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/avstring.h"
25 
27 {
28  int i;
29  r->pb = pb;
30  r->buf_pos = r->buf_len = 0;
31  r->type = FF_UTF_8;
32  for (i = 0; i < 2; i++)
33  r->buf[r->buf_len++] = avio_r8(r->pb);
34  if (strncmp("\xFF\xFE", r->buf, 2) == 0) {
35  r->type = FF_UTF16LE;
36  r->buf_pos += 2;
37  } else if (strncmp("\xFE\xFF", r->buf, 2) == 0) {
38  r->type = FF_UTF16BE;
39  r->buf_pos += 2;
40  } else {
41  r->buf[r->buf_len++] = avio_r8(r->pb);
42  if (strncmp("\xEF\xBB\xBF", r->buf, 3) == 0) {
43  // UTF8
44  r->buf_pos += 3;
45  }
46  }
47  if (s && (r->type == FF_UTF16LE || r->type == FF_UTF16BE))
49  "UTF16 is automatically converted to UTF8, do not specify a character encoding\n");
50 }
51 
52 void ff_text_init_buf(FFTextReader *r, void *buf, size_t size)
53 {
54  ffio_init_context(&r->buf_pb, buf, size, 0, NULL, NULL, NULL, NULL);
55  ff_text_init_avio(NULL, r, &r->buf_pb.pub);
56 }
57 
59 {
60  return avio_tell(r->pb) - r->buf_len + r->buf_pos;
61 }
62 
64 {
65  uint32_t val;
66  uint8_t tmp;
67  if (r->buf_pos < r->buf_len)
68  return r->buf[r->buf_pos++];
69  if (r->type == FF_UTF16LE) {
70  GET_UTF16(val, avio_rl16(r->pb), return 0;)
71  } else if (r->type == FF_UTF16BE) {
72  GET_UTF16(val, avio_rb16(r->pb), return 0;)
73  } else {
74  return avio_r8(r->pb);
75  }
76  if (!val)
77  return 0;
78  r->buf_pos = 0;
79  r->buf_len = 0;
80  PUT_UTF8(val, tmp, r->buf[r->buf_len++] = tmp;)
81  return r->buf[r->buf_pos++]; // buf_len is at least 1
82 }
83 
84 void ff_text_read(FFTextReader *r, char *buf, size_t size)
85 {
86  for ( ; size > 0; size--)
87  *buf++ = ff_text_r8(r);
88 }
89 
91 {
92  return r->buf_pos >= r->buf_len && avio_feof(r->pb);
93 }
94 
96 {
97  int c;
98  if (r->buf_pos < r->buf_len)
99  return r->buf[r->buf_pos];
100  c = ff_text_r8(r);
101  if (!avio_feof(r->pb)) {
102  r->buf_pos = 0;
103  r->buf_len = 1;
104  r->buf[0] = c;
105  }
106  return c;
107 }
108 
110  const uint8_t *event, size_t len, int merge)
111 {
112  AVPacket **subs, *sub;
113 
114  if (merge && q->nb_subs > 0) {
115  /* merge with previous event */
116 
117  int old_len;
118  sub = q->subs[q->nb_subs - 1];
119  old_len = sub->size;
120  if (av_grow_packet(sub, len) < 0)
121  return NULL;
122  memcpy(sub->data + old_len, event, len);
123  } else {
124  /* new event */
125 
126  if (q->nb_subs >= INT_MAX/sizeof(*q->subs) - 1)
127  return NULL;
128  subs = av_fast_realloc(q->subs, &q->allocated_size,
129  (q->nb_subs + 1) * sizeof(*q->subs));
130  if (!subs)
131  return NULL;
132  q->subs = subs;
133  sub = av_packet_alloc();
134  if (!sub)
135  return NULL;
136  if (av_new_packet(sub, len) < 0) {
138  return NULL;
139  }
140  subs[q->nb_subs++] = sub;
141  sub->flags |= AV_PKT_FLAG_KEY;
142  sub->pts = sub->dts = 0;
143  memcpy(sub->data, event, len);
144  }
145  return sub;
146 }
147 
148 static int cmp_pkt_sub_ts_pos(const void *a, const void *b)
149 {
150  const AVPacket *s1 = *(const AVPacket **)a;
151  const AVPacket *s2 = *(const AVPacket **)b;
152  if (s1->pts == s2->pts)
153  return FFDIFFSIGN(s1->pos, s2->pos);
154  return FFDIFFSIGN(s1->pts , s2->pts);
155 }
156 
157 static int cmp_pkt_sub_pos_ts(const void *a, const void *b)
158 {
159  const AVPacket *s1 = *(const AVPacket **)a;
160  const AVPacket *s2 = *(const AVPacket **)b;
161  if (s1->pos == s2->pos) {
162  if (s1->pts == s2->pts)
163  return 0;
164  return s1->pts > s2->pts ? 1 : -1;
165  }
166  return s1->pos > s2->pos ? 1 : -1;
167 }
168 
169 static void drop_dups(void *log_ctx, FFDemuxSubtitlesQueue *q)
170 {
171  int i, drop = 0;
172 
173  for (i = 1; i < q->nb_subs; i++) {
174  const int last_id = i - 1 - drop;
175  const AVPacket *last = q->subs[last_id];
176 
177  if (q->subs[i]->pts == last->pts &&
178  q->subs[i]->duration == last->duration &&
179  q->subs[i]->stream_index == last->stream_index &&
180  !strcmp(q->subs[i]->data, last->data)) {
181 
182  av_packet_free(&q->subs[i]);
183  drop++;
184  } else if (drop) {
185  q->subs[last_id + 1] = q->subs[i];
186  q->subs[i] = NULL;
187  }
188  }
189 
190  if (drop) {
191  q->nb_subs -= drop;
192  av_log(log_ctx, AV_LOG_WARNING, "Dropping %d duplicated subtitle events\n", drop);
193  }
194 }
195 
197 {
198  int i;
199 
200  if (!q->nb_subs)
201  return;
202 
203  qsort(q->subs, q->nb_subs, sizeof(*q->subs),
206  for (i = 0; i < q->nb_subs; i++)
207  if (q->subs[i]->duration < 0 && i < q->nb_subs - 1 && q->subs[i + 1]->pts - (uint64_t)q->subs[i]->pts <= INT64_MAX)
208  q->subs[i]->duration = q->subs[i + 1]->pts - q->subs[i]->pts;
209 
210  if (!q->keep_duplicates)
211  drop_dups(log_ctx, q);
212 }
213 
215 {
216  AVPacket *sub;
217  int ret;
218 
219  if (q->current_sub_idx == q->nb_subs)
220  return AVERROR_EOF;
221  sub = q->subs[q->current_sub_idx];
222  if ((ret = av_packet_ref(pkt, sub)) < 0) {
223  return ret;
224  }
225 
226  pkt->dts = pkt->pts;
227  q->current_sub_idx++;
228  return 0;
229 }
230 
231 static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts)
232 {
233  int s1 = 0, s2 = q->nb_subs - 1;
234 
235  if (s2 < s1)
236  return AVERROR(ERANGE);
237 
238  for (;;) {
239  int mid;
240 
241  if (s1 == s2)
242  return s1;
243  if (s1 == s2 - 1)
244  return q->subs[s1]->pts <= q->subs[s2]->pts ? s1 : s2;
245  mid = (s1 + s2) / 2;
246  if (q->subs[mid]->pts <= ts)
247  s1 = mid;
248  else
249  s2 = mid;
250  }
251 }
252 
254  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
255 {
256  if (flags & AVSEEK_FLAG_BYTE) {
257  return AVERROR(ENOSYS);
258  } else if (flags & AVSEEK_FLAG_FRAME) {
259  if (ts < 0 || ts >= q->nb_subs)
260  return AVERROR(ERANGE);
261  q->current_sub_idx = ts;
262  } else {
263  int i, idx = search_sub_ts(q, ts);
264  int64_t ts_selected;
265 
266  if (idx < 0)
267  return idx;
268  for (i = idx; i < q->nb_subs && q->subs[i]->pts < min_ts; i++)
269  if (stream_index == -1 || q->subs[i]->stream_index == stream_index)
270  idx = i;
271  for (i = idx; i > 0 && q->subs[i]->pts > max_ts; i--)
272  if (stream_index == -1 || q->subs[i]->stream_index == stream_index)
273  idx = i;
274 
275  ts_selected = q->subs[idx]->pts;
276  if (ts_selected < min_ts || ts_selected > max_ts)
277  return AVERROR(ERANGE);
278 
279  /* look back in the latest subtitles for overlapping subtitles */
280  for (i = idx - 1; i >= 0; i--) {
281  int64_t pts = q->subs[i]->pts;
282  if (q->subs[i]->duration <= 0 ||
283  (stream_index != -1 && q->subs[i]->stream_index != stream_index))
284  continue;
285  if (pts >= min_ts && pts > ts_selected - q->subs[i]->duration)
286  idx = i;
287  else
288  break;
289  }
290 
291  /* If the queue is used to store multiple subtitles streams (like with
292  * VobSub) and the stream index is not specified, we need to make sure
293  * to focus on the smallest file position offset for a same timestamp;
294  * queue is ordered by pts and then filepos, so we can take the first
295  * entry for a given timestamp. */
296  if (stream_index == -1)
297  while (idx > 0 && q->subs[idx - 1]->pts == q->subs[idx]->pts)
298  idx--;
299 
300  q->current_sub_idx = idx;
301  }
302  return 0;
303 }
304 
306 {
307  int i;
308 
309  for (i = 0; i < q->nb_subs; i++)
310  av_packet_free(&q->subs[i]);
311  av_freep(&q->subs);
312  q->nb_subs = q->allocated_size = q->current_sub_idx = 0;
313 }
314 
316 {
317  FFDemuxSubtitlesQueue *q = s->priv_data;
319 }
320 
321 int ff_subtitles_read_seek(AVFormatContext *s, int stream_index,
322  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
323 {
324  FFDemuxSubtitlesQueue *q = s->priv_data;
325  return ff_subtitles_queue_seek(q, s, stream_index,
326  min_ts, ts, max_ts, flags);
327 }
328 
330 {
331  FFDemuxSubtitlesQueue *q = s->priv_data;
333  return 0;
334 }
335 
336 int ff_smil_extract_next_text_chunk(FFTextReader *tr, AVBPrint *buf, char *c)
337 {
338  int i = 0;
339  char end_chr;
340 
341  if (!*c) // cached char?
342  *c = ff_text_r8(tr);
343  if (!*c)
344  return 0;
345 
346  end_chr = *c == '<' ? '>' : '<';
347  do {
348  av_bprint_chars(buf, *c, 1);
349  *c = ff_text_r8(tr);
350  i++;
351  } while (*c != end_chr && *c);
352  if (end_chr == '>') {
353  av_bprint_chars(buf, '>', 1);
354  *c = 0;
355  }
356  return i;
357 }
358 
359 const char *ff_smil_get_attr_ptr(const char *s, const char *attr)
360 {
361  int in_quotes = 0;
362  const size_t len = strlen(attr);
363 
364  while (*s) {
365  while (*s) {
366  if (!in_quotes && av_isspace(*s))
367  break;
368  in_quotes ^= *s == '"'; // XXX: support escaping?
369  s++;
370  }
371  while (av_isspace(*s))
372  s++;
373  if (!av_strncasecmp(s, attr, len) && s[len] == '=')
374  return s + len + 1 + (s[len + 1] == '"');
375  }
376  return NULL;
377 }
378 
379 static inline int is_eol(char c)
380 {
381  return c == '\r' || c == '\n';
382 }
383 
385 {
386  char eol_buf[5], last_was_cr = 0;
387  int n = 0, i = 0, nb_eol = 0;
388 
389  av_bprint_clear(buf);
390 
391  for (;;) {
392  char c = ff_text_r8(tr);
393 
394  if (!c)
395  break;
396 
397  /* ignore all initial line breaks */
398  if (n == 0 && is_eol(c))
399  continue;
400 
401  /* line break buffering: we don't want to add the trailing \r\n */
402  if (is_eol(c)) {
403  nb_eol += c == '\n' || last_was_cr;
404  if (nb_eol == 2)
405  break;
406  eol_buf[i++] = c;
407  if (i == sizeof(eol_buf) - 1)
408  break;
409  last_was_cr = c == '\r';
410  continue;
411  }
412 
413  /* only one line break followed by data: we flush the line breaks
414  * buffer */
415  if (i) {
416  eol_buf[i] = 0;
417  av_bprintf(buf, "%s", eol_buf);
418  i = nb_eol = 0;
419  }
420 
421  av_bprint_chars(buf, c, 1);
422  n++;
423  }
424 }
425 
426 void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf)
427 {
428  FFTextReader tr;
429  tr.buf_pos = tr.buf_len = 0;
430  tr.type = 0;
431  tr.pb = pb;
433 }
434 
435 ptrdiff_t ff_subtitles_read_line(FFTextReader *tr, char *buf, size_t size)
436 {
437  size_t cur = 0;
438  if (!size)
439  return 0;
440  while (cur + 1 < size) {
441  unsigned char c = ff_text_r8(tr);
442  if (!c)
443  return ff_text_eof(tr) ? cur : AVERROR_INVALIDDATA;
444  if (c == '\r' || c == '\n')
445  break;
446  buf[cur++] = c;
447  buf[cur] = '\0';
448  }
449  while (ff_text_peek_r8(tr) == '\r')
450  ff_text_r8(tr);
451  if (ff_text_peek_r8(tr) == '\n')
452  ff_text_r8(tr);
453  return cur;
454 }
ff_subtitles_read_close
int ff_subtitles_read_close(AVFormatContext *s)
Definition: subtitles.c:329
is_eol
static int is_eol(char c)
Definition: subtitles.c:379
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:63
PUT_UTF8
#define PUT_UTF8(val, tmp, PUT_BYTE)
Definition: common.h:523
r
const char * r
Definition: vf_curves.c:116
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:336
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:2154
sub
static float sub(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:31
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: avpacket.c:122
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:227
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:220
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:26
AVPacket::data
uint8_t * data
Definition: packet.h:373
b
#define b
Definition: input.c:40
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:2152
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
FF_UTF16LE
@ FF_UTF16LE
Definition: subtitles.h:37
FFTextReader
Definition: subtitles.h:41
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:435
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
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:148
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:486
val
static double val(void *priv, double ch)
Definition: aeval.c:76
pts
static int64_t pts
Definition: transcode_aac.c:653
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:726
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:253
pkt
AVPacket * pkt
Definition: movenc.c:59
ff_text_init_buf
void ff_text_init_buf(FFTextReader *r, void *buf, size_t size)
Similar to ff_text_init_avio(), but sets it up to read from a bounded buffer.
Definition: subtitles.c:52
ff_subtitles_read_packet
int ff_subtitles_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: subtitles.c:315
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:504
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
ff_subtitles_read_text_chunk
void ff_subtitles_read_text_chunk(FFTextReader *tr, AVBPrint *buf)
Read a subtitles chunk from FFTextReader.
Definition: subtitles.c:384
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:214
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
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:84
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: avpacket.c:425
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
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:26
av_strncasecmp
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
Definition: avstring.c:225
s2
#define s2
Definition: regdef.h:39
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
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:196
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:372
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
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:305
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
FF_UTF16BE
@ FF_UTF16BE
Definition: subtitles.h:38
drop_dups
static void drop_dups(void *log_ctx, FFDemuxSubtitlesQueue *q)
Definition: subtitles.c:169
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
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:58
ffio_init_context
void ffio_init_context(FFIOContext *s, unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Definition: aviobuf.c:80
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:321
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:495
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:758
ff_subtitles_read_chunk
void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf)
Same as ff_subtitles_read_text_chunk(), but read from an AVIOContext.
Definition: subtitles.c:426
avformat.h
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:93
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:95
av_bprint_clear
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
Definition: bprint.c:226
subtitles.h
search_sub_ts
static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts)
Definition: subtitles.c:231
AVPacket::stream_index
int stream_index
Definition: packet.h:375
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:90
AVPacket
This structure stores compressed data.
Definition: packet.h:350
FFDemuxSubtitlesQueue::allocated_size
int allocated_size
allocated size for subs
Definition: subtitles.h:106
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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:28
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:157
avstring.h
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
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:359
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:360