FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/dvdsubdec.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 253 432 58.6%
Branches: 130 266 48.9%

Line Branch Exec Source
1 /*
2 * DVD subtitle decoding
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
22 #include "avcodec.h"
23 #include "codec_internal.h"
24 #include "get_bits.h"
25 #include "internal.h"
26
27 #include "libavutil/attributes.h"
28 #include "libavutil/colorspace.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/bswap.h"
32
33 typedef struct DVDSubContext
34 {
35 AVClass *class;
36 uint32_t palette[16];
37 char *palette_str;
38 char *ifo_str;
39 int has_palette;
40 uint8_t colormap[4];
41 uint8_t alpha[256];
42 uint8_t buf[0x10000];
43 int buf_size;
44 int forced_subs_only;
45 uint8_t used_color[256];
46 } DVDSubContext;
47
48 static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
49 {
50 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
51 uint8_t r, g, b;
52 int i, y, cb, cr;
53 int r_add, g_add, b_add;
54
55 for (i = num_values; i > 0; i--) {
56 y = *ycbcr++;
57 cr = *ycbcr++;
58 cb = *ycbcr++;
59 YUV_TO_RGB1_CCIR(cb, cr);
60 YUV_TO_RGB2_CCIR(r, g, b, y);
61 *rgba++ = ((unsigned)*alpha++ << 24) | (r << 16) | (g << 8) | b;
62 }
63 }
64
65 296727 static int decode_run_2bit(GetBitContext *gb, int *color)
66 {
67 unsigned int v, t;
68
69 296727 v = 0;
70
4/4
✓ Branch 0 taken 536316 times.
✓ Branch 1 taken 255145 times.
✓ Branch 2 taken 494734 times.
✓ Branch 3 taken 41582 times.
791461 for (t = 1; v < t && t <= 0x40; t <<= 2)
71 494734 v = (v << 4) | get_bits(gb, 4);
72 296727 *color = v & 3;
73
2/2
✓ Branch 0 taken 41582 times.
✓ Branch 1 taken 255145 times.
296727 if (v < 4) { /* Code for fill rest of line */
74 41582 return INT_MAX;
75 }
76 255145 return v >> 2;
77 }
78
79 static int decode_run_8bit(GetBitContext *gb, int *color)
80 {
81 int len;
82 int has_run = get_bits1(gb);
83 *color = get_bits(gb, 2 + 6*get_bits1(gb));
84 if (has_run) {
85 if (get_bits1(gb)) {
86 len = get_bits(gb, 7);
87 if (len == 0)
88 len = INT_MAX;
89 else
90 len += 9;
91 } else
92 len = get_bits(gb, 3) + 2;
93 } else
94 len = 1;
95 return len;
96 }
97
98 174 static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256],
99 const uint8_t *buf, int start, int buf_size, int is_8bit)
100 {
101 GetBitContext gb;
102 int bit_len;
103 int x, y, len, color;
104 uint8_t *d;
105
106
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 174 times.
174 if (start >= buf_size)
107 return -1;
108
109
2/4
✓ Branch 0 taken 174 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 174 times.
174 if (w <= 0 || h <= 0)
110 return -1;
111
112 174 bit_len = (buf_size - start) * 8;
113 174 init_get_bits(&gb, buf + start, bit_len);
114
115 174 x = 0;
116 174 y = 0;
117 174 d = bitmap;
118 for(;;) {
119
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 296727 times.
296727 if (get_bits_count(&gb) > bit_len)
120 return -1;
121
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 296727 times.
296727 if (is_8bit)
122 len = decode_run_8bit(&gb, &color);
123 else
124 296727 len = decode_run_2bit(&gb, &color);
125
3/4
✓ Branch 0 taken 255145 times.
✓ Branch 1 taken 41582 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 255145 times.
296727 if (len != INT_MAX && len > w - x)
126 return AVERROR_INVALIDDATA;
127 296727 len = FFMIN(len, w - x);
128 296727 memset(d + x, color, len);
129 296727 used_color[color] = 1;
130 296727 x += len;
131
2/2
✓ Branch 0 taken 41582 times.
✓ Branch 1 taken 255145 times.
296727 if (x >= w) {
132 41582 y++;
133
2/2
✓ Branch 0 taken 174 times.
✓ Branch 1 taken 41408 times.
41582 if (y >= h)
134 174 break;
135 41408 d += linesize;
136 41408 x = 0;
137 /* byte align */
138 41408 align_get_bits(&gb);
139 }
140 }
141 174 return 0;
142 }
143
144 87 static void guess_palette(DVDSubContext* ctx,
145 uint32_t *rgba_palette,
146 uint32_t subtitle_color)
147 {
148 static const uint8_t level_map[4][4] = {
149 // this configuration (full range, lowest to highest) in tests
150 // seemed most common, so assume this
151 {0xff},
152 {0x00, 0xff},
153 {0x00, 0x80, 0xff},
154 {0x00, 0x55, 0xaa, 0xff},
155 };
156 87 uint8_t color_used[16] = { 0 };
157 int nb_opaque_colors, i, level, j, r, g, b;
158 87 uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
159
160
1/2
✓ Branch 0 taken 87 times.
✗ Branch 1 not taken.
87 if(ctx->has_palette) {
161
2/2
✓ Branch 0 taken 348 times.
✓ Branch 1 taken 87 times.
435 for(i = 0; i < 4; i++)
162 348 rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
163 348 | ((alpha[i] * 17U) << 24);
164 87 return;
165 }
166
167 for(i = 0; i < 4; i++)
168 rgba_palette[i] = 0;
169
170 nb_opaque_colors = 0;
171 for(i = 0; i < 4; i++) {
172 if (alpha[i] != 0 && !color_used[colormap[i]]) {
173 color_used[colormap[i]] = 1;
174 nb_opaque_colors++;
175 }
176 }
177
178 if (nb_opaque_colors == 0)
179 return;
180
181 j = 0;
182 memset(color_used, 0, 16);
183 for(i = 0; i < 4; i++) {
184 if (alpha[i] != 0) {
185 if (!color_used[colormap[i]]) {
186 level = level_map[nb_opaque_colors - 1][j];
187 r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
188 g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
189 b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
190 rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17U) << 24);
191 color_used[colormap[i]] = (i + 1);
192 j++;
193 } else {
194 rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
195 ((alpha[i] * 17U) << 24);
196 }
197 }
198 }
199 }
200
201 87 static void reset_rects(AVSubtitle *sub_header)
202 {
203 int i;
204
205
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (sub_header->rects) {
206 for (i = 0; i < sub_header->num_rects; i++) {
207 av_freep(&sub_header->rects[i]->data[0]);
208 av_freep(&sub_header->rects[i]->data[1]);
209 av_freep(&sub_header->rects[i]);
210 }
211 av_freep(&sub_header->rects);
212 sub_header->num_rects = 0;
213 }
214 87 }
215
216 #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
217
218 93 static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
219 const uint8_t *buf, int buf_size)
220 {
221 int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;
222 93 int big_offsets, offset_size, is_8bit = 0;
223 93 const uint8_t *yuv_palette = NULL;
224 93 uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
225 int date;
226 int i;
227 93 int is_menu = 0;
228 uint32_t size;
229 int64_t offset1, offset2;
230
231
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 93 times.
93 if (buf_size < 10)
232 return -1;
233
234
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 93 times.
93 if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
235 big_offsets = 1;
236 offset_size = 4;
237 cmd_pos = 6;
238 } else {
239 93 big_offsets = 0;
240 93 offset_size = 2;
241 93 cmd_pos = 2;
242 }
243
244
2/6
✗ Branch 0 not taken.
✓ Branch 1 taken 93 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✓ Branch 5 taken 93 times.
93 size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
245
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 93 times.
93 cmd_pos = READ_OFFSET(buf + cmd_pos);
246
247
3/4
✓ Branch 0 taken 93 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 6 times.
✓ Branch 3 taken 87 times.
93 if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {
248
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 6 times.
6 if (cmd_pos > size) {
249 av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");
250 return 0;
251 }
252 6 return AVERROR(EAGAIN);
253 }
254
255
2/4
✓ Branch 0 taken 173 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 173 times.
✗ Branch 3 not taken.
173 while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
256 173 date = AV_RB16(buf + cmd_pos);
257
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 173 times.
173 next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
258 ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
259 cmd_pos, next_cmd_pos, date);
260 173 pos = cmd_pos + 2 + offset_size;
261 173 offset1 = -1;
262 173 offset2 = -1;
263 173 x1 = y1 = x2 = y2 = 0;
264
1/2
✓ Branch 0 taken 694 times.
✗ Branch 1 not taken.
694 while (pos < buf_size) {
265 694 cmd = buf[pos++];
266 ff_dlog(NULL, "cmd=%02x\n", cmd);
267
7/12
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
✓ Branch 2 taken 86 times.
✓ Branch 3 taken 87 times.
✓ Branch 4 taken 87 times.
✓ Branch 5 taken 87 times.
✓ Branch 6 taken 87 times.
✗ Branch 7 not taken.
✗ Branch 8 not taken.
✗ Branch 9 not taken.
✓ Branch 10 taken 173 times.
✗ Branch 11 not taken.
694 switch(cmd) {
268 case 0x00:
269 /* menu subpicture */
270 is_menu = 1;
271 break;
272 87 case 0x01:
273 /* set start date */
274 87 sub_header->start_display_time = (date << 10) / 90;
275 87 break;
276 86 case 0x02:
277 /* set end date */
278 86 sub_header->end_display_time = (date << 10) / 90;
279 86 break;
280 87 case 0x03:
281 /* set colormap */
282
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if ((buf_size - pos) < 2)
283 goto fail;
284 87 colormap[3] = buf[pos] >> 4;
285 87 colormap[2] = buf[pos] & 0x0f;
286 87 colormap[1] = buf[pos + 1] >> 4;
287 87 colormap[0] = buf[pos + 1] & 0x0f;
288 87 pos += 2;
289 87 break;
290 87 case 0x04:
291 /* set alpha */
292
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if ((buf_size - pos) < 2)
293 goto fail;
294 87 alpha[3] = buf[pos] >> 4;
295 87 alpha[2] = buf[pos] & 0x0f;
296 87 alpha[1] = buf[pos + 1] >> 4;
297 87 alpha[0] = buf[pos + 1] & 0x0f;
298 87 pos += 2;
299 ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
300 87 break;
301 87 case 0x05:
302 case 0x85:
303
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if ((buf_size - pos) < 6)
304 goto fail;
305 87 x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
306 87 x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
307 87 y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
308 87 y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
309
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (cmd & 0x80)
310 is_8bit = 1;
311 ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
312 87 pos += 6;
313 87 break;
314 87 case 0x06:
315
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if ((buf_size - pos) < 4)
316 goto fail;
317 87 offset1 = AV_RB16(buf + pos);
318 87 offset2 = AV_RB16(buf + pos + 2);
319 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
320 87 pos += 4;
321 87 break;
322 case 0x86:
323 if ((buf_size - pos) < 8)
324 goto fail;
325 offset1 = AV_RB32(buf + pos);
326 offset2 = AV_RB32(buf + pos + 4);
327 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
328 pos += 8;
329 break;
330
331 case 0x83:
332 /* HD set palette */
333 if ((buf_size - pos) < 768)
334 goto fail;
335 yuv_palette = buf + pos;
336 pos += 768;
337 break;
338 case 0x84:
339 /* HD set contrast (alpha) */
340 if ((buf_size - pos) < 256)
341 goto fail;
342 for (i = 0; i < 256; i++)
343 alpha[i] = 0xFF - buf[pos+i];
344 pos += 256;
345 break;
346
347 173 case 0xff:
348 173 goto the_end;
349 default:
350 ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
351 goto the_end;
352 }
353 }
354 the_end:
355
2/4
✓ Branch 0 taken 173 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 173 times.
173 if (offset1 >= buf_size || offset2 >= buf_size)
356 goto fail;
357
358
3/4
✓ Branch 0 taken 87 times.
✓ Branch 1 taken 86 times.
✓ Branch 2 taken 87 times.
✗ Branch 3 not taken.
173 if (offset1 >= 0 && offset2 >= 0) {
359 int w, h;
360 uint8_t *bitmap;
361
362 /* decode the bitmap */
363 87 w = x2 - x1 + 1;
364
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (w < 0)
365 w = 0;
366 87 h = y2 - y1 + 1;
367
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (h < 0)
368 h = 0;
369
2/4
✓ Branch 0 taken 87 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 87 times.
✗ Branch 3 not taken.
87 if (w > 0 && h > 1) {
370 87 reset_rects(sub_header);
371 87 memset(ctx->used_color, 0, sizeof(ctx->used_color));
372 87 sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
373
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (!sub_header->rects)
374 goto fail;
375 87 sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
376
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (!sub_header->rects[0])
377 goto fail;
378 87 sub_header->num_rects = 1;
379 87 bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);
380
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (!bitmap)
381 goto fail;
382
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 87 times.
87 if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, ctx->used_color,
383 buf, offset1, buf_size, is_8bit) < 0)
384 goto fail;
385
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 87 times.
87 if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color,
386 buf, offset2, buf_size, is_8bit) < 0)
387 goto fail;
388 87 sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
389
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (!sub_header->rects[0]->data[1])
390 goto fail;
391
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (is_8bit) {
392 if (!yuv_palette)
393 goto fail;
394 sub_header->rects[0]->nb_colors = 256;
395 yuv_a_to_rgba(yuv_palette, alpha,
396 (uint32_t *)sub_header->rects[0]->data[1],
397 256);
398 } else {
399 87 sub_header->rects[0]->nb_colors = 4;
400 87 guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],
401 0xffffff);
402 }
403 87 sub_header->rects[0]->x = x1;
404 87 sub_header->rects[0]->y = y1;
405 87 sub_header->rects[0]->w = w;
406 87 sub_header->rects[0]->h = h;
407 87 sub_header->rects[0]->type = SUBTITLE_BITMAP;
408 87 sub_header->rects[0]->linesize[0] = w;
409 87 sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
410 }
411 }
412
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 173 times.
173 if (next_cmd_pos < cmd_pos) {
413 av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");
414 break;
415 }
416
2/2
✓ Branch 0 taken 87 times.
✓ Branch 1 taken 86 times.
173 if (next_cmd_pos == cmd_pos)
417 87 break;
418 86 cmd_pos = next_cmd_pos;
419 }
420
1/2
✓ Branch 0 taken 87 times.
✗ Branch 1 not taken.
87 if (sub_header->num_rects > 0)
421 87 return is_menu;
422 fail:
423 reset_rects(sub_header);
424 return -1;
425 }
426
427 76353 static int is_transp(const uint8_t *buf, int pitch, int n,
428 const uint8_t *transp_color)
429 {
430 int i;
431
2/2
✓ Branch 0 taken 45739192 times.
✓ Branch 1 taken 76005 times.
45815197 for(i = 0; i < n; i++) {
432
2/2
✓ Branch 0 taken 348 times.
✓ Branch 1 taken 45738844 times.
45739192 if (!transp_color[*buf])
433 348 return 0;
434 45738844 buf += pitch;
435 }
436 76005 return 1;
437 }
438
439 /* return 0 if empty rectangle, 1 if non empty */
440 87 static int find_smallest_bounding_rectangle(DVDSubContext *ctx, AVSubtitle *s)
441 {
442 87 uint8_t transp_color[256] = { 0 };
443 int y1, y2, x1, x2, y, w, h, i;
444 uint8_t *bitmap;
445 87 int transparent = 1;
446
447
4/8
✓ Branch 0 taken 87 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 87 times.
✗ Branch 3 not taken.
✓ Branch 4 taken 87 times.
✗ Branch 5 not taken.
✗ Branch 6 not taken.
✓ Branch 7 taken 87 times.
87 if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
448 return 0;
449
450
2/2
✓ Branch 0 taken 348 times.
✓ Branch 1 taken 87 times.
435 for(i = 0; i < s->rects[0]->nb_colors; i++) {
451
2/2
✓ Branch 0 taken 174 times.
✓ Branch 1 taken 174 times.
348 if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0) {
452 174 transp_color[i] = 1;
453
1/2
✓ Branch 0 taken 174 times.
✗ Branch 1 not taken.
174 } else if (ctx->used_color[i])
454 174 transparent = 0;
455 }
456
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (transparent)
457 return 0;
458 87 y1 = 0;
459
3/4
✓ Branch 0 taken 31663 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 31576 times.
✓ Branch 3 taken 87 times.
63326 while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
460 31663 1, s->rects[0]->w, transp_color))
461 31576 y1++;
462
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (y1 == s->rects[0]->h) {
463 av_freep(&s->rects[0]->data[0]);
464 s->rects[0]->w = s->rects[0]->h = 0;
465 return 0;
466 }
467
468 87 y2 = s->rects[0]->h - 1;
469
3/4
✓ Branch 0 taken 6932 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 6845 times.
✓ Branch 3 taken 87 times.
13864 while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,
470 6932 s->rects[0]->w, transp_color))
471 6845 y2--;
472 87 x1 = 0;
473
3/4
✓ Branch 0 taken 18813 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 18726 times.
✓ Branch 3 taken 87 times.
37626 while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],
474 18813 s->rects[0]->h, transp_color))
475 18726 x1++;
476 87 x2 = s->rects[0]->w - 1;
477
3/4
✓ Branch 0 taken 18945 times.
✗ Branch 1 not taken.
✓ Branch 3 taken 18858 times.
✓ Branch 4 taken 87 times.
18945 while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,
478 transp_color))
479 18858 x2--;
480 87 w = x2 - x1 + 1;
481 87 h = y2 - y1 + 1;
482 87 bitmap = av_malloc(w * h);
483
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (!bitmap)
484 return 1;
485
2/2
✓ Branch 0 taken 3161 times.
✓ Branch 1 taken 87 times.
3248 for(y = 0; y < h; y++) {
486 3161 memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);
487 }
488 87 av_freep(&s->rects[0]->data[0]);
489 87 s->rects[0]->data[0] = bitmap;
490 87 s->rects[0]->linesize[0] = w;
491 87 s->rects[0]->w = w;
492 87 s->rects[0]->h = h;
493 87 s->rects[0]->x += x1;
494 87 s->rects[0]->y += y1;
495
496 87 return 1;
497 }
498
499 12 static int append_to_cached_buf(AVCodecContext *avctx,
500 const uint8_t *buf, int buf_size)
501 {
502 12 DVDSubContext *ctx = avctx->priv_data;
503
504
2/4
✓ Branch 0 taken 12 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 12 times.
12 av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf));
505
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 12 times.
12 if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) {
506 av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
507 "too large SPU packets aborted.\n");
508 ctx->buf_size = 0;
509 return AVERROR_INVALIDDATA;
510 }
511 12 memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
512 12 ctx->buf_size += buf_size;
513 12 return 0;
514 }
515
516 93 static int dvdsub_decode(AVCodecContext *avctx, AVSubtitle *sub,
517 int *data_size, const AVPacket *avpkt)
518 {
519 93 DVDSubContext *ctx = avctx->priv_data;
520 93 const uint8_t *buf = avpkt->data;
521 93 int buf_size = avpkt->size;
522 93 int appended = 0;
523 int is_menu;
524
525
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 87 times.
93 if (ctx->buf_size) {
526 6 int ret = append_to_cached_buf(avctx, buf, buf_size);
527
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 6 times.
6 if (ret < 0) {
528 *data_size = 0;
529 return ret;
530 }
531 6 buf = ctx->buf;
532 6 buf_size = ctx->buf_size;
533 6 appended = 1;
534 }
535
536 93 is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
537
2/2
✓ Branch 0 taken 6 times.
✓ Branch 1 taken 87 times.
93 if (is_menu == AVERROR(EAGAIN)) {
538 6 *data_size = 0;
539
1/2
✓ Branch 0 taken 6 times.
✗ Branch 1 not taken.
6 return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);
540 }
541
542
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
87 if (is_menu < 0) {
543 ctx->buf_size = 0;
544 no_subtitle:
545 reset_rects(sub);
546 *data_size = 0;
547
548 return buf_size;
549 }
550
2/4
✓ Branch 0 taken 87 times.
✗ Branch 1 not taken.
✗ Branch 3 not taken.
✓ Branch 4 taken 87 times.
87 if (!is_menu && find_smallest_bounding_rectangle(ctx, sub) == 0)
551 goto no_subtitle;
552
553
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 87 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
87 if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))
554 goto no_subtitle;
555
556 87 ctx->buf_size = 0;
557 87 *data_size = 1;
558 87 return buf_size;
559 }
560
561 static int parse_ifo_palette(DVDSubContext *ctx, char *p)
562 {
563 FILE *ifo;
564 char ifostr[12];
565 uint32_t sp_pgci, pgci, off_pgc, pgc;
566 uint8_t r, g, b, yuv[65], *buf;
567 int i, y, cb, cr, r_add, g_add, b_add;
568 int ret = 0;
569 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
570
571 ctx->has_palette = 0;
572 if ((ifo = avpriv_fopen_utf8(p, "r")) == NULL) {
573 av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));
574 return AVERROR_EOF;
575 }
576 if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
577 av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
578 ret = AVERROR_INVALIDDATA;
579 goto end;
580 }
581 if (fseek(ifo, 0xCC, SEEK_SET) == -1) {
582 ret = AVERROR(errno);
583 goto end;
584 }
585 if (fread(&sp_pgci, 4, 1, ifo) == 1) {
586 pgci = av_be2ne32(sp_pgci) * 2048;
587 if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {
588 ret = AVERROR(errno);
589 goto end;
590 }
591 if (fread(&off_pgc, 4, 1, ifo) == 1) {
592 pgc = pgci + av_be2ne32(off_pgc);
593 if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {
594 ret = AVERROR(errno);
595 goto end;
596 }
597 if (fread(yuv, 64, 1, ifo) == 1) {
598 buf = yuv;
599 for(i=0; i<16; i++) {
600 y = *++buf;
601 cr = *++buf;
602 cb = *++buf;
603 YUV_TO_RGB1_CCIR(cb, cr);
604 YUV_TO_RGB2_CCIR(r, g, b, y);
605 ctx->palette[i] = (r << 16) + (g << 8) + b;
606 buf++;
607 }
608 ctx->has_palette = 1;
609 }
610 }
611 }
612 if (ctx->has_palette == 0) {
613 av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
614 ret = AVERROR_INVALIDDATA;
615 }
616 end:
617 fclose(ifo);
618 return ret;
619 }
620
621 11 static int dvdsub_parse_extradata(AVCodecContext *avctx)
622 {
623 11 DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
624 char *dataorig, *data;
625 11 int ret = 1;
626
627
3/4
✓ Branch 0 taken 9 times.
✓ Branch 1 taken 2 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 9 times.
11 if (!avctx->extradata || !avctx->extradata_size)
628 2 return 1;
629
630 9 dataorig = data = av_malloc(avctx->extradata_size+1);
631
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 9 times.
9 if (!data)
632 return AVERROR(ENOMEM);
633 9 memcpy(data, avctx->extradata, avctx->extradata_size);
634 9 data[avctx->extradata_size] = '\0';
635
636 67 for(;;) {
637 76 int pos = strcspn(data, "\n\r");
638
3/4
✓ Branch 0 taken 9 times.
✓ Branch 1 taken 67 times.
✓ Branch 2 taken 9 times.
✗ Branch 3 not taken.
76 if (pos==0 && *data==0)
639 9 break;
640
641
2/2
✓ Branch 0 taken 9 times.
✓ Branch 1 taken 58 times.
67 if (strncmp("palette:", data, 8) == 0) {
642 9 ctx->has_palette = 1;
643 9 ff_dvdsub_parse_palette(ctx->palette, data + 8);
644
2/2
✓ Branch 0 taken 9 times.
✓ Branch 1 taken 49 times.
58 } else if (strncmp("size:", data, 5) == 0) {
645 int w, h;
646
1/2
✓ Branch 0 taken 9 times.
✗ Branch 1 not taken.
9 if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
647 9 ret = ff_set_dimensions(avctx, w, h);
648
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 9 times.
9 if (ret < 0)
649 goto fail;
650 }
651 }
652
653 67 data += pos;
654 67 data += strspn(data, "\n\r");
655 }
656
657 9 fail:
658 9 av_free(dataorig);
659 9 return ret;
660 }
661
662 11 static av_cold int dvdsub_init(AVCodecContext *avctx)
663 {
664 11 DVDSubContext *ctx = avctx->priv_data;
665 int ret;
666
667
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 11 times.
11 if ((ret = dvdsub_parse_extradata(avctx)) < 0)
668 return ret;
669
670
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
11 if (ctx->ifo_str)
671 parse_ifo_palette(ctx, ctx->ifo_str);
672
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 11 times.
11 if (ctx->palette_str) {
673 ctx->has_palette = 1;
674 ff_dvdsub_parse_palette(ctx->palette, ctx->palette_str);
675 }
676
2/2
✓ Branch 0 taken 9 times.
✓ Branch 1 taken 2 times.
11 if (ctx->has_palette) {
677 int i;
678 9 av_log(avctx, AV_LOG_DEBUG, "palette:");
679
2/2
✓ Branch 0 taken 144 times.
✓ Branch 1 taken 9 times.
153 for(i=0;i<16;i++)
680 144 av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]);
681 9 av_log(avctx, AV_LOG_DEBUG, "\n");
682 }
683
684 11 return 1;
685 }
686
687 static void dvdsub_flush(AVCodecContext *avctx)
688 {
689 DVDSubContext *ctx = avctx->priv_data;
690 ctx->buf_size = 0;
691 }
692
693 #define OFFSET(field) offsetof(DVDSubContext, field)
694 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
695 static const AVOption options[] = {
696 { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
697 { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
698 { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
699 { NULL }
700 };
701 static const AVClass dvdsub_class = {
702 .class_name = "dvdsubdec",
703 .item_name = av_default_item_name,
704 .option = options,
705 .version = LIBAVUTIL_VERSION_INT,
706 };
707
708 const FFCodec ff_dvdsub_decoder = {
709 .p.name = "dvdsub",
710 .p.long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
711 .p.type = AVMEDIA_TYPE_SUBTITLE,
712 .p.id = AV_CODEC_ID_DVD_SUBTITLE,
713 .priv_data_size = sizeof(DVDSubContext),
714 .init = dvdsub_init,
715 FF_CODEC_DECODE_SUB_CB(dvdsub_decode),
716 .flush = dvdsub_flush,
717 .p.priv_class = &dvdsub_class,
718 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
719 };
720