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path: root/libavcodec/dvdsubdec.c (plain)
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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#include "libavutil/bswap.h"
32
33typedef 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#ifdef DEBUG
46 int sub_id;
47#endif
48} DVDSubContext;
49
50static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
51{
52 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
53 uint8_t r, g, b;
54 int i, y, cb, cr;
55 int r_add, g_add, b_add;
56
57 for (i = num_values; i > 0; i--) {
58 y = *ycbcr++;
59 cr = *ycbcr++;
60 cb = *ycbcr++;
61 YUV_TO_RGB1_CCIR(cb, cr);
62 YUV_TO_RGB2_CCIR(r, g, b, y);
63 *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
64 }
65}
66
67static int decode_run_2bit(GetBitContext *gb, int *color)
68{
69 unsigned int v, t;
70
71 v = 0;
72 for (t = 1; v < t && t <= 0x40; t <<= 2)
73 v = (v << 4) | get_bits(gb, 4);
74 *color = v & 3;
75 if (v < 4) { /* Code for fill rest of line */
76 return INT_MAX;
77 }
78 return v >> 2;
79}
80
81static int decode_run_8bit(GetBitContext *gb, int *color)
82{
83 int len;
84 int has_run = get_bits1(gb);
85 if (get_bits1(gb))
86 *color = get_bits(gb, 8);
87 else
88 *color = get_bits(gb, 2);
89 if (has_run) {
90 if (get_bits1(gb)) {
91 len = get_bits(gb, 7);
92 if (len == 0)
93 len = INT_MAX;
94 else
95 len += 9;
96 } else
97 len = get_bits(gb, 3) + 2;
98 } else
99 len = 1;
100 return len;
101}
102
103static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
104 const uint8_t *buf, int start, int buf_size, int is_8bit)
105{
106 GetBitContext gb;
107 int bit_len;
108 int x, y, len, color;
109 uint8_t *d;
110
111 if (start >= buf_size)
112 return -1;
113
114 if (w <= 0 || h <= 0)
115 return -1;
116
117 bit_len = (buf_size - start) * 8;
118 init_get_bits(&gb, buf + start, bit_len);
119
120 x = 0;
121 y = 0;
122 d = bitmap;
123 for(;;) {
124 if (get_bits_count(&gb) > bit_len)
125 return -1;
126 if (is_8bit)
127 len = decode_run_8bit(&gb, &color);
128 else
129 len = decode_run_2bit(&gb, &color);
130 len = FFMIN(len, w - x);
131 memset(d + x, color, len);
132 x += len;
133 if (x >= w) {
134 y++;
135 if (y >= h)
136 break;
137 d += linesize;
138 x = 0;
139 /* byte align */
140 align_get_bits(&gb);
141 }
142 }
143 return 0;
144}
145
146static void guess_palette(DVDSubContext* ctx,
147 uint32_t *rgba_palette,
148 uint32_t subtitle_color)
149{
150 static const uint8_t level_map[4][4] = {
151 // this configuration (full range, lowest to highest) in tests
152 // seemed most common, so assume this
153 {0xff},
154 {0x00, 0xff},
155 {0x00, 0x80, 0xff},
156 {0x00, 0x55, 0xaa, 0xff},
157 };
158 uint8_t color_used[16] = { 0 };
159 int nb_opaque_colors, i, level, j, r, g, b;
160 uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
161
162 if(ctx->has_palette) {
163 for(i = 0; i < 4; i++)
164 rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
165 | ((alpha[i] * 17U) << 24);
166 return;
167 }
168
169 for(i = 0; i < 4; i++)
170 rgba_palette[i] = 0;
171
172 nb_opaque_colors = 0;
173 for(i = 0; i < 4; i++) {
174 if (alpha[i] != 0 && !color_used[colormap[i]]) {
175 color_used[colormap[i]] = 1;
176 nb_opaque_colors++;
177 }
178 }
179
180 if (nb_opaque_colors == 0)
181 return;
182
183 j = 0;
184 memset(color_used, 0, 16);
185 for(i = 0; i < 4; i++) {
186 if (alpha[i] != 0) {
187 if (!color_used[colormap[i]]) {
188 level = level_map[nb_opaque_colors - 1][j];
189 r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
190 g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
191 b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
192 rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17U) << 24);
193 color_used[colormap[i]] = (i + 1);
194 j++;
195 } else {
196 rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
197 ((alpha[i] * 17U) << 24);
198 }
199 }
200 }
201}
202
203static void reset_rects(AVSubtitle *sub_header)
204{
205 int i;
206
207 if (sub_header->rects) {
208 for (i = 0; i < sub_header->num_rects; i++) {
209 av_freep(&sub_header->rects[i]->data[0]);
210 av_freep(&sub_header->rects[i]->data[1]);
211 av_freep(&sub_header->rects[i]);
212 }
213 av_freep(&sub_header->rects);
214 sub_header->num_rects = 0;
215 }
216}
217
218#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
219
220static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
221 const uint8_t *buf, int buf_size)
222{
223 int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;
224 int big_offsets, offset_size, is_8bit = 0;
225 const uint8_t *yuv_palette = NULL;
226 uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
227 int date;
228 int i;
229 int is_menu = 0;
230 uint32_t size;
231 int64_t offset1, offset2;
232
233 if (buf_size < 10)
234 return -1;
235
236 if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
237 big_offsets = 1;
238 offset_size = 4;
239 cmd_pos = 6;
240 } else {
241 big_offsets = 0;
242 offset_size = 2;
243 cmd_pos = 2;
244 }
245
246 size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
247 cmd_pos = READ_OFFSET(buf + cmd_pos);
248
249 if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {
250 if (cmd_pos > size) {
251 av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");
252 return 0;
253 }
254 return AVERROR(EAGAIN);
255 }
256
257 while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
258 date = AV_RB16(buf + cmd_pos);
259 next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
260 ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
261 cmd_pos, next_cmd_pos, date);
262 pos = cmd_pos + 2 + offset_size;
263 offset1 = -1;
264 offset2 = -1;
265 x1 = y1 = x2 = y2 = 0;
266 while (pos < buf_size) {
267 cmd = buf[pos++];
268 ff_dlog(NULL, "cmd=%02x\n", cmd);
269 switch(cmd) {
270 case 0x00:
271 /* menu subpicture */
272 is_menu = 1;
273 break;
274 case 0x01:
275 /* set start date */
276 sub_header->start_display_time = (date << 10) / 90;
277 break;
278 case 0x02:
279 /* set end date */
280 sub_header->end_display_time = (date << 10) / 90;
281 break;
282 case 0x03:
283 /* set colormap */
284 if ((buf_size - pos) < 2)
285 goto fail;
286 colormap[3] = buf[pos] >> 4;
287 colormap[2] = buf[pos] & 0x0f;
288 colormap[1] = buf[pos + 1] >> 4;
289 colormap[0] = buf[pos + 1] & 0x0f;
290 pos += 2;
291 break;
292 case 0x04:
293 /* set alpha */
294 if ((buf_size - pos) < 2)
295 goto fail;
296 alpha[3] = buf[pos] >> 4;
297 alpha[2] = buf[pos] & 0x0f;
298 alpha[1] = buf[pos + 1] >> 4;
299 alpha[0] = buf[pos + 1] & 0x0f;
300 pos += 2;
301 ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
302 break;
303 case 0x05:
304 case 0x85:
305 if ((buf_size - pos) < 6)
306 goto fail;
307 x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
308 x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
309 y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
310 y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
311 if (cmd & 0x80)
312 is_8bit = 1;
313 ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
314 pos += 6;
315 break;
316 case 0x06:
317 if ((buf_size - pos) < 4)
318 goto fail;
319 offset1 = AV_RB16(buf + pos);
320 offset2 = AV_RB16(buf + pos + 2);
321 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
322 pos += 4;
323 break;
324 case 0x86:
325 if ((buf_size - pos) < 8)
326 goto fail;
327 offset1 = AV_RB32(buf + pos);
328 offset2 = AV_RB32(buf + pos + 4);
329 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
330 pos += 8;
331 break;
332
333 case 0x83:
334 /* HD set palette */
335 if ((buf_size - pos) < 768)
336 goto fail;
337 yuv_palette = buf + pos;
338 pos += 768;
339 break;
340 case 0x84:
341 /* HD set contrast (alpha) */
342 if ((buf_size - pos) < 256)
343 goto fail;
344 for (i = 0; i < 256; i++)
345 alpha[i] = 0xFF - buf[pos+i];
346 pos += 256;
347 break;
348
349 case 0xff:
350 goto the_end;
351 default:
352 ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
353 goto the_end;
354 }
355 }
356 the_end:
357 if (offset1 >= buf_size || offset2 >= buf_size)
358 goto fail;
359
360 if (offset1 >= 0 && offset2 >= 0) {
361 int w, h;
362 uint8_t *bitmap;
363
364 /* decode the bitmap */
365 w = x2 - x1 + 1;
366 if (w < 0)
367 w = 0;
368 h = y2 - y1 + 1;
369 if (h < 0)
370 h = 0;
371 if (w > 0 && h > 1) {
372 reset_rects(sub_header);
373
374 sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
375 if (!sub_header->rects)
376 goto fail;
377 sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
378 if (!sub_header->rects[0])
379 goto fail;
380 sub_header->num_rects = 1;
381 bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);
382 if (!bitmap)
383 goto fail;
384 if (decode_rle(bitmap, w * 2, w, (h + 1) / 2,
385 buf, offset1, buf_size, is_8bit) < 0)
386 goto fail;
387 if (decode_rle(bitmap + w, w * 2, w, h / 2,
388 buf, offset2, buf_size, is_8bit) < 0)
389 goto fail;
390 sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
391 if (!sub_header->rects[0]->data[1])
392 goto fail;
393 if (is_8bit) {
394 if (!yuv_palette)
395 goto fail;
396 sub_header->rects[0]->nb_colors = 256;
397 yuv_a_to_rgba(yuv_palette, alpha,
398 (uint32_t *)sub_header->rects[0]->data[1],
399 256);
400 } else {
401 sub_header->rects[0]->nb_colors = 4;
402 guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],
403 0xffff00);
404 }
405 sub_header->rects[0]->x = x1;
406 sub_header->rects[0]->y = y1;
407 sub_header->rects[0]->w = w;
408 sub_header->rects[0]->h = h;
409 sub_header->rects[0]->type = SUBTITLE_BITMAP;
410 sub_header->rects[0]->linesize[0] = w;
411 sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
412
413#if FF_API_AVPICTURE
414FF_DISABLE_DEPRECATION_WARNINGS
415 for (i = 0; i < 4; i++) {
416 sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i];
417 sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i];
418 }
419FF_ENABLE_DEPRECATION_WARNINGS
420#endif
421 }
422 }
423 if (next_cmd_pos < cmd_pos) {
424 av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");
425 break;
426 }
427 if (next_cmd_pos == cmd_pos)
428 break;
429 cmd_pos = next_cmd_pos;
430 }
431 if (sub_header->num_rects > 0)
432 return is_menu;
433 fail:
434 reset_rects(sub_header);
435 return -1;
436}
437
438static int is_transp(const uint8_t *buf, int pitch, int n,
439 const uint8_t *transp_color)
440{
441 int i;
442 for(i = 0; i < n; i++) {
443 if (!transp_color[*buf])
444 return 0;
445 buf += pitch;
446 }
447 return 1;
448}
449
450/* return 0 if empty rectangle, 1 if non empty */
451static int find_smallest_bounding_rectangle(AVSubtitle *s)
452{
453 uint8_t transp_color[256] = { 0 };
454 int y1, y2, x1, x2, y, w, h, i;
455 uint8_t *bitmap;
456
457 if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
458 return 0;
459
460 for(i = 0; i < s->rects[0]->nb_colors; i++) {
461 if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0)
462 transp_color[i] = 1;
463 }
464 y1 = 0;
465 while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
466 1, s->rects[0]->w, transp_color))
467 y1++;
468 if (y1 == s->rects[0]->h) {
469 av_freep(&s->rects[0]->data[0]);
470 s->rects[0]->w = s->rects[0]->h = 0;
471 return 0;
472 }
473
474 y2 = s->rects[0]->h - 1;
475 while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,
476 s->rects[0]->w, transp_color))
477 y2--;
478 x1 = 0;
479 while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],
480 s->rects[0]->h, transp_color))
481 x1++;
482 x2 = s->rects[0]->w - 1;
483 while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,
484 transp_color))
485 x2--;
486 w = x2 - x1 + 1;
487 h = y2 - y1 + 1;
488 bitmap = av_malloc(w * h);
489 if (!bitmap)
490 return 1;
491 for(y = 0; y < h; y++) {
492 memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);
493 }
494 av_freep(&s->rects[0]->data[0]);
495 s->rects[0]->data[0] = bitmap;
496 s->rects[0]->linesize[0] = w;
497 s->rects[0]->w = w;
498 s->rects[0]->h = h;
499 s->rects[0]->x += x1;
500 s->rects[0]->y += y1;
501
502#if FF_API_AVPICTURE
503FF_DISABLE_DEPRECATION_WARNINGS
504 for (i = 0; i < 4; i++) {
505 s->rects[0]->pict.data[i] = s->rects[0]->data[i];
506 s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];
507 }
508FF_ENABLE_DEPRECATION_WARNINGS
509#endif
510
511 return 1;
512}
513
514#ifdef DEBUG
515#define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)
516static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
517 uint32_t *rgba_palette)
518{
519 int x, y, alpha;
520 uint32_t v;
521 int back[3] = {0, 255, 0}; /* green background */
522 FILE *f;
523
524 f = fopen(filename, "w");
525 if (!f) {
526 perror(filename);
527 return;
528 }
529 fprintf(f, "P6\n"
530 "%d %d\n"
531 "%d\n",
532 w, h, 255);
533 for(y = 0; y < h; y++) {
534 for(x = 0; x < w; x++) {
535 v = rgba_palette[bitmap[y * w + x]];
536 alpha = v >> 24;
537 putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
538 putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
539 putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);
540 }
541 }
542 fclose(f);
543}
544#endif
545
546static int append_to_cached_buf(AVCodecContext *avctx,
547 const uint8_t *buf, int buf_size)
548{
549 DVDSubContext *ctx = avctx->priv_data;
550
551 av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf));
552 if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) {
553 av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
554 "too large SPU packets aborted.\n");
555 ctx->buf_size = 0;
556 return AVERROR_INVALIDDATA;
557 }
558 memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
559 ctx->buf_size += buf_size;
560 return 0;
561}
562
563static int dvdsub_decode(AVCodecContext *avctx,
564 void *data, int *data_size,
565 AVPacket *avpkt)
566{
567 DVDSubContext *ctx = avctx->priv_data;
568 const uint8_t *buf = avpkt->data;
569 int buf_size = avpkt->size;
570 AVSubtitle *sub = data;
571 int appended = 0;
572 int is_menu;
573
574 if (ctx->buf_size) {
575 int ret = append_to_cached_buf(avctx, buf, buf_size);
576 if (ret < 0) {
577 *data_size = 0;
578 return ret;
579 }
580 buf = ctx->buf;
581 buf_size = ctx->buf_size;
582 appended = 1;
583 }
584
585 is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
586 if (is_menu == AVERROR(EAGAIN)) {
587 *data_size = 0;
588 return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);
589 }
590
591 if (is_menu < 0) {
592 no_subtitle:
593 reset_rects(sub);
594 *data_size = 0;
595
596 return buf_size;
597 }
598 if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)
599 goto no_subtitle;
600
601 if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))
602 goto no_subtitle;
603
604#if defined(DEBUG)
605 {
606 char ppm_name[32];
607
608 snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);
609 ff_dlog(NULL, "start=%d ms end =%d ms\n",
610 sub->start_display_time,
611 sub->end_display_time);
612 ppm_save(ppm_name, sub->rects[0]->data[0],
613 sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]);
614 }
615#endif
616
617 ctx->buf_size = 0;
618 *data_size = 1;
619 return buf_size;
620}
621
622static void parse_palette(DVDSubContext *ctx, char *p)
623{
624 int i;
625
626 ctx->has_palette = 1;
627 for(i=0;i<16;i++) {
628 ctx->palette[i] = strtoul(p, &p, 16);
629 while(*p == ',' || av_isspace(*p))
630 p++;
631 }
632}
633
634static int parse_ifo_palette(DVDSubContext *ctx, char *p)
635{
636 FILE *ifo;
637 char ifostr[12];
638 uint32_t sp_pgci, pgci, off_pgc, pgc;
639 uint8_t r, g, b, yuv[65], *buf;
640 int i, y, cb, cr, r_add, g_add, b_add;
641 int ret = 0;
642 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
643
644 ctx->has_palette = 0;
645 if ((ifo = fopen(p, "r")) == NULL) {
646 av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));
647 return AVERROR_EOF;
648 }
649 if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
650 av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
651 ret = AVERROR_INVALIDDATA;
652 goto end;
653 }
654 if (fseek(ifo, 0xCC, SEEK_SET) == -1) {
655 ret = AVERROR(errno);
656 goto end;
657 }
658 if (fread(&sp_pgci, 4, 1, ifo) == 1) {
659 pgci = av_be2ne32(sp_pgci) * 2048;
660 if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {
661 ret = AVERROR(errno);
662 goto end;
663 }
664 if (fread(&off_pgc, 4, 1, ifo) == 1) {
665 pgc = pgci + av_be2ne32(off_pgc);
666 if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {
667 ret = AVERROR(errno);
668 goto end;
669 }
670 if (fread(yuv, 64, 1, ifo) == 1) {
671 buf = yuv;
672 for(i=0; i<16; i++) {
673 y = *++buf;
674 cr = *++buf;
675 cb = *++buf;
676 YUV_TO_RGB1_CCIR(cb, cr);
677 YUV_TO_RGB2_CCIR(r, g, b, y);
678 ctx->palette[i] = (r << 16) + (g << 8) + b;
679 buf++;
680 }
681 ctx->has_palette = 1;
682 }
683 }
684 }
685 if (ctx->has_palette == 0) {
686 av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
687 ret = AVERROR_INVALIDDATA;
688 }
689end:
690 fclose(ifo);
691 return ret;
692}
693
694static int dvdsub_parse_extradata(AVCodecContext *avctx)
695{
696 DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
697 char *dataorig, *data;
698 int ret = 1;
699
700 if (!avctx->extradata || !avctx->extradata_size)
701 return 1;
702
703 dataorig = data = av_malloc(avctx->extradata_size+1);
704 if (!data)
705 return AVERROR(ENOMEM);
706 memcpy(data, avctx->extradata, avctx->extradata_size);
707 data[avctx->extradata_size] = '\0';
708
709 for(;;) {
710 int pos = strcspn(data, "\n\r");
711 if (pos==0 && *data==0)
712 break;
713
714 if (strncmp("palette:", data, 8) == 0) {
715 parse_palette(ctx, data + 8);
716 } else if (strncmp("size:", data, 5) == 0) {
717 int w, h;
718 if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
719 ret = ff_set_dimensions(avctx, w, h);
720 if (ret < 0)
721 goto fail;
722 }
723 }
724
725 data += pos;
726 data += strspn(data, "\n\r");
727 }
728
729fail:
730 av_free(dataorig);
731 return ret;
732}
733
734static av_cold int dvdsub_init(AVCodecContext *avctx)
735{
736 DVDSubContext *ctx = avctx->priv_data;
737 int ret;
738
739 if ((ret = dvdsub_parse_extradata(avctx)) < 0)
740 return ret;
741
742 if (ctx->ifo_str)
743 parse_ifo_palette(ctx, ctx->ifo_str);
744 if (ctx->palette_str)
745 parse_palette(ctx, ctx->palette_str);
746 if (ctx->has_palette) {
747 int i;
748 av_log(avctx, AV_LOG_DEBUG, "palette:");
749 for(i=0;i<16;i++)
750 av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]);
751 av_log(avctx, AV_LOG_DEBUG, "\n");
752 }
753
754 return 1;
755}
756
757static void dvdsub_flush(AVCodecContext *avctx)
758{
759 DVDSubContext *ctx = avctx->priv_data;
760 ctx->buf_size = 0;
761}
762
763static av_cold int dvdsub_close(AVCodecContext *avctx)
764{
765 dvdsub_flush(avctx);
766 return 0;
767}
768
769#define OFFSET(field) offsetof(DVDSubContext, field)
770#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
771static const AVOption options[] = {
772 { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
773 { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
774 { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
775 { NULL }
776};
777static const AVClass dvdsub_class = {
778 .class_name = "dvdsubdec",
779 .item_name = av_default_item_name,
780 .option = options,
781 .version = LIBAVUTIL_VERSION_INT,
782};
783
784AVCodec ff_dvdsub_decoder = {
785 .name = "dvdsub",
786 .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
787 .type = AVMEDIA_TYPE_SUBTITLE,
788 .id = AV_CODEC_ID_DVD_SUBTITLE,
789 .priv_data_size = sizeof(DVDSubContext),
790 .init = dvdsub_init,
791 .decode = dvdsub_decode,
792 .flush = dvdsub_flush,
793 .close = dvdsub_close,
794 .priv_class = &dvdsub_class,
795};
796
generated by cgit at 2024-05-17 02:04:42 (GMT)