GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/dvdsubdec.c Lines: 267 443 60.3 %
Date: 2020-09-21 17:35:45 Branches: 134 270 49.6 %

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 "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/bswap.h"
31
32
typedef struct DVDSubContext
33
{
34
  AVClass *class;
35
  uint32_t palette[16];
36
  char    *palette_str;
37
  char    *ifo_str;
38
  int      has_palette;
39
  uint8_t  colormap[4];
40
  uint8_t  alpha[256];
41
  uint8_t  buf[0x10000];
42
  int      buf_size;
43
  int      forced_subs_only;
44
  uint8_t  used_color[256];
45
#ifdef DEBUG
46
  int sub_id;
47
#endif
48
} DVDSubContext;
49
50
static 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++ = ((unsigned)*alpha++ << 24) | (r << 16) | (g << 8) | b;
64
    }
65
}
66
67
296727
static int decode_run_2bit(GetBitContext *gb, int *color)
68
{
69
    unsigned int v, t;
70
71
296727
    v = 0;
72

791461
    for (t = 1; v < t && t <= 0x40; t <<= 2)
73
494734
        v = (v << 4) | get_bits(gb, 4);
74
296727
    *color = v & 3;
75
296727
    if (v < 4) { /* Code for fill rest of line */
76
41582
        return INT_MAX;
77
    }
78
255145
    return v >> 2;
79
}
80
81
static int decode_run_8bit(GetBitContext *gb, int *color)
82
{
83
    int len;
84
    int has_run = get_bits1(gb);
85
    *color = get_bits(gb, 2 + 6*get_bits1(gb));
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
174
static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256],
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
174
    if (start >= buf_size)
109
        return -1;
110
111

174
    if (w <= 0 || h <= 0)
112
        return -1;
113
114
174
    bit_len = (buf_size - start) * 8;
115
174
    init_get_bits(&gb, buf + start, bit_len);
116
117
174
    x = 0;
118
174
    y = 0;
119
174
    d = bitmap;
120
    for(;;) {
121
296727
        if (get_bits_count(&gb) > bit_len)
122
            return -1;
123
296727
        if (is_8bit)
124
            len = decode_run_8bit(&gb, &color);
125
        else
126
296727
            len = decode_run_2bit(&gb, &color);
127

296727
        if (len != INT_MAX && len > w - x)
128
            return AVERROR_INVALIDDATA;
129
296727
        len = FFMIN(len, w - x);
130
296727
        memset(d + x, color, len);
131
296727
        used_color[color] = 1;
132
296727
        x += len;
133
296727
        if (x >= w) {
134
41582
            y++;
135
41582
            if (y >= h)
136
174
                break;
137
41408
            d += linesize;
138
41408
            x = 0;
139
            /* byte align */
140
41408
            align_get_bits(&gb);
141
        }
142
    }
143
174
    return 0;
144
}
145
146
87
static 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
87
    uint8_t color_used[16] = { 0 };
159
    int nb_opaque_colors, i, level, j, r, g, b;
160
87
    uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
161
162
87
    if(ctx->has_palette) {
163
435
        for(i = 0; i < 4; i++)
164
348
            rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
165
348
                              | ((alpha[i] * 17U) << 24);
166
87
        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
203
87
static void reset_rects(AVSubtitle *sub_header)
204
{
205
    int i;
206
207
87
    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
87
}
217
218
#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
219
220
93
static 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
93
    int big_offsets, offset_size, is_8bit = 0;
225
93
    const uint8_t *yuv_palette = NULL;
226
93
    uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
227
    int date;
228
    int i;
229
93
    int is_menu = 0;
230
    uint32_t size;
231
    int64_t offset1, offset2;
232
233
93
    if (buf_size < 10)
234
        return -1;
235
236
93
    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
93
        big_offsets = 0;
242
93
        offset_size = 2;
243
93
        cmd_pos = 2;
244
    }
245
246

93
    size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
247
93
    cmd_pos = READ_OFFSET(buf + cmd_pos);
248
249

93
    if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {
250
6
        if (cmd_pos > size) {
251
            av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");
252
            return 0;
253
        }
254
6
        return AVERROR(EAGAIN);
255
    }
256
257

173
    while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
258
173
        date = AV_RB16(buf + cmd_pos);
259
173
        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
173
        pos = cmd_pos + 2 + offset_size;
263
173
        offset1 = -1;
264
173
        offset2 = -1;
265
173
        x1 = y1 = x2 = y2 = 0;
266
694
        while (pos < buf_size) {
267
694
            cmd = buf[pos++];
268
            ff_dlog(NULL, "cmd=%02x\n", cmd);
269



694
            switch(cmd) {
270
            case 0x00:
271
                /* menu subpicture */
272
                is_menu = 1;
273
                break;
274
87
            case 0x01:
275
                /* set start date */
276
87
                sub_header->start_display_time = (date << 10) / 90;
277
87
                break;
278
86
            case 0x02:
279
                /* set end date */
280
86
                sub_header->end_display_time = (date << 10) / 90;
281
86
                break;
282
87
            case 0x03:
283
                /* set colormap */
284
87
                if ((buf_size - pos) < 2)
285
                    goto fail;
286
87
                colormap[3] = buf[pos] >> 4;
287
87
                colormap[2] = buf[pos] & 0x0f;
288
87
                colormap[1] = buf[pos + 1] >> 4;
289
87
                colormap[0] = buf[pos + 1] & 0x0f;
290
87
                pos += 2;
291
87
                break;
292
87
            case 0x04:
293
                /* set alpha */
294
87
                if ((buf_size - pos) < 2)
295
                    goto fail;
296
87
                alpha[3] = buf[pos] >> 4;
297
87
                alpha[2] = buf[pos] & 0x0f;
298
87
                alpha[1] = buf[pos + 1] >> 4;
299
87
                alpha[0] = buf[pos + 1] & 0x0f;
300
87
                pos += 2;
301
                ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
302
87
                break;
303
87
            case 0x05:
304
            case 0x85:
305
87
                if ((buf_size - pos) < 6)
306
                    goto fail;
307
87
                x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
308
87
                x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
309
87
                y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
310
87
                y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
311
87
                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
87
                pos += 6;
315
87
                break;
316
87
            case 0x06:
317
87
                if ((buf_size - pos) < 4)
318
                    goto fail;
319
87
                offset1 = AV_RB16(buf + pos);
320
87
                offset2 = AV_RB16(buf + pos + 2);
321
                ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
322
87
                pos += 4;
323
87
                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
173
            case 0xff:
350
173
                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

173
        if (offset1 >= buf_size || offset2 >= buf_size)
358
            goto fail;
359
360

173
        if (offset1 >= 0 && offset2 >= 0) {
361
            int w, h;
362
            uint8_t *bitmap;
363
364
            /* decode the bitmap */
365
87
            w = x2 - x1 + 1;
366
87
            if (w < 0)
367
                w = 0;
368
87
            h = y2 - y1 + 1;
369
87
            if (h < 0)
370
                h = 0;
371

87
            if (w > 0 && h > 1) {
372
87
                reset_rects(sub_header);
373
87
                memset(ctx->used_color, 0, sizeof(ctx->used_color));
374
87
                sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
375
87
                if (!sub_header->rects)
376
                    goto fail;
377
87
                sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
378
87
                if (!sub_header->rects[0])
379
                    goto fail;
380
87
                sub_header->num_rects = 1;
381
87
                bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);
382
87
                if (!bitmap)
383
                    goto fail;
384
87
                if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, ctx->used_color,
385
                               buf, offset1, buf_size, is_8bit) < 0)
386
                    goto fail;
387
87
                if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color,
388
                               buf, offset2, buf_size, is_8bit) < 0)
389
                    goto fail;
390
87
                sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
391
87
                if (!sub_header->rects[0]->data[1])
392
                    goto fail;
393
87
                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
87
                    sub_header->rects[0]->nb_colors = 4;
402
87
                    guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],
403
                                  0xffff00);
404
                }
405
87
                sub_header->rects[0]->x = x1;
406
87
                sub_header->rects[0]->y = y1;
407
87
                sub_header->rects[0]->w = w;
408
87
                sub_header->rects[0]->h = h;
409
87
                sub_header->rects[0]->type = SUBTITLE_BITMAP;
410
87
                sub_header->rects[0]->linesize[0] = w;
411
87
                sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
412
413
#if FF_API_AVPICTURE
414
FF_DISABLE_DEPRECATION_WARNINGS
415
435
                for (i = 0; i < 4; i++) {
416
348
                    sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i];
417
348
                    sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i];
418
                }
419
FF_ENABLE_DEPRECATION_WARNINGS
420
#endif
421
            }
422
        }
423
173
        if (next_cmd_pos < cmd_pos) {
424
            av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");
425
            break;
426
        }
427
173
        if (next_cmd_pos == cmd_pos)
428
87
            break;
429
86
        cmd_pos = next_cmd_pos;
430
    }
431
87
    if (sub_header->num_rects > 0)
432
87
        return is_menu;
433
 fail:
434
    reset_rects(sub_header);
435
    return -1;
436
}
437
438
76353
static int is_transp(const uint8_t *buf, int pitch, int n,
439
                     const uint8_t *transp_color)
440
{
441
    int i;
442
45815197
    for(i = 0; i < n; i++) {
443
45739192
        if (!transp_color[*buf])
444
348
            return 0;
445
45738844
        buf += pitch;
446
    }
447
76005
    return 1;
448
}
449
450
/* return 0 if empty rectangle, 1 if non empty */
451
87
static int find_smallest_bounding_rectangle(DVDSubContext *ctx, AVSubtitle *s)
452
{
453
87
    uint8_t transp_color[256] = { 0 };
454
    int y1, y2, x1, x2, y, w, h, i;
455
    uint8_t *bitmap;
456
87
    int transparent = 1;
457
458


87
    if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
459
        return 0;
460
461
435
    for(i = 0; i < s->rects[0]->nb_colors; i++) {
462
348
        if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0) {
463
174
            transp_color[i] = 1;
464
174
        } else if (ctx->used_color[i])
465
174
            transparent = 0;
466
    }
467
87
    if (transparent)
468
        return 0;
469
87
    y1 = 0;
470

63326
    while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
471
31663
                                  1, s->rects[0]->w, transp_color))
472
31576
        y1++;
473
87
    if (y1 == s->rects[0]->h) {
474
        av_freep(&s->rects[0]->data[0]);
475
        s->rects[0]->w = s->rects[0]->h = 0;
476
        return 0;
477
    }
478
479
87
    y2 = s->rects[0]->h - 1;
480

13864
    while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,
481
6932
                               s->rects[0]->w, transp_color))
482
6845
        y2--;
483
87
    x1 = 0;
484

37626
    while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],
485
18813
                                        s->rects[0]->h, transp_color))
486
18726
        x1++;
487
87
    x2 = s->rects[0]->w - 1;
488

18945
    while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,
489
                                  transp_color))
490
18858
        x2--;
491
87
    w = x2 - x1 + 1;
492
87
    h = y2 - y1 + 1;
493
87
    bitmap = av_malloc(w * h);
494
87
    if (!bitmap)
495
        return 1;
496
3248
    for(y = 0; y < h; y++) {
497
3161
        memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);
498
    }
499
87
    av_freep(&s->rects[0]->data[0]);
500
87
    s->rects[0]->data[0] = bitmap;
501
87
    s->rects[0]->linesize[0] = w;
502
87
    s->rects[0]->w = w;
503
87
    s->rects[0]->h = h;
504
87
    s->rects[0]->x += x1;
505
87
    s->rects[0]->y += y1;
506
507
#if FF_API_AVPICTURE
508
FF_DISABLE_DEPRECATION_WARNINGS
509
435
    for (i = 0; i < 4; i++) {
510
348
        s->rects[0]->pict.data[i] = s->rects[0]->data[i];
511
348
        s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];
512
    }
513
FF_ENABLE_DEPRECATION_WARNINGS
514
#endif
515
516
87
    return 1;
517
}
518
519
#ifdef DEBUG
520
#define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)
521
static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
522
                     uint32_t *rgba_palette)
523
{
524
    int x, y, alpha;
525
    uint32_t v;
526
    int back[3] = {0, 255, 0};  /* green background */
527
    FILE *f;
528
529
    f = fopen(filename, "w");
530
    if (!f) {
531
        perror(filename);
532
        return;
533
    }
534
    fprintf(f, "P6\n"
535
            "%d %d\n"
536
            "%d\n",
537
            w, h, 255);
538
    for(y = 0; y < h; y++) {
539
        for(x = 0; x < w; x++) {
540
            v = rgba_palette[bitmap[y * w + x]];
541
            alpha = v >> 24;
542
            putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
543
            putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
544
            putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);
545
        }
546
    }
547
    fclose(f);
548
}
549
#endif
550
551
12
static int append_to_cached_buf(AVCodecContext *avctx,
552
                                const uint8_t *buf, int buf_size)
553
{
554
12
    DVDSubContext *ctx = avctx->priv_data;
555
556

12
    av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf));
557
12
    if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) {
558
        av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
559
               "too large SPU packets aborted.\n");
560
        ctx->buf_size = 0;
561
        return AVERROR_INVALIDDATA;
562
    }
563
12
    memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
564
12
    ctx->buf_size += buf_size;
565
12
    return 0;
566
}
567
568
93
static int dvdsub_decode(AVCodecContext *avctx,
569
                         void *data, int *data_size,
570
                         AVPacket *avpkt)
571
{
572
93
    DVDSubContext *ctx = avctx->priv_data;
573
93
    const uint8_t *buf = avpkt->data;
574
93
    int buf_size = avpkt->size;
575
93
    AVSubtitle *sub = data;
576
93
    int appended = 0;
577
    int is_menu;
578
579
93
    if (ctx->buf_size) {
580
6
        int ret = append_to_cached_buf(avctx, buf, buf_size);
581
6
        if (ret < 0) {
582
            *data_size = 0;
583
            return ret;
584
        }
585
6
        buf = ctx->buf;
586
6
        buf_size = ctx->buf_size;
587
6
        appended = 1;
588
    }
589
590
93
    is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
591
93
    if (is_menu == AVERROR(EAGAIN)) {
592
6
        *data_size = 0;
593
6
        return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);
594
    }
595
596
87
    if (is_menu < 0) {
597
        ctx->buf_size = 0;
598
    no_subtitle:
599
        reset_rects(sub);
600
        *data_size = 0;
601
602
        return buf_size;
603
    }
604

87
    if (!is_menu && find_smallest_bounding_rectangle(ctx, sub) == 0)
605
        goto no_subtitle;
606
607

87
    if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))
608
        goto no_subtitle;
609
610
#if defined(DEBUG)
611
    {
612
    char ppm_name[32];
613
614
    snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);
615
    ff_dlog(NULL, "start=%d ms end =%d ms\n",
616
            sub->start_display_time,
617
            sub->end_display_time);
618
    ppm_save(ppm_name, sub->rects[0]->data[0],
619
             sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]);
620
    }
621
#endif
622
623
87
    ctx->buf_size = 0;
624
87
    *data_size = 1;
625
87
    return buf_size;
626
}
627
628
static int parse_ifo_palette(DVDSubContext *ctx, char *p)
629
{
630
    FILE *ifo;
631
    char ifostr[12];
632
    uint32_t sp_pgci, pgci, off_pgc, pgc;
633
    uint8_t r, g, b, yuv[65], *buf;
634
    int i, y, cb, cr, r_add, g_add, b_add;
635
    int ret = 0;
636
    const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
637
638
    ctx->has_palette = 0;
639
    if ((ifo = fopen(p, "r")) == NULL) {
640
        av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));
641
        return AVERROR_EOF;
642
    }
643
    if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
644
        av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
645
        ret = AVERROR_INVALIDDATA;
646
        goto end;
647
    }
648
    if (fseek(ifo, 0xCC, SEEK_SET) == -1) {
649
        ret = AVERROR(errno);
650
        goto end;
651
    }
652
    if (fread(&sp_pgci, 4, 1, ifo) == 1) {
653
        pgci = av_be2ne32(sp_pgci) * 2048;
654
        if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {
655
            ret = AVERROR(errno);
656
            goto end;
657
        }
658
        if (fread(&off_pgc, 4, 1, ifo) == 1) {
659
            pgc = pgci + av_be2ne32(off_pgc);
660
            if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {
661
                ret = AVERROR(errno);
662
                goto end;
663
            }
664
            if (fread(yuv, 64, 1, ifo) == 1) {
665
                buf = yuv;
666
                for(i=0; i<16; i++) {
667
                    y  = *++buf;
668
                    cr = *++buf;
669
                    cb = *++buf;
670
                    YUV_TO_RGB1_CCIR(cb, cr);
671
                    YUV_TO_RGB2_CCIR(r, g, b, y);
672
                    ctx->palette[i] = (r << 16) + (g << 8) + b;
673
                    buf++;
674
                }
675
                ctx->has_palette = 1;
676
            }
677
        }
678
    }
679
    if (ctx->has_palette == 0) {
680
        av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
681
        ret = AVERROR_INVALIDDATA;
682
    }
683
end:
684
    fclose(ifo);
685
    return ret;
686
}
687
688
11
static int dvdsub_parse_extradata(AVCodecContext *avctx)
689
{
690
11
    DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
691
    char *dataorig, *data;
692
11
    int ret = 1;
693
694

11
    if (!avctx->extradata || !avctx->extradata_size)
695
2
        return 1;
696
697
9
    dataorig = data = av_malloc(avctx->extradata_size+1);
698
9
    if (!data)
699
        return AVERROR(ENOMEM);
700
9
    memcpy(data, avctx->extradata, avctx->extradata_size);
701
9
    data[avctx->extradata_size] = '\0';
702
703
67
    for(;;) {
704
76
        int pos = strcspn(data, "\n\r");
705

76
        if (pos==0 && *data==0)
706
9
            break;
707
708
67
        if (strncmp("palette:", data, 8) == 0) {
709
9
            ctx->has_palette = 1;
710
9
            ff_dvdsub_parse_palette(ctx->palette, data + 8);
711
58
        } else if (strncmp("size:", data, 5) == 0) {
712
            int w, h;
713
9
            if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
714
9
               ret = ff_set_dimensions(avctx, w, h);
715
9
               if (ret < 0)
716
                   goto fail;
717
            }
718
        }
719
720
67
        data += pos;
721
67
        data += strspn(data, "\n\r");
722
    }
723
724
9
fail:
725
9
    av_free(dataorig);
726
9
    return ret;
727
}
728
729
11
static av_cold int dvdsub_init(AVCodecContext *avctx)
730
{
731
11
    DVDSubContext *ctx = avctx->priv_data;
732
    int ret;
733
734
11
    if ((ret = dvdsub_parse_extradata(avctx)) < 0)
735
        return ret;
736
737
11
    if (ctx->ifo_str)
738
        parse_ifo_palette(ctx, ctx->ifo_str);
739
11
    if (ctx->palette_str) {
740
        ctx->has_palette = 1;
741
        ff_dvdsub_parse_palette(ctx->palette, ctx->palette_str);
742
    }
743
11
    if (ctx->has_palette) {
744
        int i;
745
9
        av_log(avctx, AV_LOG_DEBUG, "palette:");
746
153
        for(i=0;i<16;i++)
747
144
            av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]);
748
9
        av_log(avctx, AV_LOG_DEBUG, "\n");
749
    }
750
751
11
    return 1;
752
}
753
754
11
static void dvdsub_flush(AVCodecContext *avctx)
755
{
756
11
    DVDSubContext *ctx = avctx->priv_data;
757
11
    ctx->buf_size = 0;
758
11
}
759
760
11
static av_cold int dvdsub_close(AVCodecContext *avctx)
761
{
762
11
    dvdsub_flush(avctx);
763
11
    return 0;
764
}
765
766
#define OFFSET(field) offsetof(DVDSubContext, field)
767
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
768
static const AVOption options[] = {
769
    { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
770
    { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
771
    { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
772
    { NULL }
773
};
774
static const AVClass dvdsub_class = {
775
    .class_name = "dvdsubdec",
776
    .item_name  = av_default_item_name,
777
    .option     = options,
778
    .version    = LIBAVUTIL_VERSION_INT,
779
};
780
781
AVCodec ff_dvdsub_decoder = {
782
    .name           = "dvdsub",
783
    .long_name      = NULL_IF_CONFIG_SMALL("DVD subtitles"),
784
    .type           = AVMEDIA_TYPE_SUBTITLE,
785
    .id             = AV_CODEC_ID_DVD_SUBTITLE,
786
    .priv_data_size = sizeof(DVDSubContext),
787
    .init           = dvdsub_init,
788
    .decode         = dvdsub_decode,
789
    .flush          = dvdsub_flush,
790
    .close          = dvdsub_close,
791
    .priv_class     = &dvdsub_class,
792
};