summaryrefslogtreecommitdiff
path: root/dvbspu.c
blob: 951e2f8c78826af0ae2d2cc7e9f3ef271e7d46db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
/*
 * SPU decoder for DVB devices
 *
 * Copyright (C) 2001.2002 Andreas Schultz <aschultz@warp10.net>
 *
 * This code is distributed under the terms and conditions of the
 * GNU GENERAL PUBLIC LICENSE. See the file COPYING for details.
 *
 * parts of this file are derived from the OMS program.
 *
 * $Id: dvbspu.c 2.8 2010/01/17 13:43:27 kls Exp $
 */

#include "dvbspu.h"
#include <assert.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>

/*
 * cDvbSpubitmap:
 *
 * this is a bitmap of the full screen and two palettes
 * the normal palette for the background and the highlight palette
 *
 * Inputs:
 *  - a SPU rle encoded image on creation, which will be decoded into
 *    the full screen indexed bitmap
 *
 * Output:
 *  - a minimal sized cDvbSpuBitmap a given palette, the indexed bitmap
 *    will be scanned to get the smallest possible resulting bitmap considering
 *    transparencies
 */

// #define SPUDEBUG

#ifdef SPUDEBUG
#define DEBUG(format, args...) printf (format, ## args)
#else
#define DEBUG(format, args...)
#endif

// --- cDvbSpuPalette---------------------------------------------------------

void cDvbSpuPalette::setPalette(const uint32_t * pal)
{
    for (int i = 0; i < 16; i++)
        palette[i] = yuv2rgb(pal[i]);
}

// --- cDvbSpuBitmap ---------------------------------------------------------

#define setMin(a, b) if (a > b) a = b
#define setMax(a, b) if (a < b) a = b

#define spuXres   720
#define spuYres   576

#define revRect(r1, r2) { r1.x1 = r2.x2; r1.y1 = r2.y2; r1.x2 = r2.x1; r1.y2 = r2.y1; }

cDvbSpuBitmap::cDvbSpuBitmap(sDvbSpuRect size,
                             uint8_t * fodd, uint8_t * eodd,
                             uint8_t * feven, uint8_t * eeven)
{
    size.x1 = max(size.x1, 0);
    size.y1 = max(size.y1, 0);
    size.x2 = min(size.x2, spuXres - 1);
    size.y2 = min(size.y2, spuYres - 1);

    bmpsize = size;
    revRect(minsize[0], size);
    revRect(minsize[1], size);
    revRect(minsize[2], size);
    revRect(minsize[3], size);

    int MemSize = spuXres * spuYres * sizeof(uint8_t);
    bmp = new uint8_t[MemSize];

    if (bmp)
       memset(bmp, 0, MemSize);
    putFieldData(0, fodd, eodd);
    putFieldData(1, feven, eeven);
}

cDvbSpuBitmap::~cDvbSpuBitmap()
{
    delete[]bmp;
}

cBitmap *cDvbSpuBitmap::getBitmap(const aDvbSpuPalDescr paldescr,
                                  const cDvbSpuPalette & pal,
                                  sDvbSpuRect & size) const
{
    int h = size.height();
    int w = size.width();

    if (size.y1 + h >= spuYres)
        h = spuYres - size.y1 - 1;
    if (size.x1 + w >= spuXres)
        w = spuXres - size.x1 - 1;

    if (w & 0x03)
        w += 4 - (w & 0x03);

    cBitmap *ret = new cBitmap(w, h, 2);

    // set the palette
    for (int i = 0; i < 4; i++) {
        uint32_t color =
            pal.getColor(paldescr[i].index, paldescr[i].trans);
        ret->SetColor(i, (tColor) color);
    }

    // set the content
    if (bmp) {
       for (int yp = 0; yp < h; yp++) {
           for (int xp = 0; xp < w; xp++) {
               uint8_t idx = bmp[(size.y1 + yp) * spuXres + size.x1 + xp];
               ret->SetIndex(xp, yp, idx);
           }
       }
    }
    return ret;
}

// find the minimum non-transparent area
bool cDvbSpuBitmap::getMinSize(const aDvbSpuPalDescr paldescr,
                               sDvbSpuRect & size) const
{
    bool ret = false;
    for (int i = 0; i < 4; i++) {
        if (paldescr[i].trans != 0) {
            if (!ret)
                size = minsize[i];
            else {
                setMin(size.x1, minsize[i].x1);
                setMin(size.y1, minsize[i].y1);
                setMax(size.x2, minsize[i].x2);
                setMax(size.y2, minsize[i].y2);
            }
            ret = true;
        }
    }
    if (ret)
        DEBUG("MinSize: (%d, %d) x (%d, %d)\n",
              size.x1, size.y1, size.x2, size.y2);
    if (size.x1 > size.x2 || size.y1 > size.y2)
        return false;

    return ret;
}

void cDvbSpuBitmap::putPixel(int xp, int yp, int len, uint8_t colorid)
{
    if (bmp)
       memset(bmp + spuXres * yp + xp, colorid, len);
    setMin(minsize[colorid].x1, xp);
    setMin(minsize[colorid].y1, yp);
    setMax(minsize[colorid].x2, xp + len - 1);
    setMax(minsize[colorid].y2, yp);
}

static uint8_t getBits(uint8_t * &data, uint8_t & bitf)
{
    uint8_t ret = *data;
    if (bitf)
        ret >>= 4;
    else
        data++;
    bitf ^= 1;

    return (ret & 0xf);
}

void cDvbSpuBitmap::putFieldData(int field, uint8_t * data, uint8_t * endp)
{
    int xp = bmpsize.x1;
    int yp = bmpsize.y1 + field;
    uint8_t bitf = 1;

    while (data < endp) {
        uint16_t vlc = getBits(data, bitf);
        if (vlc < 0x0004) {
            vlc = (vlc << 4) | getBits(data, bitf);
            if (vlc < 0x0010) {
                vlc = (vlc << 4) | getBits(data, bitf);
                if (vlc < 0x0040) {
                    vlc = (vlc << 4) | getBits(data, bitf);
                }
            }
        }

        uint8_t color = vlc & 0x03;
        int len = vlc >> 2;

        // if len == 0 -> end sequence - fill to end of line
        len = len ? len : bmpsize.x2 - xp + 1;
        putPixel(xp, yp, len, color);
        xp += len;

        if (xp > bmpsize.x2) {
            // nextLine
            if (!bitf)
                data++;
            bitf = 1;
            xp = bmpsize.x1;
            yp += 2;
            if (yp > bmpsize.y2)
                return;
        }
    }
}

// --- cDvbSpuDecoder---------------------------------------------------------

#define CMD_SPU_MENU            0x00
#define CMD_SPU_SHOW            0x01
#define CMD_SPU_HIDE            0x02
#define CMD_SPU_SET_PALETTE     0x03
#define CMD_SPU_SET_ALPHA       0x04
#define CMD_SPU_SET_SIZE        0x05
#define CMD_SPU_SET_PXD_OFFSET  0x06
#define CMD_SPU_CHG_COLCON      0x07
#define CMD_SPU_EOF             0xff

#define spuU32(i)  ((spu[i] << 8) + spu[i+1])

cDvbSpuDecoder::cDvbSpuDecoder()
{
    clean = true;
    scaleMode = eSpuNormal;
    spu = NULL;
    osd = NULL;
    spubmp = NULL;
    allowedShow = false;
}

cDvbSpuDecoder::~cDvbSpuDecoder()
{
    delete spubmp;
    delete spu;
    delete osd;
}

void cDvbSpuDecoder::processSPU(uint32_t pts, uint8_t * buf, bool AllowedShow)
{
    setTime(pts);

    DEBUG("SPU pushData: pts: %d\n", pts);

    delete spubmp;
    spubmp = NULL;
    delete[]spu;
    spu = buf;
    spupts = pts;

    DCSQ_offset = cmdOffs();
    prev_DCSQ_offset = 0;

    clean = true;
    allowedShow = AllowedShow;
}

void cDvbSpuDecoder::setScaleMode(cSpuDecoder::eScaleMode ScaleMode)
{
    scaleMode = ScaleMode;
}

void cDvbSpuDecoder::setPalette(uint32_t * pal)
{
    palette.setPalette(pal);
}

void cDvbSpuDecoder::setHighlight(uint16_t sx, uint16_t sy,
                                  uint16_t ex, uint16_t ey,
                                  uint32_t palette)
{
    aDvbSpuPalDescr pld;
    for (int i = 0; i < 4; i++) {
        pld[i].index = 0xf & (palette >> (16 + 4 * i));
        pld[i].trans = 0xf & (palette >> (4 * i));
    }

    bool ne = hlpsize.x1 != sx || hlpsize.y1 != sy ||
        hlpsize.x2 != ex || hlpsize.y2 != ey ||
        pld[0] != hlpDescr[0] || pld[1] != hlpDescr[1] ||
        pld[2] != hlpDescr[2] || pld[3] != hlpDescr[3];

    if (ne) {
        DEBUG("setHighlight: %d,%d x %d,%d\n", sx, sy, ex, ey);
        hlpsize.x1 = sx;
        hlpsize.y1 = sy;
        hlpsize.x2 = ex;
        hlpsize.y2 = ey;
        memcpy(hlpDescr, pld, sizeof(aDvbSpuPalDescr));
        highlight = true;
        clean = false;
    }
}

void cDvbSpuDecoder::clearHighlight(void)
{
    clean &= !highlight;
    highlight = false;
    hlpsize.x1 = -1;
    hlpsize.y1 = -1;
    hlpsize.x2 = -1;
    hlpsize.y2 = -1;
}

sDvbSpuRect cDvbSpuDecoder::CalcAreaSize(sDvbSpuRect fgsize, cBitmap *fgbmp, sDvbSpuRect bgsize, cBitmap *bgbmp)
{
    sDvbSpuRect size;
    if (fgbmp && bgbmp) {
       size.x1 = min(fgsize.x1, bgsize.x1);
       size.y1 = min(fgsize.y1, bgsize.y1);
       size.x2 = max(fgsize.x2, bgsize.x2);
       size.y2 = max(fgsize.y2, bgsize.y2);
       }
    else if (fgbmp) {
       size.x1 = fgsize.x1;
       size.y1 = fgsize.y1;
       size.x2 = fgsize.x2;
       size.y2 = fgsize.y2;
       }
    else if (bgbmp) {
       size.x1 = bgsize.x1;
       size.y1 = bgsize.y1;
       size.x2 = bgsize.x2;
       size.y2 = bgsize.y2;
       }
    else {
       size.x1 = 0;
       size.y1 = 0;
       size.x2 = 0;
       size.y2 = 0;
       }
    return size;
}

int cDvbSpuBitmap::getMinBpp(const aDvbSpuPalDescr paldescr)
{
    int col = 1;
    for (int i = 0; i < 4; i++) {
        if (paldescr[i].trans != 0) {
                col++;
        }
    }
    return col > 2 ? 2 : 1;
}

int cDvbSpuDecoder::CalcAreaBpp(cBitmap *fgbmp, cBitmap *bgbmp)
{
        int fgbpp = 0;
        int bgbpp = 0;
        int ret;
    if (fgbmp) {
            fgbpp = spubmp->getMinBpp(hlpDescr);
    }
    if (bgbmp) {
            bgbpp = spubmp->getMinBpp(palDescr);
    }
    ret = fgbpp + bgbpp;
    if (ret > 2)
            ret = 4;
    return ret;
}


void cDvbSpuDecoder::Draw(void)
{
    cMutexLock MutexLock(&mutex);
    if (!spubmp) {
        Hide();
        return;
    }
    sDvbSpuRect bgsize;
    cBitmap *fg = NULL;
    cBitmap *bg = NULL;

    if (highlight)
        fg = spubmp->getBitmap(hlpDescr, palette, hlpsize);

    if (spubmp->getMinSize(palDescr, bgsize))
        bg = spubmp->getBitmap(palDescr, palette, bgsize);

    if (!fg || !bg || !osd)
        Hide();

    if (osd == NULL) {
            restricted_osd = false;
            osd = cOsdProvider::NewOsd(0, 0);

            tArea Area = { size.x1, size.y1, size.x2, size.y2, 4};
            if (osd->CanHandleAreas(&Area, 1) != oeOk)
                    restricted_osd = true;
            else
                osd->SetAreas(&Area, 1);
    }
    if (restricted_osd) {
            sDvbSpuRect hlsize;
            bool setarea = false;
            /* reduce fg area (only valid if there is no bg below) */
            if (fg) {
                    spubmp->getMinSize(hlpDescr,hlsize);
                    /* clip to the highligh area */
                    setMax(hlsize.x1, hlpsize.x1);
                    setMax(hlsize.y1, hlpsize.y1);
                    setMin(hlsize.x2, hlpsize.x2);
                    setMin(hlsize.y2, hlpsize.y2);
                    if (hlsize.x1 > hlsize.x2 || hlsize.y1 > hlsize.y2) {
                            hlsize.x1 = hlsize.x2 = hlsize.y1 = hlsize.y2 = 0;
                    }
            }
            sDvbSpuRect areaSize = CalcAreaSize((fg && bg) ? hlpsize : hlsize, fg, bgsize, bg);

#define DIV(a, b) (a/b)?:1
            for (int d = 1; !setarea && d <= 2; d++) {

                    /* first try old behaviour */
                    tArea Area = { areaSize.x1, areaSize.y1, areaSize.x2, areaSize.y2, DIV(CalcAreaBpp(fg, bg), d) };

                    if ((Area.Width() & 7) != 0)
                            Area.x2 += 8 - (Area.Width() & 7);

                    if (osd->CanHandleAreas(&Area, 1) == oeOk &&
                        osd->SetAreas(&Area, 1) == oeOk)
                            setarea = true;

                    /* second try to split area if there is both area */
                    if (!setarea && fg && bg) {
                            tArea Area_Both [2] = {
                                    {bgsize.x1, bgsize.y1, bgsize.x2, bgsize.y2, DIV(CalcAreaBpp(0, bg), d)},
                                    {hlpsize.x1, hlpsize.y1, hlpsize.x2, hlpsize.y2, DIV(CalcAreaBpp(fg, 0), d)}
                            };
                            if (!Area_Both[0].Intersects(Area_Both[1])) {
                                    /* there is no intersection. We can reduce hl */
                                    Area_Both[1].x1 = hlsize.x1;
                                    Area_Both[1].y1 = hlsize.y1;
                                    Area_Both[1].x2 = hlsize.x2;
                                    Area_Both[1].y2 = hlsize.y2;

                                    if ((Area_Both[0].Width() & 7) != 0)
                                            Area_Both[0].x2 += 8 - (Area_Both[0].Width() & 7);
                                    if ((Area_Both[1].Width() & 7) != 0)
                                            Area_Both[1].x2 += 8 - (Area_Both[1].Width() & 7);
                                    if (osd->CanHandleAreas(Area_Both, 2) == oeOk &&
                                        osd->SetAreas(Area_Both, 2) == oeOk)
                                            setarea = true;
                            }
                    }
            }
            if (!setarea)
              dsyslog("dvbspu: AreaSize (%d, %d) (%d, %d) Bpp %d", areaSize.x1, areaSize.y1, areaSize.x2, areaSize.y2, (fg && bg) ? 4 : 2 );
    }

    /* we could draw use DrawPixel on osd */
    if (bg || fg) {
        if (bg)
           osd->DrawBitmap(bgsize.x1, bgsize.y1, *bg);
        if (fg)
           osd->DrawBitmap(hlpsize.x1, hlpsize.y1, *fg);
        delete fg;
        delete bg;

        osd->Flush();
    }

    clean = true;
}

void cDvbSpuDecoder::Hide(void)
{
    cMutexLock MutexLock(&mutex);
    delete osd;
    osd = NULL;
}

void cDvbSpuDecoder::Empty(void)
{
    Hide();

    delete spubmp;
    spubmp = NULL;

    delete[]spu;
    spu = NULL;

    clearHighlight();
    clean = true;
}

int cDvbSpuDecoder::setTime(uint32_t pts)
{
    if (!spu)
        return 0;

    if (spu && !clean)
        Draw();

    while (DCSQ_offset != prev_DCSQ_offset) {   /* Display Control Sequences */
        int i = DCSQ_offset;
        state = spNONE;

        uint32_t exec_time = spupts + spuU32(i) * 1024;
        if ((pts != 0) && (exec_time > pts))
            return 0;
        DEBUG("offs = %d, rel = %d, time = %d, pts = %d, diff = %d\n",
              i, spuU32(i) * 1024, exec_time, pts, exec_time - pts);

        if (pts != 0) {
            uint16_t feven = 0;
            uint16_t fodd = 0;

            i += 2;

            prev_DCSQ_offset = DCSQ_offset;
            DCSQ_offset = spuU32(i);
            DEBUG("offs = %d, DCSQ = %d, prev_DCSQ = %d\n",
                           i, DCSQ_offset, prev_DCSQ_offset);
            i += 2;

            while (spu[i] != CMD_SPU_EOF) {     // Command Sequence
                switch (spu[i]) {
                case CMD_SPU_SHOW:     // show subpicture
                    DEBUG("\tshow subpicture\n");
                    state = spSHOW;
                    i++;
                    break;

                case CMD_SPU_HIDE:     // hide subpicture
                    DEBUG("\thide subpicture\n");
                    state = spHIDE;
                    i++;
                    break;

                case CMD_SPU_SET_PALETTE:      // CLUT
                    palDescr[0].index = spu[i + 2] & 0xf;
                    palDescr[1].index = spu[i + 2] >> 4;
                    palDescr[2].index = spu[i + 1] & 0xf;
                    palDescr[3].index = spu[i + 1] >> 4;
                    i += 3;
                    break;

                case CMD_SPU_SET_ALPHA:        // transparency palette
                    palDescr[0].trans = spu[i + 2] & 0xf;
                    palDescr[1].trans = spu[i + 2] >> 4;
                    palDescr[2].trans = spu[i + 1] & 0xf;
                    palDescr[3].trans = spu[i + 1] >> 4;
                    i += 3;
                    break;

                case CMD_SPU_SET_SIZE: // image coordinates
                    size.x1 = (spu[i + 1] << 4) | (spu[i + 2] >> 4);
                    size.x2 = ((spu[i + 2] & 0x0f) << 8) | spu[i + 3];

                    size.y1 = (spu[i + 4] << 4) | (spu[i + 5] >> 4);
                    size.y2 = ((spu[i + 5] & 0x0f) << 8) | spu[i + 6];

                    DEBUG("\t(%d, %d) x (%d, %d)\n",
                          size.x1, size.y1, size.x2, size.y2);
                    i += 7;
                    break;

                case CMD_SPU_SET_PXD_OFFSET:   // image 1 / image 2 offsets
                    fodd = spuU32(i + 1);
                    feven = spuU32(i + 3);
                    DEBUG("\todd = %d even = %d\n", fodd, feven);
                    i += 5;
                    break;

                case CMD_SPU_CHG_COLCON: {
                    int size = spuU32(i + 1);
                    i += 1 + size;
                    }
                    break;

                case CMD_SPU_MENU:
                    DEBUG("\tspu menu\n");
                    state = spMENU;

                    i++;
                    break;

                default:
                    esyslog("invalid sequence in control header (%.2x)",
                            spu[i]);
                    Empty();
                    return 0;
                }
            }
            if (fodd != 0 && feven != 0) {
                Hide();
                delete spubmp;
                spubmp = new cDvbSpuBitmap(size, spu + fodd, spu + feven,
                                           spu + feven, spu + cmdOffs());
            }
        } else if (!clean)
            state = spSHOW;

        if ((state == spSHOW && allowedShow) || state == spMENU)
            Draw();

        if (state == spHIDE)
            Hide();

        if (pts == 0)
            return 0;
    }

    return 1;
}