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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 "get_bits.h" | |
24 | #include "internal.h" | |
25 | ||
26 | #include "libavutil/attributes.h" | |
27 | #include "libavutil/colorspace.h" | |
28 | #include "libavutil/opt.h" | |
29 | #include "libavutil/imgutils.h" | |
30 | #include "libavutil/avstring.h" | |
31 | ||
32 | typedef struct DVDSubContext | |
33 | { | |
34 | AVClass *class; | |
35 | uint32_t palette[16]; | |
36 | char *palette_str; | |
37 | int has_palette; | |
38 | uint8_t colormap[4]; | |
39 | uint8_t alpha[256]; | |
40 | uint8_t *buf; | |
41 | int buf_size; | |
42 | #ifdef DEBUG | |
43 | int sub_id; | |
44 | #endif | |
45 | } DVDSubContext; | |
46 | ||
47 | static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values) | |
48 | { | |
49 | const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; | |
50 | uint8_t r, g, b; | |
51 | int i, y, cb, cr; | |
52 | int r_add, g_add, b_add; | |
53 | ||
54 | for (i = num_values; i > 0; i--) { | |
55 | y = *ycbcr++; | |
56 | cr = *ycbcr++; | |
57 | cb = *ycbcr++; | |
58 | YUV_TO_RGB1_CCIR(cb, cr); | |
59 | YUV_TO_RGB2_CCIR(r, g, b, y); | |
60 | *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b; | |
61 | } | |
62 | } | |
63 | ||
64 | static int decode_run_2bit(GetBitContext *gb, int *color) | |
65 | { | |
66 | unsigned int v, t; | |
67 | ||
68 | v = 0; | |
69 | for (t = 1; v < t && t <= 0x40; t <<= 2) | |
70 | v = (v << 4) | get_bits(gb, 4); | |
71 | *color = v & 3; | |
72 | if (v < 4) { /* Code for fill rest of line */ | |
73 | return INT_MAX; | |
74 | } | |
75 | return v >> 2; | |
76 | } | |
77 | ||
78 | static int decode_run_8bit(GetBitContext *gb, int *color) | |
79 | { | |
80 | int len; | |
81 | int has_run = get_bits1(gb); | |
82 | if (get_bits1(gb)) | |
83 | *color = get_bits(gb, 8); | |
84 | else | |
85 | *color = get_bits(gb, 2); | |
86 | if (has_run) { | |
87 | if (get_bits1(gb)) { | |
88 | len = get_bits(gb, 7); | |
89 | if (len == 0) | |
90 | len = INT_MAX; | |
91 | else | |
92 | len += 9; | |
93 | } else | |
94 | len = get_bits(gb, 3) + 2; | |
95 | } else | |
96 | len = 1; | |
97 | return len; | |
98 | } | |
99 | ||
100 | static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, | |
101 | const uint8_t *buf, int start, int buf_size, int is_8bit) | |
102 | { | |
103 | GetBitContext gb; | |
104 | int bit_len; | |
105 | int x, y, len, color; | |
106 | uint8_t *d; | |
107 | ||
108 | bit_len = (buf_size - start) * 8; | |
109 | init_get_bits(&gb, buf + start, bit_len); | |
110 | ||
111 | x = 0; | |
112 | y = 0; | |
113 | d = bitmap; | |
114 | for(;;) { | |
115 | if (get_bits_count(&gb) > bit_len) | |
116 | return -1; | |
117 | if (is_8bit) | |
118 | len = decode_run_8bit(&gb, &color); | |
119 | else | |
120 | len = decode_run_2bit(&gb, &color); | |
121 | len = FFMIN(len, w - x); | |
122 | memset(d + x, color, len); | |
123 | x += len; | |
124 | if (x >= w) { | |
125 | y++; | |
126 | if (y >= h) | |
127 | break; | |
128 | d += linesize; | |
129 | x = 0; | |
130 | /* byte align */ | |
131 | align_get_bits(&gb); | |
132 | } | |
133 | } | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static void guess_palette(DVDSubContext* ctx, | |
138 | uint32_t *rgba_palette, | |
139 | uint32_t subtitle_color) | |
140 | { | |
141 | static const uint8_t level_map[4][4] = { | |
142 | // this configuration (full range, lowest to highest) in tests | |
143 | // seemed most common, so assume this | |
144 | {0xff}, | |
145 | {0x00, 0xff}, | |
146 | {0x00, 0x80, 0xff}, | |
147 | {0x00, 0x55, 0xaa, 0xff}, | |
148 | }; | |
149 | uint8_t color_used[16] = { 0 }; | |
150 | int nb_opaque_colors, i, level, j, r, g, b; | |
151 | uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; | |
152 | ||
153 | if(ctx->has_palette) { | |
154 | for(i = 0; i < 4; i++) | |
155 | rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff) | |
156 | | ((alpha[i] * 17U) << 24); | |
157 | return; | |
158 | } | |
159 | ||
160 | for(i = 0; i < 4; i++) | |
161 | rgba_palette[i] = 0; | |
162 | ||
163 | nb_opaque_colors = 0; | |
164 | for(i = 0; i < 4; i++) { | |
165 | if (alpha[i] != 0 && !color_used[colormap[i]]) { | |
166 | color_used[colormap[i]] = 1; | |
167 | nb_opaque_colors++; | |
168 | } | |
169 | } | |
170 | ||
171 | if (nb_opaque_colors == 0) | |
172 | return; | |
173 | ||
174 | j = 0; | |
175 | memset(color_used, 0, 16); | |
176 | for(i = 0; i < 4; i++) { | |
177 | if (alpha[i] != 0) { | |
178 | if (!color_used[colormap[i]]) { | |
179 | level = level_map[nb_opaque_colors][j]; | |
180 | r = (((subtitle_color >> 16) & 0xff) * level) >> 8; | |
181 | g = (((subtitle_color >> 8) & 0xff) * level) >> 8; | |
182 | b = (((subtitle_color >> 0) & 0xff) * level) >> 8; | |
183 | rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24); | |
184 | color_used[colormap[i]] = (i + 1); | |
185 | j++; | |
186 | } else { | |
187 | rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) | | |
188 | ((alpha[i] * 17) << 24); | |
189 | } | |
190 | } | |
191 | } | |
192 | } | |
193 | ||
194 | static void reset_rects(AVSubtitle *sub_header) | |
195 | { | |
196 | int i; | |
197 | ||
198 | if (sub_header->rects) { | |
199 | for (i = 0; i < sub_header->num_rects; i++) { | |
200 | av_freep(&sub_header->rects[i]->pict.data[0]); | |
201 | av_freep(&sub_header->rects[i]->pict.data[1]); | |
202 | av_freep(&sub_header->rects[i]); | |
203 | } | |
204 | av_freep(&sub_header->rects); | |
205 | sub_header->num_rects = 0; | |
206 | } | |
207 | } | |
208 | ||
209 | #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a)) | |
210 | ||
211 | static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, | |
212 | const uint8_t *buf, int buf_size) | |
213 | { | |
214 | int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos; | |
215 | int big_offsets, offset_size, is_8bit = 0; | |
216 | const uint8_t *yuv_palette = NULL; | |
217 | uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; | |
218 | int date; | |
219 | int i; | |
220 | int is_menu = 0; | |
221 | ||
222 | if (buf_size < 10) | |
223 | return -1; | |
224 | ||
225 | if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */ | |
226 | big_offsets = 1; | |
227 | offset_size = 4; | |
228 | cmd_pos = 6; | |
229 | } else { | |
230 | big_offsets = 0; | |
231 | offset_size = 2; | |
232 | cmd_pos = 2; | |
233 | } | |
234 | ||
235 | cmd_pos = READ_OFFSET(buf + cmd_pos); | |
236 | ||
237 | if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) | |
238 | return AVERROR(EAGAIN); | |
239 | ||
240 | while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) { | |
241 | date = AV_RB16(buf + cmd_pos); | |
242 | next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2); | |
243 | av_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n", | |
244 | cmd_pos, next_cmd_pos, date); | |
245 | pos = cmd_pos + 2 + offset_size; | |
246 | offset1 = -1; | |
247 | offset2 = -1; | |
248 | x1 = y1 = x2 = y2 = 0; | |
249 | while (pos < buf_size) { | |
250 | cmd = buf[pos++]; | |
251 | av_dlog(NULL, "cmd=%02x\n", cmd); | |
252 | switch(cmd) { | |
253 | case 0x00: | |
254 | /* menu subpicture */ | |
255 | is_menu = 1; | |
256 | break; | |
257 | case 0x01: | |
258 | /* set start date */ | |
259 | sub_header->start_display_time = (date << 10) / 90; | |
260 | break; | |
261 | case 0x02: | |
262 | /* set end date */ | |
263 | sub_header->end_display_time = (date << 10) / 90; | |
264 | break; | |
265 | case 0x03: | |
266 | /* set colormap */ | |
267 | if ((buf_size - pos) < 2) | |
268 | goto fail; | |
269 | colormap[3] = buf[pos] >> 4; | |
270 | colormap[2] = buf[pos] & 0x0f; | |
271 | colormap[1] = buf[pos + 1] >> 4; | |
272 | colormap[0] = buf[pos + 1] & 0x0f; | |
273 | pos += 2; | |
274 | break; | |
275 | case 0x04: | |
276 | /* set alpha */ | |
277 | if ((buf_size - pos) < 2) | |
278 | goto fail; | |
279 | alpha[3] = buf[pos] >> 4; | |
280 | alpha[2] = buf[pos] & 0x0f; | |
281 | alpha[1] = buf[pos + 1] >> 4; | |
282 | alpha[0] = buf[pos + 1] & 0x0f; | |
283 | pos += 2; | |
284 | av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]); | |
285 | break; | |
286 | case 0x05: | |
287 | case 0x85: | |
288 | if ((buf_size - pos) < 6) | |
289 | goto fail; | |
290 | x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4); | |
291 | x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2]; | |
292 | y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4); | |
293 | y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5]; | |
294 | if (cmd & 0x80) | |
295 | is_8bit = 1; | |
296 | av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2); | |
297 | pos += 6; | |
298 | break; | |
299 | case 0x06: | |
300 | if ((buf_size - pos) < 4) | |
301 | goto fail; | |
302 | offset1 = AV_RB16(buf + pos); | |
303 | offset2 = AV_RB16(buf + pos + 2); | |
304 | av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2); | |
305 | pos += 4; | |
306 | break; | |
307 | case 0x86: | |
308 | if ((buf_size - pos) < 8) | |
309 | goto fail; | |
310 | offset1 = AV_RB32(buf + pos); | |
311 | offset2 = AV_RB32(buf + pos + 4); | |
312 | av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2); | |
313 | pos += 8; | |
314 | break; | |
315 | ||
316 | case 0x83: | |
317 | /* HD set palette */ | |
318 | if ((buf_size - pos) < 768) | |
319 | goto fail; | |
320 | yuv_palette = buf + pos; | |
321 | pos += 768; | |
322 | break; | |
323 | case 0x84: | |
324 | /* HD set contrast (alpha) */ | |
325 | if ((buf_size - pos) < 256) | |
326 | goto fail; | |
327 | for (i = 0; i < 256; i++) | |
328 | alpha[i] = 0xFF - buf[pos+i]; | |
329 | pos += 256; | |
330 | break; | |
331 | ||
332 | case 0xff: | |
333 | goto the_end; | |
334 | default: | |
335 | av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd); | |
336 | goto the_end; | |
337 | } | |
338 | } | |
339 | the_end: | |
340 | if (offset1 >= 0) { | |
341 | int w, h; | |
342 | uint8_t *bitmap; | |
343 | ||
344 | /* decode the bitmap */ | |
345 | w = x2 - x1 + 1; | |
346 | if (w < 0) | |
347 | w = 0; | |
348 | h = y2 - y1 + 1; | |
349 | if (h < 0) | |
350 | h = 0; | |
351 | if (w > 0 && h > 0) { | |
352 | reset_rects(sub_header); | |
353 | ||
354 | bitmap = av_malloc(w * h); | |
355 | sub_header->rects = av_mallocz(sizeof(*sub_header->rects)); | |
356 | sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect)); | |
357 | sub_header->num_rects = 1; | |
358 | sub_header->rects[0]->pict.data[0] = bitmap; | |
359 | decode_rle(bitmap, w * 2, w, (h + 1) / 2, | |
360 | buf, offset1, buf_size, is_8bit); | |
361 | decode_rle(bitmap + w, w * 2, w, h / 2, | |
362 | buf, offset2, buf_size, is_8bit); | |
363 | sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE); | |
364 | if (is_8bit) { | |
365 | if (!yuv_palette) | |
366 | goto fail; | |
367 | sub_header->rects[0]->nb_colors = 256; | |
368 | yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256); | |
369 | } else { | |
370 | sub_header->rects[0]->nb_colors = 4; | |
371 | guess_palette(ctx, (uint32_t*)sub_header->rects[0]->pict.data[1], | |
372 | 0xffff00); | |
373 | } | |
374 | sub_header->rects[0]->x = x1; | |
375 | sub_header->rects[0]->y = y1; | |
376 | sub_header->rects[0]->w = w; | |
377 | sub_header->rects[0]->h = h; | |
378 | sub_header->rects[0]->type = SUBTITLE_BITMAP; | |
379 | sub_header->rects[0]->pict.linesize[0] = w; | |
380 | sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0; | |
381 | } | |
382 | } | |
383 | if (next_cmd_pos < cmd_pos) { | |
384 | av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n"); | |
385 | break; | |
386 | } | |
387 | if (next_cmd_pos == cmd_pos) | |
388 | break; | |
389 | cmd_pos = next_cmd_pos; | |
390 | } | |
391 | if (sub_header->num_rects > 0) | |
392 | return is_menu; | |
393 | fail: | |
394 | reset_rects(sub_header); | |
395 | return -1; | |
396 | } | |
397 | ||
398 | static int is_transp(const uint8_t *buf, int pitch, int n, | |
399 | const uint8_t *transp_color) | |
400 | { | |
401 | int i; | |
402 | for(i = 0; i < n; i++) { | |
403 | if (!transp_color[*buf]) | |
404 | return 0; | |
405 | buf += pitch; | |
406 | } | |
407 | return 1; | |
408 | } | |
409 | ||
410 | /* return 0 if empty rectangle, 1 if non empty */ | |
411 | static int find_smallest_bounding_rectangle(AVSubtitle *s) | |
412 | { | |
413 | uint8_t transp_color[256] = { 0 }; | |
414 | int y1, y2, x1, x2, y, w, h, i; | |
415 | uint8_t *bitmap; | |
416 | ||
417 | if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0) | |
418 | return 0; | |
419 | ||
420 | for(i = 0; i < s->rects[0]->nb_colors; i++) { | |
421 | if ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0) | |
422 | transp_color[i] = 1; | |
423 | } | |
424 | y1 = 0; | |
425 | while (y1 < s->rects[0]->h && is_transp(s->rects[0]->pict.data[0] + y1 * s->rects[0]->pict.linesize[0], | |
426 | 1, s->rects[0]->w, transp_color)) | |
427 | y1++; | |
428 | if (y1 == s->rects[0]->h) { | |
429 | av_freep(&s->rects[0]->pict.data[0]); | |
430 | s->rects[0]->w = s->rects[0]->h = 0; | |
431 | return 0; | |
432 | } | |
433 | ||
434 | y2 = s->rects[0]->h - 1; | |
435 | while (y2 > 0 && is_transp(s->rects[0]->pict.data[0] + y2 * s->rects[0]->pict.linesize[0], 1, | |
436 | s->rects[0]->w, transp_color)) | |
437 | y2--; | |
438 | x1 = 0; | |
439 | while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->pict.data[0] + x1, s->rects[0]->pict.linesize[0], | |
440 | s->rects[0]->h, transp_color)) | |
441 | x1++; | |
442 | x2 = s->rects[0]->w - 1; | |
443 | while (x2 > 0 && is_transp(s->rects[0]->pict.data[0] + x2, s->rects[0]->pict.linesize[0], s->rects[0]->h, | |
444 | transp_color)) | |
445 | x2--; | |
446 | w = x2 - x1 + 1; | |
447 | h = y2 - y1 + 1; | |
448 | bitmap = av_malloc(w * h); | |
449 | if (!bitmap) | |
450 | return 1; | |
451 | for(y = 0; y < h; y++) { | |
452 | memcpy(bitmap + w * y, s->rects[0]->pict.data[0] + x1 + (y1 + y) * s->rects[0]->pict.linesize[0], w); | |
453 | } | |
454 | av_freep(&s->rects[0]->pict.data[0]); | |
455 | s->rects[0]->pict.data[0] = bitmap; | |
456 | s->rects[0]->pict.linesize[0] = w; | |
457 | s->rects[0]->w = w; | |
458 | s->rects[0]->h = h; | |
459 | s->rects[0]->x += x1; | |
460 | s->rects[0]->y += y1; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | #ifdef DEBUG | |
465 | #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255) | |
466 | static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h, | |
467 | uint32_t *rgba_palette) | |
468 | { | |
469 | int x, y, alpha; | |
470 | uint32_t v; | |
471 | int back[3] = {0, 255, 0}; /* green background */ | |
472 | FILE *f; | |
473 | ||
474 | f = fopen(filename, "w"); | |
475 | if (!f) { | |
476 | perror(filename); | |
477 | return; | |
478 | } | |
479 | fprintf(f, "P6\n" | |
480 | "%d %d\n" | |
481 | "%d\n", | |
482 | w, h, 255); | |
483 | for(y = 0; y < h; y++) { | |
484 | for(x = 0; x < w; x++) { | |
485 | v = rgba_palette[bitmap[y * w + x]]; | |
486 | alpha = v >> 24; | |
487 | putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f); | |
488 | putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f); | |
489 | putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f); | |
490 | } | |
491 | } | |
492 | fclose(f); | |
493 | } | |
494 | #endif | |
495 | ||
496 | static int append_to_cached_buf(AVCodecContext *avctx, | |
497 | const uint8_t *buf, int buf_size) | |
498 | { | |
499 | DVDSubContext *ctx = avctx->priv_data; | |
500 | ||
501 | if (ctx->buf_size > 0xffff - buf_size) { | |
502 | av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct " | |
503 | "too large SPU packets aborted.\n"); | |
504 | av_freep(&ctx->buf); | |
505 | return AVERROR_INVALIDDATA; | |
506 | } | |
507 | ctx->buf = av_realloc(ctx->buf, ctx->buf_size + buf_size); | |
508 | if (!ctx->buf) | |
509 | return AVERROR(ENOMEM); | |
510 | memcpy(ctx->buf + ctx->buf_size, buf, buf_size); | |
511 | ctx->buf_size += buf_size; | |
512 | return 0; | |
513 | } | |
514 | ||
515 | static int dvdsub_decode(AVCodecContext *avctx, | |
516 | void *data, int *data_size, | |
517 | AVPacket *avpkt) | |
518 | { | |
519 | DVDSubContext *ctx = avctx->priv_data; | |
520 | const uint8_t *buf = avpkt->data; | |
521 | int buf_size = avpkt->size; | |
522 | AVSubtitle *sub = data; | |
523 | int is_menu; | |
524 | ||
525 | if (ctx->buf) { | |
526 | int ret = append_to_cached_buf(avctx, buf, buf_size); | |
527 | if (ret < 0) { | |
528 | *data_size = 0; | |
529 | return ret; | |
530 | } | |
531 | buf = ctx->buf; | |
532 | buf_size = ctx->buf_size; | |
533 | } | |
534 | ||
535 | is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size); | |
536 | if (is_menu == AVERROR(EAGAIN)) { | |
537 | *data_size = 0; | |
538 | return append_to_cached_buf(avctx, buf, buf_size); | |
539 | } | |
540 | ||
541 | if (is_menu < 0) { | |
542 | no_subtitle: | |
543 | reset_rects(sub); | |
544 | *data_size = 0; | |
545 | ||
546 | return buf_size; | |
547 | } | |
548 | if (!is_menu && find_smallest_bounding_rectangle(sub) == 0) | |
549 | goto no_subtitle; | |
550 | ||
551 | #if defined(DEBUG) | |
552 | { | |
553 | char ppm_name[32]; | |
554 | ||
555 | snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++); | |
556 | av_dlog(NULL, "start=%d ms end =%d ms\n", | |
557 | sub->start_display_time, | |
558 | sub->end_display_time); | |
559 | ppm_save(ppm_name, sub->rects[0]->pict.data[0], | |
560 | sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->pict.data[1]); | |
561 | } | |
562 | #endif | |
563 | ||
564 | av_freep(&ctx->buf); | |
565 | ctx->buf_size = 0; | |
566 | *data_size = 1; | |
567 | return buf_size; | |
568 | } | |
569 | ||
570 | static void parse_palette(DVDSubContext *ctx, char *p) | |
571 | { | |
572 | int i; | |
573 | ||
574 | ctx->has_palette = 1; | |
575 | for(i=0;i<16;i++) { | |
576 | ctx->palette[i] = strtoul(p, &p, 16); | |
577 | while(*p == ',' || av_isspace(*p)) | |
578 | p++; | |
579 | } | |
580 | } | |
581 | ||
582 | static int dvdsub_parse_extradata(AVCodecContext *avctx) | |
583 | { | |
584 | DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data; | |
585 | char *dataorig, *data; | |
586 | ||
587 | if (!avctx->extradata || !avctx->extradata_size) | |
588 | return 1; | |
589 | ||
590 | dataorig = data = av_malloc(avctx->extradata_size+1); | |
591 | if (!data) | |
592 | return AVERROR(ENOMEM); | |
593 | memcpy(data, avctx->extradata, avctx->extradata_size); | |
594 | data[avctx->extradata_size] = '\0'; | |
595 | ||
596 | for(;;) { | |
597 | int pos = strcspn(data, "\n\r"); | |
598 | if (pos==0 && *data==0) | |
599 | break; | |
600 | ||
601 | if (strncmp("palette:", data, 8) == 0) { | |
602 | parse_palette(ctx, data + 8); | |
603 | } else if (strncmp("size:", data, 5) == 0) { | |
604 | int w, h; | |
605 | if (sscanf(data + 5, "%dx%d", &w, &h) == 2) { | |
606 | int ret = ff_set_dimensions(avctx, w, h); | |
607 | if (ret < 0) { | |
608 | av_free(dataorig); | |
609 | return ret; | |
610 | } | |
611 | } | |
612 | } | |
613 | ||
614 | data += pos; | |
615 | data += strspn(data, "\n\r"); | |
616 | } | |
617 | ||
618 | av_free(dataorig); | |
619 | return 1; | |
620 | } | |
621 | ||
622 | static av_cold int dvdsub_init(AVCodecContext *avctx) | |
623 | { | |
624 | DVDSubContext *ctx = avctx->priv_data; | |
625 | int ret; | |
626 | ||
627 | if ((ret = dvdsub_parse_extradata(avctx)) < 0) | |
628 | return ret; | |
629 | ||
630 | if (ctx->palette_str) | |
631 | parse_palette(ctx, ctx->palette_str); | |
632 | if (ctx->has_palette) { | |
633 | int i; | |
634 | av_log(avctx, AV_LOG_DEBUG, "palette:"); | |
635 | for(i=0;i<16;i++) | |
636 | av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]); | |
637 | av_log(avctx, AV_LOG_DEBUG, "\n"); | |
638 | } | |
639 | ||
640 | return 1; | |
641 | } | |
642 | ||
643 | static av_cold int dvdsub_close(AVCodecContext *avctx) | |
644 | { | |
645 | DVDSubContext *ctx = avctx->priv_data; | |
646 | av_freep(&ctx->buf); | |
647 | ctx->buf_size = 0; | |
648 | return 0; | |
649 | } | |
650 | ||
651 | #define OFFSET(field) offsetof(DVDSubContext, field) | |
652 | #define VD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM | |
653 | static const AVOption options[] = { | |
654 | { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VD }, | |
655 | { NULL } | |
656 | }; | |
657 | static const AVClass dvdsub_class = { | |
658 | .class_name = "dvdsubdec", | |
659 | .item_name = av_default_item_name, | |
660 | .option = options, | |
661 | .version = LIBAVUTIL_VERSION_INT, | |
662 | }; | |
663 | ||
664 | AVCodec ff_dvdsub_decoder = { | |
665 | .name = "dvdsub", | |
666 | .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"), | |
667 | .type = AVMEDIA_TYPE_SUBTITLE, | |
668 | .id = AV_CODEC_ID_DVD_SUBTITLE, | |
669 | .priv_data_size = sizeof(DVDSubContext), | |
670 | .init = dvdsub_init, | |
671 | .decode = dvdsub_decode, | |
672 | .close = dvdsub_close, | |
673 | .priv_class = &dvdsub_class, | |
674 | }; |