FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dvbsubenc.c
Date: 2026-10-29 23:19:09
Exec Total Coverage
Lines: 182 324 56.2%
Functions: 2 4 50.0%
Branches: 105 250 42.0%
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/avassert.h"
25 #include "libavutil/colorspace.h"
26 #include "libavutil/opt.h"
27
28 typedef struct DVBSubtitleContext {
29 AVClass * class;
30 int object_version;
31 int min_bpp;
32 } DVBSubtitleContext;
33
34 #define PUTBITS2(val)\
35 {\
36 bitbuf |= (val) << bitcnt;\
37 bitcnt -= 2;\
38 if (bitcnt < 0) {\
39 bitcnt = 6;\
40 *q++ = bitbuf;\
41 bitbuf = 0;\
42 }\
43 }
44
45 ✗ static int dvb_encode_rle2(uint8_t **pq, int buf_size,
46 const uint8_t *bitmap, int linesize,
47 int w, int h)
48 {
49 uint8_t *q, *line_begin;
50 unsigned int bitbuf;
51 int bitcnt;
52 int x, y, len, x1, v, color;
53
54 ✗ q = *pq;
55
56 ✗ for(y = 0; y < h; y++) {
57 // Worst case line is 3 bits per value + 4 bytes overhead
58 ✗ if (buf_size * 8LL < w * 3 + 32)
59 ✗ return AVERROR_BUFFER_TOO_SMALL;
60 ✗ line_begin = q;
61 ✗ *q++ = 0x10;
62 ✗ bitbuf = 0;
63 ✗ bitcnt = 6;
64
65 ✗ x = 0;
66 ✗ while (x < w) {
67 ✗ x1 = x;
68 ✗ color = bitmap[x1++];
69 ✗ while (x1 < w && bitmap[x1] == color)
70 ✗ x1++;
71 ✗ len = x1 - x;
72 ✗ if (color == 0 && len == 2) {
73 ✗ PUTBITS2(0);
74 ✗ PUTBITS2(0);
75 ✗ PUTBITS2(1);
76 ✗ } else if (len >= 3 && len <= 10) {
77 ✗ v = len - 3;
78 ✗ PUTBITS2(0);
79 ✗ PUTBITS2((v >> 2) | 2);
80 ✗ PUTBITS2(v & 3);
81 ✗ PUTBITS2(color);
82 ✗ } else if (len >= 12 && len <= 27) {
83 ✗ v = len - 12;
84 ✗ PUTBITS2(0);
85 ✗ PUTBITS2(0);
86 ✗ PUTBITS2(2);
87 ✗ PUTBITS2(v >> 2);
88 ✗ PUTBITS2(v & 3);
89 ✗ PUTBITS2(color);
90 ✗ } else if (len >= 29) {
91 /* length = 29 ... 284 */
92 ✗ if (len > 284)
93 ✗ len = 284;
94 ✗ v = len - 29;
95 ✗ PUTBITS2(0);
96 ✗ PUTBITS2(0);
97 ✗ PUTBITS2(3);
98 ✗ PUTBITS2((v >> 6));
99 ✗ PUTBITS2((v >> 4) & 3);
100 ✗ PUTBITS2((v >> 2) & 3);
101 ✗ PUTBITS2(v & 3);
102 ✗ PUTBITS2(color);
103 } else {
104 ✗ PUTBITS2(color);
105 ✗ if (color == 0) {
106 ✗ PUTBITS2(1);
107 }
108 ✗ len = 1;
109 }
110 ✗ x += len;
111 }
112 /* end of line */
113 ✗ PUTBITS2(0);
114 ✗ PUTBITS2(0);
115 ✗ PUTBITS2(0);
116 ✗ if (bitcnt != 6) {
117 ✗ *q++ = bitbuf;
118 }
119 ✗ *q++ = 0xf0;
120 ✗ bitmap += linesize;
121 ✗ buf_size -= q - line_begin;
122 }
123 ✗ len = q - *pq;
124 ✗ *pq = q;
125 ✗ return len;
126 }
127
128 #define PUTBITS4(val)\
129 {\
130 bitbuf |= (val) << bitcnt;\
131 bitcnt -= 4;\
132 if (bitcnt < 0) {\
133 bitcnt = 4;\
134 *q++ = bitbuf;\
135 bitbuf = 0;\
136 }\
137 }
138
139 /* some DVB decoders only implement 4 bits/pixel */
140 132 static int dvb_encode_rle4(uint8_t **pq, int buf_size,
141 const uint8_t *bitmap, int linesize,
142 int w, int h)
143 {
144 uint8_t *q, *line_begin;
145 unsigned int bitbuf;
146 int bitcnt;
147 int x, y, len, x1, v, color;
148
149 132 q = *pq;
150
151
2/2
✓ Branch 0 taken 2376 times.
✓ Branch 1 taken 132 times.
 2508 for(y = 0; y < h; y++) {
152 // Worst case line is 6 bits per value, + 4 bytes overhead
153
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2376 times.
 2376 if (buf_size * 8LL < w * 6 + 32)
154 ✗ return AVERROR_BUFFER_TOO_SMALL;
155 2376 line_begin = q;
156 2376 *q++ = 0x11;
157 2376 bitbuf = 0;
158 2376 bitcnt = 4;
159
160 2376 x = 0;
161
2/2
✓ Branch 0 taken 254154 times.
✓ Branch 1 taken 2376 times.
 256530 while (x < w) {
162 254154 x1 = x;
163 254154 color = bitmap[x1++];
164
4/4
✓ Branch 0 taken 1989019 times.
✓ Branch 1 taken 3492 times.
✓ Branch 2 taken 1738357 times.
✓ Branch 3 taken 250662 times.
 1992511 while (x1 < w && bitmap[x1] == color)
165 1738357 x1++;
166 254154 len = x1 - x;
167
3/4
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 248286 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 5868 times.
 254154 if (color == 0 && len == 2) {
168 ✗ PUTBITS4(0);
169 ✗ PUTBITS4(0xd);
170
5/6
✓ Branch 0 taken 5868 times.
✓ Branch 1 taken 248286 times.
✓ Branch 2 taken 5868 times.
✗ Branch 3 not taken.
✓ Branch 4 taken 36 times.
✓ Branch 5 taken 5832 times.
 254154 } else if (color == 0 && (len >= 3 && len <= 9)) {
171
2/2
✓ Branch 0 taken 18 times.
✓ Branch 1 taken 18 times.
 36 PUTBITS4(0);
172
2/2
✓ Branch 0 taken 18 times.
✓ Branch 1 taken 18 times.
 36 PUTBITS4(len - 2);
173
4/4
✓ Branch 0 taken 36714 times.
✓ Branch 1 taken 217404 times.
✓ Branch 2 taken 18199 times.
✓ Branch 3 taken 18515 times.
 254118 } else if (len >= 4 && len <= 7) {
174
2/2
✓ Branch 0 taken 9378 times.
✓ Branch 1 taken 8821 times.
 18199 PUTBITS4(0);
175
2/2
✓ Branch 0 taken 8821 times.
✓ Branch 1 taken 9378 times.
 18199 PUTBITS4(8 + len - 4);
176
2/2
✓ Branch 0 taken 9378 times.
✓ Branch 1 taken 8821 times.
 18199 PUTBITS4(color);
177
4/4
✓ Branch 0 taken 17158 times.
✓ Branch 1 taken 218761 times.
✓ Branch 2 taken 7926 times.
✓ Branch 3 taken 9232 times.
 235919 } else if (len >= 9 && len <= 24) {
178
2/2
✓ Branch 0 taken 4414 times.
✓ Branch 1 taken 3512 times.
 7926 PUTBITS4(0);
179
2/2
✓ Branch 0 taken 3512 times.
✓ Branch 1 taken 4414 times.
 7926 PUTBITS4(0xe);
180
2/2
✓ Branch 0 taken 4414 times.
✓ Branch 1 taken 3512 times.
 7926 PUTBITS4(len - 9);
181
2/2
✓ Branch 0 taken 3512 times.
✓ Branch 1 taken 4414 times.
 7926 PUTBITS4(color);
182
2/2
✓ Branch 0 taken 9232 times.
✓ Branch 1 taken 218761 times.
 227993 } else if (len >= 25) {
183
2/2
✓ Branch 0 taken 1469 times.
✓ Branch 1 taken 7763 times.
 9232 if (len > 280)
184 1469 len = 280;
185 9232 v = len - 25;
186
2/2
✓ Branch 0 taken 3950 times.
✓ Branch 1 taken 5282 times.
 9232 PUTBITS4(0);
187
2/2
✓ Branch 0 taken 5282 times.
✓ Branch 1 taken 3950 times.
 9232 PUTBITS4(0xf);
188
2/2
✓ Branch 0 taken 3950 times.
✓ Branch 1 taken 5282 times.
 9232 PUTBITS4(v >> 4);
189
2/2
✓ Branch 0 taken 5282 times.
✓ Branch 1 taken 3950 times.
 9232 PUTBITS4(v & 0xf);
190
2/2
✓ Branch 0 taken 3950 times.
✓ Branch 1 taken 5282 times.
 9232 PUTBITS4(color);
191 } else {
192
2/2
✓ Branch 0 taken 109256 times.
✓ Branch 1 taken 109505 times.
 218761 PUTBITS4(color);
193
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 218761 times.
 218761 if (color == 0) {
194 ✗ PUTBITS4(0xc);
195 }
196 218761 len = 1;
197 }
198 254154 x += len;
199 }
200 /* end of line */
201
2/2
✓ Branch 0 taken 1024 times.
✓ Branch 1 taken 1352 times.
 2376 PUTBITS4(0);
202
2/2
✓ Branch 0 taken 1352 times.
✓ Branch 1 taken 1024 times.
 2376 PUTBITS4(0);
203
2/2
✓ Branch 0 taken 1024 times.
✓ Branch 1 taken 1352 times.
 2376 if (bitcnt != 4) {
204 1024 *q++ = bitbuf;
205 }
206 2376 *q++ = 0xf0;
207 2376 bitmap += linesize;
208 2376 buf_size -= q - line_begin;
209 }
210 132 len = q - *pq;
211 132 *pq = q;
212 132 return len;
213 }
214
215 ✗ static int dvb_encode_rle8(uint8_t **pq, int buf_size,
216 const uint8_t *bitmap, int linesize,
217 int w, int h)
218 {
219 uint8_t *q, *line_begin;
220 int x, y, len, x1, color;
221
222 ✗ q = *pq;
223
224 ✗ for (y = 0; y < h; y++) {
225 // Worst case line is 12 bits per value, + 4 bytes overhead
226 ✗ if (buf_size * 8LL < w * 12 + 32)
227 ✗ return AVERROR_BUFFER_TOO_SMALL;
228 ✗ line_begin = q;
229 ✗ *q++ = 0x12;
230
231 ✗ x = 0;
232 ✗ while (x < w) {
233 ✗ x1 = x;
234 ✗ color = bitmap[x1++];
235 ✗ while (x1 < w && bitmap[x1] == color)
236 ✗ x1++;
237 ✗ len = x1 - x;
238 ✗ if (len == 1 && color) {
239 // 00000001 to 11111111 1 pixel in colour x
240 ✗ *q++ = color;
241 } else {
242 ✗ if (color == 0x00) {
243 // 00000000 0LLLLLLL L pixels (1-127) in colour 0 (L > 0)
244 ✗ len = FFMIN(len, 127);
245 ✗ *q++ = 0x00;
246 ✗ *q++ = len;
247 ✗ } else if (len > 2) {
248 // 00000000 1LLLLLLL CCCCCCCC L pixels (3-127) in colour C (L > 2)
249 ✗ len = FFMIN(len, 127);
250 ✗ *q++ = 0x00;
251 ✗ *q++ = 0x80+len;
252 ✗ *q++ = color;
253 }
254 ✗ else if (len == 2) {
255 ✗ *q++ = color;
256 ✗ *q++ = color;
257 } else {
258 ✗ *q++ = color;
259 ✗ len = 1;
260 }
261 }
262 ✗ x += len;
263 }
264 /* end of line */
265 // 00000000 00000000 end of 8-bit/pixel_code_string
266 ✗ *q++ = 0x00;
267 ✗ *q++ = 0x00;
268 ✗ *q++ = 0xf0;
269 ✗ bitmap += linesize;
270 ✗ buf_size -= q - line_begin;
271 }
272 ✗ len = q - *pq;
273 ✗ *pq = q;
274 ✗ return len;
275 }
276
277 72 static int dvbsub_encode(AVCodecContext *avctx, uint8_t *outbuf, int buf_size,
278 const AVSubtitle *h)
279 {
280 72 DVBSubtitleContext *s = avctx->priv_data;
281 uint8_t *q, *pseg_len;
282 int page_id, region_id, clut_id, object_id, i, bpp_index, page_state, min_colors;
283
284
285 72 q = outbuf;
286
287 72 page_id = 1;
288
289
1/2
✓ Branch 0 taken 72 times.
✗ Branch 1 not taken.
 72 switch(s->min_bpp) {
290 72 case 2:
291 case 4:
292 case 8:
293 72 min_colors = 1 << s->min_bpp;
294 72 break;
295 ✗ default:
296 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid min_bpp value %d.\n", s->min_bpp);
297 ✗ return AVERROR(EINVAL);
298 }
299
300
3/4
✓ Branch 0 taken 36 times.
✓ Branch 1 taken 36 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 36 times.
 72 if (h->num_rects && !h->rects)
301 ✗ return AVERROR(EINVAL);
302
303
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 72 times.
 72 if (h->num_rects >= 256)
304 ✗ return AVERROR(EINVAL);
305
306
2/2
✓ Branch 0 taken 66 times.
✓ Branch 1 taken 72 times.
 138 for (i = 0; i < h->num_rects; i++) {
307
4/8
✓ Branch 0 taken 66 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 66 times.
✗ Branch 3 not taken.
✓ Branch 4 taken 66 times.
✗ Branch 5 not taken.
✗ Branch 6 not taken.
✓ Branch 7 taken 66 times.
 66 av_assert0(h->rects[i]->w >= 0 && h->rects[i]->h >= 0 &&
308 h->rects[i]->nb_colors >= 0 && h->rects[i]->nb_colors <= 256);
309
2/4
✓ Branch 0 taken 66 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 66 times.
 66 if (h->rects[i]->w > 0xFFFF || h->rects[i]->h > 0xFFFF)
310 ✗ return AVERROR(EINVAL);
311 }
312
313
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 72 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 72 if (avctx->width > 0 && avctx->height > 0) {
314 ✗ if (buf_size < 11)
315 ✗ return AVERROR_BUFFER_TOO_SMALL;
316 /* display definition segment */
317 ✗ *q++ = 0x0f; /* sync_byte */
318 ✗ *q++ = 0x14; /* segment_type */
319 ✗ bytestream_put_be16(&q, page_id);
320 ✗ pseg_len = q;
321 ✗ q += 2; /* segment length */
322 ✗ *q++ = 0x00; /* dds version number & display window flag */
323 ✗ bytestream_put_be16(&q, avctx->width - 1); /* display width */
324 ✗ bytestream_put_be16(&q, avctx->height - 1); /* display height */
325 ✗ bytestream_put_be16(&pseg_len, q - pseg_len - 2);
326 ✗ buf_size -= 11;
327 }
328
329 /* page composition segment */
330
331
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 72 times.
 72 if (buf_size < 8 + h->num_rects * 6)
332 ✗ return AVERROR_BUFFER_TOO_SMALL;
333 72 *q++ = 0x0f; /* sync_byte */
334 72 *q++ = 0x10; /* segment_type */
335 72 bytestream_put_be16(&q, page_id);
336 72 pseg_len = q;
337 72 q += 2; /* segment length */
338 72 *q++ = 30; /* page_timeout (seconds) */
339 72 page_state = 2; /* mode change */
340 /* page_version = 0 + page_state */
341 72 *q++ = (s->object_version << 4) | (page_state << 2) | 3;
342
343
2/2
✓ Branch 0 taken 66 times.
✓ Branch 1 taken 72 times.
 138 for (region_id = 0; region_id < h->num_rects; region_id++) {
344 66 *q++ = region_id;
345 66 *q++ = 0xff; /* reserved */
346 66 bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */
347 66 bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */
348 }
349
350 72 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
351 72 buf_size -= 8 + h->num_rects * 6;
352
353
2/2
✓ Branch 0 taken 36 times.
✓ Branch 1 taken 36 times.
 72 if (h->num_rects) {
354
2/2
✓ Branch 0 taken 66 times.
✓ Branch 1 taken 36 times.
 102 for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
355 /* CLUT segment */
356 66 int nb_colors = FFMAX(min_colors, h->rects[clut_id]->nb_colors);
357
358
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (nb_colors <= 4U) {
359 /* 2 bpp, some decoders do not support it correctly */
360 ✗ bpp_index = 0;
361
1/2
✓ Branch 0 taken 66 times.
✗ Branch 1 not taken.
 66 } else if (nb_colors <= 16U) {
362 /* 4 bpp, standard encoding */
363 66 bpp_index = 1;
364 ✗ } else if (nb_colors <= 256U) {
365 /* 8 bpp, standard encoding */
366 ✗ bpp_index = 2;
367 } else {
368 ✗ return AVERROR(EINVAL);
369 }
370
371
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (buf_size < 8 + h->rects[clut_id]->nb_colors * 6)
372 ✗ return AVERROR_BUFFER_TOO_SMALL;
373
374 /* CLUT segment */
375 66 *q++ = 0x0f; /* sync byte */
376 66 *q++ = 0x12; /* CLUT definition segment */
377 66 bytestream_put_be16(&q, page_id);
378 66 pseg_len = q;
379 66 q += 2; /* segment length */
380 66 *q++ = clut_id;
381 66 *q++ = (0 << 4) | 0xf; /* version = 0 */
382
383
2/2
✓ Branch 0 taken 1056 times.
✓ Branch 1 taken 66 times.
 1122 for(i = 0; i < h->rects[clut_id]->nb_colors; i++) {
384 1056 *q++ = i; /* clut_entry_id */
385 1056 *q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
386 {
387 int a, r, g, b;
388 1056 uint32_t x= ((uint32_t*)h->rects[clut_id]->data[1])[i];
389 1056 a = (x >> 24) & 0xff;
390 1056 r = (x >> 16) & 0xff;
391 1056 g = (x >> 8) & 0xff;
392 1056 b = (x >> 0) & 0xff;
393
394 1056 *q++ = RGB_TO_Y_CCIR(r, g, b);
395 1056 *q++ = RGB_TO_V_CCIR(r, g, b, 0);
396 1056 *q++ = RGB_TO_U_CCIR(r, g, b, 0);
397 1056 *q++ = 255 - a;
398 }
399 }
400
401 66 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
402 66 buf_size -= 8 + h->rects[clut_id]->nb_colors * 6;
403 }
404
405
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 36 times.
 36 if (buf_size < h->num_rects * 22)
406 ✗ return AVERROR_BUFFER_TOO_SMALL;
407
2/2
✓ Branch 0 taken 66 times.
✓ Branch 1 taken 36 times.
 102 for (region_id = 0; region_id < h->num_rects; region_id++) {
408
409 /* region composition segment */
410 66 int nb_colors = FFMAX(min_colors, h->rects[region_id]->nb_colors);
411
412
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (nb_colors <= 4) {
413 /* 2 bpp, some decoders do not support it correctly */
414 ✗ bpp_index = 0;
415
1/2
✓ Branch 0 taken 66 times.
✗ Branch 1 not taken.
 66 } else if (nb_colors <= 16) {
416 /* 4 bpp, standard encoding */
417 66 bpp_index = 1;
418 ✗ } else if (nb_colors <= 256) {
419 /* 8 bpp, standard encoding */
420 ✗ bpp_index = 2;
421 } else {
422 ✗ return AVERROR(EINVAL);
423 }
424
425 66 *q++ = 0x0f; /* sync_byte */
426 66 *q++ = 0x11; /* segment_type */
427 66 bytestream_put_be16(&q, page_id);
428 66 pseg_len = q;
429 66 q += 2; /* segment length */
430 66 *q++ = region_id;
431 66 *q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
432 66 bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */
433 66 bytestream_put_be16(&q, h->rects[region_id]->h); /* region height */
434 66 *q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
435 66 *q++ = region_id; /* clut_id == region_id */
436 66 *q++ = 0; /* 8 bit fill colors */
437 66 *q++ = 0x03; /* 4 bit and 2 bit fill colors */
438
439 66 bytestream_put_be16(&q, region_id); /* object_id == region_id */
440 66 *q++ = (0 << 6) | (0 << 4);
441 66 *q++ = 0;
442 66 *q++ = 0xf0;
443 66 *q++ = 0;
444
445 66 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
446 }
447 36 buf_size -= h->num_rects * 22;
448
449
2/2
✓ Branch 0 taken 66 times.
✓ Branch 1 taken 36 times.
 102 for (object_id = 0; object_id < h->num_rects; object_id++) {
450 int (*dvb_encode_rle)(uint8_t **pq, int buf_size,
451 const uint8_t *bitmap, int linesize,
452 int w, int h);
453
454 66 int nb_colors = FFMAX(min_colors, h->rects[object_id]->nb_colors);
455
456
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (buf_size < 13)
457 ✗ return AVERROR_BUFFER_TOO_SMALL;
458
459 /* bpp_index maths */
460
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (nb_colors <= 4) {
461 /* 2 bpp, some decoders do not support it correctly */
462 ✗ dvb_encode_rle = dvb_encode_rle2;
463
1/2
✓ Branch 0 taken 66 times.
✗ Branch 1 not taken.
 66 } else if (nb_colors <= 16) {
464 /* 4 bpp, standard encoding */
465 66 dvb_encode_rle = dvb_encode_rle4;
466 ✗ } else if (nb_colors <= 256) {
467 /* 8 bpp, standard encoding */
468 ✗ dvb_encode_rle = dvb_encode_rle8;
469 } else {
470 ✗ return AVERROR(EINVAL);
471 }
472
473 /* Object Data segment */
474 66 *q++ = 0x0f; /* sync byte */
475 66 *q++ = 0x13;
476 66 bytestream_put_be16(&q, page_id);
477 66 pseg_len = q;
478 66 q += 2; /* segment length */
479
480 66 bytestream_put_be16(&q, object_id);
481 66 *q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
482 object_coding_method,
483 non_modifying_color_flag */
484 {
485 uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
486 int ret;
487
488 66 ptop_field_len = q;
489 66 q += 2;
490 66 pbottom_field_len = q;
491 66 q += 2;
492 66 buf_size -= 13;
493
494 66 top_ptr = q;
495 66 ret = dvb_encode_rle(&q, buf_size,
496 66 h->rects[object_id]->data[0],
497 66 h->rects[object_id]->w * 2,
498 66 h->rects[object_id]->w,
499 66 h->rects[object_id]->h >> 1);
500
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (ret < 0)
501 ✗ return ret;
502 66 buf_size -= ret;
503 66 bottom_ptr = q;
504 66 ret = dvb_encode_rle(&q, buf_size,
505 66 h->rects[object_id]->data[0] + h->rects[object_id]->w,
506 66 h->rects[object_id]->w * 2,
507 66 h->rects[object_id]->w,
508 66 h->rects[object_id]->h >> 1);
509
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 66 times.
 66 if (ret < 0)
510 ✗ return ret;
511 66 buf_size -= ret;
512
513 66 bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr);
514 66 bytestream_put_be16(&pbottom_field_len, q - bottom_ptr);
515 }
516
517 66 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
518 }
519 }
520
521 /* end of display set segment */
522
523
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 72 times.
 72 if (buf_size < 6)
524 ✗ return AVERROR_BUFFER_TOO_SMALL;
525 72 *q++ = 0x0f; /* sync_byte */
526 72 *q++ = 0x80; /* segment_type */
527 72 bytestream_put_be16(&q, page_id);
528 72 pseg_len = q;
529 72 q += 2; /* segment length */
530
531 72 bytestream_put_be16(&pseg_len, q - pseg_len - 2);
532 72 buf_size -= 6;
533
534 72 s->object_version = (s->object_version + 1) & 0xf;
535 72 return q - outbuf;
536 }
537
538 #define OFFSET(x) offsetof(DVBSubtitleContext, x)
539 #define SE AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_ENCODING_PARAM
540 static const AVOption options[] = {
541 {"min_bpp", "minimum bits-per-pixel for subtitle colors (2, 4 or 8)", OFFSET(min_bpp), AV_OPT_TYPE_INT, {.i64 = 4}, 2, 8, SE},
542 { NULL },
543 };
544
545 static const AVClass dvbsubenc_class = {
546 .class_name = "DVBSUB subtitle encoder",
547 .item_name = av_default_item_name,
548 .option = options,
549 .version = LIBAVUTIL_VERSION_INT,
550 };
551
552 const FFCodec ff_dvbsub_encoder = {
553 .p.name = "dvbsub",
554 CODEC_LONG_NAME("DVB subtitles"),
555 .p.type = AVMEDIA_TYPE_SUBTITLE,
556 .p.id = AV_CODEC_ID_DVB_SUBTITLE,
557 .priv_data_size = sizeof(DVBSubtitleContext),
558 FF_CODEC_ENCODE_SUB_CB(dvbsub_encode),
559 .p.priv_class = &dvbsubenc_class,
560 };
561