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1/*
2 * libzvbi -- Closed Caption decoder
3 *
4 * Copyright (C) 2000, 2001, 2002 Michael H. Schimek
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library 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 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301 USA.
20 */
21
22/* $Id: caption.c,v 1.28 2008/02/24 14:18:03 mschimek Exp $ */
23
24#ifdef HAVE_CONFIG_H
25# include "config.h"
26#endif
27
28#include <unistd.h>
29
30#include "misc.h"
31#include "trigger.h"
32#include "format.h"
33#include "lang.h"
34#include "hamm.h"
35#include "tables.h"
36#include "vbi.h"
37#include <android/log.h>
38#include "am_debug.h"
39
40#define elements(array) (sizeof(array) / sizeof(array[0]))
41
42#define LOG_TAG "ZVBI"
43#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
44#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
45
46
47#define ITV_DEBUG(x) /* x */
48#define XDS_SEP_DEBUG /* x */ printf
49#define XDS_SEP_DUMP(x) /* x */
50#define CC_DUMP(x) /* x */
51#define CC_TEXT_DUMP(x) /* x */
52
53static inline void
54caption_send_event(vbi_decoder *vbi, vbi_event *ev)
55{
56 /* Permits calling vbi_fetch_cc_page from handler */
57 pthread_mutex_unlock(&vbi->cc.mutex);
58
59 vbi_send_event(vbi, ev);
60
61 pthread_mutex_lock(&vbi->cc.mutex);
62}
63
64/*
65 * XDS (Extended Data Service) decoder
66 */
67
68#define XDS_CURRENT 0
69#define XDS_FUTURE 1
70#define XDS_CHANNEL 2
71#define XDS_MISC 3
72#define XDS_PUBLIC_SERVICE 4
73#define XDS_RESERVED 5
74#define XDS_UNDEFINED 6 /* proprietary format */
75
76#define XDS_END 15
77
78/* vbi_classify_page, program_info language */
79static const char *
80language[8] = {
81 "Unknown",
82 "English",
83 "Español",
84 "Français",
85 "Deutsch",
86 "Italiano",
87 "Other",
88 "None"
89};
90
91static uint32_t hcrc[128];
92
93static void init_hcrc(void) __attribute__ ((constructor));
94
95
96/*
97http://www.fcc.gov/cgb/statid.html
98 *
99 * XDS has no unique station id as EBU (or is the call sign?)
100 * so we create a checksum over the station name.
101 */
102static void
103init_hcrc(void)
104{
105 unsigned int sum;
106 int i, j;
107
108 for (i = 0; i < 128; i++) {
109 sum = 0;
110 for (j = 7 - 1; j >= 0; j--)
111 if (i & (1 << j))
112 sum ^= 0x48000000L >> j;
113 hcrc[i] = sum;
114 }
115}
116
117static int
118xds_strfu(signed char *d, const uint8_t *s, int len)
119{
120 int c, neq = 0;
121
122 for (; len > 0 && *s <= 0x20; s++, len--);
123
124 for (; len > 0; s++, len--) {
125 c = MAX((uint8_t) 0x20, *s);
126 neq |= *d ^ c;
127 *d++ = c;
128 }
129
130 neq |= *d;
131 *d = 0;
132
133 return neq;
134}
135
136#define xds_intfu(d, val) (neq |= d ^ (val), d = (val))
137
138static void
139flush_prog_info(vbi_decoder *vbi, vbi_program_info *pi, vbi_event *e)
140{
141 e->ev.aspect = pi->aspect;
142
143 vbi_reset_prog_info(pi);
144
145 if (memcmp(&e->ev.aspect, &pi->aspect, sizeof(pi->aspect)) != 0) {
146 e->type = VBI_EVENT_ASPECT;
147 caption_send_event(vbi, e);
148 }
149
150 vbi->cc.info_cycle[pi->future] = 0;
151}
152
153static inline void
154xds_decoder(vbi_decoder *vbi, int _class, int type,
155 uint8_t *buffer, int length)
156{
157 XDS_SEP_DEBUG("xds_decoder _class = %d,type = %d, buffer[0]=%02x, buffer[1]=%02x length = %d,\n",_class ,type,buffer[0], buffer[1],length);
158 vbi_network *n = &vbi->network.ev.network;
159 vbi_program_info *pi;
160 int neq, i;
161 vbi_event e;
162
163 if ((length <= 0) || (length > 32))
164 return;
165 //assert(length > 0 && length <= 32);
166
167// XXX we have no indication how long the program info applies.
168// It will be canceled on channel switch, but who knows
169// what the station transmits when the next program starts.
170// (Nothing, possibly.) A timeout seems necessary.
171
172 switch (_class) {
173 case XDS_CURRENT: /* 0 */
174 case XDS_FUTURE: /* 1 */
175 if (!(vbi->event_mask & (VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO | VBI_EVENT_RATING))){
176 XDS_SEP_DEBUG("vbi->event_mask & VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO");
177 return;
178 }
179 pi = &vbi->prog_info[_class];
180 neq = 0;
181
182 switch (type) {
183 case 1: /* program identification number */
184 {
185 int month, day, hour, min;
186
187 if (length != 4)
188 return;
189
190 month = buffer[3] & 15;
191 day = buffer[2] & 31;
192 hour = buffer[1] & 31;
193 min = buffer[0] & 63;
194
195 if (month == 0 || month > 12
196 || day == 0 || day > 31
197 || hour > 23 || min > 59)
198 return;
199
200 month--;
201 day--;
202
203 neq = (pi->month ^ month) | (pi->day ^ day)
204 | (pi->hour ^ hour) | (pi->min ^ min);
205
206 pi->tape_delayed = !!(buffer[3] & 0x10);
207
208 if (neq) {
209 flush_prog_info(vbi, pi, &e);
210
211 pi->month = month;
212 pi->day = day;
213 pi->hour = hour;
214 pi->min = min;
215
216 pi->tape_delayed = !!(buffer[3] & 0x10);
217 }
218
219 break;
220 }
221
222 case 2: /* program length */
223 {
224 int lhour, lmin, ehour = -1, emin = -1, esec = 0;
225
226 if (length < 2 || length > 6)
227 return;
228
229 lhour = buffer[1] & 63;
230 lmin = buffer[0] & 63;
231
232 if (length >= 3) {
233 ehour = buffer[3] & 63;
234 emin = buffer[2] & 63;
235
236 if (length >= 5)
237 esec = buffer[4] & 63;
238 }
239
240 if (lmin > 59 || emin > 59 || esec > 59)
241 return;
242
243 xds_intfu(pi->length_hour, lhour);
244 xds_intfu(pi->length_min, lmin);
245 xds_intfu(pi->elapsed_hour, ehour);
246 xds_intfu(pi->elapsed_min, emin);
247 xds_intfu(pi->elapsed_sec, esec);
248
249 break;
250 }
251
252 case 3: /* program name */
253 if (length < 2)
254 return;
255
256 neq = xds_strfu(pi->title, buffer, length);
257
258 if (!neq) { /* no title change */
259 if (!(vbi->cc.info_cycle[_class] & (1 << 3)))
260 break; /* already reported */
261
262 if (!(vbi->cc.info_cycle[_class] & (1 << 1))) {
263 /* Second occurence without PIN */
264
265 flush_prog_info(vbi, pi, &e);
266
267 xds_strfu(pi->title, buffer, length);
268 vbi->cc.info_cycle[_class] |= 1 << 3;
269 }
270 }
271
272 break;
273
274 case 4: /* program type */
275 {
276 int neq;
277
278 neq = (pi->type_classf != VBI_PROG_CLASSF_EIA_608);
279 pi->type_classf = VBI_PROG_CLASSF_EIA_608;
280
281 for (i = 0; i < length; i++) {
282 neq |= pi->type_id[i] ^ buffer[i];
283 pi->type_id[i] = buffer[i];
284 }
285
286 neq |= pi->type_id[i];
287 pi->type_id[i] = 0;
288
289 break;
290 }
291
292 case 5: /* program rating */
293 {
294 vbi_rating_auth auth;
295 int r, g, dlsv = 0;
296
297 if (length != 2)
298 return;
299
300 r = buffer[0] & 7;
301 g = buffer[1] & 7;
302 XDS_SEP_DEBUG("r = %d,g = %d\n",r,g);
303 if (buffer[0] & 0x20)
304 dlsv |= VBI_RATING_D;
305 if (buffer[1] & 0x08)
306 dlsv |= VBI_RATING_L;
307 if (buffer[1] & 0x10)
308 dlsv |= VBI_RATING_S;
309 if (buffer[1] & 0x20)
310 dlsv |= VBI_RATING_V;
311
312 if ((buffer[0] & 0x08) == 0) {
313 //if (r == 0) return;
314 auth = VBI_RATING_AUTH_MPAA;
315 pi->rating.dlsv = dlsv = 0;
316 } else if ((buffer[0] & 0x10) == 0) {
317 auth = VBI_RATING_AUTH_TV_US;
318 r = g;
319 } else if ((buffer[1] & 0x08) == 0) {
320 if ((buffer[0] & 0x20) == 0) {
321 if ((r = g) > 6) return;
322 auth = VBI_RATING_AUTH_TV_CA_EN;
323 } else {
324 if ((r = g) > 5) return;
325 auth = VBI_RATING_AUTH_TV_CA_FR;
326 }
327 pi->rating.dlsv = dlsv = 0;
328 } else
329 return;
330
331 if ((neq = (pi->rating.auth != auth
332 || pi->rating.id != r
333 || pi->rating.dlsv != dlsv))) {
334 pi->rating.auth = auth;
335 pi->rating.id = r;
336 pi->rating.dlsv = dlsv;
337 }
338 if (vbi->event_mask & VBI_EVENT_RATING){
339 e.type = VBI_EVENT_RATING;
340 e.ev.prog_info = pi;
341 caption_send_event(vbi, &e);
342 }
343
344 break;
345 }
346
347 case 6: /* program audio services */
348 {
349 static const vbi_audio_mode mode[2][8] = {
350 {
351 VBI_AUDIO_MODE_UNKNOWN,
352 VBI_AUDIO_MODE_MONO,
353 VBI_AUDIO_MODE_SIMULATED_STEREO,
354 VBI_AUDIO_MODE_STEREO,
355 VBI_AUDIO_MODE_STEREO_SURROUND,
356 VBI_AUDIO_MODE_DATA_SERVICE,
357 VBI_AUDIO_MODE_UNKNOWN, /* "other" */
358 VBI_AUDIO_MODE_NONE
359 }, {
360 VBI_AUDIO_MODE_UNKNOWN,
361 VBI_AUDIO_MODE_MONO,
362 VBI_AUDIO_MODE_VIDEO_DESCRIPTIONS,
363 VBI_AUDIO_MODE_NON_PROGRAM_AUDIO,
364 VBI_AUDIO_MODE_SPECIAL_EFFECTS,
365 VBI_AUDIO_MODE_DATA_SERVICE,
366 VBI_AUDIO_MODE_UNKNOWN, /* "other" */
367 VBI_AUDIO_MODE_NONE
368 }
369 };
370
371 if (length != 2)
372 return;
373
374 for (i = 0; i < 2; i++) {
375 int l = (buffer[i] >> 3) & 7;
376 vbi_audio_mode m = mode[i][buffer[i] & 7];
377 /* should be const char *, but I got that
378 wrong and cannot change the public
379 pi->audio[].language type now. */
380 unsigned char *s = ((1 << l) & 0xC1) ? NULL :
381 (unsigned char *) language[l];
382
383 if (pi->audio[i].mode != m) {
384 neq = 1; pi->audio[i].mode = m;
385 }
386 if (pi->audio[i].language != s) {
387 neq = 1; pi->audio[i].language = s;
388 }
389 }
390
391 break;
392 }
393
394 case 7: /* program caption services */
395 {
396 int services = 0;
397
398 if (length > 8)
399 return;
400
401 for (i = 0; i < 8; i++)
402 pi->caption_language[i] = NULL;
403
404 for (i = 0; i < length; i++) {
405 int ch = buffer[i] & 7;
406 int l = (buffer[i] >> 3) & 7;
407 /* should be const char *, but I got that
408 wrong and cannot change the public
409 pi->audio[].language type now. */
410 unsigned char *s;
411
412 ch = (ch & 1) * 4 + (ch >> 1);
413
414 services |= 1 << ch;
415 s = ((1 << l) & 0xC1) ? NULL :
416 (unsigned char *) language[l];
417
418 if (pi->caption_language[ch] != (unsigned char *) s) {
419 neq = 1; pi->caption_language[ch] = (unsigned char *) s;
420 }
421
422 if (_class == XDS_CURRENT)
423 vbi->cc.channel[ch].language =
424 pi->caption_language[ch];
425 }
426
427 xds_intfu(pi->caption_services, services);
428
429 break;
430 }
431
432 case 8: /* copy generation management system */
433 if (length != 1)
434 return;
435
436 xds_intfu(pi->cgms_a, buffer[0] & 63);
437
438 break;
439
440 case 9: /* program aspect ratio */
441 {
442 vbi_aspect_ratio *r = &e.ev.aspect;
443
444 if (length > 3)
445 return;
446
447 memset(&e, 0, sizeof(e));
448
449 r->first_line = (buffer[0] & 63) + 22;
450 r->last_line = 262 - (buffer[1] & 63);
451 r->film_mode = 0;
452 r->open_subtitles = VBI_SUBT_UNKNOWN;
453
454 if (length >= 3 && (buffer[2] & 1))
455 r->ratio = 16.0 / 9.0;
456 else
457 r->ratio = 1.0;
458
459 if (memcmp(r, &vbi->prog_info[0].aspect, sizeof(*r)) != 0) {
460 vbi->prog_info[0].aspect = *r;
461 vbi->aspect_source = 3;
462
463 e.type = VBI_EVENT_ASPECT;
464 caption_send_event(vbi, &e);
465
466 neq = 1;
467 }
468
469 break;
470 }
471
472 case 0x10 ... 0x17: /* program description */
473 {
474 int line = type & 7;
475
476 neq = xds_strfu(pi->description[line], buffer, length);
477
478 break;
479 }
480
481 default:
482 return; /* no event */
483 }
484
485 if (0)
486 printf("[type %d cycle %08x class %d neq %d]\n",
487 type, vbi->cc.info_cycle[_class], _class, neq);
488
489 if (neq){ /* first occurence of this type with this data */
490 vbi->cc.info_cycle[_class] |= 1 << type;
491 }
492 else if (vbi->cc.info_cycle[_class] & (1 << type)) {
493 /* Second occurance of this type with same data */
494
495 e.type = VBI_EVENT_PROG_INFO;
496 e.ev.prog_info = pi;
497
498 caption_send_event(vbi, &e);
499 XDS_SEP_DEBUG("caption_send_event VBI_EVENT_PROG_INFO\n");
500 vbi->cc.info_cycle[_class] = 0; /* all changes reported */
501 }
502
503 break;
504
505 case XDS_CHANNEL:
506 n->ts_id = -1;
507
508 switch (type) {
509 case 1: /* network name */
510 if (xds_strfu(n->name, buffer, length)) {
511 n->cycle = 1;
512 } else if (n->cycle == 1) {
513 signed char *s = n->name;
514 uint32_t sum;
515
516 if (n->call[0])
517 s = n->call;
518
519 for (sum = 0; *s; s++)
520 sum = (sum >> 7) ^ hcrc[(sum ^ *s) & 0x7F];
521
522 sum &= ((1UL << 31) - 1);
523 sum |= 1UL << 30;
524
525 if (n->nuid != 0)
526 vbi_chsw_reset(vbi, sum);
527
528 n->nuid = sum;
529
530 vbi->network.type = VBI_EVENT_NETWORK;
531 caption_send_event(vbi, &vbi->network);
532
533 vbi->network.type = VBI_EVENT_NETWORK_ID;
534 caption_send_event(vbi, &vbi->network);
535
536 n->cycle = 3;
537 }
538
539 break;
540
541 case 2: /* network call letters */
542 if (xds_strfu(n->call, buffer, length)) {
543 if (n->cycle != 1) {
544 n->name[0] = 0;
545 n->cycle = 0;
546 }
547 }
548
549 break;
550
551 case 3: /* channel tape delay */
552 if (length != 2)
553 return;
554
555 n->tape_delay =
556 (buffer[1] & 31) * 60 + (buffer[0] & 63);
557
558 break;
559
560 case 4: /* Transmission Signal ID */
561 if (length < 4)
562 return;
563
564 n->ts_id =
565 ((buffer[3] & 15) << 0)
566 |((buffer[2] & 15) << 4)
567 |((buffer[1] & 15) << 8)
568 |((buffer[0] & 15) << 12);
569
570 vbi->network.type = VBI_EVENT_NETWORK;
571 caption_send_event(vbi, &vbi->network);
572 break;
573
574 default:
575 break;
576 }
577
578 break;
579
580 case XDS_MISC:
581 switch (type) {
582 case 1: /* time of day */
583 if (length != 6)
584 return;
585 break;
586
587 case 2: /* impulse capture id */
588 if (length != 6)
589 return;
590 break;
591
592 case 3: /* supplemental data location */
593 break;
594
595 case 4: /* local time zone */
596 if (length != 1)
597 return;
598 break;
599
600 case 0x40: /* out-of-band channel number */
601 if (length != 2)
602 return;
603 break;
604
605 default:
606 break;
607 }
608
609 break;
610
611 default:
612 break;
613 }
614}
615
616static void
617xds_separator(vbi_decoder *vbi, uint8_t *buf)
618{
619 struct caption *cc = &vbi->cc;
620 xds_sub_packet *sp = cc->curr_sp;
621 int c1 = vbi_unpar8 (buf[0]);
622 int c2 = vbi_unpar8 (buf[1]);
623 unsigned int class, type;
624
625 XDS_SEP_DEBUG("XDS %02x %02x\n", buf[0], buf[1]);
626
627 if ((c1 | c2) < 0) {
628 XDS_SEP_DEBUG("XDS tx error, discard current packet\n");
629
630 if (sp) {
631 sp->count = 0;
632 sp->chksum = 0;
633 sp = NULL;
634 }
635
636 return;
637 }
638
639 switch (c1) {
640 case 1 ... 14:
641 class = (c1 - 1) >> 1;
642
643 if (class > elements(cc->sub_packet)
644 || c2 > (int) elements(cc->sub_packet[0])) {
645 XDS_SEP_DEBUG("XDS ignore packet %d/0x%02x\n", class, c2);
646 cc->curr_sp = NULL;
647 return;
648 }
649
650 cc->curr_sp = sp = &cc->sub_packet[class][c2];
651
652 if (c1 & 1) { /* start */
653 sp->chksum = c1 + c2;
654 sp->count = 2;
655 } else if (!sp->count) {
656 XDS_SEP_DEBUG("XDS can't continue %d/0x%02x\n", class, c2);
657 cc->curr_sp = NULL;
658 }
659
660 return;
661
662 case 15:
663 if (!sp)
664 return;
665
666 sp->chksum += c1 + c2;
667
668 class = (sp - cc->sub_packet[0]) / elements(cc->sub_packet[0]);
669 type = (sp - cc->sub_packet[0]) % elements(cc->sub_packet[0]);
670
671 if (sp->chksum & 0x7F) {
672 XDS_SEP_DEBUG("XDS ignore packet %d/0x%02x, "
673 "checksum error\n", class, type);
674 } else if (sp->count <= 2) {
675 XDS_SEP_DEBUG("XDS ignore empty packet "
676 "%d/0x%02x\n", class, type);
677 } else {
678 xds_decoder(vbi, class, type, sp->buffer, sp->count - 2);
679
680 XDS_SEP_DUMP(
681 for (i = 0; i < sp->count - 2; i++)
682 printf("%c", (sp->buffer[i])); //printf("%c", _vbi_to_ascii (sp->buffer[i]));
683 printf(" %d/0x%02x\n", class, type);
684 )
685 }
686
687 sp->count = 0;
688 sp->chksum = 0;
689 cc->curr_sp = NULL;
690
691 return;
692
693 case 0x20 ... 0x7F:
694 if (!sp)
695 return;
696
697 if (sp->count >= 32 + 2) {
698 XDS_SEP_DEBUG("XDS packet length overflow, discard %d/0x%02x\n",
699 (sp - cc->sub_packet[0]) / elements(cc->sub_packet[0]),
700 (sp - cc->sub_packet[0]) % elements(cc->sub_packet[0]));
701
702 sp->count = 0;
703 sp->chksum = 0;
704 cc->curr_sp = NULL;
705 return;
706 }
707
708 sp->buffer[sp->count - 2] = c1;
709 sp->buffer[sp->count - 1] = c2;
710 sp->chksum += c1 + c2;
711 sp->count += 1 + !!c2;
712
713 return;
714
715 default:
716 assert(!"reached");
717 }
718}
719
720static void
721itv_separator(vbi_decoder *vbi, struct caption *cc, char c)
722{
723 if (ITV_DEBUG(0 &&) !(vbi->event_mask & VBI_EVENT_TRIGGER))
724 return;
725
726 if (c >= 0x20) {
727 if (c == '<') // s4-nbc omitted CR
728 itv_separator(vbi, cc, 0);
729 else if (cc->itv_count > (int) sizeof(cc->itv_buf) - 2)
730 cc->itv_count = 0;
731
732 cc->itv_buf[cc->itv_count++] = c;
733
734 return;
735 }
736
737 cc->itv_buf[cc->itv_count] = 0;
738 cc->itv_count = 0;
739
740 ITV_DEBUG(printf("ITV: <%s>\n", cc->itv_buf));
741
742 vbi_atvef_trigger(vbi, cc->itv_buf);
743}
744
745/*
746 * Closed Caption decoder
747 */
748
749#define ROWS 15
750#define COLUMNS 34
751
752static void
753render(cc_channel *ch)
754{
755 vbi_event event;
756
757 ch->pg[2] = ch->pg[ch->hidden ^ 1];
758
759 event.type = VBI_EVENT_CAPTION;
760 event.ev.caption.pgno = ch->pg[0].pgno;
761
762 caption_send_event(ch->pg[0].vbi, &event);
763}
764
765static inline void
766update(cc_channel *ch)
767{
768 ch->update_flag = 1;
769}
770
771static void
772word_break(struct caption *cc, cc_channel *ch, int upd)
773{
774 cc = cc;
775
776 /*
777 * Add a leading and trailing space.
778 */
779#if 0
780 if (ch->col > ch->col1) {
781 vbi_char c = ch->line[ch->col1];
782
783 if ((c.unicode & 0x7F) != 0x20
784 && ch->line[ch->col1 - 1].opacity == VBI_TRANSPARENT_SPACE) {
785 c.unicode = 0x20;
786 ch->line[ch->col1 - 1] = c;
787 }
788
789 c = ch->line[ch->col - 1];
790
791 if ((c.unicode & 0x7F) != 0x20
792 && ch->line[ch->col].opacity == VBI_TRANSPARENT_SPACE) {
793 c.unicode = 0x20;
794 ch->line[ch->col] = c;
795 }
796 }
797#endif
798 if (!upd || ch->mode == MODE_POP_ON)
799 return;
800
801 /*
802 * NB we render only at spaces (end of word) and
803 * before cursor motions and mode switching, to keep the
804 * drawing efforts (scaling etc) at a minimum. update()
805 * for double buffering at word granularity.
806 *
807 * XXX should not render if space follows space,
808 * but force in long words.
809 */
810 update(ch);
811}
812
813static void
814clear_roll(cc_channel *ch)
815{
816 int i;
817
818 for (i = 0; i < ROWS; i ++) {
819 if ((i >= ch->row1) && (i < ch->row1 + ch->roll))
820 continue;
821
822 memset(ch->pg[ch->hidden ^ 1].text + i * COLUMNS, 0, sizeof(vbi_char) * COLUMNS);
823 }
824}
825
826static void
827roll_up (cc_channel *ch, int roll)
828{
829 vbi_char *acp = ch->pg[ch->hidden ^ 1].text;
830
831 memmove(acp, acp + roll * COLUMNS, (ROWS - roll) * COLUMNS * sizeof(vbi_char));
832 memset(acp + (ROWS - roll) * COLUMNS, 0, roll * COLUMNS * sizeof(vbi_char));
833
834 ch->row1 -= roll;
835 ch->row -= roll;
836
837 if (ch->row1 < 0)
838 ch->row1 = 0;
839 if (ch->row < 0)
840 ch->row = 0;
841 clear_roll(ch);
842}
843
844static inline void
845set_cursor(cc_channel *ch, int col, int row)
846{
847 int p;
848 if (row < ch->row1) {
849 ch->row1 = row;
850 if (ch->mode == MODE_ROLL_UP) {
851 clear_roll(ch);
852 update(ch);
853 }
854 } else if (row >= ch->row1 + ch->roll) {
855 ch->row1 = row - ch->roll + 1;
856 if (ch->mode == MODE_ROLL_UP) {
857 clear_roll(ch);
858 update(ch);
859 }
860 }
861
862 ch->col = ch->col1 = col;
863 ch->row = row;
864
865 p = (ch->mode == MODE_POP_ON) ? ch->hidden : (ch->hidden ^ 1);
866 ch->line = ch->pg[p].text + row * COLUMNS;
867}
868
869static void
870set_char(cc_channel *ch, int col, vbi_char c)
871{
872 if (!ch->pos_flag)
873 return;
874
875 ch->line[col] = c;
876}
877
878static void
879put_char(struct caption *cc, cc_channel *ch, vbi_char c)
880{
881 /* c.foreground = rand() & 7; */
882 /* c.background = rand() & 7; */
883
884 if (ch->col < COLUMNS - 1) {
885 set_char(ch, ch->col, c);
886 ch->col ++;
887 } else {
888 /* line break here? */
889 set_char(ch, COLUMNS - 2, c);
890 }
891
892 if (ch->mode == MODE_POP_ON)
893 return;
894
895 update(ch);
896}
897
898static inline cc_channel *
899switch_channel(struct caption *cc, cc_channel *ch, int new_chan)
900{
901 return &cc->channel[cc->curr_chan = new_chan];
902}
903
904static void
905erase_memory(struct caption *cc, cc_channel *ch, int page)
906{
907 vbi_page *pg = ch->pg + page;
908
909 memset(pg->text, 0, ROWS * COLUMNS * sizeof(vbi_char));
910}
911
912static const vbi_color
913palette_mapping[8] = {
914 VBI_WHITE, VBI_GREEN, VBI_BLUE, VBI_CYAN,
915 VBI_RED, VBI_YELLOW, VBI_MAGENTA, VBI_BLACK
916};
917
918static int
919row_mapping[] = {
920 10, -1, 0, 1, 2, 3, 11, 12, 13, 14, 4, 5, 6, 7, 8, 9
921};
922
923// not verified means I didn't encounter the code in a
924// sample stream yet
925
926_vbi_inline void
927caption_command(vbi_decoder *vbi, struct caption *cc,
928 unsigned char c1, unsigned char c2, vbi_bool field2)
929{
930 XDS_SEP_DEBUG("caption_command\n");
931 cc_channel *ch;
932 vbi_char *c;
933 int chan, col, i;
934 int last_row;
935 chan = (cc->curr_chan & 4) + field2 * 2 + ((c1 >> 3) & 1);
936 ch = &cc->channel[chan];
937
938 c1 &= 7;
939
940 if (c2 >= 0x40) { /* Preamble Address Codes 001 crrr 1ri xxxu */
941 int row = row_mapping[(c1 << 1) + ((c2 >> 5) & 1)];
942 int old_row = ch->row;
943
944 if (row < 0 || !ch->mode)
945 return;
946
947 ch->pos_flag = 1;
948
949 ch->attr.underline = c2 & 1;
950 ch->attr.background = VBI_BLACK;
951 ch->attr.opacity = VBI_OPAQUE;
952 ch->attr.flash = FALSE;
953
954 word_break(cc, ch, 1);
955
956 if (ch->mode == MODE_ROLL_UP) {
957 int row1 = row - ch->roll + 1;
958 int roll;
959
960 if (row1 < 0)
961 row1 = 0;
962
963 roll = ch->row1 - row1;
964 if (roll > 0) {
965 roll_up(ch, ch->row1 - row1);
966 update(ch);
967 }
968 }
969
970 set_cursor(ch, 1, row);
971
972 if (c2 & 0x10) {
973 /*
974 col = ch->col;
975
976 for (i = (c2 & 14) * 2; i > 0 && col < COLUMNS - 1; i--)
977 ch->line[col++] = cc->transp_space[chan >> 2];
978
979 if (col > ch->col)
980 ch->col = ch->col1 = col;
981 */
982
983 ch->col = (c2 & 14) * 2 + 1;
984
985 if (old_row != ch->row) {
986 ch->attr.italic = FALSE;
987 ch->attr.foreground = VBI_WHITE;
988 }
989 } else {
990// not verified
991 c2 = (c2 >> 1) & 7;
992
993 if (c2 < 7) {
994 ch->attr.italic = FALSE;
995 ch->attr.foreground = palette_mapping[c2];
996 } else {
997 ch->attr.italic = TRUE;
998 ch->attr.foreground = VBI_WHITE;
999 }
1000 }
1001
1002 return;
1003 }
1004
1005 switch (c1) {
1006 case 0:
1007 /* Optional Attributes 001 c000 010 xxxt */
1008 ch->attr.opacity = (c2 & 1) ? VBI_SEMI_TRANSPARENT : VBI_OPAQUE;
1009 ch->attr.background = palette_mapping[(c2 >> 1) & 7];
1010
1011 for (i = 0; i < 2; i ++) {
1012 int col = ch->col - i;
1013
1014 if ((col > 0) && (col < COLUMNS - 1)) {
1015 vbi_char c = ch->line[col];
1016
1017 if (c.unicode == 0x20) {
1018 c.background = ch->attr.background;
1019 c.opacity = ch->attr.opacity;
1020 set_char(ch, col, c);
1021 }
1022 }
1023 }
1024 return;
1025
1026 case 1:
1027 if (c2 & 0x10) { /* Special Characters 001 c001 011 xxxx */
1028// not verified
1029 c2 &= 15;
1030
1031 if (c2 == 9) { // "transparent space"
1032 if (ch->col < COLUMNS - 1) {
1033 set_char(ch, ch->col++, cc->transp_space[chan >> 2]);
1034 ch->col1 = ch->col;
1035 } else {
1036 set_char(ch, COLUMNS - 2, cc->transp_space[chan >> 2]);
1037 }
1038
1039 } else {
1040 vbi_char c = ch->attr;
1041
1042 c.unicode = vbi_caption_unicode (0x1130 | (c2 & 15),
1043 /* to_upper */ FALSE);
1044 XDS_SEP_DEBUG("vbi_caption_unicode %c\n",c.unicode);
1045 put_char(cc, ch, c);
1046 }
1047 } else { /* Midrow Codes 001 c001 010 xxxu */
1048// not verified
1049 ch->attr.flash = FALSE;
1050 ch->attr.underline = c2 & 1;
1051
1052 c2 = (c2 >> 1) & 7;
1053
1054 if (c2 < 7) {
1055 ch->attr.italic = FALSE;
1056 ch->attr.foreground = palette_mapping[c2];
1057 } else {
1058 ch->attr.italic = TRUE;
1059 }
1060 }
1061
1062 return;
1063
1064 case 2: /* Optional Extended Characters 001 c01f 01x xxxx */
1065 case 3:
1066 /* Send specs to the maintainer of this code */
1067 {
1068 vbi_char c;
1069
1070 c = ch->attr;
1071 c.unicode = vbi_caption_unicode((c1 << 8) | c2 | 0x1000, 0);
1072
1073 if (c.unicode) {
1074 if (ch->col > 1)
1075 ch->col --;
1076
1077 put_char(cc, ch, c);
1078 }
1079 }
1080 return;
1081
1082 case 4: /* Misc Control Codes 001 c10f 010 xxxx */
1083 case 5: /* Misc Control Codes 001 c10f 010 xxxx */
1084 /* f ("field"): purpose? */
1085
1086 switch (c2 & 15) {
1087 case 0: /* Resume Caption Loading 001 c10f 010 0000 */
1088 ch = switch_channel(cc, ch, chan & 3);
1089
1090 ch->mode = MODE_POP_ON;
1091 return;
1092
1093 /* case 4: reserved */
1094
1095 case 5: /* Roll-Up Captions 001 c10f 010 0xxx */
1096 case 6:
1097 case 7:
1098 {
1099 int roll = (c2 & 7) - 3;
1100
1101 ch = switch_channel(cc, ch, chan & 3);
1102
1103 if (ch->mode == MODE_ROLL_UP && ch->roll == roll)
1104 return;
1105
1106 ch->mode = MODE_ROLL_UP;
1107 ch->roll = roll;
1108
1109 ch->row1 = ch->row - roll + 1;
1110 if (ch->row1 < 0)
1111 ch->row1 = 0;
1112 return;
1113 }
1114
1115 case 9: /* Resume Direct Captioning 001 c10f 010 1001 */
1116// not verified
1117 ch = switch_channel(cc, ch, chan & 3);
1118 ch->mode = MODE_PAINT_ON;
1119 return;
1120
1121 case 10: /* Text Restart 001 c10f 010 1010 */
1122// not verified
1123 erase_memory(cc, ch, ch->hidden);
1124 erase_memory(cc, ch, ch->hidden ^ 1);
1125 ch = switch_channel(cc, ch, chan | 4);
1126 set_cursor(ch, 1, 0);
1127 erase_memory(cc, ch, ch->hidden);
1128 erase_memory(cc, ch, ch->hidden ^ 1);
1129 return;
1130
1131 case 11: /* Resume Text Display 001 c10f 010 1011 */
1132 ch = switch_channel(cc, ch, chan | 4);
1133 return;
1134
1135 case 15: /* End Of Caption 001 c10f 010 1111 */
1136 ch = switch_channel(cc, ch, chan & 3);
1137 ch->mode = MODE_POP_ON;
1138
1139 word_break(cc, ch, 1);
1140
1141 ch->hidden ^= 1;
1142
1143 erase_memory(cc, ch, ch->hidden); // yes?
1144 update(ch);
1145
1146 /*
1147 * A Preamble Address Code should follow,
1148 * reset to a known state to be safe.
1149 * Reset ch->line for new ch->hidden.
1150 * XXX row 0?
1151 */
1152 set_cursor(ch, 1, ROWS - 1);
1153
1154 return;
1155
1156 case 8: /* Flash On 001 c10f 010 1000 */
1157// not verified
1158 ch->attr.flash = TRUE;
1159 return;
1160
1161 case 1: /* Backspace 001 c10f 010 0001 */
1162// not verified
1163 if (ch->mode) {
1164 if (ch->col > 1) {
1165 if (ch->line[ch->col - 1].unicode == 0)
1166 break;
1167 ch->col --;
1168 } else if (ch->row > 0) {
1169 vbi_char *acp;
1170 int p = (ch->mode == MODE_POP_ON) ? ch->hidden : (ch->hidden ^ 1);
1171
1172 ch->row --;
1173 ch->line = ch->pg[p].text + ch->row * COLUMNS;
1174 ch->col1 = 1;
1175 ch->col = COLUMNS - 1;
1176 acp = ch->line + COLUMNS - 1;
1177
1178 while (ch->col > 1) {
1179 if (acp->unicode != 0)
1180 break;
1181
1182 acp --;
1183 ch->col --;
1184 }
1185 } else {
1186 break;
1187 }
1188
1189
1190 memset(&ch->line[ch->col], 0, sizeof(vbi_char));
1191 if (ch->col < ch->col1)
1192 ch->col1 = ch->col;
1193
1194 update(ch);
1195 }
1196
1197 return;
1198
1199 case 13: /* Carriage Return 001 c10f 010 1101 */
1200 if (ch == cc->channel + 5)
1201 itv_separator(vbi, cc, 0);
1202
1203 if ((ch->row >= ROWS - 1) && (ch->mode == MODE_ROLL_UP)) {
1204 roll_up(ch, 1);
1205 set_cursor(ch, 1, ROWS - 1);
1206 update(ch);
1207 } else if (ch->row >= ROWS - 1) {
1208 set_cursor(ch, 1, ROWS - 1);
1209 if (ch->mode != MODE_POP_ON)
1210 update(ch);
1211 } else {
1212 set_cursor(ch, 1, ch->row + 1);
1213 if (ch->mode != MODE_POP_ON)
1214 update(ch);
1215 }
1216
1217 ch->attr.underline = FALSE;
1218 ch->attr.background = VBI_BLACK;
1219 ch->attr.opacity = VBI_OPAQUE;
1220 ch->attr.flash = FALSE;
1221 ch->attr.italic = FALSE;
1222 ch->attr.foreground = VBI_WHITE;
1223
1224 return;
1225
1226 case 4: /* Delete To End Of Row 001 c10f 010 0100 */
1227// not verified
1228 if (!ch->mode)
1229 return;
1230
1231 for (i = ch->col; i <= COLUMNS - 1; i++) {
1232 memset(&ch->line[i], 0, sizeof(vbi_char));
1233 }
1234
1235 word_break(cc, ch, 0);
1236
1237 if (ch->mode != MODE_POP_ON) {
1238 update(ch);
1239 }
1240
1241 return;
1242
1243 case 12: /* Erase Displayed Memory 001 c10f 010 1100 */
1244 if (cc->curr_chan < 4) {
1245 erase_memory(cc, ch, ch->hidden ^ 1);
1246 update(ch);
1247 }
1248 return;
1249 case 14: /* Erase Non-Displayed Memory 001 c10f 010 1110 */
1250 erase_memory(cc, ch, ch->hidden);
1251 return;
1252 }
1253
1254 return;
1255
1256 /* case 6: reserved */
1257
1258 case 7:
1259 if (!ch->mode)
1260 return;
1261
1262 switch (c2) {
1263 case 0x21 ... 0x23: /* Misc Control Codes, Tabs 001 c111 010 00xx */
1264// not verified
1265 /*
1266 col = ch->col;
1267
1268 for (i = c2 & 3; i > 0 && col < COLUMNS - 1; i--)
1269 ch->line[col++] = cc->transp_space[chan >> 2];
1270
1271 if (col > ch->col)
1272 ch->col = ch->col1 = col;*/
1273
1274 ch->col += (c2 & 3);
1275 if (ch->col >= COLUMNS)
1276 ch->col = COLUMNS - 1;
1277
1278 return;
1279
1280 case 0x2D: /* Optional Attributes 001 c111 010 11xx */
1281// not verified
1282 ch->attr.opacity = VBI_TRANSPARENT_FULL;
1283 break;
1284
1285 case 0x2E: /* Optional Attributes 001 c111 010 11xx */
1286 case 0x2F:
1287// not verified
1288 ch->attr.foreground = VBI_BLACK;
1289 ch->attr.underline = c2 & 1;
1290 break;
1291
1292 default:
1293 return;
1294 }
1295
1296 /* Optional Attributes, backspace magic */
1297
1298 if (ch->col > 1 && (ch->line[ch->col - 1].unicode & 0x7F) == 0x20) {
1299 vbi_char c = ch->attr;
1300
1301 c.unicode = 0x0020;
1302 ch->line[ch->col - 1] = c;
1303 }
1304 }
1305}
1306
1307static void
1308update_display (vbi_decoder *vbi)
1309{
1310 struct caption *cc = &vbi->cc;
1311 int i;
1312
1313 for (i=0; i<8; i++)
1314 {
1315 cc_channel *ch = &cc->channel[i];
1316
1317 if (ch->update_flag == 1) {
1318 render(ch);
1319 ch->update_flag = 0;
1320 }
1321 }
1322}
1323
1324/**
1325 * @internal
1326 * @param vbi Initialized vbi decoding context.
1327 * @param line ITU-R line number this data originated from.
1328 * @param buf Two bytes.
1329 *
1330 * Decode two bytes of Closed Caption data (Caption, XDS, ITV),
1331 * updating the decoder state accordingly. May send events.
1332 */
1333void
1334vbi_decode_caption(vbi_decoder *vbi, int line, uint8_t *buf)
1335{
1336 XDS_SEP_DEBUG("vbi_decode_caption\n");
1337 struct caption *cc = &vbi->cc;
1338 char c1 = buf[0] & 0x7F;
1339 int field2 = 1, i;
1340
1341 pthread_mutex_lock(&cc->mutex);
1342 //AM_DEBUG(1, "vbi_data: line: %d %x %x", line, buf[0], buf[1]);
1343
1344 if (line == 21) {
1345 cc->curr_chan = cc->curr_chan_f1;
1346 memcpy(cc->last, cc->last_f1, sizeof(cc->last));
1347 } else {
1348 cc->curr_chan = cc->curr_chan_f2;
1349 memcpy(cc->last, cc->last_f2, sizeof(cc->last));
1350 }
1351
1352 switch (line) {
1353 case 21: /* NTSC */
1354 case 22: /* PAL */
1355 field2 = 0;
1356 break;
1357
1358 case 335: /* PAL, hardly XDS */
1359 break;
1360
1361 case 284: /* NTSC */
1362 CC_DUMP(
1363 putchar(_vbi_to_ascii (buf[0]));
1364 putchar(_vbi_to_ascii (buf[1]));
1365 fflush(stdout);
1366 )
1367
1368 if (vbi_unpar8 (buf[0]) >= 0) { //vbi_unpar8 (buf[0]) >= 0
1369 if (c1 == 0) {
1370 goto finish;
1371 } else if (c1 <= 0x0F) {
1372 xds_separator(vbi, buf);
1373 cc->xds = (c1 != XDS_END);
1374 goto finish;
1375 } else if (c1 <= 0x1F) {
1376 xds_sub_packet *sp = cc->curr_sp;
1377 unsigned int class, type;
1378 if (sp) {
1379 class = (sp - cc->sub_packet[0]) / elements(cc->sub_packet[0]);
1380 type = (sp - cc->sub_packet[0]) % elements(cc->sub_packet[0]);
1381 xds_decoder(vbi, class, type, sp->buffer, sp->count - 2);
1382 }
1383 cc->xds = FALSE;
1384 } else if (cc->xds) {
1385 xds_separator(vbi, buf);
1386 goto finish;
1387 }
1388 } else if (cc->xds) {
1389 xds_separator(vbi, buf);
1390 goto finish;
1391 }
1392
1393 break;
1394
1395 default:
1396 goto finish;
1397 }
1398
1399 //if ( (buf[0]) < 0) { //vbi_unpar8 (buf[0]) < 0
1400 if ( vbi_unpar8 (buf[0]) < 0) { //
1401#if 0
1402 c1 = 127;
1403 buf[0] = c1; /* traditional 'bad' glyph, ccfont has */
1404 buf[1] = c1; /* room, design a special glyph? */
1405#else
1406 goto finish;
1407#endif
1408 }
1409
1410 CC_DUMP(
1411 putchar(_vbi_to_ascii (buf[0]));
1412 putchar(_vbi_to_ascii (buf[1]));
1413 fflush(stdout);
1414 )
1415
1416 switch (c1) {
1417 cc_channel *ch;
1418 vbi_char c;
1419
1420 case 0x01 ... 0x0F:
1421 /*if (!field2)*/
1422 cc->last[0] = 0;
1423 break; /* XDS field 1?? */
1424
1425 case 0x10 ... 0x1F:
1426 //if ( (buf[1]) >= 0) { // vbi_unpar8 (buf[1])
1427 if ( vbi_unpar8 (buf[1]) >= 0) {
1428 if (/*!field2
1429 &&*/ buf[0] == cc->last[0]
1430 && buf[1] == cc->last[1]) {
1431 /* cmd repetition F1: already executed */
1432 cc->last[0] = 0; /* one rep */
1433 break;
1434 }
1435
1436 caption_command(vbi, cc, c1, buf[1] & 0x7F, field2);
1437
1438 /*if (!field2)*/ {
1439 cc->last[0] = buf[0];
1440 cc->last[1] = buf[1];
1441 }
1442 } else /*if (!field2)*/
1443 cc->last[0] = 0;
1444
1445 break;
1446
1447 default:
1448 CC_TEXT_DUMP(
1449 putchar(_vbi_to_ascii (buf[0]));
1450 putchar(_vbi_to_ascii (buf[1]));
1451 fflush(stdout);
1452 )
1453#if 0
1454 AM_DEBUG(1, "text value: %c %c %x %x", _vbi_to_ascii(buf[0]),
1455 _vbi_to_ascii(buf[1]), buf[0], buf[1]);
1456#endif
1457
1458 ch = &cc->channel[(cc->curr_chan & 5) + field2 * 2];
1459
1460 if (buf[0] == 0x80 && buf[1] == 0x80) {
1461 if (ch->mode) {
1462 if (ch->nul_ct == 2)
1463 word_break(cc, ch, 1);
1464 ch->nul_ct += 2;
1465 }
1466
1467 break;
1468 }
1469
1470 /*if (!field2)*/
1471 cc->last[0] = 0;
1472
1473 ch->nul_ct = 0;
1474
1475 if (!ch->mode)
1476 break;
1477
1478 ch->time = vbi->time; /* activity measure */
1479
1480 c = ch->attr;
1481
1482 for (i = 0; i < 2; i++) {
1483 //char ci = (buf[i]) & 0x7F; /* 127 if bad */ //vbi_unpar8 (buf[i])
1484 char ci = vbi_unpar8 (buf[i]) & 0x7F; /* 127 if bad */
1485 if (ci <= 0x1F) /* 0x00 no char, 0x01 ... 0x1F invalid */
1486 continue;
1487
1488 if (ch == cc->channel + 5) // 'T2'
1489 itv_separator(vbi, cc, ci);
1490
1491 c.unicode = vbi_caption_unicode(ci, /* to_upper */ FALSE);
1492
1493 put_char(cc, ch, c);
1494 }
1495 }
1496
1497 update_display(vbi);
1498
1499 if (line == 21) {
1500 cc->curr_chan_f1 = cc->curr_chan;
1501 memcpy(cc->last_f1, cc->last, sizeof(cc->last));
1502 } else {
1503 cc->curr_chan_f2 = cc->curr_chan;
1504 memcpy(cc->last_f2, cc->last, sizeof(cc->last));
1505 }
1506
1507 finish:
1508 pthread_mutex_unlock(&cc->mutex);
1509}
1510
1511/**
1512 * @internal
1513 * @param vbi Initialized vbi decoding context.
1514 *
1515 * This function must be called after desynchronisation
1516 * has been detected (i. e. vbi data has been lost)
1517 * to reset the Closed Caption decoder.
1518 */
1519void
1520vbi_caption_desync(vbi_decoder *vbi)
1521{
1522 struct caption *cc = &vbi->cc;
1523
1524 /* cc->curr_chan = 8; *//* garbage */
1525
1526 /* cc->xds = FALSE; */
1527
1528 if (cc->curr_sp) {
1529 memset(cc->curr_sp, 0, sizeof(*(cc->curr_sp)));
1530 cc->curr_sp = NULL;
1531 }
1532
1533 cc->itv_count = 0;
1534}
1535
1536/**
1537 * @internal
1538 * @param vbi Initialized vbi decoding context.
1539 *
1540 * This function must be called after a channel switch,
1541 * to reset the Closed Caption decoder.
1542 */
1543void
1544vbi_caption_channel_switched(vbi_decoder *vbi)
1545{
1546 struct caption *cc = &vbi->cc;
1547 cc_channel *ch;
1548 int i;
1549
1550 for (i = 0; i < 9; i++) {
1551 ch = &cc->channel[i];
1552
1553 if (i < 4) {
1554 ch->mode = MODE_NONE; // MODE_ROLL_UP;
1555 ch->row = ROWS - 1;
1556 ch->row1 = ROWS - 4;
1557 ch->roll = 4;
1558 } else {
1559 ch->mode = MODE_TEXT;
1560 ch->row1 = ch->row = 0;
1561 ch->roll = ROWS;
1562 }
1563
1564 ch->attr.opacity = VBI_OPAQUE;
1565 ch->attr.foreground = VBI_WHITE;
1566 ch->attr.background = VBI_BLACK;
1567
1568 set_cursor(ch, 1, ch->row);
1569
1570 ch->time = 0.0;
1571
1572 ch->hidden = 0;
1573
1574 ch->pg[0].dirty.y0 = 0;
1575 ch->pg[0].dirty.y1 = ROWS - 1;
1576 ch->pg[0].dirty.roll = 0;
1577
1578 erase_memory(cc, ch, 0);
1579
1580 memcpy(&ch->pg[1], &ch->pg[0], sizeof(ch->pg[1]));
1581 }
1582
1583 cc->xds = FALSE;
1584
1585 memset(&cc->sub_packet, 0, sizeof(cc->sub_packet));
1586
1587 cc->info_cycle[0] = 0;
1588 cc->info_cycle[1] = 0;
1589
1590 vbi_caption_desync(vbi);
1591}
1592
1593static vbi_rgba
1594default_color_map[8] = {
1595 VBI_RGBA(0x00, 0x00, 0x00), VBI_RGBA(0xFF, 0x00, 0x00),
1596 VBI_RGBA(0x00, 0xFF, 0x00), VBI_RGBA(0xFF, 0xFF, 0x00),
1597 VBI_RGBA(0x00, 0x00, 0xFF), VBI_RGBA(0xFF, 0x00, 0xFF),
1598 VBI_RGBA(0x00, 0xFF, 0xFF), VBI_RGBA(0xFF, 0xFF, 0xFF)
1599};
1600
1601/**
1602 * @internal
1603 * @param vbi Initialized vbi decoding context.
1604 *
1605 * After the client changed text brightness and saturation
1606 * this function adjusts the Closed Caption color palette.
1607 */
1608void
1609vbi_caption_color_level(vbi_decoder *vbi)
1610{
1611 int i;
1612
1613 vbi_transp_colormap(vbi, vbi->cc.channel[0].pg[0].color_map,
1614 default_color_map, 8);
1615
1616 for (i = 1; i < 16; i++)
1617 memcpy(vbi->cc.channel[i >> 1].pg[i & 1].color_map,
1618 vbi->cc.channel[0].pg[0].color_map,
1619 sizeof(default_color_map));
1620}
1621
1622/**
1623 * @internal
1624 * @param vbi VBI decoding context.
1625 *
1626 * This function is called during @a vbi destruction
1627 * to destroy Closed Caption subset of @a vbi.
1628 */
1629void
1630vbi_caption_destroy(vbi_decoder *vbi)
1631{
1632 pthread_mutex_destroy(&vbi->cc.mutex);
1633}
1634
1635/**
1636 * @internal
1637 * @param vbi VBI decoding context.
1638 *
1639 * This function is called during @a vbi initialization
1640 * to initialize the Closed Caption subset of @a vbi.
1641 */
1642void
1643vbi_caption_init(vbi_decoder *vbi)
1644{
1645 struct caption *cc = &vbi->cc;
1646 cc_channel *ch;
1647 int i;
1648
1649 memset(cc, 0, sizeof(struct caption));
1650
1651 pthread_mutex_init(&cc->mutex, NULL);
1652
1653 for (i = 0; i < 9; i++) {
1654 ch = &cc->channel[i];
1655
1656 ch->pg[0].vbi = vbi;
1657
1658 ch->pg[0].pgno = i + 1;
1659 ch->pg[0].subno = 0;
1660
1661 ch->pg[0].rows = ROWS;
1662 ch->pg[0].columns = COLUMNS;
1663
1664 ch->pg[0].screen_color = 0;
1665 ch->pg[0].screen_opacity = (i < 4) ? VBI_TRANSPARENT_SPACE : VBI_OPAQUE;
1666
1667 ch->pg[0].font[0] = vbi_font_descriptors; /* English */
1668 ch->pg[0].font[1] = vbi_font_descriptors;
1669
1670 memcpy(&ch->pg[1], &ch->pg[0], sizeof(ch->pg[1]));
1671 memcpy(&ch->pg[2], &ch->pg[0], sizeof(ch->pg[2]));
1672
1673 if (i >= 4)
1674 ch->pos_flag = 1;
1675 }
1676
1677 for (i = 0; i < 2; i++) {
1678 cc->transp_space[i].foreground = VBI_WHITE;
1679 cc->transp_space[i].background = VBI_BLACK;
1680 cc->transp_space[i].unicode = 0x0020;
1681 }
1682
1683 cc->transp_space[0].opacity = VBI_TRANSPARENT_SPACE;
1684 cc->transp_space[1].opacity = VBI_OPAQUE;
1685
1686 vbi_caption_channel_switched(vbi);
1687
1688 vbi_caption_color_level(vbi);
1689}
1690
1691/**
1692 * @param vbi Initialized vbi decoding context.
1693 * @param pg Place to store the formatted page.
1694 * @param pgno Page number 1 ... 8 of the page to fetch, see vbi_pgno.
1695 * @param reset @c TRUE resets the vbi_page dirty fields in cache after
1696 * fetching. Pass @c FALSE only if you plan to call this function again
1697 * to update other displays.
1698 *
1699 * Fetches a Closed Caption page designated by @a pgno from the cache,
1700 * formats and stores it in @a pg. CC pages are transmitted basically in
1701 * two modes: at once and character by character ("roll-up" mode).
1702 * Either way you get a snapshot of the page as it should appear on
1703 * screen at present. With vbi_event_handler_add() you can request a
1704 * @c VBI_EVENT_CAPTION event to be notified about pending changes
1705 * (in case of "roll-up" mode that is with each new word received)
1706 * and the vbi_page->dirty fields will mark the lines actually in
1707 * need of updates, to speed up rendering.
1708 *
1709 * Although safe to do, this function is not supposed to be
1710 * called from an event handler, since rendering may block decoding
1711 * for extended periods of time.
1712 *
1713 * @return
1714 * @c FALSE if some error occured.
1715 */
1716vbi_bool
1717vbi_fetch_cc_page(vbi_decoder *vbi, vbi_page *pg, vbi_pgno pgno, vbi_bool reset)
1718{
1719 cc_channel *ch = vbi->cc.channel + ((pgno - 1) & 7);
1720 vbi_page *spg;
1721
1722 reset = reset;
1723
1724 if (pgno < 1 || pgno > 8)
1725 return FALSE;
1726
1727 pthread_mutex_lock(&vbi->cc.mutex);
1728
1729 spg = ch->pg + 2;
1730
1731 memcpy(pg, spg, sizeof(*pg)); /* shortcut? */
1732
1733 spg->dirty.y0 = ROWS;
1734 spg->dirty.y1 = -1;
1735 spg->dirty.roll = 0;
1736
1737 pthread_mutex_unlock(&vbi->cc.mutex);
1738
1739 return 1;
1740}
1741
1742void vbi_refresh_cc(vbi_decoder *vbi)
1743{
1744 cc_channel *ch;
1745 vbi_page *spg;
1746 int i, j;
1747 vbi_event event;
1748 struct timespec now;
1749 int flash;
1750
1751 clock_gettime(CLOCK_REALTIME, &now);
1752
1753 flash = (now.tv_nsec / 250000000) & 1;
1754
1755 pthread_mutex_lock(&vbi->cc.mutex);
1756
1757 if (flash != vbi->cc.flash_state) {
1758 vbi->cc.flash_state = flash;
1759
1760 for (i = 0; i < 8; i++)
1761 {
1762 ch = &vbi->cc.channel[i];
1763 spg = ch->pg + 2;
1764 for (j = 0; j < ROWS * COLUMNS; j++)
1765 {
1766 if (spg->text[j].flash)
1767 {
1768 update(ch);
1769 break;
1770 }
1771 }
1772 }
1773
1774 update_display(vbi);
1775 }
1776
1777 pthread_mutex_unlock(&vbi->cc.mutex);
1778}
1779
1780/*
1781Local variables:
1782c-set-style: K&R
1783c-basic-offset: 8
1784End:
1785*/
1786
generated by cgit at 2024-05-17 03:11:15 (GMT)