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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 assert(length > 0 && length <= 32);
164
165// XXX we have no indication how long the program info applies.
166// It will be canceled on channel switch, but who knows
167// what the station transmits when the next program starts.
168// (Nothing, possibly.) A timeout seems necessary.
169
170 switch (_class) {
171 case XDS_CURRENT: /* 0 */
172 case XDS_FUTURE: /* 1 */
173 if (!(vbi->event_mask & (VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO | VBI_EVENT_RATING))){
174 XDS_SEP_DEBUG("vbi->event_mask & VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO");
175 return;
176 }
177 pi = &vbi->prog_info[_class];
178 neq = 0;
179
180 switch (type) {
181 case 1: /* program identification number */
182 {
183 int month, day, hour, min;
184
185 if (length != 4)
186 return;
187
188 month = buffer[3] & 15;
189 day = buffer[2] & 31;
190 hour = buffer[1] & 31;
191 min = buffer[0] & 63;
192
193 if (month == 0 || month > 12
194 || day == 0 || day > 31
195 || hour > 23 || min > 59)
196 return;
197
198 month--;
199 day--;
200
201 neq = (pi->month ^ month) | (pi->day ^ day)
202 | (pi->hour ^ hour) | (pi->min ^ min);
203
204 pi->tape_delayed = !!(buffer[3] & 0x10);
205
206 if (neq) {
207 flush_prog_info(vbi, pi, &e);
208
209 pi->month = month;
210 pi->day = day;
211 pi->hour = hour;
212 pi->min = min;
213
214 pi->tape_delayed = !!(buffer[3] & 0x10);
215 }
216
217 break;
218 }
219
220 case 2: /* program length */
221 {
222 int lhour, lmin, ehour = -1, emin = -1, esec = 0;
223
224 if (length < 2 || length > 6)
225 return;
226
227 lhour = buffer[1] & 63;
228 lmin = buffer[0] & 63;
229
230 if (length >= 3) {
231 ehour = buffer[3] & 63;
232 emin = buffer[2] & 63;
233
234 if (length >= 5)
235 esec = buffer[4] & 63;
236 }
237
238 if (lmin > 59 || emin > 59 || esec > 59)
239 return;
240
241 xds_intfu(pi->length_hour, lhour);
242 xds_intfu(pi->length_min, lmin);
243 xds_intfu(pi->elapsed_hour, ehour);
244 xds_intfu(pi->elapsed_min, emin);
245 xds_intfu(pi->elapsed_sec, esec);
246
247 break;
248 }
249
250 case 3: /* program name */
251 if (length < 2)
252 return;
253
254 neq = xds_strfu(pi->title, buffer, length);
255
256 if (!neq) { /* no title change */
257 if (!(vbi->cc.info_cycle[_class] & (1 << 3)))
258 break; /* already reported */
259
260 if (!(vbi->cc.info_cycle[_class] & (1 << 1))) {
261 /* Second occurence without PIN */
262
263 flush_prog_info(vbi, pi, &e);
264
265 xds_strfu(pi->title, buffer, length);
266 vbi->cc.info_cycle[_class] |= 1 << 3;
267 }
268 }
269
270 break;
271
272 case 4: /* program type */
273 {
274 int neq;
275
276 neq = (pi->type_classf != VBI_PROG_CLASSF_EIA_608);
277 pi->type_classf = VBI_PROG_CLASSF_EIA_608;
278
279 for (i = 0; i < length; i++) {
280 neq |= pi->type_id[i] ^ buffer[i];
281 pi->type_id[i] = buffer[i];
282 }
283
284 neq |= pi->type_id[i];
285 pi->type_id[i] = 0;
286
287 break;
288 }
289
290 case 5: /* program rating */
291 {
292 vbi_rating_auth auth;
293 int r, g, dlsv = 0;
294
295 if (length != 2)
296 return;
297
298 r = buffer[0] & 7;
299 g = buffer[1] & 7;
300 XDS_SEP_DEBUG("r = %d,g = %d\n",r,g);
301 if (buffer[0] & 0x20)
302 dlsv |= VBI_RATING_D;
303 if (buffer[1] & 0x08)
304 dlsv |= VBI_RATING_L;
305 if (buffer[1] & 0x10)
306 dlsv |= VBI_RATING_S;
307 if (buffer[1] & 0x20)
308 dlsv |= VBI_RATING_V;
309
310 if ((buffer[0] & 0x08) == 0) {
311 //if (r == 0) return;
312 auth = VBI_RATING_AUTH_MPAA;
313 pi->rating.dlsv = dlsv = 0;
314 } else if ((buffer[0] & 0x10) == 0) {
315 auth = VBI_RATING_AUTH_TV_US;
316 r = g;
317 } else if ((buffer[1] & 0x08) == 0) {
318 if ((buffer[0] & 0x20) == 0) {
319 if ((r = g) > 6) return;
320 auth = VBI_RATING_AUTH_TV_CA_EN;
321 } else {
322 if ((r = g) > 5) return;
323 auth = VBI_RATING_AUTH_TV_CA_FR;
324 }
325 pi->rating.dlsv = dlsv = 0;
326 } else
327 return;
328
329 if ((neq = (pi->rating.auth != auth
330 || pi->rating.id != r
331 || pi->rating.dlsv != dlsv))) {
332 pi->rating.auth = auth;
333 pi->rating.id = r;
334 pi->rating.dlsv = dlsv;
335 }
336 if (vbi->event_mask & VBI_EVENT_RATING){
337 e.type = VBI_EVENT_RATING;
338 e.ev.prog_info = pi;
339 caption_send_event(vbi, &e);
340 }
341
342 break;
343 }
344
345 case 6: /* program audio services */
346 {
347 static const vbi_audio_mode mode[2][8] = {
348 {
349 VBI_AUDIO_MODE_UNKNOWN,
350 VBI_AUDIO_MODE_MONO,
351 VBI_AUDIO_MODE_SIMULATED_STEREO,
352 VBI_AUDIO_MODE_STEREO,
353 VBI_AUDIO_MODE_STEREO_SURROUND,
354 VBI_AUDIO_MODE_DATA_SERVICE,
355 VBI_AUDIO_MODE_UNKNOWN, /* "other" */
356 VBI_AUDIO_MODE_NONE
357 }, {
358 VBI_AUDIO_MODE_UNKNOWN,
359 VBI_AUDIO_MODE_MONO,
360 VBI_AUDIO_MODE_VIDEO_DESCRIPTIONS,
361 VBI_AUDIO_MODE_NON_PROGRAM_AUDIO,
362 VBI_AUDIO_MODE_SPECIAL_EFFECTS,
363 VBI_AUDIO_MODE_DATA_SERVICE,
364 VBI_AUDIO_MODE_UNKNOWN, /* "other" */
365 VBI_AUDIO_MODE_NONE
366 }
367 };
368
369 if (length != 2)
370 return;
371
372 for (i = 0; i < 2; i++) {
373 int l = (buffer[i] >> 3) & 7;
374 vbi_audio_mode m = mode[i][buffer[i] & 7];
375 /* should be const char *, but I got that
376 wrong and cannot change the public
377 pi->audio[].language type now. */
378 unsigned char *s = ((1 << l) & 0xC1) ? NULL :
379 (unsigned char *) language[l];
380
381 if (pi->audio[i].mode != m) {
382 neq = 1; pi->audio[i].mode = m;
383 }
384 if (pi->audio[i].language != s) {
385 neq = 1; pi->audio[i].language = s;
386 }
387 }
388
389 break;
390 }
391
392 case 7: /* program caption services */
393 {
394 int services = 0;
395
396 if (length > 8)
397 return;
398
399 for (i = 0; i < 8; i++)
400 pi->caption_language[i] = NULL;
401
402 for (i = 0; i < length; i++) {
403 int ch = buffer[i] & 7;
404 int l = (buffer[i] >> 3) & 7;
405 /* should be const char *, but I got that
406 wrong and cannot change the public
407 pi->audio[].language type now. */
408 unsigned char *s;
409
410 ch = (ch & 1) * 4 + (ch >> 1);
411
412 services |= 1 << ch;
413 s = ((1 << l) & 0xC1) ? NULL :
414 (unsigned char *) language[l];
415
416 if (pi->caption_language[ch] != (unsigned char *) s) {
417 neq = 1; pi->caption_language[ch] = (unsigned char *) s;
418 }
419
420 if (_class == XDS_CURRENT)
421 vbi->cc.channel[ch].language =
422 pi->caption_language[ch];
423 }
424
425 xds_intfu(pi->caption_services, services);
426
427 break;
428 }
429
430 case 8: /* copy generation management system */
431 if (length != 1)
432 return;
433
434 xds_intfu(pi->cgms_a, buffer[0] & 63);
435
436 break;
437
438 case 9: /* program aspect ratio */
439 {
440 vbi_aspect_ratio *r = &e.ev.aspect;
441
442 if (length > 3)
443 return;
444
445 memset(&e, 0, sizeof(e));
446
447 r->first_line = (buffer[0] & 63) + 22;
448 r->last_line = 262 - (buffer[1] & 63);
449 r->film_mode = 0;
450 r->open_subtitles = VBI_SUBT_UNKNOWN;
451
452 if (length >= 3 && (buffer[2] & 1))
453 r->ratio = 16.0 / 9.0;
454 else
455 r->ratio = 1.0;
456
457 if (memcmp(r, &vbi->prog_info[0].aspect, sizeof(*r)) != 0) {
458 vbi->prog_info[0].aspect = *r;
459 vbi->aspect_source = 3;
460
461 e.type = VBI_EVENT_ASPECT;
462 caption_send_event(vbi, &e);
463
464 neq = 1;
465 }
466
467 break;
468 }
469
470 case 0x10 ... 0x17: /* program description */
471 {
472 int line = type & 7;
473
474 neq = xds_strfu(pi->description[line], buffer, length);
475
476 break;
477 }
478
479 default:
480 return; /* no event */
481 }
482
483 if (0)
484 printf("[type %d cycle %08x class %d neq %d]\n",
485 type, vbi->cc.info_cycle[_class], _class, neq);
486
487 if (neq){ /* first occurence of this type with this data */
488 vbi->cc.info_cycle[_class] |= 1 << type;
489 }
490 else if (vbi->cc.info_cycle[_class] & (1 << type)) {
491 /* Second occurance of this type with same data */
492
493 e.type = VBI_EVENT_PROG_INFO;
494 e.ev.prog_info = pi;
495
496 caption_send_event(vbi, &e);
497 XDS_SEP_DEBUG("caption_send_event VBI_EVENT_PROG_INFO\n");
498 vbi->cc.info_cycle[_class] = 0; /* all changes reported */
499 }
500
501 break;
502
503 case XDS_CHANNEL:
504 n->ts_id = -1;
505
506 switch (type) {
507 case 1: /* network name */
508 if (xds_strfu(n->name, buffer, length)) {
509 n->cycle = 1;
510 } else if (n->cycle == 1) {
511 signed char *s = n->name;
512 uint32_t sum;
513
514 if (n->call[0])
515 s = n->call;
516
517 for (sum = 0; *s; s++)
518 sum = (sum >> 7) ^ hcrc[(sum ^ *s) & 0x7F];
519
520 sum &= ((1UL << 31) - 1);
521 sum |= 1UL << 30;
522
523 if (n->nuid != 0)
524 vbi_chsw_reset(vbi, sum);
525
526 n->nuid = sum;
527
528 vbi->network.type = VBI_EVENT_NETWORK;
529 caption_send_event(vbi, &vbi->network);
530
531 vbi->network.type = VBI_EVENT_NETWORK_ID;
532 caption_send_event(vbi, &vbi->network);
533
534 n->cycle = 3;
535 }
536
537 break;
538
539 case 2: /* network call letters */
540 if (xds_strfu(n->call, buffer, length)) {
541 if (n->cycle != 1) {
542 n->name[0] = 0;
543 n->cycle = 0;
544 }
545 }
546
547 break;
548
549 case 3: /* channel tape delay */
550 if (length != 2)
551 return;
552
553 n->tape_delay =
554 (buffer[1] & 31) * 60 + (buffer[0] & 63);
555
556 break;
557
558 case 4: /* Transmission Signal ID */
559 if (length < 4)
560 return;
561
562 n->ts_id =
563 ((buffer[3] & 15) << 0)
564 |((buffer[2] & 15) << 4)
565 |((buffer[1] & 15) << 8)
566 |((buffer[0] & 15) << 12);
567
568 vbi->network.type = VBI_EVENT_NETWORK;
569 caption_send_event(vbi, &vbi->network);
570 break;
571
572 default:
573 break;
574 }
575
576 break;
577
578 case XDS_MISC:
579 switch (type) {
580 case 1: /* time of day */
581 if (length != 6)
582 return;
583 break;
584
585 case 2: /* impulse capture id */
586 if (length != 6)
587 return;
588 break;
589
590 case 3: /* supplemental data location */
591 break;
592
593 case 4: /* local time zone */
594 if (length != 1)
595 return;
596 break;
597
598 case 0x40: /* out-of-band channel number */
599 if (length != 2)
600 return;
601 break;
602
603 default:
604 break;
605 }
606
607 break;
608
609 default:
610 break;
611 }
612}
613
614static void
615xds_separator(vbi_decoder *vbi, uint8_t *buf)
616{
617 struct caption *cc = &vbi->cc;
618 xds_sub_packet *sp = cc->curr_sp;
619 int c1 = vbi_unpar8 (buf[0]);
620 int c2 = vbi_unpar8 (buf[1]);
621 unsigned int class, type;
622
623 XDS_SEP_DEBUG("XDS %02x %02x\n", buf[0], buf[1]);
624
625 if ((c1 | c2) < 0) {
626 XDS_SEP_DEBUG("XDS tx error, discard current packet\n");
627
628 if (sp) {
629 sp->count = 0;
630 sp->chksum = 0;
631 sp = NULL;
632 }
633
634 return;
635 }
636
637 switch (c1) {
638 case 1 ... 14:
639 class = (c1 - 1) >> 1;
640
641 if (class > elements(cc->sub_packet)
642 || c2 > (int) elements(cc->sub_packet[0])) {
643 XDS_SEP_DEBUG("XDS ignore packet %d/0x%02x\n", class, c2);
644 cc->curr_sp = NULL;
645 return;
646 }
647
648 cc->curr_sp = sp = &cc->sub_packet[class][c2];
649
650 if (c1 & 1) { /* start */
651 sp->chksum = c1 + c2;
652 sp->count = 2;
653 } else if (!sp->count) {
654 XDS_SEP_DEBUG("XDS can't continue %d/0x%02x\n", class, c2);
655 cc->curr_sp = NULL;
656 }
657
658 return;
659
660 case 15:
661 if (!sp)
662 return;
663
664 sp->chksum += c1 + c2;
665
666 class = (sp - cc->sub_packet[0]) / elements(cc->sub_packet[0]);
667 type = (sp - cc->sub_packet[0]) % elements(cc->sub_packet[0]);
668
669 if (sp->chksum & 0x7F) {
670 XDS_SEP_DEBUG("XDS ignore packet %d/0x%02x, "
671 "checksum error\n", class, type);
672 } else if (sp->count <= 2) {
673 XDS_SEP_DEBUG("XDS ignore empty packet "
674 "%d/0x%02x\n", class, type);
675 } else {
676 xds_decoder(vbi, class, type, sp->buffer, sp->count - 2);
677
678 XDS_SEP_DUMP(
679 for (i = 0; i < sp->count - 2; i++)
680 printf("%c", (sp->buffer[i])); //printf("%c", _vbi_to_ascii (sp->buffer[i]));
681 printf(" %d/0x%02x\n", class, type);
682 )
683 }
684
685 sp->count = 0;
686 sp->chksum = 0;
687 cc->curr_sp = NULL;
688
689 return;
690
691 case 0x20 ... 0x7F:
692 if (!sp)
693 return;
694
695 if (sp->count >= 32 + 2) {
696 XDS_SEP_DEBUG("XDS packet length overflow, discard %d/0x%02x\n",
697 (sp - cc->sub_packet[0]) / elements(cc->sub_packet[0]),
698 (sp - cc->sub_packet[0]) % elements(cc->sub_packet[0]));
699
700 sp->count = 0;
701 sp->chksum = 0;
702 cc->curr_sp = NULL;
703 return;
704 }
705
706 sp->buffer[sp->count - 2] = c1;
707 sp->buffer[sp->count - 1] = c2;
708 sp->chksum += c1 + c2;
709 sp->count += 1 + !!c2;
710
711 return;
712
713 default:
714 assert(!"reached");
715 }
716}
717
718static void
719itv_separator(vbi_decoder *vbi, struct caption *cc, char c)
720{
721 if (ITV_DEBUG(0 &&) !(vbi->event_mask & VBI_EVENT_TRIGGER))
722 return;
723
724 if (c >= 0x20) {
725 if (c == '<') // s4-nbc omitted CR
726 itv_separator(vbi, cc, 0);
727 else if (cc->itv_count > (int) sizeof(cc->itv_buf) - 2)
728 cc->itv_count = 0;
729
730 cc->itv_buf[cc->itv_count++] = c;
731
732 return;
733 }
734
735 cc->itv_buf[cc->itv_count] = 0;
736 cc->itv_count = 0;
737
738 ITV_DEBUG(printf("ITV: <%s>\n", cc->itv_buf));
739
740 vbi_atvef_trigger(vbi, cc->itv_buf);
741}
742
743/*
744 * Closed Caption decoder
745 */
746
747#define ROWS 15
748#define COLUMNS 34
749
750static void
751render(vbi_page *pg, int row)
752{
753 vbi_event event;
754
755 if (row < 0 || pg->dirty.roll) {
756 /* no particular row or not fetched
757 since last roll/clear, redraw all */
758 pg->dirty.y0 = 0;
759 pg->dirty.y1 = ROWS - 1;
760 pg->dirty.roll = 0;
761 } else {
762 pg->dirty.y0 = MIN(row, pg->dirty.y0);
763 pg->dirty.y1 = MAX(row, pg->dirty.y1);
764 }
765
766 event.type = VBI_EVENT_CAPTION;
767 event.ev.caption.pgno = pg->pgno;
768
769 caption_send_event(pg->vbi, &event);
770}
771
772static void
773clear(vbi_page *pg)
774{
775 vbi_event event;
776
777 pg->dirty.y0 = 0;
778 pg->dirty.y1 = ROWS - 1;
779 pg->dirty.roll = -ROWS;
780
781 event.type = VBI_EVENT_CAPTION;
782 event.ev.caption.pgno = pg->pgno;
783
784 caption_send_event(pg->vbi, &event);
785}
786
787static void
788roll_up(vbi_page *pg, int first_row, int last_row)
789{
790 vbi_event event;
791
792 if (pg->dirty.roll != 0 || pg->dirty.y0 <= pg->dirty.y1) {
793 /* not fetched since last update, redraw all */
794 pg->dirty.roll = 0;
795 pg->dirty.y0 = MIN(first_row, pg->dirty.y0);
796 pg->dirty.y1 = MAX(last_row, pg->dirty.y1);
797 } else {
798 pg->dirty.roll = -1;
799 pg->dirty.y0 = first_row;
800 pg->dirty.y1 = last_row;
801 }
802
803 event.type = VBI_EVENT_CAPTION;
804 event.ev.caption.pgno = pg->pgno;
805
806 caption_send_event(pg->vbi, &event);
807}
808
809static inline void
810update(cc_channel *ch)
811{
812#if 1
813int i;
814 vbi_char *acp = ch->line - ch->pg[ch->hidden].text + ch->pg[ch->hidden^1].text;
815
816 memcpy(acp, ch->line, sizeof(*acp) * COLUMNS);
817 render(&ch->pg[ch->hidden^1], ch->row);
818#if 0
819 AM_DEBUG(1,"+++ Display line");
820 for (i=0;i<sizeof(*acp) * COLUMNS;i++)
821 {
822 AM_DEBUG(1,"+++ %x ", ch->line[i].unicode);
823 }
824#endif
825#endif
826}
827
828static void
829word_break(struct caption *cc, cc_channel *ch, int upd)
830{
831 cc = cc;
832
833 /*
834 * Add a leading and trailing space.
835 */
836#if 0
837 if (ch->col > ch->col1) {
838 vbi_char c = ch->line[ch->col1];
839
840 if ((c.unicode & 0x7F) != 0x20
841 && ch->line[ch->col1 - 1].opacity == VBI_TRANSPARENT_SPACE) {
842 c.unicode = 0x20;
843 ch->line[ch->col1 - 1] = c;
844 }
845
846 c = ch->line[ch->col - 1];
847
848 if ((c.unicode & 0x7F) != 0x20
849 && ch->line[ch->col].opacity == VBI_TRANSPARENT_SPACE) {
850 c.unicode = 0x20;
851 ch->line[ch->col] = c;
852 }
853 }
854#endif
855 if (!upd || ch->mode == MODE_POP_ON)
856 return;
857
858 /*
859 * NB we render only at spaces (end of word) and
860 * before cursor motions and mode switching, to keep the
861 * drawing efforts (scaling etc) at a minimum. update()
862 * for double buffering at word granularity.
863 *
864 * XXX should not render if space follows space,
865 * but force in long words.
866 */
867 ch->update = 1;
868}
869
870static inline void
871set_cursor(cc_channel *ch, int col, int row)
872{
873 ch->col = ch->col1 = col;
874 ch->row = row;
875
876 ch->line = ch->pg[ch->hidden].text + row * COLUMNS;
877}
878
879static void
880put_char(struct caption *cc, cc_channel *ch, vbi_char c)
881{
882 /* c.foreground = rand() & 7; */
883 /* c.background = rand() & 7; */
884
885 if (ch->col < COLUMNS - 1)
886 ch->line[ch->col++] = c;
887 else {
888 /* line break here? */
889
890 ch->line[COLUMNS - 2] = c;
891 }
892 if (ch->mode == MODE_POP_ON)
893 return;
894 ch->update = 1;
895 //if ((c.unicode & 0x7F) == 0x20)
896 // word_break(cc, ch, 1);
897 //AM_DEBUG(1, "add render in putchar");
898}
899
900static inline cc_channel *
901switch_channel(struct caption *cc, cc_channel *ch, int new_chan)
902{
903 word_break(cc, ch, 1); // we leave for a number of frames
904
905 return &cc->channel[cc->curr_chan = new_chan];
906}
907
908static void
909erase_memory(struct caption *cc, cc_channel *ch, int page)
910{
911 vbi_page *pg = ch->pg + page;
912 vbi_char *acp = pg->text;
913 memset(pg->text, 0, sizeof(pg->text));
914#if 0
915 //vbi_char c = cc->transp_space[ch >= &cc->channel[4]];
916 vbi_char c = {0};
917 int i,j;
918 for (i = 0; i < COLUMNS * ROWS; acp++, i++)
919 *acp = c;
920
921 pg->dirty.y0 = 0;
922 pg->dirty.y1 = ROWS - 1;
923 pg->dirty.roll = ROWS;
924#endif
925}
926
927static const vbi_color
928palette_mapping[8] = {
929 VBI_WHITE, VBI_GREEN, VBI_BLUE, VBI_CYAN,
930 VBI_RED, VBI_YELLOW, VBI_MAGENTA, VBI_BLACK
931};
932
933static int
934row_mapping[] = {
935 10, -1, 0, 1, 2, 3, 11, 12, 13, 14, 4, 5, 6, 7, 8, 9
936};
937
938// not verified means I didn't encounter the code in a
939// sample stream yet
940
941_vbi_inline void
942caption_command(vbi_decoder *vbi, struct caption *cc,
943 unsigned char c1, unsigned char c2, vbi_bool field2)
944{
945 XDS_SEP_DEBUG("caption_command\n");
946 cc_channel *ch;
947 vbi_char *c;
948 int chan, col, i;
949 int last_row;
950 chan = (cc->curr_chan & 4) + field2 * 2 + ((c1 >> 3) & 1);
951 ch = &cc->channel[chan];
952
953 c1 &= 7;
954
955 if (c2 >= 0x40) { /* Preamble Address Codes 001 crrr 1ri xxxu */
956 int row = row_mapping[(c1 << 1) + ((c2 >> 5) & 1)];
957 int old_row = ch->row;
958
959 if (row < 0 || !ch->mode)
960 return;
961
962 ch->attr.underline = c2 & 1;
963 ch->attr.background = VBI_BLACK;
964 ch->attr.opacity = VBI_OPAQUE;
965 ch->attr.flash = FALSE;
966
967 word_break(cc, ch, 1);
968
969 if (ch->mode == MODE_ROLL_UP) {
970 int row1 = row - ch->roll + 1;
971
972 if (row1 < 0)
973 row1 = 0;
974
975 if (row1 != ch->row1) {
976 ch->row1 = row1;
977 erase_memory(cc, ch, ch->hidden);
978 erase_memory(cc, ch, ch->hidden ^ 1);
979 }
980
981 set_cursor(ch, 1, ch->row1 + ch->roll - 1);
982 } else
983 set_cursor(ch, 1, row);
984
985 if (c2 & 0x10) {
986 /*
987 col = ch->col;
988
989 for (i = (c2 & 14) * 2; i > 0 && col < COLUMNS - 1; i--)
990 ch->line[col++] = cc->transp_space[chan >> 2];
991
992 if (col > ch->col)
993 ch->col = ch->col1 = col;
994 */
995
996 ch->col = (c2 & 14) * 2 + 1;
997
998 if (old_row != ch->row) {
999 ch->attr.italic = FALSE;
1000 ch->attr.foreground = VBI_WHITE;
1001 }
1002 } else {
1003// not verified
1004 c2 = (c2 >> 1) & 7;
1005
1006 if (c2 < 7) {
1007 ch->attr.italic = FALSE;
1008 ch->attr.foreground = palette_mapping[c2];
1009 } else {
1010 ch->attr.italic = TRUE;
1011 //ch->attr.foreground = VBI_WHITE;
1012 }
1013 }
1014
1015 return;
1016 }
1017
1018 switch (c1) {
1019 case 0:
1020 /* Optional Attributes 001 c000 010 xxxt */
1021 ch->attr.opacity = (c2 & 1) ? VBI_SEMI_TRANSPARENT : VBI_OPAQUE;
1022 ch->attr.background = palette_mapping[(c2 >> 1) & 7];
1023 //AM_DEBUG(1, "background_set %x %x %x", ch->line[ch->col].unicode, ch->line[ch->col-1].unicode, ch->line[ch->col-2].unicode);
1024 for (i=0; i<2 && ((ch->col - i) >= 0); i++)
1025 {
1026 if (ch->col < COLUMNS - 1)
1027 c = &ch->line[ch->col - i];
1028 else {
1029 /* line break here? */
1030 c = &ch->line[COLUMNS - 2 - i];
1031 }
1032 if (c->unicode == 0x20)
1033 {
1034 c->background = ch->attr.background;
1035 c->opacity = ch->attr.opacity;
1036 }
1037 }
1038 return;
1039
1040 case 1:
1041 if (c2 & 0x10) { /* Special Characters 001 c001 011 xxxx */
1042// not verified
1043 c2 &= 15;
1044
1045 if (c2 == 9) { // "transparent space"
1046 if (ch->col < COLUMNS - 1) {
1047 ch->line[ch->col++] = cc->transp_space[chan >> 2];
1048 ch->col1 = ch->col;
1049 } else
1050 ch->line[COLUMNS - 2] = cc->transp_space[chan >> 2];
1051 // XXX boxed logic?
1052 } else {
1053 vbi_char c = ch->attr;
1054
1055 c.unicode = vbi_caption_unicode (0x1130 | (c2 & 15),
1056 /* to_upper */ FALSE);
1057 XDS_SEP_DEBUG("vbi_caption_unicode %c\n",c.unicode);
1058 put_char(cc, ch, c);
1059 }
1060 } else { /* Midrow Codes 001 c001 010 xxxu */
1061// not verified
1062 ch->attr.flash = FALSE;
1063 ch->attr.underline = c2 & 1;
1064
1065 c2 = (c2 >> 1) & 7;
1066
1067 if (c2 < 7) {
1068 ch->attr.italic = FALSE;
1069 ch->attr.foreground = palette_mapping[c2];
1070 } else {
1071 ch->attr.italic = TRUE;
1072 //ch->attr.foreground = VBI_WHITE;
1073 }
1074 }
1075
1076 return;
1077
1078 case 2: /* Optional Extended Characters 001 c01f 01x xxxx */
1079 case 3:
1080 /* Send specs to the maintainer of this code */
1081 {
1082 vbi_char c;
1083
1084 c = ch->attr;
1085 c.unicode = vbi_caption_unicode((c1 << 8) | c2 | 0x1000, 0);
1086
1087 if (c.unicode) {
1088 if (ch->col > 1)
1089 ch->col --;
1090
1091 put_char(cc, ch, c);
1092 }
1093 }
1094 return;
1095
1096 case 4: /* Misc Control Codes 001 c10f 010 xxxx */
1097 case 5: /* Misc Control Codes 001 c10f 010 xxxx */
1098 /* f ("field"): purpose? */
1099
1100 switch (c2 & 15) {
1101 case 0: /* Resume Caption Loading 001 c10f 010 0000 */
1102 ch = switch_channel(cc, ch, chan & 3);
1103
1104 ch->mode = MODE_POP_ON;
1105
1106// no? erase_memory(cc, ch);
1107
1108 return;
1109
1110 /* case 4: reserved */
1111
1112 case 5: /* Roll-Up Captions 001 c10f 010 0xxx */
1113 case 6:
1114 case 7:
1115 {
1116 int roll = (c2 & 7) - 3;
1117
1118 ch = switch_channel(cc, ch, chan & 3);
1119
1120 if (ch->mode == MODE_ROLL_UP && ch->roll == roll)
1121 return;
1122
1123 erase_memory(cc, ch, ch->hidden);
1124 erase_memory(cc, ch, ch->hidden ^ 1);
1125
1126 ch->mode = MODE_ROLL_UP;
1127 ch->roll = roll;
1128
1129 set_cursor(ch, 1, 14);
1130
1131 ch->row1 = 14 - roll + 1;
1132
1133 return;
1134 }
1135
1136 case 9: /* Resume Direct Captioning 001 c10f 010 1001 */
1137// not verified
1138 ch = switch_channel(cc, ch, chan & 3);
1139 ch->mode = MODE_PAINT_ON;
1140 return;
1141
1142 case 10: /* Text Restart 001 c10f 010 1010 */
1143// not verified
1144 erase_memory(cc, ch, ch->hidden);
1145 erase_memory(cc, ch, ch->hidden ^ 1);
1146 ch = switch_channel(cc, ch, chan | 4);
1147 set_cursor(ch, 1, 0);
1148 erase_memory(cc, ch, ch->hidden);
1149 erase_memory(cc, ch, ch->hidden ^ 1);
1150 return;
1151
1152 case 11: /* Resume Text Display 001 c10f 010 1011 */
1153 ch = switch_channel(cc, ch, chan | 4);
1154 return;
1155
1156 case 15: /* End Of Caption 001 c10f 010 1111 */
1157 ch = switch_channel(cc, ch, chan & 3);
1158 ch->mode = MODE_POP_ON;
1159
1160 word_break(cc, ch, 1);
1161
1162 ch->hidden ^= 1;
1163
1164 render(ch->pg + (ch->hidden ^ 1), -1 /* ! */);
1165
1166 erase_memory(cc, ch, ch->hidden); // yes?
1167
1168 /*
1169 * A Preamble Address Code should follow,
1170 * reset to a known state to be safe.
1171 * Reset ch->line for new ch->hidden.
1172 * XXX row 0?
1173 */
1174 set_cursor(ch, 1, ROWS - 1);
1175
1176 return;
1177
1178 case 8: /* Flash On 001 c10f 010 1000 */
1179// not verified
1180 ch->attr.flash = TRUE;
1181 return;
1182
1183 case 1: /* Backspace 001 c10f 010 0001 */
1184// not verified
1185 if (ch->mode) {
1186 if (ch->col > 1) {
1187 if (ch->line[ch->col - 1].unicode == 0)
1188 return;
1189 ch->col --;
1190 } else if (ch->row > 0) {
1191 vbi_char *acp;
1192
1193 ch->row --;
1194 ch->line = ch->pg[ch->hidden].text + ch->row * COLUMNS;
1195 ch->col1 = 1;
1196 ch->col = COLUMNS - 1;
1197 acp = ch->line + COLUMNS - 1;
1198
1199 while (ch->col > 1) {
1200 if (acp->unicode != 0)
1201 break;
1202
1203 acp --;
1204 ch->col --;
1205 }
1206 } else {
1207 return;
1208 }
1209
1210 memset(&ch->line[ch->col], 0, sizeof(vbi_char));
1211 if (ch->col < ch->col1)
1212 ch->col1 = ch->col;
1213 ch->update = 1;
1214 }
1215
1216 return;
1217
1218 case 13: /* Carriage Return 001 c10f 010 1101 */
1219 if (ch == cc->channel + 5)
1220 itv_separator(vbi, cc, 0);
1221
1222 if (!ch->mode)
1223 return;
1224
1225 last_row = ch->row1 + ch->roll - 1;
1226
1227 if (last_row > ROWS - 1)
1228 last_row = ROWS - 1;
1229
1230 if (ch->row < last_row) {
1231 word_break(cc, ch, 1);
1232 set_cursor(ch, 1, ch->row + 1);
1233 } else {
1234 vbi_char *acp = &ch->pg[ch->hidden ^ (ch->mode != MODE_POP_ON)]
1235 .text[ch->row1 * COLUMNS];
1236
1237 word_break(cc, ch, 1);
1238 ch->update = 1;
1239
1240 /*if (ch->mode == MODE_ROLL_UP) */
1241 {
1242 memmove(acp, acp + COLUMNS, sizeof(*acp) * (ch->roll - 1) * COLUMNS);
1243 for (i = 0; i <= COLUMNS; i++) {
1244 memset(&ch->line[i], 0, sizeof(vbi_char));
1245 }
1246 }
1247
1248 if (ch->mode != MODE_POP_ON) {
1249 ch->update = 1;
1250 roll_up(ch->pg + (ch->hidden ^ 1), ch->row1, last_row);
1251 }
1252
1253 ch->col1 = ch->col = 1;
1254 }
1255 ch->attr.underline = FALSE;
1256 ch->attr.background = VBI_BLACK;
1257 ch->attr.opacity = VBI_OPAQUE;
1258 ch->attr.flash = FALSE;
1259 ch->attr.italic = FALSE;
1260 ch->attr.foreground = VBI_WHITE;
1261
1262 return;
1263
1264 case 4: /* Delete To End Of Row 001 c10f 010 0100 */
1265// not verified
1266 if (!ch->mode)
1267 return;
1268
1269 for (i = ch->col; i <= COLUMNS - 1; i++) {
1270 memset(&ch->line[i], 0, sizeof(vbi_char));
1271 }
1272
1273 word_break(cc, ch, 0);
1274
1275 if (ch->mode != MODE_POP_ON) {
1276 ch->update = 1;
1277 render(ch->pg + (ch->hidden ^ 1), ch->row);
1278 }
1279
1280 ch->update = 1;
1281 return;
1282
1283 case 12: /* Erase Displayed Memory 001 c10f 010 1100 */
1284// s1, s4: EDM always before EOC
1285 /* Received in text mode */
1286 /*
1287 if (cc->curr_chan >= 4)
1288 {
1289 for (i = 0; i < 2; i++ )
1290 {
1291 ch = &cc->channel[i + (cc->curr_chan - 4)/2];
1292 erase_memory(cc, ch, 0);
1293 erase_memory(cc, ch, 1);
1294 }
1295 }
1296 else
1297 {
1298
1299 if (ch->mode != MODE_POP_ON)
1300 erase_memory(cc, ch, ch->hidden);
1301
1302 erase_memory(cc, ch, ch->hidden ^ 1);
1303
1304
1305 clear(ch->pg + (ch->hidden ^ 1));
1306 }*/
1307
1308 if (cc->curr_chan < 4) {
1309 //erase_memory(cc, ch, ch->hidden);
1310 erase_memory(cc, ch, ch->hidden ^ 1);
1311 clear(ch->pg + (ch->hidden ^ 1));
1312
1313 ch->update = 1;
1314 }
1315 return;
1316 case 14: /* Erase Non-Displayed Memory 001 c10f 010 1110 */
1317// not verified
1318 /*if (ch->mode == MODE_POP_ON)*/
1319 erase_memory(cc, ch, ch->hidden);
1320
1321 //erase_memory(cc, ch, ch->hidden ^ 1);
1322 //ch->update = 1;
1323 return;
1324 }
1325
1326 return;
1327
1328 /* case 6: reserved */
1329
1330 case 7:
1331 if (!ch->mode)
1332 return;
1333
1334 switch (c2) {
1335 case 0x21 ... 0x23: /* Misc Control Codes, Tabs 001 c111 010 00xx */
1336// not verified
1337 /*
1338 col = ch->col;
1339
1340 for (i = c2 & 3; i > 0 && col < COLUMNS - 1; i--)
1341 ch->line[col++] = cc->transp_space[chan >> 2];
1342
1343 if (col > ch->col)
1344 ch->col = ch->col1 = col;*/
1345
1346 ch->col += (c2 & 3);
1347 if (ch->col >= COLUMNS)
1348 ch->col = COLUMNS - 1;
1349
1350 return;
1351
1352 case 0x2D: /* Optional Attributes 001 c111 010 11xx */
1353// not verified
1354 ch->attr.opacity = VBI_TRANSPARENT_FULL;
1355 break;
1356
1357 case 0x2E: /* Optional Attributes 001 c111 010 11xx */
1358 case 0x2F:
1359// not verified
1360 ch->attr.foreground = VBI_BLACK;
1361 ch->attr.underline = c2 & 1;
1362 break;
1363
1364 default:
1365 return;
1366 }
1367
1368 /* Optional Attributes, backspace magic */
1369
1370 if (ch->col > 1 && (ch->line[ch->col - 1].unicode & 0x7F) == 0x20) {
1371 vbi_char c = ch->attr;
1372
1373 c.unicode = 0x0020;
1374 ch->line[ch->col - 1] = c;
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
1396 pthread_mutex_lock(&cc->mutex);
1397 //AM_DEBUG(1, "vbi_data: line: %d %x %x", line, buf[0], buf[1]);
1398
1399 if (line == 21) {
1400 cc->curr_chan = cc->curr_chan_f1;
1401 memcpy(cc->last, cc->last_f1, sizeof(cc->last));
1402 } else {
1403 cc->curr_chan = cc->curr_chan_f2;
1404 memcpy(cc->last, cc->last_f2, sizeof(cc->last));
1405 }
1406
1407 switch (line) {
1408 case 21: /* NTSC */
1409 case 22: /* PAL */
1410 field2 = 0;
1411 break;
1412
1413 case 335: /* PAL, hardly XDS */
1414 break;
1415
1416 case 284: /* NTSC */
1417 CC_DUMP(
1418 putchar(_vbi_to_ascii (buf[0]));
1419 putchar(_vbi_to_ascii (buf[1]));
1420 fflush(stdout);
1421 )
1422
1423 if (vbi_unpar8 (buf[0]) >= 0) { //vbi_unpar8 (buf[0]) >= 0
1424 if (c1 == 0) {
1425 goto finish;
1426 } else if (c1 <= 0x0F) {
1427 xds_separator(vbi, buf);
1428 cc->xds = (c1 != XDS_END);
1429 goto finish;
1430 } else if (c1 <= 0x1F) {
1431 cc->xds = FALSE;
1432 } else if (cc->xds) {
1433 xds_separator(vbi, buf);
1434 goto finish;
1435 }
1436 } else if (cc->xds) {
1437 xds_separator(vbi, buf);
1438 goto finish;
1439 }
1440
1441 break;
1442
1443 default:
1444 goto finish;
1445 }
1446
1447 //if ( (buf[0]) < 0) { //vbi_unpar8 (buf[0]) < 0
1448 if ( vbi_unpar8 (buf[0]) < 0) { //
1449#if 0
1450 c1 = 127;
1451 buf[0] = c1; /* traditional 'bad' glyph, ccfont has */
1452 buf[1] = c1; /* room, design a special glyph? */
1453#else
1454 goto finish;
1455#endif
1456 }
1457
1458 CC_DUMP(
1459 putchar(_vbi_to_ascii (buf[0]));
1460 putchar(_vbi_to_ascii (buf[1]));
1461 fflush(stdout);
1462 )
1463
1464 switch (c1) {
1465 cc_channel *ch;
1466 vbi_char c;
1467
1468 case 0x01 ... 0x0F:
1469 /*if (!field2)*/
1470 cc->last[0] = 0;
1471 break; /* XDS field 1?? */
1472
1473 case 0x10 ... 0x1F:
1474 //if ( (buf[1]) >= 0) { // vbi_unpar8 (buf[1])
1475 if ( vbi_unpar8 (buf[1]) >= 0) {
1476 if (/*!field2
1477 &&*/ buf[0] == cc->last[0]
1478 && buf[1] == cc->last[1]) {
1479 /* cmd repetition F1: already executed */
1480 cc->last[0] = 0; /* one rep */
1481 break;
1482 }
1483
1484 caption_command(vbi, cc, c1, buf[1] & 0x7F, field2);
1485
1486 /*if (!field2)*/ {
1487 cc->last[0] = buf[0];
1488 cc->last[1] = buf[1];
1489 }
1490 } else /*if (!field2)*/
1491 cc->last[0] = 0;
1492
1493 break;
1494
1495 default:
1496 CC_TEXT_DUMP(
1497 putchar(_vbi_to_ascii (buf[0]));
1498 putchar(_vbi_to_ascii (buf[1]));
1499 fflush(stdout);
1500 )
1501#if 0
1502 AM_DEBUG(1, "text value: %c %c %x %x", _vbi_to_ascii(buf[0]),
1503 _vbi_to_ascii(buf[1]), buf[0], buf[1]);
1504#endif
1505
1506 ch = &cc->channel[(cc->curr_chan & 5) + field2 * 2];
1507
1508 if (buf[0] == 0x80 && buf[1] == 0x80) {
1509 if (ch->mode) {
1510 if (ch->nul_ct == 2)
1511 word_break(cc, ch, 1);
1512 ch->nul_ct += 2;
1513 }
1514
1515 break;
1516 }
1517
1518 /*if (!field2)*/
1519 cc->last[0] = 0;
1520
1521 ch->nul_ct = 0;
1522
1523 if (!ch->mode)
1524 break;
1525
1526 ch->time = vbi->time; /* activity measure */
1527
1528 c = ch->attr;
1529
1530 for (i = 0; i < 2; i++) {
1531 //char ci = (buf[i]) & 0x7F; /* 127 if bad */ //vbi_unpar8 (buf[i])
1532 char ci = vbi_unpar8 (buf[i]) & 0x7F; /* 127 if bad */
1533 if (ci <= 0x1F) /* 0x00 no char, 0x01 ... 0x1F invalid */
1534 continue;
1535
1536 if (ch == cc->channel + 5) // 'T2'
1537 itv_separator(vbi, cc, ci);
1538
1539 c.unicode = vbi_caption_unicode(ci, /* to_upper */ FALSE);
1540
1541 put_char(cc, ch, c);
1542 }
1543 }
1544 for (i=0; i<8; i++)
1545 {
1546 if (cc->channel[i].update == 1)
1547 update(&cc->channel[i]);
1548 cc->channel[i].update = 0;
1549 }
1550
1551 if (line == 21) {
1552 cc->curr_chan_f1 = cc->curr_chan;
1553 memcpy(cc->last_f1, cc->last, sizeof(cc->last));
1554 } else {
1555 cc->curr_chan_f2 = cc->curr_chan;
1556 memcpy(cc->last_f2, cc->last, sizeof(cc->last));
1557 }
1558
1559 finish:
1560 pthread_mutex_unlock(&cc->mutex);
1561}
1562
1563/**
1564 * @internal
1565 * @param vbi Initialized vbi decoding context.
1566 *
1567 * This function must be called after desynchronisation
1568 * has been detected (i. e. vbi data has been lost)
1569 * to reset the Closed Caption decoder.
1570 */
1571void
1572vbi_caption_desync(vbi_decoder *vbi)
1573{
1574 struct caption *cc = &vbi->cc;
1575
1576 /* cc->curr_chan = 8; *//* garbage */
1577
1578 /* cc->xds = FALSE; */
1579
1580 if (cc->curr_sp) {
1581 memset(cc->curr_sp, 0, sizeof(*(cc->curr_sp)));
1582 cc->curr_sp = NULL;
1583 }
1584
1585 cc->itv_count = 0;
1586}
1587
1588/**
1589 * @internal
1590 * @param vbi Initialized vbi decoding context.
1591 *
1592 * This function must be called after a channel switch,
1593 * to reset the Closed Caption decoder.
1594 */
1595void
1596vbi_caption_channel_switched(vbi_decoder *vbi)
1597{
1598 struct caption *cc = &vbi->cc;
1599 cc_channel *ch;
1600 int i;
1601
1602 for (i = 0; i < 9; i++) {
1603 ch = &cc->channel[i];
1604
1605 if (i < 4) {
1606 ch->mode = MODE_NONE; // MODE_ROLL_UP;
1607 ch->row = ROWS - 1;
1608 ch->row1 = ROWS - 3;
1609 ch->roll = 3;
1610 } else {
1611 ch->mode = MODE_TEXT;
1612 ch->row1 = ch->row = 0;
1613 ch->roll = ROWS;
1614 }
1615
1616 ch->attr.opacity = VBI_OPAQUE;
1617 ch->attr.foreground = VBI_WHITE;
1618 ch->attr.background = VBI_BLACK;
1619
1620 set_cursor(ch, 1, ch->row);
1621
1622 ch->time = 0.0;
1623
1624 ch->hidden = 0;
1625
1626 ch->pg[0].dirty.y0 = 0;
1627 ch->pg[0].dirty.y1 = ROWS - 1;
1628 ch->pg[0].dirty.roll = 0;
1629
1630 erase_memory(cc, ch, 0);
1631
1632 memcpy(&ch->pg[1], &ch->pg[0], sizeof(ch->pg[1]));
1633 }
1634
1635 cc->xds = FALSE;
1636
1637 memset(&cc->sub_packet, 0, sizeof(cc->sub_packet));
1638
1639 cc->info_cycle[0] = 0;
1640 cc->info_cycle[1] = 0;
1641
1642 vbi_caption_desync(vbi);
1643}
1644
1645static vbi_rgba
1646default_color_map[8] = {
1647 VBI_RGBA(0x00, 0x00, 0x00), VBI_RGBA(0xFF, 0x00, 0x00),
1648 VBI_RGBA(0x00, 0xFF, 0x00), VBI_RGBA(0xFF, 0xFF, 0x00),
1649 VBI_RGBA(0x00, 0x00, 0xFF), VBI_RGBA(0xFF, 0x00, 0xFF),
1650 VBI_RGBA(0x00, 0xFF, 0xFF), VBI_RGBA(0xFF, 0xFF, 0xFF)
1651};
1652
1653/**
1654 * @internal
1655 * @param vbi Initialized vbi decoding context.
1656 *
1657 * After the client changed text brightness and saturation
1658 * this function adjusts the Closed Caption color palette.
1659 */
1660void
1661vbi_caption_color_level(vbi_decoder *vbi)
1662{
1663 int i;
1664
1665 vbi_transp_colormap(vbi, vbi->cc.channel[0].pg[0].color_map,
1666 default_color_map, 8);
1667
1668 for (i = 1; i < 16; i++)
1669 memcpy(vbi->cc.channel[i >> 1].pg[i & 1].color_map,
1670 vbi->cc.channel[0].pg[0].color_map,
1671 sizeof(default_color_map));
1672}
1673
1674/**
1675 * @internal
1676 * @param vbi VBI decoding context.
1677 *
1678 * This function is called during @a vbi destruction
1679 * to destroy Closed Caption subset of @a vbi.
1680 */
1681void
1682vbi_caption_destroy(vbi_decoder *vbi)
1683{
1684 pthread_mutex_destroy(&vbi->cc.mutex);
1685}
1686
1687/**
1688 * @internal
1689 * @param vbi VBI decoding context.
1690 *
1691 * This function is called during @a vbi initialization
1692 * to initialize the Closed Caption subset of @a vbi.
1693 */
1694void
1695vbi_caption_init(vbi_decoder *vbi)
1696{
1697 struct caption *cc = &vbi->cc;
1698 cc_channel *ch;
1699 int i;
1700
1701 memset(cc, 0, sizeof(struct caption));
1702
1703 pthread_mutex_init(&cc->mutex, NULL);
1704
1705 for (i = 0; i < 9; i++) {
1706 ch = &cc->channel[i];
1707
1708 ch->pg[0].vbi = vbi;
1709
1710 ch->pg[0].pgno = i + 1;
1711 ch->pg[0].subno = 0;
1712
1713 ch->pg[0].rows = ROWS;
1714 ch->pg[0].columns = COLUMNS;
1715
1716 ch->pg[0].screen_color = 0;
1717 ch->pg[0].screen_opacity = (i < 4) ? VBI_TRANSPARENT_SPACE : VBI_OPAQUE;
1718
1719 ch->pg[0].font[0] = vbi_font_descriptors; /* English */
1720 ch->pg[0].font[1] = vbi_font_descriptors;
1721
1722 memcpy(&ch->pg[1], &ch->pg[0], sizeof(ch->pg[1]));
1723 }
1724
1725 for (i = 0; i < 2; i++) {
1726 cc->transp_space[i].foreground = VBI_WHITE;
1727 cc->transp_space[i].background = VBI_BLACK;
1728 cc->transp_space[i].unicode = 0x0020;
1729 }
1730
1731 cc->transp_space[0].opacity = VBI_TRANSPARENT_SPACE;
1732 cc->transp_space[1].opacity = VBI_OPAQUE;
1733
1734 vbi_caption_channel_switched(vbi);
1735
1736 vbi_caption_color_level(vbi);
1737}
1738
1739/**
1740 * @param vbi Initialized vbi decoding context.
1741 * @param pg Place to store the formatted page.
1742 * @param pgno Page number 1 ... 8 of the page to fetch, see vbi_pgno.
1743 * @param reset @c TRUE resets the vbi_page dirty fields in cache after
1744 * fetching. Pass @c FALSE only if you plan to call this function again
1745 * to update other displays.
1746 *
1747 * Fetches a Closed Caption page designated by @a pgno from the cache,
1748 * formats and stores it in @a pg. CC pages are transmitted basically in
1749 * two modes: at once and character by character ("roll-up" mode).
1750 * Either way you get a snapshot of the page as it should appear on
1751 * screen at present. With vbi_event_handler_add() you can request a
1752 * @c VBI_EVENT_CAPTION event to be notified about pending changes
1753 * (in case of "roll-up" mode that is with each new word received)
1754 * and the vbi_page->dirty fields will mark the lines actually in
1755 * need of updates, to speed up rendering.
1756 *
1757 * Although safe to do, this function is not supposed to be
1758 * called from an event handler, since rendering may block decoding
1759 * for extended periods of time.
1760 *
1761 * @return
1762 * @c FALSE if some error occured.
1763 */
1764vbi_bool
1765vbi_fetch_cc_page(vbi_decoder *vbi, vbi_page *pg, vbi_pgno pgno, vbi_bool reset)
1766{
1767 cc_channel *ch = vbi->cc.channel + ((pgno - 1) & 7);
1768 vbi_page *spg;
1769
1770 reset = reset;
1771
1772 if (pgno < 1 || pgno > 8)
1773 return FALSE;
1774
1775 pthread_mutex_lock(&vbi->cc.mutex);
1776
1777 spg = ch->pg + (ch->hidden ^ 1);
1778
1779 memcpy(pg, spg, sizeof(*pg)); /* shortcut? */
1780
1781 spg->dirty.y0 = ROWS;
1782 spg->dirty.y1 = -1;
1783 spg->dirty.roll = 0;
1784
1785 pthread_mutex_unlock(&vbi->cc.mutex);
1786
1787 return 1;
1788}
1789
1790void vbi_refresh_cc(vbi_decoder *vbi)
1791{
1792 cc_channel *ch;
1793 vbi_page *spg;
1794 int i, j;
1795 int flash_flag = 0;
1796 vbi_event event;
1797 pthread_mutex_lock(&vbi->cc.mutex);
1798 for (i = 0; i < 8; i++)
1799 {
1800 flash_flag = 0;
1801 ch = &vbi->cc.channel[i];
1802 spg = ch->pg + (ch->hidden ^ 1);
1803 for (j = 0; j < sizeof(spg->text)/sizeof(vbi_char); j++)
1804 {
1805 if (spg->text[j].flash)
1806 {
1807 flash_flag = 1;
1808 break;
1809 }
1810 }
1811 if (flash_flag)
1812 {
1813 update(ch);
1814 }
1815 }
1816 pthread_mutex_unlock(&vbi->cc.mutex);
1817}
1818
1819/*
1820Local variables:
1821c-set-style: K&R
1822c-basic-offset: 8
1823End:
1824*/
1825
generated by cgit at 2024-05-16 08:34:56 (GMT)