FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/dvbsubenc.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 171 307 55.7%
Branches: 95 232 40.9%

Line Branch Exec Source
1 /*
2 * DVB subtitle encoding
3 * Copyright (c) 2005 Fabrice Bellard
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 #include "avcodec.h"
22 #include "bytestream.h"
23 #include "codec_internal.h"
24 #include "libavutil/colorspace.h"
25
26 typedef struct DVBSubtitleContext {
27 int object_version;
28 } DVBSubtitleContext;
29
30 #define PUTBITS2(val)\
31 {\
32 bitbuf |= (val) << bitcnt;\
33 bitcnt -= 2;\
34 if (bitcnt < 0) {\
35 bitcnt = 6;\
36 *q++ = bitbuf;\
37 bitbuf = 0;\
38 }\
39 }
40
41 static int dvb_encode_rle2(uint8_t **pq, int buf_size,
42 const uint8_t *bitmap, int linesize,
43 int w, int h)
44 {
45 uint8_t *q, *line_begin;
46 unsigned int bitbuf;
47 int bitcnt;
48 int x, y, len, x1, v, color;
49
50 q = *pq;
51
52 for(y = 0; y < h; y++) {
53 // Worst case line is 3 bits per value + 4 bytes overhead
54 if (buf_size * 8 < w * 3 + 32)
55 return AVERROR_BUFFER_TOO_SMALL;
56 line_begin = q;
57 *q++ = 0x10;
58 bitbuf = 0;
59 bitcnt = 6;
60
61 x = 0;
62 while (x < w) {
63 x1 = x;
64 color = bitmap[x1++];
65 while (x1 < w && bitmap[x1] == color)
66 x1++;
67 len = x1 - x;
68 if (color == 0 && len == 2) {
69 PUTBITS2(0);
70 PUTBITS2(0);
71 PUTBITS2(1);
72 } else if (len >= 3 && len <= 10) {
73 v = len - 3;
74 PUTBITS2(0);
75 PUTBITS2((v >> 2) | 2);
76 PUTBITS2(v & 3);
77 PUTBITS2(color);
78 } else if (len >= 12 && len <= 27) {
79 v = len - 12;
80 PUTBITS2(0);
81 PUTBITS2(0);
82 PUTBITS2(2);
83 PUTBITS2(v >> 2);
84 PUTBITS2(v & 3);
85 PUTBITS2(color);
86 } else if (len >= 29) {
87 /* length = 29 ... 284 */
88 if (len > 284)
89 len = 284;
90 v = len - 29;
91 PUTBITS2(0);
92 PUTBITS2(0);
93 PUTBITS2(3);
94 PUTBITS2((v >> 6));
95 PUTBITS2((v >> 4) & 3);
96 PUTBITS2((v >> 2) & 3);
97 PUTBITS2(v & 3);
98 PUTBITS2(color);
99 } else {
100 PUTBITS2(color);
101 if (color == 0) {
102 PUTBITS2(1);
103 }
104 len = 1;
105 }
106 x += len;
107 }
108 /* end of line */
109 PUTBITS2(0);
110 PUTBITS2(0);
111 PUTBITS2(0);
112 if (bitcnt != 6) {
113 *q++ = bitbuf;
114 }
115 *q++ = 0xf0;
116 bitmap += linesize;
117 buf_size -= q - line_begin;
118 }
119 len = q - *pq;
120 *pq = q;
121 return len;
122 }
123
124 #define PUTBITS4(val)\
125 {\
126 bitbuf |= (val) << bitcnt;\
127 bitcnt -= 4;\
128 if (bitcnt < 0) {\
129 bitcnt = 4;\
130 *q++ = bitbuf;\
131 bitbuf = 0;\
132 }\
133 }
134
135 /* some DVB decoders only implement 4 bits/pixel */
136 132 static int dvb_encode_rle4(uint8_t **pq, int buf_size,
137 const uint8_t *bitmap, int linesize,
138 int w, int h)
139 {
140 uint8_t *q, *line_begin;
141 unsigned int bitbuf;
142 int bitcnt;
143 int x, y, len, x1, v, color;
144
145 132 q = *pq;
146
147
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2508 for(y = 0; y < h; y++) {
148 // Worst case line is 6 bits per value, + 4 bytes overhead
149
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2376 if (buf_size * 8 < w * 6 + 32)
150 return AVERROR_BUFFER_TOO_SMALL;
151 2376 line_begin = q;
152 2376 *q++ = 0x11;
153 2376 bitbuf = 0;
154 2376 bitcnt = 4;
155
156 2376 x = 0;
157
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256530 while (x < w) {
158 254154 x1 = x;
159 254154 color = bitmap[x1++];
160
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1992511 while (x1 < w && bitmap[x1] == color)
161 1738357 x1++;
162 254154 len = x1 - x;
163
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254154 if (color == 0 && len == 2) {
164 PUTBITS4(0);
165 PUTBITS4(0xd);
166
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254154 } else if (color == 0 && (len >= 3 && len <= 9)) {
167
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36 PUTBITS4(0);
168
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36 PUTBITS4(len - 2);
169
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254118 } else if (len >= 4 && len <= 7) {
170
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18199 PUTBITS4(0);
171
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18199 PUTBITS4(8 + len - 4);
172
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18199 PUTBITS4(color);
173
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235919 } else if (len >= 9 && len <= 24) {
174
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7926 PUTBITS4(0);
175
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7926 PUTBITS4(0xe);
176
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7926 PUTBITS4(len - 9);
177
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7926 PUTBITS4(color);
178
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227993 } else if (len >= 25) {
179
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9232 if (len > 280)
180 1469 len = 280;
181 9232 v = len - 25;
182
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9232 PUTBITS4(0);
183
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9232 PUTBITS4(0xf);
184
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9232 PUTBITS4(v >> 4);
185
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9232 PUTBITS4(v & 0xf);
186
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9232 PUTBITS4(color);
187 } else {
188
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218761 PUTBITS4(color);
189
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218761 if (color == 0) {
190 PUTBITS4(0xc);
191 }
192 218761 len = 1;
193 }
194 254154 x += len;
195 }
196 /* end of line */
197
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2376 PUTBITS4(0);
198
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2376 PUTBITS4(0);
199
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2376 if (bitcnt != 4) {
200 1024 *q++ = bitbuf;
201 }
202 2376 *q++ = 0xf0;
203 2376 bitmap += linesize;
204 2376 buf_size -= q - line_begin;
205 }
206 132 len = q - *pq;
207 132 *pq = q;
208 132 return len;
209 }
210
211 static int dvb_encode_rle8(uint8_t **pq, int buf_size,
212 const uint8_t *bitmap, int linesize,
213 int w, int h)
214 {
215 uint8_t *q, *line_begin;
216 int x, y, len, x1, color;
217
218 q = *pq;
219
220 for (y = 0; y < h; y++) {
221 // Worst case line is 12 bits per value, + 3 bytes overhead
222 if (buf_size * 8 < w * 12 + 24)
223 return AVERROR_BUFFER_TOO_SMALL;
224 line_begin = q;
225 *q++ = 0x12;
226
227 x = 0;
228 while (x < w) {
229 x1 = x;
230 color = bitmap[x1++];
231 while (x1 < w && bitmap[x1] == color)
232 x1++;
233 len = x1 - x;
234 if (len == 1 && color) {
235 // 00000001 to 11111111 1 pixel in colour x
236 *q++ = color;
237 } else {
238 if (color == 0x00) {
239 // 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0)
240 len = FFMIN(len, 127);
241 *q++ = 0x00;
242 *q++ = len;
243 } else if (len > 2) {
244 // 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2)
245 len = FFMIN(len, 127);
246 *q++ = 0x00;
247 *q++ = 0x80+len;
248 *q++ = color;
249 }
250 else if (len == 2) {
251 *q++ = color;
252 *q++ = color;
253 } else {
254 *q++ = color;
255 len = 1;
256 }
257 }
258 x += len;
259 }
260 /* end of line */
261 // 00000000 end of 8-bit/pixel_code_string
262 *q++ = 0x00;
263 *q++ = 0xf0;
264 bitmap += linesize;
265 buf_size -= q - line_begin;
266 }
267 len = q - *pq;
268 *pq = q;
269 return len;
270 }
271
272 72 static int dvbsub_encode(AVCodecContext *avctx, uint8_t *outbuf, int buf_size,
273 const AVSubtitle *h)
274 {
275 72 DVBSubtitleContext *s = avctx->priv_data;
276 uint8_t *q, *pseg_len;
277 int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;
278
279
280 72 q = outbuf;
281
282 72 page_id = 1;
283
284
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72 if (h->num_rects && !h->rects)
285 return AVERROR(EINVAL);
286
287
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72 if (avctx->width > 0 && avctx->height > 0) {
288 if (buf_size < 11)
289 return AVERROR_BUFFER_TOO_SMALL;
290 /* display definition segment */
291 *q++ = 0x0f; /* sync_byte */
292 *q++ = 0x14; /* segment_type */
293 bytestream_put_be16(&q, page_id);
294 pseg_len = q;
295 q += 2; /* segment length */
296 *q++ = 0x00; /* dds version number & display window flag */
297 bytestream_put_be16(&q, avctx->width - 1); /* display width */
298 bytestream_put_be16(&q, avctx->height - 1); /* display height */
299 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
300 buf_size -= 11;
301 }
302
303 /* page composition segment */
304
305
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72 if (buf_size < 8 + h->num_rects * 6)
306 return AVERROR_BUFFER_TOO_SMALL;
307 72 *q++ = 0x0f; /* sync_byte */
308 72 *q++ = 0x10; /* segment_type */
309 72 bytestream_put_be16(&q, page_id);
310 72 pseg_len = q;
311 72 q += 2; /* segment length */
312 72 *q++ = 30; /* page_timeout (seconds) */
313 72 page_state = 2; /* mode change */
314 /* page_version = 0 + page_state */
315 72 *q++ = (s->object_version << 4) | (page_state << 2) | 3;
316
317
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138 for (region_id = 0; region_id < h->num_rects; region_id++) {
318 66 *q++ = region_id;
319 66 *q++ = 0xff; /* reserved */
320 66 bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
321 66 bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */
322 }
323
324 72 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
325 72 buf_size -= 8 + h->num_rects * 6;
326
327
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72 if (h->num_rects) {
328
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102 for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
329
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66 if (buf_size < 6 + h->rects[clut_id]->nb_colors * 6)
330 return AVERROR_BUFFER_TOO_SMALL;
331
332 /* CLUT segment */
333
334
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66 if (h->rects[clut_id]->nb_colors <= 4) {
335 /* 2 bpp, some decoders do not support it correctly */
336 bpp_index = 0;
337
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66 } else if (h->rects[clut_id]->nb_colors <= 16) {
338 /* 4 bpp, standard encoding */
339 66 bpp_index = 1;
340 } else if (h->rects[clut_id]->nb_colors <= 256) {
341 /* 8 bpp, standard encoding */
342 bpp_index = 2;
343 } else {
344 return AVERROR(EINVAL);
345 }
346
347
348 /* CLUT segment */
349 66 *q++ = 0x0f; /* sync byte */
350 66 *q++ = 0x12; /* CLUT definition segment */
351 66 bytestream_put_be16(&q, page_id);
352 66 pseg_len = q;
353 66 q += 2; /* segment length */
354 66 *q++ = clut_id;
355 66 *q++ = (0 << 4) | 0xf; /* version = 0 */
356
357
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1122 for(i = 0; i < h->rects[clut_id]->nb_colors; i++) {
358 1056 *q++ = i; /* clut_entry_id */
359 1056 *q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
360 {
361 int a, r, g, b;
362 1056 uint32_t x= ((uint32_t*)h->rects[clut_id]->data[1])[i];
363 1056 a = (x >> 24) & 0xff;
364 1056 r = (x >> 16) & 0xff;
365 1056 g = (x >> 8) & 0xff;
366 1056 b = (x >> 0) & 0xff;
367
368 1056 *q++ = RGB_TO_Y_CCIR(r, g, b);
369 1056 *q++ = RGB_TO_V_CCIR(r, g, b, 0);
370 1056 *q++ = RGB_TO_U_CCIR(r, g, b, 0);
371 1056 *q++ = 255 - a;
372 }
373 }
374
375 66 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
376 66 buf_size -= 6 + h->rects[clut_id]->nb_colors * 6;
377 }
378
379
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36 if (buf_size < h->num_rects * 22)
380 return AVERROR_BUFFER_TOO_SMALL;
381
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102 for (region_id = 0; region_id < h->num_rects; region_id++) {
382
383 /* region composition segment */
384
385
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66 if (h->rects[region_id]->nb_colors <= 4) {
386 /* 2 bpp, some decoders do not support it correctly */
387 bpp_index = 0;
388
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66 } else if (h->rects[region_id]->nb_colors <= 16) {
389 /* 4 bpp, standard encoding */
390 66 bpp_index = 1;
391 } else if (h->rects[region_id]->nb_colors <= 256) {
392 /* 8 bpp, standard encoding */
393 bpp_index = 2;
394 } else {
395 return AVERROR(EINVAL);
396 }
397
398 66 *q++ = 0x0f; /* sync_byte */
399 66 *q++ = 0x11; /* segment_type */
400 66 bytestream_put_be16(&q, page_id);
401 66 pseg_len = q;
402 66 q += 2; /* segment length */
403 66 *q++ = region_id;
404 66 *q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
405 66 bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */
406 66 bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */
407 66 *q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
408 66 *q++ = region_id; /* clut_id == region_id */
409 66 *q++ = 0; /* 8 bit fill colors */
410 66 *q++ = 0x03; /* 4 bit and 2 bit fill colors */
411
412 66 bytestream_put_be16(&q, region_id); /* object_id == region_id */
413 66 *q++ = (0 << 6) | (0 << 4);
414 66 *q++ = 0;
415 66 *q++ = 0xf0;
416 66 *q++ = 0;
417
418 66 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
419 }
420 36 buf_size -= h->num_rects * 22;
421
422
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102 for (object_id = 0; object_id < h->num_rects; object_id++) {
423 int (*dvb_encode_rle)(uint8_t **pq, int buf_size,
424 const uint8_t *bitmap, int linesize,
425 int w, int h);
426
427
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66 if (buf_size < 13)
428 return AVERROR_BUFFER_TOO_SMALL;
429
430 /* bpp_index maths */
431
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66 if (h->rects[object_id]->nb_colors <= 4) {
432 /* 2 bpp, some decoders do not support it correctly */
433 dvb_encode_rle = dvb_encode_rle2;
434
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66 } else if (h->rects[object_id]->nb_colors <= 16) {
435 /* 4 bpp, standard encoding */
436 66 dvb_encode_rle = dvb_encode_rle4;
437 } else if (h->rects[object_id]->nb_colors <= 256) {
438 /* 8 bpp, standard encoding */
439 dvb_encode_rle = dvb_encode_rle8;
440 } else {
441 return AVERROR(EINVAL);
442 }
443
444 /* Object Data segment */
445 66 *q++ = 0x0f; /* sync byte */
446 66 *q++ = 0x13;
447 66 bytestream_put_be16(&q, page_id);
448 66 pseg_len = q;
449 66 q += 2; /* segment length */
450
451 66 bytestream_put_be16(&q, object_id);
452 66 *q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
453 object_coding_method,
454 non_modifying_color_flag */
455 {
456 uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
457 int ret;
458
459 66 ptop_field_len = q;
460 66 q += 2;
461 66 pbottom_field_len = q;
462 66 q += 2;
463 66 buf_size -= 13;
464
465 66 top_ptr = q;
466 66 ret = dvb_encode_rle(&q, buf_size,
467 66 h->rects[object_id]->data[0],
468 66 h->rects[object_id]->w * 2,
469 66 h->rects[object_id]->w,
470 66 h->rects[object_id]->h >> 1);
471
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66 if (ret < 0)
472 return ret;
473 66 buf_size -= ret;
474 66 bottom_ptr = q;
475 66 ret = dvb_encode_rle(&q, buf_size,
476 66 h->rects[object_id]->data[0] + h->rects[object_id]->w,
477 66 h->rects[object_id]->w * 2,
478 66 h->rects[object_id]->w,
479 66 h->rects[object_id]->h >> 1);
480
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66 if (ret < 0)
481 return ret;
482 66 buf_size -= ret;
483
484 66 bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
485 66 bytestream_put_be16(&pbottom_field_len, q - bottom_ptr);
486 }
487
488 66 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
489 }
490 }
491
492 /* end of display set segment */
493
494
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72 if (buf_size < 6)
495 return AVERROR_BUFFER_TOO_SMALL;
496 72 *q++ = 0x0f; /* sync_byte */
497 72 *q++ = 0x80; /* segment_type */
498 72 bytestream_put_be16(&q, page_id);
499 72 pseg_len = q;
500 72 q += 2; /* segment length */
501
502 72 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
503 72 buf_size -= 6;
504
505 72 s->object_version = (s->object_version + 1) & 0xf;
506 72 return q - outbuf;
507 }
508
509 const FFCodec ff_dvbsub_encoder = {
510 .p.name = "dvbsub",
511 CODEC_LONG_NAME("DVB subtitles"),
512 .p.type = AVMEDIA_TYPE_SUBTITLE,
513 .p.id = AV_CODEC_ID_DVB_SUBTITLE,
514 .priv_data_size = sizeof(DVBSubtitleContext),
515 FF_CODEC_ENCODE_SUB_CB(dvbsub_encode),
516 };
517