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ffmpeg / libavcodec / dvbsubdec.c @ 5509bffa

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1
/*
2
 * DVB subtitle decoding for ffmpeg
3
 * Copyright (c) 2005 Ian Caulfield.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
 */
19
#include "avcodec.h"
20
#include "dsputil.h"
21
#include "bitstream.h"
22

    
23
//#define DEBUG
24
//#define DEBUG_PACKET_CONTENTS
25
//#define DEBUG_SAVE_IMAGES
26

    
27
#define DVBSUB_PAGE_SEGMENT     0x10
28
#define DVBSUB_REGION_SEGMENT   0x11
29
#define DVBSUB_CLUT_SEGMENT     0x12
30
#define DVBSUB_OBJECT_SEGMENT   0x13
31
#define DVBSUB_DISPLAY_SEGMENT  0x80
32

    
33
static unsigned char *cm;
34

    
35
#ifdef DEBUG_SAVE_IMAGES
36
#undef fprintf
37
#if 0
38
static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
39
                     uint32_t *rgba_palette)
40
{
41
    int x, y, v;
42
    FILE *f;
43
    char fname[40], fname2[40];
44
    char command[1024];
45

46
    snprintf(fname, 40, "%s.ppm", filename);
47

48
    f = fopen(fname, "w");
49
    if (!f) {
50
        perror(fname);
51
        exit(1);
52
    }
53
    fprintf(f, "P6\n"
54
            "%d %d\n"
55
            "%d\n",
56
            w, h, 255);
57
    for(y = 0; y < h; y++) {
58
        for(x = 0; x < w; x++) {
59
            v = rgba_palette[bitmap[y * w + x]];
60
            putc((v >> 16) & 0xff, f);
61
            putc((v >> 8) & 0xff, f);
62
            putc((v >> 0) & 0xff, f);
63
        }
64
    }
65
    fclose(f);
66

67

68
    snprintf(fname2, 40, "%s-a.pgm", filename);
69

70
    f = fopen(fname2, "w");
71
    if (!f) {
72
        perror(fname2);
73
        exit(1);
74
    }
75
    fprintf(f, "P5\n"
76
            "%d %d\n"
77
            "%d\n",
78
            w, h, 255);
79
    for(y = 0; y < h; y++) {
80
        for(x = 0; x < w; x++) {
81
            v = rgba_palette[bitmap[y * w + x]];
82
            putc((v >> 24) & 0xff, f);
83
        }
84
    }
85
    fclose(f);
86

87
    snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
88
    system(command);
89

90
    snprintf(command, 1024, "rm %s %s", fname, fname2);
91
    system(command);
92
}
93
#endif
94

    
95
static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
96
{
97
    int x, y, v;
98
    FILE *f;
99
    char fname[40], fname2[40];
100
    char command[1024];
101

    
102
    snprintf(fname, 40, "%s.ppm", filename);
103

    
104
    f = fopen(fname, "w");
105
    if (!f) {
106
        perror(fname);
107
        exit(1);
108
    }
109
    fprintf(f, "P6\n"
110
            "%d %d\n"
111
            "%d\n",
112
            w, h, 255);
113
    for(y = 0; y < h; y++) {
114
        for(x = 0; x < w; x++) {
115
            v = bitmap[y * w + x];
116
            putc((v >> 16) & 0xff, f);
117
            putc((v >> 8) & 0xff, f);
118
            putc((v >> 0) & 0xff, f);
119
        }
120
    }
121
    fclose(f);
122

    
123

    
124
    snprintf(fname2, 40, "%s-a.pgm", filename);
125

    
126
    f = fopen(fname2, "w");
127
    if (!f) {
128
        perror(fname2);
129
        exit(1);
130
    }
131
    fprintf(f, "P5\n"
132
            "%d %d\n"
133
            "%d\n",
134
            w, h, 255);
135
    for(y = 0; y < h; y++) {
136
        for(x = 0; x < w; x++) {
137
            v = bitmap[y * w + x];
138
            putc((v >> 24) & 0xff, f);
139
        }
140
    }
141
    fclose(f);
142

    
143
    snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
144
    system(command);
145

    
146
    snprintf(command, 1024, "rm %s %s", fname, fname2);
147
    system(command);
148
}
149
#endif
150

    
151
#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
152

    
153
typedef struct DVBSubCLUT {
154
    int id;
155

    
156
    uint32_t clut4[4];
157
    uint32_t clut16[16];
158
    uint32_t clut256[256];
159

    
160
    struct DVBSubCLUT *next;
161
} DVBSubCLUT;
162

    
163
static DVBSubCLUT default_clut;
164

    
165
typedef struct DVBSubObjectDisplay {
166
    int object_id;
167
    int region_id;
168

    
169
    int x_pos;
170
    int y_pos;
171

    
172
    int fgcolour;
173
    int bgcolour;
174

    
175
    struct DVBSubObjectDisplay *region_list_next;
176
    struct DVBSubObjectDisplay *object_list_next;
177
} DVBSubObjectDisplay;
178

    
179
typedef struct DVBSubObject {
180
    int id;
181

    
182
    int type;
183

    
184
    DVBSubObjectDisplay *display_list;
185

    
186
    struct DVBSubObject *next;
187
} DVBSubObject;
188

    
189
typedef struct DVBSubRegionDisplay {
190
    int region_id;
191

    
192
    int x_pos;
193
    int y_pos;
194

    
195
    struct DVBSubRegionDisplay *next;
196
} DVBSubRegionDisplay;
197

    
198
typedef struct DVBSubRegion {
199
    int id;
200

    
201
    int width;
202
    int height;
203
    int depth;
204

    
205
    int clut;
206
    int bgcolour;
207

    
208
    uint8_t *pbuf;
209
    int buf_size;
210

    
211
    DVBSubObjectDisplay *display_list;
212

    
213
    struct DVBSubRegion *next;
214
} DVBSubRegion;
215

    
216
typedef struct DVBSubContext {
217
    int composition_id;
218
    int ancillary_id;
219

    
220
    int time_out;
221
    DVBSubRegion *region_list;
222
    DVBSubCLUT   *clut_list;
223
    DVBSubObject *object_list;
224

    
225
    int display_list_size;
226
    DVBSubRegionDisplay *display_list;
227
} DVBSubContext;
228

    
229

    
230
static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
231
{
232
    DVBSubObject *ptr = ctx->object_list;
233

    
234
    while (ptr != NULL && ptr->id != object_id) {
235
        ptr = ptr->next;
236
    }
237

    
238
    return ptr;
239
}
240

    
241
static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
242
{
243
    DVBSubCLUT *ptr = ctx->clut_list;
244

    
245
    while (ptr != NULL && ptr->id != clut_id) {
246
        ptr = ptr->next;
247
    }
248

    
249
    return ptr;
250
}
251

    
252
static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
253
{
254
    DVBSubRegion *ptr = ctx->region_list;
255

    
256
    while (ptr != NULL && ptr->id != region_id) {
257
        ptr = ptr->next;
258
    }
259

    
260
    return ptr;
261
}
262

    
263
static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
264
{
265
    DVBSubObject *object, *obj2, **obj2_ptr;
266
    DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
267

    
268
    while (region->display_list != NULL) {
269
        display = region->display_list;
270

    
271
        object = get_object(ctx, display->object_id);
272

    
273
        if (object != NULL) {
274
            obj_disp = object->display_list;
275
            obj_disp_ptr = &object->display_list;
276

    
277
            while (obj_disp != NULL && obj_disp != display) {
278
                obj_disp_ptr = &obj_disp->object_list_next;
279
                obj_disp = obj_disp->object_list_next;
280
            }
281

    
282
            if (obj_disp) {
283
                *obj_disp_ptr = obj_disp->object_list_next;
284

    
285
                if (object->display_list == NULL) {
286
                    obj2 = ctx->object_list;
287
                    obj2_ptr = &ctx->object_list;
288

    
289
                    while (obj2 != NULL && obj2 != object) {
290
                        obj2_ptr = &obj2->next;
291
                        obj2 = obj2->next;
292
                    }
293

    
294
                    *obj2_ptr = obj2->next;
295

    
296
                    av_free(obj2);
297
                }
298
            }
299
        }
300

    
301
        region->display_list = display->region_list_next;
302

    
303
        av_free(display);
304
    }
305

    
306
}
307

    
308
static void delete_state(DVBSubContext *ctx)
309
{
310
    DVBSubRegion *region;
311
    DVBSubCLUT *clut;
312

    
313
    while (ctx->region_list != NULL)
314
    {
315
        region = ctx->region_list;
316

    
317
        ctx->region_list = region->next;
318

    
319
        delete_region_display_list(ctx, region);
320
        if (region->pbuf != NULL)
321
            av_free(region->pbuf);
322

    
323
        av_free(region);
324
    }
325

    
326
    while (ctx->clut_list != NULL)
327
    {
328
        clut = ctx->clut_list;
329

    
330
        ctx->clut_list = clut->next;
331

    
332
        av_free(clut);
333
    }
334

    
335
    /* Should already be null */
336
    if (ctx->object_list != NULL)
337
        av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
338
}
339

    
340
static int dvbsub_init_decoder(AVCodecContext *avctx)
341
{
342
    int i, r, g, b, a = 0;
343
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
344

    
345
    cm = cropTbl + MAX_NEG_CROP;
346

    
347
    memset(avctx->priv_data, 0, sizeof(DVBSubContext));
348

    
349
    ctx->composition_id = avctx->sub_id & 0xffff;
350
    ctx->ancillary_id = avctx->sub_id >> 16;
351

    
352
    default_clut.id = -1;
353
    default_clut.next = NULL;
354

    
355
    default_clut.clut4[0] = RGBA(  0,   0,   0,   0);
356
    default_clut.clut4[1] = RGBA(255, 255, 255, 255);
357
    default_clut.clut4[2] = RGBA(  0,   0,   0, 255);
358
    default_clut.clut4[3] = RGBA(127, 127, 127, 255);
359

    
360
    default_clut.clut16[0] = RGBA(  0,   0,   0,   0);
361
    for (i = 1; i < 16; i++) {
362
        if (i < 8) {
363
            r = (i & 1) ? 255 : 0;
364
            g = (i & 2) ? 255 : 0;
365
            b = (i & 4) ? 255 : 0;
366
        } else {
367
            r = (i & 1) ? 127 : 0;
368
            g = (i & 2) ? 127 : 0;
369
            b = (i & 4) ? 127 : 0;
370
        }
371
        default_clut.clut16[i] = RGBA(r, g, b, 255);
372
    }
373

    
374
    default_clut.clut256[0] = RGBA(  0,   0,   0,   0);
375
    for (i = 1; i < 256; i++) {
376
        if (i < 8) {
377
            r = (i & 1) ? 255 : 0;
378
            g = (i & 2) ? 255 : 0;
379
            b = (i & 4) ? 255 : 0;
380
            a = 63;
381
        } else {
382
            switch (i & 0x88) {
383
            case 0x00:
384
                r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
385
                g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
386
                b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
387
                a = 255;
388
                break;
389
            case 0x08:
390
                r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
391
                g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
392
                b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
393
                a = 127;
394
                break;
395
            case 0x80:
396
                r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
397
                g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
398
                b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
399
                a = 255;
400
                break;
401
            case 0x88:
402
                r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
403
                g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
404
                b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
405
                a = 255;
406
                break;
407
            }
408
        }
409
        default_clut.clut256[i] = RGBA(r, g, b, a);
410
    }
411

    
412
    return 0;
413
}
414

    
415
static int dvbsub_close_decoder(AVCodecContext *avctx)
416
{
417
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
418
    DVBSubRegionDisplay *display;
419

    
420
    delete_state(ctx);
421

    
422
    while (ctx->display_list != NULL)
423
    {
424
        display = ctx->display_list;
425
        ctx->display_list = display->next;
426

    
427
        av_free(display);
428
    }
429

    
430
    return 0;
431
}
432

    
433
static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
434
                                   uint8_t **srcbuf, int buf_size,
435
                                   int non_mod, uint8_t *map_table)
436
{
437
    GetBitContext gb;
438

    
439
    int bits;
440
    int run_length;
441
    int pixels_read = 0;
442

    
443
    init_get_bits(&gb, *srcbuf, buf_size << 8);
444

    
445
    while (get_bits_count(&gb) < (buf_size << 8) && pixels_read < dbuf_len) {
446
        bits = get_bits(&gb, 2);
447

    
448
        if (bits != 0) {
449
            if (non_mod != 1 || bits != 1) {
450
                if (map_table != NULL)
451
                    *destbuf++ = map_table[bits];
452
                else
453
                    *destbuf++ = bits;
454
            }
455
            pixels_read++;
456
        } else {
457
            bits = get_bits(&gb, 1);
458
            if (bits == 1) {
459
                run_length = get_bits(&gb, 3) + 3;
460
                bits = get_bits(&gb, 2);
461

    
462
                if (non_mod == 1 && bits == 1)
463
                    pixels_read += run_length;
464
                else {
465
                    if (map_table != NULL)
466
                        bits = map_table[bits];
467
                    while (run_length-- > 0 && pixels_read < dbuf_len) {
468
                        *destbuf++ = bits;
469
                        pixels_read++;
470
                    }
471
                }
472
            } else {
473
                bits = get_bits(&gb, 1);
474
                if (bits == 0) {
475
                    bits = get_bits(&gb, 2);
476
                    if (bits == 2) {
477
                        run_length = get_bits(&gb, 4) + 12;
478
                        bits = get_bits(&gb, 2);
479

    
480
                        if (non_mod == 1 && bits == 1)
481
                            pixels_read += run_length;
482
                        else {
483
                            if (map_table != NULL)
484
                                bits = map_table[bits];
485
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
486
                                *destbuf++ = bits;
487
                                pixels_read++;
488
                            }
489
                        }
490
                    } else if (bits == 3) {
491
                        run_length = get_bits(&gb, 8) + 29;
492
                        bits = get_bits(&gb, 2);
493

    
494
                        if (non_mod == 1 && bits == 1)
495
                            pixels_read += run_length;
496
                        else {
497
                            if (map_table != NULL)
498
                                bits = map_table[bits];
499
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
500
                                *destbuf++ = bits;
501
                                pixels_read++;
502
                            }
503
                        }
504
                    } else if (bits == 1) {
505
                        pixels_read += 2;
506
                        if (map_table != NULL)
507
                            bits = map_table[0];
508
                        else
509
                            bits = 0;
510
                        if (pixels_read <= dbuf_len) {
511
                            *destbuf++ = bits;
512
                            *destbuf++ = bits;
513
                        }
514
                    } else {
515
                        (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
516
                        return pixels_read;
517
                    }
518
                } else {
519
                    if (map_table != NULL)
520
                        bits = map_table[0];
521
                    else
522
                        bits = 0;
523
                    *destbuf++ = bits;
524
                    pixels_read++;
525
                }
526
            }
527
        }
528
    }
529

    
530
    if (get_bits(&gb, 6) != 0)
531
        av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
532

    
533
    (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
534

    
535
    return pixels_read;
536
}
537

    
538
static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
539
                                   uint8_t **srcbuf, int buf_size,
540
                                   int non_mod, uint8_t *map_table)
541
{
542
    GetBitContext gb;
543

    
544
    int bits;
545
    int run_length;
546
    int pixels_read = 0;
547

    
548
    init_get_bits(&gb, *srcbuf, buf_size << 8);
549

    
550
    while (get_bits_count(&gb) < (buf_size << 8) && pixels_read < dbuf_len) {
551
        bits = get_bits(&gb, 4);
552

    
553
        if (bits != 0) {
554
            if (non_mod != 1 || bits != 1) {
555
                if (map_table != NULL)
556
                    *destbuf++ = map_table[bits];
557
                else
558
                    *destbuf++ = bits;
559
            }
560
            pixels_read++;
561
        } else {
562
            bits = get_bits(&gb, 1);
563
            if (bits == 0) {
564
                run_length = get_bits(&gb, 3);
565

    
566
                if (run_length == 0) {
567
                    (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
568
                    return pixels_read;
569
                }
570

    
571
                run_length += 2;
572

    
573
                if (map_table != NULL)
574
                    bits = map_table[0];
575
                else
576
                    bits = 0;
577

    
578
                while (run_length-- > 0 && pixels_read < dbuf_len) {
579
                    *destbuf++ = bits;
580
                    pixels_read++;
581
                }
582
            } else {
583
                bits = get_bits(&gb, 1);
584
                if (bits == 0) {
585
                    run_length = get_bits(&gb, 2) + 4;
586
                    bits = get_bits(&gb, 4);
587

    
588
                    if (non_mod == 1 && bits == 1)
589
                        pixels_read += run_length;
590
                    else {
591
                        if (map_table != NULL)
592
                            bits = map_table[bits];
593
                        while (run_length-- > 0 && pixels_read < dbuf_len) {
594
                            *destbuf++ = bits;
595
                            pixels_read++;
596
                        }
597
                    }
598
                } else {
599
                    bits = get_bits(&gb, 2);
600
                    if (bits == 2) {
601
                        run_length = get_bits(&gb, 4) + 9;
602
                        bits = get_bits(&gb, 4);
603

    
604
                        if (non_mod == 1 && bits == 1)
605
                            pixels_read += run_length;
606
                        else {
607
                            if (map_table != NULL)
608
                                bits = map_table[bits];
609
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
610
                                *destbuf++ = bits;
611
                                pixels_read++;
612
                            }
613
                        }
614
                    } else if (bits == 3) {
615
                        run_length = get_bits(&gb, 8) + 25;
616
                        bits = get_bits(&gb, 4);
617

    
618
                        if (non_mod == 1 && bits == 1)
619
                            pixels_read += run_length;
620
                        else {
621
                            if (map_table != NULL)
622
                                bits = map_table[bits];
623
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
624
                                *destbuf++ = bits;
625
                                pixels_read++;
626
                            }
627
                        }
628
                    } else if (bits == 1) {
629
                        pixels_read += 2;
630
                        if (map_table != NULL)
631
                            bits = map_table[0];
632
                        else
633
                            bits = 0;
634
                        if (pixels_read <= dbuf_len) {
635
                            *destbuf++ = bits;
636
                            *destbuf++ = bits;
637
                        }
638
                    } else {
639
                        if (map_table != NULL)
640
                            bits = map_table[0];
641
                        else
642
                            bits = 0;
643
                        *destbuf++ = bits;
644
                        pixels_read ++;
645
                    }
646
                }
647
            }
648
        }
649
    }
650

    
651
    if (get_bits(&gb, 8) != 0)
652
        av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
653

    
654
    (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
655

    
656
    return pixels_read;
657
}
658

    
659
static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
660
                                    uint8_t **srcbuf, int buf_size,
661
                                    int non_mod, uint8_t *map_table)
662
{
663
    uint8_t *sbuf_end = (*srcbuf) + buf_size;
664
    int bits;
665
    int run_length;
666
    int pixels_read = 0;
667

    
668
    while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
669
        bits = *(*srcbuf)++;
670

    
671
        if (bits != 0) {
672
            if (non_mod != 1 || bits != 1) {
673
                if (map_table != NULL)
674
                    *destbuf++ = map_table[bits];
675
                else
676
                    *destbuf++ = bits;
677
            }
678
            pixels_read++;
679
        } else {
680
            bits = *(*srcbuf)++;
681
            run_length = bits & 0x7f;
682
            if ((bits & 0x80) == 0) {
683
                if (run_length == 0) {
684
                    return pixels_read;
685
                }
686

    
687
                if (map_table != NULL)
688
                    bits = map_table[0];
689
                else
690
                    bits = 0;
691
                while (run_length-- > 0 && pixels_read < dbuf_len) {
692
                    *destbuf++ = bits;
693
                    pixels_read++;
694
                }
695
            } else {
696
                bits = *(*srcbuf)++;
697

    
698
                if (non_mod == 1 && bits == 1)
699
                    pixels_read += run_length;
700
                if (map_table != NULL)
701
                    bits = map_table[bits];
702
                else while (run_length-- > 0 && pixels_read < dbuf_len) {
703
                    *destbuf++ = bits;
704
                    pixels_read++;
705
                }
706
            }
707
        }
708
    }
709

    
710
    if (*(*srcbuf)++ != 0)
711
        av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
712

    
713
    return pixels_read;
714
}
715

    
716

    
717

    
718
static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
719
                                          uint8_t *buf, int buf_size, int top_bottom, int non_mod)
720
{
721
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
722

    
723
    DVBSubRegion *region = get_region(ctx, display->region_id);
724
    uint8_t *buf_end = buf + buf_size;
725
    uint8_t *pbuf;
726
    int x_pos, y_pos;
727
    int i;
728

    
729
    uint8_t map2to4[] = { 0x0,  0x7,  0x8,  0xf};
730
    uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
731
    uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
732
                         0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
733
    uint8_t *map_table;
734

    
735
#ifdef DEBUG
736
    av_log(avctx, AV_LOG_INFO, "DVB pixel block size %d, %s field:\n", buf_size,
737
                top_bottom ? "bottom" : "top");
738
#endif
739

    
740
#ifdef DEBUG_PACKET_CONTENTS
741
    for (i = 0; i < buf_size; i++)
742
    {
743
        if (i % 16 == 0)
744
            av_log(avctx, AV_LOG_INFO, "0x%08p: ", buf+i);
745

    
746
        av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
747
        if (i % 16 == 15)
748
            av_log(avctx, AV_LOG_INFO, "\n");
749
    }
750

    
751
    if (i % 16 != 0)
752
        av_log(avctx, AV_LOG_INFO, "\n");
753

    
754
#endif
755

    
756
    if (region == 0)
757
        return;
758

    
759
    pbuf = region->pbuf;
760

    
761
    x_pos = display->x_pos;
762
    y_pos = display->y_pos;
763

    
764
    if ((y_pos & 1) != top_bottom)
765
        y_pos++;
766

    
767
    while (buf < buf_end) {
768
        if (x_pos > region->width || y_pos > region->height) {
769
            av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
770
            return;
771
        }
772

    
773
        switch (*buf++) {
774
        case 0x10:
775
            if (region->depth == 8)
776
                map_table = map2to8;
777
            else if (region->depth == 4)
778
                map_table = map2to4;
779
            else
780
                map_table = NULL;
781

    
782
            x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
783
                                                region->width - x_pos, &buf, buf_size,
784
                                                non_mod, map_table);
785
            break;
786
        case 0x11:
787
            if (region->depth < 4) {
788
                av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
789
                return;
790
            }
791

    
792
            if (region->depth == 8)
793
                map_table = map4to8;
794
            else
795
                map_table = NULL;
796

    
797
            x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
798
                                                region->width - x_pos, &buf, buf_size,
799
                                                non_mod, map_table);
800
            break;
801
        case 0x12:
802
            if (region->depth < 8) {
803
                av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
804
                return;
805
            }
806

    
807
            x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
808
                                                region->width - x_pos, &buf, buf_size,
809
                                                non_mod, NULL);
810
            break;
811

    
812
        case 0x20:
813
            map2to4[0] = (*buf) >> 4;
814
            map2to4[1] = (*buf++) & 0xf;
815
            map2to4[2] = (*buf) >> 4;
816
            map2to4[3] = (*buf++) & 0xf;
817
            break;
818
        case 0x21:
819
            for (i = 0; i < 4; i++)
820
                map2to8[i] = *buf++;
821
            break;
822
        case 0x22:
823
            for (i = 0; i < 16; i++)
824
                map4to8[i] = *buf++;
825
            break;
826

    
827
        case 0xf0:
828
            x_pos = display->x_pos;
829
            y_pos += 2;
830
            break;
831
        default:
832
            av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
833
        }
834
    }
835

    
836
}
837

    
838
static void dvbsub_parse_object_segment(AVCodecContext *avctx,
839
                                        uint8_t *buf, int buf_size)
840
{
841
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
842

    
843
    uint8_t *buf_end = buf + buf_size;
844
    uint8_t *block;
845
    int object_id;
846
    DVBSubObject *object;
847
    DVBSubObjectDisplay *display;
848
    int top_field_len, bottom_field_len;
849

    
850
    int coding_method, non_modifying_colour;
851

    
852
    object_id = BE_16(buf);
853
    buf += 2;
854

    
855
    object = get_object(ctx, object_id);
856

    
857
    if (!object)
858
        return;
859

    
860
    coding_method = ((*buf) >> 2) & 3;
861
    non_modifying_colour = ((*buf++) >> 1) & 1;
862

    
863
    if (coding_method == 0) {
864
        top_field_len = BE_16(buf);
865
        buf += 2;
866
        bottom_field_len = BE_16(buf);
867
        buf += 2;
868

    
869
        if (buf + top_field_len + bottom_field_len > buf_end) {
870
            av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
871
            return;
872
        }
873

    
874
        for (display = object->display_list; display != 0; display = display->object_list_next) {
875
            block = buf;
876

    
877
            dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
878
                                            non_modifying_colour);
879

    
880
            if (bottom_field_len > 0)
881
                block = buf + top_field_len;
882
            else
883
                bottom_field_len = top_field_len;
884

    
885
            dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
886
                                            non_modifying_colour);
887
        }
888

    
889
/*  } else if (coding_method == 1) {*/
890

    
891
    } else {
892
        av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
893
    }
894

    
895
}
896

    
897
#define SCALEBITS 10
898
#define ONE_HALF  (1 << (SCALEBITS - 1))
899
#define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
900

    
901
#define YUV_TO_RGB1_CCIR(cb1, cr1)\
902
{\
903
    cb = (cb1) - 128;\
904
    cr = (cr1) - 128;\
905
    r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
906
    g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
907
            ONE_HALF;\
908
    b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
909
}
910

    
911
#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
912
{\
913
    y = ((y1) - 16) * FIX(255.0/219.0);\
914
    r = cm[(y + r_add) >> SCALEBITS];\
915
    g = cm[(y + g_add) >> SCALEBITS];\
916
    b = cm[(y + b_add) >> SCALEBITS];\
917
}
918

    
919

    
920
static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
921
                                        uint8_t *buf, int buf_size)
922
{
923
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
924

    
925
    uint8_t *buf_end = buf + buf_size;
926
    int clut_id;
927
    DVBSubCLUT *clut;
928
    int entry_id, depth , full_range;
929
    int y, cr, cb, alpha;
930
    int r, g, b, r_add, g_add, b_add;
931

    
932
#ifdef DEBUG_PACKET_CONTENTS
933
    int i;
934

    
935
    av_log(avctx, AV_LOG_INFO, "DVB clut packet:\n");
936

    
937
    for (i=0; i < buf_size; i++)
938
    {
939
        av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
940
        if (i % 16 == 15)
941
            av_log(avctx, AV_LOG_INFO, "\n");
942
    }
943

    
944
    if (i % 16 != 0)
945
        av_log(avctx, AV_LOG_INFO, "\n");
946

    
947
#endif
948

    
949
    clut_id = *buf++;
950
    buf += 1;
951

    
952
    clut = get_clut(ctx, clut_id);
953

    
954
    if (clut == NULL) {
955
        clut = av_malloc(sizeof(DVBSubCLUT));
956

    
957
        memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
958

    
959
        clut->id = clut_id;
960

    
961
        clut->next = ctx->clut_list;
962
        ctx->clut_list = clut;
963
    }
964

    
965
    while (buf + 4 < buf_end)
966
    {
967
        entry_id = *buf++;
968

    
969
        depth = (*buf) & 0xe0;
970

    
971
        if (depth == 0) {
972
            av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
973
            return;
974
        }
975

    
976
        full_range = (*buf++) & 1;
977

    
978
        if (full_range) {
979
            y = *buf++;
980
            cr = *buf++;
981
            cb = *buf++;
982
            alpha = *buf++;
983
        } else {
984
            y = buf[0] & 0xfc;
985
            cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
986
            cb = (buf[1] << 2) & 0xf0;
987
            alpha = (buf[1] << 6) & 0xc0;
988

    
989
            buf += 2;
990
        }
991

    
992
        if (y == 0)
993
            alpha = 0xff;
994

    
995
        YUV_TO_RGB1_CCIR(cb, cr);
996
        YUV_TO_RGB2_CCIR(r, g, b, y);
997

    
998
#ifdef DEBUG
999
        av_log(avctx, AV_LOG_INFO, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1000
#endif
1001

    
1002
        if (depth & 0x80)
1003
            clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1004
        if (depth & 0x40)
1005
            clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1006
        if (depth & 0x20)
1007
            clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1008
    }
1009
}
1010

    
1011

    
1012
static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1013
                                        uint8_t *buf, int buf_size)
1014
{
1015
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1016

    
1017
    uint8_t *buf_end = buf + buf_size;
1018
    int region_id, object_id;
1019
    DVBSubRegion *region;
1020
    DVBSubObject *object;
1021
    DVBSubObjectDisplay *display;
1022
    int fill;
1023

    
1024
    if (buf_size < 10)
1025
        return;
1026

    
1027
    region_id = *buf++;
1028

    
1029
    region = get_region(ctx, region_id);
1030

    
1031
    if (region == NULL)
1032
    {
1033
        region = av_mallocz(sizeof(DVBSubRegion));
1034

    
1035
        region->id = region_id;
1036

    
1037
        region->next = ctx->region_list;
1038
        ctx->region_list = region;
1039
    }
1040

    
1041
    fill = ((*buf++) >> 3) & 1;
1042

    
1043
    region->width = BE_16(buf);
1044
    buf += 2;
1045
    region->height = BE_16(buf);
1046
    buf += 2;
1047

    
1048
    if (region->width * region->height != region->buf_size) {
1049
        if (region->pbuf != 0)
1050
            av_free(region->pbuf);
1051

    
1052
        region->buf_size = region->width * region->height;
1053

    
1054
        region->pbuf = av_malloc(region->buf_size);
1055

    
1056
        fill = 1;
1057
    }
1058

    
1059
    region->depth = 1 << (((*buf++) >> 2) & 7);
1060
    region->clut = *buf++;
1061

    
1062
    if (region->depth == 8)
1063
        region->bgcolour = *buf++;
1064
    else {
1065
        buf += 1;
1066

    
1067
        if (region->depth == 4)
1068
            region->bgcolour = (((*buf++) >> 4) & 15);
1069
        else
1070
            region->bgcolour = (((*buf++) >> 2) & 3);
1071
    }
1072

    
1073
#ifdef DEBUG
1074
    av_log(avctx, AV_LOG_INFO, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1075
#endif
1076

    
1077
    if (fill) {
1078
        memset(region->pbuf, region->bgcolour, region->buf_size);
1079
#ifdef DEBUG
1080
        av_log(avctx, AV_LOG_INFO, "Fill region (%d)\n", region->bgcolour);
1081
#endif
1082
    }
1083

    
1084
    delete_region_display_list(ctx, region);
1085

    
1086
    while (buf + 5 < buf_end) {
1087
        object_id = BE_16(buf);
1088
        buf += 2;
1089

    
1090
        object = get_object(ctx, object_id);
1091

    
1092
        if (object == NULL) {
1093
            object = av_mallocz(sizeof(DVBSubObject));
1094

    
1095
            object->id = object_id;
1096
            object->next = ctx->object_list;
1097
            ctx->object_list = object;
1098
        }
1099

    
1100
        object->type = (*buf) >> 6;
1101

    
1102
        display = av_mallocz(sizeof(DVBSubObjectDisplay));
1103

    
1104
        display->object_id = object_id;
1105
        display->region_id = region_id;
1106

    
1107
        display->x_pos = BE_16(buf) & 0xfff;
1108
        buf += 2;
1109
        display->y_pos = BE_16(buf) & 0xfff;
1110
        buf += 2;
1111

    
1112
        if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1113
            display->fgcolour = *buf++;
1114
            display->bgcolour = *buf++;
1115
        }
1116

    
1117
        display->region_list_next = region->display_list;
1118
        region->display_list = display;
1119

    
1120
        display->object_list_next = object->display_list;
1121
        object->display_list = display;
1122
    }
1123
}
1124

    
1125
static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1126
                                        uint8_t *buf, int buf_size)
1127
{
1128
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1129
    DVBSubRegionDisplay *display;
1130
    DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1131

    
1132
    uint8_t *buf_end = buf + buf_size;
1133
    int region_id;
1134
    int page_state;
1135

    
1136
    if (buf_size < 1)
1137
        return;
1138

    
1139
    ctx->time_out = *buf++;
1140
    page_state = ((*buf++) >> 2) & 3;
1141

    
1142
#ifdef DEBUG
1143
    av_log(avctx, AV_LOG_INFO, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1144
#endif
1145

    
1146
    if (page_state == 2)
1147
    {
1148
        delete_state(ctx);
1149
    }
1150

    
1151
    tmp_display_list = ctx->display_list;
1152
    ctx->display_list = NULL;
1153
    ctx->display_list_size = 0;
1154

    
1155
    while (buf + 5 < buf_end) {
1156
        region_id = *buf++;
1157
        buf += 1;
1158

    
1159
        display = tmp_display_list;
1160
        tmp_ptr = &tmp_display_list;
1161

    
1162
        while (display != NULL && display->region_id != region_id) {
1163
            tmp_ptr = &display->next;
1164
            display = display->next;
1165
        }
1166

    
1167
        if (display == NULL)
1168
            display = av_mallocz(sizeof(DVBSubRegionDisplay));
1169

    
1170
        display->region_id = region_id;
1171

    
1172
        display->x_pos = BE_16(buf);
1173
        buf += 2;
1174
        display->y_pos = BE_16(buf);
1175
        buf += 2;
1176

    
1177
        *tmp_ptr = display->next;
1178

    
1179
        display->next = ctx->display_list;
1180
        ctx->display_list = display;
1181
        ctx->display_list_size++;
1182

    
1183
#ifdef DEBUG
1184
        av_log(avctx, AV_LOG_INFO, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1185
#endif
1186
    }
1187

    
1188
    while (tmp_display_list != 0) {
1189
        display = tmp_display_list;
1190

    
1191
        tmp_display_list = display->next;
1192

    
1193
        av_free(display);
1194
    }
1195

    
1196
}
1197

    
1198

    
1199
#ifdef DEBUG_SAVE_IMAGES
1200
static void save_display_set(DVBSubContext *ctx)
1201
{
1202
    DVBSubRegion *region;
1203
    DVBSubRegionDisplay *display;
1204
    DVBSubCLUT *clut;
1205
    uint32_t *clut_table;
1206
    int x_pos, y_pos, width, height;
1207
    int x, y, y_off, x_off;
1208
    uint32_t *pbuf;
1209
    char filename[32];
1210
    static int fileno_index = 0;
1211

    
1212
    x_pos = -1;
1213
    y_pos = -1;
1214
    width = 0;
1215
    height = 0;
1216

    
1217
    for (display = ctx->display_list; display != NULL; display = display->next) {
1218
        region = get_region(ctx, display->region_id);
1219

    
1220
        if (x_pos == -1) {
1221
            x_pos = display->x_pos;
1222
            y_pos = display->y_pos;
1223
            width = region->width;
1224
            height = region->height;
1225
        } else {
1226
            if (display->x_pos < x_pos) {
1227
                width += (x_pos - display->x_pos);
1228
                x_pos = display->x_pos;
1229
            }
1230

    
1231
            if (display->y_pos < y_pos) {
1232
                height += (y_pos - display->y_pos);
1233
                y_pos = display->y_pos;
1234
            }
1235

    
1236
            if (display->x_pos + region->width > x_pos + width) {
1237
                width = display->x_pos + region->width - x_pos;
1238
            }
1239

    
1240
            if (display->y_pos + region->height > y_pos + height) {
1241
                height = display->y_pos + region->height - y_pos;
1242
            }
1243
        }
1244
    }
1245

    
1246
    if (x_pos >= 0) {
1247

    
1248
        pbuf = av_malloc(width * height * 4);
1249

    
1250
        for (display = ctx->display_list; display != NULL; display = display->next) {
1251
            region = get_region(ctx, display->region_id);
1252

    
1253
            x_off = display->x_pos - x_pos;
1254
            y_off = display->y_pos - y_pos;
1255

    
1256
            clut = get_clut(ctx, region->clut);
1257

    
1258
            if (clut == 0)
1259
                clut = &default_clut;
1260

    
1261
            switch (region->depth) {
1262
            case 2:
1263
                clut_table = clut->clut4;
1264
                break;
1265
            case 8:
1266
                clut_table = clut->clut256;
1267
                break;
1268
            case 4:
1269
            default:
1270
                clut_table = clut->clut16;
1271
                break;
1272
            }
1273

    
1274
            for (y = 0; y < region->height; y++) {
1275
                for (x = 0; x < region->width; x++) {
1276
                    pbuf[((y + y_off) * width) + x_off + x] =
1277
                        clut_table[region->pbuf[y * region->width + x]];
1278
                }
1279
            }
1280

    
1281
        }
1282

    
1283
        snprintf(filename, 32, "dvbs.%d", fileno_index);
1284

    
1285
        png_save2(filename, pbuf, width, height);
1286

    
1287
        av_free(pbuf);
1288
    }
1289

    
1290
    fileno_index++;
1291
}
1292
#endif
1293

    
1294
static int dvbsub_display_end_segment(AVCodecContext *avctx, uint8_t *buf,
1295
                                        int buf_size, AVSubtitle *sub)
1296
{
1297
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1298

    
1299
    DVBSubRegion *region;
1300
    DVBSubRegionDisplay *display;
1301
    AVSubtitleRect *rect;
1302
    DVBSubCLUT *clut;
1303
    uint32_t *clut_table;
1304
    int i;
1305

    
1306
    sub->rects = NULL;
1307
    sub->start_display_time = 0;
1308
    sub->end_display_time = ctx->time_out * 1000;
1309
    sub->format = 0;
1310

    
1311
    sub->num_rects = ctx->display_list_size;
1312

    
1313
    if (sub->num_rects > 0)
1314
        sub->rects = av_mallocz(sizeof(AVSubtitleRect) * sub->num_rects);
1315

    
1316
    i = 0;
1317

    
1318
    for (display = ctx->display_list; display != NULL; display = display->next) {
1319
        region = get_region(ctx, display->region_id);
1320
        rect = &sub->rects[i];
1321

    
1322
        if (region == NULL)
1323
            continue;
1324

    
1325
        rect->x = display->x_pos;
1326
        rect->y = display->y_pos;
1327
        rect->w = region->width;
1328
        rect->h = region->height;
1329
        rect->nb_colors = 16;
1330
        rect->linesize = region->width;
1331

    
1332
        clut = get_clut(ctx, region->clut);
1333

    
1334
        if (clut == NULL)
1335
            clut = &default_clut;
1336

    
1337
        switch (region->depth) {
1338
        case 2:
1339
            clut_table = clut->clut4;
1340
            break;
1341
        case 8:
1342
            clut_table = clut->clut256;
1343
            break;
1344
        case 4:
1345
        default:
1346
            clut_table = clut->clut16;
1347
            break;
1348
        }
1349

    
1350
        rect->rgba_palette = av_malloc((1 << region->depth) * sizeof(uint32_t));
1351
        memcpy(rect->rgba_palette, clut_table, (1 << region->depth) * sizeof(uint32_t));
1352

    
1353
        rect->bitmap = av_malloc(region->buf_size);
1354
        memcpy(rect->bitmap, region->pbuf, region->buf_size);
1355

    
1356
        i++;
1357
    }
1358

    
1359
    sub->num_rects = i;
1360

    
1361
#ifdef DEBUG_SAVE_IMAGES
1362
    save_display_set(ctx);
1363
#endif
1364

    
1365
    return 1;
1366
}
1367

    
1368
static int dvbsub_decode(AVCodecContext *avctx,
1369
                         void *data, int *data_size,
1370
                         uint8_t *buf, int buf_size)
1371
{
1372
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1373
    AVSubtitle *sub = (AVSubtitle*) data;
1374
    uint8_t *p, *p_end;
1375
    int segment_type;
1376
    int page_id;
1377
    int segment_length;
1378

    
1379
#ifdef DEBUG_PACKET_CONTENTS
1380
    int i;
1381

    
1382
    av_log(avctx, AV_LOG_INFO, "DVB sub packet:\n");
1383

    
1384
    for (i=0; i < buf_size; i++)
1385
    {
1386
        av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
1387
        if (i % 16 == 15)
1388
            av_log(avctx, AV_LOG_INFO, "\n");
1389
    }
1390

    
1391
    if (i % 16 != 0)
1392
        av_log(avctx, AV_LOG_INFO, "\n");
1393

    
1394
#endif
1395

    
1396
    if (buf_size <= 2)
1397
        return -1;
1398

    
1399
    p = buf;
1400
    p_end = buf + buf_size;
1401

    
1402
    while (p < p_end && *p == 0x0f)
1403
    {
1404
        p += 1;
1405
        segment_type = *p++;
1406
        page_id = BE_16(p);
1407
        p += 2;
1408
        segment_length = BE_16(p);
1409
        p += 2;
1410

    
1411
        if (page_id == ctx->composition_id || page_id == ctx->ancillary_id) {
1412
            switch (segment_type) {
1413
            case DVBSUB_PAGE_SEGMENT:
1414
                dvbsub_parse_page_segment(avctx, p, segment_length);
1415
                break;
1416
            case DVBSUB_REGION_SEGMENT:
1417
                dvbsub_parse_region_segment(avctx, p, segment_length);
1418
                break;
1419
            case DVBSUB_CLUT_SEGMENT:
1420
                dvbsub_parse_clut_segment(avctx, p, segment_length);
1421
                break;
1422
            case DVBSUB_OBJECT_SEGMENT:
1423
                dvbsub_parse_object_segment(avctx, p, segment_length);
1424
                break;
1425
            case DVBSUB_DISPLAY_SEGMENT:
1426
                *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1427
                break;
1428
            default:
1429
#ifdef DEBUG
1430
                av_log(avctx, AV_LOG_INFO, "Subtitling segment type 0x%x, page id %d, length %d\n",
1431
                        segment_type, page_id, segment_length);
1432
#endif
1433
                break;
1434
            }
1435
        }
1436

    
1437
        p += segment_length;
1438
    }
1439

    
1440
    if (p != p_end)
1441
    {
1442
#ifdef DEBUG
1443
        av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
1444
#endif
1445
        return -1;
1446
    }
1447

    
1448
    return buf_size;
1449
}
1450

    
1451

    
1452
AVCodec dvbsub_decoder = {
1453
    "dvbsub",
1454
    CODEC_TYPE_SUBTITLE,
1455
    CODEC_ID_DVB_SUBTITLE,
1456
    sizeof(DVBSubContext),
1457
    dvbsub_init_decoder,
1458
    NULL,
1459
    dvbsub_close_decoder,
1460
    dvbsub_decode,
1461
};
1462

    
1463
/* Parser (mostly) copied from dvdsub.c */
1464

    
1465
#define PARSE_BUF_SIZE  (65536)
1466

    
1467

    
1468
/* parser definition */
1469
typedef struct DVBSubParseContext {
1470
    uint8_t *packet_buf;
1471
    int packet_start;
1472
    int packet_index;
1473
    int in_packet;
1474
} DVBSubParseContext;
1475

    
1476
static int dvbsub_parse_init(AVCodecParserContext *s)
1477
{
1478
    DVBSubParseContext *pc = s->priv_data;
1479
    pc->packet_buf = av_malloc(PARSE_BUF_SIZE);
1480

    
1481
    return 0;
1482
}
1483

    
1484
static int dvbsub_parse(AVCodecParserContext *s,
1485
                        AVCodecContext *avctx,
1486
                        uint8_t **poutbuf, int *poutbuf_size,
1487
                        const uint8_t *buf, int buf_size)
1488
{
1489
    DVBSubParseContext *pc = s->priv_data;
1490
    uint8_t *p, *p_end;
1491
    int len, buf_pos = 0;
1492

    
1493
#ifdef DEBUG
1494
    av_log(avctx, AV_LOG_INFO, "DVB parse packet pts=%Lx, lpts=%Lx, cpts=%Lx:\n",
1495
            s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
1496
#endif
1497

    
1498
#ifdef DEBUG_PACKET_CONTENTS
1499
    int i;
1500

    
1501
    for (i=0; i < buf_size; i++)
1502
    {
1503
        av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
1504
        if (i % 16 == 15)
1505
            av_log(avctx, AV_LOG_INFO, "\n");
1506
    }
1507

    
1508
    if (i % 16 != 0)
1509
        av_log(avctx, AV_LOG_INFO, "\n");
1510

    
1511
#endif
1512

    
1513
    *poutbuf = NULL;
1514
    *poutbuf_size = 0;
1515

    
1516
    s->fetch_timestamp = 1;
1517

    
1518
    if (s->last_pts != s->pts && s->last_pts != AV_NOPTS_VALUE) /* Start of a new packet */
1519
    {
1520
        if (pc->packet_index != pc->packet_start)
1521
        {
1522
#ifdef DEBUG
1523
            av_log(avctx, AV_LOG_INFO, "Discarding %d bytes\n",
1524
                pc->packet_index - pc->packet_start);
1525
#endif
1526
        }
1527

    
1528
        pc->packet_start = 0;
1529
        pc->packet_index = 0;
1530

    
1531
        if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {
1532
#ifdef DEBUG
1533
            av_log(avctx, AV_LOG_INFO, "Bad packet header\n");
1534
#endif
1535
            return -1;
1536
        }
1537

    
1538
        buf_pos = 2;
1539

    
1540
        pc->in_packet = 1;
1541
    } else {
1542
        if (pc->packet_start != 0)
1543
        {
1544
            if (pc->packet_index != pc->packet_start)
1545
            {
1546
                memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,
1547
                            pc->packet_index - pc->packet_start);
1548

    
1549
                pc->packet_index -= pc->packet_start;
1550
                pc->packet_start = 0;
1551
            } else {
1552
                pc->packet_start = 0;
1553
                pc->packet_index = 0;
1554
            }
1555
        }
1556
    }
1557

    
1558
    if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)
1559
        return -1;
1560

    
1561
/* if not currently in a packet, discard data */
1562
    if (pc->in_packet == 0)
1563
        return buf_size;
1564

    
1565
    memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos);
1566
    pc->packet_index += buf_size - buf_pos;
1567

    
1568
    p = pc->packet_buf;
1569
    p_end = pc->packet_buf + pc->packet_index;
1570

    
1571
    while (p < p_end)
1572
    {
1573
        if (*p == 0x0f)
1574
        {
1575
            if (p + 6 <= p_end)
1576
            {
1577
                len = BE_16(p + 4);
1578

    
1579
                if (p + len + 6 <= p_end)
1580
                {
1581
                    *poutbuf_size += len + 6;
1582

    
1583
                    p += len + 6;
1584
                } else
1585
                    break;
1586
            } else
1587
                break;
1588
        } else if (*p == 0xff) {
1589
            if (p + 1 < p_end)
1590
            {
1591
#ifdef DEBUG
1592
                av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
1593
#endif
1594
            }
1595
            pc->packet_index = p - pc->packet_buf;
1596
            pc->in_packet = 0;
1597
            break;
1598
        } else {
1599
            av_log(avctx, AV_LOG_ERROR, "Junk in packet\n");
1600

    
1601
            pc->packet_index = p - pc->packet_buf;
1602
            pc->in_packet = 0;
1603
            break;
1604
        }
1605
    }
1606

    
1607
    if (*poutbuf_size > 0)
1608
    {
1609
        *poutbuf = pc->packet_buf;
1610
        pc->packet_start = *poutbuf_size;
1611
    }
1612

    
1613
    if (s->last_pts == AV_NOPTS_VALUE)
1614
        s->last_pts = s->pts;
1615

    
1616
    return buf_size;
1617
}
1618

    
1619
static void dvbsub_parse_close(AVCodecParserContext *s)
1620
{
1621
    DVBSubParseContext *pc = s->priv_data;
1622
    av_freep(&pc->packet_buf);
1623
}
1624

    
1625
AVCodecParser dvbsub_parser = {
1626
    { CODEC_ID_DVB_SUBTITLE },
1627
    sizeof(DVBSubParseContext),
1628
    dvbsub_parse_init,
1629
    dvbsub_parse,
1630
    dvbsub_parse_close,
1631
};