1 /*****************************************************************************
2 * telx.c : Minimalistic Teletext subtitles decoder
3 *****************************************************************************
4 * Copyright (C) 2007 Vincent Penne
5 * Some code converted from ProjectX java dvb decoder (c) 2001-2005 by dvb.matt
6 * $Id: b0a4e773f2742f71ac735ddc74f510fa7531279a $
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
22 /*****************************************************************************
23 *
24 * information on teletext format can be found here :
25 * http://pdc.ro.nu/teletext.html
26 *
27 *****************************************************************************/
28 #ifdef HAVE_CONFIG_H
29 # include "config.h"
30 #endif
31 #include <assert.h>
32 #include <stdint.h>
33
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
36
37 #include <vlc_bits.h>
38 #include <vlc_codec.h>
39
40 /* #define TELX_DEBUG */
41 #ifdef TELX_DEBUG
42 # define dbg( a ) msg_Dbg a
43 #else
44 # define dbg( a )
45 #endif
46
47 /*****************************************************************************
48 * Module descriptor.
49 *****************************************************************************/
50 static int Open ( vlc_object_t * );
51 static void Close( vlc_object_t * );
52 static int Decode( decoder_t *, block_t * );
53
54 #define OVERRIDE_PAGE_TEXT N_("Override page")
55 #define OVERRIDE_PAGE_LONGTEXT N_("Override the indicated page, try this if " \
56 "your subtitles don't appear (-1 = autodetect from TS, " \
57 "0 = autodetect from teletext, " \
58 ">0 = actual page number, usually 888 or 889).")
59
60 #define IGNORE_SUB_FLAG_TEXT N_("Ignore subtitle flag")
61 #define IGNORE_SUB_FLAG_LONGTEXT N_("Ignore the subtitle flag, try this if " \
62 "your subtitles don't appear.")
63
64 #define FRENCH_WORKAROUND_TEXT N_("Workaround for France")
65 #define FRENCH_WORKAROUND_LONGTEXT N_("Some French channels do not flag " \
66 "their subtitling pages correctly due to a historical " \
67 "interpretation mistake. Try using this wrong interpretation if " \
68 "your subtitles don't appear.")
69
70 vlc_module_begin ()
71 set_description( N_("Teletext subtitles decoder") )
72 set_shortname( "Teletext" )
73 set_capability( "spu decoder", 50 )
74 set_category( CAT_INPUT )
75 set_subcategory( SUBCAT_INPUT_SCODEC )
76 set_callbacks( Open, Close )
77
78 add_integer( "telx-override-page", -1,
79 OVERRIDE_PAGE_TEXT, OVERRIDE_PAGE_LONGTEXT, true )
80 add_bool( "telx-ignore-subtitle-flag", false,
81 IGNORE_SUB_FLAG_TEXT, IGNORE_SUB_FLAG_LONGTEXT, true )
82 add_bool( "telx-french-workaround", false,
83 FRENCH_WORKAROUND_TEXT, FRENCH_WORKAROUND_LONGTEXT, true )
84
85 vlc_module_end ()
86
87 /****************************************************************************
88 * Local structures
89 ****************************************************************************/
90
91 struct decoder_sys_t
92 {
93 int i_align;
94 bool b_is_subtitle[9];
95 char ppsz_lines[32][128];
96 char psz_prev_text[512];
97 mtime_t prev_pts;
98 int i_page[9];
99 bool b_erase[9];
100 const uint16_t * pi_active_national_set[9];
101 int i_wanted_page, i_wanted_magazine;
102 bool b_ignore_sub_flag;
103 };
104
105 /****************************************************************************
106 * Local data
107 ****************************************************************************/
108
109 /*
110 * My doc only mentions 13 national characters, but experiments show there
111 * are more, in france for example I already found two more (0x9 and 0xb).
112 *
113 * Conversion is in this order :
114 *
115 * 0x23 0x24 0x40 0x5b 0x5c 0x5d 0x5e 0x5f 0x60 0x7b 0x7c 0x7d 0x7e
116 * (these are the standard ones)
117 * 0x08 0x09 0x0a 0x0b 0x0c 0x0d (apparently a control character) 0x0e 0x0f
118 */
119
120 static const uint16_t ppi_national_subsets[][20] =
121 {
122 { 0x00a3, 0x0024, 0x0040, 0x00ab, 0x00bd, 0x00bb, 0x005e, 0x0023,
123 0x002d, 0x00bc, 0x00a6, 0x00be, 0x00f7 }, /* english ,000 */
124
125 { 0x00e9, 0x00ef, 0x00e0, 0x00eb, 0x00ea, 0x00f9, 0x00ee, 0x0023,
126 0x00e8, 0x00e2, 0x00f4, 0x00fb, 0x00e7, 0, 0x00eb, 0, 0x00ef }, /* french ,001 */
127
128 { 0x0023, 0x00a4, 0x00c9, 0x00c4, 0x00d6, 0x00c5, 0x00dc, 0x005f,
129 0x00e9, 0x00e4, 0x00f6, 0x00e5, 0x00fc }, /* swedish,finnish,hungarian ,010 */
130
131 { 0x0023, 0x016f, 0x010d, 0x0165, 0x017e, 0x00fd, 0x00ed, 0x0159,
132 0x00e9, 0x00e1, 0x011b, 0x00fa, 0x0161 }, /* czech,slovak ,011 */
133
134 { 0x0023, 0x0024, 0x00a7, 0x00c4, 0x00d6, 0x00dc, 0x005e, 0x005f,
135 0x00b0, 0x00e4, 0x00f6, 0x00fc, 0x00df }, /* german ,100 */
136
137 { 0x00e7, 0x0024, 0x00a1, 0x00e1, 0x00e9, 0x00ed, 0x00f3, 0x00fa,
138 0x00bf, 0x00fc, 0x00f1, 0x00e8, 0x00e0 }, /* portuguese,spanish ,101 */
139
140 { 0x00a3, 0x0024, 0x00e9, 0x00b0, 0x00e7, 0x00bb, 0x005e, 0x0023,
141 0x00f9, 0x00e0, 0x00f2, 0x00e8, 0x00ec }, /* italian ,110 */
142
143 { 0x0023, 0x00a4, 0x0162, 0x00c2, 0x015e, 0x0102, 0x00ce, 0x0131,
144 0x0163, 0x00e2, 0x015f, 0x0103, 0x00ee }, /* rumanian ,111 */
145
146 /* I have these tables too, but I don't know how they can be triggered */
147 { 0x0023, 0x0024, 0x0160, 0x0117, 0x0119, 0x017d, 0x010d, 0x016b,
148 0x0161, 0x0105, 0x0173, 0x017e, 0x012f }, /* lettish,lithuanian ,1000 */
149
150 { 0x0023, 0x0144, 0x0105, 0x005a, 0x015a, 0x0141, 0x0107, 0x00f3,
151 0x0119, 0x017c, 0x015b, 0x0142, 0x017a }, /* polish, 1001 */
152
153 { 0x0023, 0x00cb, 0x010c, 0x0106, 0x017d, 0x0110, 0x0160, 0x00eb,
154 0x010d, 0x0107, 0x017e, 0x0111, 0x0161 }, /* serbian,croatian,slovenian, 1010 */
155
156 { 0x0023, 0x00f5, 0x0160, 0x00c4, 0x00d6, 0x017e, 0x00dc, 0x00d5,
157 0x0161, 0x00e4, 0x00f6, 0x017e, 0x00fc }, /* estonian ,1011 */
158
159 { 0x0054, 0x011f, 0x0130, 0x015e, 0x00d6, 0x00c7, 0x00dc, 0x011e,
160 0x0131, 0x015f, 0x00f6, 0x00e7, 0x00fc }, /* turkish ,1100 */
161 };
162
163
164 /*****************************************************************************
165 * Open: probe the decoder and return score
166 *****************************************************************************
167 * Tries to launch a decoder and return score so that the interface is able
168 * to chose.
169 *****************************************************************************/
Open(vlc_object_t * p_this)170 static int Open( vlc_object_t *p_this )
171 {
172 decoder_t *p_dec = (decoder_t *) p_this;
173 decoder_sys_t *p_sys = NULL;
174 int i_val;
175
176
177 if( p_dec->fmt_in.i_codec != VLC_CODEC_TELETEXT)
178 {
179 return VLC_EGENERIC;
180 }
181
182 p_dec->pf_decode = Decode;
183 p_sys = p_dec->p_sys = calloc( 1, sizeof(*p_sys) );
184 if( p_sys == NULL )
185 return VLC_ENOMEM;
186 p_dec->fmt_out.i_codec = 0;
187
188 p_sys->i_align = 0;
189 for ( int i = 0; i < 9; i++ )
190 p_sys->pi_active_national_set[i] = ppi_national_subsets[1];
191
192 i_val = var_CreateGetInteger( p_dec, "telx-override-page" );
193 if( i_val == -1 && p_dec->fmt_in.subs.teletext.i_magazine != -1 &&
194 ( p_dec->fmt_in.subs.teletext.i_magazine != 1 ||
195 p_dec->fmt_in.subs.teletext.i_page != 0 ) ) /* ignore if TS demux wants page 100 (unlikely to be sub) */
196 {
197 bool b_val;
198 p_sys->i_wanted_magazine = p_dec->fmt_in.subs.teletext.i_magazine;
199 p_sys->i_wanted_page = p_dec->fmt_in.subs.teletext.i_page;
200
201 b_val = var_CreateGetBool( p_dec, "telx-french-workaround" );
202 if( p_sys->i_wanted_page < 100 &&
203 (b_val || (p_sys->i_wanted_page % 16) >= 10))
204 {
205 /* See http://www.nada.kth.se/~ragge/vdr/ttxtsubs/TROUBLESHOOTING.txt
206 * paragraph about French channels - they mix up decimal and
207 * hexadecimal */
208 p_sys->i_wanted_page = (p_sys->i_wanted_page / 10) * 16 +
209 (p_sys->i_wanted_page % 10);
210 }
211 }
212 else if( i_val <= 0 )
213 {
214 p_sys->i_wanted_magazine = -1;
215 p_sys->i_wanted_page = -1;
216 }
217 else
218 {
219 p_sys->i_wanted_magazine = i_val / 100;
220 p_sys->i_wanted_page = (((i_val % 100) / 10) << 4)
221 |((i_val % 100) % 10);
222 }
223 p_sys->b_ignore_sub_flag = var_CreateGetBool( p_dec,
224 "telx-ignore-subtitle-flag" );
225
226 msg_Dbg( p_dec, "starting telx on magazine %d page %02x flag %d",
227 p_sys->i_wanted_magazine, p_sys->i_wanted_page,
228 p_sys->b_ignore_sub_flag );
229
230 return VLC_SUCCESS;
231
232 /* error: */
233 /* if (p_sys) { */
234 /* free(p_sys); */
235 /* p_sys = NULL; */
236 /* } */
237 /* return VLC_EGENERIC; */
238 }
239
240 /*****************************************************************************
241 * Close:
242 *****************************************************************************/
Close(vlc_object_t * p_this)243 static void Close( vlc_object_t *p_this )
244 {
245 decoder_t *p_dec = (decoder_t*) p_this;
246 decoder_sys_t *p_sys = p_dec->p_sys;
247
248 free( p_sys );
249 }
250
251 /**************************
252 * change bits endianness *
253 **************************/
bytereverse(int n)254 static uint8_t bytereverse( int n )
255 {
256 n = (((n >> 1) & 0x55) | ((n << 1) & 0xaa));
257 n = (((n >> 2) & 0x33) | ((n << 2) & 0xcc));
258 n = (((n >> 4) & 0x0f) | ((n << 4) & 0xf0));
259 return n;
260 }
261
hamming_8_4(int a)262 static int hamming_8_4( int a )
263 {
264 switch (a) {
265 case 0xA8:
266 return 0;
267 case 0x0B:
268 return 1;
269 case 0x26:
270 return 2;
271 case 0x85:
272 return 3;
273 case 0x92:
274 return 4;
275 case 0x31:
276 return 5;
277 case 0x1C:
278 return 6;
279 case 0xBF:
280 return 7;
281 case 0x40:
282 return 8;
283 case 0xE3:
284 return 9;
285 case 0xCE:
286 return 10;
287 case 0x6D:
288 return 11;
289 case 0x7A:
290 return 12;
291 case 0xD9:
292 return 13;
293 case 0xF4:
294 return 14;
295 case 0x57:
296 return 15;
297 default:
298 return -1; // decoding error , not yet corrected
299 }
300 }
301
302 // utc-2 --> utf-8
303 // this is not a general function, but it's enough for what we do here
304 // the result buffer need to be at least 4 bytes long
to_utf8(char * res,uint16_t ch)305 static void to_utf8( char * res, uint16_t ch )
306 {
307 if( ch >= 0x80 )
308 {
309 if( ch >= 0x800 )
310 {
311 res[0] = (ch >> 12) | 0xE0;
312 res[1] = ((ch >> 6) & 0x3F) | 0x80;
313 res[2] = (ch & 0x3F) | 0x80;
314 res[3] = 0;
315 }
316 else
317 {
318 res[0] = (ch >> 6) | 0xC0;
319 res[1] = (ch & 0x3F) | 0x80;
320 res[2] = 0;
321 }
322 }
323 else
324 {
325 res[0] = ch;
326 res[1] = 0;
327 }
328 }
329
decode_string(char * res,int res_len,decoder_sys_t * p_sys,int magazine,uint8_t * packet,int len)330 static void decode_string( char * res, int res_len,
331 decoder_sys_t *p_sys, int magazine,
332 uint8_t * packet, int len )
333 {
334 char utf8[7];
335 char * pt = res;
336
337 for ( int i = 0; i < len; i++ )
338 {
339 int in = bytereverse( packet[i] ) & 0x7f;
340 uint16_t out = 32;
341 size_t l;
342
343 switch ( in )
344 {
345 /* special national characters */
346 case 0x23:
347 out = p_sys->pi_active_national_set[magazine][0];
348 break;
349 case 0x24:
350 out = p_sys->pi_active_national_set[magazine][1];
351 break;
352 case 0x40:
353 out = p_sys->pi_active_national_set[magazine][2];
354 break;
355 case 0x5b:
356 out = p_sys->pi_active_national_set[magazine][3];
357 break;
358 case 0x5c:
359 out = p_sys->pi_active_national_set[magazine][4];
360 break;
361 case 0x5d:
362 out = p_sys->pi_active_national_set[magazine][5];
363 break;
364 case 0x5e:
365 out = p_sys->pi_active_national_set[magazine][6];
366 break;
367 case 0x5f:
368 out = p_sys->pi_active_national_set[magazine][7];
369 break;
370 case 0x60:
371 out = p_sys->pi_active_national_set[magazine][8];
372 break;
373 case 0x7b:
374 out = p_sys->pi_active_national_set[magazine][9];
375 break;
376 case 0x7c:
377 out = p_sys->pi_active_national_set[magazine][10];
378 break;
379 case 0x7d:
380 out = p_sys->pi_active_national_set[magazine][11];
381 break;
382 case 0x7e:
383 out = p_sys->pi_active_national_set[magazine][12];
384 break;
385
386 /* some special control characters (empirical) */
387 case 0x0d:
388 /* apparently this starts a sequence that ends with 0xb 0xb */
389 while ( i + 1 < len && (bytereverse( packet[i+1] ) & 0x7f) != 0x0b )
390 i++;
391 i += 2;
392 break;
393 /* goto skip; */
394
395 default:
396 /* non documented national range 0x08 - 0x0f */
397 if ( in >= 0x08 && in <= 0x0f )
398 {
399 out = p_sys->pi_active_national_set[magazine][13 + in - 8];
400 break;
401 }
402
403 /* normal ascii */
404 if ( in > 32 && in < 0x7f )
405 out = in;
406 }
407
408 /* handle undefined national characters */
409 if ( out == 0 )
410 out = 32;
411
412 /* convert to utf-8 */
413 to_utf8( utf8, out );
414 l = strlen( utf8 );
415 if ( pt + l < res + res_len - 1 )
416 {
417 strcpy(pt, utf8);
418 pt += l;
419 }
420
421 /* skip: ; */
422 }
423 /* end: */
424 *pt++ = 0;
425 }
426
427 /*****************************************************************************
428 * Decode:
429 *****************************************************************************/
Decode(decoder_t * p_dec,block_t * p_block)430 static int Decode( decoder_t *p_dec, block_t *p_block )
431 {
432 decoder_sys_t *p_sys = p_dec->p_sys;
433 subpicture_t *p_spu = NULL;
434 video_format_t fmt;
435 /* int erase = 0; */
436 int len;
437 #if 0
438 int i_wanted_magazine = i_conf_wanted_page / 100;
439 int i_wanted_page = 0x10 * ((i_conf_wanted_page % 100) / 10)
440 | (i_conf_wanted_page % 10);
441 #endif
442 bool b_update = false;
443 char psz_text[512], *pt = psz_text;
444 char psz_line[256];
445 int total;
446
447 if( p_block == NULL ) /* No Drain */
448 return VLCDEC_SUCCESS;
449
450 dbg((p_dec, "start of telx packet with header %2x\n",
451 * (uint8_t *) p_block->p_buffer));
452 len = p_block->i_buffer;
453 for ( int offset = 1; offset + 46 <= len; offset += 46 )
454 {
455 uint8_t * packet = (uint8_t *) p_block->p_buffer+offset;
456 // int vbi = ((0x20 & packet[2]) != 0 ? 0 : 313) + (0x1F & packet[2]);
457
458 // dbg((p_dec, "vbi %d header %02x %02x %02x\n", vbi, packet[0], packet[1], packet[2]));
459 if ( packet[0] == 0xFF ) continue;
460
461 /* if (packet[1] != 0x2C) { */
462 /* printf("wrong header\n"); */
463 /* //goto error; */
464 /* continue; */
465 /* } */
466
467 int mpag = (hamming_8_4( packet[4] ) << 4) | hamming_8_4( packet[5] );
468 int row, magazine;
469 if ( mpag < 0 )
470 {
471 /* decode error */
472 dbg((p_dec, "mpag hamming error\n"));
473 continue;
474 }
475
476 row = 0xFF & bytereverse(mpag);
477 magazine = (7 & row) == 0 ? 8 : (7 & row);
478 row >>= 3;
479
480 if ( p_sys->i_wanted_page != -1
481 && magazine != p_sys->i_wanted_magazine )
482 continue;
483
484 if ( row == 0 )
485 {
486 /* row 0 : flags and header line */
487 int flag = 0;
488
489 for ( int a = 0; a < 6; a++ )
490 {
491 flag |= (0xF & (bytereverse( hamming_8_4(packet[8 + a]) ) >> 4))
492 << (a * 4);
493 }
494
495 /* if (!p_sys->b_ignore_sub_flag && !(1 & flag>>15)) */
496 /* continue; */
497
498 p_sys->i_page[magazine] = (0xF0 & bytereverse( hamming_8_4(packet[7]) )) |
499 (0xF & (bytereverse( hamming_8_4(packet[6]) ) >> 4) );
500
501 decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
502 packet + 14, 40 - 14 );
503
504 dbg((p_dec, "mag %d flags %x page %x character set %d subtitles %d", magazine, flag,
505 p_sys->i_page[magazine],
506 7 & flag>>21, 1 & flag>>15, psz_line));
507
508 p_sys->pi_active_national_set[magazine] =
509 ppi_national_subsets[7 & (flag >> 21)];
510
511 p_sys->b_is_subtitle[magazine] = p_sys->b_ignore_sub_flag
512 || ( (1 & (flag >> 15))
513 && (1 & (flag>>16)) );
514
515 dbg(( p_dec, "FLAGS%s%s%s%s%s%s%s mag_ser %d",
516 (1 & (flag>>14))? " news" : "",
517 (1 & (flag>>15))? " subtitle" : "",
518 (1 & (flag>>7))? " erase" : "",
519 (1 & (flag>>16))? " suppressed_head" : "",
520 (1 & (flag>>17))? " update" : "",
521 (1 & (flag>>18))? " interrupt" : "",
522 (1 & (flag>>19))? " inhibit" : "",
523 (1 & (flag>>20)) ));
524
525 if ( (p_sys->i_wanted_page != -1
526 && p_sys->i_page[magazine] != p_sys->i_wanted_page)
527 || !p_sys->b_is_subtitle[magazine] )
528 continue;
529
530 p_sys->b_erase[magazine] = (1 & (flag >> 7));
531
532 dbg((p_dec, "%ld --> %ld\n", (long int) p_block->i_pts, (long int)(p_sys->prev_pts+1500000)));
533 /* kludge here :
534 * we ignore the erase flag if it happens less than 1.5 seconds
535 * before last caption
536 * TODO make this time configurable
537 * UPDATE the kludge seems to be no more necessary
538 * so it's commented out*/
539 if ( /*p_block->i_pts > p_sys->prev_pts + 1500000 && */
540 p_sys->b_erase[magazine] )
541 {
542 dbg((p_dec, "ERASE !\n"));
543
544 p_sys->b_erase[magazine] = 0;
545 for ( int i = 1; i < 32; i++ )
546 {
547 if ( !p_sys->ppsz_lines[i][0] ) continue;
548 /* b_update = true; */
549 p_sys->ppsz_lines[i][0] = 0;
550 }
551 }
552
553 /* replace the row if it's different */
554 if ( strcmp(psz_line, p_sys->ppsz_lines[row]) )
555 {
556 strncpy( p_sys->ppsz_lines[row], psz_line,
557 sizeof(p_sys->ppsz_lines[row]) - 1);
558 }
559 b_update = true;
560
561 }
562 else if ( row < 24 )
563 {
564 char * t;
565 int i;
566 /* row 1-23 : normal lines */
567
568 if ( (p_sys->i_wanted_page != -1
569 && p_sys->i_page[magazine] != p_sys->i_wanted_page)
570 || !p_sys->b_is_subtitle[magazine]
571 || (p_sys->i_wanted_page == -1
572 && p_sys->i_page[magazine] > 0x99) )
573 continue;
574
575 decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
576 packet + 6, 40 );
577 t = psz_line;
578
579 /* remove starting spaces */
580 while ( *t == 32 ) t++;
581
582 /* remove trailing spaces */
583 for ( i = strlen(t) - 1; i >= 0 && t[i] == 32; i-- );
584 t[i + 1] = 0;
585
586 /* replace the row if it's different */
587 if ( strcmp( t, p_sys->ppsz_lines[row] ) )
588 {
589 strncpy( p_sys->ppsz_lines[row], t,
590 sizeof(p_sys->ppsz_lines[row]) - 1 );
591 b_update = true;
592 }
593
594 if (t[0])
595 p_sys->prev_pts = p_block->i_pts;
596
597 dbg((p_dec, "%d %d : ", magazine, row));
598 dbg((p_dec, "%s\n", t));
599
600 #ifdef TELX_DEBUG
601 {
602 char dbg[256];
603 dbg[0] = 0;
604 for ( i = 0; i < 40; i++ )
605 {
606 int in = bytereverse(packet[6 + i]) & 0x7f;
607 sprintf(dbg + strlen(dbg), "%02x ", in);
608 }
609 dbg((p_dec, "%s\n", dbg));
610 dbg[0] = 0;
611 for ( i = 0; i < 40; i++ )
612 {
613 decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
614 packet + 6 + i, 1 );
615 sprintf( dbg + strlen(dbg), "%s ", psz_line );
616 }
617 dbg((p_dec, "%s\n", dbg));
618 }
619 #endif
620 }
621 else if ( row == 25 )
622 {
623 /* row 25 : alternate header line */
624 if ( (p_sys->i_wanted_page != -1
625 && p_sys->i_page[magazine] != p_sys->i_wanted_page)
626 || !p_sys->b_is_subtitle[magazine] )
627 continue;
628
629 decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
630 packet + 6, 40 );
631
632 /* replace the row if it's different */
633 if ( strcmp( psz_line, p_sys->ppsz_lines[0] ) )
634 {
635 strncpy( p_sys->ppsz_lines[0], psz_line,
636 sizeof(p_sys->ppsz_lines[0]) - 1 );
637 /* b_update = true; */
638 }
639 }
640 /* else if (row == 26) { */
641 /* // row 26 : TV listings */
642 /* } else */
643 /* dbg((p_dec, "%d %d : %s\n", magazine, row, decode_string(p_sys, magazine, packet+6, 40))); */
644 }
645
646 if ( !b_update )
647 goto error;
648
649 total = 0;
650 for ( int i = 1; i < 24; i++ )
651 {
652 size_t l = strlen( p_sys->ppsz_lines[i] );
653
654 if ( l > sizeof(psz_text) - total - 1 )
655 l = sizeof(psz_text) - total - 1;
656
657 if ( l > 0 )
658 {
659 memcpy( pt, p_sys->ppsz_lines[i], l );
660 total += l;
661 pt += l;
662 if ( sizeof(psz_text) - total - 1 > 0 )
663 {
664 *pt++ = '\n';
665 total++;
666 }
667 }
668 }
669 *pt = 0;
670
671 if ( !strcmp(psz_text, p_sys->psz_prev_text) )
672 goto error;
673
674 dbg((p_dec, "UPDATE TELETEXT PICTURE\n"));
675
676 assert( sizeof(p_sys->psz_prev_text) >= sizeof(psz_text) );
677 strcpy( p_sys->psz_prev_text, psz_text );
678
679 /* Create the subpicture unit */
680 p_spu = decoder_NewSubpicture( p_dec, NULL );
681 if( !p_spu )
682 {
683 msg_Warn( p_dec, "can't get spu buffer" );
684 goto error;
685 }
686
687 /* Create a new subpicture region */
688 video_format_Init(&fmt, VLC_CODEC_TEXT);
689 fmt.i_width = fmt.i_height = 0;
690 fmt.i_x_offset = fmt.i_y_offset = 0;
691 p_spu->p_region = subpicture_region_New( &fmt );
692 if( p_spu->p_region == NULL )
693 {
694 msg_Err( p_dec, "cannot allocate SPU region" );
695 goto error;
696 }
697
698 /* Normal text subs, easy markup */
699 p_spu->p_region->i_align = SUBPICTURE_ALIGN_BOTTOM | p_sys->i_align;
700 p_spu->p_region->i_x = p_sys->i_align ? 20 : 0;
701 p_spu->p_region->i_y = 10;
702 p_spu->p_region->p_text = text_segment_New(psz_text);
703
704 p_spu->i_start = p_block->i_pts;
705 p_spu->i_stop = p_block->i_pts + p_block->i_length;
706 p_spu->b_ephemer = (p_block->i_length == 0);
707 p_spu->b_absolute = false;
708 dbg((p_dec, "%ld --> %ld\n", (long int) p_block->i_pts/100000, (long int)p_block->i_length/100000));
709
710 block_Release( p_block );
711 if( p_spu != NULL )
712 decoder_QueueSub( p_dec, p_spu );
713 return VLCDEC_SUCCESS;
714
715 error:
716 if ( p_spu != NULL )
717 {
718 subpicture_Delete( p_spu );
719 p_spu = NULL;
720 }
721
722 block_Release( p_block );
723 return VLCDEC_SUCCESS;
724 }
725