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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, int new_chan)
900{
901 switch (new_chan) {
902 case 0:
903 case 4:
904 cc->curr_chan_f1_d1 = new_chan;
905 break;
906 case 1:
907 case 5:
908 cc->curr_chan_f1_d2 = new_chan;
909 break;
910 case 2:
911 case 6:
912 cc->curr_chan_f2_d1 = new_chan;
913 break;
914 case 3:
915 case 7:
916 cc->curr_chan_f2_d2 = new_chan;
917 break;
918 }
919
920 switch (new_chan) {
921 case 0:
922 case 1:
923 case 4:
924 case 5:
925 cc->curr_chan_f1 = new_chan;
926 break;
927 case 2:
928 case 3:
929 case 6:
930 case 7:
931 cc->curr_chan_f2 = new_chan;
932 break;
933 }
934
935 return &cc->channel[cc->curr_chan = new_chan];
936}
937
938static void
939erase_memory(struct caption *cc, cc_channel *ch, int page)
940{
941 vbi_page *pg = ch->pg + page;
942
943 memset(pg->text, 0, ROWS * COLUMNS * sizeof(vbi_char));
944}
945
946static const vbi_color
947palette_mapping[8] = {
948 VBI_WHITE, VBI_GREEN, VBI_BLUE, VBI_CYAN,
949 VBI_RED, VBI_YELLOW, VBI_MAGENTA, VBI_BLACK
950};
951
952static int
953row_mapping[] = {
954 10, -1, 0, 1, 2, 3, 11, 12, 13, 14, 4, 5, 6, 7, 8, 9
955};
956
957// not verified means I didn't encounter the code in a
958// sample stream yet
959
960_vbi_inline void
961caption_command(vbi_decoder *vbi, struct caption *cc,
962 unsigned char c1, unsigned char c2, vbi_bool field2)
963{
964 XDS_SEP_DEBUG("caption_command\n");
965 cc_channel *ch;
966 vbi_char *c;
967 int chan, col, i;
968 int last_row;
969 //chan = (cc->curr_chan & 4) + field2 * 2 + ((c1 >> 3) & 1);
970
971 if (field2) {
972 chan = (c1 & 8) ? cc->curr_chan_f2_d2 : cc->curr_chan_f2_d1;
973 } else {
974 chan = (c1 & 8) ? cc->curr_chan_f1_d2 : cc->curr_chan_f1_d1;
975 }
976
977 switch_channel(cc, chan);
978
979 ch = &cc->channel[chan];
980
981 c1 &= 7;
982
983 if (c2 >= 0x40) { /* Preamble Address Codes 001 crrr 1ri xxxu */
984 int row = row_mapping[(c1 << 1) + ((c2 >> 5) & 1)];
985 int old_row = ch->row;
986
987 if (row < 0 || !ch->mode)
988 return;
989
990 ch->attr.underline = c2 & 1;
991 ch->attr.background = VBI_BLACK;
992 ch->attr.opacity = VBI_OPAQUE;
993 ch->attr.flash = FALSE;
994
995 word_break(cc, ch, 1);
996
997 if (ch->mode == MODE_ROLL_UP) {
998 int row1 = row - ch->roll + 1;
999 int roll;
1000
1001 if (row1 < 0)
1002 row1 = 0;
1003
1004 roll = ch->row1 - row1;
1005 if (roll > 0) {
1006 roll_up(ch, ch->row1 - row1);
1007 update(ch);
1008 }
1009 }
1010
1011 set_cursor(ch, 1, row);
1012
1013 if (c2 & 0x10) {
1014 /*
1015 col = ch->col;
1016
1017 for (i = (c2 & 14) * 2; i > 0 && col < COLUMNS - 1; i--)
1018 ch->line[col++] = cc->transp_space[chan >> 2];
1019
1020 if (col > ch->col)
1021 ch->col = ch->col1 = col;
1022 */
1023
1024 ch->col = (c2 & 14) * 2 + 1;
1025
1026 if (old_row != ch->row) {
1027 ch->attr.italic = FALSE;
1028 ch->attr.foreground = VBI_WHITE;
1029 }
1030 } else {
1031// not verified
1032 c2 = (c2 >> 1) & 7;
1033
1034 if (c2 < 7) {
1035 ch->attr.italic = FALSE;
1036 ch->attr.foreground = palette_mapping[c2];
1037 } else {
1038 ch->attr.italic = TRUE;
1039 ch->attr.foreground = VBI_WHITE;
1040 }
1041 }
1042
1043 return;
1044 }
1045
1046 switch (c1) {
1047 case 0:
1048 /* Optional Attributes 001 c000 010 xxxt */
1049 ch->attr.opacity = (c2 & 1) ? VBI_SEMI_TRANSPARENT : VBI_OPAQUE;
1050 ch->attr.background = palette_mapping[(c2 >> 1) & 7];
1051
1052 for (i = 0; i < 2; i ++) {
1053 int col = ch->col - i;
1054
1055 if ((col > 0) && (col < COLUMNS - 1)) {
1056 vbi_char c = ch->line[col];
1057
1058 if (c.unicode == 0x20) {
1059 c.background = ch->attr.background;
1060 c.opacity = ch->attr.opacity;
1061 set_char(ch, col, c);
1062 }
1063 }
1064 }
1065 return;
1066
1067 case 1:
1068 if (c2 & 0x10) { /* Special Characters 001 c001 011 xxxx */
1069// not verified
1070 c2 &= 15;
1071
1072 if (c2 == 9) { // "transparent space"
1073 if (ch->col < COLUMNS - 1) {
1074 set_char(ch, ch->col++, cc->transp_space[chan >> 2]);
1075 ch->col1 = ch->col;
1076 } else {
1077 set_char(ch, COLUMNS - 2, cc->transp_space[chan >> 2]);
1078 }
1079
1080 } else {
1081 vbi_char c = ch->attr;
1082
1083 c.unicode = vbi_caption_unicode (0x1130 | (c2 & 15),
1084 /* to_upper */ FALSE);
1085 XDS_SEP_DEBUG("vbi_caption_unicode %c\n",c.unicode);
1086 put_char(cc, ch, c);
1087 }
1088 } else { /* Midrow Codes 001 c001 010 xxxu */
1089// not verified
1090 vbi_char c = ch->attr;
1091
1092 c.flash = FALSE;
1093 c.underline = FALSE;
1094 c.unicode = ' ';
1095
1096 put_char(cc, ch, c);
1097
1098 ch->attr.flash = FALSE;
1099 ch->attr.underline = c2 & 1;
1100
1101 c2 = (c2 >> 1) & 7;
1102
1103 if (c2 < 7) {
1104 ch->attr.italic = FALSE;
1105 ch->attr.foreground = palette_mapping[c2];
1106 } else {
1107 ch->attr.italic = TRUE;
1108 }
1109 }
1110
1111 return;
1112
1113 case 2: /* Optional Extended Characters 001 c01f 01x xxxx */
1114 case 3:
1115 /* Send specs to the maintainer of this code */
1116 {
1117 vbi_char c;
1118
1119 c = ch->attr;
1120 c.unicode = vbi_caption_unicode((c1 << 8) | c2 | 0x1000, 0);
1121
1122 if (c.unicode) {
1123 if (ch->col > 1)
1124 ch->col --;
1125
1126 put_char(cc, ch, c);
1127 }
1128 }
1129 return;
1130
1131 case 4: /* Misc Control Codes 001 c10f 010 xxxx */
1132 case 5: /* Misc Control Codes 001 c10f 010 xxxx */
1133 /* f ("field"): purpose? */
1134
1135 switch (c2 & 15) {
1136 case 0: /* Resume Caption Loading 001 c10f 010 0000 */
1137 ch = switch_channel(cc, chan & 3);
1138 ch->pos_flag = 1;
1139 ch->mode = MODE_POP_ON;
1140 return;
1141
1142 /* case 4: reserved */
1143
1144 case 5: /* Roll-Up Captions 001 c10f 010 0xxx */
1145 case 6:
1146 case 7:
1147 {
1148 int roll = (c2 & 7) - 3;
1149
1150 ch = switch_channel(cc, chan & 3);
1151 ch->pos_flag = 1;
1152
1153 if (ch->mode == MODE_ROLL_UP && ch->roll == roll)
1154 return;
1155
1156 ch->mode = MODE_ROLL_UP;
1157 ch->roll = roll;
1158
1159 ch->row1 = ch->row - roll + 1;
1160 if (ch->row1 < 0)
1161 ch->row1 = 0;
1162 return;
1163 }
1164
1165 case 9: /* Resume Direct Captioning 001 c10f 010 1001 */
1166// not verified
1167 ch = switch_channel(cc, chan & 3);
1168 ch->mode = MODE_PAINT_ON;
1169 ch->pos_flag = 1;
1170 return;
1171
1172 case 10: /* Text Restart 001 c10f 010 1010 */
1173// not verified
1174 erase_memory(cc, ch, ch->hidden);
1175 erase_memory(cc, ch, ch->hidden ^ 1);
1176 ch = switch_channel(cc, chan | 4);
1177 ch->pos_flag = 1;
1178 set_cursor(ch, 1, 0);
1179 erase_memory(cc, ch, ch->hidden);
1180 erase_memory(cc, ch, ch->hidden ^ 1);
1181 return;
1182
1183 case 11: /* Resume Text Display 001 c10f 010 1011 */
1184 ch = switch_channel(cc, chan | 4);
1185 ch->pos_flag = 1;
1186 return;
1187
1188 case 15: /* End Of Caption 001 c10f 010 1111 */
1189 ch = switch_channel(cc, chan & 3);
1190 ch->pos_flag = 1;
1191
1192 ch->mode = MODE_POP_ON;
1193
1194 word_break(cc, ch, 1);
1195
1196 ch->hidden ^= 1;
1197
1198 //erase_memory(cc, ch, ch->hidden); // yes?
1199 update(ch);
1200
1201 /*
1202 * A Preamble Address Code should follow,
1203 * reset to a known state to be safe.
1204 * Reset ch->line for new ch->hidden.
1205 * XXX row 0?
1206 */
1207 set_cursor(ch, 1, ROWS - 1);
1208
1209 return;
1210
1211 case 8: /* Flash On 001 c10f 010 1000 */
1212// not verified
1213 ch->attr.flash = TRUE;
1214 return;
1215
1216 case 1: /* Backspace 001 c10f 010 0001 */
1217// not verified
1218 if (ch->mode) {
1219 if (ch->col > 1) {
1220 if (ch->line[ch->col - 1].unicode == 0)
1221 break;
1222 ch->col --;
1223 } else if (ch->row > 0) {
1224 vbi_char *acp;
1225 int p = (ch->mode == MODE_POP_ON) ? ch->hidden : (ch->hidden ^ 1);
1226
1227 ch->row --;
1228 ch->line = ch->pg[p].text + ch->row * COLUMNS;
1229 ch->col1 = 1;
1230 ch->col = COLUMNS - 1;
1231 acp = ch->line + COLUMNS - 1;
1232
1233 while (ch->col > 1) {
1234 if (acp->unicode != 0)
1235 break;
1236
1237 acp --;
1238 ch->col --;
1239 }
1240 } else {
1241 break;
1242 }
1243
1244
1245 memset(&ch->line[ch->col], 0, sizeof(vbi_char));
1246 if (ch->col < ch->col1)
1247 ch->col1 = ch->col;
1248
1249 update(ch);
1250 }
1251
1252 return;
1253
1254 case 13: /* Carriage Return 001 c10f 010 1101 */
1255 if (ch == cc->channel + 5)
1256 itv_separator(vbi, cc, 0);
1257
1258 if ((ch->row >= ROWS - 1) && ((ch->mode == MODE_ROLL_UP) || (ch->mode == MODE_TEXT))) {
1259 roll_up(ch, 1);
1260 set_cursor(ch, 1, ROWS - 1);
1261 update(ch);
1262 } else if (ch->row >= ROWS - 1) {
1263 set_cursor(ch, 1, ROWS - 1);
1264 if (ch->mode != MODE_POP_ON)
1265 update(ch);
1266 } else {
1267 set_cursor(ch, 1, ch->row + 1);
1268 if (ch->mode != MODE_POP_ON)
1269 update(ch);
1270 }
1271
1272 ch->attr.underline = FALSE;
1273 ch->attr.background = VBI_BLACK;
1274 ch->attr.opacity = VBI_OPAQUE;
1275 ch->attr.flash = FALSE;
1276 ch->attr.italic = FALSE;
1277 ch->attr.foreground = VBI_WHITE;
1278
1279 return;
1280
1281 case 4: /* Delete To End Of Row 001 c10f 010 0100 */
1282// not verified
1283 if (!ch->mode)
1284 return;
1285
1286 for (i = ch->col; i <= COLUMNS - 1; i++) {
1287 memset(&ch->line[i], 0, sizeof(vbi_char));
1288 }
1289
1290 word_break(cc, ch, 0);
1291
1292 if (ch->mode != MODE_POP_ON) {
1293 update(ch);
1294 }
1295
1296 return;
1297
1298 case 12: /* Erase Displayed Memory 001 c10f 010 1100 */
1299 if (chan < 4) {
1300 erase_memory(cc, ch, ch->hidden ^ 1);
1301 update(ch);
1302 }
1303 return;
1304 case 14: /* Erase Non-Displayed Memory 001 c10f 010 1110 */
1305 erase_memory(cc, ch, ch->hidden);
1306 return;
1307 }
1308
1309 return;
1310
1311 /* case 6: reserved */
1312
1313 case 7:
1314 if (!ch->mode)
1315 return;
1316
1317 switch (c2) {
1318 case 0x21 ... 0x23: /* Misc Control Codes, Tabs 001 c111 010 00xx */
1319// not verified
1320 /*
1321 col = ch->col;
1322
1323 for (i = c2 & 3; i > 0 && col < COLUMNS - 1; i--)
1324 ch->line[col++] = cc->transp_space[chan >> 2];
1325
1326 if (col > ch->col)
1327 ch->col = ch->col1 = col;*/
1328
1329 ch->col += (c2 & 3);
1330 if (ch->col >= COLUMNS)
1331 ch->col = COLUMNS - 1;
1332
1333 return;
1334
1335 case 0x2D: /* Optional Attributes 001 c111 010 11xx */
1336// not verified
1337 ch->attr.opacity = VBI_TRANSPARENT_FULL;
1338 break;
1339
1340 case 0x2E: /* Optional Attributes 001 c111 010 11xx */
1341 case 0x2F:
1342// not verified
1343 ch->attr.foreground = VBI_BLACK;
1344 ch->attr.underline = c2 & 1;
1345 break;
1346
1347 default:
1348 return;
1349 }
1350
1351 /* Optional Attributes, backspace magic */
1352
1353 if (ch->col > 1 && (ch->line[ch->col - 1].unicode & 0x7F) == 0x20) {
1354 vbi_char c = ch->attr;
1355
1356 c.unicode = 0x0020;
1357 ch->line[ch->col - 1] = c;
1358 }
1359 }
1360}
1361
1362static void
1363update_display (vbi_decoder *vbi)
1364{
1365 struct caption *cc = &vbi->cc;
1366 int i;
1367
1368 for (i=0; i<8; i++)
1369 {
1370 cc_channel *ch = &cc->channel[i];
1371
1372 if (ch->update_flag == 1) {
1373 render(ch);
1374 ch->update_flag = 0;
1375 }
1376 }
1377}
1378
1379/**
1380 * @internal
1381 * @param vbi Initialized vbi decoding context.
1382 * @param line ITU-R line number this data originated from.
1383 * @param buf Two bytes.
1384 *
1385 * Decode two bytes of Closed Caption data (Caption, XDS, ITV),
1386 * updating the decoder state accordingly. May send events.
1387 */
1388void
1389vbi_decode_caption(vbi_decoder *vbi, int line, uint8_t *buf)
1390{
1391 XDS_SEP_DEBUG("vbi_decode_caption\n");
1392 struct caption *cc = &vbi->cc;
1393 char c1 = buf[0] & 0x7F;
1394 int field2 = 1, i;
1395 int flash;
1396 struct timespec now;
1397
1398 pthread_mutex_lock(&cc->mutex);
1399 //AM_DEBUG(1, "vbi_data: line: %d %x %x", line, buf[0], buf[1]);
1400
1401 if (line == 21) {
1402 cc->curr_chan = cc->curr_chan_f1;
1403 memcpy(cc->last, cc->last_f1, sizeof(cc->last));
1404 } else {
1405 cc->curr_chan = cc->curr_chan_f2;
1406 memcpy(cc->last, cc->last_f2, sizeof(cc->last));
1407 }
1408
1409 switch (line) {
1410 case 21: /* NTSC */
1411 case 22: /* PAL */
1412 field2 = 0;
1413 break;
1414
1415 case 335: /* PAL, hardly XDS */
1416 break;
1417
1418 case 284: /* NTSC */
1419 CC_DUMP(
1420 putchar(_vbi_to_ascii (buf[0]));
1421 putchar(_vbi_to_ascii (buf[1]));
1422 fflush(stdout);
1423 )
1424
1425 if (vbi_unpar8 (buf[0]) >= 0) { //vbi_unpar8 (buf[0]) >= 0
1426 if (c1 == 0) {
1427 goto finish;
1428 } else if (c1 <= 0x0F) {
1429 xds_separator(vbi, buf);
1430 cc->xds = (c1 != XDS_END);
1431 goto finish;
1432 } else if (c1 <= 0x1F) {
1433 xds_sub_packet *sp = cc->curr_sp;
1434 unsigned int class, type;
1435 if (sp) {
1436 class = (sp - cc->sub_packet[0]) / elements(cc->sub_packet[0]);
1437 type = (sp - cc->sub_packet[0]) % elements(cc->sub_packet[0]);
1438 xds_decoder(vbi, class, type, sp->buffer, sp->count - 2);
1439 }
1440 cc->xds = FALSE;
1441 } else if (cc->xds) {
1442 xds_separator(vbi, buf);
1443 goto finish;
1444 }
1445 } else if (cc->xds) {
1446 xds_separator(vbi, buf);
1447 goto finish;
1448 }
1449
1450 break;
1451
1452 default:
1453 goto finish;
1454 }
1455
1456 //if ( (buf[0]) < 0) { //vbi_unpar8 (buf[0]) < 0
1457 if ( vbi_unpar8 (buf[0]) < 0) { //
1458#if 0
1459 c1 = 127;
1460 buf[0] = c1; /* traditional 'bad' glyph, ccfont has */
1461 buf[1] = c1; /* room, design a special glyph? */
1462#else
1463 goto finish;
1464#endif
1465 }
1466
1467 CC_DUMP(
1468 putchar(_vbi_to_ascii (buf[0]));
1469 putchar(_vbi_to_ascii (buf[1]));
1470 fflush(stdout);
1471 )
1472
1473 switch (c1) {
1474 cc_channel *ch;
1475 vbi_char c;
1476
1477 case 0x01 ... 0x0F:
1478 /*if (!field2)*/
1479 cc->last[0] = 0;
1480 break; /* XDS field 1?? */
1481
1482 case 0x10 ... 0x1F:
1483 //if ( (buf[1]) >= 0) { // vbi_unpar8 (buf[1])
1484 if ( vbi_unpar8 (buf[1]) >= 0) {
1485 if (/*!field2
1486 &&*/ buf[0] == cc->last[0]
1487 && buf[1] == cc->last[1]) {
1488 /* cmd repetition F1: already executed */
1489 cc->last[0] = 0; /* one rep */
1490 break;
1491 }
1492
1493 caption_command(vbi, cc, c1, buf[1] & 0x7F, field2);
1494
1495 /*if (!field2)*/ {
1496 cc->last[0] = buf[0];
1497 cc->last[1] = buf[1];
1498 }
1499 } else /*if (!field2)*/
1500 cc->last[0] = 0;
1501
1502 break;
1503
1504 default:
1505 CC_TEXT_DUMP(
1506 putchar(_vbi_to_ascii (buf[0]));
1507 putchar(_vbi_to_ascii (buf[1]));
1508 fflush(stdout);
1509 )
1510#if 0
1511 AM_DEBUG(1, "text value: %c %c %x %x", _vbi_to_ascii(buf[0]),
1512 _vbi_to_ascii(buf[1]), buf[0], buf[1]);
1513#endif
1514
1515 ch = &cc->channel[(cc->curr_chan & 5) + field2 * 2];
1516
1517 if (buf[0] == 0x80 && buf[1] == 0x80) {
1518 if (ch->mode) {
1519 if (ch->nul_ct == 2)
1520 word_break(cc, ch, 1);
1521 ch->nul_ct += 2;
1522 }
1523
1524 break;
1525 }
1526
1527 /*if (!field2)*/
1528 cc->last[0] = 0;
1529
1530 ch->nul_ct = 0;
1531
1532 if (!ch->mode)
1533 break;
1534
1535 ch->time = vbi->time; /* activity measure */
1536
1537 c = ch->attr;
1538
1539 for (i = 0; i < 2; i++) {
1540 //char ci = (buf[i]) & 0x7F; /* 127 if bad */ //vbi_unpar8 (buf[i])
1541 char ci = vbi_unpar8 (buf[i]) & 0x7F; /* 127 if bad */
1542 if (ci <= 0x1F) /* 0x00 no char, 0x01 ... 0x1F invalid */
1543 continue;
1544
1545 if (ch == cc->channel + 5) // 'T2'
1546 itv_separator(vbi, cc, ci);
1547
1548 c.unicode = vbi_caption_unicode(ci, /* to_upper */ FALSE);
1549
1550 put_char(cc, ch, c);
1551 }
1552 }
1553
1554 clock_gettime(CLOCK_REALTIME, &now);
1555
1556 flash = (now.tv_nsec / 250000000) & 1;
1557
1558 if (flash != vbi->cc.flash_state) {
1559 int i, j;
1560
1561 vbi->cc.flash_state = flash;
1562
1563 for (i = 0; i < 8; i++)
1564 {
1565 cc_channel *ch;
1566 vbi_page *spg;
1567
1568 ch = &vbi->cc.channel[i];
1569 spg = ch->pg + 2;
1570 for (j = 0; j < ROWS * COLUMNS; j++)
1571 {
1572 if (spg->text[j].flash)
1573 {
1574 update(ch);
1575 break;
1576 }
1577 }
1578 }
1579 }
1580
1581 update_display(vbi);
1582
1583 if (line == 21) {
1584 //cc->curr_chan_f1 = cc->curr_chan;
1585 memcpy(cc->last_f1, cc->last, sizeof(cc->last));
1586 } else {
1587 //cc->curr_chan_f2 = cc->curr_chan;
1588 memcpy(cc->last_f2, cc->last, sizeof(cc->last));
1589 }
1590
1591 finish:
1592 pthread_mutex_unlock(&cc->mutex);
1593}
1594
1595/**
1596 * @internal
1597 * @param vbi Initialized vbi decoding context.
1598 *
1599 * This function must be called after desynchronisation
1600 * has been detected (i. e. vbi data has been lost)
1601 * to reset the Closed Caption decoder.
1602 */
1603void
1604vbi_caption_desync(vbi_decoder *vbi)
1605{
1606 struct caption *cc = &vbi->cc;
1607
1608 /* cc->curr_chan = 8; *//* garbage */
1609
1610 /* cc->xds = FALSE; */
1611
1612 if (cc->curr_sp) {
1613 memset(cc->curr_sp, 0, sizeof(*(cc->curr_sp)));
1614 cc->curr_sp = NULL;
1615 }
1616
1617 cc->itv_count = 0;
1618}
1619
1620/**
1621 * @internal
1622 * @param vbi Initialized vbi decoding context.
1623 *
1624 * This function must be called after a channel switch,
1625 * to reset the Closed Caption decoder.
1626 */
1627void
1628vbi_caption_channel_switched(vbi_decoder *vbi)
1629{
1630 struct caption *cc = &vbi->cc;
1631 cc_channel *ch;
1632 int i;
1633
1634 for (i = 0; i < 9; i++) {
1635 ch = &cc->channel[i];
1636
1637 if (i < 4) {
1638 ch->mode = MODE_NONE; // MODE_ROLL_UP;
1639 ch->row = ROWS - 1;
1640 ch->row1 = ROWS - 4;
1641 ch->roll = 4;
1642 } else {
1643 ch->mode = MODE_TEXT;
1644 ch->row1 = ch->row = 0;
1645 ch->roll = ROWS;
1646 }
1647
1648 ch->attr.opacity = VBI_OPAQUE;
1649 ch->attr.foreground = VBI_WHITE;
1650 ch->attr.background = VBI_BLACK;
1651
1652 set_cursor(ch, 1, ch->row);
1653
1654 ch->time = 0.0;
1655
1656 ch->hidden = 0;
1657
1658 ch->pg[0].dirty.y0 = 0;
1659 ch->pg[0].dirty.y1 = ROWS - 1;
1660 ch->pg[0].dirty.roll = 0;
1661
1662 erase_memory(cc, ch, 0);
1663
1664 memcpy(&ch->pg[1], &ch->pg[0], sizeof(ch->pg[1]));
1665 }
1666
1667 cc->xds = FALSE;
1668
1669 memset(&cc->sub_packet, 0, sizeof(cc->sub_packet));
1670
1671 cc->info_cycle[0] = 0;
1672 cc->info_cycle[1] = 0;
1673
1674 vbi_caption_desync(vbi);
1675}
1676
1677static vbi_rgba
1678default_color_map[8] = {
1679 VBI_RGBA(0x00, 0x00, 0x00), VBI_RGBA(0xFF, 0x00, 0x00),
1680 VBI_RGBA(0x00, 0xFF, 0x00), VBI_RGBA(0xFF, 0xFF, 0x00),
1681 VBI_RGBA(0x00, 0x00, 0xFF), VBI_RGBA(0xFF, 0x00, 0xFF),
1682 VBI_RGBA(0x00, 0xFF, 0xFF), VBI_RGBA(0xFF, 0xFF, 0xFF)
1683};
1684
1685/**
1686 * @internal
1687 * @param vbi Initialized vbi decoding context.
1688 *
1689 * After the client changed text brightness and saturation
1690 * this function adjusts the Closed Caption color palette.
1691 */
1692void
1693vbi_caption_color_level(vbi_decoder *vbi)
1694{
1695 int i;
1696
1697 vbi_transp_colormap(vbi, vbi->cc.channel[0].pg[0].color_map,
1698 default_color_map, 8);
1699
1700 for (i = 1; i < 16; i++)
1701 memcpy(vbi->cc.channel[i >> 1].pg[i & 1].color_map,
1702 vbi->cc.channel[0].pg[0].color_map,
1703 sizeof(default_color_map));
1704}
1705
1706/**
1707 * @internal
1708 * @param vbi VBI decoding context.
1709 *
1710 * This function is called during @a vbi destruction
1711 * to destroy Closed Caption subset of @a vbi.
1712 */
1713void
1714vbi_caption_destroy(vbi_decoder *vbi)
1715{
1716 pthread_mutex_destroy(&vbi->cc.mutex);
1717}
1718
1719/**
1720 * @internal
1721 * @param vbi VBI decoding context.
1722 *
1723 * This function is called during @a vbi initialization
1724 * to initialize the Closed Caption subset of @a vbi.
1725 */
1726void
1727vbi_caption_init(vbi_decoder *vbi)
1728{
1729 struct caption *cc = &vbi->cc;
1730 cc_channel *ch;
1731 int i;
1732
1733 memset(cc, 0, sizeof(struct caption));
1734
1735 cc->curr_chan_f1 = 0;
1736 cc->curr_chan_f2 = 2;
1737 cc->curr_chan_f1_d1 = 0;
1738 cc->curr_chan_f1_d2 = 1;
1739 cc->curr_chan_f2_d1 = 2;
1740 cc->curr_chan_f2_d2 = 3;
1741
1742 pthread_mutex_init(&cc->mutex, NULL);
1743
1744 for (i = 0; i < 9; i++) {
1745 ch = &cc->channel[i];
1746
1747 ch->pg[0].vbi = vbi;
1748
1749 ch->pg[0].pgno = i + 1;
1750 ch->pg[0].subno = 0;
1751
1752 ch->pg[0].rows = ROWS;
1753 ch->pg[0].columns = COLUMNS;
1754
1755 ch->pg[0].screen_color = 0;
1756 ch->pg[0].screen_opacity = (i < 4) ? VBI_TRANSPARENT_SPACE : VBI_OPAQUE;
1757
1758 ch->pg[0].font[0] = vbi_font_descriptors; /* English */
1759 ch->pg[0].font[1] = vbi_font_descriptors;
1760
1761 memcpy(&ch->pg[1], &ch->pg[0], sizeof(ch->pg[1]));
1762 memcpy(&ch->pg[2], &ch->pg[0], sizeof(ch->pg[2]));
1763 }
1764
1765 for (i = 0; i < 2; i++) {
1766 cc->transp_space[i].foreground = VBI_WHITE;
1767 cc->transp_space[i].background = VBI_BLACK;
1768 cc->transp_space[i].unicode = 0x0020;
1769 }
1770
1771 cc->transp_space[0].opacity = VBI_TRANSPARENT_SPACE;
1772 cc->transp_space[1].opacity = VBI_OPAQUE;
1773
1774 vbi_caption_channel_switched(vbi);
1775
1776 vbi_caption_color_level(vbi);
1777}
1778
1779/**
1780 * @param vbi Initialized vbi decoding context.
1781 * @param pg Place to store the formatted page.
1782 * @param pgno Page number 1 ... 8 of the page to fetch, see vbi_pgno.
1783 * @param reset @c TRUE resets the vbi_page dirty fields in cache after
1784 * fetching. Pass @c FALSE only if you plan to call this function again
1785 * to update other displays.
1786 *
1787 * Fetches a Closed Caption page designated by @a pgno from the cache,
1788 * formats and stores it in @a pg. CC pages are transmitted basically in
1789 * two modes: at once and character by character ("roll-up" mode).
1790 * Either way you get a snapshot of the page as it should appear on
1791 * screen at present. With vbi_event_handler_add() you can request a
1792 * @c VBI_EVENT_CAPTION event to be notified about pending changes
1793 * (in case of "roll-up" mode that is with each new word received)
1794 * and the vbi_page->dirty fields will mark the lines actually in
1795 * need of updates, to speed up rendering.
1796 *
1797 * Although safe to do, this function is not supposed to be
1798 * called from an event handler, since rendering may block decoding
1799 * for extended periods of time.
1800 *
1801 * @return
1802 * @c FALSE if some error occured.
1803 */
1804vbi_bool
1805vbi_fetch_cc_page(vbi_decoder *vbi, vbi_page *pg, vbi_pgno pgno, vbi_bool reset)
1806{
1807 cc_channel *ch = vbi->cc.channel + ((pgno - 1) & 7);
1808 vbi_page *spg;
1809
1810 reset = reset;
1811
1812 if (pgno < 1 || pgno > 8)
1813 return FALSE;
1814
1815 pthread_mutex_lock(&vbi->cc.mutex);
1816
1817 spg = ch->pg + 2;
1818
1819 memcpy(pg, spg, sizeof(*pg)); /* shortcut? */
1820
1821 spg->dirty.y0 = ROWS;
1822 spg->dirty.y1 = -1;
1823 spg->dirty.roll = 0;
1824
1825 pthread_mutex_unlock(&vbi->cc.mutex);
1826
1827 return 1;
1828}
1829
1830void vbi_refresh_cc(vbi_decoder *vbi)
1831{
1832 cc_channel *ch;
1833 vbi_page *spg;
1834 int i, j;
1835 vbi_event event;
1836 struct timespec now;
1837 int flash;
1838
1839 clock_gettime(CLOCK_REALTIME, &now);
1840
1841 flash = (now.tv_nsec / 250000000) & 1;
1842
1843 pthread_mutex_lock(&vbi->cc.mutex);
1844
1845 if (flash != vbi->cc.flash_state) {
1846 vbi->cc.flash_state = flash;
1847
1848 for (i = 0; i < 8; i++)
1849 {
1850 ch = &vbi->cc.channel[i];
1851 spg = ch->pg + 2;
1852 for (j = 0; j < ROWS * COLUMNS; j++)
1853 {
1854 if (spg->text[j].flash)
1855 {
1856 update(ch);
1857 break;
1858 }
1859 }
1860 }
1861
1862 update_display(vbi);
1863 }
1864
1865 pthread_mutex_unlock(&vbi->cc.mutex);
1866}
1867
1868/*
1869Local variables:
1870c-set-style: K&R
1871c-basic-offset: 8
1872End:
1873*/
1874
generated by cgit at 2024-05-17 15:59:36 (GMT)