FFmpeg
subtitles.c
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1 /*
2  * Copyright (c) 2012-2013 Clément Bœsch <u pkh me>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avformat.h"
22 #include "subtitles.h"
23 #include "avio_internal.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/mem.h"
27 
29 {
30  int i;
31  r->pb = pb;
32  r->buf_pos = r->buf_len = 0;
33  r->type = FF_UTF_8;
34  for (i = 0; i < 2; i++)
35  r->buf[r->buf_len++] = avio_r8(r->pb);
36  if (strncmp("\xFF\xFE", r->buf, 2) == 0) {
37  r->type = FF_UTF16LE;
38  r->buf_pos += 2;
39  } else if (strncmp("\xFE\xFF", r->buf, 2) == 0) {
40  r->type = FF_UTF16BE;
41  r->buf_pos += 2;
42  } else {
43  r->buf[r->buf_len++] = avio_r8(r->pb);
44  if (strncmp("\xEF\xBB\xBF", r->buf, 3) == 0) {
45  // UTF8
46  r->buf_pos += 3;
47  }
48  }
49  if (s && (r->type == FF_UTF16LE || r->type == FF_UTF16BE))
51  "UTF16 is automatically converted to UTF8, do not specify a character encoding\n");
52 }
53 
54 void ff_text_init_buf(FFTextReader *r, const void *buf, size_t size)
55 {
56  ffio_init_read_context(&r->buf_pb, buf, size);
57  ff_text_init_avio(NULL, r, &r->buf_pb.pub);
58 }
59 
61 {
62  return avio_tell(r->pb) - r->buf_len + r->buf_pos;
63 }
64 
66 {
67  uint32_t val;
68  uint8_t tmp;
69  if (r->buf_pos < r->buf_len)
70  return r->buf[r->buf_pos++];
71  if (r->type == FF_UTF16LE) {
72  GET_UTF16(val, avio_rl16(r->pb), return 0;)
73  } else if (r->type == FF_UTF16BE) {
74  GET_UTF16(val, avio_rb16(r->pb), return 0;)
75  } else {
76  return avio_r8(r->pb);
77  }
78  if (!val)
79  return 0;
80  r->buf_pos = 0;
81  r->buf_len = 0;
82  PUT_UTF8(val, tmp, r->buf[r->buf_len++] = tmp;)
83  return r->buf[r->buf_pos++]; // buf_len is at least 1
84 }
85 
86 void ff_text_read(FFTextReader *r, char *buf, size_t size)
87 {
88  for ( ; size > 0; size--)
89  *buf++ = ff_text_r8(r);
90 }
91 
93 {
94  return r->buf_pos >= r->buf_len && avio_feof(r->pb);
95 }
96 
98 {
99  int c;
100  if (r->buf_pos < r->buf_len)
101  return r->buf[r->buf_pos];
102  c = ff_text_r8(r);
103  if (!avio_feof(r->pb)) {
104  r->buf_pos = 0;
105  r->buf_len = 1;
106  r->buf[0] = c;
107  }
108  return c;
109 }
110 
112  const uint8_t *event, size_t len, int merge)
113 {
114  AVPacket **subs, *sub;
115 
116  av_assert1(event || len == 0);
117 
118  if (merge && q->nb_subs > 0) {
119  /* merge with previous event */
120 
121  int old_len;
122  sub = q->subs[q->nb_subs - 1];
123  old_len = sub->size;
124  if (event) {
125  if (av_grow_packet(sub, len) < 0)
126  return NULL;
127  memcpy(sub->data + old_len, event, len);
128  }
129  } else {
130  /* new event */
131 
132  if (q->nb_subs >= INT_MAX/sizeof(*q->subs) - 1)
133  return NULL;
134  subs = av_fast_realloc(q->subs, &q->allocated_size,
135  (q->nb_subs + 1) * sizeof(*q->subs));
136  if (!subs)
137  return NULL;
138  q->subs = subs;
139  sub = av_packet_alloc();
140  if (!sub)
141  return NULL;
142  if (event) {
143  if (av_new_packet(sub, len) < 0) {
144  av_packet_free(&sub);
145  return NULL;
146  }
147  memcpy(sub->data, event, len);
148  }
149  sub->flags |= AV_PKT_FLAG_KEY;
150  sub->pts = sub->dts = 0;
151  subs[q->nb_subs++] = sub;
152  }
153  return sub;
154 }
155 
157  const AVBPrint *event, int merge)
158 {
159  if (!av_bprint_is_complete(event))
160  return NULL;
161  return ff_subtitles_queue_insert(q, event->str, event->len, merge);
162 }
163 
164 static int cmp_pkt_sub_ts_pos(const void *a, const void *b)
165 {
166  const AVPacket *s1 = *(const AVPacket **)a;
167  const AVPacket *s2 = *(const AVPacket **)b;
168  if (s1->pts == s2->pts)
169  return FFDIFFSIGN(s1->pos, s2->pos);
170  return FFDIFFSIGN(s1->pts , s2->pts);
171 }
172 
173 static int cmp_pkt_sub_pos_ts(const void *a, const void *b)
174 {
175  const AVPacket *s1 = *(const AVPacket **)a;
176  const AVPacket *s2 = *(const AVPacket **)b;
177  if (s1->pos == s2->pos) {
178  if (s1->pts == s2->pts)
179  return 0;
180  return s1->pts > s2->pts ? 1 : -1;
181  }
182  return s1->pos > s2->pos ? 1 : -1;
183 }
184 
185 static void drop_dups(void *log_ctx, FFDemuxSubtitlesQueue *q)
186 {
187  int i, drop = 0;
188 
189  for (i = 1; i < q->nb_subs; i++) {
190  const int last_id = i - 1 - drop;
191  const AVPacket *last = q->subs[last_id];
192 
193  if (q->subs[i]->pts == last->pts &&
194  q->subs[i]->duration == last->duration &&
195  q->subs[i]->stream_index == last->stream_index &&
196  !strcmp(q->subs[i]->data, last->data)) {
197 
198  av_packet_free(&q->subs[i]);
199  drop++;
200  } else if (drop) {
201  q->subs[last_id + 1] = q->subs[i];
202  q->subs[i] = NULL;
203  }
204  }
205 
206  if (drop) {
207  q->nb_subs -= drop;
208  av_log(log_ctx, AV_LOG_WARNING, "Dropping %d duplicated subtitle events\n", drop);
209  }
210 }
211 
213 {
214  int i;
215 
216  if (!q->nb_subs)
217  return;
218 
219  qsort(q->subs, q->nb_subs, sizeof(*q->subs),
222  for (i = 0; i < q->nb_subs; i++)
223  if (q->subs[i]->duration < 0 && i < q->nb_subs - 1 && q->subs[i + 1]->pts - (uint64_t)q->subs[i]->pts <= INT64_MAX)
224  q->subs[i]->duration = q->subs[i + 1]->pts - q->subs[i]->pts;
225 
226  if (!q->keep_duplicates)
227  drop_dups(log_ctx, q);
228 }
229 
231 {
232  AVPacket *sub;
233  int ret;
234 
235  if (q->current_sub_idx == q->nb_subs)
236  return AVERROR_EOF;
237  sub = q->subs[q->current_sub_idx];
238  if ((ret = av_packet_ref(pkt, sub)) < 0) {
239  return ret;
240  }
241 
242  pkt->dts = pkt->pts;
243  q->current_sub_idx++;
244  return 0;
245 }
246 
247 static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts)
248 {
249  int s1 = 0, s2 = q->nb_subs - 1;
250 
251  if (s2 < s1)
252  return AVERROR(ERANGE);
253 
254  for (;;) {
255  int mid;
256 
257  if (s1 == s2)
258  return s1;
259  if (s1 == s2 - 1)
260  return q->subs[s1]->pts <= q->subs[s2]->pts ? s1 : s2;
261  mid = (s1 + s2) / 2;
262  if (q->subs[mid]->pts <= ts)
263  s1 = mid;
264  else
265  s2 = mid;
266  }
267 }
268 
270  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
271 {
272  if (flags & AVSEEK_FLAG_BYTE) {
273  return AVERROR(ENOSYS);
274  } else if (flags & AVSEEK_FLAG_FRAME) {
275  if (ts < 0 || ts >= q->nb_subs)
276  return AVERROR(ERANGE);
277  q->current_sub_idx = ts;
278  } else {
279  int i, idx = search_sub_ts(q, ts);
280  int64_t ts_selected;
281 
282  if (idx < 0)
283  return idx;
284  for (i = idx; i < q->nb_subs && q->subs[i]->pts < min_ts; i++)
285  if (stream_index == -1 || q->subs[i]->stream_index == stream_index)
286  idx = i;
287  for (i = idx; i > 0 && q->subs[i]->pts > max_ts; i--)
288  if (stream_index == -1 || q->subs[i]->stream_index == stream_index)
289  idx = i;
290 
291  ts_selected = q->subs[idx]->pts;
292  if (ts_selected < min_ts || ts_selected > max_ts)
293  return AVERROR(ERANGE);
294 
295  /* look back in the latest subtitles for overlapping subtitles */
296  for (i = idx - 1; i >= 0; i--) {
297  int64_t pts = q->subs[i]->pts;
298  if (q->subs[i]->duration <= 0 ||
299  (stream_index != -1 && q->subs[i]->stream_index != stream_index))
300  continue;
301  if (pts >= min_ts && pts > ts_selected - q->subs[i]->duration)
302  idx = i;
303  else
304  break;
305  }
306 
307  /* If the queue is used to store multiple subtitles streams (like with
308  * VobSub) and the stream index is not specified, we need to make sure
309  * to focus on the smallest file position offset for a same timestamp;
310  * queue is ordered by pts and then filepos, so we can take the first
311  * entry for a given timestamp. */
312  if (stream_index == -1)
313  while (idx > 0 && q->subs[idx - 1]->pts == q->subs[idx]->pts)
314  idx--;
315 
316  q->current_sub_idx = idx;
317  }
318  return 0;
319 }
320 
322 {
323  int i;
324 
325  for (i = 0; i < q->nb_subs; i++)
326  av_packet_free(&q->subs[i]);
327  av_freep(&q->subs);
328  q->nb_subs = q->allocated_size = q->current_sub_idx = 0;
329 }
330 
332 {
333  FFDemuxSubtitlesQueue *q = s->priv_data;
335 }
336 
337 int ff_subtitles_read_seek(AVFormatContext *s, int stream_index,
338  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
339 {
340  FFDemuxSubtitlesQueue *q = s->priv_data;
341  return ff_subtitles_queue_seek(q, s, stream_index,
342  min_ts, ts, max_ts, flags);
343 }
344 
346 {
347  FFDemuxSubtitlesQueue *q = s->priv_data;
349  return 0;
350 }
351 
352 int ff_smil_extract_next_text_chunk(FFTextReader *tr, AVBPrint *buf, char *c)
353 {
354  int i = 0;
355  char end_chr;
356 
357  if (!*c) // cached char?
358  *c = ff_text_r8(tr);
359  if (!*c)
360  return 0;
361 
362  end_chr = *c == '<' ? '>' : '<';
363  do {
364  av_bprint_chars(buf, *c, 1);
365  *c = ff_text_r8(tr);
366  if (i == INT_MAX)
367  return AVERROR_INVALIDDATA;
368  i++;
369  } while (*c != end_chr && *c);
370  if (end_chr == '>') {
371  av_bprint_chars(buf, '>', 1);
372  *c = 0;
373  }
374  return av_bprint_is_complete(buf) ? i : AVERROR(ENOMEM);
375 }
376 
377 const char *ff_smil_get_attr_ptr(const char *s, const char *attr)
378 {
379  int in_quotes = 0;
380  const size_t len = strlen(attr);
381 
382  while (*s) {
383  while (*s) {
384  if (!in_quotes && av_isspace(*s))
385  break;
386  in_quotes ^= *s == '"'; // XXX: support escaping?
387  s++;
388  }
389  while (av_isspace(*s))
390  s++;
391  if (!av_strncasecmp(s, attr, len) && s[len] == '=')
392  return s + len + 1 + (s[len + 1] == '"');
393  }
394  return NULL;
395 }
396 
397 static inline int is_eol(char c)
398 {
399  return c == '\r' || c == '\n';
400 }
401 
403 {
404  char eol_buf[5], last_was_cr = 0;
405  int n = 0, i = 0, nb_eol = 0;
406 
407  av_bprint_clear(buf);
408 
409  for (;;) {
410  char c = ff_text_r8(tr);
411 
412  if (!c)
413  break;
414 
415  /* ignore all initial line breaks */
416  if (n == 0 && is_eol(c))
417  continue;
418 
419  /* line break buffering: we don't want to add the trailing \r\n */
420  if (is_eol(c)) {
421  nb_eol += c == '\n' || last_was_cr;
422  if (nb_eol == 2)
423  break;
424  eol_buf[i++] = c;
425  if (i == sizeof(eol_buf) - 1)
426  break;
427  last_was_cr = c == '\r';
428  continue;
429  }
430 
431  /* only one line break followed by data: we flush the line breaks
432  * buffer */
433  if (i) {
434  eol_buf[i] = 0;
435  av_bprintf(buf, "%s", eol_buf);
436  i = nb_eol = 0;
437  }
438 
439  av_bprint_chars(buf, c, 1);
440  n++;
441  }
442  return av_bprint_is_complete(buf) ? 0 : AVERROR(ENOMEM);
443 }
444 
445 int ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf)
446 {
447  FFTextReader tr;
448  tr.buf_pos = tr.buf_len = 0;
449  tr.type = 0;
450  tr.pb = pb;
451  return ff_subtitles_read_text_chunk(&tr, buf);
452 }
453 
454 ptrdiff_t ff_subtitles_read_line(FFTextReader *tr, char *buf, size_t size)
455 {
456  size_t cur = 0;
457  if (!size)
458  return 0;
459  buf[0] = '\0';
460  while (cur + 1 < size) {
461  unsigned char c = ff_text_r8(tr);
462  if (!c)
463  return ff_text_eof(tr) ? cur : AVERROR_INVALIDDATA;
464  if (c == '\r' || c == '\n')
465  break;
466  buf[cur++] = c;
467  buf[cur] = '\0';
468  }
469  while (ff_text_peek_r8(tr) == '\r')
470  ff_text_r8(tr);
471  if (ff_text_peek_r8(tr) == '\n')
472  ff_text_r8(tr);
473  return cur;
474 }
ff_subtitles_read_close
int ff_subtitles_read_close(AVFormatContext *s)
Definition: subtitles.c:345
is_eol
static int is_eol(char c)
Definition: subtitles.c:397
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
ff_text_r8
int ff_text_r8(FFTextReader *r)
Return the next byte.
Definition: subtitles.c:65
PUT_UTF8
#define PUT_UTF8(val, tmp, PUT_BYTE)
Definition: common.h:526
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:218
r
const char * r
Definition: vf_curves.c:127
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
ff_smil_extract_next_text_chunk
int ff_smil_extract_next_text_chunk(FFTextReader *tr, AVBPrint *buf, char *c)
SMIL helper to load next chunk ("<...>" or untagged content) in buf.
Definition: subtitles.c:352
FFTextReader::buf_pos
int buf_pos
Definition: subtitles.h:45
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2448
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
FFDemuxSubtitlesQueue::nb_subs
int nb_subs
number of subtitles packets
Definition: subtitles.h:105
av_grow_packet
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: packet.c:121
FFTextReader::type
int type
Definition: subtitles.h:42
av_isspace
static av_const int av_isspace(int c)
Locale-independent conversion of ASCII isspace.
Definition: avstring.h:218
merge
static void merge(GetBitContext *gb, uint8_t *dst, uint8_t *src, int size)
Merge two consequent lists of equal size depending on bits read.
Definition: bink.c:221
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
ff_subtitles_read_text_chunk
int ff_subtitles_read_text_chunk(FFTextReader *tr, AVBPrint *buf)
Read a subtitles chunk from FFTextReader.
Definition: subtitles.c:402
AVPacket::data
uint8_t * data
Definition: packet.h:520
b
#define b
Definition: input.c:41
FFDemuxSubtitlesQueue::keep_duplicates
int keep_duplicates
set to 1 to keep duplicated subtitle events
Definition: subtitles.h:109
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2446
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:538
FF_UTF16LE
@ FF_UTF16LE
Definition: subtitles.h:37
FFTextReader
Definition: subtitles.h:41
ffio_init_read_context
void ffio_init_read_context(FFIOContext *s, const uint8_t *buffer, int buffer_size)
Wrap a buffer in an AVIOContext for reading.
Definition: aviobuf.c:99
ff_subtitles_read_line
ptrdiff_t ff_subtitles_read_line(FFTextReader *tr, char *buf, size_t size)
Read a line of text.
Definition: subtitles.c:454
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:575
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: packet.c:74
ff_subtitles_read_chunk
int ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf)
Same as ff_subtitles_read_text_chunk(), but read from an AVIOContext.
Definition: subtitles.c:445
FFDemuxSubtitlesQueue::current_sub_idx
int current_sub_idx
current position for the read packet callback
Definition: subtitles.h:107
cmp_pkt_sub_ts_pos
static int cmp_pkt_sub_ts_pos(const void *a, const void *b)
Definition: subtitles.c:164
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
val
static double val(void *priv, double ch)
Definition: aeval.c:78
pts
static int64_t pts
Definition: transcode_aac.c:644
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:714
FFDIFFSIGN
#define FFDIFFSIGN(x, y)
Comparator.
Definition: macros.h:45
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:269
avassert.h
pkt
AVPacket * pkt
Definition: movenc.c:60
ff_subtitles_read_packet
int ff_subtitles_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: subtitles.c:331
av_fast_realloc
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
Definition: mem.c:497
s
#define s(width, name)
Definition: cbs_vp9.c:198
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: packet.c:98
s1
#define s1
Definition: regdef.h:38
FFTextReader::pb
AVIOContext * pb
Definition: subtitles.h:43
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:230
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
ff_text_read
void ff_text_read(FFTextReader *r, char *buf, size_t size)
Read the given number of bytes (in UTF-8).
Definition: subtitles.c:86
NULL
#define NULL
Definition: coverity.c:32
av_packet_ref
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
Definition: packet.c:435
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:111
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
ff_text_init_avio
void ff_text_init_avio(void *s, FFTextReader *r, AVIOContext *pb)
Initialize the FFTextReader from the given AVIOContext.
Definition: subtitles.c:28
av_strncasecmp
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
Definition: avstring.c:217
s2
#define s2
Definition: regdef.h:39
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
AVPacket::size
int size
Definition: packet.h:521
size
int size
Definition: twinvq_data.h:10344
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:212
FFDemuxSubtitlesQueue
Definition: subtitles.h:103
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:519
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:603
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
ff_subtitles_queue_clean
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:321
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:526
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: packet.c:63
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
FF_UTF16BE
@ FF_UTF16BE
Definition: subtitles.h:38
ff_subtitles_queue_insert_bprint
AVPacket * ff_subtitles_queue_insert_bprint(FFDemuxSubtitlesQueue *q, const AVBPrint *event, int merge)
Same as ff_subtitles_queue_insert but takes an AVBPrint input.
Definition: subtitles.c:156
drop_dups
static void drop_dups(void *log_ctx, FFDemuxSubtitlesQueue *q)
Definition: subtitles.c:185
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:513
FFDemuxSubtitlesQueue::subs
AVPacket ** subs
array of subtitles packets
Definition: subtitles.h:104
avio_internal.h
SUB_SORT_TS_POS
@ SUB_SORT_TS_POS
sort by timestamps, then position
Definition: subtitles.h:31
ff_text_pos
int64_t ff_text_pos(FFTextReader *r)
Return the byte position of the next byte returned by ff_text_r8().
Definition: subtitles.c:60
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:56
ff_subtitles_read_seek
int ff_subtitles_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: subtitles.c:337
GET_UTF16
#define GET_UTF16(val, GET_16BIT, ERROR)
Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
Definition: common.h:498
len
int len
Definition: vorbis_enc_data.h:426
ret
ret
Definition: filter_design.txt:187
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:746
avformat.h
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:99
ff_text_peek_r8
int ff_text_peek_r8(FFTextReader *r)
Like ff_text_r8(), but don't remove the byte from the buffer.
Definition: subtitles.c:97
subtitles.h
search_sub_ts
static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts)
Definition: subtitles.c:247
av_bprint_clear
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
Definition: bprint.c:232
ff_text_init_buf
void ff_text_init_buf(FFTextReader *r, const void *buf, size_t size)
Similar to ff_text_init_avio(), but sets it up to read from a bounded buffer.
Definition: subtitles.c:54
AVPacket::stream_index
int stream_index
Definition: packet.h:522
mem.h
FFTextReader::buf_len
int buf_len
Definition: subtitles.h:45
FF_UTF_8
@ FF_UTF_8
Definition: subtitles.h:36
ff_text_eof
int ff_text_eof(FFTextReader *r)
Return non-zero if EOF was reached.
Definition: subtitles.c:92
AVPacket
This structure stores compressed data.
Definition: packet.h:497
FFDemuxSubtitlesQueue::allocated_size
int allocated_size
allocated size for subs
Definition: subtitles.h:106
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
FFDemuxSubtitlesQueue::sort
enum sub_sort sort
sort method to use when finalizing subtitles
Definition: subtitles.h:108
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
cmp_pkt_sub_pos_ts
static int cmp_pkt_sub_pos_ts(const void *a, const void *b)
Definition: subtitles.c:173
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:145
avstring.h
ff_smil_get_attr_ptr
const char * ff_smil_get_attr_ptr(const char *s, const char *attr)
SMIL helper to point on the value of an attribute in the given tag.
Definition: subtitles.c:377
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346