FFmpeg
tedcaptionsdec.c
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1 /*
2  * TED Talks captions format decoder
3  * Copyright (c) 2012 Nicolas George
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 "libavutil/bprint.h"
23 #include "libavutil/log.h"
24 #include "libavutil/opt.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "subtitles.h"
28 
29 typedef struct {
30  AVClass *class;
31  int64_t start_time;
34 
35 static const AVOption tedcaptions_options[] = {
36  { "start_time", "set the start time (offset) of the subtitles, in ms",
38  { .i64 = 15000 }, INT64_MIN, INT64_MAX,
40  { NULL },
41 };
42 
44  .class_name = "tedcaptions_demuxer",
45  .item_name = av_default_item_name,
46  .option = tedcaptions_options,
47  .version = LIBAVUTIL_VERSION_INT,
48 };
49 
50 #define BETWEEN(a, amin, amax) ((unsigned)((a) - (amin)) <= (amax) - (amin))
51 
52 #define HEX_DIGIT_TEST(c) (BETWEEN(c, '0', '9') || BETWEEN((c) | 32, 'a', 'z'))
53 #define HEX_DIGIT_VAL(c) ((c) <= '9' ? (c) - '0' : ((c) | 32) - 'a' + 10)
54 #define ERR_CODE(c) ((c) < 0 ? (c) : AVERROR_INVALIDDATA)
55 
56 static void av_bprint_utf8(AVBPrint *bp, unsigned c)
57 {
58  int bytes, i;
59 
60  if (c <= 0x7F) {
61  av_bprint_chars(bp, c, 1);
62  return;
63  }
64  bytes = (av_log2(c) - 2) / 5;
65  av_bprint_chars(bp, (c >> (bytes * 6)) | ((0xFF80 >> bytes) & 0xFF), 1);
66  for (i = bytes - 1; i >= 0; i--)
67  av_bprint_chars(bp, ((c >> (i * 6)) & 0x3F) | 0x80, 1);
68 }
69 
70 static void next_byte(AVIOContext *pb, int *cur_byte)
71 {
72  uint8_t b;
73  int ret = avio_read(pb, &b, 1);
74  *cur_byte = ret > 0 ? b : ret == 0 ? AVERROR_EOF : ret;
75 }
76 
77 static void skip_spaces(AVIOContext *pb, int *cur_byte)
78 {
79  while (*cur_byte == ' ' || *cur_byte == '\t' ||
80  *cur_byte == '\n' || *cur_byte == '\r')
81  next_byte(pb, cur_byte);
82 }
83 
84 static int expect_byte(AVIOContext *pb, int *cur_byte, uint8_t c)
85 {
86  skip_spaces(pb, cur_byte);
87  if (*cur_byte != c)
88  return ERR_CODE(*cur_byte);
89  next_byte(pb, cur_byte);
90  return 0;
91 }
92 
93 static int parse_string(AVIOContext *pb, int *cur_byte, AVBPrint *bp, int full)
94 {
95  int ret;
96 
97  ret = expect_byte(pb, cur_byte, '"');
98  if (ret < 0)
99  return ret;
100  while (*cur_byte > 0 && *cur_byte != '"') {
101  if (*cur_byte == '\\') {
102  next_byte(pb, cur_byte);
103  if (*cur_byte < 0)
104  return AVERROR_INVALIDDATA;
105  if ((*cur_byte | 32) == 'u') {
106  unsigned chr = 0, i;
107  for (i = 0; i < 4; i++) {
108  next_byte(pb, cur_byte);
109  if (!HEX_DIGIT_TEST(*cur_byte))
110  return ERR_CODE(*cur_byte);
111  chr = chr * 16 + HEX_DIGIT_VAL(*cur_byte);
112  }
113  av_bprint_utf8(bp, chr);
114  } else {
115  av_bprint_chars(bp, *cur_byte, 1);
116  }
117  } else {
118  av_bprint_chars(bp, *cur_byte, 1);
119  }
120  next_byte(pb, cur_byte);
121  }
122  ret = expect_byte(pb, cur_byte, '"');
123  if (ret < 0)
124  return ret;
125  if (full && !av_bprint_is_complete(bp))
126  return AVERROR(ENOMEM);
127 
128  return 0;
129 }
130 
131 static int parse_label(AVIOContext *pb, int *cur_byte, AVBPrint *bp)
132 {
133  int ret;
134 
136  ret = parse_string(pb, cur_byte, bp, 0);
137  if (ret < 0)
138  return ret;
139  ret = expect_byte(pb, cur_byte, ':');
140  if (ret < 0)
141  return ret;
142  return 0;
143 }
144 
145 static int parse_boolean(AVIOContext *pb, int *cur_byte, int *result)
146 {
147  static const char * const text[] = { "false", "true" };
148  const char *p;
149  int i;
150 
151  skip_spaces(pb, cur_byte);
152  for (i = 0; i < 2; i++) {
153  p = text[i];
154  if (*cur_byte != *p)
155  continue;
156  for (; *p; p++, next_byte(pb, cur_byte))
157  if (*cur_byte != *p)
158  return AVERROR_INVALIDDATA;
159  if (BETWEEN(*cur_byte | 32, 'a', 'z'))
160  return AVERROR_INVALIDDATA;
161  *result = i;
162  return 0;
163  }
164  return AVERROR_INVALIDDATA;
165 }
166 
167 static int parse_int(AVIOContext *pb, int *cur_byte, int64_t *result)
168 {
169  int64_t val = 0;
170 
171  skip_spaces(pb, cur_byte);
172  if ((unsigned)*cur_byte - '0' > 9)
173  return AVERROR_INVALIDDATA;
174  while (BETWEEN(*cur_byte, '0', '9')) {
175  if (val > INT_MAX/10 - (*cur_byte - '0'))
176  return AVERROR_INVALIDDATA;
177  val = val * 10 + (*cur_byte - '0');
178  next_byte(pb, cur_byte);
179  }
180  *result = val;
181  return 0;
182 }
183 
185 {
186  int ret, cur_byte, start_of_par;
187  AVBPrint label, content;
188  int64_t pos, start, duration;
189  AVPacket *pkt;
190 
192 
193  next_byte(pb, &cur_byte);
194  ret = expect_byte(pb, &cur_byte, '{');
195  if (ret < 0)
196  return AVERROR_INVALIDDATA;
197  ret = parse_label(pb, &cur_byte, &label);
198  if (ret < 0 || strcmp(label.str, "captions"))
199  return AVERROR_INVALIDDATA;
200  ret = expect_byte(pb, &cur_byte, '[');
201  if (ret < 0)
202  return AVERROR_INVALIDDATA;
203  while (1) {
204  start = duration = AV_NOPTS_VALUE;
205  ret = expect_byte(pb, &cur_byte, '{');
206  if (ret < 0)
207  goto fail;
208  pos = avio_tell(pb) - 1;
209  while (1) {
210  ret = parse_label(pb, &cur_byte, &label);
211  if (ret < 0)
212  goto fail;
213  if (!strcmp(label.str, "startOfParagraph")) {
214  ret = parse_boolean(pb, &cur_byte, &start_of_par);
215  if (ret < 0)
216  goto fail;
217  } else if (!strcmp(label.str, "content")) {
218  ret = parse_string(pb, &cur_byte, &content, 1);
219  if (ret < 0)
220  goto fail;
221  } else if (!strcmp(label.str, "startTime")) {
222  ret = parse_int(pb, &cur_byte, &start);
223  if (ret < 0)
224  goto fail;
225  } else if (!strcmp(label.str, "duration")) {
226  ret = parse_int(pb, &cur_byte, &duration);
227  if (ret < 0)
228  goto fail;
229  } else {
231  goto fail;
232  }
233  skip_spaces(pb, &cur_byte);
234  if (cur_byte != ',')
235  break;
236  next_byte(pb, &cur_byte);
237  }
238  ret = expect_byte(pb, &cur_byte, '}');
239  if (ret < 0)
240  goto fail;
241 
242  if (!content.size || start == AV_NOPTS_VALUE ||
245  goto fail;
246  }
247  pkt = ff_subtitles_queue_insert(subs, content.str, content.len, 0);
248  if (!pkt) {
249  ret = AVERROR(ENOMEM);
250  goto fail;
251  }
252  pkt->pos = pos;
253  pkt->pts = start;
254  pkt->duration = duration;
255  av_bprint_clear(&content);
256 
257  skip_spaces(pb, &cur_byte);
258  if (cur_byte != ',')
259  break;
260  next_byte(pb, &cur_byte);
261  }
262  ret = expect_byte(pb, &cur_byte, ']');
263  if (ret < 0)
264  goto fail;
265  ret = expect_byte(pb, &cur_byte, '}');
266  if (ret < 0)
267  goto fail;
268  skip_spaces(pb, &cur_byte);
269  if (cur_byte != AVERROR_EOF)
270  ret = ERR_CODE(cur_byte);
271 fail:
272  av_bprint_finalize(&content, NULL);
273  return ret;
274 }
275 
277 {
279  AVStream *st = avformat_new_stream(avf, NULL);
280  FFStream *sti;
281  int ret, i;
282  AVPacket *last;
283 
284  if (!st)
285  return AVERROR(ENOMEM);
286 
287  sti = ffstream(st);
288  ret = parse_file(avf->pb, &tc->subs);
289  if (ret < 0) {
290  if (ret == AVERROR_INVALIDDATA)
291  av_log(avf, AV_LOG_ERROR, "Syntax error near offset %"PRId64".\n",
292  avio_tell(avf->pb));
293  return ret;
294  }
295  ff_subtitles_queue_finalize(avf, &tc->subs);
296  for (i = 0; i < tc->subs.nb_subs; i++)
297  tc->subs.subs[i]->pts += tc->start_time;
298 
299  last = tc->subs.subs[tc->subs.nb_subs - 1];
302  avpriv_set_pts_info(st, 64, 1, 1000);
303  sti->probe_packets = 0;
304  st->start_time = 0;
305  st->duration = last->pts + last->duration;
306  sti->cur_dts = 0;
307 
308  return 0;
309 }
310 
312 {
314 
315  return ff_subtitles_queue_read_packet(&tc->subs, packet);
316 }
317 
319 {
321 
323  return 0;
324 }
325 
327 {
328  static const char *const tags[] = {
329  "\"captions\"", "\"duration\"", "\"content\"",
330  "\"startOfParagraph\"", "\"startTime\"",
331  };
332  unsigned i, count = 0;
333  const char *t;
334 
335  if (p->buf[strspn(p->buf, " \t\r\n")] != '{')
336  return 0;
337  for (i = 0; i < FF_ARRAY_ELEMS(tags); i++) {
338  if (!(t = strstr(p->buf, tags[i])))
339  continue;
340  t += strlen(tags[i]);
341  t += strspn(t, " \t\r\n");
342  if (*t == ':')
343  count++;
344  }
345  return count == FF_ARRAY_ELEMS(tags) ? AVPROBE_SCORE_MAX :
346  count ? AVPROBE_SCORE_EXTENSION : 0;
347 }
348 
349 static int tedcaptions_read_seek(AVFormatContext *avf, int stream_index,
350  int64_t min_ts, int64_t ts, int64_t max_ts,
351  int flags)
352 {
354  return ff_subtitles_queue_seek(&tc->subs, avf, stream_index,
355  min_ts, ts, max_ts, flags);
356 }
357 
359  .name = "tedcaptions",
360  .long_name = NULL_IF_CONFIG_SMALL("TED Talks captions"),
361  .priv_data_size = sizeof(TEDCaptionsDemuxer),
362  .flags_internal = FF_FMT_INIT_CLEANUP,
363  .priv_class = &tedcaptions_demuxer_class,
368  .read_seek2 = tedcaptions_read_seek,
369 };
skip_spaces
static void skip_spaces(AVIOContext *pb, int *cur_byte)
Definition: tedcaptionsdec.c:77
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
FF_FMT_INIT_CLEANUP
#define FF_FMT_INIT_CLEANUP
For an AVInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: internal.h:48
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
opt.h
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:724
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:234
tedcaptions_options
static const AVOption tedcaptions_options[]
Definition: tedcaptionsdec.c:35
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:68
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
tedcaptions_read_seek
static int tedcaptions_read_seek(AVFormatContext *avf, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: tedcaptionsdec.c:349
AVOption
AVOption.
Definition: opt.h:247
b
#define b
Definition: input.c:40
ff_tedcaptions_demuxer
const AVInputFormat ff_tedcaptions_demuxer
Definition: tedcaptionsdec.c:358
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
ERR_CODE
#define ERR_CODE(c)
Definition: tedcaptionsdec.c:54
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:429
fail
#define fail()
Definition: checkasm.h:127
TEDCaptionsDemuxer::start_time
int64_t start_time
Definition: tedcaptionsdec.c:31
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:141
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:486
AV_BPRINT_SIZE_AUTOMATIC
#define AV_BPRINT_SIZE_AUTOMATIC
val
static double val(void *priv, double ch)
Definition: aeval.c:76
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:900
ff_subtitles_queue_seek
int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Update current_sub_idx to emulate a seek.
Definition: subtitles.c:253
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:638
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
HEX_DIGIT_VAL
#define HEX_DIGIT_VAL(c)
Definition: tedcaptionsdec.c:53
duration
int64_t duration
Definition: movenc.c:64
TEDCaptionsDemuxer
Definition: tedcaptionsdec.c:29
tedcaptions_demuxer_class
static const AVClass tedcaptions_demuxer_class
Definition: tedcaptionsdec.c:43
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:643
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:225
TEDCaptionsDemuxer::subs
FFDemuxSubtitlesQueue subs
Definition: tedcaptionsdec.c:32
ff_subtitles_queue_read_packet
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:214
AVFormatContext
Format I/O context.
Definition: avformat.h:1109
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1004
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
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
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1151
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
tedcaptions_read_packet
static int tedcaptions_read_packet(AVFormatContext *avf, AVPacket *packet)
Definition: tedcaptionsdec.c:311
ff_subtitles_queue_insert
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, size_t len, int merge)
Insert a new subtitle event.
Definition: subtitles.c:109
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
av_bprint_is_complete
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
HEX_DIGIT_TEST
#define HEX_DIGIT_TEST(c)
Definition: tedcaptionsdec.c:52
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:191
start_time
static int64_t start_time
Definition: ffplay.c:330
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
ff_subtitles_queue_finalize
void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q)
Set missing durations, sort subtitles by PTS (and then byte position), and drop duplicated events.
Definition: subtitles.c:196
av_bprint_utf8
static void av_bprint_utf8(AVBPrint *bp, unsigned c)
Definition: tedcaptionsdec.c:56
FFDemuxSubtitlesQueue
Definition: subtitles.h:103
ff_subtitles_queue_clean
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:305
tedcaptions_read_probe
static av_cold int tedcaptions_read_probe(const AVProbeData *p)
Definition: tedcaptionsdec.c:326
FFStream::probe_packets
int probe_packets
Number of packets to buffer for codec probing.
Definition: internal.h:399
parse_string
static int parse_string(AVIOContext *pb, int *cur_byte, AVBPrint *bp, int full)
Definition: tedcaptionsdec.c:93
parse_int
static int parse_int(AVIOContext *pb, int *cur_byte, int64_t *result)
Definition: tedcaptionsdec.c:167
bprint.h
log.h
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
expect_byte
static int expect_byte(AVIOContext *pb, int *cur_byte, uint8_t c)
Definition: tedcaptionsdec.c:84
AV_OPT_FLAG_DECODING_PARAM
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:278
next_byte
static void next_byte(AVIOContext *pb, int *cur_byte)
Definition: tedcaptionsdec.c:70
tedcaptions_read_close
static int tedcaptions_read_close(AVFormatContext *avf)
Definition: tedcaptionsdec.c:318
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:857
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
AV_CODEC_ID_TEXT
@ AV_CODEC_ID_TEXT
raw UTF-8 text
Definition: codec_id.h:524
av_bprint_clear
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
Definition: bprint.c:226
subtitles.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
parse_file
static int parse_file(AVIOContext *pb, FFDemuxSubtitlesQueue *subs)
Definition: tedcaptionsdec.c:184
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:1146
parse_boolean
static int parse_boolean(AVIOContext *pb, int *cur_byte, int *result)
Definition: tedcaptionsdec.c:145
tc
#define tc
Definition: regdef.h:69
AV_OPT_FLAG_SUBTITLE_PARAM
#define AV_OPT_FLAG_SUBTITLE_PARAM
Definition: opt.h:281
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
FFStream::cur_dts
int64_t cur_dts
Definition: internal.h:426
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:393
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:890
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1137
parse_label
static int parse_label(AVIOContext *pb, int *cur_byte, AVBPrint *bp)
Definition: tedcaptionsdec.c:131
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
tedcaptions_read_header
static av_cold int tedcaptions_read_header(AVFormatContext *avf)
Definition: tedcaptionsdec.c:276
BETWEEN
#define BETWEEN(a, amin, amax)
Definition: tedcaptionsdec.c:50
av_bprint_chars
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:139