FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/ccaption_dec.c
Date: 2024-02-16 17:37:06
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 "avcodec.h"
23 #include "ass.h"
24 #include "codec_internal.h"
25 #include "libavutil/opt.h"
26
27 #define SCREEN_ROWS 15
28 #define SCREEN_COLUMNS 32
29
30 #define SET_FLAG(var, val) ( (var) |= ( 1 << (val)) )
31 #define UNSET_FLAG(var, val) ( (var) &= ~( 1 << (val)) )
32 #define CHECK_FLAG(var, val) ( (var) & ( 1 << (val)) )
33
34 static const AVRational ms_tb = {1, 1000};
35
36 enum cc_mode {
37 CCMODE_POPON,
38 CCMODE_PAINTON,
39 CCMODE_ROLLUP,
40 CCMODE_TEXT,
41 };
42
43 enum cc_color_code {
44 CCCOL_WHITE,
45 CCCOL_GREEN,
46 CCCOL_BLUE,
47 CCCOL_CYAN,
48 CCCOL_RED,
49 CCCOL_YELLOW,
50 CCCOL_MAGENTA,
51 CCCOL_USERDEFINED,
52 CCCOL_BLACK,
53 CCCOL_TRANSPARENT,
54 };
55
56 enum cc_font {
57 CCFONT_REGULAR,
58 CCFONT_ITALICS,
59 CCFONT_UNDERLINED,
60 CCFONT_UNDERLINED_ITALICS,
61 };
62
63 enum cc_charset {
64 CCSET_BASIC_AMERICAN,
65 CCSET_SPECIAL_AMERICAN,
66 CCSET_EXTENDED_SPANISH_FRENCH_MISC,
67 CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH,
68 };
69
70 static const char *charset_overrides[4][128] =
71 {
72 [CCSET_BASIC_AMERICAN] = {
73 [0x27] = "\u2019",
74 [0x2a] = "\u00e1",
75 [0x5c] = "\u00e9",
76 [0x5e] = "\u00ed",
77 [0x5f] = "\u00f3",
78 [0x60] = "\u00fa",
79 [0x7b] = "\u00e7",
80 [0x7c] = "\u00f7",
81 [0x7d] = "\u00d1",
82 [0x7e] = "\u00f1",
83 [0x7f] = "\u2588"
84 },
85 [CCSET_SPECIAL_AMERICAN] = {
86 [0x30] = "\u00ae",
87 [0x31] = "\u00b0",
88 [0x32] = "\u00bd",
89 [0x33] = "\u00bf",
90 [0x34] = "\u2122",
91 [0x35] = "\u00a2",
92 [0x36] = "\u00a3",
93 [0x37] = "\u266a",
94 [0x38] = "\u00e0",
95 [0x39] = "\u00A0",
96 [0x3a] = "\u00e8",
97 [0x3b] = "\u00e2",
98 [0x3c] = "\u00ea",
99 [0x3d] = "\u00ee",
100 [0x3e] = "\u00f4",
101 [0x3f] = "\u00fb",
102 },
103 [CCSET_EXTENDED_SPANISH_FRENCH_MISC] = {
104 [0x20] = "\u00c1",
105 [0x21] = "\u00c9",
106 [0x22] = "\u00d3",
107 [0x23] = "\u00da",
108 [0x24] = "\u00dc",
109 [0x25] = "\u00fc",
110 [0x26] = "\u00b4",
111 [0x27] = "\u00a1",
112 [0x28] = "*",
113 [0x29] = "\u2018",
114 [0x2a] = "-",
115 [0x2b] = "\u00a9",
116 [0x2c] = "\u2120",
117 [0x2d] = "\u00b7",
118 [0x2e] = "\u201c",
119 [0x2f] = "\u201d",
120 [0x30] = "\u00c0",
121 [0x31] = "\u00c2",
122 [0x32] = "\u00c7",
123 [0x33] = "\u00c8",
124 [0x34] = "\u00ca",
125 [0x35] = "\u00cb",
126 [0x36] = "\u00eb",
127 [0x37] = "\u00ce",
128 [0x38] = "\u00cf",
129 [0x39] = "\u00ef",
130 [0x3a] = "\u00d4",
131 [0x3b] = "\u00d9",
132 [0x3c] = "\u00f9",
133 [0x3d] = "\u00db",
134 [0x3e] = "\u00ab",
135 [0x3f] = "\u00bb",
136 },
137 [CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH] = {
138 [0x20] = "\u00c3",
139 [0x21] = "\u00e3",
140 [0x22] = "\u00cd",
141 [0x23] = "\u00cc",
142 [0x24] = "\u00ec",
143 [0x25] = "\u00d2",
144 [0x26] = "\u00f2",
145 [0x27] = "\u00d5",
146 [0x28] = "\u00f5",
147 [0x29] = "{",
148 [0x2a] = "}",
149 [0x2b] = "\\",
150 [0x2c] = "^",
151 [0x2d] = "_",
152 [0x2e] = "|",
153 [0x2f] = "~",
154 [0x30] = "\u00c4",
155 [0x31] = "\u00e4",
156 [0x32] = "\u00d6",
157 [0x33] = "\u00f6",
158 [0x34] = "\u00df",
159 [0x35] = "\u00a5",
160 [0x36] = "\u00a4",
161 [0x37] = "\u00a6",
162 [0x38] = "\u00c5",
163 [0x39] = "\u00e5",
164 [0x3a] = "\u00d8",
165 [0x3b] = "\u00f8",
166 [0x3c] = "\u250c",
167 [0x3d] = "\u2510",
168 [0x3e] = "\u2514",
169 [0x3f] = "\u2518",
170 },
171 };
172
173 static const unsigned char bg_attribs[8] = // Color
174 {
175 CCCOL_WHITE,
176 CCCOL_GREEN,
177 CCCOL_BLUE,
178 CCCOL_CYAN,
179 CCCOL_RED,
180 CCCOL_YELLOW,
181 CCCOL_MAGENTA,
182 CCCOL_BLACK,
183 };
184
185 static const unsigned char pac2_attribs[32][3] = // Color, font, ident
186 {
187 { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x40 || 0x60
188 { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x41 || 0x61
189 { CCCOL_GREEN, CCFONT_REGULAR, 0 }, // 0x42 || 0x62
190 { CCCOL_GREEN, CCFONT_UNDERLINED, 0 }, // 0x43 || 0x63
191 { CCCOL_BLUE, CCFONT_REGULAR, 0 }, // 0x44 || 0x64
192 { CCCOL_BLUE, CCFONT_UNDERLINED, 0 }, // 0x45 || 0x65
193 { CCCOL_CYAN, CCFONT_REGULAR, 0 }, // 0x46 || 0x66
194 { CCCOL_CYAN, CCFONT_UNDERLINED, 0 }, // 0x47 || 0x67
195 { CCCOL_RED, CCFONT_REGULAR, 0 }, // 0x48 || 0x68
196 { CCCOL_RED, CCFONT_UNDERLINED, 0 }, // 0x49 || 0x69
197 { CCCOL_YELLOW, CCFONT_REGULAR, 0 }, // 0x4a || 0x6a
198 { CCCOL_YELLOW, CCFONT_UNDERLINED, 0 }, // 0x4b || 0x6b
199 { CCCOL_MAGENTA, CCFONT_REGULAR, 0 }, // 0x4c || 0x6c
200 { CCCOL_MAGENTA, CCFONT_UNDERLINED, 0 }, // 0x4d || 0x6d
201 { CCCOL_WHITE, CCFONT_ITALICS, 0 }, // 0x4e || 0x6e
202 { CCCOL_WHITE, CCFONT_UNDERLINED_ITALICS, 0 }, // 0x4f || 0x6f
203 { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x50 || 0x70
204 { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x51 || 0x71
205 { CCCOL_WHITE, CCFONT_REGULAR, 4 }, // 0x52 || 0x72
206 { CCCOL_WHITE, CCFONT_UNDERLINED, 4 }, // 0x53 || 0x73
207 { CCCOL_WHITE, CCFONT_REGULAR, 8 }, // 0x54 || 0x74
208 { CCCOL_WHITE, CCFONT_UNDERLINED, 8 }, // 0x55 || 0x75
209 { CCCOL_WHITE, CCFONT_REGULAR, 12 }, // 0x56 || 0x76
210 { CCCOL_WHITE, CCFONT_UNDERLINED, 12 }, // 0x57 || 0x77
211 { CCCOL_WHITE, CCFONT_REGULAR, 16 }, // 0x58 || 0x78
212 { CCCOL_WHITE, CCFONT_UNDERLINED, 16 }, // 0x59 || 0x79
213 { CCCOL_WHITE, CCFONT_REGULAR, 20 }, // 0x5a || 0x7a
214 { CCCOL_WHITE, CCFONT_UNDERLINED, 20 }, // 0x5b || 0x7b
215 { CCCOL_WHITE, CCFONT_REGULAR, 24 }, // 0x5c || 0x7c
216 { CCCOL_WHITE, CCFONT_UNDERLINED, 24 }, // 0x5d || 0x7d
217 { CCCOL_WHITE, CCFONT_REGULAR, 28 }, // 0x5e || 0x7e
218 { CCCOL_WHITE, CCFONT_UNDERLINED, 28 } // 0x5f || 0x7f
219 /* total 32 entries */
220 };
221
222 struct Screen {
223 /* +1 is used to compensate null character of string */
224 uint8_t characters[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
225 uint8_t charsets[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
226 uint8_t colors[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
227 uint8_t bgs[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
228 uint8_t fonts[SCREEN_ROWS+1][SCREEN_COLUMNS+1];
229 /*
230 * Bitmask of used rows; if a bit is not set, the
231 * corresponding row is not used.
232 * for setting row 1 use row | (1 << 0)
233 * for setting row 15 use row | (1 << 14)
234 */
235 int16_t row_used;
236 };
237
238 typedef struct CCaptionSubContext {
239 AVClass *class;
240 int real_time;
241 int real_time_latency_msec;
242 int data_field;
243 struct Screen screen[2];
244 int active_screen;
245 uint8_t cursor_row;
246 uint8_t cursor_column;
247 uint8_t cursor_color;
248 uint8_t bg_color;
249 uint8_t cursor_font;
250 uint8_t cursor_charset;
251 AVBPrint buffer[2];
252 int buffer_index;
253 int buffer_changed;
254 int rollup;
255 enum cc_mode mode;
256 int64_t buffer_time[2];
257 int screen_touched;
258 int64_t last_real_time;
259 uint8_t prev_cmd[2];
260 int readorder;
261 } CCaptionSubContext;
262
263 14 static av_cold int init_decoder(AVCodecContext *avctx)
264 {
265 14 CCaptionSubContext *ctx = avctx->priv_data;
266
267 14 av_bprint_init(&ctx->buffer[0], 0, AV_BPRINT_SIZE_UNLIMITED);
268 14 av_bprint_init(&ctx->buffer[1], 0, AV_BPRINT_SIZE_UNLIMITED);
269 /* taking by default roll up to 2 */
270 14 ctx->mode = CCMODE_ROLLUP;
271 14 ctx->bg_color = CCCOL_BLACK;
272 14 ctx->rollup = 2;
273 14 ctx->cursor_row = 10;
274 14 return ff_ass_subtitle_header(avctx, "Monospace",
275 ASS_DEFAULT_FONT_SIZE,
276 ASS_DEFAULT_COLOR,
277 ASS_DEFAULT_BACK_COLOR,
278 ASS_DEFAULT_BOLD,
279 ASS_DEFAULT_ITALIC,
280 ASS_DEFAULT_UNDERLINE,
281 3,
282 ASS_DEFAULT_ALIGNMENT);
283 }
284
285 14 static av_cold int close_decoder(AVCodecContext *avctx)
286 {
287 14 CCaptionSubContext *ctx = avctx->priv_data;
288 14 av_bprint_finalize(&ctx->buffer[0], NULL);
289 14 av_bprint_finalize(&ctx->buffer[1], NULL);
290 14 return 0;
291 }
292
293 static void flush_decoder(AVCodecContext *avctx)
294 {
295 CCaptionSubContext *ctx = avctx->priv_data;
296 ctx->screen[0].row_used = 0;
297 ctx->screen[1].row_used = 0;
298 ctx->prev_cmd[0] = 0;
299 ctx->prev_cmd[1] = 0;
300 ctx->mode = CCMODE_ROLLUP;
301 ctx->rollup = 2;
302 ctx->cursor_row = 10;
303 ctx->cursor_column = 0;
304 ctx->cursor_font = 0;
305 ctx->cursor_color = 0;
306 ctx->bg_color = CCCOL_BLACK;
307 ctx->cursor_charset = 0;
308 ctx->active_screen = 0;
309 ctx->last_real_time = 0;
310 ctx->screen_touched = 0;
311 ctx->buffer_changed = 0;
312 if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
313 ctx->readorder = 0;
314 av_bprint_clear(&ctx->buffer[0]);
315 av_bprint_clear(&ctx->buffer[1]);
316 }
317
318 /**
319 * @param ctx closed caption context just to print log
320 */
321 5999 static void write_char(CCaptionSubContext *ctx, struct Screen *screen, char ch)
322 {
323 5999 uint8_t col = ctx->cursor_column;
324 5999 char *row = screen->characters[ctx->cursor_row];
325 5999 char *font = screen->fonts[ctx->cursor_row];
326 5999 char *color = screen->colors[ctx->cursor_row];
327 5999 char *bg = screen->bgs[ctx->cursor_row];
328 5999 char *charset = screen->charsets[ctx->cursor_row];
329
330
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5999 if (col < SCREEN_COLUMNS) {
331 5990 row[col] = ch;
332 5990 font[col] = ctx->cursor_font;
333 5990 color[col] = ctx->cursor_color;
334 5990 bg[col] = ctx->bg_color;
335 5990 charset[col] = ctx->cursor_charset;
336 5990 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
337
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5990 if (ch) ctx->cursor_column++;
338 5990 return;
339 }
340 /* We have extra space at end only for null character */
341
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9 else if (col == SCREEN_COLUMNS && ch == 0) {
342 9 row[col] = ch;
343 9 return;
344 }
345 else {
346 av_log(ctx, AV_LOG_WARNING, "Data Ignored since exceeding screen width\n");
347 return;
348 }
349 }
350
351 /**
352 * This function after validating parity bit, also remove it from data pair.
353 * The first byte doesn't pass parity, we replace it with a solid blank
354 * and process the pair.
355 * If the second byte doesn't pass parity, it returns INVALIDDATA
356 * user can ignore the whole pair and pass the other pair.
357 */
358 13817 static int validate_cc_data_pair(const uint8_t *cc_data_pair, uint8_t *hi)
359 {
360 13817 uint8_t cc_valid = (*cc_data_pair & 4) >>2;
361 13817 uint8_t cc_type = *cc_data_pair & 3;
362
363 13817 *hi = cc_data_pair[1];
364
365
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13817 if (!cc_valid)
366 9312 return AVERROR_INVALIDDATA;
367
368 // if EIA-608 data then verify parity.
369
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4505 if (cc_type==0 || cc_type==1) {
370
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3949 if (!av_parity(cc_data_pair[2])) {
371 return AVERROR_INVALIDDATA;
372 }
373
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3949 if (!av_parity(cc_data_pair[1])) {
374 *hi = 0x7F;
375 }
376 }
377
378 //Skip non-data
379
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4505 if ((cc_data_pair[0] == 0xFA || cc_data_pair[0] == 0xFC || cc_data_pair[0] == 0xFD)
380
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3545 && (cc_data_pair[1] & 0x7F) == 0 && (cc_data_pair[2] & 0x7F) == 0)
381 884 return AVERROR_PATCHWELCOME;
382
383 //skip 708 data
384
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3621 if (cc_type == 3 || cc_type == 2)
385 556 return AVERROR_PATCHWELCOME;
386
387 3065 return 0;
388 }
389
390 1889 static struct Screen *get_writing_screen(CCaptionSubContext *ctx)
391 {
392
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1889 switch (ctx->mode) {
393 1676 case CCMODE_POPON:
394 // use Inactive screen
395
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1676 return ctx->screen + !ctx->active_screen;
396 213 case CCMODE_PAINTON:
397 case CCMODE_ROLLUP:
398 case CCMODE_TEXT:
399 // use active screen
400 213 return ctx->screen + ctx->active_screen;
401 }
402 /* It was never an option */
403 return NULL;
404 }
405
406 15 static void roll_up(CCaptionSubContext *ctx)
407 {
408 struct Screen *screen;
409 int i, keep_lines;
410
411
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15 if (ctx->mode == CCMODE_TEXT)
412 return;
413
414 15 screen = get_writing_screen(ctx);
415
416 /* +1 signify cursor_row starts from 0
417 * Can't keep lines less then row cursor pos
418 */
419
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15 keep_lines = FFMIN(ctx->cursor_row + 1, ctx->rollup);
420
421
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240 for (i = 0; i < SCREEN_ROWS; i++) {
422
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225 if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row)
423 30 continue;
424 195 UNSET_FLAG(screen->row_used, i);
425 }
426
427
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37 for (i = 0; i < keep_lines && screen->row_used; i++) {
428 22 const int i_row = ctx->cursor_row - keep_lines + i + 1;
429
430 22 memcpy(screen->characters[i_row], screen->characters[i_row+1], SCREEN_COLUMNS);
431 22 memcpy(screen->colors[i_row], screen->colors[i_row+1], SCREEN_COLUMNS);
432 22 memcpy(screen->bgs[i_row], screen->bgs[i_row+1], SCREEN_COLUMNS);
433 22 memcpy(screen->fonts[i_row], screen->fonts[i_row+1], SCREEN_COLUMNS);
434 22 memcpy(screen->charsets[i_row], screen->charsets[i_row+1], SCREEN_COLUMNS);
435
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22 if (CHECK_FLAG(screen->row_used, i_row + 1))
436 11 SET_FLAG(screen->row_used, i_row);
437 }
438
439 15 UNSET_FLAG(screen->row_used, ctx->cursor_row);
440 }
441
442 227 static int capture_screen(CCaptionSubContext *ctx)
443 {
444 227 int i, j, tab = 0;
445 227 struct Screen *screen = ctx->screen + ctx->active_screen;
446 227 enum cc_font prev_font = CCFONT_REGULAR;
447 227 enum cc_color_code prev_color = CCCOL_WHITE;
448 227 enum cc_color_code prev_bg_color = CCCOL_BLACK;
449 227 const int bidx = ctx->buffer_index;
450
451 227 av_bprint_clear(&ctx->buffer[bidx]);
452
453
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2042 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
454 {
455
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1815 if (CHECK_FLAG(screen->row_used, i)) {
456 232 const char *row = screen->characters[i];
457 232 const char *charset = screen->charsets[i];
458 232 j = 0;
459
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1396 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN)
460 1164 j++;
461
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232 if (!tab || j < tab)
462 180 tab = j;
463 }
464 }
465
466
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2042 for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
467 {
468
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1815 if (CHECK_FLAG(screen->row_used, i)) {
469 232 const char *row = screen->characters[i];
470 232 const char *font = screen->fonts[i];
471 232 const char *bg = screen->bgs[i];
472 232 const char *color = screen->colors[i];
473 232 const char *charset = screen->charsets[i];
474 const char *override;
475 232 int x, y, seen_char = 0;
476 232 j = 0;
477
478 /* skip leading space */
479
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1203 while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN && j < tab)
480 971 j++;
481
482 232 x = ASS_DEFAULT_PLAYRESX * (0.1 + 0.0250 * j);
483 232 y = ASS_DEFAULT_PLAYRESY * (0.1 + 0.0533 * i);
484 232 av_bprintf(&ctx->buffer[bidx], "{\\an7}{\\pos(%d,%d)}", x, y);
485
486
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4195 for (; j < SCREEN_COLUMNS; j++) {
487 4186 const char *e_tag = "", *s_tag = "", *c_tag = "", *b_tag = "";
488
489
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4186 if (row[j] == 0)
490 223 break;
491
492
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3963 if (prev_font != font[j]) {
493
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64 switch (prev_font) {
494 20 case CCFONT_ITALICS:
495 20 e_tag = "{\\i0}";
496 20 break;
497 case CCFONT_UNDERLINED:
498 e_tag = "{\\u0}";
499 break;
500 case CCFONT_UNDERLINED_ITALICS:
501 e_tag = "{\\u0}{\\i0}";
502 break;
503 }
504
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64 switch (font[j]) {
505 44 case CCFONT_ITALICS:
506 44 s_tag = "{\\i1}";
507 44 break;
508 case CCFONT_UNDERLINED:
509 s_tag = "{\\u1}";
510 break;
511 case CCFONT_UNDERLINED_ITALICS:
512 s_tag = "{\\u1}{\\i1}";
513 break;
514 }
515 }
516
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3963 if (prev_color != color[j]) {
517 switch (color[j]) {
518 case CCCOL_WHITE:
519 c_tag = "{\\c&HFFFFFF&}";
520 break;
521 case CCCOL_GREEN:
522 c_tag = "{\\c&H00FF00&}";
523 break;
524 case CCCOL_BLUE:
525 c_tag = "{\\c&HFF0000&}";
526 break;
527 case CCCOL_CYAN:
528 c_tag = "{\\c&HFFFF00&}";
529 break;
530 case CCCOL_RED:
531 c_tag = "{\\c&H0000FF&}";
532 break;
533 case CCCOL_YELLOW:
534 c_tag = "{\\c&H00FFFF&}";
535 break;
536 case CCCOL_MAGENTA:
537 c_tag = "{\\c&HFF00FF&}";
538 break;
539 }
540 }
541
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3963 if (prev_bg_color != bg[j]) {
542 switch (bg[j]) {
543 case CCCOL_WHITE:
544 b_tag = "{\\3c&HFFFFFF&}";
545 break;
546 case CCCOL_GREEN:
547 b_tag = "{\\3c&H00FF00&}";
548 break;
549 case CCCOL_BLUE:
550 b_tag = "{\\3c&HFF0000&}";
551 break;
552 case CCCOL_CYAN:
553 b_tag = "{\\3c&HFFFF00&}";
554 break;
555 case CCCOL_RED:
556 b_tag = "{\\3c&H0000FF&}";
557 break;
558 case CCCOL_YELLOW:
559 b_tag = "{\\3c&H00FFFF&}";
560 break;
561 case CCCOL_MAGENTA:
562 b_tag = "{\\3c&HFF00FF&}";
563 break;
564 case CCCOL_BLACK:
565 b_tag = "{\\3c&H000000&}";
566 break;
567 }
568 }
569
570 3963 prev_font = font[j];
571 3963 prev_color = color[j];
572 3963 prev_bg_color = bg[j];
573 3963 override = charset_overrides[(int)charset[j]][(int)row[j]];
574
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3963 if (override) {
575 11 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%s", e_tag, s_tag, c_tag, b_tag, override);
576 11 seen_char = 1;
577
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3952 } else if (row[j] == ' ' && !seen_char) {
578 193 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s\\h", e_tag, s_tag, c_tag, b_tag);
579 } else {
580 3759 av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%c", e_tag, s_tag, c_tag, b_tag, row[j]);
581 3759 seen_char = 1;
582 }
583
584 }
585 232 av_bprintf(&ctx->buffer[bidx], "\\N");
586 }
587 }
588
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227 if (!av_bprint_is_complete(&ctx->buffer[bidx]))
589 return AVERROR(ENOMEM);
590
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227 if (screen->row_used && ctx->buffer[bidx].len >= 2) {
591 121 ctx->buffer[bidx].len -= 2;
592 121 ctx->buffer[bidx].str[ctx->buffer[bidx].len] = 0;
593 }
594 227 ctx->buffer_changed = 1;
595 227 return 0;
596 }
597
598 203 static void update_time(CCaptionSubContext *ctx, int64_t pts)
599 {
600 203 ctx->buffer_time[0] = ctx->buffer_time[1];
601 203 ctx->buffer_time[1] = pts;
602 203 }
603
604 static void handle_bgattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
605 {
606 const int i = (lo & 0xf) >> 1;
607
608 ctx->bg_color = bg_attribs[i];
609 }
610
611 15 static void handle_textattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
612 {
613 15 int i = lo - 0x20;
614 15 struct Screen *screen = get_writing_screen(ctx);
615
616
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15 if (i >= 32)
617 return;
618
619 15 ctx->cursor_color = pac2_attribs[i][0];
620 15 ctx->cursor_font = pac2_attribs[i][1];
621
622 15 SET_FLAG(screen->row_used, ctx->cursor_row);
623 15 write_char(ctx, screen, ' ');
624 }
625
626 203 static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
627 {
628 static const int8_t row_map[] = {
629 11, -1, 1, 2, 3, 4, 12, 13, 14, 15, 5, 6, 7, 8, 9, 10
630 };
631 203 const int index = ( (hi<<1) & 0x0e) | ( (lo>>5) & 0x01 );
632 203 struct Screen *screen = get_writing_screen(ctx);
633 int indent, i;
634
635
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203 if (row_map[index] <= 0) {
636 av_log(ctx, AV_LOG_DEBUG, "Invalid pac index encountered\n");
637 return;
638 }
639
640 203 lo &= 0x1f;
641
642 203 ctx->cursor_row = row_map[index] - 1;
643 203 ctx->cursor_color = pac2_attribs[lo][0];
644 203 ctx->cursor_font = pac2_attribs[lo][1];
645 203 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
646 203 ctx->cursor_column = 0;
647 203 indent = pac2_attribs[lo][2];
648
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1339 for (i = 0; i < indent; i++) {
649 1136 write_char(ctx, screen, ' ');
650 }
651 }
652
653 197 static int handle_edm(CCaptionSubContext *ctx)
654 {
655 197 struct Screen *screen = ctx->screen + ctx->active_screen;
656 int ret;
657
658 // In buffered mode, keep writing to screen until it is wiped.
659 // Before wiping the display, capture contents to emit subtitle.
660
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197 if (!ctx->real_time)
661 197 ret = capture_screen(ctx);
662
663 197 screen->row_used = 0;
664 197 ctx->bg_color = CCCOL_BLACK;
665
666 // In realtime mode, emit an empty caption so the last one doesn't
667 // stay on the screen.
668
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197 if (ctx->real_time)
669 ret = capture_screen(ctx);
670
671 197 return ret;
672 }
673
674 93 static int handle_eoc(CCaptionSubContext *ctx)
675 {
676 int ret;
677
678 93 ctx->active_screen = !ctx->active_screen;
679
680 // In buffered mode, we wait til the *next* EOC and
681 // capture what was already on the screen since the last EOC.
682
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93 if (!ctx->real_time)
683 93 ret = handle_edm(ctx);
684
685 93 ctx->cursor_column = 0;
686
687 // In realtime mode, we display the buffered contents (after
688 // flipping the buffer to active above) as soon as EOC arrives.
689
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93 if (ctx->real_time)
690 ret = capture_screen(ctx);
691
692 93 return ret;
693 }
694
695 static void handle_delete_end_of_row(CCaptionSubContext *ctx)
696 {
697 struct Screen *screen = get_writing_screen(ctx);
698 write_char(ctx, screen, 0);
699 }
700
701 1656 static void handle_char(CCaptionSubContext *ctx, char hi, char lo)
702 {
703 1656 struct Screen *screen = get_writing_screen(ctx);
704
705 1656 SET_FLAG(screen->row_used, ctx->cursor_row);
706
707
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1656 switch (hi) {
708 case 0x11:
709 ctx->cursor_charset = CCSET_SPECIAL_AMERICAN;
710 break;
711 case 0x12:
712 if (ctx->cursor_column > 0)
713 ctx->cursor_column -= 1;
714 ctx->cursor_charset = CCSET_EXTENDED_SPANISH_FRENCH_MISC;
715 break;
716 case 0x13:
717 if (ctx->cursor_column > 0)
718 ctx->cursor_column -= 1;
719 ctx->cursor_charset = CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH;
720 break;
721 1656 default:
722 1656 ctx->cursor_charset = CCSET_BASIC_AMERICAN;
723 1656 write_char(ctx, screen, hi);
724 1656 break;
725 }
726
727
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1656 if (lo) {
728 1536 write_char(ctx, screen, lo);
729 }
730 1656 write_char(ctx, screen, 0);
731
732
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1656 if (ctx->mode != CCMODE_POPON)
733 175 ctx->screen_touched = 1;
734
735 if (lo)
736 ff_dlog(ctx, "(%c,%c)\n", hi, lo);
737 else
738 ff_dlog(ctx, "(%c)\n", hi);
739 1656 }
740
741 2863 static int process_cc608(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
742 {
743 2863 int ret = 0;
744
745
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2863 if (hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) {
746 670 return 0;
747 }
748
749 /* set prev command */
750 2193 ctx->prev_cmd[0] = hi;
751 2193 ctx->prev_cmd[1] = lo;
752
753
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2193 if ( (hi == 0x10 && (lo >= 0x40 && lo <= 0x5f)) ||
754
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2193 ( (hi >= 0x11 && hi <= 0x17) && (lo >= 0x40 && lo <= 0x7f) ) ) {
755 203 handle_pac(ctx, hi, lo);
756
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1990 } else if ( ( hi == 0x11 && lo >= 0x20 && lo <= 0x2f ) ||
757 ( hi == 0x17 && lo >= 0x2e && lo <= 0x2f) ) {
758 15 handle_textattr(ctx, hi, lo);
759
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1975 } else if ((hi == 0x10 && lo >= 0x20 && lo <= 0x2f)) {
760 handle_bgattr(ctx, hi, lo);
761
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1975 } else if (hi == 0x14 || hi == 0x15 || hi == 0x1c) {
762
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319 switch (lo) {
763 92 case 0x20:
764 /* resume caption loading */
765 92 ctx->mode = CCMODE_POPON;
766 92 break;
767 case 0x24:
768 handle_delete_end_of_row(ctx);
769 break;
770 15 case 0x25:
771 case 0x26:
772 case 0x27:
773 15 ctx->rollup = lo - 0x23;
774 15 ctx->mode = CCMODE_ROLLUP;
775 15 break;
776 case 0x29:
777 /* resume direct captioning */
778 ctx->mode = CCMODE_PAINTON;
779 break;
780 case 0x2b:
781 /* resume text display */
782 ctx->mode = CCMODE_TEXT;
783 break;
784 104 case 0x2c:
785 /* erase display memory */
786 104 handle_edm(ctx);
787 104 break;
788 15 case 0x2d:
789 /* carriage return */
790 ff_dlog(ctx, "carriage return\n");
791
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15 if (!ctx->real_time)
792 6 ret = capture_screen(ctx);
793 15 roll_up(ctx);
794 15 ctx->cursor_column = 0;
795 15 break;
796 case 0x2e:
797 /* erase buffered (non displayed) memory */
798 // Only in realtime mode. In buffered mode, we re-use the inactive screen
799 // for our own buffering.
800 if (ctx->real_time) {
801 struct Screen *screen = ctx->screen + !ctx->active_screen;
802 screen->row_used = 0;
803 }
804 break;
805 93 case 0x2f:
806 /* end of caption */
807 ff_dlog(ctx, "handle_eoc\n");
808 93 ret = handle_eoc(ctx);
809 93 break;
810 default:
811 ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
812 break;
813 }
814
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1656 } else if (hi >= 0x11 && hi <= 0x13) {
815 /* Special characters */
816 handle_char(ctx, hi, lo);
817
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1656 } else if (hi >= 0x20) {
818 /* Standard characters (always in pairs) */
819 1656 handle_char(ctx, hi, lo);
820 1656 ctx->prev_cmd[0] = ctx->prev_cmd[1] = 0;
821 } else if (hi == 0x17 && lo >= 0x21 && lo <= 0x23) {
822 int i;
823 /* Tab offsets (spacing) */
824 for (i = 0; i < lo - 0x20; i++) {
825 handle_char(ctx, ' ', 0);
826 }
827 } else {
828 /* Ignoring all other non data code */
829 ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
830 }
831
832 2193 return ret;
833 }
834
835 852 static int decode(AVCodecContext *avctx, AVSubtitle *sub,
836 int *got_sub, const AVPacket *avpkt)
837 {
838 852 CCaptionSubContext *ctx = avctx->priv_data;
839 852 int64_t in_time = sub->pts;
840 int64_t start_time;
841 int64_t end_time;
842 852 int bidx = ctx->buffer_index;
843 852 const uint8_t *bptr = avpkt->data;
844 852 int len = avpkt->size;
845 852 int ret = 0;
846 int i;
847 852 unsigned nb_rect_allocated = 0;
848
849
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14669 for (i = 0; i < len; i += 3) {
850 13817 uint8_t hi, cc_type = bptr[i] & 1;
851
852
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13817 if (ctx->data_field < 0)
853 6 ctx->data_field = cc_type;
854
855
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13817 if (validate_cc_data_pair(bptr + i, &hi))
856 13614 continue;
857
858
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3065 if (cc_type != ctx->data_field)
859 202 continue;
860
861 2863 ret = process_cc608(ctx, hi & 0x7f, bptr[i + 2] & 0x7f);
862
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2863 if (ret < 0)
863 return ret;
864
865
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2863 if (!ctx->buffer_changed)
866 2660 continue;
867 203 ctx->buffer_changed = 0;
868
869
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203 if (!ctx->real_time && ctx->mode == CCMODE_POPON)
870 197 ctx->buffer_index = bidx = !ctx->buffer_index;
871
872 203 update_time(ctx, in_time);
873
874
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203 if (ctx->buffer[bidx].str[0] || ctx->real_time) {
875 ff_dlog(ctx, "cdp writing data (%s)\n", ctx->buffer[bidx].str);
876 97 start_time = ctx->buffer_time[0];
877 97 sub->pts = start_time;
878 97 end_time = ctx->buffer_time[1];
879
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97 if (!ctx->real_time)
880 97 sub->end_display_time = av_rescale_q(end_time - start_time,
881 97 AV_TIME_BASE_Q, ms_tb);
882 else
883 sub->end_display_time = -1;
884 97 ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
885
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97 if (ret < 0)
886 return ret;
887 97 ctx->last_real_time = sub->pts;
888 97 ctx->screen_touched = 0;
889 }
890 }
891
892
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852 if (!bptr && !ctx->real_time && ctx->buffer[!ctx->buffer_index].str[0]) {
893 bidx = !ctx->buffer_index;
894 ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
895 if (ret < 0)
896 return ret;
897 av_bprint_clear(&ctx->buffer[bidx]);
898 sub->pts = ctx->buffer_time[1];
899 sub->end_display_time = av_rescale_q(ctx->buffer_time[1] - ctx->buffer_time[0],
900 AV_TIME_BASE_Q, ms_tb);
901 if (sub->end_display_time == 0)
902 sub->end_display_time = ctx->buffer[bidx].len * 20;
903 }
904
905
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852 if (ctx->real_time && ctx->screen_touched &&
906
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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)) {
907 24 ctx->last_real_time = sub->pts;
908 24 ctx->screen_touched = 0;
909
910 24 capture_screen(ctx);
911 24 ctx->buffer_changed = 0;
912
913 24 ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated);
914
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24 if (ret < 0)
915 return ret;
916 24 sub->end_display_time = -1;
917 }
918
919 852 *got_sub = sub->num_rects > 0;
920 852 return avpkt->size;
921 }
922
923 #define OFFSET(x) offsetof(CCaptionSubContext, x)
924 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
925 static const AVOption options[] = {
926 { "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 },
927 { "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 },
928 { "data_field", "select data field", OFFSET(data_field), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, SD, .unit = "data_field" },
929 { "auto", "pick first one that appears", 0, AV_OPT_TYPE_CONST, { .i64 =-1 }, 0, 0, SD, .unit = "data_field" },
930 { "first", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, SD, .unit = "data_field" },
931 { "second", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, SD, .unit = "data_field" },
932 {NULL}
933 };
934
935 static const AVClass ccaption_dec_class = {
936 .class_name = "Closed caption Decoder",
937 .item_name = av_default_item_name,
938 .option = options,
939 .version = LIBAVUTIL_VERSION_INT,
940 };
941
942 const FFCodec ff_ccaption_decoder = {
943 .p.name = "cc_dec",
944 CODEC_LONG_NAME("Closed Caption (EIA-608 / CEA-708)"),
945 .p.type = AVMEDIA_TYPE_SUBTITLE,
946 .p.id = AV_CODEC_ID_EIA_608,
947 .p.priv_class = &ccaption_dec_class,
948 .p.capabilities = AV_CODEC_CAP_DELAY,
949 .priv_data_size = sizeof(CCaptionSubContext),
950 .init = init_decoder,
951 .close = close_decoder,
952 .flush = flush_decoder,
953 FF_CODEC_DECODE_SUB_CB(decode),
954 };
955