part;
349 
350  rpl->frame_in_part++;
351  if (rpl->frame_in_part == rpl->frames_per_chunk) {
352  rpl->frame_in_part = 0;
353  rpl->chunk_part++;
354  }
355  } else {
356  ret = av_get_packet(pb, pkt, index_entry->size);
357  if (ret < 0)
358  return ret;
359  if (ret != index_entry->size) {
360  return AVERROR(EIO);
361  }
362 
363  if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
364  // frames_per_chunk should always be one here; the header
365  // parsing will warn if it isn't.
366  pkt->duration = rpl->frames_per_chunk;
367  } else {
368  // All the audio codecs supported in this container
369  // (at least so far) are constant-bitrate.
370  pkt->duration = ret * 8;
371  }
372  pkt->pts = index_entry->timestamp;
373  pkt->stream_index = rpl->chunk_part;
374  rpl->chunk_part++;
375  }
376 
377  // None of the Escape formats have keyframes, and the ADPCM
378  // format used doesn't have keyframes.
379  if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
381 
382  return ret;
383 }
384 
386  .name = "rpl",
387  .long_name = NULL_IF_CONFIG_SMALL("RPL / ARMovie"),
388  .priv_data_size = sizeof(RPLContext),
392 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:30
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:313
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
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:4547
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:219
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:55
AVStream::internal
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1112
RPL_SIGNATURE_SIZE
#define RPL_SIGNATURE_SIZE
Definition: rpl.c:31
b
#define b
Definition: input.c:41
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:387
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:410
AVIndexEntry
Definition: avformat.h:803
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
RPL_LINE_LENGTH
#define RPL_LINE_LENGTH
256 is arbitrary, but should be big enough for any reasonable file.
Definition: rpl.c:34
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:2044
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
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:317
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:640
read_int
static int32_t read_int(const char *line, const char **endptr, int *error)
Definition: rpl.c:71
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:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
frame_size
int frame_size
Definition: mxfenc.c:2206
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:814
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:805
ff_rpl_demuxer
AVInputFormat ff_rpl_demuxer
Definition: rpl.c:385
int32_t
int32_t
Definition: audio_convert.c:194
AVFormatContext
Format I/O context.
Definition: avformat.h:1231
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
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
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
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:750
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
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:4993
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.
AVStreamInternal::nb_index_entries
int nb_index_entries
Definition: internal.h:252
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
RPL_SIGNATURE
#define RPL_SIGNATURE
Definition: rpl.c:30
AVStreamInternal::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:250
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:375
i
int i
Definition: input.c:407
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
rpl_probe
static int rpl_probe(const AVProbeData *p)
Definition: rpl.c:36
AVCodecParameters::height
int height
Definition: codec_par.h:127
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:310
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:873
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
avformat.h
dict.h
AV_CODEC_ID_ESCAPE124
@ AV_CODEC_ID_ESCAPE124
Definition: codec_id.h:164
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:804
AVPacket::stream_index
int stream_index
Definition: packet.h:371
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
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:318
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
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:305
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:346
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
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:59
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:364