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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 
30 #include <libzvbi.h>
31 
32 #define TEXT_MAXSZ (25 * (56 + 1) * 4 + 2)
33 #define VBI_NB_COLORS 40
34 #define VBI_TRANSPARENT_BLACK 8
35 #define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
36 #define VBI_R(rgba) (((rgba) >> 0) & 0xFF)
37 #define VBI_G(rgba) (((rgba) >> 8) & 0xFF)
38 #define VBI_B(rgba) (((rgba) >> 16) & 0xFF)
39 #define VBI_A(rgba) (((rgba) >> 24) & 0xFF)
40 #define MAX_BUFFERED_PAGES 25
41 #define BITMAP_CHAR_WIDTH 12
42 #define BITMAP_CHAR_HEIGHT 10
43 #define MAX_SLICES 64
44 
45 typedef struct TeletextPage
46 {
48  int pgno;
49  int subno;
50  int64_t pts;
51 } TeletextPage;
52 
53 typedef struct TeletextContext
54 {
55  AVClass *class;
56  char *pgno;
57  int x_offset;
58  int y_offset;
59  int format_id; /* 0 = bitmap, 1 = text/ass */
60  int chop_top;
61  int sub_duration; /* in msec */
63  int opacity;
65 
68  int nb_pages;
69  int64_t pts;
71 
72  vbi_decoder * vbi;
73 #ifdef DEBUG
74  vbi_export * ex;
75 #endif
76  vbi_sliced sliced[MAX_SLICES];
77 
78  int readorder;
80 
81 static int chop_spaces_utf8(const unsigned char* t, int len)
82 {
83  t += len;
84  while (len > 0) {
85  if (*--t != ' ' || (len-1 > 0 && *(t-1) & 0x80))
86  break;
87  --len;
88  }
89  return len;
90 }
91 
92 static void subtitle_rect_free(AVSubtitleRect **sub_rect)
93 {
94  av_freep(&(*sub_rect)->data[0]);
95  av_freep(&(*sub_rect)->data[1]);
96  av_freep(&(*sub_rect)->ass);
97  av_freep(sub_rect);
98 }
99 
100 static char *create_ass_text(TeletextContext *ctx, const char *text)
101 {
102  char *dialog;
103  AVBPrint buf;
104 
106  ff_ass_bprint_text_event(&buf, text, strlen(text), "", 0);
107  if (!av_bprint_is_complete(&buf)) {
108  av_bprint_finalize(&buf, NULL);
109  return NULL;
110  }
111  dialog = ff_ass_get_dialog(ctx->readorder++, 0, NULL, NULL, buf.str);
112  av_bprint_finalize(&buf, NULL);
113  return dialog;
114 }
115 
116 /* Draw a page as text */
117 static int gen_sub_text(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
118 {
119  const char *in;
120  AVBPrint buf;
121  char *vbi_text = av_malloc(TEXT_MAXSZ);
122  int sz;
123 
124  if (!vbi_text)
125  return AVERROR(ENOMEM);
126 
127  sz = vbi_print_page_region(page, vbi_text, TEXT_MAXSZ-1, "UTF-8",
128  /*table mode*/ TRUE, FALSE,
129  0, chop_top,
130  page->columns, page->rows-chop_top);
131  if (sz <= 0) {
132  av_log(ctx, AV_LOG_ERROR, "vbi_print error\n");
133  av_free(vbi_text);
134  return AVERROR_EXTERNAL;
135  }
136  vbi_text[sz] = '\0';
137  in = vbi_text;
138  av_bprint_init(&buf, 0, TEXT_MAXSZ);
139 
140  if (ctx->chop_spaces) {
141  for (;;) {
142  int nl, sz;
143 
144  // skip leading spaces and newlines
145  in += strspn(in, " \n");
146  // compute end of row
147  for (nl = 0; in[nl]; ++nl)
148  if (in[nl] == '\n' && (nl==0 || !(in[nl-1] & 0x80)))
149  break;
150  if (!in[nl])
151  break;
152  // skip trailing spaces
153  sz = chop_spaces_utf8(in, nl);
154  av_bprint_append_data(&buf, in, sz);
155  av_bprintf(&buf, "\n");
156  in += nl;
157  }
158  } else {
159  av_bprintf(&buf, "%s\n", vbi_text);
160  }
161  av_free(vbi_text);
162 
163  if (!av_bprint_is_complete(&buf)) {
164  av_bprint_finalize(&buf, NULL);
165  return AVERROR(ENOMEM);
166  }
167 
168  if (buf.len) {
169  sub_rect->type = SUBTITLE_ASS;
170  sub_rect->ass = create_ass_text(ctx, buf.str);
171 
172  if (!sub_rect->ass) {
173  av_bprint_finalize(&buf, NULL);
174  return AVERROR(ENOMEM);
175  }
176  av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
177  } else {
178  sub_rect->type = SUBTITLE_NONE;
179  }
180  av_bprint_finalize(&buf, NULL);
181  return 0;
182 }
183 
184 static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page,
185  int chop_top, int resx, int resy)
186 {
187  int iy;
188 
189  // Hack for transparency, inspired by VLC code...
190  for (iy = 0; iy < resy; iy++) {
191  uint8_t *pixel = sub_rect->data[0] + iy * sub_rect->linesize[0];
192  vbi_char *vc = page->text + (iy / BITMAP_CHAR_HEIGHT + chop_top) * page->columns;
193  vbi_char *vcnext = vc + page->columns;
194  for (; vc < vcnext; vc++) {
195  uint8_t *pixelnext = pixel + BITMAP_CHAR_WIDTH;
196  switch (vc->opacity) {
197  case VBI_TRANSPARENT_SPACE:
198  memset(pixel, VBI_TRANSPARENT_BLACK, BITMAP_CHAR_WIDTH);
199  break;
200  case VBI_OPAQUE:
201  if (!ctx->transparent_bg)
202  break;
203  case VBI_SEMI_TRANSPARENT:
204  if (ctx->opacity > 0) {
205  if (ctx->opacity < 255)
206  for(; pixel < pixelnext; pixel++)
207  if (*pixel == vc->background)
208  *pixel += VBI_NB_COLORS;
209  break;
210  }
211  case VBI_TRANSPARENT_FULL:
212  for(; pixel < pixelnext; pixel++)
213  if (*pixel == vc->background)
214  *pixel = VBI_TRANSPARENT_BLACK;
215  break;
216  }
217  pixel = pixelnext;
218  }
219  }
220 }
221 
222 /* Draw a page as bitmap */
223 static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
224 {
225  int resx = page->columns * BITMAP_CHAR_WIDTH;
226  int resy = (page->rows - chop_top) * BITMAP_CHAR_HEIGHT;
227  uint8_t ci;
228  vbi_char *vc = page->text + (chop_top * page->columns);
229  vbi_char *vcend = page->text + (page->rows * page->columns);
230 
231  for (; vc < vcend; vc++) {
232  if (vc->opacity != VBI_TRANSPARENT_SPACE)
233  break;
234  }
235 
236  if (vc >= vcend) {
237  av_log(ctx, AV_LOG_DEBUG, "dropping empty page %3x\n", page->pgno);
238  sub_rect->type = SUBTITLE_NONE;
239  return 0;
240  }
241 
242  sub_rect->data[0] = av_mallocz(resx * resy);
243  sub_rect->linesize[0] = resx;
244  if (!sub_rect->data[0])
245  return AVERROR(ENOMEM);
246 
247  vbi_draw_vt_page_region(page, VBI_PIXFMT_PAL8,
248  sub_rect->data[0], sub_rect->linesize[0],
249  0, chop_top, page->columns, page->rows - chop_top,
250  /*reveal*/ 1, /*flash*/ 1);
251 
252  fix_transparency(ctx, sub_rect, page, chop_top, resx, resy);
253  sub_rect->x = ctx->x_offset;
254  sub_rect->y = ctx->y_offset + chop_top * BITMAP_CHAR_HEIGHT;
255  sub_rect->w = resx;
256  sub_rect->h = resy;
257  sub_rect->nb_colors = ctx->opacity > 0 && ctx->opacity < 255 ? 2 * VBI_NB_COLORS : VBI_NB_COLORS;
258  sub_rect->data[1] = av_mallocz(AVPALETTE_SIZE);
259  if (!sub_rect->data[1]) {
260  av_freep(&sub_rect->data[0]);
261  return AVERROR(ENOMEM);
262  }
263  for (ci = 0; ci < VBI_NB_COLORS; ci++) {
264  int r, g, b, a;
265 
266  r = VBI_R(page->color_map[ci]);
267  g = VBI_G(page->color_map[ci]);
268  b = VBI_B(page->color_map[ci]);
269  a = VBI_A(page->color_map[ci]);
270  ((uint32_t *)sub_rect->data[1])[ci] = RGBA(r, g, b, a);
271  ((uint32_t *)sub_rect->data[1])[ci + VBI_NB_COLORS] = RGBA(r, g, b, ctx->opacity);
272  ff_dlog(ctx, "palette %0x\n", ((uint32_t *)sub_rect->data[1])[ci]);
273  }
274  ((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK] = RGBA(0, 0, 0, 0);
275  ((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK + VBI_NB_COLORS] = RGBA(0, 0, 0, 0);
276  sub_rect->type = SUBTITLE_BITMAP;
277  return 0;
278 }
279 
280 static void handler(vbi_event *ev, void *user_data)
281 {
283  TeletextPage *new_pages;
284  vbi_page page;
285  int res;
286  char pgno_str[12];
287  vbi_subno subno;
288  vbi_page_type vpt;
289  int chop_top;
290  char *lang;
291 
292  snprintf(pgno_str, sizeof pgno_str, "%03x", ev->ev.ttx_page.pgno);
293  av_log(ctx, AV_LOG_DEBUG, "decoded page %s.%02x\n",
294  pgno_str, ev->ev.ttx_page.subno & 0xFF);
295 
296  if (strcmp(ctx->pgno, "*") && !strstr(ctx->pgno, pgno_str))
297  return;
298  if (ctx->handler_ret < 0)
299  return;
300 
301  res = vbi_fetch_vt_page(ctx->vbi, &page,
302  ev->ev.ttx_page.pgno,
303  ev->ev.ttx_page.subno,
304  VBI_WST_LEVEL_3p5, 25, TRUE);
305 
306  if (!res)
307  return;
308 
309 #ifdef DEBUG
310  fprintf(stderr, "\nSaving res=%d dy0=%d dy1=%d...\n",
311  res, page.dirty.y0, page.dirty.y1);
312  fflush(stderr);
313 
314  if (!vbi_export_stdio(ctx->ex, stderr, &page))
315  fprintf(stderr, "failed: %s\n", vbi_export_errstr(ctx->ex));
316 #endif
317 
318  vpt = vbi_classify_page(ctx->vbi, ev->ev.ttx_page.pgno, &subno, &lang);
319  chop_top = ctx->chop_top ||
320  ((page.rows > 1) && (vpt == VBI_SUBTITLE_PAGE));
321 
322  av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
323  page.columns, page.rows, chop_top);
324 
325  if (ctx->nb_pages < MAX_BUFFERED_PAGES) {
326  if ((new_pages = av_realloc_array(ctx->pages, ctx->nb_pages + 1, sizeof(TeletextPage)))) {
327  TeletextPage *cur_page = new_pages + ctx->nb_pages;
328  ctx->pages = new_pages;
329  cur_page->sub_rect = av_mallocz(sizeof(*cur_page->sub_rect));
330  cur_page->pts = ctx->pts;
331  cur_page->pgno = ev->ev.ttx_page.pgno;
332  cur_page->subno = ev->ev.ttx_page.subno;
333  if (cur_page->sub_rect) {
334  res = (ctx->format_id == 0) ?
335  gen_sub_bitmap(ctx, cur_page->sub_rect, &page, chop_top) :
336  gen_sub_text (ctx, cur_page->sub_rect, &page, chop_top);
337  if (res < 0) {
338  av_freep(&cur_page->sub_rect);
339  ctx->handler_ret = res;
340  } else {
341  ctx->pages[ctx->nb_pages++] = *cur_page;
342  }
343  } else {
344  ctx->handler_ret = AVERROR(ENOMEM);
345  }
346  } else {
347  ctx->handler_ret = AVERROR(ENOMEM);
348  }
349  } else {
350  //TODO: If multiple packets contain more than one page, pages may got queued up, and this may happen...
351  av_log(ctx, AV_LOG_ERROR, "Buffered too many pages, dropping page %s.\n", pgno_str);
352  ctx->handler_ret = AVERROR(ENOSYS);
353  }
354 
355  vbi_unref_page(&page);
356 }
357 
359 {
360  int lines = 0;
361  while (size >= 2 && lines < MAX_SLICES) {
362  int data_unit_id = buf[0];
363  int data_unit_length = buf[1];
364  if (data_unit_length + 2 > size)
365  return AVERROR_INVALIDDATA;
366  if (ff_data_unit_id_is_teletext(data_unit_id)) {
367  if (data_unit_length != 0x2c)
368  return AVERROR_INVALIDDATA;
369  else {
370  int line_offset = buf[2] & 0x1f;
371  int field_parity = buf[2] & 0x20;
372  int i;
373  ctx->sliced[lines].id = VBI_SLICED_TELETEXT_B;
374  ctx->sliced[lines].line = (line_offset > 0 ? (line_offset + (field_parity ? 0 : 313)) : 0);
375  for (i = 0; i < 42; i++)
376  ctx->sliced[lines].data[i] = vbi_rev8(buf[4 + i]);
377  lines++;
378  }
379  }
380  size -= data_unit_length + 2;
381  buf += data_unit_length + 2;
382  }
383  if (size)
384  av_log(ctx, AV_LOG_WARNING, "%d bytes remained after slicing data\n", size);
385  return lines;
386 }
387 
388 static int teletext_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *pkt)
389 {
390  TeletextContext *ctx = avctx->priv_data;
391  AVSubtitle *sub = data;
392  int ret = 0;
393  int j;
394 
395  if (!ctx->vbi) {
396  if (!(ctx->vbi = vbi_decoder_new()))
397  return AVERROR(ENOMEM);
398  if (!vbi_event_handler_add(ctx->vbi, VBI_EVENT_TTX_PAGE, handler, ctx)) {
399  vbi_decoder_delete(ctx->vbi);
400  ctx->vbi = NULL;
401  return AVERROR(ENOMEM);
402  }
403  }
404 
405  if (avctx->pkt_timebase.num && pkt->pts != AV_NOPTS_VALUE)
406  ctx->pts = av_rescale_q(pkt->pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
407 
408  if (pkt->size) {
409  int lines;
410  const int full_pes_size = pkt->size + 45; /* PES header is 45 bytes */
411 
412  // We allow unreasonably big packets, even if the standard only allows a max size of 1472
413  if (full_pes_size < 184 || full_pes_size > 65504 || full_pes_size % 184 != 0)
414  return AVERROR_INVALIDDATA;
415 
416  ctx->handler_ret = pkt->size;
417 
419  if ((lines = slice_to_vbi_lines(ctx, pkt->data + 1, pkt->size - 1)) < 0)
420  return lines;
421  ff_dlog(avctx, "ctx=%p buf_size=%d lines=%u pkt_pts=%7.3f\n",
422  ctx, pkt->size, lines, (double)pkt->pts/90000.0);
423  if (lines > 0) {
424 #ifdef DEBUG
425  int i;
426  av_log(avctx, AV_LOG_DEBUG, "line numbers:");
427  for(i = 0; i < lines; i++)
428  av_log(avctx, AV_LOG_DEBUG, " %d", ctx->sliced[i].line);
429  av_log(avctx, AV_LOG_DEBUG, "\n");
430 #endif
431  vbi_decode(ctx->vbi, ctx->sliced, lines, 0.0);
432  ctx->lines_processed += lines;
433  }
434  }
435  ctx->pts = AV_NOPTS_VALUE;
436  ret = ctx->handler_ret;
437  }
438 
439  if (ret < 0)
440  return ret;
441 
442  // is there a subtitle to pass?
443  if (ctx->nb_pages) {
444  int i;
445  sub->format = ctx->format_id;
446  sub->start_display_time = 0;
447  sub->end_display_time = ctx->sub_duration;
448  sub->num_rects = 0;
449  sub->pts = ctx->pages->pts;
450 
451  if (ctx->pages->sub_rect->type != SUBTITLE_NONE) {
452  sub->rects = av_malloc(sizeof(*sub->rects));
453  if (sub->rects) {
454  sub->num_rects = 1;
455  sub->rects[0] = ctx->pages->sub_rect;
456 #if FF_API_AVPICTURE
458  for (j = 0; j < 4; j++) {
459  sub->rects[0]->pict.data[j] = sub->rects[0]->data[j];
460  sub->rects[0]->pict.linesize[j] = sub->rects[0]->linesize[j];
461  }
463 #endif
464  } else {
465  ret = AVERROR(ENOMEM);
466  }
467  } else {
468  av_log(avctx, AV_LOG_DEBUG, "sending empty sub\n");
469  sub->rects = NULL;
470  }
471  if (!sub->rects) // no rect was passed
473 
474  for (i = 0; i < ctx->nb_pages - 1; i++)
475  ctx->pages[i] = ctx->pages[i + 1];
476  ctx->nb_pages--;
477 
478  if (ret >= 0)
479  *data_size = 1;
480  } else
481  *data_size = 0;
482 
483  return ret;
484 }
485 
487 {
488  TeletextContext *ctx = avctx->priv_data;
489  unsigned int maj, min, rev;
490 
491  vbi_version(&maj, &min, &rev);
492  if (!(maj > 0 || min > 2 || min == 2 && rev >= 26)) {
493  av_log(avctx, AV_LOG_ERROR, "decoder needs zvbi version >= 0.2.26.\n");
494  return AVERROR_EXTERNAL;
495  }
496 
497  if (ctx->format_id == 0) {
498  avctx->width = 41 * BITMAP_CHAR_WIDTH;
499  avctx->height = 25 * BITMAP_CHAR_HEIGHT;
500  }
501 
502  ctx->vbi = NULL;
503  ctx->pts = AV_NOPTS_VALUE;
504 
505  if (ctx->opacity == -1)
506  ctx->opacity = ctx->transparent_bg ? 0 : 255;
507 
508 #ifdef DEBUG
509  {
510  char *t;
511  ctx->ex = vbi_export_new("text", &t);
512  }
513 #endif
514  av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
515  return (ctx->format_id == 1) ? ff_ass_subtitle_header_default(avctx) : 0;
516 }
517 
519 {
520  TeletextContext *ctx = avctx->priv_data;
521 
522  ff_dlog(avctx, "lines_total=%u\n", ctx->lines_processed);
523  while (ctx->nb_pages)
524  subtitle_rect_free(&ctx->pages[--ctx->nb_pages].sub_rect);
525  av_freep(&ctx->pages);
526 
527  vbi_decoder_delete(ctx->vbi);
528  ctx->vbi = NULL;
529  ctx->pts = AV_NOPTS_VALUE;
530  if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
531  ctx->readorder = 0;
532  return 0;
533 }
534 
535 static void teletext_flush(AVCodecContext *avctx)
536 {
537  teletext_close_decoder(avctx);
538 }
539 
540 #define OFFSET(x) offsetof(TeletextContext, x)
541 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
542 static const AVOption options[] = {
543  {"txt_page", "list of teletext page numbers to decode, * is all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, SD},
544  {"txt_chop_top", "discards the top teletext line", OFFSET(chop_top), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
545  {"txt_format", "format of the subtitles (bitmap or text)", OFFSET(format_id), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD, "txt_format"},
546  {"bitmap", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, SD, "txt_format"},
547  {"text", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, SD, "txt_format"},
548  {"txt_left", "x offset of generated bitmaps", OFFSET(x_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
549  {"txt_top", "y offset of generated bitmaps", OFFSET(y_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
550  {"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
551  {"txt_duration", "display duration of teletext pages in msecs", OFFSET(sub_duration), AV_OPT_TYPE_INT, {.i64 = 30000}, 0, 86400000, SD},
552  {"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
553  {"txt_opacity", "set opacity of the transparent background", OFFSET(opacity), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, SD},
554  { NULL },
555 };
556 
557 static const AVClass teletext_class = {
558  .class_name = "libzvbi_teletextdec",
559  .item_name = av_default_item_name,
560  .option = options,
561  .version = LIBAVUTIL_VERSION_INT,
562 };
563 
565  .name = "libzvbi_teletextdec",
566  .long_name = NULL_IF_CONFIG_SMALL("Libzvbi DVB teletext decoder"),
567  .type = AVMEDIA_TYPE_SUBTITLE,
569  .priv_data_size = sizeof(TeletextContext),
571  .close = teletext_close_decoder,
573  .capabilities = AV_CODEC_CAP_DELAY,
575  .priv_class= &teletext_class,
576 };
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
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3863
AVOption.
Definition: opt.h:245
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: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:3867
int size
Definition: avcodec.h:1580
const char * b
Definition: vf_curves.c:109
static char * create_ass_text(TeletextContext *ctx, const char *text)
vbi_sliced sliced[MAX_SLICES]
static int chop_spaces_utf8(const unsigned char *t, int len)
unsigned num_rects
Definition: avcodec.h:3901
#define OFFSET(x)
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3541
#define MAX_SLICES
attribute_deprecated AVPicture pict
Definition: avcodec.h:3874
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
AVSubtitleRect ** rects
Definition: avcodec.h:3902
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:3865
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:980
uint8_t
#define av_malloc(s)
AVOptions.
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3834
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:1579
#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:3866
#define AV_CODEC_FLAG2_RO_FLUSH_NOOP
Do not reset ASS ReadOrder field on flush (subtitles decoding)
Definition: avcodec.h:937
#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:3353
#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:3864
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:3548
#define VBI_G(rgba)
#define BITMAP_CHAR_WIDTH
uint32_t end_display_time
Definition: avcodec.h:3900
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3903
AVCodec ff_libzvbi_teletext_decoder
common internal API header
A bitmap, pict will be set.
Definition: avcodec.h:3845
int linesize[4]
Definition: avcodec.h:3881
#define VBI_B(rgba)
int width
picture width / height.
Definition: avcodec.h:1835
AVFormatContext * ctx
Definition: movenc.c:48
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3832
#define TRUE
Definition: windows2linux.h:33
uint16_t format
Definition: avcodec.h:3898
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:3880
#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:1648
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)
#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:722
#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:3899
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:1690
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:3857
#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:131
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:3892
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1750
#define av_freep(p)
static void subtitle_rect_free(AVSubtitleRect **sub_rect)
enum AVSubtitleType type
Definition: avcodec.h:3883
float min
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
This structure stores compressed data.
Definition: avcodec.h:1556
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:1572
AVSubtitleRect * sub_rect
for(j=16;j >0;--j)
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240