2 * Closed Caption Decoding
3 * Copyright (c) 2015 Anshul Maheshwari
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/opt.h"
26 #define SCREEN_ROWS 15
27 #define SCREEN_COLUMNS 32
29 #define SET_FLAG(var, val) ( (var) |= ( 1 << (val)) )
30 #define UNSET_FLAG(var, val) ( (var) &= ~( 1 << (val)) )
31 #define CHECK_FLAG(var, val) ( (var) & ( 1 << (val)) )
33 static const AVRational ms_tb = {1, 1000};
59 CCFONT_UNDERLINED_ITALICS,
64 CCSET_SPECIAL_AMERICAN,
65 CCSET_EXTENDED_SPANISH_FRENCH_MISC,
66 CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH,
69 static const char *charset_overrides[4][128] =
71 [CCSET_BASIC_AMERICAN] = {
84 [CCSET_SPECIAL_AMERICAN] = {
102 [CCSET_EXTENDED_SPANISH_FRENCH_MISC] = {
136 [CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH] = {
172 static const unsigned char pac2_attribs[32][3] = // Color, font, ident
174 { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x40 || 0x60
175 { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x41 || 0x61
176 { CCCOL_GREEN, CCFONT_REGULAR, 0 }, // 0x42 || 0x62
177 { CCCOL_GREEN, CCFONT_UNDERLINED, 0 }, // 0x43 || 0x63
178 { CCCOL_BLUE, CCFONT_REGULAR, 0 }, // 0x44 || 0x64
179 { CCCOL_BLUE, CCFONT_UNDERLINED, 0 }, // 0x45 || 0x65
180 { CCCOL_CYAN, CCFONT_REGULAR, 0 }, // 0x46 || 0x66
181 { CCCOL_CYAN, CCFONT_UNDERLINED, 0 }, // 0x47 || 0x67
182 { CCCOL_RED, CCFONT_REGULAR, 0 }, // 0x48 || 0x68
183 { CCCOL_RED, CCFONT_UNDERLINED, 0 }, // 0x49 || 0x69
184 { CCCOL_YELLOW, CCFONT_REGULAR, 0 }, // 0x4a || 0x6a
185 { CCCOL_YELLOW, CCFONT_UNDERLINED, 0 }, // 0x4b || 0x6b
186 { CCCOL_MAGENTA, CCFONT_REGULAR, 0 }, // 0x4c || 0x6c
187 { CCCOL_MAGENTA, CCFONT_UNDERLINED, 0 }, // 0x4d || 0x6d
188 { CCCOL_WHITE, CCFONT_ITALICS, 0 }, // 0x4e || 0x6e
189 { CCCOL_WHITE, CCFONT_UNDERLINED_ITALICS, 0 }, // 0x4f || 0x6f
190 { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x50 || 0x70
191 { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x51 || 0x71
192 { CCCOL_WHITE, CCFONT_REGULAR, 4 }, // 0x52 || 0x72
193 { CCCOL_WHITE, CCFONT_UNDERLINED, 4 }, // 0x53 || 0x73
194 { CCCOL_WHITE, CCFONT_REGULAR, 8 }, // 0x54 || 0x74
195 { CCCOL_WHITE, CCFONT_UNDERLINED, 8 }, // 0x55 || 0x75
196 { CCCOL_WHITE, CCFONT_REGULAR, 12 }, // 0x56 || 0x76
197 { CCCOL_WHITE, CCFONT_UNDERLINED, 12 }, // 0x57 || 0x77
198 { CCCOL_WHITE, CCFONT_REGULAR, 16 }, // 0x58 || 0x78
199 { CCCOL_WHITE, CCFONT_UNDERLINED, 16 }, // 0x59 || 0x79
200 { CCCOL_WHITE, CCFONT_REGULAR, 20 }, // 0x5a || 0x7a
201 { CCCOL_WHITE, CCFONT_UNDERLINED, 20 }, // 0x5b || 0x7b
202 { CCCOL_WHITE, CCFONT_REGULAR, 24 }, // 0x5c || 0x7c
203 { CCCOL_WHITE, CCFONT_UNDERLINED, 24 }, // 0x5d || 0x7d
204 { CCCOL_WHITE, CCFONT_REGULAR, 28 }, // 0x5e || 0x7e
205 { CCCOL_WHITE, CCFONT_UNDERLINED, 28 } // 0x5f || 0x7f
206 /* total 32 entries */
210 /* +1 is used to compensate null character of string */
211 uint8_t characters[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
212 uint8_t charsets[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
213 uint8_t colors[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
214 uint8_t fonts[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
216 * Bitmask of used rows; if a bit is not set, the
217 * corresponding row is not used.
218 * for setting row 1 use row | (1 << 0)
219 * for setting row 15 use row | (1 << 14)
224 typedef struct CCaptionSubContext {
227 struct Screen screen[2];
230 uint8_t cursor_column;
231 uint8_t cursor_color;
233 uint8_t cursor_charset;
239 /* visible screen time */
243 int64_t last_real_time;
245 /* buffer to store pkt data */
249 } CCaptionSubContext;
252 static av_cold int init_decoder(AVCodecContext *avctx)
255 CCaptionSubContext *ctx = avctx->priv_data;
257 av_bprint_init(&ctx->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
258 /* taking by default roll up to 2 */
259 ctx->mode = CCMODE_ROLLUP;
261 ctx->cursor_row = 10;
262 ret = ff_ass_subtitle_header(avctx, "Monospace",
263 ASS_DEFAULT_FONT_SIZE,
265 ASS_DEFAULT_BACK_COLOR,
268 ASS_DEFAULT_UNDERLINE,
270 ASS_DEFAULT_ALIGNMENT);
278 static av_cold int close_decoder(AVCodecContext *avctx)
280 CCaptionSubContext *ctx = avctx->priv_data;
281 av_bprint_finalize(&ctx->buffer, NULL);
282 av_freep(&ctx->pktbuf);
283 ctx->pktbuf_size = 0;
287 static void flush_decoder(AVCodecContext *avctx)
289 CCaptionSubContext *ctx = avctx->priv_data;
290 ctx->screen[0].row_used = 0;
291 ctx->screen[1].row_used = 0;
292 ctx->prev_cmd[0] = 0;
293 ctx->prev_cmd[1] = 0;
294 ctx->mode = CCMODE_ROLLUP;
296 ctx->cursor_row = 10;
297 ctx->cursor_column = 0;
298 ctx->cursor_font = 0;
299 ctx->cursor_color = 0;
300 ctx->cursor_charset = 0;
301 ctx->active_screen = 0;
302 ctx->last_real_time = 0;
303 ctx->screen_touched = 0;
304 ctx->buffer_changed = 0;
305 if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
307 av_bprint_clear(&ctx->buffer);
311 * @param ctx closed caption context just to print log
313 static void write_char(CCaptionSubContext *ctx, struct Screen *screen, char ch)
315 uint8_t col = ctx->cursor_column;
316 char *row = screen->characters[ctx->cursor_row];
317 char *font = screen->fonts[ctx->cursor_row];
318 char *color = screen->colors[ctx->cursor_row];
319 char *charset = screen->charsets[ctx->cursor_row];
321 if (col < SCREEN_COLUMNS) {
323 font[col] = ctx->cursor_font;
324 color[col] = ctx->cursor_color;
325 charset[col] = ctx->cursor_charset;
326 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
327 if (ch) ctx->cursor_column++;
330 /* We have extra space at end only for null character */
331 else if (col == SCREEN_COLUMNS && ch == 0) {
336 av_log(ctx, AV_LOG_WARNING, "Data Ignored since exceeding screen width\n");
342 * This function after validating parity bit, also remove it from data pair.
343 * The first byte doesn't pass parity, we replace it with a solid blank
344 * and process the pair.
345 * If the second byte doesn't pass parity, it returns INVALIDDATA
346 * user can ignore the whole pair and pass the other pair.
348 static int validate_cc_data_pair(uint8_t *cc_data_pair)
350 uint8_t cc_valid = (*cc_data_pair & 4) >>2;
351 uint8_t cc_type = *cc_data_pair & 3;
354 return AVERROR_INVALIDDATA;
356 // if EIA-608 data then verify parity.
357 if (cc_type==0 || cc_type==1) {
358 if (!av_parity(cc_data_pair[2])) {
359 return AVERROR_INVALIDDATA;
361 if (!av_parity(cc_data_pair[1])) {
362 cc_data_pair[1]=0x7F;
367 if ((cc_data_pair[0] == 0xFA || cc_data_pair[0] == 0xFC || cc_data_pair[0] == 0xFD)
368 && (cc_data_pair[1] & 0x7F) == 0 && (cc_data_pair[2] & 0x7F) == 0)
369 return AVERROR_PATCHWELCOME;
372 if (cc_type == 3 || cc_type == 2)
373 return AVERROR_PATCHWELCOME;
375 /* remove parity bit */
376 cc_data_pair[1] &= 0x7F;
377 cc_data_pair[2] &= 0x7F;
382 static struct Screen *get_writing_screen(CCaptionSubContext *ctx)
386 // use Inactive screen
387 return ctx->screen + !ctx->active_screen;
392 return ctx->screen + ctx->active_screen;
394 /* It was never an option */
398 static void roll_up(CCaptionSubContext *ctx)
400 struct Screen *screen;
403 if (ctx->mode == CCMODE_TEXT)
406 screen = get_writing_screen(ctx);
408 /* +1 signify cursor_row starts from 0
409 * Can't keep lines less then row cursor pos
411 keep_lines = FFMIN(ctx->cursor_row + 1, ctx->rollup);
413 for (i = 0; i < SCREEN_ROWS; i++) {
414 if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row)
416 UNSET_FLAG(screen->row_used, i);
419 for (i = 0; i < keep_lines && screen->row_used; i++) {
420 const int i_row = ctx->cursor_row - keep_lines + i + 1;
422 memcpy(screen->characters[i_row], screen->characters[i_row+1], SCREEN_COLUMNS);
423 memcpy(screen->colors[i_row], screen->colors[i_row+1], SCREEN_COLUMNS);
424 memcpy(screen->fonts[i_row], screen->fonts[i_row+1], SCREEN_COLUMNS);
425 memcpy(screen->charsets[i_row], screen->charsets[i_row+1], SCREEN_COLUMNS);
426 if (CHECK_FLAG(screen->row_used, i_row + 1))
427 SET_FLAG(screen->row_used, i_row);
430 UNSET_FLAG(screen->row_used, ctx->cursor_row);
433 static int capture_screen(CCaptionSubContext *ctx)
436 struct Screen *screen = ctx->screen + ctx->active_screen;
437 enum cc_font prev_font = CCFONT_REGULAR;
438 enum cc_color_code prev_color = CCCOL_WHITE;
439 av_bprint_clear(&ctx->buffer);
441 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
443 if (CHECK_FLAG(screen->row_used, i)) {
444 const char *row = screen->characters[i];
445 const char *charset = screen->charsets[i];
447 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN)
454 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
456 if (CHECK_FLAG(screen->row_used, i)) {
457 const char *row = screen->characters[i];
458 const char *font = screen->fonts[i];
459 const char *color = screen->colors[i];
460 const char *charset = screen->charsets[i];
461 const char *override;
462 int x, y, seen_char = 0;
465 /* skip leading space */
466 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN && j < tab)
469 x = ASS_DEFAULT_PLAYRESX * (0.1 + 0.0250 * j);
470 y = ASS_DEFAULT_PLAYRESY * (0.1 + 0.0533 * i);
471 av_bprintf(&ctx->buffer, "{\\an7}{\\pos(%d,%d)}", x, y);
473 for (; j < SCREEN_COLUMNS; j++) {
474 const char *e_tag = "", *s_tag = "", *c_tag = "";
479 if (prev_font != font[j]) {
484 case CCFONT_UNDERLINED:
487 case CCFONT_UNDERLINED_ITALICS:
488 e_tag = "{\\u0}{\\i0}";
495 case CCFONT_UNDERLINED:
498 case CCFONT_UNDERLINED_ITALICS:
499 s_tag = "{\\u1}{\\i1}";
503 if (prev_color != color[j]) {
506 c_tag = "{\\c&HFFFFFF&}";
509 c_tag = "{\\c&H00FF00&}";
512 c_tag = "{\\c&HFF0000&}";
515 c_tag = "{\\c&HFFFF00&}";
518 c_tag = "{\\c&H0000FF&}";
521 c_tag = "{\\c&H00FFFF&}";
524 c_tag = "{\\c&HFF00FF&}";
530 prev_color = color[j];
531 override = charset_overrides[(int)charset[j]][(int)row[j]];
533 av_bprintf(&ctx->buffer, "%s%s%s%s", e_tag, s_tag, c_tag, override);
535 } else if (row[j] == ' ' && !seen_char) {
536 av_bprintf(&ctx->buffer, "%s%s%s\\h", e_tag, s_tag, c_tag);
538 av_bprintf(&ctx->buffer, "%s%s%s%c", e_tag, s_tag, c_tag, row[j]);
543 av_bprintf(&ctx->buffer, "\\N");
546 if (!av_bprint_is_complete(&ctx->buffer))
547 return AVERROR(ENOMEM);
548 if (screen->row_used && ctx->buffer.len >= 2) {
549 ctx->buffer.len -= 2;
550 ctx->buffer.str[ctx->buffer.len] = 0;
552 ctx->buffer_changed = 1;
556 static int reap_screen(CCaptionSubContext *ctx, int64_t pts)
558 ctx->start_time = ctx->startv_time;
559 ctx->startv_time = pts;
561 return capture_screen(ctx);
564 static void handle_textattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
567 struct Screen *screen = get_writing_screen(ctx);
572 ctx->cursor_color = pac2_attribs[i][0];
573 ctx->cursor_font = pac2_attribs[i][1];
575 SET_FLAG(screen->row_used, ctx->cursor_row);
576 write_char(ctx, screen, ' ');
579 static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
581 static const int8_t row_map[] = {
582 11, -1, 1, 2, 3, 4, 12, 13, 14, 15, 5, 6, 7, 8, 9, 10
584 const int index = ( (hi<<1) & 0x0e) | ( (lo>>5) & 0x01 );
585 struct Screen *screen = get_writing_screen(ctx);
588 if (row_map[index] <= 0) {
589 av_log(ctx, AV_LOG_DEBUG, "Invalid pac index encountered\n");
595 ctx->cursor_row = row_map[index] - 1;
596 ctx->cursor_color = pac2_attribs[lo][0];
597 ctx->cursor_font = pac2_attribs[lo][1];
598 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
599 ctx->cursor_column = 0;
600 indent = pac2_attribs[lo][2];
601 for (i = 0; i < indent; i++) {
602 write_char(ctx, screen, ' ');
607 * @param pts it is required to set end time
609 static int handle_edm(CCaptionSubContext *ctx, int64_t pts)
611 struct Screen *screen = ctx->screen + ctx->active_screen;
614 // In buffered mode, keep writing to screen until it is wiped.
615 // Before wiping the display, capture contents to emit subtitle.
617 ret = reap_screen(ctx, pts);
619 screen->row_used = 0;
621 // In realtime mode, emit an empty caption so the last one doesn't
622 // stay on the screen.
624 ret = reap_screen(ctx, pts);
629 static int handle_eoc(CCaptionSubContext *ctx, int64_t pts)
633 ctx->active_screen = !ctx->active_screen;
635 // In buffered mode, we wait til the *next* EOC and
636 // reap what was already on the screen since the last EOC.
638 ret = handle_edm(ctx,pts);
640 ctx->cursor_column = 0;
642 // In realtime mode, we display the buffered contents (after
643 // flipping the buffer to active above) as soon as EOC arrives.
645 ret = reap_screen(ctx, pts);
650 static void handle_delete_end_of_row(CCaptionSubContext *ctx)
652 struct Screen *screen = get_writing_screen(ctx);
653 write_char(ctx, screen, 0);
656 static void handle_char(CCaptionSubContext *ctx, char hi, char lo)
658 struct Screen *screen = get_writing_screen(ctx);
660 SET_FLAG(screen->row_used, ctx->cursor_row);
664 ctx->cursor_charset = CCSET_SPECIAL_AMERICAN;
667 if (ctx->cursor_column > 0)
668 ctx->cursor_column -= 1;
669 ctx->cursor_charset = CCSET_EXTENDED_SPANISH_FRENCH_MISC;
672 if (ctx->cursor_column > 0)
673 ctx->cursor_column -= 1;
674 ctx->cursor_charset = CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH;
677 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
678 write_char(ctx, screen, hi);
683 write_char(ctx, screen, lo);
685 write_char(ctx, screen, 0);
687 if (ctx->mode != CCMODE_POPON)
688 ctx->screen_touched = 1;
691 ff_dlog(ctx, "(%c,%c)\n", hi, lo);
693 ff_dlog(ctx, "(%c)\n", hi);
696 static int process_cc608(CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint8_t lo)
700 if (hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) {
704 /* set prev command */
705 ctx->prev_cmd[0] = hi;
706 ctx->prev_cmd[1] = lo;
708 if ( (hi == 0x10 && (lo >= 0x40 && lo <= 0x5f)) ||
709 ( (hi >= 0x11 && hi <= 0x17) && (lo >= 0x40 && lo <= 0x7f) ) ) {
710 handle_pac(ctx, hi, lo);
711 } else if ( ( hi == 0x11 && lo >= 0x20 && lo <= 0x2f ) ||
712 ( hi == 0x17 && lo >= 0x2e && lo <= 0x2f) ) {
713 handle_textattr(ctx, hi, lo);
714 } else if (hi == 0x14 || hi == 0x15 || hi == 0x1c) {
717 /* resume caption loading */
718 ctx->mode = CCMODE_POPON;
721 handle_delete_end_of_row(ctx);
726 ctx->rollup = lo - 0x23;
727 ctx->mode = CCMODE_ROLLUP;
730 /* resume direct captioning */
731 ctx->mode = CCMODE_PAINTON;
734 /* resume text display */
735 ctx->mode = CCMODE_TEXT;
738 /* erase display memory */
739 handle_edm(ctx, pts);
742 /* carriage return */
743 ff_dlog(ctx, "carriage return\n");
745 ret = reap_screen(ctx, pts);
747 ctx->cursor_column = 0;
750 /* erase buffered (non displayed) memory */
751 // Only in realtime mode. In buffered mode, we re-use the inactive screen
752 // for our own buffering.
753 if (ctx->real_time) {
754 struct Screen *screen = ctx->screen + !ctx->active_screen;
755 screen->row_used = 0;
760 ff_dlog(ctx, "handle_eoc\n");
761 ret = handle_eoc(ctx, pts);
764 ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
767 } else if (hi >= 0x11 && hi <= 0x13) {
768 /* Special characters */
769 handle_char(ctx, hi, lo);
770 } else if (hi >= 0x20) {
771 /* Standard characters (always in pairs) */
772 handle_char(ctx, hi, lo);
773 ctx->prev_cmd[0] = ctx->prev_cmd[1] = 0;
774 } else if (hi == 0x17 && lo >= 0x21 && lo <= 0x23) {
776 /* Tab offsets (spacing) */
777 for (i = 0; i < lo - 0x20; i++) {
778 handle_char(ctx, ' ', 0);
781 /* Ignoring all other non data code */
782 ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
788 static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
790 CCaptionSubContext *ctx = avctx->priv_data;
791 AVSubtitle *sub = data;
792 const int64_t start_time = sub->pts;
793 uint8_t *bptr = NULL;
794 int len = avpkt->size;
798 av_fast_padded_malloc(&ctx->pktbuf, &ctx->pktbuf_size, len);
800 av_log(ctx, AV_LOG_WARNING, "Insufficient Memory of %d truncated to %d\n", len, ctx->pktbuf_size);
801 return AVERROR(ENOMEM);
803 memcpy(ctx->pktbuf, avpkt->data, len);
806 for (i = 0; i < len; i += 3) {
807 uint8_t cc_type = *(bptr + i) & 3;
808 if (validate_cc_data_pair(bptr + i))
810 /* ignoring data field 1 */
814 ret = process_cc608(ctx, start_time, *(bptr + i + 1) & 0x7f, *(bptr + i + 2) & 0x7f);
819 if (!ctx->buffer_changed)
821 ctx->buffer_changed = 0;
823 if (*ctx->buffer.str || ctx->real_time)
825 ff_dlog(ctx, "cdp writing data (%s)\n",ctx->buffer.str);
826 ret = ff_ass_add_rect(sub, ctx->buffer.str, ctx->readorder++, 0, NULL, NULL);
829 sub->pts = ctx->start_time;
831 sub->end_display_time = av_rescale_q(ctx->end_time - ctx->start_time,
832 AV_TIME_BASE_Q, ms_tb);
834 sub->end_display_time = -1;
835 ctx->buffer_changed = 0;
836 ctx->last_real_time = sub->pts;
837 ctx->screen_touched = 0;
841 if (ctx->real_time && ctx->screen_touched &&
842 sub->pts > ctx->last_real_time + av_rescale_q(200, ms_tb, AV_TIME_BASE_Q)) {
843 ctx->last_real_time = sub->pts;
844 ctx->screen_touched = 0;
847 ctx->buffer_changed = 0;
849 ret = ff_ass_add_rect(sub, ctx->buffer.str, ctx->readorder++, 0, NULL, NULL);
852 sub->end_display_time = -1;
855 *got_sub = sub->num_rects > 0;
859 #define OFFSET(x) offsetof(CCaptionSubContext, x)
860 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
861 static const AVOption options[] = {
862 { "real_time", "emit subtitle events as they are decoded for real-time display", OFFSET(real_time), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, SD },
866 static const AVClass ccaption_dec_class = {
867 .class_name = "Closed caption Decoder",
868 .item_name = av_default_item_name,
870 .version = LIBAVUTIL_VERSION_INT,
873 AVCodec ff_ccaption_decoder = {
875 .long_name = NULL_IF_CONFIG_SMALL("Closed Caption (EIA-608 / CEA-708)"),
876 .type = AVMEDIA_TYPE_SUBTITLE,
877 .id = AV_CODEC_ID_EIA_608,
878 .priv_data_size = sizeof(CCaptionSubContext),
879 .init = init_decoder,
880 .close = close_decoder,
881 .flush = flush_decoder,
883 .priv_class = &ccaption_dec_class,