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movtextdec.c
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1 /*
2  * 3GPP TS 26.245 Timed Text decoder
3  * Copyright (c) 2012 Philip Langdale <philipl@overt.org>
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 "avcodec.h"
23 #include "ass.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/common.h"
26 #include "libavutil/bprint.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mem.h"
29 
30 #define STYLE_FLAG_BOLD (1<<0)
31 #define STYLE_FLAG_ITALIC (1<<1)
32 #define STYLE_FLAG_UNDERLINE (1<<2)
33 
34 #define BOX_SIZE_INITIAL 40
35 
36 #define STYL_BOX (1<<0)
37 #define HLIT_BOX (1<<1)
38 #define HCLR_BOX (1<<2)
39 #define TWRP_BOX (1<<3)
40 
41 #define BOTTOM_LEFT 1
42 #define BOTTOM_CENTER 2
43 #define BOTTOM_RIGHT 3
44 #define MIDDLE_LEFT 4
45 #define MIDDLE_CENTER 5
46 #define MIDDLE_RIGHT 6
47 #define TOP_LEFT 7
48 #define TOP_CENTER 8
49 #define TOP_RIGHT 9
50 
51 typedef struct {
52  char *font;
53  int fontsize;
54  int color;
56  int bold;
57  int italic;
58  int underline;
59  int alignment;
61 
62 typedef struct {
63  uint16_t fontID;
64  char *font;
65 } FontRecord;
66 
67 typedef struct {
68  uint16_t style_start;
69  uint16_t style_end;
72  uint16_t style_fontID;
73 } StyleBox;
74 
75 typedef struct {
76  uint16_t hlit_start;
77  uint16_t hlit_end;
78 } HighlightBox;
79 
80 typedef struct {
81  uint8_t hlit_color[4];
83 
84 typedef struct {
86 } TextWrapBox;
87 
88 typedef struct {
98  uint16_t style_entries, ftab_entries;
99  uint64_t tracksize;
100  int size_var;
101  int count_s, count_f;
103 
104 typedef struct {
105  uint32_t type;
106  size_t base_size;
107  int (*decode)(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt);
108 } Box;
109 
111 {
112  int i;
113  if (m->box_flags & STYL_BOX) {
114  for(i = 0; i < m->count_s; i++) {
115  av_freep(&m->s[i]);
116  }
117  av_freep(&m->s);
118  }
119 }
120 
122 {
123  int i;
124  if (m->ftab_temp)
125  av_freep(&m->ftab_temp->font);
126  av_freep(&m->ftab_temp);
127  if (m->ftab) {
128  for(i = 0; i < m->count_f; i++) {
129  av_freep(&m->ftab[i]->font);
130  av_freep(&m->ftab[i]);
131  }
132  }
133  av_freep(&m->ftab);
134 }
135 
137 {
138  uint8_t *tx3g_ptr = avctx->extradata;
139  int i, box_size, font_length;
140  int8_t v_align, h_align;
141  int style_fontID;
142  StyleBox s_default;
143 
144  m->count_f = 0;
145  m->ftab_entries = 0;
146  box_size = BOX_SIZE_INITIAL; /* Size till ftab_entries */
147  if (avctx->extradata_size < box_size)
148  return -1;
149 
150  // Display Flags
151  tx3g_ptr += 4;
152  // Alignment
153  h_align = *tx3g_ptr++;
154  v_align = *tx3g_ptr++;
155  if (h_align == 0) {
156  if (v_align == 0)
157  m->d.alignment = TOP_LEFT;
158  if (v_align == 1)
159  m->d.alignment = MIDDLE_LEFT;
160  if (v_align == -1)
161  m->d.alignment = BOTTOM_LEFT;
162  }
163  if (h_align == 1) {
164  if (v_align == 0)
165  m->d.alignment = TOP_CENTER;
166  if (v_align == 1)
168  if (v_align == -1)
170  }
171  if (h_align == -1) {
172  if (v_align == 0)
173  m->d.alignment = TOP_RIGHT;
174  if (v_align == 1)
175  m->d.alignment = MIDDLE_RIGHT;
176  if (v_align == -1)
177  m->d.alignment = BOTTOM_RIGHT;
178  }
179  // Background Color
180  m->d.back_color = AV_RB24(tx3g_ptr);
181  tx3g_ptr += 4;
182  // BoxRecord
183  tx3g_ptr += 8;
184  // StyleRecord
185  tx3g_ptr += 4;
186  // fontID
187  style_fontID = AV_RB16(tx3g_ptr);
188  tx3g_ptr += 2;
189  // face-style-flags
190  s_default.style_flag = *tx3g_ptr++;
191  m->d.bold = s_default.style_flag & STYLE_FLAG_BOLD;
192  m->d.italic = s_default.style_flag & STYLE_FLAG_ITALIC;
193  m->d.underline = s_default.style_flag & STYLE_FLAG_UNDERLINE;
194  // fontsize
195  m->d.fontsize = *tx3g_ptr++;
196  // Primary color
197  m->d.color = AV_RB24(tx3g_ptr);
198  tx3g_ptr += 4;
199  // FontRecord
200  // FontRecord Size
201  tx3g_ptr += 4;
202  // ftab
203  tx3g_ptr += 4;
204 
205  m->ftab_entries = AV_RB16(tx3g_ptr);
206  tx3g_ptr += 2;
207 
208  for (i = 0; i < m->ftab_entries; i++) {
209 
210  box_size += 3;
211  if (avctx->extradata_size < box_size) {
213  m->ftab_entries = 0;
214  return -1;
215  }
216  m->ftab_temp = av_mallocz(sizeof(*m->ftab_temp));
217  if (!m->ftab_temp) {
219  return AVERROR(ENOMEM);
220  }
221  m->ftab_temp->fontID = AV_RB16(tx3g_ptr);
222  tx3g_ptr += 2;
223  font_length = *tx3g_ptr++;
224 
225  box_size = box_size + font_length;
226  if (avctx->extradata_size < box_size) {
228  m->ftab_entries = 0;
229  return -1;
230  }
231  m->ftab_temp->font = av_malloc(font_length + 1);
232  if (!m->ftab_temp->font) {
234  return AVERROR(ENOMEM);
235  }
236  memcpy(m->ftab_temp->font, tx3g_ptr, font_length);
237  m->ftab_temp->font[font_length] = '\0';
238  av_dynarray_add(&m->ftab, &m->count_f, m->ftab_temp);
239  if (!m->ftab) {
241  return AVERROR(ENOMEM);
242  }
243  m->ftab_temp = NULL;
244  tx3g_ptr = tx3g_ptr + font_length;
245  }
246  for (i = 0; i < m->ftab_entries; i++) {
247  if (style_fontID == m->ftab[i]->fontID)
248  m->d.font = m->ftab[i]->font;
249  }
250  return 0;
251 }
252 
253 static int decode_twrp(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
254 {
255  m->box_flags |= TWRP_BOX;
256  m->w.wrap_flag = *tsmb++;
257  return 0;
258 }
259 
260 static int decode_hlit(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
261 {
262  m->box_flags |= HLIT_BOX;
263  m->h.hlit_start = AV_RB16(tsmb);
264  tsmb += 2;
265  m->h.hlit_end = AV_RB16(tsmb);
266  tsmb += 2;
267  return 0;
268 }
269 
270 static int decode_hclr(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
271 {
272  m->box_flags |= HCLR_BOX;
273  memcpy(m->c.hlit_color, tsmb, 4);
274  tsmb += 4;
275  return 0;
276 }
277 
278 static int decode_styl(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
279 {
280  int i;
281  m->style_entries = AV_RB16(tsmb);
282  tsmb += 2;
283  // A single style record is of length 12 bytes.
284  if (m->tracksize + m->size_var + 2 + m->style_entries * 12 > avpkt->size)
285  return -1;
286 
287  m->box_flags |= STYL_BOX;
288  for(i = 0; i < m->style_entries; i++) {
289  m->s_temp = av_malloc(sizeof(*m->s_temp));
290  if (!m->s_temp) {
291  mov_text_cleanup(m);
292  return AVERROR(ENOMEM);
293  }
294  m->s_temp->style_start = AV_RB16(tsmb);
295  tsmb += 2;
296  m->s_temp->style_end = AV_RB16(tsmb);
297  tsmb += 2;
298  m->s_temp->style_fontID = AV_RB16(tsmb);
299  tsmb += 2;
300  m->s_temp->style_flag = AV_RB8(tsmb);
301  tsmb++;
302  m->s_temp->fontsize = AV_RB8(tsmb);
303  av_dynarray_add(&m->s, &m->count_s, m->s_temp);
304  if(!m->s) {
305  mov_text_cleanup(m);
306  return AVERROR(ENOMEM);
307  }
308  tsmb++;
309  // text-color-rgba
310  tsmb += 4;
311  }
312  return 0;
313 }
314 
315 static const Box box_types[] = {
316  { MKBETAG('s','t','y','l'), 2, decode_styl },
317  { MKBETAG('h','l','i','t'), 4, decode_hlit },
318  { MKBETAG('h','c','l','r'), 4, decode_hclr },
319  { MKBETAG('t','w','r','p'), 1, decode_twrp }
320 };
321 
322 const static size_t box_count = FF_ARRAY_ELEMS(box_types);
323 
324 static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end,
325  MovTextContext *m)
326 {
327  int i = 0;
328  int j = 0;
329  int text_pos = 0;
330 
331  if (text < text_end && m->box_flags & TWRP_BOX) {
332  if (m->w.wrap_flag == 1) {
333  av_bprintf(buf, "{\\q1}"); /* End of line wrap */
334  } else {
335  av_bprintf(buf, "{\\q2}"); /* No wrap */
336  }
337  }
338 
339  while (text < text_end) {
340  if (m->box_flags & STYL_BOX) {
341  for (i = 0; i < m->style_entries; i++) {
342  if (m->s[i]->style_flag && text_pos == m->s[i]->style_end) {
343  av_bprintf(buf, "{\\r}");
344  }
345  }
346  for (i = 0; i < m->style_entries; i++) {
347  if (m->s[i]->style_flag && text_pos == m->s[i]->style_start) {
348  if (m->s[i]->style_flag & STYLE_FLAG_BOLD)
349  av_bprintf(buf, "{\\b1}");
350  if (m->s[i]->style_flag & STYLE_FLAG_ITALIC)
351  av_bprintf(buf, "{\\i1}");
352  if (m->s[i]->style_flag & STYLE_FLAG_UNDERLINE)
353  av_bprintf(buf, "{\\u1}");
354  av_bprintf(buf, "{\\fs%d}", m->s[i]->fontsize);
355  for (j = 0; j < m->ftab_entries; j++) {
356  if (m->s[i]->style_fontID == m->ftab[j]->fontID)
357  av_bprintf(buf, "{\\fn%s}", m->ftab[j]->font);
358  }
359  }
360  }
361  }
362  if (m->box_flags & HLIT_BOX) {
363  if (text_pos == m->h.hlit_start) {
364  /* If hclr box is present, set the secondary color to the color
365  * specified. Otherwise, set primary color to white and secondary
366  * color to black. These colors will come from TextSampleModifier
367  * boxes in future and inverse video technique for highlight will
368  * be implemented.
369  */
370  if (m->box_flags & HCLR_BOX) {
371  av_bprintf(buf, "{\\2c&H%02x%02x%02x&}", m->c.hlit_color[2],
372  m->c.hlit_color[1], m->c.hlit_color[0]);
373  } else {
374  av_bprintf(buf, "{\\1c&H000000&}{\\2c&HFFFFFF&}");
375  }
376  }
377  if (text_pos == m->h.hlit_end) {
378  if (m->box_flags & HCLR_BOX) {
379  av_bprintf(buf, "{\\2c&H000000&}");
380  } else {
381  av_bprintf(buf, "{\\1c&HFFFFFF&}{\\2c&H000000&}");
382  }
383  }
384  }
385 
386  switch (*text) {
387  case '\r':
388  break;
389  case '\n':
390  av_bprintf(buf, "\\N");
391  break;
392  default:
393  av_bprint_chars(buf, *text, 1);
394  break;
395  }
396  text++;
397  text_pos++;
398  }
399 
400  return 0;
401 }
402 
403 static int mov_text_init(AVCodecContext *avctx) {
404  /*
405  * TODO: Handle the default text style.
406  * NB: Most players ignore styles completely, with the result that
407  * it's very common to find files where the default style is broken
408  * and respecting it results in a worse experience than ignoring it.
409  */
410  int ret;
411  MovTextContext *m = avctx->priv_data;
412  ret = mov_text_tx3g(avctx, m);
413  if (ret == 0) {
414  return ff_ass_subtitle_header(avctx, m->d.font, m->d.fontsize, m->d.color,
415  m->d.back_color, m->d.bold, m->d.italic,
417  m->d.alignment);
418  } else
419  return ff_ass_subtitle_header_default(avctx);
420 }
421 
423  void *data, int *got_sub_ptr, AVPacket *avpkt)
424 {
425  AVSubtitle *sub = data;
426  MovTextContext *m = avctx->priv_data;
427  int ret, ts_start, ts_end;
428  AVBPrint buf;
429  char *ptr = avpkt->data;
430  char *end;
431  int text_length, tsmb_type, ret_tsmb;
432  uint64_t tsmb_size;
433  const uint8_t *tsmb;
434 
435  if (!ptr || avpkt->size < 2)
436  return AVERROR_INVALIDDATA;
437 
438  /*
439  * A packet of size two with value zero is an empty subtitle
440  * used to mark the end of the previous non-empty subtitle.
441  * We can just drop them here as we have duration information
442  * already. If the value is non-zero, then it's technically a
443  * bad packet.
444  */
445  if (avpkt->size == 2)
446  return AV_RB16(ptr) == 0 ? 0 : AVERROR_INVALIDDATA;
447 
448  /*
449  * The first two bytes of the packet are the length of the text string
450  * In complex cases, there are style descriptors appended to the string
451  * so we can't just assume the packet size is the string size.
452  */
453  text_length = AV_RB16(ptr);
454  end = ptr + FFMIN(2 + text_length, avpkt->size);
455  ptr += 2;
456 
457  ts_start = av_rescale_q(avpkt->pts,
458  avctx->time_base,
459  (AVRational){1,100});
460  ts_end = av_rescale_q(avpkt->pts + avpkt->duration,
461  avctx->time_base,
462  (AVRational){1,100});
463 
464  tsmb_size = 0;
465  m->tracksize = 2 + text_length;
466  m->style_entries = 0;
467  m->box_flags = 0;
468  m->count_s = 0;
469  // Note that the spec recommends lines be no longer than 2048 characters.
471  if (text_length + 2 != avpkt->size) {
472  while (m->tracksize + 8 <= avpkt->size) {
473  // A box is a minimum of 8 bytes.
474  tsmb = ptr + m->tracksize - 2;
475  tsmb_size = AV_RB32(tsmb);
476  tsmb += 4;
477  tsmb_type = AV_RB32(tsmb);
478  tsmb += 4;
479 
480  if (tsmb_size == 1) {
481  if (m->tracksize + 16 > avpkt->size)
482  break;
483  tsmb_size = AV_RB64(tsmb);
484  tsmb += 8;
485  m->size_var = 16;
486  } else
487  m->size_var = 8;
488  //size_var is equal to 8 or 16 depending on the size of box
489 
490  if (m->tracksize + tsmb_size > avpkt->size)
491  break;
492 
493  for (size_t i = 0; i < box_count; i++) {
494  if (tsmb_type == box_types[i].type) {
495  if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size)
496  break;
497  ret_tsmb = box_types[i].decode(tsmb, m, avpkt);
498  if (ret_tsmb == -1)
499  break;
500  }
501  }
502  m->tracksize = m->tracksize + tsmb_size;
503  }
504  text_to_ass(&buf, ptr, end, m);
506  } else
507  text_to_ass(&buf, ptr, end, m);
508 
509  ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_end - ts_start);
511  if (ret < 0)
512  return ret;
513  *got_sub_ptr = sub->num_rects > 0;
514  return avpkt->size;
515 }
516 
518 {
519  MovTextContext *m = avctx->priv_data;
521  return 0;
522 }
523 
525  .name = "mov_text",
526  .long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
527  .type = AVMEDIA_TYPE_SUBTITLE,
528  .id = AV_CODEC_ID_MOV_TEXT,
529  .priv_data_size = sizeof(MovTextContext),
530  .init = mov_text_init,
532  .close = mov_text_decode_close,
533 };
uint64_t tracksize
Definition: movtextdec.c:99
#define NULL
Definition: coverity.c:32
#define BOTTOM_RIGHT
Definition: movtextdec.c:43
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
HighlightBox h
Definition: movtextdec.c:91
static const size_t box_count
Definition: movtextdec.c:322
#define TOP_LEFT
Definition: movtextdec.c:47
static int decode_twrp(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
Definition: movtextdec.c:253
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
#define ASS_DEFAULT_BORDERSTYLE
Definition: ass.h:43
int(* decode)(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
Definition: movtextdec.c:107
memory handling functions
int ff_ass_subtitle_header(AVCodecContext *avctx, const char *font, int font_size, int color, int back_color, int bold, int italic, int underline, int border_style, int alignment)
Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
Definition: ass.c:29
char * font
Definition: movtextdec.c:64
uint8_t wrap_flag
Definition: movtextdec.c:85
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1468
uint16_t style_fontID
Definition: movtextdec.c:72
StyleBox * s_temp
Definition: movtextdec.c:90
FontRecord * ftab_temp
Definition: movtextdec.c:94
uint8_t hlit_color[4]
Definition: movtextdec.c:81
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
AVCodec.
Definition: avcodec.h:3392
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
uint16_t style_entries
Definition: movtextdec.c:98
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1661
uint8_t
#define av_malloc(s)
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS with default style.
Definition: ass.c:80
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1647
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
static int mov_text_init(AVCodecContext *avctx)
Definition: movtextdec.c:403
static void mov_text_cleanup(MovTextContext *m)
Definition: movtextdec.c:110
uint8_t * data
Definition: avcodec.h:1467
#define STYL_BOX
Definition: movtextdec.c:36
#define STYLE_FLAG_UNDERLINE
Definition: movtextdec.c:32
unsigned m
Definition: audioconvert.c:187
MovTextDefault d
Definition: movtextdec.c:96
uint16_t hlit_start
Definition: movtextdec.c:76
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
TextWrapBox w
Definition: movtextdec.c:95
#define AV_BPRINT_SIZE_UNLIMITED
uint8_t style_flag
Definition: movtextdec.c:70
#define AVERROR(e)
Definition: error.h:43
static const Box box_types[]
Definition: movtextdec.c:315
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
const char * name
Name of the codec implementation.
Definition: avcodec.h:3399
void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem)
Add an element to a dynamic array.
Definition: mem.c:324
#define TWRP_BOX
Definition: movtextdec.c:39
#define STYLE_FLAG_ITALIC
Definition: movtextdec.c:31
uint8_t box_flags
Definition: movtextdec.c:97
#define HLIT_BOX
Definition: movtextdec.c:37
#define FFMIN(a, b)
Definition: common.h:96
uint16_t hlit_end
Definition: movtextdec.c:77
uint32_t type
Definition: movtextdec.c:105
uint16_t style_start
Definition: movtextdec.c:68
#define FF_ARRAY_ELEMS(a)
static int decode_hlit(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
Definition: movtextdec.c:260
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_WB16 unsigned int_TMPL AV_RB8
Definition: bytestream.h:87
#define TOP_RIGHT
Definition: movtextdec.c:49
HilightcolorBox c
Definition: movtextdec.c:92
Libavcodec external API header.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:87
uint16_t ftab_entries
Definition: movtextdec.c:98
uint16_t style_end
Definition: movtextdec.c:69
int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf, int ts_start, int duration)
Same as ff_ass_add_rect, but taking an AVBPrint buffer instead of a string, and assuming raw=0...
Definition: ass.c:181
main external API structure.
Definition: avcodec.h:1532
void * buf
Definition: avisynth_c.h:553
GLint GLenum type
Definition: opengl_enc.c:105
#define BOTTOM_CENTER
Definition: movtextdec.c:42
int extradata_size
Definition: avcodec.h:1648
size_t base_size
Definition: movtextdec.c:106
rational number numerator/denominator
Definition: rational.h:43
StyleBox ** s
Definition: movtextdec.c:89
#define BOX_SIZE_INITIAL
Definition: movtextdec.c:34
static int decode_hclr(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
Definition: movtextdec.c:270
#define STYLE_FLAG_BOLD
Definition: movtextdec.c:30
#define MIDDLE_CENTER
Definition: movtextdec.c:45
uint16_t fontID
Definition: movtextdec.c:63
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:572
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:87
#define BOTTOM_LEFT
Definition: movtextdec.c:41
common internal and external API header
static int decode_styl(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
Definition: movtextdec.c:278
uint8_t fontsize
Definition: movtextdec.c:71
static int mov_text_decode_close(AVCodecContext *avctx)
Definition: movtextdec.c:517
AVCodec ff_movtext_decoder
Definition: movtextdec.c:524
#define MKBETAG(a, b, c, d)
Definition: common.h:343
void * priv_data
Definition: avcodec.h:1574
static void mov_text_cleanup_ftab(MovTextContext *m)
Definition: movtextdec.c:121
#define HCLR_BOX
Definition: movtextdec.c:38
#define av_freep(p)
#define MIDDLE_RIGHT
Definition: movtextdec.c:46
#define MIDDLE_LEFT
Definition: movtextdec.c:44
FontRecord ** ftab
Definition: movtextdec.c:93
#define TOP_CENTER
Definition: movtextdec.c:48
static int mov_text_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: movtextdec.c:422
This structure stores compressed data.
Definition: avcodec.h:1444
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1460
static int mov_text_tx3g(AVCodecContext *avctx, MovTextContext *m)
Definition: movtextdec.c:136
static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end, MovTextContext *m)
Definition: movtextdec.c:324
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140