FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
movtextdec.c
Go to the documentation of this file.
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;
104 
105 typedef struct {
106  uint32_t type;
107  size_t base_size;
108  int (*decode)(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt);
109 } Box;
110 
112 {
113  int i;
114  if (m->box_flags & STYL_BOX) {
115  for(i = 0; i < m->count_s; i++) {
116  av_freep(&m->s[i]);
117  }
118  av_freep(&m->s);
119  }
120 }
121 
123 {
124  int i;
125  if (m->ftab_temp)
126  av_freep(&m->ftab_temp->font);
127  av_freep(&m->ftab_temp);
128  if (m->ftab) {
129  for(i = 0; i < m->count_f; i++) {
130  av_freep(&m->ftab[i]->font);
131  av_freep(&m->ftab[i]);
132  }
133  }
134  av_freep(&m->ftab);
135 }
136 
138 {
139  uint8_t *tx3g_ptr = avctx->extradata;
140  int i, box_size, font_length;
141  int8_t v_align, h_align;
142  int style_fontID;
143  StyleBox s_default;
144 
145  m->count_f = 0;
146  m->ftab_entries = 0;
147  box_size = BOX_SIZE_INITIAL; /* Size till ftab_entries */
148  if (avctx->extradata_size < box_size)
149  return -1;
150 
151  // Display Flags
152  tx3g_ptr += 4;
153  // Alignment
154  h_align = *tx3g_ptr++;
155  v_align = *tx3g_ptr++;
156  if (h_align == 0) {
157  if (v_align == 0)
158  m->d.alignment = TOP_LEFT;
159  if (v_align == 1)
160  m->d.alignment = MIDDLE_LEFT;
161  if (v_align == -1)
162  m->d.alignment = BOTTOM_LEFT;
163  }
164  if (h_align == 1) {
165  if (v_align == 0)
166  m->d.alignment = TOP_CENTER;
167  if (v_align == 1)
169  if (v_align == -1)
171  }
172  if (h_align == -1) {
173  if (v_align == 0)
174  m->d.alignment = TOP_RIGHT;
175  if (v_align == 1)
176  m->d.alignment = MIDDLE_RIGHT;
177  if (v_align == -1)
178  m->d.alignment = BOTTOM_RIGHT;
179  }
180  // Background Color
181  m->d.back_color = AV_RB24(tx3g_ptr);
182  tx3g_ptr += 4;
183  // BoxRecord
184  tx3g_ptr += 8;
185  // StyleRecord
186  tx3g_ptr += 4;
187  // fontID
188  style_fontID = AV_RB16(tx3g_ptr);
189  tx3g_ptr += 2;
190  // face-style-flags
191  s_default.style_flag = *tx3g_ptr++;
192  m->d.bold = s_default.style_flag & STYLE_FLAG_BOLD;
193  m->d.italic = s_default.style_flag & STYLE_FLAG_ITALIC;
194  m->d.underline = s_default.style_flag & STYLE_FLAG_UNDERLINE;
195  // fontsize
196  m->d.fontsize = *tx3g_ptr++;
197  // Primary color
198  m->d.color = AV_RB24(tx3g_ptr);
199  tx3g_ptr += 4;
200  // FontRecord
201  // FontRecord Size
202  tx3g_ptr += 4;
203  // ftab
204  tx3g_ptr += 4;
205 
206  m->ftab_entries = AV_RB16(tx3g_ptr);
207  tx3g_ptr += 2;
208 
209  for (i = 0; i < m->ftab_entries; i++) {
210 
211  box_size += 3;
212  if (avctx->extradata_size < box_size) {
214  m->ftab_entries = 0;
215  return -1;
216  }
217  m->ftab_temp = av_mallocz(sizeof(*m->ftab_temp));
218  if (!m->ftab_temp) {
220  return AVERROR(ENOMEM);
221  }
222  m->ftab_temp->fontID = AV_RB16(tx3g_ptr);
223  tx3g_ptr += 2;
224  font_length = *tx3g_ptr++;
225 
226  box_size = box_size + font_length;
227  if (avctx->extradata_size < box_size) {
229  m->ftab_entries = 0;
230  return -1;
231  }
232  m->ftab_temp->font = av_malloc(font_length + 1);
233  if (!m->ftab_temp->font) {
235  return AVERROR(ENOMEM);
236  }
237  memcpy(m->ftab_temp->font, tx3g_ptr, font_length);
238  m->ftab_temp->font[font_length] = '\0';
239  av_dynarray_add(&m->ftab, &m->count_f, m->ftab_temp);
240  if (!m->ftab) {
242  return AVERROR(ENOMEM);
243  }
244  m->ftab_temp = NULL;
245  tx3g_ptr = tx3g_ptr + font_length;
246  }
247  for (i = 0; i < m->ftab_entries; i++) {
248  if (style_fontID == m->ftab[i]->fontID)
249  m->d.font = m->ftab[i]->font;
250  }
251  return 0;
252 }
253 
254 static int decode_twrp(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
255 {
256  m->box_flags |= TWRP_BOX;
257  m->w.wrap_flag = *tsmb++;
258  return 0;
259 }
260 
261 static int decode_hlit(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
262 {
263  m->box_flags |= HLIT_BOX;
264  m->h.hlit_start = AV_RB16(tsmb);
265  tsmb += 2;
266  m->h.hlit_end = AV_RB16(tsmb);
267  tsmb += 2;
268  return 0;
269 }
270 
271 static int decode_hclr(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
272 {
273  m->box_flags |= HCLR_BOX;
274  memcpy(m->c.hlit_color, tsmb, 4);
275  tsmb += 4;
276  return 0;
277 }
278 
279 static int decode_styl(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
280 {
281  int i;
282  m->style_entries = AV_RB16(tsmb);
283  tsmb += 2;
284  // A single style record is of length 12 bytes.
285  if (m->tracksize + m->size_var + 2 + m->style_entries * 12 > avpkt->size)
286  return -1;
287 
288  m->box_flags |= STYL_BOX;
289  for(i = 0; i < m->style_entries; i++) {
290  m->s_temp = av_malloc(sizeof(*m->s_temp));
291  if (!m->s_temp) {
292  mov_text_cleanup(m);
293  return AVERROR(ENOMEM);
294  }
295  m->s_temp->style_start = AV_RB16(tsmb);
296  tsmb += 2;
297  m->s_temp->style_end = AV_RB16(tsmb);
298  tsmb += 2;
299  m->s_temp->style_fontID = AV_RB16(tsmb);
300  tsmb += 2;
301  m->s_temp->style_flag = AV_RB8(tsmb);
302  tsmb++;
303  m->s_temp->fontsize = AV_RB8(tsmb);
304  av_dynarray_add(&m->s, &m->count_s, m->s_temp);
305  if(!m->s) {
306  mov_text_cleanup(m);
307  return AVERROR(ENOMEM);
308  }
309  tsmb++;
310  // text-color-rgba
311  tsmb += 4;
312  }
313  return 0;
314 }
315 
316 static const Box box_types[] = {
317  { MKBETAG('s','t','y','l'), 2, decode_styl },
318  { MKBETAG('h','l','i','t'), 4, decode_hlit },
319  { MKBETAG('h','c','l','r'), 4, decode_hclr },
320  { MKBETAG('t','w','r','p'), 1, decode_twrp }
321 };
322 
323 const static size_t box_count = FF_ARRAY_ELEMS(box_types);
324 
325 static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end,
326  MovTextContext *m)
327 {
328  int i = 0;
329  int j = 0;
330  int text_pos = 0;
331 
332  if (text < text_end && m->box_flags & TWRP_BOX) {
333  if (m->w.wrap_flag == 1) {
334  av_bprintf(buf, "{\\q1}"); /* End of line wrap */
335  } else {
336  av_bprintf(buf, "{\\q2}"); /* No wrap */
337  }
338  }
339 
340  while (text < text_end) {
341  if (m->box_flags & STYL_BOX) {
342  for (i = 0; i < m->style_entries; i++) {
343  if (m->s[i]->style_flag && text_pos == m->s[i]->style_end) {
344  av_bprintf(buf, "{\\r}");
345  }
346  }
347  for (i = 0; i < m->style_entries; i++) {
348  if (m->s[i]->style_flag && text_pos == m->s[i]->style_start) {
349  if (m->s[i]->style_flag & STYLE_FLAG_BOLD)
350  av_bprintf(buf, "{\\b1}");
351  if (m->s[i]->style_flag & STYLE_FLAG_ITALIC)
352  av_bprintf(buf, "{\\i1}");
353  if (m->s[i]->style_flag & STYLE_FLAG_UNDERLINE)
354  av_bprintf(buf, "{\\u1}");
355  av_bprintf(buf, "{\\fs%d}", m->s[i]->fontsize);
356  for (j = 0; j < m->ftab_entries; j++) {
357  if (m->s[i]->style_fontID == m->ftab[j]->fontID)
358  av_bprintf(buf, "{\\fn%s}", m->ftab[j]->font);
359  }
360  }
361  }
362  }
363  if (m->box_flags & HLIT_BOX) {
364  if (text_pos == m->h.hlit_start) {
365  /* If hclr box is present, set the secondary color to the color
366  * specified. Otherwise, set primary color to white and secondary
367  * color to black. These colors will come from TextSampleModifier
368  * boxes in future and inverse video technique for highlight will
369  * be implemented.
370  */
371  if (m->box_flags & HCLR_BOX) {
372  av_bprintf(buf, "{\\2c&H%02x%02x%02x&}", m->c.hlit_color[2],
373  m->c.hlit_color[1], m->c.hlit_color[0]);
374  } else {
375  av_bprintf(buf, "{\\1c&H000000&}{\\2c&HFFFFFF&}");
376  }
377  }
378  if (text_pos == m->h.hlit_end) {
379  if (m->box_flags & HCLR_BOX) {
380  av_bprintf(buf, "{\\2c&H000000&}");
381  } else {
382  av_bprintf(buf, "{\\1c&HFFFFFF&}{\\2c&H000000&}");
383  }
384  }
385  }
386 
387  switch (*text) {
388  case '\r':
389  break;
390  case '\n':
391  av_bprintf(buf, "\\N");
392  break;
393  default:
394  av_bprint_chars(buf, *text, 1);
395  break;
396  }
397  text++;
398  text_pos++;
399  }
400 
401  return 0;
402 }
403 
404 static int mov_text_init(AVCodecContext *avctx) {
405  /*
406  * TODO: Handle the default text style.
407  * NB: Most players ignore styles completely, with the result that
408  * it's very common to find files where the default style is broken
409  * and respecting it results in a worse experience than ignoring it.
410  */
411  int ret;
412  MovTextContext *m = avctx->priv_data;
413  ret = mov_text_tx3g(avctx, m);
414  if (ret == 0) {
415  return ff_ass_subtitle_header(avctx, m->d.font, m->d.fontsize, m->d.color,
416  m->d.back_color, m->d.bold, m->d.italic,
418  m->d.alignment);
419  } else
420  return ff_ass_subtitle_header_default(avctx);
421 }
422 
424  void *data, int *got_sub_ptr, AVPacket *avpkt)
425 {
426  AVSubtitle *sub = data;
427  MovTextContext *m = avctx->priv_data;
428  int ret;
429  AVBPrint buf;
430  char *ptr = avpkt->data;
431  char *end;
432  int text_length, tsmb_type, ret_tsmb;
433  uint64_t tsmb_size;
434  const uint8_t *tsmb;
435 
436  if (!ptr || avpkt->size < 2)
437  return AVERROR_INVALIDDATA;
438 
439  /*
440  * A packet of size two with value zero is an empty subtitle
441  * used to mark the end of the previous non-empty subtitle.
442  * We can just drop them here as we have duration information
443  * already. If the value is non-zero, then it's technically a
444  * bad packet.
445  */
446  if (avpkt->size == 2)
447  return AV_RB16(ptr) == 0 ? 0 : AVERROR_INVALIDDATA;
448 
449  /*
450  * The first two bytes of the packet are the length of the text string
451  * In complex cases, there are style descriptors appended to the string
452  * so we can't just assume the packet size is the string size.
453  */
454  text_length = AV_RB16(ptr);
455  end = ptr + FFMIN(2 + text_length, avpkt->size);
456  ptr += 2;
457 
458  tsmb_size = 0;
459  m->tracksize = 2 + text_length;
460  m->style_entries = 0;
461  m->box_flags = 0;
462  m->count_s = 0;
463  // Note that the spec recommends lines be no longer than 2048 characters.
465  if (text_length + 2 != avpkt->size) {
466  while (m->tracksize + 8 <= avpkt->size) {
467  // A box is a minimum of 8 bytes.
468  tsmb = ptr + m->tracksize - 2;
469  tsmb_size = AV_RB32(tsmb);
470  tsmb += 4;
471  tsmb_type = AV_RB32(tsmb);
472  tsmb += 4;
473 
474  if (tsmb_size == 1) {
475  if (m->tracksize + 16 > avpkt->size)
476  break;
477  tsmb_size = AV_RB64(tsmb);
478  tsmb += 8;
479  m->size_var = 16;
480  } else
481  m->size_var = 8;
482  //size_var is equal to 8 or 16 depending on the size of box
483 
484  if (m->tracksize + tsmb_size > avpkt->size)
485  break;
486 
487  for (size_t i = 0; i < box_count; i++) {
488  if (tsmb_type == box_types[i].type) {
489  if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size)
490  break;
491  ret_tsmb = box_types[i].decode(tsmb, m, avpkt);
492  if (ret_tsmb == -1)
493  break;
494  }
495  }
496  m->tracksize = m->tracksize + tsmb_size;
497  }
498  text_to_ass(&buf, ptr, end, m);
499  mov_text_cleanup(m);
500  } else
501  text_to_ass(&buf, ptr, end, m);
502 
503  ret = ff_ass_add_rect(sub, buf.str, m->readorder++, 0, NULL, NULL);
504  av_bprint_finalize(&buf, NULL);
505  if (ret < 0)
506  return ret;
507  *got_sub_ptr = sub->num_rects > 0;
508  return avpkt->size;
509 }
510 
512 {
513  MovTextContext *m = avctx->priv_data;
515  return 0;
516 }
517 
518 static void mov_text_flush(AVCodecContext *avctx)
519 {
520  MovTextContext *m = avctx->priv_data;
521  if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
522  m->readorder = 0;
523 }
524 
526  .name = "mov_text",
527  .long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
528  .type = AVMEDIA_TYPE_SUBTITLE,
529  .id = AV_CODEC_ID_MOV_TEXT,
530  .priv_data_size = sizeof(MovTextContext),
531  .init = mov_text_init,
533  .close = mov_text_decode_close,
535 };
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:323
#define TOP_LEFT
Definition: movtextdec.c:47
static int decode_twrp(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
Definition: movtextdec.c:254
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
#define ASS_DEFAULT_BORDERSTYLE
Definition: ass.h:43
int(* decode)(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
Definition: movtextdec.c:108
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:1578
uint16_t style_fontID
Definition: movtextdec.c:72
StyleBox * s_temp
Definition: movtextdec.c:90
unsigned num_rects
Definition: avcodec.h:3895
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, int readorder, int layer, const char *style, const char *speaker)
Add an ASS dialog to a subtitle.
Definition: ass.c:101
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:3535
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
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:1757
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:404
static void mov_text_cleanup(MovTextContext *m)
Definition: movtextdec.c:111
uint8_t * data
Definition: avcodec.h:1577
#define STYL_BOX
Definition: movtextdec.c:36
#define AV_CODEC_FLAG2_RO_FLUSH_NOOP
Do not reset ASS ReadOrder field on flush (subtitles decoding)
Definition: avcodec.h:935
#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
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:316
#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:3542
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
static void mov_text_flush(AVCodecContext *avctx)
Definition: movtextdec.c:518
#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:106
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:261
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
main external API structure.
Definition: avcodec.h:1642
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:1758
size_t base_size
Definition: movtextdec.c:107
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:271
#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:722
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:279
uint8_t fontsize
Definition: movtextdec.c:71
static int mov_text_decode_close(AVCodecContext *avctx)
Definition: movtextdec.c:511
AVCodec ff_movtext_decoder
Definition: movtextdec.c:525
#define MKBETAG(a, b, c, d)
Definition: common.h:343
void * priv_data
Definition: avcodec.h:1684
static void mov_text_cleanup_ftab(MovTextContext *m)
Definition: movtextdec.c:122
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1744
#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:423
This structure stores compressed data.
Definition: avcodec.h:1554
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
static int mov_text_tx3g(AVCodecContext *avctx, MovTextContext *m)
Definition: movtextdec.c:137
static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end, MovTextContext *m)
Definition: movtextdec.c:325
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140