FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ccaption_dec.c
Date: 2025-03-08 20:38:41
Exec Total Coverage
Lines: 276 427 64.6%
Functions: 15 18 83.3%
Branches: 166 268 61.9%
Line Branch Exec Source
1 /*
2 * Closed Caption Decoding
3 * Copyright (c) 2015 Anshul Maheshwari
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include <assert.h>
23 #include "avcodec.h"
24 #include "ass.h"
25 #include "codec_internal.h"
26 #include "libavutil/opt.h"
27
28 #define SCREEN_ROWS 15
29 #define SCREEN_COLUMNS 32
30
31 #define SET_FLAG(var, val) ( (var) |= ( 1 << (val)) )
32 #define UNSET_FLAG(var, val) ( (var) &= ~( 1 << (val)) )
33 #define CHECK_FLAG(var, val) ( (var) & ( 1 << (val)) )
34
35 static const AVRational ms_tb = {1, 1000};
36
37 enum cc_mode {
38 CCMODE_POPON,
39 CCMODE_PAINTON,
40 CCMODE_ROLLUP,
41 CCMODE_TEXT,
42 };
43
44 enum cc_color_code {
45 CCCOL_WHITE,
46 CCCOL_GREEN,
47 CCCOL_BLUE,
48 CCCOL_CYAN,
49 CCCOL_RED,
50 CCCOL_YELLOW,
51 CCCOL_MAGENTA,
52 CCCOL_USERDEFINED,
53 CCCOL_BLACK,
54 CCCOL_TRANSPARENT,
55 };
56
57 enum cc_font {
58 CCFONT_REGULAR,
59 CCFONT_ITALICS,
60 CCFONT_UNDERLINED,
61 CCFONT_UNDERLINED_ITALICS,
62 };
63
64 enum cc_charset {
65 CCSET_BASIC_AMERICAN,
66 CCSET_SPECIAL_AMERICAN,
67 CCSET_EXTENDED_SPANISH_FRENCH_MISC,
68 CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH,
69 };
70
71 #define CHARSET_OVERRIDE_LIST(START_SET, ENTRY, END_SET) \
72 START_SET(CCSET_BASIC_AMERICAN) \
73 ENTRY(0x27, "\u2019") \
74 ENTRY(0x2a, "\u00e1") \
75 ENTRY(0x5c, "\u00e9") \
76 ENTRY(0x5e, "\u00ed") \
77 ENTRY(0x5f, "\u00f3") \
78 ENTRY(0x60, "\u00fa") \
79 ENTRY(0x7b, "\u00e7") \
80 ENTRY(0x7c, "\u00f7") \
81 ENTRY(0x7d, "\u00d1") \
82 ENTRY(0x7e, "\u00f1") \
83 ENTRY(0x7f, "\u2588") \
84 END_SET \
85 START_SET(CCSET_SPECIAL_AMERICAN) \
86 ENTRY(0x30, "\u00ae") \
87 ENTRY(0x31, "\u00b0") \
88 ENTRY(0x32, "\u00bd") \
89 ENTRY(0x33, "\u00bf") \
90 ENTRY(0x34, "\u2122") \
91 ENTRY(0x35, "\u00a2") \
92 ENTRY(0x36, "\u00a3") \
93 ENTRY(0x37, "\u266a") \
94 ENTRY(0x38, "\u00e0") \
95 ENTRY(0x39, "\u00A0") \
96 ENTRY(0x3a, "\u00e8") \
97 ENTRY(0x3b, "\u00e2") \
98 ENTRY(0x3c, "\u00ea") \
99 ENTRY(0x3d, "\u00ee") \
100 ENTRY(0x3e, "\u00f4") \
101 ENTRY(0x3f, "\u00fb") \
102 END_SET \
103 START_SET(CCSET_EXTENDED_SPANISH_FRENCH_MISC) \
104 ENTRY(0x20, "\u00c1") \
105 ENTRY(0x21, "\u00c9") \
106 ENTRY(0x22, "\u00d3") \
107 ENTRY(0x23, "\u00da") \
108 ENTRY(0x24, "\u00dc") \
109 ENTRY(0x25, "\u00fc") \
110 ENTRY(0x26, "\u00b4") \
111 ENTRY(0x27, "\u00a1") \
112 ENTRY(0x28, "*") \
113 ENTRY(0x29, "\u2018") \
114 ENTRY(0x2a, "-") \
115 ENTRY(0x2b, "\u00a9") \
116 ENTRY(0x2c, "\u2120") \
117 ENTRY(0x2d, "\u00b7") \
118 ENTRY(0x2e, "\u201c") \
119 ENTRY(0x2f, "\u201d") \
120 ENTRY(0x30, "\u00c0") \
121 ENTRY(0x31, "\u00c2") \
122 ENTRY(0x32, "\u00c7") \
123 ENTRY(0x33, "\u00c8") \
124 ENTRY(0x34, "\u00ca") \
125 ENTRY(0x35, "\u00cb") \
126 ENTRY(0x36, "\u00eb") \
127 ENTRY(0x37, "\u00ce") \
128 ENTRY(0x38, "\u00cf") \
129 ENTRY(0x39, "\u00ef") \
130 ENTRY(0x3a, "\u00d4") \
131 ENTRY(0x3b, "\u00d9") \
132 ENTRY(0x3c, "\u00f9") \
133 ENTRY(0x3d, "\u00db") \
134 ENTRY(0x3e, "\u00ab") \
135 ENTRY(0x3f, "\u00bb") \
136 END_SET \
137 START_SET(CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH) \
138 ENTRY(0x20, "\u00c3") \
139 ENTRY(0x21, "\u00e3") \
140 ENTRY(0x22, "\u00cd") \
141 ENTRY(0x23, "\u00cc") \
142 ENTRY(0x24, "\u00ec") \
143 ENTRY(0x25, "\u00d2") \
144 ENTRY(0x26, "\u00f2") \
145 ENTRY(0x27, "\u00d5") \
146 ENTRY(0x28, "\u00f5") \
147 ENTRY(0x29, "{") \
148 ENTRY(0x2a, "}") \
149 ENTRY(0x2b, "\\") \
150 ENTRY(0x2c, "^") \
151 ENTRY(0x2d, "_") \
152 ENTRY(0x2e, "|") \
153 ENTRY(0x2f, "~") \
154 ENTRY(0x30, "\u00c4") \
155 ENTRY(0x31, "\u00e4") \
156 ENTRY(0x32, "\u00d6") \
157 ENTRY(0x33, "\u00f6") \
158 ENTRY(0x34, "\u00df") \
159 ENTRY(0x35, "\u00a5") \
160 ENTRY(0x36, "\u00a4") \
161 ENTRY(0x37, "\u00a6") \
162 ENTRY(0x38, "\u00c5") \
163 ENTRY(0x39, "\u00e5") \
164 ENTRY(0x3a, "\u00d8") \
165 ENTRY(0x3b, "\u00f8") \
166 ENTRY(0x3c, "\u250c") \
167 ENTRY(0x3d, "\u2510") \
168 ENTRY(0x3e, "\u2514") \
169 ENTRY(0x3f, "\u2518") \
170 END_SET \
171
172 static const char charset_overrides[4][128][sizeof("\u266a")] =
173 {
174 #define START_SET(IDX) \
175 [IDX] = {
176 #define ENTRY(idx, string) \
177 [idx] = string,
178 #define END_SET \
179 },
180 CHARSET_OVERRIDE_LIST(START_SET, ENTRY, END_SET)
181 };
182 #define EMPTY_START(IDX)
183 #define EMPTY_END
184 #define ASSERT_ENTRY(IDX, str) \
185 static_assert(sizeof(str) <= sizeof(charset_overrides[0][0]), \
186 "'" str "' string takes too much space");
187 CHARSET_OVERRIDE_LIST(EMPTY_START, ASSERT_ENTRY, EMPTY_END)
188
189 static const unsigned char bg_attribs[8] = // Color
190 {
191 CCCOL_WHITE,
192 CCCOL_GREEN,
193 CCCOL_BLUE,
194 CCCOL_CYAN,
195 CCCOL_RED,
196 CCCOL_YELLOW,
197 CCCOL_MAGENTA,
198 CCCOL_BLACK,
199 };
200
201 static const unsigned char pac2_attribs[32][3] = // Color, font, ident
202 {
203 { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x40 || 0x60
204 { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x41 || 0x61
205 { CCCOL_GREEN, CCFONT_REGULAR, 0 }, // 0x42 || 0x62
206 { CCCOL_GREEN, CCFONT_UNDERLINED, 0 }, // 0x43 || 0x63
207 { CCCOL_BLUE, CCFONT_REGULAR, 0 }, // 0x44 || 0x64
208 { CCCOL_BLUE, CCFONT_UNDERLINED, 0 }, // 0x45 || 0x65
209 { CCCOL_CYAN, CCFONT_REGULAR, 0 }, // 0x46 || 0x66
210 { CCCOL_CYAN, CCFONT_UNDERLINED, 0 }, // 0x47 || 0x67
211 { CCCOL_RED, CCFONT_REGULAR, 0 }, // 0x48 || 0x68
212 { CCCOL_RED, CCFONT_UNDERLINED, 0 }, // 0x49 || 0x69
213 { CCCOL_YELLOW, CCFONT_REGULAR, 0 }, // 0x4a || 0x6a
214 { CCCOL_YELLOW, CCFONT_UNDERLINED, 0 }, // 0x4b || 0x6b
215 { CCCOL_MAGENTA, CCFONT_REGULAR, 0 }, // 0x4c || 0x6c
216 { CCCOL_MAGENTA, CCFONT_UNDERLINED, 0 }, // 0x4d || 0x6d
217 { CCCOL_WHITE, CCFONT_ITALICS, 0 }, // 0x4e || 0x6e
218 { CCCOL_WHITE, CCFONT_UNDERLINED_ITALICS, 0 }, // 0x4f || 0x6f
219 { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x50 || 0x70
220 { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x51 || 0x71
221 { CCCOL_WHITE, CCFONT_REGULAR, 4 }, // 0x52 || 0x72
222 { CCCOL_WHITE, CCFONT_UNDERLINED, 4 }, // 0x53 || 0x73
223 { CCCOL_WHITE, CCFONT_REGULAR, 8 }, // 0x54 || 0x74
224 { CCCOL_WHITE, CCFONT_UNDERLINED, 8 }, // 0x55 || 0x75
225 { CCCOL_WHITE, CCFONT_REGULAR, 12 }, // 0x56 || 0x76
226 { CCCOL_WHITE, CCFONT_UNDERLINED, 12 }, // 0x57 || 0x77
227 { CCCOL_WHITE, CCFONT_REGULAR, 16 }, // 0x58 || 0x78
228 { CCCOL_WHITE, CCFONT_UNDERLINED, 16 }, // 0x59 || 0x79
229 { CCCOL_WHITE, CCFONT_REGULAR, 20 }, // 0x5a || 0x7a
230 { CCCOL_WHITE, CCFONT_UNDERLINED, 20 }, // 0x5b || 0x7b
231 { CCCOL_WHITE, CCFONT_REGULAR, 24 }, // 0x5c || 0x7c
232 { CCCOL_WHITE, CCFONT_UNDERLINED, 24 }, // 0x5d || 0x7d
233 { CCCOL_WHITE, CCFONT_REGULAR, 28 }, // 0x5e || 0x7e
234 { CCCOL_WHITE, CCFONT_UNDERLINED, 28 } // 0x5f || 0x7f
235 /* total 32 entries */
236 };
237
238 struct Screen {
239 /* +1 is used to compensate null character of string */
240 uint8_t characters[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
241 uint8_t charsets[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
242 uint8_t colors[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
243 uint8_t bgs[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
244 uint8_t fonts[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
245 /*
246 * Bitmask of used rows; if a bit is not set, the
247 * corresponding row is not used.
248 * for setting row 1 use row | (1 << 0)
249 * for setting row 15 use row | (1 << 14)
250 */
251 int16_t row_used;
252 };
253
254 typedef struct CCaptionSubContext {
255 AVClass *class;
256 void *logctx;
257 int real_time;
258 int real_time_latency_msec;
259 int data_field;
260 struct Screen screen[2];
261 int active_screen;
262 uint8_t cursor_row;
263 uint8_t cursor_column;
264 uint8_t cursor_color;
265 uint8_t bg_color;
266 uint8_t cursor_font;
267 uint8_t cursor_charset;
268 AVBPrint buffer[2];
269 int buffer_index;
270 int buffer_changed;
271 int rollup;
272 enum cc_mode mode;
273 int64_t buffer_time[2];
274 int screen_touched;
275 int64_t last_real_time;
276 uint8_t prev_cmd[2];
277 int readorder;
278 } CCaptionSubContext;
279
280 14 static av_cold int init_decoder(AVCodecContext *avctx)
281 {
282 14 CCaptionSubContext *ctx = avctx->priv_data;
283
284 14 ctx->logctx = avctx;
285
286 14 av_bprint_init(&ctx->buffer[0], 0, AV_BPRINT_SIZE_UNLIMITED);
287 14 av_bprint_init(&ctx->buffer[1], 0, AV_BPRINT_SIZE_UNLIMITED);
288 /* taking by default roll up to 2 */
289 14 ctx->mode = CCMODE_ROLLUP;
290 14 ctx->bg_color = CCCOL_BLACK;
291 14 ctx->rollup = 2;
292 14 ctx->cursor_row = 10;
293 14 return ff_ass_subtitle_header(avctx, "Monospace",
294 ASS_DEFAULT_FONT_SIZE,
295 ASS_DEFAULT_COLOR,
296 ASS_DEFAULT_BACK_COLOR,
297 ASS_DEFAULT_BOLD,
298 ASS_DEFAULT_ITALIC,
299 ASS_DEFAULT_UNDERLINE,
300 3,
301 ASS_DEFAULT_ALIGNMENT);
302 }
303
304 14 static av_cold int close_decoder(AVCodecContext *avctx)
305 {
306 14 CCaptionSubContext *ctx = avctx->priv_data;
307 14 av_bprint_finalize(&ctx->buffer[0], NULL);
308 14 av_bprint_finalize(&ctx->buffer[1], NULL);
309 14 return 0;
310 }
311
312 ✗ static void flush_decoder(AVCodecContext *avctx)
313 {
314 ✗ CCaptionSubContext *ctx = avctx->priv_data;
315 ✗ ctx->screen[0].row_used = 0;
316 ✗ ctx->screen[1].row_used = 0;
317 ✗ ctx->prev_cmd[0] = 0;
318 ✗ ctx->prev_cmd[1] = 0;
319 ✗ ctx->mode = CCMODE_ROLLUP;
320 ✗ ctx->rollup = 2;
321 ✗ ctx->cursor_row = 10;
322 ✗ ctx->cursor_column = 0;
323 ✗ ctx->cursor_font = 0;
324 ✗ ctx->cursor_color = 0;
325 ✗ ctx->bg_color = CCCOL_BLACK;
326 ✗ ctx->cursor_charset = 0;
327 ✗ ctx->active_screen = 0;
328 ✗ ctx->last_real_time = 0;
329 ✗ ctx->screen_touched = 0;
330 ✗ ctx->buffer_changed = 0;
331 ✗ if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
332 ✗ ctx->readorder = 0;
333 ✗ av_bprint_clear(&ctx->buffer[0]);
334 ✗ av_bprint_clear(&ctx->buffer[1]);
335 ✗ }
336
337 /**
338 * @param ctx closed caption context just to print log
339 */
340 5999 static void write_char(CCaptionSubContext *ctx, struct Screen *screen, char ch)
341 {
342 5999 uint8_t col = ctx->cursor_column;
343 5999 char *row = screen->characters[ctx->cursor_row];
344 5999 char *font = screen->fonts[ctx->cursor_row];
345 5999 char *color = screen->colors[ctx->cursor_row];
346 5999 char *bg = screen->bgs[ctx->cursor_row];
347 5999 char *charset = screen->charsets[ctx->cursor_row];
348
349
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 5999 if (col < SCREEN_COLUMNS) {
350 5990 row[col] = ch;
351 5990 font[col] = ctx->cursor_font;
352 5990 color[col] = ctx->cursor_color;
353 5990 bg[col] = ctx->bg_color;
354 5990 charset[col] = ctx->cursor_charset;
355 5990 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
356
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 5990 if (ch) ctx->cursor_column++;
357 5990 return;
358 }
359 /* We have extra space at end only for null character */
360
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 9 else if (col == SCREEN_COLUMNS && ch == 0) {
361 9 row[col] = ch;
362 9 return;
363 }
364 else {
365 ✗ av_log(ctx->logctx, AV_LOG_WARNING, "Data ignored due to columns exceeding screen width\n");
366 ✗ return;
367 }
368 }
369
370 /**
371 * This function after validating parity bit, also remove it from data pair.
372 * The first byte doesn't pass parity, we replace it with a solid blank
373 * and process the pair.
374 * If the second byte doesn't pass parity, it returns INVALIDDATA
375 * user can ignore the whole pair and pass the other pair.
376 */
377 13817 static int validate_cc_data_pair(const uint8_t *cc_data_pair, uint8_t *hi)
378 {
379 13817 uint8_t cc_valid = (*cc_data_pair & 4) >>2;
380 13817 uint8_t cc_type = *cc_data_pair & 3;
381
382 13817 *hi = cc_data_pair[1];
383
384
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 13817 if (!cc_valid)
385 9308 return AVERROR_INVALIDDATA;
386
387 // if EIA-608 data then verify parity.
388
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 4509 if (cc_type==0 || cc_type==1) {
389
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 3953 if (!av_parity(cc_data_pair[2])) {
390 ✗ return AVERROR_INVALIDDATA;
391 }
392
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 3953 if (!av_parity(cc_data_pair[1])) {
393 ✗ *hi = 0x7F;
394 }
395 }
396
397 //Skip non-data
398
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 4509 if ((cc_data_pair[0] == 0xFA || cc_data_pair[0] == 0xFC || cc_data_pair[0] == 0xFD)
399
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 3545 && (cc_data_pair[1] & 0x7F) == 0 && (cc_data_pair[2] & 0x7F) == 0)
400 884 return AVERROR_PATCHWELCOME;
401
402 //skip 708 data
403
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 3625 if (cc_type == 3 || cc_type == 2)
404 556 return AVERROR_PATCHWELCOME;
405
406 3069 return 0;
407 }
408
409 1889 static struct Screen *get_writing_screen(CCaptionSubContext *ctx)
410 {
411
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 1889 switch (ctx->mode) {
412 1676 case CCMODE_POPON:
413 // use Inactive screen
414
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 1676 return ctx->screen + !ctx->active_screen;
415 213 case CCMODE_PAINTON:
416 case CCMODE_ROLLUP:
417 case CCMODE_TEXT:
418 // use active screen
419 213 return ctx->screen + ctx->active_screen;
420 }
421 /* It was never an option */
422 ✗ return NULL;
423 }
424
425 15 static void roll_up(CCaptionSubContext *ctx)
426 {
427 struct Screen *screen;
428 int i, keep_lines;
429
430
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 15 if (ctx->mode == CCMODE_TEXT)
431 ✗ return;
432
433 15 screen = get_writing_screen(ctx);
434
435 /* +1 signify cursor_row starts from 0
436 * Can't keep lines less then row cursor pos
437 */
438
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 15 keep_lines = FFMIN(ctx->cursor_row + 1, ctx->rollup);
439
440
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 240 for (i = 0; i < SCREEN_ROWS; i++) {
441
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 225 if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row)
442 30 continue;
443 195 UNSET_FLAG(screen->row_used, i);
444 }
445
446
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 37 for (i = 0; i < keep_lines && screen->row_used; i++) {
447 22 const int i_row = ctx->cursor_row - keep_lines + i + 1;
448
449 22 memcpy(screen->characters[i_row], screen->characters[i_row+1], SCREEN_COLUMNS);
450 22 memcpy(screen->colors[i_row], screen->colors[i_row+1], SCREEN_COLUMNS);
451 22 memcpy(screen->bgs[i_row], screen->bgs[i_row+1], SCREEN_COLUMNS);
452 22 memcpy(screen->fonts[i_row], screen->fonts[i_row+1], SCREEN_COLUMNS);
453 22 memcpy(screen->charsets[i_row], screen->charsets[i_row+1], SCREEN_COLUMNS);
454
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 22 if (CHECK_FLAG(screen->row_used, i_row + 1))
455 11 SET_FLAG(screen->row_used, i_row);
456 }
457
458 15 UNSET_FLAG(screen->row_used, ctx->cursor_row);
459 }
460
461 227 static int capture_screen(CCaptionSubContext *ctx)
462 {
463 227 int i, j, tab = 0;
464 227 struct Screen *screen = ctx->screen + ctx->active_screen;
465 227 enum cc_font prev_font = CCFONT_REGULAR;
466 227 enum cc_color_code prev_color = CCCOL_WHITE;
467 227 enum cc_color_code prev_bg_color = CCCOL_BLACK;
468 227 const int bidx = ctx->buffer_index;
469
470 227 av_bprint_clear(&ctx->buffer[bidx]);
471
472
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 2042 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
473 {
474
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 1815 if (CHECK_FLAG(screen->row_used, i)) {
475 232 const char *row = screen->characters[i];
476 232 const char *charset = screen->charsets[i];
477 232 j = 0;
478
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 1396 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN)
479 1164 j++;
480
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 232 if (!tab || j < tab)
481 180 tab = j;
482 }
483 }
484
485
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 2042 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
486 {
487
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 1815 if (CHECK_FLAG(screen->row_used, i)) {
488 232 const char *row = screen->characters[i];
489 232 const char *font = screen->fonts[i];
490 232 const char *bg = screen->bgs[i];
491 232 const char *color = screen->colors[i];
492 232 const char *charset = screen->charsets[i];
493 const char *override;
494 232 int x, y, seen_char = 0;
495 232 j = 0;
496
497 /* skip leading space */
498
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 1203 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN && j < tab)
499 971 j++;
500
501 232 x = ASS_DEFAULT_PLAYRESX * (0.1 + 0.0250 * j);
502 232 y = ASS_DEFAULT_PLAYRESY * (0.1 + 0.0533 * i);
503 232 av_bprintf(&ctx->buffer[bidx], "{\\an7}{\\pos(%d,%d)}", x, y);
504
505
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 4195 for (; j < SCREEN_COLUMNS; j++) {
506 4186 const char *e_tag = "", *s_tag = "", *c_tag = "", *b_tag = "";
507
508
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 4186 if (row[j] == 0)
509 223 break;
510
511
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 3963 if (prev_font != font[j]) {
512
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 64 switch (prev_font) {
513 20 case CCFONT_ITALICS:
514 20 e_tag = "{\\i0}";
515 20 break;
516 ✗ case CCFONT_UNDERLINED:
517 ✗ e_tag = "{\\u0}";
518 ✗ break;
519 ✗ case CCFONT_UNDERLINED_ITALICS:
520 ✗ e_tag = "{\\u0}{\\i0}";
521 ✗ break;
522 }
523
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 64 switch (font[j]) {
524 44 case CCFONT_ITALICS:
525 44 s_tag = "{\\i1}";
526 44 break;
527 ✗ case CCFONT_UNDERLINED:
528 ✗ s_tag = "{\\u1}";
529 ✗ break;
530 ✗ case CCFONT_UNDERLINED_ITALICS:
531 ✗ s_tag = "{\\u1}{\\i1}";
532 ✗ break;
533 }
534 }
535
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 3963 if (prev_color != color[j]) {
536 ✗ switch (color[j]) {
537 ✗ case CCCOL_WHITE:
538 ✗ c_tag = "{\\c&HFFFFFF&}";
539 ✗ break;
540 ✗ case CCCOL_GREEN:
541 ✗ c_tag = "{\\c&H00FF00&}";
542 ✗ break;
543 ✗ case CCCOL_BLUE:
544 ✗ c_tag = "{\\c&HFF0000&}";
545 ✗ break;
546 ✗ case CCCOL_CYAN:
547 ✗ c_tag = "{\\c&HFFFF00&}";
548 ✗ break;
549 ✗ case CCCOL_RED:
550 ✗ c_tag = "{\\c&H0000FF&}";
551 ✗ break;
552 ✗ case CCCOL_YELLOW:
553 ✗ c_tag = "{\\c&H00FFFF&}";
554 ✗ break;
555 ✗ case CCCOL_MAGENTA:
556 ✗ c_tag = "{\\c&HFF00FF&}";
557 ✗ break;
558 }
559 }
560
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 3963 if (prev_bg_color != bg[j]) {
561 ✗ switch (bg[j]) {
562 ✗ case CCCOL_WHITE:
563 ✗ b_tag = "{\\3c&HFFFFFF&}";
564 ✗ break;
565 ✗ case CCCOL_GREEN:
566 ✗ b_tag = "{\\3c&H00FF00&}";
567 ✗ break;
568 ✗ case CCCOL_BLUE:
569 ✗ b_tag = "{\\3c&HFF0000&}";
570 ✗ break;
571 ✗ case CCCOL_CYAN:
572 ✗ b_tag = "{\\3c&HFFFF00&}";
573 ✗ break;
574 ✗ case CCCOL_RED:
575 ✗ b_tag = "{\\3c&H0000FF&}";
576 ✗ break;
577 ✗ case CCCOL_YELLOW:
578 ✗ b_tag = "{\\3c&H00FFFF&}";
579 ✗ break;
580 ✗ case CCCOL_MAGENTA:
581 ✗ b_tag = "{\\3c&HFF00FF&}";
582 ✗ break;
583 ✗ case CCCOL_BLACK:
584 ✗ b_tag = "{\\3c&H000000&}";
585 ✗ break;
586 }
587 }
588
589 3963 prev_font = font[j];
590 3963 prev_color = color[j];
591 3963 prev_bg_color = bg[j];
592 3963 override = charset_overrides[(int)charset[j]][(int)row[j]];
593
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 3963 if (override[0]) {
594 11 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%s", e_tag, s_tag, c_tag, b_tag, override);
595 11 seen_char = 1;
596
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 3952 } else if (row[j] == ' ' && !seen_char) {
597 193 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s\\h", e_tag, s_tag, c_tag, b_tag);
598 } else {
599 3759 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%c", e_tag, s_tag, c_tag, b_tag, row[j]);
600 3759 seen_char = 1;
601 }
602
603 }
604 232 av_bprintf(&ctx->buffer[bidx], "\\N");
605 }
606 }
607
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 227 if (!av_bprint_is_complete(&ctx->buffer[bidx]))
608 ✗ return AVERROR(ENOMEM);
609
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 227 if (screen->row_used && ctx->buffer[bidx].len >= 2) {
610 121 ctx->buffer[bidx].len -= 2;
611 121 ctx->buffer[bidx].str[ctx->buffer[bidx].len] = 0;
612 }
613 227 ctx->buffer_changed = 1;
614 227 return 0;
615 }
616
617 203 static void update_time(CCaptionSubContext *ctx, int64_t pts)
618 {
619 203 ctx->buffer_time[0] = ctx->buffer_time[1];
620 203 ctx->buffer_time[1] = pts;
621 203 }
622
623 ✗ static void handle_bgattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
624 {
625 ✗ const int i = (lo & 0xf) >> 1;
626
627 ✗ ctx->bg_color = bg_attribs[i];
628 ✗ }
629
630 15 static void handle_textattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
631 {
632 15 int i = lo - 0x20;
633 15 struct Screen *screen = get_writing_screen(ctx);
634
635
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 15 if (i >= 32)
636 ✗ return;
637
638 15 ctx->cursor_color = pac2_attribs[i][0];
639 15 ctx->cursor_font = pac2_attribs[i][1];
640
641 15 SET_FLAG(screen->row_used, ctx->cursor_row);
642 15 write_char(ctx, screen, ' ');
643 }
644
645 203 static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
646 {
647 static const int8_t row_map[] = {
648 11, -1, 1, 2, 3, 4, 12, 13, 14, 15, 5, 6, 7, 8, 9, 10
649 };
650 203 const int index = ( (hi<<1) & 0x0e) | ( (lo>>5) & 0x01 );
651 203 struct Screen *screen = get_writing_screen(ctx);
652 int indent, i;
653
654
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 203 if (row_map[index] <= 0) {
655 ✗ av_log(ctx->logctx, AV_LOG_DEBUG, "Invalid pac index encountered\n");
656 ✗ return;
657 }
658
659 203 lo &= 0x1f;
660
661 203 ctx->cursor_row = row_map[index] - 1;
662 203 ctx->cursor_color = pac2_attribs[lo][0];
663 203 ctx->cursor_font = pac2_attribs[lo][1];
664 203 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
665 203 ctx->cursor_column = 0;
666 203 indent = pac2_attribs[lo][2];
667
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 1339 for (i = 0; i < indent; i++) {
668 1136 write_char(ctx, screen, ' ');
669 }
670 }
671
672 197 static int handle_edm(CCaptionSubContext *ctx)
673 {
674 197 struct Screen *screen = ctx->screen + ctx->active_screen;
675 int ret;
676
677 // In buffered mode, keep writing to screen until it is wiped.
678 // Before wiping the display, capture contents to emit subtitle.
679
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 197 if (!ctx->real_time)
680 197 ret = capture_screen(ctx);
681
682 197 screen->row_used = 0;
683 197 ctx->bg_color = CCCOL_BLACK;
684
685 // In realtime mode, emit an empty caption so the last one doesn't
686 // stay on the screen.
687
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 197 if (ctx->real_time)
688 ✗ ret = capture_screen(ctx);
689
690 197 return ret;
691 }
692
693 93 static int handle_eoc(CCaptionSubContext *ctx)
694 {
695 int ret;
696
697 93 ctx->active_screen = !ctx->active_screen;
698
699 // In buffered mode, we wait til the *next* EOC and
700 // capture what was already on the screen since the last EOC.
701
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 93 if (!ctx->real_time)
702 93 ret = handle_edm(ctx);
703
704 93 ctx->cursor_column = 0;
705
706 // In realtime mode, we display the buffered contents (after
707 // flipping the buffer to active above) as soon as EOC arrives.
708
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 93 if (ctx->real_time)
709 ✗ ret = capture_screen(ctx);
710
711 93 return ret;
712 }
713
714 ✗ static void handle_delete_end_of_row(CCaptionSubContext *ctx)
715 {
716 ✗ struct Screen *screen = get_writing_screen(ctx);
717 ✗ write_char(ctx, screen, 0);
718 ✗ }
719
720 1656 static void handle_char(CCaptionSubContext *ctx, char hi, char lo)
721 {
722 1656 struct Screen *screen = get_writing_screen(ctx);
723
724 1656 SET_FLAG(screen->row_used, ctx->cursor_row);
725
726
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 1656 switch (hi) {
727 ✗ case 0x11:
728 ✗ ctx->cursor_charset = CCSET_SPECIAL_AMERICAN;
729 ✗ break;
730 ✗ case 0x12:
731 ✗ if (ctx->cursor_column > 0)
732 ✗ ctx->cursor_column -= 1;
733 ✗ ctx->cursor_charset = CCSET_EXTENDED_SPANISH_FRENCH_MISC;
734 ✗ break;
735 ✗ case 0x13:
736 ✗ if (ctx->cursor_column > 0)
737 ✗ ctx->cursor_column -= 1;
738 ✗ ctx->cursor_charset = CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH;
739 ✗ break;
740 1656 default:
741 1656 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
742 1656 write_char(ctx, screen, hi);
743 1656 break;
744 }
745
746
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 1656 if (lo) {
747 1536 write_char(ctx, screen, lo);
748 }
749 1656 write_char(ctx, screen, 0);
750
751
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 1656 if (ctx->mode != CCMODE_POPON)
752 175 ctx->screen_touched = 1;
753
754 if (lo)
755 ff_dlog(ctx->logctx, "(%c,%c)\n", hi, lo);
756 else
757 ff_dlog(ctx->logctx, "(%c)\n", hi);
758 1656 }
759
760 2865 static int process_cc608(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
761 {
762 2865 int ret = 0;
763
764
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 2865 if (hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) {
765 672 return 0;
766 }
767
768 /* set prev command */
769 2193 ctx->prev_cmd[0] = hi;
770 2193 ctx->prev_cmd[1] = lo;
771
772
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 2193 if ( (hi == 0x10 && (lo >= 0x40 && lo <= 0x5f)) ||
773
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 2193 ( (hi >= 0x11 && hi <= 0x17) && (lo >= 0x40 && lo <= 0x7f) ) ) {
774 203 handle_pac(ctx, hi, lo);
775
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 1990 } else if ( ( hi == 0x11 && lo >= 0x20 && lo <= 0x2f ) ||
776 ✗ ( hi == 0x17 && lo >= 0x2e && lo <= 0x2f) ) {
777 15 handle_textattr(ctx, hi, lo);
778
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 1975 } else if ((hi == 0x10 && lo >= 0x20 && lo <= 0x2f)) {
779 ✗ handle_bgattr(ctx, hi, lo);
780
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 1975 } else if (hi == 0x14 || hi == 0x15 || hi == 0x1c) {
781
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 319 switch (lo) {
782 92 case 0x20:
783 /* resume caption loading */
784 92 ctx->mode = CCMODE_POPON;
785 92 break;
786 ✗ case 0x24:
787 ✗ handle_delete_end_of_row(ctx);
788 ✗ break;
789 15 case 0x25:
790 case 0x26:
791 case 0x27:
792 15 ctx->rollup = lo - 0x23;
793 15 ctx->mode = CCMODE_ROLLUP;
794 15 break;
795 ✗ case 0x29:
796 /* resume direct captioning */
797 ✗ ctx->mode = CCMODE_PAINTON;
798 ✗ break;
799 ✗ case 0x2b:
800 /* resume text display */
801 ✗ ctx->mode = CCMODE_TEXT;
802 ✗ break;
803 104 case 0x2c:
804 /* erase display memory */
805 104 handle_edm(ctx);
806 104 break;
807 15 case 0x2d:
808 /* carriage return */
809 ff_dlog(ctx->logctx, "carriage return\n");
810
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 15 if (!ctx->real_time)
811 6 ret = capture_screen(ctx);
812 15 roll_up(ctx);
813 15 ctx->cursor_column = 0;
814 15 break;
815 ✗ case 0x2e:
816 /* erase buffered (non displayed) memory */
817 // Only in realtime mode. In buffered mode, we re-use the inactive screen
818 // for our own buffering.
819 ✗ if (ctx->real_time) {
820 ✗ struct Screen *screen = ctx->screen + !ctx->active_screen;
821 ✗ screen->row_used = 0;
822 }
823 ✗ break;
824 93 case 0x2f:
825 /* end of caption */
826 ff_dlog(ctx->logctx, "handle_eoc\n");
827 93 ret = handle_eoc(ctx);
828 93 break;
829 ✗ default:
830 ff_dlog(ctx->logctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
831 ✗ break;
832 }
833
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 1656 } else if (hi >= 0x11 && hi <= 0x13) {
834 /* Special characters */
835 ✗ handle_char(ctx, hi, lo);
836
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 1656 } else if (hi >= 0x20) {
837 /* Standard characters (always in pairs) */
838 1656 handle_char(ctx, hi, lo);
839 1656 ctx->prev_cmd[0] = ctx->prev_cmd[1] = 0;
840 ✗ } else if (hi == 0x17 && lo >= 0x21 && lo <= 0x23) {
841 int i;
842 /* Tab offsets (spacing) */
843 ✗ for (i = 0; i < lo - 0x20; i++) {
844 ✗ handle_char(ctx, ' ', 0);
845 }
846 } else {
847 /* Ignoring all other non data code */
848 ff_dlog(ctx->logctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
849 }
850
851 2193 return ret;
852 }
853
854 852 static int decode(AVCodecContext *avctx, AVSubtitle *sub,
855 int *got_sub, const AVPacket *avpkt)
856 {
857 852 CCaptionSubContext *ctx = avctx->priv_data;
858 852 int64_t in_time = sub->pts;
859 int64_t start_time;
860 int64_t end_time;
861 852 int bidx = ctx->buffer_index;
862 852 const uint8_t *bptr = avpkt->data;
863 852 int len = avpkt->size;
864 852 int ret = 0;
865 int i;
866 852 unsigned nb_rect_allocated = 0;
867
868
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 14669 for (i = 0; i < len; i += 3) {
869 13817 uint8_t hi, cc_type = bptr[i] & 1;
870
871
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 13817 if (ctx->data_field < 0)
872 6 ctx->data_field = cc_type;
873
874
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 13817 if (validate_cc_data_pair(bptr + i, &hi))
875 13614 continue;
876
877
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 3069 if (cc_type != ctx->data_field)
878 204 continue;
879
880 2865 ret = process_cc608(ctx, hi & 0x7f, bptr[i + 2] & 0x7f);
881
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 2865 if (ret < 0)
882 ✗ return ret;
883
884
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 2865 if (!ctx->buffer_changed)
885 2662 continue;
886 203 ctx->buffer_changed = 0;
887
888
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 203 if (!ctx->real_time && ctx->mode == CCMODE_POPON)
889 197 ctx->buffer_index = bidx = !ctx->buffer_index;
890
891 203 update_time(ctx, in_time);
892
893
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 203 if (ctx->buffer[bidx].str[0] || ctx->real_time) {
894 ff_dlog(avctx, "cdp writing data (%s)\n", ctx->buffer[bidx].str);
895 97 start_time = ctx->buffer_time[0];
896 97 sub->pts = start_time;
897 97 end_time = ctx->buffer_time[1];
898
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 97 if (!ctx->real_time)
899 97 sub->end_display_time = av_rescale_q(end_time - start_time,
900 97 AV_TIME_BASE_Q, ms_tb);
901 else
902 ✗ sub->end_display_time = -1;
903 97 ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
904
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 97 if (ret < 0)
905 ✗ return ret;
906 97 ctx->last_real_time = sub->pts;
907 97 ctx->screen_touched = 0;
908 }
909 }
910
911
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 852 if (!bptr && !ctx->real_time && ctx->buffer[!ctx->buffer_index].str[0]) {
912 ✗ bidx = !ctx->buffer_index;
913 ✗ ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
914 ✗ if (ret < 0)
915 ✗ return ret;
916 ✗ av_bprint_clear(&ctx->buffer[bidx]);
917 ✗ sub->pts = ctx->buffer_time[1];
918 ✗ sub->end_display_time = av_rescale_q(ctx->buffer_time[1] - ctx->buffer_time[0],
919 ✗ AV_TIME_BASE_Q, ms_tb);
920 ✗ if (sub->end_display_time == 0)
921 ✗ sub->end_display_time = ctx->buffer[bidx].len * 20;
922 }
923
924
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 852 if (ctx->real_time && ctx->screen_touched &&
925
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 114 sub->pts >= ctx->last_real_time + av_rescale_q(ctx->real_time_latency_msec, ms_tb, AV_TIME_BASE_Q)) {
926 24 ctx->last_real_time = sub->pts;
927 24 ctx->screen_touched = 0;
928
929 24 capture_screen(ctx);
930 24 ctx->buffer_changed = 0;
931
932 24 ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
933
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 24 if (ret < 0)
934 ✗ return ret;
935 24 sub->end_display_time = -1;
936 }
937
938 852 *got_sub = sub->num_rects > 0;
939 852 return avpkt->size;
940 }
941
942 #define OFFSET(x) offsetof(CCaptionSubContext, x)
943 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
944 static const AVOption options[] = {
945 { "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 },
946 { "real_time_latency_msec", "minimum elapsed time between emitting real-time subtitle events", OFFSET(real_time_latency_msec), AV_OPT_TYPE_INT, { .i64 = 200 }, 0, 500, SD },
947 { "data_field", "select data field", OFFSET(data_field), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, SD, .unit = "data_field" },
948 { "auto", "pick first one that appears", 0, AV_OPT_TYPE_CONST, { .i64 =-1 }, 0, 0, SD, .unit = "data_field" },
949 { "first", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, SD, .unit = "data_field" },
950 { "second", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, SD, .unit = "data_field" },
951 {NULL}
952 };
953
954 static const AVClass ccaption_dec_class = {
955 .class_name = "Closed Captions Decoder",
956 .item_name = av_default_item_name,
957 .option = options,
958 .version = LIBAVUTIL_VERSION_INT,
959 };
960
961 const FFCodec ff_ccaption_decoder = {
962 .p.name = "cc_dec",
963 CODEC_LONG_NAME("Closed Captions (EIA-608 / CEA-708)"),
964 .p.type = AVMEDIA_TYPE_SUBTITLE,
965 .p.id = AV_CODEC_ID_EIA_608,
966 .p.priv_class = &ccaption_dec_class,
967 .p.capabilities = AV_CODEC_CAP_DELAY,
968 .priv_data_size = sizeof(CCaptionSubContext),
969 .init = init_decoder,
970 .close = close_decoder,
971 .flush = flush_decoder,
972 FF_CODEC_DECODE_SUB_CB(decode),
973 };
974