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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/intreadwrite.h"
26 #include "libavutil/log.h"
27 
28 #include <libzvbi.h>
29 
30 #define TEXT_MAXSZ (25 * (56 + 1) * 4 + 2)
31 #define VBI_NB_COLORS 40
32 #define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
33 #define VBI_R(rgba) (((rgba) >> 0) & 0xFF)
34 #define VBI_G(rgba) (((rgba) >> 8) & 0xFF)
35 #define VBI_B(rgba) (((rgba) >> 16) & 0xFF)
36 #define VBI_A(rgba) (((rgba) >> 24) & 0xFF)
37 #define MAX_BUFFERED_PAGES 25
38 #define BITMAP_CHAR_WIDTH 12
39 #define BITMAP_CHAR_HEIGHT 10
40 #define MAX_SLICES 64
41 
42 typedef struct TeletextPage
43 {
44  AVSubtitleRect *sub_rect;
45  int pgno;
46  int subno;
47  int64_t pts;
48 } TeletextPage;
49 
50 typedef struct TeletextContext
51 {
52  AVClass *class;
53  char *pgno;
54  int x_offset;
55  int y_offset;
56  int format_id; /* 0 = bitmap, 1 = text/ass */
57  int chop_top;
58  int sub_duration; /* in msec */
59  int transparent_bg;
60  int chop_spaces;
61 
62  int lines_processed;
63  TeletextPage *pages;
64  int nb_pages;
65  int64_t pts;
66  int handler_ret;
67 
68  vbi_decoder * vbi;
69 #ifdef DEBUG
70  vbi_export * ex;
71 #endif
72  vbi_sliced sliced[MAX_SLICES];
73 } TeletextContext;
74 
75 static int chop_spaces_utf8(const unsigned char* t, int len)
76 {
77  t += len;
78  while (len > 0) {
79  if (*--t != ' ' || (len-1 > 0 && *(t-1) & 0x80))
80  break;
81  --len;
82  }
83  return len;
84 }
85 
86 static void subtitle_rect_free(AVSubtitleRect **sub_rect)
87 {
88  av_freep(&(*sub_rect)->pict.data[0]);
89  av_freep(&(*sub_rect)->pict.data[1]);
90  av_freep(&(*sub_rect)->ass);
91  av_freep(sub_rect);
92 }
93 
94 static int create_ass_text(TeletextContext *ctx, const char *text, char **ass)
95 {
96  int ret;
97  AVBPrint buf, buf2;
98  const int ts_start = av_rescale_q(ctx->pts, AV_TIME_BASE_Q, (AVRational){1, 100});
99  const int ts_duration = av_rescale_q(ctx->sub_duration, (AVRational){1, 1000}, (AVRational){1, 100});
100 
101  /* First we escape the plain text into buf. */
102  av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
103  ff_ass_bprint_text_event(&buf, text, strlen(text), "", 0);
104 
105  if (!av_bprint_is_complete(&buf)) {
106  av_bprint_finalize(&buf, NULL);
107  return AVERROR(ENOMEM);
108  }
109 
110  /* Then we create the ass dialog line in buf2 from the escaped text in buf. */
111  av_bprint_init(&buf2, 0, AV_BPRINT_SIZE_UNLIMITED);
112  ff_ass_bprint_dialog(&buf2, buf.str, ts_start, ts_duration, 0);
113  av_bprint_finalize(&buf, NULL);
114 
115  if (!av_bprint_is_complete(&buf2)) {
116  av_bprint_finalize(&buf2, NULL);
117  return AVERROR(ENOMEM);
118  }
119 
120  if ((ret = av_bprint_finalize(&buf2, ass)) < 0)
121  return ret;
122 
123  return 0;
124 }
125 
126 /* Draw a page as text */
127 static int gen_sub_text(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
128 {
129  const char *in;
130  AVBPrint buf;
131  char *vbi_text = av_malloc(TEXT_MAXSZ);
132  int sz;
133 
134  if (!vbi_text)
135  return AVERROR(ENOMEM);
136 
137  sz = vbi_print_page_region(page, vbi_text, TEXT_MAXSZ-1, "UTF-8",
138  /*table mode*/ TRUE, FALSE,
139  0, chop_top,
140  page->columns, page->rows-chop_top);
141  if (sz <= 0) {
142  av_log(ctx, AV_LOG_ERROR, "vbi_print error\n");
143  av_free(vbi_text);
144  return AVERROR_EXTERNAL;
145  }
146  vbi_text[sz] = '\0';
147  in = vbi_text;
148  av_bprint_init(&buf, 0, TEXT_MAXSZ);
149 
150  if (ctx->chop_spaces) {
151  for (;;) {
152  int nl, sz;
153 
154  // skip leading spaces and newlines
155  in += strspn(in, " \n");
156  // compute end of row
157  for (nl = 0; in[nl]; ++nl)
158  if (in[nl] == '\n' && (nl==0 || !(in[nl-1] & 0x80)))
159  break;
160  if (!in[nl])
161  break;
162  // skip trailing spaces
163  sz = chop_spaces_utf8(in, nl);
164  av_bprint_append_data(&buf, in, sz);
165  av_bprintf(&buf, "\n");
166  in += nl;
167  }
168  } else {
169  av_bprintf(&buf, "%s\n", vbi_text);
170  }
171  av_free(vbi_text);
172 
173  if (!av_bprint_is_complete(&buf)) {
174  av_bprint_finalize(&buf, NULL);
175  return AVERROR(ENOMEM);
176  }
177 
178  if (buf.len) {
179  int ret;
180  sub_rect->type = SUBTITLE_ASS;
181  if ((ret = create_ass_text(ctx, buf.str, &sub_rect->ass)) < 0) {
182  av_bprint_finalize(&buf, NULL);
183  return ret;
184  }
185  av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
186  } else {
187  sub_rect->type = SUBTITLE_NONE;
188  }
189  av_bprint_finalize(&buf, NULL);
190  return 0;
191 }
192 
193 static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page,
194  int chop_top, uint8_t transparent_color, int resx, int resy)
195 {
196  int iy;
197 
198  // Hack for transparency, inspired by VLC code...
199  for (iy = 0; iy < resy; iy++) {
200  uint8_t *pixel = sub_rect->pict.data[0] + iy * sub_rect->pict.linesize[0];
201  vbi_char *vc = page->text + (iy / BITMAP_CHAR_HEIGHT + chop_top) * page->columns;
202  vbi_char *vcnext = vc + page->columns;
203  for (; vc < vcnext; vc++) {
204  uint8_t *pixelnext = pixel + BITMAP_CHAR_WIDTH;
205  switch (vc->opacity) {
206  case VBI_TRANSPARENT_SPACE:
207  memset(pixel, transparent_color, BITMAP_CHAR_WIDTH);
208  break;
209  case VBI_OPAQUE:
210  case VBI_SEMI_TRANSPARENT:
211  if (!ctx->transparent_bg)
212  break;
213  case VBI_TRANSPARENT_FULL:
214  for(; pixel < pixelnext; pixel++)
215  if (*pixel == vc->background)
216  *pixel = transparent_color;
217  break;
218  }
219  pixel = pixelnext;
220  }
221  }
222 }
223 
224 /* Draw a page as bitmap */
225 static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
226 {
227  int resx = page->columns * BITMAP_CHAR_WIDTH;
228  int resy = (page->rows - chop_top) * BITMAP_CHAR_HEIGHT;
229  uint8_t ci, cmax = 0;
230  int ret;
231  vbi_char *vc = page->text + (chop_top * page->columns);
232  vbi_char *vcend = page->text + (page->rows * page->columns);
233 
234  for (; vc < vcend; vc++) {
235  if (vc->opacity != VBI_TRANSPARENT_SPACE) {
236  cmax = VBI_NB_COLORS;
237  break;
238  }
239  }
240 
241  if (cmax == 0) {
242  av_log(ctx, AV_LOG_DEBUG, "dropping empty page %3x\n", page->pgno);
243  sub_rect->type = SUBTITLE_NONE;
244  return 0;
245  }
246 
247  if ((ret = avpicture_alloc(&sub_rect->pict, AV_PIX_FMT_PAL8, resx, resy)) < 0)
248  return ret;
249  // Yes, we want to allocate the palette on our own because AVSubtitle works this way
250  sub_rect->pict.data[1] = NULL;
251 
252  vbi_draw_vt_page_region(page, VBI_PIXFMT_PAL8,
253  sub_rect->pict.data[0], sub_rect->pict.linesize[0],
254  0, chop_top, page->columns, page->rows - chop_top,
255  /*reveal*/ 1, /*flash*/ 1);
256 
257  fix_transparency(ctx, sub_rect, page, chop_top, cmax, resx, resy);
258  sub_rect->x = ctx->x_offset;
259  sub_rect->y = ctx->y_offset + chop_top * BITMAP_CHAR_HEIGHT;
260  sub_rect->w = resx;
261  sub_rect->h = resy;
262  sub_rect->nb_colors = (int)cmax + 1;
263  sub_rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
264  if (!sub_rect->pict.data[1]) {
265  av_freep(&sub_rect->pict.data[0]);
266  return AVERROR(ENOMEM);
267  }
268  for (ci = 0; ci < cmax; ci++) {
269  int r, g, b, a;
270 
271  r = VBI_R(page->color_map[ci]);
272  g = VBI_G(page->color_map[ci]);
273  b = VBI_B(page->color_map[ci]);
274  a = VBI_A(page->color_map[ci]);
275  ((uint32_t *)sub_rect->pict.data[1])[ci] = RGBA(r, g, b, a);
276  av_dlog(ctx, "palette %0x\n", ((uint32_t *)sub_rect->pict.data[1])[ci]);
277  }
278  ((uint32_t *)sub_rect->pict.data[1])[cmax] = RGBA(0, 0, 0, 0);
279  sub_rect->type = SUBTITLE_BITMAP;
280  return 0;
281 }
282 
283 static void handler(vbi_event *ev, void *user_data)
284 {
285  TeletextContext *ctx = user_data;
286  TeletextPage *new_pages;
287  vbi_page page;
288  int res;
289  char pgno_str[12];
290  vbi_subno subno;
291  vbi_page_type vpt;
292  int chop_top;
293  char *lang;
294 
295  snprintf(pgno_str, sizeof pgno_str, "%03x", ev->ev.ttx_page.pgno);
296  av_log(ctx, AV_LOG_DEBUG, "decoded page %s.%02x\n",
297  pgno_str, ev->ev.ttx_page.subno & 0xFF);
298 
299  if (strcmp(ctx->pgno, "*") && !strstr(ctx->pgno, pgno_str))
300  return;
301  if (ctx->handler_ret < 0)
302  return;
303 
304  res = vbi_fetch_vt_page(ctx->vbi, &page,
305  ev->ev.ttx_page.pgno,
306  ev->ev.ttx_page.subno,
307  VBI_WST_LEVEL_3p5, 25, TRUE);
308 
309  if (!res)
310  return;
311 
312 #ifdef DEBUG
313  fprintf(stderr, "\nSaving res=%d dy0=%d dy1=%d...\n",
314  res, page.dirty.y0, page.dirty.y1);
315  fflush(stderr);
316 
317  if (!vbi_export_stdio(ctx->ex, stderr, &page))
318  fprintf(stderr, "failed: %s\n", vbi_export_errstr(ctx->ex));
319 #endif
320 
321  vpt = vbi_classify_page(ctx->vbi, ev->ev.ttx_page.pgno, &subno, &lang);
322  chop_top = ctx->chop_top ||
323  ((page.rows > 1) && (vpt == VBI_SUBTITLE_PAGE));
324 
325  av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
326  page.columns, page.rows, chop_top);
327 
328  if (ctx->nb_pages < MAX_BUFFERED_PAGES) {
329  if ((new_pages = av_realloc_array(ctx->pages, ctx->nb_pages + 1, sizeof(TeletextPage)))) {
330  TeletextPage *cur_page = new_pages + ctx->nb_pages;
331  ctx->pages = new_pages;
332  cur_page->sub_rect = av_mallocz(sizeof(*cur_page->sub_rect));
333  cur_page->pts = ctx->pts;
334  cur_page->pgno = ev->ev.ttx_page.pgno;
335  cur_page->subno = ev->ev.ttx_page.subno;
336  if (cur_page->sub_rect) {
337  res = (ctx->format_id == 0) ?
338  gen_sub_bitmap(ctx, cur_page->sub_rect, &page, chop_top) :
339  gen_sub_text (ctx, cur_page->sub_rect, &page, chop_top);
340  if (res < 0) {
341  av_freep(&cur_page->sub_rect);
342  ctx->handler_ret = res;
343  } else {
344  ctx->pages[ctx->nb_pages++] = *cur_page;
345  }
346  } else {
347  ctx->handler_ret = AVERROR(ENOMEM);
348  }
349  } else {
350  ctx->handler_ret = AVERROR(ENOMEM);
351  }
352  } else {
353  //TODO: If multiple packets contain more than one page, pages may got queued up, and this may happen...
354  av_log(ctx, AV_LOG_ERROR, "Buffered too many pages, dropping page %s.\n", pgno_str);
355  ctx->handler_ret = AVERROR(ENOSYS);
356  }
357 
358  vbi_unref_page(&page);
359 }
360 
361 static inline int data_identifier_is_teletext(int data_identifier) {
362  /* See EN 301 775 section 4.4.2. */
363  return (data_identifier >= 0x10 && data_identifier <= 0x1F ||
364  data_identifier >= 0x99 && data_identifier <= 0x9B);
365 }
366 
367 static int slice_to_vbi_lines(TeletextContext *ctx, uint8_t* buf, int size)
368 {
369  int lines = 0;
370  while (size >= 2 && lines < MAX_SLICES) {
371  int data_unit_id = buf[0];
372  int data_unit_length = buf[1];
373  if (data_unit_length + 2 > size)
374  return AVERROR_INVALIDDATA;
375  if (data_unit_id == 0x02 || data_unit_id == 0x03) {
376  if (data_unit_length != 0x2c)
377  return AVERROR_INVALIDDATA;
378  else {
379  int line_offset = buf[2] & 0x1f;
380  int field_parity = buf[2] & 0x20;
381  int i;
382  ctx->sliced[lines].id = VBI_SLICED_TELETEXT_B;
383  ctx->sliced[lines].line = (line_offset > 0 ? (line_offset + (field_parity ? 0 : 313)) : 0);
384  for (i = 0; i < 42; i++)
385  ctx->sliced[lines].data[i] = vbi_rev8(buf[4 + i]);
386  lines++;
387  }
388  }
389  size -= data_unit_length + 2;
390  buf += data_unit_length + 2;
391  }
392  if (size)
393  av_log(ctx, AV_LOG_WARNING, "%d bytes remained after slicing data\n", size);
394  return lines;
395 }
396 
397 static int teletext_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *pkt)
398 {
399  TeletextContext *ctx = avctx->priv_data;
400  AVSubtitle *sub = data;
401  int ret = 0;
402 
403  if (!ctx->vbi) {
404  if (!(ctx->vbi = vbi_decoder_new()))
405  return AVERROR(ENOMEM);
406  if (!vbi_event_handler_add(ctx->vbi, VBI_EVENT_TTX_PAGE, handler, ctx)) {
407  vbi_decoder_delete(ctx->vbi);
408  ctx->vbi = NULL;
409  return AVERROR(ENOMEM);
410  }
411  }
412 
413  if (avctx->pkt_timebase.den && pkt->pts != AV_NOPTS_VALUE)
414  ctx->pts = av_rescale_q(pkt->pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
415 
416  if (pkt->size) {
417  int lines;
418  const int full_pes_size = pkt->size + 45; /* PES header is 45 bytes */
419 
420  // We allow unreasonably big packets, even if the standard only allows a max size of 1472
421  if (full_pes_size < 184 || full_pes_size > 65504 || full_pes_size % 184 != 0)
422  return AVERROR_INVALIDDATA;
423 
424  ctx->handler_ret = pkt->size;
425 
426  if (data_identifier_is_teletext(*pkt->data)) {
427  if ((lines = slice_to_vbi_lines(ctx, pkt->data + 1, pkt->size - 1)) < 0)
428  return lines;
429  av_dlog(avctx, "ctx=%p buf_size=%d lines=%u pkt_pts=%7.3f\n",
430  ctx, pkt->size, lines, (double)pkt->pts/90000.0);
431  if (lines > 0) {
432 #ifdef DEBUG
433  int i;
434  av_log(avctx, AV_LOG_DEBUG, "line numbers:");
435  for(i = 0; i < lines; i++)
436  av_log(avctx, AV_LOG_DEBUG, " %d", ctx->sliced[i].line);
437  av_log(avctx, AV_LOG_DEBUG, "\n");
438 #endif
439  vbi_decode(ctx->vbi, ctx->sliced, lines, 0.0);
440  ctx->lines_processed += lines;
441  }
442  }
443  ctx->pts = AV_NOPTS_VALUE;
444  ret = ctx->handler_ret;
445  }
446 
447  if (ret < 0)
448  return ret;
449 
450  // is there a subtitle to pass?
451  if (ctx->nb_pages) {
452  int i;
453  sub->format = ctx->format_id;
454  sub->start_display_time = 0;
455  sub->end_display_time = ctx->sub_duration;
456  sub->num_rects = 0;
457  sub->pts = ctx->pages->pts;
458 
459  if (ctx->pages->sub_rect->type != SUBTITLE_NONE) {
460  sub->rects = av_malloc(sizeof(*sub->rects));
461  if (sub->rects) {
462  sub->num_rects = 1;
463  sub->rects[0] = ctx->pages->sub_rect;
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
472  subtitle_rect_free(&ctx->pages->sub_rect);
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 
486 static int teletext_init_decoder(AVCodecContext *avctx)
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 #ifdef DEBUG
506  {
507  char *t;
508  ctx->ex = vbi_export_new("text", &t);
509  }
510 #endif
511  av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
512  return (ctx->format_id == 1) ? ff_ass_subtitle_header_default(avctx) : 0;
513 }
514 
515 static int teletext_close_decoder(AVCodecContext *avctx)
516 {
517  TeletextContext *ctx = avctx->priv_data;
518 
519  av_dlog(avctx, "lines_total=%u\n", ctx->lines_processed);
520  while (ctx->nb_pages)
521  subtitle_rect_free(&ctx->pages[--ctx->nb_pages].sub_rect);
522  av_freep(&ctx->pages);
523 
524  vbi_decoder_delete(ctx->vbi);
525  ctx->vbi = NULL;
526  ctx->pts = AV_NOPTS_VALUE;
527  return 0;
528 }
529 
530 static void teletext_flush(AVCodecContext *avctx)
531 {
532  teletext_close_decoder(avctx);
533 }
534 
535 #define OFFSET(x) offsetof(TeletextContext, x)
536 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
537 static const AVOption options[] = {
538  {"txt_page", "list of teletext page numbers to decode, * is all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, SD},
539  {"txt_chop_top", "discards the top teletext line", OFFSET(chop_top), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
540  {"txt_format", "format of the subtitles (bitmap or text)", OFFSET(format_id), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD, "txt_format"},
541  {"bitmap", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, SD, "txt_format"},
542  {"text", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, SD, "txt_format"},
543  {"txt_left", "x offset of generated bitmaps", OFFSET(x_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
544  {"txt_top", "y offset of generated bitmaps", OFFSET(y_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
545  {"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
546  {"txt_duration", "display duration of teletext pages in msecs", OFFSET(sub_duration), AV_OPT_TYPE_INT, {.i64 = 30000}, 0, 86400000, SD},
547  {"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
548  { NULL },
549 };
550 
551 static const AVClass teletext_class = {
552  .class_name = "libzvbi_teletextdec",
553  .item_name = av_default_item_name,
554  .option = options,
555  .version = LIBAVUTIL_VERSION_INT,
556 };
557 
558 AVCodec ff_libzvbi_teletext_decoder = {
559  .name = "libzvbi_teletextdec",
560  .long_name = NULL_IF_CONFIG_SMALL("Libzvbi DVB teletext decoder"),
561  .type = AVMEDIA_TYPE_SUBTITLE,
562  .id = AV_CODEC_ID_DVB_TELETEXT,
563  .priv_data_size = sizeof(TeletextContext),
564  .init = teletext_init_decoder,
565  .close = teletext_close_decoder,
566  .decode = teletext_decode_frame,
567  .capabilities = CODEC_CAP_DELAY,
568  .flush = teletext_flush,
569  .priv_class= &teletext_class,
570 };
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