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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 "libavutil/opt.h"
24 #include "libavutil/bprint.h"
25 #include "libavutil/internal.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/log.h"
28 
29 #include <libzvbi.h>
30 
31 #define TEXT_MAXSZ (25 * (56 + 1) * 4 + 2)
32 #define VBI_NB_COLORS 40
33 #define VBI_TRANSPARENT_BLACK 8
34 #define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
35 #define VBI_R(rgba) (((rgba) >> 0) & 0xFF)
36 #define VBI_G(rgba) (((rgba) >> 8) & 0xFF)
37 #define VBI_B(rgba) (((rgba) >> 16) & 0xFF)
38 #define VBI_A(rgba) (((rgba) >> 24) & 0xFF)
39 #define MAX_BUFFERED_PAGES 25
40 #define BITMAP_CHAR_WIDTH 12
41 #define BITMAP_CHAR_HEIGHT 10
42 #define MAX_SLICES 64
43 
44 typedef struct TeletextPage
45 {
47  int pgno;
48  int subno;
49  int64_t pts;
50 } TeletextPage;
51 
52 typedef struct TeletextContext
53 {
54  AVClass *class;
55  char *pgno;
56  int x_offset;
57  int y_offset;
58  int format_id; /* 0 = bitmap, 1 = text/ass */
59  int chop_top;
60  int sub_duration; /* in msec */
62  int opacity;
64 
67  int nb_pages;
68  int64_t pts;
70 
71  vbi_decoder * vbi;
72 #ifdef DEBUG
73  vbi_export * ex;
74 #endif
75  vbi_sliced sliced[MAX_SLICES];
77 
78 static int chop_spaces_utf8(const unsigned char* t, int len)
79 {
80  t += len;
81  while (len > 0) {
82  if (*--t != ' ' || (len-1 > 0 && *(t-1) & 0x80))
83  break;
84  --len;
85  }
86  return len;
87 }
88 
89 static void subtitle_rect_free(AVSubtitleRect **sub_rect)
90 {
91  av_freep(&(*sub_rect)->data[0]);
92  av_freep(&(*sub_rect)->data[1]);
93  av_freep(&(*sub_rect)->ass);
94  av_freep(sub_rect);
95 }
96 
97 static int create_ass_text(TeletextContext *ctx, const char *text, char **ass)
98 {
99  int ret;
100  AVBPrint buf, buf2;
101  const int ts_start = av_rescale_q(ctx->pts, AV_TIME_BASE_Q, (AVRational){1, 100});
102  const int ts_duration = av_rescale_q(ctx->sub_duration, (AVRational){1, 1000}, (AVRational){1, 100});
103 
104  /* First we escape the plain text into buf. */
106  ff_ass_bprint_text_event(&buf, text, strlen(text), "", 0);
107  av_bprintf(&buf, "\r\n");
108 
109  if (!av_bprint_is_complete(&buf)) {
111  return AVERROR(ENOMEM);
112  }
113 
114  /* Then we create the ass dialog line in buf2 from the escaped text in buf. */
116  ff_ass_bprint_dialog(&buf2, buf.str, ts_start, ts_duration, 0);
118 
119  if (!av_bprint_is_complete(&buf2)) {
120  av_bprint_finalize(&buf2, NULL);
121  return AVERROR(ENOMEM);
122  }
123 
124  if ((ret = av_bprint_finalize(&buf2, ass)) < 0)
125  return ret;
126 
127  return 0;
128 }
129 
130 /* Draw a page as text */
131 static int gen_sub_text(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
132 {
133  const char *in;
134  AVBPrint buf;
135  char *vbi_text = av_malloc(TEXT_MAXSZ);
136  int sz;
137 
138  if (!vbi_text)
139  return AVERROR(ENOMEM);
140 
141  sz = vbi_print_page_region(page, vbi_text, TEXT_MAXSZ-1, "UTF-8",
142  /*table mode*/ TRUE, FALSE,
143  0, chop_top,
144  page->columns, page->rows-chop_top);
145  if (sz <= 0) {
146  av_log(ctx, AV_LOG_ERROR, "vbi_print error\n");
147  av_free(vbi_text);
148  return AVERROR_EXTERNAL;
149  }
150  vbi_text[sz] = '\0';
151  in = vbi_text;
152  av_bprint_init(&buf, 0, TEXT_MAXSZ);
153 
154  if (ctx->chop_spaces) {
155  for (;;) {
156  int nl, sz;
157 
158  // skip leading spaces and newlines
159  in += strspn(in, " \n");
160  // compute end of row
161  for (nl = 0; in[nl]; ++nl)
162  if (in[nl] == '\n' && (nl==0 || !(in[nl-1] & 0x80)))
163  break;
164  if (!in[nl])
165  break;
166  // skip trailing spaces
167  sz = chop_spaces_utf8(in, nl);
168  av_bprint_append_data(&buf, in, sz);
169  av_bprintf(&buf, "\n");
170  in += nl;
171  }
172  } else {
173  av_bprintf(&buf, "%s\n", vbi_text);
174  }
175  av_free(vbi_text);
176 
177  if (!av_bprint_is_complete(&buf)) {
178  av_bprint_finalize(&buf, NULL);
179  return AVERROR(ENOMEM);
180  }
181 
182  if (buf.len) {
183  int ret;
184  sub_rect->type = SUBTITLE_ASS;
185  if ((ret = create_ass_text(ctx, buf.str, &sub_rect->ass)) < 0) {
186  av_bprint_finalize(&buf, NULL);
187  return ret;
188  }
189  av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
190  } else {
191  sub_rect->type = SUBTITLE_NONE;
192  }
193  av_bprint_finalize(&buf, NULL);
194  return 0;
195 }
196 
197 static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page,
198  int chop_top, int resx, int resy)
199 {
200  int iy;
201 
202  // Hack for transparency, inspired by VLC code...
203  for (iy = 0; iy < resy; iy++) {
204  uint8_t *pixel = sub_rect->data[0] + iy * sub_rect->linesize[0];
205  vbi_char *vc = page->text + (iy / BITMAP_CHAR_HEIGHT + chop_top) * page->columns;
206  vbi_char *vcnext = vc + page->columns;
207  for (; vc < vcnext; vc++) {
208  uint8_t *pixelnext = pixel + BITMAP_CHAR_WIDTH;
209  switch (vc->opacity) {
210  case VBI_TRANSPARENT_SPACE:
211  memset(pixel, VBI_TRANSPARENT_BLACK, BITMAP_CHAR_WIDTH);
212  break;
213  case VBI_OPAQUE:
214  if (!ctx->transparent_bg)
215  break;
216  case VBI_SEMI_TRANSPARENT:
217  if (ctx->opacity > 0) {
218  if (ctx->opacity < 255)
219  for(; pixel < pixelnext; pixel++)
220  if (*pixel == vc->background)
221  *pixel += VBI_NB_COLORS;
222  break;
223  }
224  case VBI_TRANSPARENT_FULL:
225  for(; pixel < pixelnext; pixel++)
226  if (*pixel == vc->background)
227  *pixel = VBI_TRANSPARENT_BLACK;
228  break;
229  }
230  pixel = pixelnext;
231  }
232  }
233 }
234 
235 /* Draw a page as bitmap */
236 static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
237 {
238  int resx = page->columns * BITMAP_CHAR_WIDTH;
239  int resy = (page->rows - chop_top) * BITMAP_CHAR_HEIGHT;
240  uint8_t ci;
241  vbi_char *vc = page->text + (chop_top * page->columns);
242  vbi_char *vcend = page->text + (page->rows * page->columns);
243 
244  for (; vc < vcend; vc++) {
245  if (vc->opacity != VBI_TRANSPARENT_SPACE)
246  break;
247  }
248 
249  if (vc >= vcend) {
250  av_log(ctx, AV_LOG_DEBUG, "dropping empty page %3x\n", page->pgno);
251  sub_rect->type = SUBTITLE_NONE;
252  return 0;
253  }
254 
255  sub_rect->data[0] = av_mallocz(resx * resy);
256  sub_rect->linesize[0] = resx;
257  if (!sub_rect->data[0])
258  return AVERROR(ENOMEM);
259 
260  vbi_draw_vt_page_region(page, VBI_PIXFMT_PAL8,
261  sub_rect->data[0], sub_rect->linesize[0],
262  0, chop_top, page->columns, page->rows - chop_top,
263  /*reveal*/ 1, /*flash*/ 1);
264 
265  fix_transparency(ctx, sub_rect, page, chop_top, resx, resy);
266  sub_rect->x = ctx->x_offset;
267  sub_rect->y = ctx->y_offset + chop_top * BITMAP_CHAR_HEIGHT;
268  sub_rect->w = resx;
269  sub_rect->h = resy;
270  sub_rect->nb_colors = ctx->opacity > 0 && ctx->opacity < 255 ? 2 * VBI_NB_COLORS : VBI_NB_COLORS;
271  sub_rect->data[1] = av_mallocz(AVPALETTE_SIZE);
272  if (!sub_rect->data[1]) {
273  av_freep(&sub_rect->data[0]);
274  return AVERROR(ENOMEM);
275  }
276  for (ci = 0; ci < VBI_NB_COLORS; ci++) {
277  int r, g, b, a;
278 
279  r = VBI_R(page->color_map[ci]);
280  g = VBI_G(page->color_map[ci]);
281  b = VBI_B(page->color_map[ci]);
282  a = VBI_A(page->color_map[ci]);
283  ((uint32_t *)sub_rect->data[1])[ci] = RGBA(r, g, b, a);
284  ((uint32_t *)sub_rect->data[1])[ci + VBI_NB_COLORS] = RGBA(r, g, b, ctx->opacity);
285  ff_dlog(ctx, "palette %0x\n", ((uint32_t *)sub_rect->data[1])[ci]);
286  }
287  ((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK] = RGBA(0, 0, 0, 0);
288  ((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK + VBI_NB_COLORS] = RGBA(0, 0, 0, 0);
289  sub_rect->type = SUBTITLE_BITMAP;
290  return 0;
291 }
292 
293 static void handler(vbi_event *ev, void *user_data)
294 {
296  TeletextPage *new_pages;
297  vbi_page page;
298  int res;
299  char pgno_str[12];
300  vbi_subno subno;
301  vbi_page_type vpt;
302  int chop_top;
303  char *lang;
304 
305  snprintf(pgno_str, sizeof pgno_str, "%03x", ev->ev.ttx_page.pgno);
306  av_log(ctx, AV_LOG_DEBUG, "decoded page %s.%02x\n",
307  pgno_str, ev->ev.ttx_page.subno & 0xFF);
308 
309  if (strcmp(ctx->pgno, "*") && !strstr(ctx->pgno, pgno_str))
310  return;
311  if (ctx->handler_ret < 0)
312  return;
313 
314  res = vbi_fetch_vt_page(ctx->vbi, &page,
315  ev->ev.ttx_page.pgno,
316  ev->ev.ttx_page.subno,
317  VBI_WST_LEVEL_3p5, 25, TRUE);
318 
319  if (!res)
320  return;
321 
322 #ifdef DEBUG
323  fprintf(stderr, "\nSaving res=%d dy0=%d dy1=%d...\n",
324  res, page.dirty.y0, page.dirty.y1);
325  fflush(stderr);
326 
327  if (!vbi_export_stdio(ctx->ex, stderr, &page))
328  fprintf(stderr, "failed: %s\n", vbi_export_errstr(ctx->ex));
329 #endif
330 
331  vpt = vbi_classify_page(ctx->vbi, ev->ev.ttx_page.pgno, &subno, &lang);
332  chop_top = ctx->chop_top ||
333  ((page.rows > 1) && (vpt == VBI_SUBTITLE_PAGE));
334 
335  av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
336  page.columns, page.rows, chop_top);
337 
338  if (ctx->nb_pages < MAX_BUFFERED_PAGES) {
339  if ((new_pages = av_realloc_array(ctx->pages, ctx->nb_pages + 1, sizeof(TeletextPage)))) {
340  TeletextPage *cur_page = new_pages + ctx->nb_pages;
341  ctx->pages = new_pages;
342  cur_page->sub_rect = av_mallocz(sizeof(*cur_page->sub_rect));
343  cur_page->pts = ctx->pts;
344  cur_page->pgno = ev->ev.ttx_page.pgno;
345  cur_page->subno = ev->ev.ttx_page.subno;
346  if (cur_page->sub_rect) {
347  res = (ctx->format_id == 0) ?
348  gen_sub_bitmap(ctx, cur_page->sub_rect, &page, chop_top) :
349  gen_sub_text (ctx, cur_page->sub_rect, &page, chop_top);
350  if (res < 0) {
351  av_freep(&cur_page->sub_rect);
352  ctx->handler_ret = res;
353  } else {
354  ctx->pages[ctx->nb_pages++] = *cur_page;
355  }
356  } else {
357  ctx->handler_ret = AVERROR(ENOMEM);
358  }
359  } else {
360  ctx->handler_ret = AVERROR(ENOMEM);
361  }
362  } else {
363  //TODO: If multiple packets contain more than one page, pages may got queued up, and this may happen...
364  av_log(ctx, AV_LOG_ERROR, "Buffered too many pages, dropping page %s.\n", pgno_str);
365  ctx->handler_ret = AVERROR(ENOSYS);
366  }
367 
368  vbi_unref_page(&page);
369 }
370 
371 static inline int data_identifier_is_teletext(int data_identifier) {
372  /* See EN 301 775 section 4.4.2. */
373  return (data_identifier >= 0x10 && data_identifier <= 0x1F ||
374  data_identifier >= 0x99 && data_identifier <= 0x9B);
375 }
376 
378 {
379  int lines = 0;
380  while (size >= 2 && lines < MAX_SLICES) {
381  int data_unit_id = buf[0];
382  int data_unit_length = buf[1];
383  if (data_unit_length + 2 > size)
384  return AVERROR_INVALIDDATA;
385  if (data_unit_id == 0x02 || data_unit_id == 0x03) {
386  if (data_unit_length != 0x2c)
387  return AVERROR_INVALIDDATA;
388  else {
389  int line_offset = buf[2] & 0x1f;
390  int field_parity = buf[2] & 0x20;
391  int i;
392  ctx->sliced[lines].id = VBI_SLICED_TELETEXT_B;
393  ctx->sliced[lines].line = (line_offset > 0 ? (line_offset + (field_parity ? 0 : 313)) : 0);
394  for (i = 0; i < 42; i++)
395  ctx->sliced[lines].data[i] = vbi_rev8(buf[4 + i]);
396  lines++;
397  }
398  }
399  size -= data_unit_length + 2;
400  buf += data_unit_length + 2;
401  }
402  if (size)
403  av_log(ctx, AV_LOG_WARNING, "%d bytes remained after slicing data\n", size);
404  return lines;
405 }
406 
407 static int teletext_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *pkt)
408 {
409  TeletextContext *ctx = avctx->priv_data;
410  AVSubtitle *sub = data;
411  int ret = 0;
412  int j;
413 
414  if (!ctx->vbi) {
415  if (!(ctx->vbi = vbi_decoder_new()))
416  return AVERROR(ENOMEM);
417  if (!vbi_event_handler_add(ctx->vbi, VBI_EVENT_TTX_PAGE, handler, ctx)) {
418  vbi_decoder_delete(ctx->vbi);
419  ctx->vbi = NULL;
420  return AVERROR(ENOMEM);
421  }
422  }
423 
424  if (avctx->pkt_timebase.num && pkt->pts != AV_NOPTS_VALUE)
425  ctx->pts = av_rescale_q(pkt->pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
426 
427  if (pkt->size) {
428  int lines;
429  const int full_pes_size = pkt->size + 45; /* PES header is 45 bytes */
430 
431  // We allow unreasonably big packets, even if the standard only allows a max size of 1472
432  if (full_pes_size < 184 || full_pes_size > 65504 || full_pes_size % 184 != 0)
433  return AVERROR_INVALIDDATA;
434 
435  ctx->handler_ret = pkt->size;
436 
437  if (data_identifier_is_teletext(*pkt->data)) {
438  if ((lines = slice_to_vbi_lines(ctx, pkt->data + 1, pkt->size - 1)) < 0)
439  return lines;
440  ff_dlog(avctx, "ctx=%p buf_size=%d lines=%u pkt_pts=%7.3f\n",
441  ctx, pkt->size, lines, (double)pkt->pts/90000.0);
442  if (lines > 0) {
443 #ifdef DEBUG
444  int i;
445  av_log(avctx, AV_LOG_DEBUG, "line numbers:");
446  for(i = 0; i < lines; i++)
447  av_log(avctx, AV_LOG_DEBUG, " %d", ctx->sliced[i].line);
448  av_log(avctx, AV_LOG_DEBUG, "\n");
449 #endif
450  vbi_decode(ctx->vbi, ctx->sliced, lines, 0.0);
451  ctx->lines_processed += lines;
452  }
453  }
454  ctx->pts = AV_NOPTS_VALUE;
455  ret = ctx->handler_ret;
456  }
457 
458  if (ret < 0)
459  return ret;
460 
461  // is there a subtitle to pass?
462  if (ctx->nb_pages) {
463  int i;
464  sub->format = ctx->format_id;
465  sub->start_display_time = 0;
466  sub->end_display_time = ctx->sub_duration;
467  sub->num_rects = 0;
468  sub->pts = ctx->pages->pts;
469 
470  if (ctx->pages->sub_rect->type != SUBTITLE_NONE) {
471  sub->rects = av_malloc(sizeof(*sub->rects));
472  if (sub->rects) {
473  sub->num_rects = 1;
474  sub->rects[0] = ctx->pages->sub_rect;
475 #if FF_API_AVPICTURE
477  for (j = 0; j < 4; j++) {
478  sub->rects[0]->pict.data[j] = sub->rects[0]->data[j];
479  sub->rects[0]->pict.linesize[j] = sub->rects[0]->linesize[j];
480  }
482 #endif
483  } else {
484  ret = AVERROR(ENOMEM);
485  }
486  } else {
487  av_log(avctx, AV_LOG_DEBUG, "sending empty sub\n");
488  sub->rects = NULL;
489  }
490  if (!sub->rects) // no rect was passed
492 
493  for (i = 0; i < ctx->nb_pages - 1; i++)
494  ctx->pages[i] = ctx->pages[i + 1];
495  ctx->nb_pages--;
496 
497  if (ret >= 0)
498  *data_size = 1;
499  } else
500  *data_size = 0;
501 
502  return ret;
503 }
504 
506 {
507  TeletextContext *ctx = avctx->priv_data;
508  unsigned int maj, min, rev;
509 
510  vbi_version(&maj, &min, &rev);
511  if (!(maj > 0 || min > 2 || min == 2 && rev >= 26)) {
512  av_log(avctx, AV_LOG_ERROR, "decoder needs zvbi version >= 0.2.26.\n");
513  return AVERROR_EXTERNAL;
514  }
515 
516  if (ctx->format_id == 0) {
517  avctx->width = 41 * BITMAP_CHAR_WIDTH;
518  avctx->height = 25 * BITMAP_CHAR_HEIGHT;
519  }
520 
521  ctx->vbi = NULL;
522  ctx->pts = AV_NOPTS_VALUE;
523 
524  if (ctx->opacity == -1)
525  ctx->opacity = ctx->transparent_bg ? 0 : 255;
526 
527 #ifdef DEBUG
528  {
529  char *t;
530  ctx->ex = vbi_export_new("text", &t);
531  }
532 #endif
533  av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
534  return (ctx->format_id == 1) ? ff_ass_subtitle_header_default(avctx) : 0;
535 }
536 
538 {
539  TeletextContext *ctx = avctx->priv_data;
540 
541  ff_dlog(avctx, "lines_total=%u\n", ctx->lines_processed);
542  while (ctx->nb_pages)
543  subtitle_rect_free(&ctx->pages[--ctx->nb_pages].sub_rect);
544  av_freep(&ctx->pages);
545 
546  vbi_decoder_delete(ctx->vbi);
547  ctx->vbi = NULL;
548  ctx->pts = AV_NOPTS_VALUE;
549  return 0;
550 }
551 
552 static void teletext_flush(AVCodecContext *avctx)
553 {
554  teletext_close_decoder(avctx);
555 }
556 
557 #define OFFSET(x) offsetof(TeletextContext, x)
558 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
559 static const AVOption options[] = {
560  {"txt_page", "list of teletext page numbers to decode, * is all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, SD},
561  {"txt_chop_top", "discards the top teletext line", OFFSET(chop_top), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
562  {"txt_format", "format of the subtitles (bitmap or text)", OFFSET(format_id), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD, "txt_format"},
563  {"bitmap", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, SD, "txt_format"},
564  {"text", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, SD, "txt_format"},
565  {"txt_left", "x offset of generated bitmaps", OFFSET(x_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
566  {"txt_top", "y offset of generated bitmaps", OFFSET(y_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
567  {"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
568  {"txt_duration", "display duration of teletext pages in msecs", OFFSET(sub_duration), AV_OPT_TYPE_INT, {.i64 = 30000}, 0, 86400000, SD},
569  {"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
570  {"txt_opacity", "set opacity of the transparent background", OFFSET(opacity), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, SD},
571  { NULL },
572 };
573 
574 static const AVClass teletext_class = {
575  .class_name = "libzvbi_teletextdec",
576  .item_name = av_default_item_name,
577  .option = options,
578  .version = LIBAVUTIL_VERSION_INT,
579 };
580 
582  .name = "libzvbi_teletextdec",
583  .long_name = NULL_IF_CONFIG_SMALL("Libzvbi DVB teletext decoder"),
584  .type = AVMEDIA_TYPE_SUBTITLE,
586  .priv_data_size = sizeof(TeletextContext),
588  .close = teletext_close_decoder,
590  .capabilities = AV_CODEC_CAP_DELAY,
592  .priv_class= &teletext_class,
593 };
static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top, int resx, int resy)
int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog, int ts_start, int duration, int raw)
Add an ASS dialog line to an AVBPrint buffer.
Definition: ass.c:107
#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
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3699
AVOption.
Definition: opt.h:245
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
AVFormatContext * ctx
Definition: movenc-test.c:48
#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:70
const char * g
Definition: vf_curves.c:108
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define VBI_A(rgba)
#define TEXT_MAXSZ
int num
numerator
Definition: rational.h:44
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3703
int size
Definition: avcodec.h:1468
const char * b
Definition: vf_curves.c:109
vbi_sliced sliced[MAX_SLICES]
static int chop_spaces_utf8(const unsigned char *t, int len)
unsigned num_rects
Definition: avcodec.h:3737
#define OFFSET(x)
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3392
#define MAX_SLICES
static int create_ass_text(TeletextContext *ctx, const char *text, char **ass)
attribute_deprecated AVPicture pict
Definition: avcodec.h:3710
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
AVSubtitleRect ** rects
Definition: avcodec.h:3738
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:3701
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:881
uint8_t
#define av_malloc(s)
AVOptions.
#define AVPALETTE_SIZE
Definition: pixfmt.h:33
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3670
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:1467
#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:3702
#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:3228
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AV_BPRINT_SIZE_UNLIMITED
#define SD
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3700
av_default_item_name
#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:176
AVS_Value void * user_data
Definition: avisynth_c.h:562
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
const char * r
Definition: vf_curves.c:107
#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:3399
#define VBI_G(rgba)
#define BITMAP_CHAR_WIDTH
uint32_t end_display_time
Definition: avcodec.h:3736
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3739
AVCodec ff_libzvbi_teletext_decoder
common internal API header
A bitmap, pict will be set.
Definition: avcodec.h:3681
int linesize[4]
Definition: avcodec.h:3717
#define VBI_B(rgba)
int width
picture width / height.
Definition: avcodec.h:1711
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3668
#define TRUE
Definition: windows2linux.h:33
uint16_t format
Definition: avcodec.h:3734
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:3716
#define VBI_R(rgba)
static int teletext_close_decoder(AVCodecContext *avctx)
Libavcodec external API header.
#define VBI_TRANSPARENT_BLACK
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:252
static const AVOption options[]
main external API structure.
Definition: avcodec.h:1532
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:553
Describe the class of an AVClass context structure.
Definition: log.h:67
static int teletext_init_decoder(AVCodecContext *avctx)
rational number numerator/denominator
Definition: rational.h:43
#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
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:572
static int data_identifier_is_teletext(int data_identifier)
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
if(ret< 0)
Definition: vf_mcdeint.c:282
uint32_t start_display_time
Definition: avcodec.h:3735
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:208
TeletextPage * pages
static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
void * priv_data
Definition: avcodec.h:1574
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:3693
#define av_free(p)
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
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:190
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:3728
#define av_freep(p)
static void subtitle_rect_free(AVSubtitleRect **sub_rect)
enum AVSubtitleType type
Definition: avcodec.h:3719
float min
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
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
AVSubtitleRect * sub_rect
for(j=16;j >0;--j)
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240