FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ccaption_dec.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 275 426 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 int real_time;
257 int real_time_latency_msec;
258 int data_field;
259 struct Screen screen[2];
260 int active_screen;
261 uint8_t cursor_row;
262 uint8_t cursor_column;
263 uint8_t cursor_color;
264 uint8_t bg_color;
265 uint8_t cursor_font;
266 uint8_t cursor_charset;
267 AVBPrint buffer[2];
268 int buffer_index;
269 int buffer_changed;
270 int rollup;
271 enum cc_mode mode;
272 int64_t buffer_time[2];
273 int screen_touched;
274 int64_t last_real_time;
275 uint8_t prev_cmd[2];
276 int readorder;
277 } CCaptionSubContext;
278
279 14 static av_cold int init_decoder(AVCodecContext *avctx)
280 {
281 14 CCaptionSubContext *ctx = avctx->priv_data;
282
283 14 av_bprint_init(&ctx->buffer[0], 0, AV_BPRINT_SIZE_UNLIMITED);
284 14 av_bprint_init(&ctx->buffer[1], 0, AV_BPRINT_SIZE_UNLIMITED);
285 /* taking by default roll up to 2 */
286 14 ctx->mode = CCMODE_ROLLUP;
287 14 ctx->bg_color = CCCOL_BLACK;
288 14 ctx->rollup = 2;
289 14 ctx->cursor_row = 10;
290 14 return ff_ass_subtitle_header(avctx, "Monospace",
291 ASS_DEFAULT_FONT_SIZE,
292 ASS_DEFAULT_COLOR,
293 ASS_DEFAULT_BACK_COLOR,
294 ASS_DEFAULT_BOLD,
295 ASS_DEFAULT_ITALIC,
296 ASS_DEFAULT_UNDERLINE,
297 3,
298 ASS_DEFAULT_ALIGNMENT);
299 }
300
301 14 static av_cold int close_decoder(AVCodecContext *avctx)
302 {
303 14 CCaptionSubContext *ctx = avctx->priv_data;
304 14 av_bprint_finalize(&ctx->buffer[0], NULL);
305 14 av_bprint_finalize(&ctx->buffer[1], NULL);
306 14 return 0;
307 }
308
309 ✗ static void flush_decoder(AVCodecContext *avctx)
310 {
311 ✗ CCaptionSubContext *ctx = avctx->priv_data;
312 ✗ ctx->screen[0].row_used = 0;
313 ✗ ctx->screen[1].row_used = 0;
314 ✗ ctx->prev_cmd[0] = 0;
315 ✗ ctx->prev_cmd[1] = 0;
316 ✗ ctx->mode = CCMODE_ROLLUP;
317 ✗ ctx->rollup = 2;
318 ✗ ctx->cursor_row = 10;
319 ✗ ctx->cursor_column = 0;
320 ✗ ctx->cursor_font = 0;
321 ✗ ctx->cursor_color = 0;
322 ✗ ctx->bg_color = CCCOL_BLACK;
323 ✗ ctx->cursor_charset = 0;
324 ✗ ctx->active_screen = 0;
325 ✗ ctx->last_real_time = 0;
326 ✗ ctx->screen_touched = 0;
327 ✗ ctx->buffer_changed = 0;
328 ✗ if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
329 ✗ ctx->readorder = 0;
330 ✗ av_bprint_clear(&ctx->buffer[0]);
331 ✗ av_bprint_clear(&ctx->buffer[1]);
332 ✗ }
333
334 /**
335 * @param ctx closed caption context just to print log
336 */
337 5999 static void write_char(CCaptionSubContext *ctx, struct Screen *screen, char ch)
338 {
339 5999 uint8_t col = ctx->cursor_column;
340 5999 char *row = screen->characters[ctx->cursor_row];
341 5999 char *font = screen->fonts[ctx->cursor_row];
342 5999 char *color = screen->colors[ctx->cursor_row];
343 5999 char *bg = screen->bgs[ctx->cursor_row];
344 5999 char *charset = screen->charsets[ctx->cursor_row];
345
346
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 5999 if (col < SCREEN_COLUMNS) {
347 5990 row[col] = ch;
348 5990 font[col] = ctx->cursor_font;
349 5990 color[col] = ctx->cursor_color;
350 5990 bg[col] = ctx->bg_color;
351 5990 charset[col] = ctx->cursor_charset;
352 5990 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
353
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 5990 if (ch) ctx->cursor_column++;
354 5990 return;
355 }
356 /* We have extra space at end only for null character */
357
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 9 else if (col == SCREEN_COLUMNS && ch == 0) {
358 9 row[col] = ch;
359 9 return;
360 }
361 else {
362 ✗ av_log(ctx, AV_LOG_WARNING, "Data ignored due to columns exceeding screen width\n");
363 ✗ return;
364 }
365 }
366
367 /**
368 * This function after validating parity bit, also remove it from data pair.
369 * The first byte doesn't pass parity, we replace it with a solid blank
370 * and process the pair.
371 * If the second byte doesn't pass parity, it returns INVALIDDATA
372 * user can ignore the whole pair and pass the other pair.
373 */
374 13817 static int validate_cc_data_pair(const uint8_t *cc_data_pair, uint8_t *hi)
375 {
376 13817 uint8_t cc_valid = (*cc_data_pair & 4) >>2;
377 13817 uint8_t cc_type = *cc_data_pair & 3;
378
379 13817 *hi = cc_data_pair[1];
380
381
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 13817 if (!cc_valid)
382 9312 return AVERROR_INVALIDDATA;
383
384 // if EIA-608 data then verify parity.
385
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 4505 if (cc_type==0 || cc_type==1) {
386
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 3949 if (!av_parity(cc_data_pair[2])) {
387 ✗ return AVERROR_INVALIDDATA;
388 }
389
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 3949 if (!av_parity(cc_data_pair[1])) {
390 ✗ *hi = 0x7F;
391 }
392 }
393
394 //Skip non-data
395
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 4505 if ((cc_data_pair[0] == 0xFA || cc_data_pair[0] == 0xFC || cc_data_pair[0] == 0xFD)
396
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 3545 && (cc_data_pair[1] & 0x7F) == 0 && (cc_data_pair[2] & 0x7F) == 0)
397 884 return AVERROR_PATCHWELCOME;
398
399 //skip 708 data
400
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 3621 if (cc_type == 3 || cc_type == 2)
401 556 return AVERROR_PATCHWELCOME;
402
403 3065 return 0;
404 }
405
406 1889 static struct Screen *get_writing_screen(CCaptionSubContext *ctx)
407 {
408
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 1889 switch (ctx->mode) {
409 1676 case CCMODE_POPON:
410 // use Inactive screen
411
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 1676 return ctx->screen + !ctx->active_screen;
412 213 case CCMODE_PAINTON:
413 case CCMODE_ROLLUP:
414 case CCMODE_TEXT:
415 // use active screen
416 213 return ctx->screen + ctx->active_screen;
417 }
418 /* It was never an option */
419 ✗ return NULL;
420 }
421
422 15 static void roll_up(CCaptionSubContext *ctx)
423 {
424 struct Screen *screen;
425 int i, keep_lines;
426
427
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 15 if (ctx->mode == CCMODE_TEXT)
428 ✗ return;
429
430 15 screen = get_writing_screen(ctx);
431
432 /* +1 signify cursor_row starts from 0
433 * Can't keep lines less then row cursor pos
434 */
435
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 15 keep_lines = FFMIN(ctx->cursor_row + 1, ctx->rollup);
436
437
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 240 for (i = 0; i < SCREEN_ROWS; i++) {
438
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 225 if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row)
439 30 continue;
440 195 UNSET_FLAG(screen->row_used, i);
441 }
442
443
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 37 for (i = 0; i < keep_lines && screen->row_used; i++) {
444 22 const int i_row = ctx->cursor_row - keep_lines + i + 1;
445
446 22 memcpy(screen->characters[i_row], screen->characters[i_row+1], SCREEN_COLUMNS);
447 22 memcpy(screen->colors[i_row], screen->colors[i_row+1], SCREEN_COLUMNS);
448 22 memcpy(screen->bgs[i_row], screen->bgs[i_row+1], SCREEN_COLUMNS);
449 22 memcpy(screen->fonts[i_row], screen->fonts[i_row+1], SCREEN_COLUMNS);
450 22 memcpy(screen->charsets[i_row], screen->charsets[i_row+1], SCREEN_COLUMNS);
451
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 22 if (CHECK_FLAG(screen->row_used, i_row + 1))
452 11 SET_FLAG(screen->row_used, i_row);
453 }
454
455 15 UNSET_FLAG(screen->row_used, ctx->cursor_row);
456 }
457
458 227 static int capture_screen(CCaptionSubContext *ctx)
459 {
460 227 int i, j, tab = 0;
461 227 struct Screen *screen = ctx->screen + ctx->active_screen;
462 227 enum cc_font prev_font = CCFONT_REGULAR;
463 227 enum cc_color_code prev_color = CCCOL_WHITE;
464 227 enum cc_color_code prev_bg_color = CCCOL_BLACK;
465 227 const int bidx = ctx->buffer_index;
466
467 227 av_bprint_clear(&ctx->buffer[bidx]);
468
469
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 2042 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
470 {
471
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 1815 if (CHECK_FLAG(screen->row_used, i)) {
472 232 const char *row = screen->characters[i];
473 232 const char *charset = screen->charsets[i];
474 232 j = 0;
475
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 1396 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN)
476 1164 j++;
477
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 232 if (!tab || j < tab)
478 180 tab = j;
479 }
480 }
481
482
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 2042 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
483 {
484
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 1815 if (CHECK_FLAG(screen->row_used, i)) {
485 232 const char *row = screen->characters[i];
486 232 const char *font = screen->fonts[i];
487 232 const char *bg = screen->bgs[i];
488 232 const char *color = screen->colors[i];
489 232 const char *charset = screen->charsets[i];
490 const char *override;
491 232 int x, y, seen_char = 0;
492 232 j = 0;
493
494 /* skip leading space */
495
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 1203 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN && j < tab)
496 971 j++;
497
498 232 x = ASS_DEFAULT_PLAYRESX * (0.1 + 0.0250 * j);
499 232 y = ASS_DEFAULT_PLAYRESY * (0.1 + 0.0533 * i);
500 232 av_bprintf(&ctx->buffer[bidx], "{\\an7}{\\pos(%d,%d)}", x, y);
501
502
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 4195 for (; j < SCREEN_COLUMNS; j++) {
503 4186 const char *e_tag = "", *s_tag = "", *c_tag = "", *b_tag = "";
504
505
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 4186 if (row[j] == 0)
506 223 break;
507
508
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 3963 if (prev_font != font[j]) {
509
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 64 switch (prev_font) {
510 20 case CCFONT_ITALICS:
511 20 e_tag = "{\\i0}";
512 20 break;
513 ✗ case CCFONT_UNDERLINED:
514 ✗ e_tag = "{\\u0}";
515 ✗ break;
516 ✗ case CCFONT_UNDERLINED_ITALICS:
517 ✗ e_tag = "{\\u0}{\\i0}";
518 ✗ break;
519 }
520
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 64 switch (font[j]) {
521 44 case CCFONT_ITALICS:
522 44 s_tag = "{\\i1}";
523 44 break;
524 ✗ case CCFONT_UNDERLINED:
525 ✗ s_tag = "{\\u1}";
526 ✗ break;
527 ✗ case CCFONT_UNDERLINED_ITALICS:
528 ✗ s_tag = "{\\u1}{\\i1}";
529 ✗ break;
530 }
531 }
532
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 3963 if (prev_color != color[j]) {
533 ✗ switch (color[j]) {
534 ✗ case CCCOL_WHITE:
535 ✗ c_tag = "{\\c&HFFFFFF&}";
536 ✗ break;
537 ✗ case CCCOL_GREEN:
538 ✗ c_tag = "{\\c&H00FF00&}";
539 ✗ break;
540 ✗ case CCCOL_BLUE:
541 ✗ c_tag = "{\\c&HFF0000&}";
542 ✗ break;
543 ✗ case CCCOL_CYAN:
544 ✗ c_tag = "{\\c&HFFFF00&}";
545 ✗ break;
546 ✗ case CCCOL_RED:
547 ✗ c_tag = "{\\c&H0000FF&}";
548 ✗ break;
549 ✗ case CCCOL_YELLOW:
550 ✗ c_tag = "{\\c&H00FFFF&}";
551 ✗ break;
552 ✗ case CCCOL_MAGENTA:
553 ✗ c_tag = "{\\c&HFF00FF&}";
554 ✗ break;
555 }
556 }
557
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 3963 if (prev_bg_color != bg[j]) {
558 ✗ switch (bg[j]) {
559 ✗ case CCCOL_WHITE:
560 ✗ b_tag = "{\\3c&HFFFFFF&}";
561 ✗ break;
562 ✗ case CCCOL_GREEN:
563 ✗ b_tag = "{\\3c&H00FF00&}";
564 ✗ break;
565 ✗ case CCCOL_BLUE:
566 ✗ b_tag = "{\\3c&HFF0000&}";
567 ✗ break;
568 ✗ case CCCOL_CYAN:
569 ✗ b_tag = "{\\3c&HFFFF00&}";
570 ✗ break;
571 ✗ case CCCOL_RED:
572 ✗ b_tag = "{\\3c&H0000FF&}";
573 ✗ break;
574 ✗ case CCCOL_YELLOW:
575 ✗ b_tag = "{\\3c&H00FFFF&}";
576 ✗ break;
577 ✗ case CCCOL_MAGENTA:
578 ✗ b_tag = "{\\3c&HFF00FF&}";
579 ✗ break;
580 ✗ case CCCOL_BLACK:
581 ✗ b_tag = "{\\3c&H000000&}";
582 ✗ break;
583 }
584 }
585
586 3963 prev_font = font[j];
587 3963 prev_color = color[j];
588 3963 prev_bg_color = bg[j];
589 3963 override = charset_overrides[(int)charset[j]][(int)row[j]];
590
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 3963 if (override[0]) {
591 11 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%s", e_tag, s_tag, c_tag, b_tag, override);
592 11 seen_char = 1;
593
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 3952 } else if (row[j] == ' ' && !seen_char) {
594 193 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s\\h", e_tag, s_tag, c_tag, b_tag);
595 } else {
596 3759 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%c", e_tag, s_tag, c_tag, b_tag, row[j]);
597 3759 seen_char = 1;
598 }
599
600 }
601 232 av_bprintf(&ctx->buffer[bidx], "\\N");
602 }
603 }
604
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 227 if (!av_bprint_is_complete(&ctx->buffer[bidx]))
605 ✗ return AVERROR(ENOMEM);
606
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 227 if (screen->row_used && ctx->buffer[bidx].len >= 2) {
607 121 ctx->buffer[bidx].len -= 2;
608 121 ctx->buffer[bidx].str[ctx->buffer[bidx].len] = 0;
609 }
610 227 ctx->buffer_changed = 1;
611 227 return 0;
612 }
613
614 203 static void update_time(CCaptionSubContext *ctx, int64_t pts)
615 {
616 203 ctx->buffer_time[0] = ctx->buffer_time[1];
617 203 ctx->buffer_time[1] = pts;
618 203 }
619
620 ✗ static void handle_bgattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
621 {
622 ✗ const int i = (lo & 0xf) >> 1;
623
624 ✗ ctx->bg_color = bg_attribs[i];
625 ✗ }
626
627 15 static void handle_textattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
628 {
629 15 int i = lo - 0x20;
630 15 struct Screen *screen = get_writing_screen(ctx);
631
632
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 15 if (i >= 32)
633 ✗ return;
634
635 15 ctx->cursor_color = pac2_attribs[i][0];
636 15 ctx->cursor_font = pac2_attribs[i][1];
637
638 15 SET_FLAG(screen->row_used, ctx->cursor_row);
639 15 write_char(ctx, screen, ' ');
640 }
641
642 203 static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
643 {
644 static const int8_t row_map[] = {
645 11, -1, 1, 2, 3, 4, 12, 13, 14, 15, 5, 6, 7, 8, 9, 10
646 };
647 203 const int index = ( (hi<<1) & 0x0e) | ( (lo>>5) & 0x01 );
648 203 struct Screen *screen = get_writing_screen(ctx);
649 int indent, i;
650
651
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 203 if (row_map[index] <= 0) {
652 ✗ av_log(ctx, AV_LOG_DEBUG, "Invalid pac index encountered\n");
653 ✗ return;
654 }
655
656 203 lo &= 0x1f;
657
658 203 ctx->cursor_row = row_map[index] - 1;
659 203 ctx->cursor_color = pac2_attribs[lo][0];
660 203 ctx->cursor_font = pac2_attribs[lo][1];
661 203 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
662 203 ctx->cursor_column = 0;
663 203 indent = pac2_attribs[lo][2];
664
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 1339 for (i = 0; i < indent; i++) {
665 1136 write_char(ctx, screen, ' ');
666 }
667 }
668
669 197 static int handle_edm(CCaptionSubContext *ctx)
670 {
671 197 struct Screen *screen = ctx->screen + ctx->active_screen;
672 int ret;
673
674 // In buffered mode, keep writing to screen until it is wiped.
675 // Before wiping the display, capture contents to emit subtitle.
676
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 197 if (!ctx->real_time)
677 197 ret = capture_screen(ctx);
678
679 197 screen->row_used = 0;
680 197 ctx->bg_color = CCCOL_BLACK;
681
682 // In realtime mode, emit an empty caption so the last one doesn't
683 // stay on the screen.
684
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 197 if (ctx->real_time)
685 ✗ ret = capture_screen(ctx);
686
687 197 return ret;
688 }
689
690 93 static int handle_eoc(CCaptionSubContext *ctx)
691 {
692 int ret;
693
694 93 ctx->active_screen = !ctx->active_screen;
695
696 // In buffered mode, we wait til the *next* EOC and
697 // capture what was already on the screen since the last EOC.
698
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 93 if (!ctx->real_time)
699 93 ret = handle_edm(ctx);
700
701 93 ctx->cursor_column = 0;
702
703 // In realtime mode, we display the buffered contents (after
704 // flipping the buffer to active above) as soon as EOC arrives.
705
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 93 if (ctx->real_time)
706 ✗ ret = capture_screen(ctx);
707
708 93 return ret;
709 }
710
711 ✗ static void handle_delete_end_of_row(CCaptionSubContext *ctx)
712 {
713 ✗ struct Screen *screen = get_writing_screen(ctx);
714 ✗ write_char(ctx, screen, 0);
715 ✗ }
716
717 1656 static void handle_char(CCaptionSubContext *ctx, char hi, char lo)
718 {
719 1656 struct Screen *screen = get_writing_screen(ctx);
720
721 1656 SET_FLAG(screen->row_used, ctx->cursor_row);
722
723
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 1656 switch (hi) {
724 ✗ case 0x11:
725 ✗ ctx->cursor_charset = CCSET_SPECIAL_AMERICAN;
726 ✗ break;
727 ✗ case 0x12:
728 ✗ if (ctx->cursor_column > 0)
729 ✗ ctx->cursor_column -= 1;
730 ✗ ctx->cursor_charset = CCSET_EXTENDED_SPANISH_FRENCH_MISC;
731 ✗ break;
732 ✗ case 0x13:
733 ✗ if (ctx->cursor_column > 0)
734 ✗ ctx->cursor_column -= 1;
735 ✗ ctx->cursor_charset = CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH;
736 ✗ break;
737 1656 default:
738 1656 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
739 1656 write_char(ctx, screen, hi);
740 1656 break;
741 }
742
743
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 1656 if (lo) {
744 1536 write_char(ctx, screen, lo);
745 }
746 1656 write_char(ctx, screen, 0);
747
748
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 1656 if (ctx->mode != CCMODE_POPON)
749 175 ctx->screen_touched = 1;
750
751 if (lo)
752 ff_dlog(ctx, "(%c,%c)\n", hi, lo);
753 else
754 ff_dlog(ctx, "(%c)\n", hi);
755 1656 }
756
757 2863 static int process_cc608(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
758 {
759 2863 int ret = 0;
760
761
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 2863 if (hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) {
762 670 return 0;
763 }
764
765 /* set prev command */
766 2193 ctx->prev_cmd[0] = hi;
767 2193 ctx->prev_cmd[1] = lo;
768
769
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 2193 if ( (hi == 0x10 && (lo >= 0x40 && lo <= 0x5f)) ||
770
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 2193 ( (hi >= 0x11 && hi <= 0x17) && (lo >= 0x40 && lo <= 0x7f) ) ) {
771 203 handle_pac(ctx, hi, lo);
772
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 1990 } else if ( ( hi == 0x11 && lo >= 0x20 && lo <= 0x2f ) ||
773 ✗ ( hi == 0x17 && lo >= 0x2e && lo <= 0x2f) ) {
774 15 handle_textattr(ctx, hi, lo);
775
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 1975 } else if ((hi == 0x10 && lo >= 0x20 && lo <= 0x2f)) {
776 ✗ handle_bgattr(ctx, hi, lo);
777
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 1975 } else if (hi == 0x14 || hi == 0x15 || hi == 0x1c) {
778
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 319 switch (lo) {
779 92 case 0x20:
780 /* resume caption loading */
781 92 ctx->mode = CCMODE_POPON;
782 92 break;
783 ✗ case 0x24:
784 ✗ handle_delete_end_of_row(ctx);
785 ✗ break;
786 15 case 0x25:
787 case 0x26:
788 case 0x27:
789 15 ctx->rollup = lo - 0x23;
790 15 ctx->mode = CCMODE_ROLLUP;
791 15 break;
792 ✗ case 0x29:
793 /* resume direct captioning */
794 ✗ ctx->mode = CCMODE_PAINTON;
795 ✗ break;
796 ✗ case 0x2b:
797 /* resume text display */
798 ✗ ctx->mode = CCMODE_TEXT;
799 ✗ break;
800 104 case 0x2c:
801 /* erase display memory */
802 104 handle_edm(ctx);
803 104 break;
804 15 case 0x2d:
805 /* carriage return */
806 ff_dlog(ctx, "carriage return\n");
807
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 15 if (!ctx->real_time)
808 6 ret = capture_screen(ctx);
809 15 roll_up(ctx);
810 15 ctx->cursor_column = 0;
811 15 break;
812 ✗ case 0x2e:
813 /* erase buffered (non displayed) memory */
814 // Only in realtime mode. In buffered mode, we re-use the inactive screen
815 // for our own buffering.
816 ✗ if (ctx->real_time) {
817 ✗ struct Screen *screen = ctx->screen + !ctx->active_screen;
818 ✗ screen->row_used = 0;
819 }
820 ✗ break;
821 93 case 0x2f:
822 /* end of caption */
823 ff_dlog(ctx, "handle_eoc\n");
824 93 ret = handle_eoc(ctx);
825 93 break;
826 ✗ default:
827 ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
828 ✗ break;
829 }
830
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 1656 } else if (hi >= 0x11 && hi <= 0x13) {
831 /* Special characters */
832 ✗ handle_char(ctx, hi, lo);
833
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 1656 } else if (hi >= 0x20) {
834 /* Standard characters (always in pairs) */
835 1656 handle_char(ctx, hi, lo);
836 1656 ctx->prev_cmd[0] = ctx->prev_cmd[1] = 0;
837 ✗ } else if (hi == 0x17 && lo >= 0x21 && lo <= 0x23) {
838 int i;
839 /* Tab offsets (spacing) */
840 ✗ for (i = 0; i < lo - 0x20; i++) {
841 ✗ handle_char(ctx, ' ', 0);
842 }
843 } else {
844 /* Ignoring all other non data code */
845 ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
846 }
847
848 2193 return ret;
849 }
850
851 852 static int decode(AVCodecContext *avctx, AVSubtitle *sub,
852 int *got_sub, const AVPacket *avpkt)
853 {
854 852 CCaptionSubContext *ctx = avctx->priv_data;
855 852 int64_t in_time = sub->pts;
856 int64_t start_time;
857 int64_t end_time;
858 852 int bidx = ctx->buffer_index;
859 852 const uint8_t *bptr = avpkt->data;
860 852 int len = avpkt->size;
861 852 int ret = 0;
862 int i;
863 852 unsigned nb_rect_allocated = 0;
864
865
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 14669 for (i = 0; i < len; i += 3) {
866 13817 uint8_t hi, cc_type = bptr[i] & 1;
867
868
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 13817 if (ctx->data_field < 0)
869 6 ctx->data_field = cc_type;
870
871
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 13817 if (validate_cc_data_pair(bptr + i, &hi))
872 13614 continue;
873
874
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 3065 if (cc_type != ctx->data_field)
875 202 continue;
876
877 2863 ret = process_cc608(ctx, hi & 0x7f, bptr[i + 2] & 0x7f);
878
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 2863 if (ret < 0)
879 ✗ return ret;
880
881
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 2863 if (!ctx->buffer_changed)
882 2660 continue;
883 203 ctx->buffer_changed = 0;
884
885
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 203 if (!ctx->real_time && ctx->mode == CCMODE_POPON)
886 197 ctx->buffer_index = bidx = !ctx->buffer_index;
887
888 203 update_time(ctx, in_time);
889
890
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 203 if (ctx->buffer[bidx].str[0] || ctx->real_time) {
891 ff_dlog(ctx, "cdp writing data (%s)\n", ctx->buffer[bidx].str);
892 97 start_time = ctx->buffer_time[0];
893 97 sub->pts = start_time;
894 97 end_time = ctx->buffer_time[1];
895
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 97 if (!ctx->real_time)
896 97 sub->end_display_time = av_rescale_q(end_time - start_time,
897 97 AV_TIME_BASE_Q, ms_tb);
898 else
899 ✗ sub->end_display_time = -1;
900 97 ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
901
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 97 if (ret < 0)
902 ✗ return ret;
903 97 ctx->last_real_time = sub->pts;
904 97 ctx->screen_touched = 0;
905 }
906 }
907
908
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 852 if (!bptr && !ctx->real_time && ctx->buffer[!ctx->buffer_index].str[0]) {
909 ✗ bidx = !ctx->buffer_index;
910 ✗ ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
911 ✗ if (ret < 0)
912 ✗ return ret;
913 ✗ av_bprint_clear(&ctx->buffer[bidx]);
914 ✗ sub->pts = ctx->buffer_time[1];
915 ✗ sub->end_display_time = av_rescale_q(ctx->buffer_time[1] - ctx->buffer_time[0],
916 ✗ AV_TIME_BASE_Q, ms_tb);
917 ✗ if (sub->end_display_time == 0)
918 ✗ sub->end_display_time = ctx->buffer[bidx].len * 20;
919 }
920
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 852 if (ctx->real_time && ctx->screen_touched &&
922
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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)) {
923 24 ctx->last_real_time = sub->pts;
924 24 ctx->screen_touched = 0;
925
926 24 capture_screen(ctx);
927 24 ctx->buffer_changed = 0;
928
929 24 ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
930
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 24 if (ret < 0)
931 ✗ return ret;
932 24 sub->end_display_time = -1;
933 }
934
935 852 *got_sub = sub->num_rects > 0;
936 852 return avpkt->size;
937 }
938
939 #define OFFSET(x) offsetof(CCaptionSubContext, x)
940 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
941 static const AVOption options[] = {
942 { "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 },
943 { "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 },
944 { "data_field", "select data field", OFFSET(data_field), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, SD, .unit = "data_field" },
945 { "auto", "pick first one that appears", 0, AV_OPT_TYPE_CONST, { .i64 =-1 }, 0, 0, SD, .unit = "data_field" },
946 { "first", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, SD, .unit = "data_field" },
947 { "second", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, SD, .unit = "data_field" },
948 {NULL}
949 };
950
951 static const AVClass ccaption_dec_class = {
952 .class_name = "Closed Captions Decoder",
953 .item_name = av_default_item_name,
954 .option = options,
955 .version = LIBAVUTIL_VERSION_INT,
956 };
957
958 const FFCodec ff_ccaption_decoder = {
959 .p.name = "cc_dec",
960 CODEC_LONG_NAME("Closed Captions (EIA-608 / CEA-708)"),
961 .p.type = AVMEDIA_TYPE_SUBTITLE,
962 .p.id = AV_CODEC_ID_EIA_608,
963 .p.priv_class = &ccaption_dec_class,
964 .p.capabilities = AV_CODEC_CAP_DELAY,
965 .priv_data_size = sizeof(CCaptionSubContext),
966 .init = init_decoder,
967 .close = close_decoder,
968 .flush = flush_decoder,
969 FF_CODEC_DECODE_SUB_CB(decode),
970 };
971