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libzvbi-teletextdec.c
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1 /*
2  * Teletext decoding for ffmpeg
3  * Copyright (c) 2005-2010, 2012 Wolfram Gloger
4  * Copyright (c) 2013 Marton Balint
5  *
6  * This library 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 of the License, or (at your option) any later version.
10  *
11  * This library 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 this library; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avcodec.h"
22 #include "libavcodec/ass.h"
23 #include "libavcodec/dvbtxt.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/log.h"
29 #include "libavutil/common.h"
30 
31 #include <libzvbi.h>
32 
33 #define TEXT_MAXSZ (25 * (56 + 1) * 4 + 2)
34 #define VBI_NB_COLORS 40
35 #define VBI_TRANSPARENT_BLACK 8
36 #define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
37 #define VBI_R(rgba) (((rgba) >> 0) & 0xFF)
38 #define VBI_G(rgba) (((rgba) >> 8) & 0xFF)
39 #define VBI_B(rgba) (((rgba) >> 16) & 0xFF)
40 #define VBI_A(rgba) (((rgba) >> 24) & 0xFF)
41 #define MAX_BUFFERED_PAGES 25
42 #define BITMAP_CHAR_WIDTH 12
43 #define BITMAP_CHAR_HEIGHT 10
44 #define MAX_SLICES 64
45 
46 typedef struct TeletextPage
47 {
49  int pgno;
50  int subno;
51  int64_t pts;
52 } TeletextPage;
53 
54 typedef struct TeletextContext
55 {
56  AVClass *class;
57  char *pgno;
58  int x_offset;
59  int y_offset;
60  int format_id; /* 0 = bitmap, 1 = text/ass, 2 = ass */
61  int chop_top;
62  int sub_duration; /* in msec */
64  int opacity;
66 
69  int nb_pages;
70  int64_t pts;
72 
73  vbi_decoder * vbi;
74  vbi_sliced sliced[MAX_SLICES];
75 
76  int readorder;
78  int last_pgno;
79  int last_p5;
82 
84 {
85  int ret = ff_ass_subtitle_header_default(avctx);
86  char *new_header;
87  uint8_t *event_pos;
88 
89  if (ret < 0)
90  return ret;
91 
92  event_pos = strstr(avctx->subtitle_header, "\r\n[Events]\r\n");
93  if (!event_pos)
94  return AVERROR_BUG;
95 
96  new_header = av_asprintf("%.*s%s%s",
97  (int)(event_pos - avctx->subtitle_header), avctx->subtitle_header,
98  "Style: "
99  "Teletext," /* Name */
100  "Monospace,11," /* Font{name,size} */
101  "&Hffffff,&Hffffff,&H0,&H0," /* {Primary,Secondary,Outline,Back}Colour */
102  "0,0,0,0," /* Bold, Italic, Underline, StrikeOut */
103  "160,100," /* Scale{X,Y} */
104  "0,0," /* Spacing, Angle */
105  "3,0.1,0," /* BorderStyle, Outline, Shadow */
106  "5,1,1,1," /* Alignment, Margin[LRV] */
107  "0\r\n" /* Encoding */
108  "Style: "
109  "Subtitle," /* Name */
110  "Monospace,16," /* Font{name,size} */
111  "&Hffffff,&Hffffff,&H0,&H0," /* {Primary,Secondary,Outline,Back}Colour */
112  "0,0,0,0," /* Bold, Italic, Underline, StrikeOut */
113  "100,100," /* Scale{X,Y} */
114  "0,0," /* Spacing, Angle */
115  "1,1,1," /* BorderStyle, Outline, Shadow */
116  "8,48,48,20," /* Alignment, Margin[LRV] */
117  "0\r\n" /* Encoding */
118  , event_pos);
119 
120  if (!new_header)
121  return AVERROR(ENOMEM);
122 
123  av_free(avctx->subtitle_header);
124  avctx->subtitle_header = new_header;
125  avctx->subtitle_header_size = strlen(new_header);
126  return 0;
127 }
128 
129 static int chop_spaces_utf8(const unsigned char* t, int len)
130 {
131  t += len;
132  while (len > 0) {
133  if (*--t != ' ' || (len-1 > 0 && *(t-1) & 0x80))
134  break;
135  --len;
136  }
137  return len;
138 }
139 
140 static void subtitle_rect_free(AVSubtitleRect **sub_rect)
141 {
142  av_freep(&(*sub_rect)->data[0]);
143  av_freep(&(*sub_rect)->data[1]);
144  av_freep(&(*sub_rect)->ass);
145  av_freep(sub_rect);
146 }
147 
148 static char *create_ass_text(TeletextContext *ctx, const char *text)
149 {
150  char *dialog;
151  AVBPrint buf;
152 
154  ff_ass_bprint_text_event(&buf, text, strlen(text), "", 0);
155  if (!av_bprint_is_complete(&buf)) {
156  av_bprint_finalize(&buf, NULL);
157  return NULL;
158  }
159  dialog = ff_ass_get_dialog(ctx->readorder++, 0, NULL, NULL, buf.str);
160  av_bprint_finalize(&buf, NULL);
161  return dialog;
162 }
163 
164 /* Draw a page as text */
165 static int gen_sub_text(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
166 {
167  const char *in;
168  AVBPrint buf;
169  char *vbi_text = av_malloc(TEXT_MAXSZ);
170  int sz;
171 
172  if (!vbi_text)
173  return AVERROR(ENOMEM);
174 
175  sz = vbi_print_page_region(page, vbi_text, TEXT_MAXSZ-1, "UTF-8",
176  /*table mode*/ TRUE, FALSE,
177  0, chop_top,
178  page->columns, page->rows-chop_top);
179  if (sz <= 0) {
180  av_log(ctx, AV_LOG_ERROR, "vbi_print error\n");
181  av_free(vbi_text);
182  return AVERROR_EXTERNAL;
183  }
184  vbi_text[sz] = '\0';
185  in = vbi_text;
186  av_bprint_init(&buf, 0, TEXT_MAXSZ);
187 
188  if (ctx->chop_spaces) {
189  for (;;) {
190  int nl, sz;
191 
192  // skip leading spaces and newlines
193  in += strspn(in, " \n");
194  // compute end of row
195  for (nl = 0; in[nl]; ++nl)
196  if (in[nl] == '\n' && (nl==0 || !(in[nl-1] & 0x80)))
197  break;
198  if (!in[nl])
199  break;
200  // skip trailing spaces
201  sz = chop_spaces_utf8(in, nl);
202  av_bprint_append_data(&buf, in, sz);
203  av_bprintf(&buf, "\n");
204  in += nl;
205  }
206  } else {
207  av_bprintf(&buf, "%s\n", vbi_text);
208  }
209  av_free(vbi_text);
210 
211  if (!av_bprint_is_complete(&buf)) {
212  av_bprint_finalize(&buf, NULL);
213  return AVERROR(ENOMEM);
214  }
215 
216  if (buf.len) {
217  sub_rect->type = SUBTITLE_ASS;
218  sub_rect->ass = create_ass_text(ctx, buf.str);
219 
220  if (!sub_rect->ass) {
221  av_bprint_finalize(&buf, NULL);
222  return AVERROR(ENOMEM);
223  }
224  av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
225  } else {
226  sub_rect->type = SUBTITLE_NONE;
227  }
228  av_bprint_finalize(&buf, NULL);
229  return 0;
230 }
231 
232 static void bprint_color(const char *type, AVBPrint *buf, vbi_page *page, unsigned ci)
233 {
234  int r = VBI_R(page->color_map[ci]);
235  int g = VBI_G(page->color_map[ci]);
236  int b = VBI_B(page->color_map[ci]);
237  av_bprintf(buf, "{\\%s&H%02X%02X%02X&}", type, b, g, r);
238 }
239 
240 #define IS_TXT_SPACE(ch) ((ch).unicode < 0x0020 || (ch).unicode >= 0xe000 || (ch).unicode == 0x00a0 ||\
241  (ch).size > VBI_DOUBLE_SIZE || (ch).opacity == VBI_TRANSPARENT_SPACE)
242 
243 static void get_trim_info(vbi_page *page, vbi_char *row, int *leading, int *trailing, int *olen)
244 {
245  int i, len = 0;
246  int char_seen = 0;
247 
248  *leading = 0;
249 
250  for (i = 0; i < page->columns; i++) {
251  uint16_t out = IS_TXT_SPACE(row[i]) ? 32 : row[i].unicode;
252 
253  if (out == 32 && !char_seen)
254  (*leading)++;
255  else if (out != 32)
256  char_seen = 1, len = i - (*leading) + 1;
257  }
258 
259  *olen = len;
260  *trailing = len > 0 ? page->columns - *leading - len : page->columns;
261 }
262 
263 static void decode_string(vbi_page *page, vbi_char *row, AVBPrint *buf,
264  int start, int end, vbi_color *cur_color, vbi_color *cur_back_color)
265 {
266  int i;
267 
268  for (i = start; i < end; i++) {
269  uint16_t out = IS_TXT_SPACE(row[i]) ? 32 : row[i].unicode;
270 
271  if (*cur_color != row[i].foreground) {
272  bprint_color("c", buf, page, row[i].foreground);
273  *cur_color = row[i].foreground;
274  }
275  if (*cur_back_color != row[i].background) {
276  bprint_color("3c", buf, page, row[i].background);
277  *cur_back_color = row[i].background;
278  }
279 
280  if (out == 32) {
281  av_bprintf(buf, "\\h");
282  } else if (out == '\\' || out == '{' || out == '}') {
283  av_bprintf(buf, "\\%c", (char)out);
284  } else {
285  char tmp;
286  /* convert to utf-8 */
287  PUT_UTF8(out, tmp, av_bprint_chars(buf, tmp, 1););
288  }
289  }
290 }
291 
292 /* Draw a page as ass formatted text */
293 static int gen_sub_ass(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
294 {
295  int i;
296  int leading, trailing, len;
297  int last_trailing = -1, last_leading = -1;
298  int min_trailing = page->columns, min_leading = page->columns;
299  int alignment = 2;
300  int vertical_align = -1;
301  int can_align_left = 1, can_align_right = 1, can_align_center = 1;
302  int is_subtitle_page = ctx->subtitle_map[page->pgno & 0x7ff];
303  int empty_lines = 0;
304  vbi_color cur_color = VBI_WHITE;
305  vbi_color cur_back_color = VBI_BLACK;
306  AVBPrint buf;
307 
309 
310  for (i = chop_top; i < page->rows; i++) {
311  vbi_char *row = page->text + i * page->columns;
312 
313  get_trim_info(page, row, &leading, &trailing, &len);
314 
315  if (len) {
316  if (last_leading != -1 && last_leading != leading || leading > 5)
317  can_align_left = 0;
318  if (last_trailing != -1 && last_trailing != trailing || trailing > 2)
319  can_align_right = 0;
320  if (last_trailing != -1 && (FFABS((trailing - leading) - (last_trailing - last_leading)) > 1) || trailing - leading > 4)
321  can_align_center = 0;
322  last_leading = leading;
323  last_trailing = trailing;
324  min_leading = FFMIN(leading, min_leading);
325  min_trailing = FFMIN(trailing, min_trailing);
326  }
327  }
328 
329  if (!can_align_right && can_align_left && !can_align_center) {
330  ctx->last_ass_alignment = alignment = 1;
331  } else if (!can_align_right && !can_align_left && can_align_center) {
332  ctx->last_ass_alignment = alignment = 2;
333  } else if (can_align_right && !can_align_left && !can_align_center) {
334  ctx->last_ass_alignment = alignment = 3;
335  } else {
336  if (ctx->last_ass_alignment == 1 && can_align_left ||
337  ctx->last_ass_alignment == 2 && can_align_center ||
338  ctx->last_ass_alignment == 3 && can_align_right)
339  alignment = ctx->last_ass_alignment;
340  }
341 
342  for (i = chop_top; i < page->rows; i++) {
343  int j;
344  vbi_char *row = page->text + i * page->columns;
345  int is_transparent_line;
346 
347  for (j = 0; j < page->columns; j++)
348  if (row[j].opacity != VBI_TRANSPARENT_SPACE)
349  break;
350  is_transparent_line = (j == page->columns);
351 
352  len = is_transparent_line ? 0 : page->columns;
353  leading = trailing = is_transparent_line ? page->columns : 0;
354 
355  if (is_subtitle_page) {
356  if (!is_transparent_line)
357  get_trim_info(page, row, &leading, &trailing, &len);
358 
359  if (vertical_align == -1 && len) {
360  vertical_align = (2 - (av_clip(i + 1, 0, 23) / 8));
361  av_bprintf(&buf, "{\\an%d}", alignment + vertical_align * 3);
362  if (vertical_align != 2)
363  empty_lines = 0;
364  }
365 
366  if (len && empty_lines > 1)
367  for (empty_lines /= 2; empty_lines > 0; empty_lines--)
368  av_bprintf(&buf, " \\N");
369 
370  if (alignment == 1 || alignment == 2 && !can_align_center)
371  leading = min_leading;
372  if (alignment == 3 || alignment == 2 && !can_align_center)
373  trailing = min_trailing;
374  }
375 
376  if (len || !is_subtitle_page) {
377  decode_string(page, row, &buf, leading, page->columns - trailing, &cur_color, &cur_back_color);
378  av_bprintf(&buf, " \\N");
379  empty_lines = 0;
380  } else {
381  empty_lines++;
382  }
383  }
384 
385  if (vertical_align == 0)
386  for (empty_lines = (empty_lines - 1) / 2; empty_lines > 0; empty_lines--)
387  av_bprintf(&buf, " \\N");
388 
389  if (!av_bprint_is_complete(&buf)) {
390  av_bprint_finalize(&buf, NULL);
391  return AVERROR(ENOMEM);
392  }
393 
394  if (buf.len) {
395  sub_rect->type = SUBTITLE_ASS;
396  sub_rect->ass = ff_ass_get_dialog(ctx->readorder++, 0, is_subtitle_page ? "Subtitle" : "Teletext", NULL, buf.str);
397 
398  if (!sub_rect->ass) {
399  av_bprint_finalize(&buf, NULL);
400  return AVERROR(ENOMEM);
401  }
402  av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
403  } else {
404  sub_rect->type = SUBTITLE_NONE;
405  }
406  av_bprint_finalize(&buf, NULL);
407  return 0;
408 }
409 
410 static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page,
411  int chop_top, int resx, int resy)
412 {
413  int iy;
414 
415  // Hack for transparency, inspired by VLC code...
416  for (iy = 0; iy < resy; iy++) {
417  uint8_t *pixel = sub_rect->data[0] + iy * sub_rect->linesize[0];
418  vbi_char *vc = page->text + (iy / BITMAP_CHAR_HEIGHT + chop_top) * page->columns;
419  vbi_char *vcnext = vc + page->columns;
420  for (; vc < vcnext; vc++) {
421  uint8_t *pixelnext = pixel + BITMAP_CHAR_WIDTH;
422  switch (vc->opacity) {
423  case VBI_TRANSPARENT_SPACE:
424  memset(pixel, VBI_TRANSPARENT_BLACK, BITMAP_CHAR_WIDTH);
425  break;
426  case VBI_OPAQUE:
427  if (!ctx->transparent_bg)
428  break;
429  case VBI_SEMI_TRANSPARENT:
430  if (ctx->opacity > 0) {
431  if (ctx->opacity < 255)
432  for(; pixel < pixelnext; pixel++)
433  if (*pixel == vc->background)
434  *pixel += VBI_NB_COLORS;
435  break;
436  }
437  case VBI_TRANSPARENT_FULL:
438  for(; pixel < pixelnext; pixel++)
439  if (*pixel == vc->background)
440  *pixel = VBI_TRANSPARENT_BLACK;
441  break;
442  }
443  pixel = pixelnext;
444  }
445  }
446 }
447 
448 /* Draw a page as bitmap */
449 static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
450 {
451  int resx = page->columns * BITMAP_CHAR_WIDTH;
452  int resy = (page->rows - chop_top) * BITMAP_CHAR_HEIGHT;
453  uint8_t ci;
454  vbi_char *vc = page->text + (chop_top * page->columns);
455  vbi_char *vcend = page->text + (page->rows * page->columns);
456 
457  for (; vc < vcend; vc++) {
458  if (vc->opacity != VBI_TRANSPARENT_SPACE)
459  break;
460  }
461 
462  if (vc >= vcend) {
463  av_log(ctx, AV_LOG_DEBUG, "dropping empty page %3x\n", page->pgno);
464  sub_rect->type = SUBTITLE_NONE;
465  return 0;
466  }
467 
468  sub_rect->data[0] = av_mallocz(resx * resy);
469  sub_rect->linesize[0] = resx;
470  if (!sub_rect->data[0])
471  return AVERROR(ENOMEM);
472 
473  vbi_draw_vt_page_region(page, VBI_PIXFMT_PAL8,
474  sub_rect->data[0], sub_rect->linesize[0],
475  0, chop_top, page->columns, page->rows - chop_top,
476  /*reveal*/ 1, /*flash*/ 1);
477 
478  fix_transparency(ctx, sub_rect, page, chop_top, resx, resy);
479  sub_rect->x = ctx->x_offset;
480  sub_rect->y = ctx->y_offset + chop_top * BITMAP_CHAR_HEIGHT;
481  sub_rect->w = resx;
482  sub_rect->h = resy;
483  sub_rect->nb_colors = ctx->opacity > 0 && ctx->opacity < 255 ? 2 * VBI_NB_COLORS : VBI_NB_COLORS;
484  sub_rect->data[1] = av_mallocz(AVPALETTE_SIZE);
485  if (!sub_rect->data[1]) {
486  av_freep(&sub_rect->data[0]);
487  return AVERROR(ENOMEM);
488  }
489  for (ci = 0; ci < VBI_NB_COLORS; ci++) {
490  int r, g, b, a;
491 
492  r = VBI_R(page->color_map[ci]);
493  g = VBI_G(page->color_map[ci]);
494  b = VBI_B(page->color_map[ci]);
495  a = VBI_A(page->color_map[ci]);
496  ((uint32_t *)sub_rect->data[1])[ci] = RGBA(r, g, b, a);
497  ((uint32_t *)sub_rect->data[1])[ci + VBI_NB_COLORS] = RGBA(r, g, b, ctx->opacity);
498  ff_dlog(ctx, "palette %0x\n", ((uint32_t *)sub_rect->data[1])[ci]);
499  }
500  ((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK] = RGBA(0, 0, 0, 0);
501  ((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK + VBI_NB_COLORS] = RGBA(0, 0, 0, 0);
502  sub_rect->type = SUBTITLE_BITMAP;
503  return 0;
504 }
505 
506 static void handler(vbi_event *ev, void *user_data)
507 {
509  TeletextPage *new_pages;
510  vbi_page page;
511  int res;
512  char pgno_str[12];
513  int chop_top;
514  int is_subtitle_page = ctx->subtitle_map[ev->ev.ttx_page.pgno & 0x7ff];
515 
516  snprintf(pgno_str, sizeof pgno_str, "%03x", ev->ev.ttx_page.pgno);
517  av_log(ctx, AV_LOG_DEBUG, "decoded page %s.%02x\n",
518  pgno_str, ev->ev.ttx_page.subno & 0xFF);
519 
520  if (strcmp(ctx->pgno, "*") && (strcmp(ctx->pgno, "subtitle") || !is_subtitle_page) && !strstr(ctx->pgno, pgno_str))
521  return;
522  if (ctx->handler_ret < 0)
523  return;
524 
525  res = vbi_fetch_vt_page(ctx->vbi, &page,
526  ev->ev.ttx_page.pgno,
527  ev->ev.ttx_page.subno,
528  VBI_WST_LEVEL_3p5, 25, TRUE);
529 
530  if (!res)
531  return;
532 
533  chop_top = ctx->chop_top || ((page.rows > 1) && is_subtitle_page);
534 
535  av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
536  page.columns, page.rows, chop_top);
537 
538  if (ctx->nb_pages < MAX_BUFFERED_PAGES) {
539  if ((new_pages = av_realloc_array(ctx->pages, ctx->nb_pages + 1, sizeof(TeletextPage)))) {
540  TeletextPage *cur_page = new_pages + ctx->nb_pages;
541  ctx->pages = new_pages;
542  cur_page->sub_rect = av_mallocz(sizeof(*cur_page->sub_rect));
543  cur_page->pts = ctx->pts;
544  cur_page->pgno = ev->ev.ttx_page.pgno;
545  cur_page->subno = ev->ev.ttx_page.subno;
546  if (cur_page->sub_rect) {
547  switch (ctx->format_id) {
548  case 0:
549  res = gen_sub_bitmap(ctx, cur_page->sub_rect, &page, chop_top);
550  break;
551  case 1:
552  res = gen_sub_text(ctx, cur_page->sub_rect, &page, chop_top);
553  break;
554  case 2:
555  res = gen_sub_ass(ctx, cur_page->sub_rect, &page, chop_top);
556  break;
557  default:
558  res = AVERROR_BUG;
559  break;
560  }
561  if (res < 0) {
562  av_freep(&cur_page->sub_rect);
563  ctx->handler_ret = res;
564  } else {
565  ctx->pages[ctx->nb_pages++] = *cur_page;
566  }
567  } else {
568  ctx->handler_ret = AVERROR(ENOMEM);
569  }
570  } else {
571  ctx->handler_ret = AVERROR(ENOMEM);
572  }
573  } else {
574  //TODO: If multiple packets contain more than one page, pages may got queued up, and this may happen...
575  av_log(ctx, AV_LOG_ERROR, "Buffered too many pages, dropping page %s.\n", pgno_str);
576  ctx->handler_ret = AVERROR(ENOSYS);
577  }
578 
579  vbi_unref_page(&page);
580 }
581 
583 {
584  int lines = 0;
585  while (size >= 2 && lines < MAX_SLICES) {
586  int data_unit_id = buf[0];
587  int data_unit_length = buf[1];
588  if (data_unit_length + 2 > size)
589  return AVERROR_INVALIDDATA;
590  if (ff_data_unit_id_is_teletext(data_unit_id)) {
591  if (data_unit_length != 0x2c)
592  return AVERROR_INVALIDDATA;
593  else {
594  int line_offset = buf[2] & 0x1f;
595  int field_parity = buf[2] & 0x20;
596  uint8_t *p = ctx->sliced[lines].data;
597  int i, pmag;
598  ctx->sliced[lines].id = VBI_SLICED_TELETEXT_B;
599  ctx->sliced[lines].line = (line_offset > 0 ? (line_offset + (field_parity ? 0 : 313)) : 0);
600  for (i = 0; i < 42; i++)
601  p[i] = vbi_rev8(buf[4 + i]);
602  /* Unfortunately libzvbi does not expose page flags, and
603  * vbi_classify_page only checks MIP, so we have to manually
604  * decode the page flags and store the results. */
605  pmag = vbi_unham16p(p);
606  if (pmag >= 0 && pmag >> 3 == 0) { // We found a row 0 header
607  int page = vbi_unham16p(p + 2);
608  int flags1 = vbi_unham16p(p + 6);
609  int flags2 = vbi_unham16p(p + 8);
610  if (page >= 0 && flags1 >= 0 && flags2 >= 0) {
611  int pgno = ((pmag & 7) << 8) + page;
612  // Check for disabled NEWSFLASH flag and enabled SUBTITLE and SUPRESS_HEADER flags
613  ctx->subtitle_map[pgno] = (!(flags1 & 0x40) && flags1 & 0x80 && flags2 & 0x01);
614  // Propagate ERASE_PAGE flag for repeated page headers to work around a libzvbi bug
615  if (ctx->subtitle_map[pgno] && pgno == ctx->last_pgno) {
616  int last_byte9 = vbi_unham8(ctx->last_p5);
617  if (last_byte9 >= 0 && last_byte9 & 0x8) {
618  int byte9 = vbi_unham8(p[5]);
619  if (byte9 >= 0)
620  p[5] = vbi_ham8(byte9 | 0x8);
621  }
622  }
623  ctx->last_pgno = pgno;
624  ctx->last_p5 = p[5];
625  }
626  }
627  lines++;
628  }
629  }
630  size -= data_unit_length + 2;
631  buf += data_unit_length + 2;
632  }
633  if (size)
634  av_log(ctx, AV_LOG_WARNING, "%d bytes remained after slicing data\n", size);
635  return lines;
636 }
637 
638 static int teletext_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *pkt)
639 {
640  TeletextContext *ctx = avctx->priv_data;
641  AVSubtitle *sub = data;
642  int ret = 0;
643  int j;
644 
645  if (!ctx->vbi) {
646  if (!(ctx->vbi = vbi_decoder_new()))
647  return AVERROR(ENOMEM);
648  if (!vbi_event_handler_register(ctx->vbi, VBI_EVENT_TTX_PAGE, handler, ctx)) {
649  vbi_decoder_delete(ctx->vbi);
650  ctx->vbi = NULL;
651  return AVERROR(ENOMEM);
652  }
653  }
654 
655  if (avctx->pkt_timebase.num && pkt->pts != AV_NOPTS_VALUE)
656  ctx->pts = av_rescale_q(pkt->pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
657 
658  if (pkt->size) {
659  int lines;
660  const int full_pes_size = pkt->size + 45; /* PES header is 45 bytes */
661 
662  // We allow unreasonably big packets, even if the standard only allows a max size of 1472
663  if (full_pes_size < 184 || full_pes_size > 65504 || full_pes_size % 184 != 0)
664  return AVERROR_INVALIDDATA;
665 
666  ctx->handler_ret = pkt->size;
667 
669  if ((lines = slice_to_vbi_lines(ctx, pkt->data + 1, pkt->size - 1)) < 0)
670  return lines;
671  ff_dlog(avctx, "ctx=%p buf_size=%d lines=%u pkt_pts=%7.3f\n",
672  ctx, pkt->size, lines, (double)pkt->pts/90000.0);
673  if (lines > 0) {
674  vbi_decode(ctx->vbi, ctx->sliced, lines, 0.0);
675  ctx->lines_processed += lines;
676  }
677  }
678  ctx->pts = AV_NOPTS_VALUE;
679  ret = ctx->handler_ret;
680  }
681 
682  if (ret < 0)
683  return ret;
684 
685  // is there a subtitle to pass?
686  if (ctx->nb_pages) {
687  int i;
688  sub->format = !!ctx->format_id;
689  sub->start_display_time = 0;
690  sub->end_display_time = ctx->sub_duration;
691  sub->num_rects = 0;
692  sub->pts = ctx->pages->pts;
693 
694  if (ctx->pages->sub_rect->type != SUBTITLE_NONE) {
695  sub->rects = av_malloc(sizeof(*sub->rects));
696  if (sub->rects) {
697  sub->num_rects = 1;
698  sub->rects[0] = ctx->pages->sub_rect;
699 #if FF_API_AVPICTURE
701  for (j = 0; j < 4; j++) {
702  sub->rects[0]->pict.data[j] = sub->rects[0]->data[j];
703  sub->rects[0]->pict.linesize[j] = sub->rects[0]->linesize[j];
704  }
706 #endif
707  } else {
708  ret = AVERROR(ENOMEM);
709  }
710  } else {
711  av_log(avctx, AV_LOG_DEBUG, "sending empty sub\n");
712  sub->rects = NULL;
713  }
714  if (!sub->rects) // no rect was passed
716 
717  for (i = 0; i < ctx->nb_pages - 1; i++)
718  ctx->pages[i] = ctx->pages[i + 1];
719  ctx->nb_pages--;
720 
721  if (ret >= 0)
722  *data_size = 1;
723  } else
724  *data_size = 0;
725 
726  return ret;
727 }
728 
730 {
731  TeletextContext *ctx = avctx->priv_data;
732  unsigned int maj, min, rev;
733 
734  vbi_version(&maj, &min, &rev);
735  if (!(maj > 0 || min > 2 || min == 2 && rev >= 26)) {
736  av_log(avctx, AV_LOG_ERROR, "decoder needs zvbi version >= 0.2.26.\n");
737  return AVERROR_EXTERNAL;
738  }
739 
740  if (ctx->format_id == 0) {
741  avctx->width = 41 * BITMAP_CHAR_WIDTH;
742  avctx->height = 25 * BITMAP_CHAR_HEIGHT;
743  }
744 
745  ctx->vbi = NULL;
746  ctx->pts = AV_NOPTS_VALUE;
747  ctx->last_pgno = -1;
748  ctx->last_ass_alignment = 2;
749 
750  if (ctx->opacity == -1)
751  ctx->opacity = ctx->transparent_bg ? 0 : 255;
752 
753  av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
754 
755  switch (ctx->format_id) {
756  case 0:
757  return 0;
758  case 1:
759  return ff_ass_subtitle_header_default(avctx);
760  case 2:
761  return my_ass_subtitle_header(avctx);
762  }
763  return AVERROR_BUG;
764 }
765 
767 {
768  TeletextContext *ctx = avctx->priv_data;
769 
770  ff_dlog(avctx, "lines_total=%u\n", ctx->lines_processed);
771  while (ctx->nb_pages)
772  subtitle_rect_free(&ctx->pages[--ctx->nb_pages].sub_rect);
773  av_freep(&ctx->pages);
774 
775  vbi_decoder_delete(ctx->vbi);
776  ctx->vbi = NULL;
777  ctx->pts = AV_NOPTS_VALUE;
778  ctx->last_pgno = -1;
779  ctx->last_ass_alignment = 2;
780  memset(ctx->subtitle_map, 0, sizeof(ctx->subtitle_map));
781  if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
782  ctx->readorder = 0;
783  return 0;
784 }
785 
786 static void teletext_flush(AVCodecContext *avctx)
787 {
788  teletext_close_decoder(avctx);
789 }
790 
791 #define OFFSET(x) offsetof(TeletextContext, x)
792 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
793 static const AVOption options[] = {
794  {"txt_page", "page numbers to decode, subtitle for subtitles, * for all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, SD},
795  {"txt_chop_top", "discards the top teletext line", OFFSET(chop_top), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
796  {"txt_format", "format of the subtitles (bitmap or text or ass)", OFFSET(format_id), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 2, SD, "txt_format"},
797  {"bitmap", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, SD, "txt_format"},
798  {"text", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, SD, "txt_format"},
799  {"ass", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, SD, "txt_format"},
800  {"txt_left", "x offset of generated bitmaps", OFFSET(x_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
801  {"txt_top", "y offset of generated bitmaps", OFFSET(y_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
802  {"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
803  {"txt_duration", "display duration of teletext pages in msecs", OFFSET(sub_duration), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 86400000, SD},
804  {"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
805  {"txt_opacity", "set opacity of the transparent background", OFFSET(opacity), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, SD},
806  { NULL },
807 };
808 
809 static const AVClass teletext_class = {
810  .class_name = "libzvbi_teletextdec",
811  .item_name = av_default_item_name,
812  .option = options,
813  .version = LIBAVUTIL_VERSION_INT,
814 };
815 
817  .name = "libzvbi_teletextdec",
818  .long_name = NULL_IF_CONFIG_SMALL("Libzvbi DVB teletext decoder"),
819  .type = AVMEDIA_TYPE_SUBTITLE,
821  .priv_data_size = sizeof(TeletextContext),
823  .close = teletext_close_decoder,
825  .capabilities = AV_CODEC_CAP_DELAY,
827  .priv_class= &teletext_class,
828  .wrapper_name = "libzvbi",
829 };
static av_always_inline int ff_data_identifier_is_teletext(int data_identifier)
Definition: dvbtxt.h:28
static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top, int resx, int resy)
#define NULL
Definition: coverity.c:32
static int gen_sub_text(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
#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
static int my_ass_subtitle_header(AVCodecContext *avctx)
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3859
AVOption.
Definition: opt.h:246
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
static av_always_inline int ff_data_unit_id_is_teletext(int data_unit_id)
Definition: dvbtxt.h:36
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define VBI_NB_COLORS
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char * g
Definition: vf_curves.c:115
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define VBI_A(rgba)
#define TEXT_MAXSZ
int num
Numerator.
Definition: rational.h:59
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3863
int size
Definition: avcodec.h:1453
const char * b
Definition: vf_curves.c:116
static char * create_ass_text(TeletextContext *ctx, const char *text)
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
vbi_sliced sliced[MAX_SLICES]
static int chop_spaces_utf8(const unsigned char *t, int len)
unsigned num_rects
Definition: avcodec.h:3897
static void decode_string(vbi_page *page, vbi_char *row, AVBPrint *buf, int start, int end, vbi_color *cur_color, vbi_color *cur_back_color)
#define OFFSET(x)
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
#define PUT_UTF8(val, tmp, PUT_BYTE)
Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
Definition: common.h:438
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3441
#define MAX_SLICES
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
attribute_deprecated AVPicture pict
Definition: avcodec.h:3870
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
AVSubtitleRect ** rects
Definition: avcodec.h:3898
static int gen_sub_ass(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
static int slice_to_vbi_lines(TeletextContext *ctx, uint8_t *buf, int size)
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3861
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:72
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:993
uint8_t
#define av_malloc(s)
AVOptions.
int subtitle_header_size
Definition: avcodec.h:3019
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3830
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS with default style.
Definition: ass.c:80
static void handler(vbi_event *ev, void *user_data)
void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
Append data to a print buffer.
Definition: bprint.c:158
uint8_t * data
Definition: avcodec.h:1452
#define ff_dlog(a,...)
#define BITMAP_CHAR_HEIGHT
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
ptrdiff_t size
Definition: opengl_enc.c:101
#define MAX_BUFFERED_PAGES
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3862
#define AV_CODEC_FLAG2_RO_FLUSH_NOOP
Do not reset ASS ReadOrder field on flush (subtitles decoding)
Definition: avcodec.h:950
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:198
static void get_trim_info(vbi_page *page, vbi_char *row, int *leading, int *trailing, int *olen)
#define av_log(a,...)
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
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3087
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AV_BPRINT_SIZE_UNLIMITED
char * ff_ass_get_dialog(int readorder, int layer, const char *style, const char *speaker, const char *text)
Craft an ASS dialog string.
Definition: ass.c:93
#define SD
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3860
#define AVERROR(e)
Definition: error.h:43
#define FALSE
Definition: windows2linux.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
AVS_Value void * user_data
Definition: avisynth_c.h:699
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
const char * r
Definition: vf_curves.c:114
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
const char * name
Name of the codec implementation.
Definition: avcodec.h:3448
#define VBI_G(rgba)
uint8_t subtitle_map[2048]
#define BITMAP_CHAR_WIDTH
uint32_t end_display_time
Definition: avcodec.h:3896
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3899
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
AVCodec ff_libzvbi_teletext_decoder
common internal API header
A bitmap, pict will be set.
Definition: avcodec.h:3841
int linesize[4]
Definition: avcodec.h:3877
#define VBI_B(rgba)
#define FFMIN(a, b)
Definition: common.h:96
int width
picture width / height.
Definition: avcodec.h:1713
AVFormatContext * ctx
Definition: movenc.c:48
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3828
#define TRUE
Definition: windows2linux.h:33
uint16_t format
Definition: avcodec.h:3894
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
static void teletext_flush(AVCodecContext *avctx)
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
#define RGBA(r, g, b, a)
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3876
#define VBI_R(rgba)
static int teletext_close_decoder(AVCodecContext *avctx)
static void bprint_color(const char *type, AVBPrint *buf, vbi_page *page, unsigned ci)
Libavcodec external API header.
#define VBI_TRANSPARENT_BLACK
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
static const AVOption options[]
main external API structure.
Definition: avcodec.h:1540
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:690
GLint GLenum type
Definition: opengl_enc.c:105
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
Describe the class of an AVClass context structure.
Definition: log.h:67
static int teletext_init_decoder(AVCodecContext *avctx)
#define snprintf
Definition: snprintf.h:34
static int teletext_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *pkt)
uint8_t pixel
Definition: tiny_ssim.c:42
static const AVClass teletext_class
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal and external API header
if(ret< 0)
Definition: vf_mcdeint.c:279
uint32_t start_display_time
Definition: avcodec.h:3895
TeletextPage * pages
static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
void * priv_data
Definition: avcodec.h:1567
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:3853
#define av_free(p)
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
int len
void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size, const char *linebreaks, int keep_ass_markup)
Escape a text subtitle using ASS syntax into an AVBPrint buffer.
Definition: ass.c:131
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:3888
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1627
FILE * out
Definition: movenc.c:54
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:690
static void subtitle_rect_free(AVSubtitleRect **sub_rect)
#define IS_TXT_SPACE(ch)
enum AVSubtitleType type
Definition: avcodec.h:3879
float min
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
This structure stores compressed data.
Definition: avcodec.h:1429
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1445
AVSubtitleRect * sub_rect
for(j=16;j >0;--j)
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:3018
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140
static uint8_t tmp[11]
Definition: aes_ctr.c:26