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
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
|
/* Valid values for ANTIALIASING_ALGORITHM:
0: none (fastest, most ugly)
1: aproximate
2: full (slowest, best looking)
*/
#define ANTIALIASING_ALGORITHM 1
/* SPUdec.c
Skeleton of function spudec_process_controll() is from xine sources.
Further works:
LGB,... (yeah, try to improve it and insert your name here! ;-)
Kim Minh Kaplan
implement fragments reassembly, RLE decoding.
read brightness from the IFO.
For information on SPU format see <URL:http://sam.zoy.org/doc/dvd/subtitles/>
and <URL:http://members.aol.com/mpucoder/DVD/spu.html>
*/
#include "config.h"
#include "mp_msg.h"
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#if ANTIALIASING_ALGORITHM == 2
#include <math.h>
#endif
#include "spudec.h"
#define MIN(a, b) ((a)<(b)?(a):(b))
typedef struct {
unsigned int global_palette[16];
unsigned int orig_frame_width, orig_frame_height;
unsigned char* packet;
size_t packet_reserve; /* size of the memory pointed to by packet */
unsigned int packet_offset; /* end of the currently assembled fragment */
unsigned int packet_size; /* size of the packet once all fragments are assembled */
unsigned int control_start; /* index of start of control data */
unsigned int palette[4];
unsigned int alpha[4];
unsigned int cuspal[4];
unsigned int custom;
unsigned int now_pts;
unsigned int start_pts, end_pts;
unsigned int start_col, end_col;
unsigned int start_row, end_row;
unsigned int width, height, stride;
unsigned int current_nibble[2]; /* next data nibble (4 bits) to be
processed (for RLE decoding) for
even and odd lines */
int deinterlace_oddness; /* 0 or 1, index into current_nibble */
size_t image_size; /* Size of the image buffer */
unsigned char *image; /* Grayscale value */
unsigned char *aimage; /* Alpha value */
unsigned int scaled_frame_width, scaled_frame_height;
unsigned int scaled_start_col, scaled_start_row;
unsigned int scaled_width, scaled_height, scaled_stride;
size_t scaled_image_size;
unsigned char *scaled_image;
unsigned char *scaled_aimage;
} spudec_handle_t;
static inline unsigned int get_be16(const unsigned char *p)
{
return (p[0] << 8) + p[1];
}
static inline unsigned int get_be24(const unsigned char *p)
{
return (get_be16(p) << 8) + p[2];
}
static void next_line(spudec_handle_t *this)
{
if (this->current_nibble[this->deinterlace_oddness] % 2)
this->current_nibble[this->deinterlace_oddness]++;
this->deinterlace_oddness = (this->deinterlace_oddness + 1) % 2;
}
static inline unsigned char get_nibble(spudec_handle_t *this)
{
unsigned char nib;
unsigned int *nibblep = this->current_nibble + this->deinterlace_oddness;
if (*nibblep / 2 >= this->control_start) {
mp_msg(MSGT_SPUDEC,MSGL_WARN, "SPUdec: ERROR: get_nibble past end of packet\n");
return 0;
}
nib = this->packet[*nibblep / 2];
if (*nibblep % 2)
nib &= 0xf;
else
nib >>= 4;
++*nibblep;
return nib;
}
static inline int mkalpha(int i)
{
/* In mplayer's alpha planes, 0 is transparent, then 1 is nearly
opaque upto 255 which is transparent */
switch (i) {
case 0xf:
return 1;
case 0:
return 0;
default:
return (0xf - i) << 4;
}
}
static void spudec_process_data(spudec_handle_t *this)
{
unsigned int cmap[4], alpha[4];
unsigned int i, x, y;
this->scaled_frame_width = 0;
this->scaled_frame_height = 0;
for (i = 0; i < 4; ++i) {
alpha[i] = mkalpha(this->alpha[i]);
if (alpha[i] == 0)
cmap[i] = 0;
else if (this->custom){
cmap[i] = ((this->cuspal[i] >> 16) & 0xff);
if (cmap[i] + alpha[i] > 255)
cmap[i] = 256 - alpha[i];
}
else {
cmap[i] = ((this->global_palette[this->palette[i]] >> 16) & 0xff);
if (cmap[i] + alpha[i] > 255)
cmap[i] = 256 - alpha[i];
}
}
if (this->image_size < this->stride * this->height) {
if (this->image != NULL) {
free(this->image);
this->image_size = 0;
}
this->image = malloc(2 * this->stride * this->height);
if (this->image) {
this->image_size = this->stride * this->height;
this->aimage = this->image + this->image_size;
}
}
if (this->image == NULL)
return;
/* Kludge: draw_alpha needs width multiple of 8. */
if (this->width < this->stride)
for (y = 0; y < this->height; ++y)
memset(this->aimage + y * this->stride + this->width, 0, this->stride - this->width);
i = this->current_nibble[1];
x = 0;
y = 0;
while (this->current_nibble[0] < i
&& this->current_nibble[1] / 2 < this->control_start
&& y < this->height) {
unsigned int len, color;
unsigned int rle = 0;
rle = get_nibble(this);
if (rle < 0x04) {
rle = (rle << 4) | get_nibble(this);
if (rle < 0x10) {
rle = (rle << 4) | get_nibble(this);
if (rle < 0x040) {
rle = (rle << 4) | get_nibble(this);
if (rle < 0x0004)
rle |= ((this->width - x) << 2);
}
}
}
color = 3 - (rle & 0x3);
len = rle >> 2;
if (len > this->width - x || len == 0)
len = this->width - x;
/* FIXME have to use palette and alpha map*/
memset(this->image + y * this->stride + x, cmap[color], len);
memset(this->aimage + y * this->stride + x, alpha[color], len);
x += len;
if (x >= this->width) {
next_line(this);
x = 0;
++y;
}
}
}
static void spudec_process_control(spudec_handle_t *this, unsigned int pts100)
{
int a,b; /* Temporary vars */
unsigned int date, type;
unsigned int off;
unsigned int start_off = 0;
unsigned int next_off;
this->control_start = get_be16(this->packet + 2);
next_off = this->control_start;
while (start_off != next_off) {
start_off = next_off;
date = get_be16(this->packet + start_off) * 1024;
next_off = get_be16(this->packet + start_off + 2);
mp_msg(MSGT_SPUDEC,MSGL_DBG2, "date=%d\n", date);
off = start_off + 4;
for (type = this->packet[off++]; type != 0xff; type = this->packet[off++]) {
mp_msg(MSGT_SPUDEC,MSGL_DBG2, "cmd=%d ",type);
switch(type) {
case 0x00:
/* Menu ID, 1 byte */
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Menu ID\n");
/* shouldn't a Menu ID type force display start? */
//this->start_pts = pts100 + date;
//this->end_pts = UINT_MAX;
break;
case 0x01:
/* Start display */
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Start display!\n");
this->start_pts = pts100 + date;
this->end_pts = UINT_MAX;
break;
case 0x02:
/* Stop display */
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Stop display!\n");
this->end_pts = pts100 + date;
break;
case 0x03:
/* Palette */
this->palette[0] = this->packet[off] >> 4;
this->palette[1] = this->packet[off] & 0xf;
this->palette[2] = this->packet[off + 1] >> 4;
this->palette[3] = this->packet[off + 1] & 0xf;
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Palette %d, %d, %d, %d\n",
this->palette[0], this->palette[1], this->palette[2], this->palette[3]);
off+=2;
break;
case 0x04:
/* Alpha */
this->alpha[0] = this->packet[off] >> 4;
this->alpha[1] = this->packet[off] & 0xf;
this->alpha[2] = this->packet[off + 1] >> 4;
this->alpha[3] = this->packet[off + 1] & 0xf;
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Alpha %d, %d, %d, %d\n",
this->alpha[0], this->alpha[1], this->alpha[2], this->alpha[3]);
off+=2;
break;
case 0x05:
/* Co-ords */
a = get_be24(this->packet + off);
b = get_be24(this->packet + off + 3);
this->start_col = a >> 12;
this->end_col = a & 0xfff;
this->width = (this->end_col < this->start_col) ? 0 : this->end_col - this->start_col + 1;
this->stride = (this->width + 7) & ~7; /* Kludge: draw_alpha needs width multiple of 8 */
this->start_row = b >> 12;
this->end_row = b & 0xfff;
this->height = (this->end_row < this->start_row) ? 0 : this->end_row - this->start_row /* + 1 */;
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Coords col: %d - %d row: %d - %d (%dx%d)\n",
this->start_col, this->end_col, this->start_row, this->end_row,
this->width, this->height);
off+=6;
break;
case 0x06:
/* Graphic lines */
this->current_nibble[0] = 2 * get_be16(this->packet + off);
this->current_nibble[1] = 2 * get_be16(this->packet + off + 2);
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Graphic offset 1: %d offset 2: %d\n",
this->current_nibble[0] / 2, this->current_nibble[1] / 2);
off+=4;
break;
case 0xff:
/* All done, bye-bye */
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"Done!\n");
return;
// break;
default:
mp_msg(MSGT_SPUDEC,MSGL_WARN,"spudec: Error determining control type 0x%02x. Skipping %d bytes.\n",
type, next_off - off);
goto next_control;
}
}
next_control:
;
}
}
static void spudec_decode(spudec_handle_t *this, unsigned int pts100)
{
spudec_process_control(this, pts100);
spudec_process_data(this);
}
void spudec_assemble(void *this, unsigned char *packet, unsigned int len, unsigned int pts100)
{
spudec_handle_t *spu = (spudec_handle_t*)this;
// spudec_heartbeat(this, pts100);
if (len < 2) {
mp_msg(MSGT_SPUDEC,MSGL_WARN,"SPUasm: packet too short\n");
return;
}
if (spu->packet_offset == 0) {
unsigned int len2 = get_be16(packet);
// Start new fragment
if (spu->packet_reserve < len2) {
if (spu->packet != NULL)
free(spu->packet);
spu->packet = malloc(len2);
spu->packet_reserve = spu->packet != NULL ? len2 : 0;
}
if (spu->packet != NULL) {
spu->deinterlace_oddness = 0;
spu->packet_size = len2;
if (len > len2) {
mp_msg(MSGT_SPUDEC,MSGL_WARN,"SPUasm: invalid frag len / len2: %d / %d \n", len, len2);
return;
}
memcpy(spu->packet, packet, len);
spu->packet_offset = len;
}
} else {
// Continue current fragment
if (spu->packet_size < spu->packet_offset + len){
mp_msg(MSGT_SPUDEC,MSGL_WARN,"SPUasm: invalid fragment\n");
spu->packet_size = spu->packet_offset = 0;
} else {
memcpy(spu->packet + spu->packet_offset, packet, len);
spu->packet_offset += len;
}
}
#if 1
// check if we have a complete packet (unfortunatelly packet_size is bad
// for some disks)
// if (spu->packet_offset == spu->packet_size)
{ unsigned int x=0,y;
while(x+4<=spu->packet_offset){
y=get_be16(spu->packet+x+2); // next control pointer
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"SPUtest: x=%d y=%d off=%d size=%d\n",x,y,spu->packet_offset,spu->packet_size);
if(x>=4 && x==y){ // if it points to self - we're done!
// we got it!
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"SPUgot: off=%d size=%d \n",spu->packet_offset,spu->packet_size);
spudec_decode(spu, pts100);
spu->packet_offset = 0;
break;
}
if(y<=x || y>=spu->packet_size){ // invalid?
mp_msg(MSGT_SPUDEC,MSGL_WARN,"SPUtest: broken packet!!!!! y=%d < x=%d\n",y,x);
spu->packet_size = spu->packet_offset = 0;
break;
}
x=y;
}
}
#else
if (spu->packet_offset == spu->packet_size) {
spudec_decode(spu, pts100);
spu->packet_offset = 0;
}
#endif
}
void spudec_reset(void *this) // called after seek
{
spudec_handle_t *spu = (spudec_handle_t*)this;
spu->now_pts = 0;
spu->packet_size = spu->packet_offset = 0;
}
void spudec_heartbeat(void *this, unsigned int pts100)
{
((spudec_handle_t *)this)->now_pts = pts100;
}
int spudec_visible(void *this){
spudec_handle_t *spu = (spudec_handle_t *)this;
int ret=(spu->start_pts <= spu->now_pts && spu->now_pts < spu->end_pts);
// printf("spu visible: %d \n",ret);
return ret;
}
void spudec_draw(void *this, void (*draw_alpha)(int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride))
{
spudec_handle_t *spu = (spudec_handle_t *)this;
if (spu->start_pts <= spu->now_pts && spu->now_pts < spu->end_pts && spu->image)
draw_alpha(spu->start_col, spu->start_row, spu->width, spu->height,
spu->image, spu->aimage, spu->stride);
}
/* transform mplayer's alpha value into an opacity value that is linear */
static inline int canon_alpha(int alpha)
{
return alpha ? 256 - alpha : 0;
}
void spudec_draw_scaled(void *me, unsigned int dxs, unsigned int dys, void (*draw_alpha)(int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride))
{
spudec_handle_t *spu = (spudec_handle_t *)me;
if (spu->start_pts <= spu->now_pts && spu->now_pts < spu->end_pts) {
if (spu->orig_frame_width == 0 || spu->orig_frame_height == 0
|| (spu->orig_frame_width == dxs && spu->orig_frame_height == dys)) {
if (spu->image)
draw_alpha(spu->start_col, spu->start_row, spu->width, spu->height,
spu->image, spu->aimage, spu->stride);
}
else {
if (spu->scaled_frame_width != dxs || spu->scaled_frame_height != dys) { /* Resizing is needed */
/* scaled_x = scalex * x / 0x100
scaled_y = scaley * y / 0x100
order of operations is important because of rounding. */
unsigned int scalex = 0x100 * dxs / spu->orig_frame_width;
unsigned int scaley = 0x100 * dys / spu->orig_frame_height;
spu->scaled_start_col = spu->start_col * scalex / 0x100;
spu->scaled_start_row = spu->start_row * scaley / 0x100;
spu->scaled_width = spu->width * scalex / 0x100;
spu->scaled_height = spu->height * scaley / 0x100;
/* Kludge: draw_alpha needs width multiple of 8 */
spu->scaled_stride = (spu->scaled_width + 7) & ~7;
if (spu->scaled_image_size < spu->scaled_stride * spu->scaled_height) {
if (spu->scaled_image) {
free(spu->scaled_image);
spu->scaled_image_size = 0;
}
spu->scaled_image = malloc(2 * spu->scaled_stride * spu->scaled_height);
if (spu->scaled_image) {
spu->scaled_image_size = spu->scaled_stride * spu->scaled_height;
spu->scaled_aimage = spu->scaled_image + spu->scaled_image_size;
}
}
if (spu->scaled_image) {
unsigned int x, y;
/* Kludge: draw_alpha needs width multiple of 8. */
if (spu->scaled_width < spu->scaled_stride)
for (y = 0; y < spu->scaled_height; ++y) {
memset(spu->scaled_aimage + y * spu->scaled_stride + spu->scaled_width, 0,
spu->scaled_stride - spu->scaled_width);
/* FIXME: Why is this one needed? */
memset(spu->scaled_image + y * spu->scaled_stride + spu->scaled_width, 0,
spu->scaled_stride - spu->scaled_width);
}
#if ANTIALIASING_ALGORITHM == 0
/* no antialiasing */
for (y = 0; y < spu->scaled_height; ++y) {
int unscaled_y = y * 0x100 / scaley;
int strides = spu->stride * unscaled_y;
int scaled_strides = spu->scaled_stride * y;
for (x = 0; x < spu->scaled_width; ++x) {
int unscaled_x = x * 0x100 / scalex;
spu->scaled_image[scaled_strides + x] = spu->image[strides + unscaled_x];
spu->scaled_aimage[scaled_strides + x] = spu->aimage[strides + unscaled_x];
}
}
#elif ANTIALIASING_ALGORITHM == 1
{
/* Intermediate antialiasing. */
for (y = 0; y < spu->scaled_height; ++y) {
const unsigned int unscaled_top = y * spu->orig_frame_height / dys;
unsigned int unscaled_bottom = (y + 1) * spu->orig_frame_height / dys;
if (unscaled_bottom >= spu->height)
unscaled_bottom = spu->height - 1;
for (x = 0; x < spu->scaled_width; ++x) {
const unsigned int unscaled_left = x * spu->orig_frame_width / dxs;
unsigned int unscaled_right = (x + 1) * spu->orig_frame_width / dxs;
unsigned int color = 0;
unsigned int alpha = 0;
unsigned int walkx, walky;
unsigned int base, tmp;
if (unscaled_right >= spu->width)
unscaled_right = spu->width - 1;
for (walky = unscaled_top; walky <= unscaled_bottom; ++walky)
for (walkx = unscaled_left; walkx <= unscaled_right; ++walkx) {
base = walky * spu->stride + walkx;
tmp = canon_alpha(spu->aimage[base]);
alpha += tmp;
color += tmp * spu->image[base];
}
base = y * spu->scaled_stride + x;
spu->scaled_image[base] = alpha ? color / alpha : 0;
spu->scaled_aimage[base] =
alpha * (1 + unscaled_bottom - unscaled_top) * (1 + unscaled_right - unscaled_left);
/* spu->scaled_aimage[base] =
alpha * dxs * dys / spu->orig_frame_width / spu->orig_frame_height; */
if (spu->scaled_aimage[base]) {
spu->scaled_aimage[base] = 256 - spu->scaled_aimage[base];
if (spu->scaled_aimage[base] + spu->scaled_image[base] > 255)
spu->scaled_image[base] = 256 - spu->scaled_aimage[base];
}
}
}
}
#else
{
/* Best antialiasing. Very slow. */
/* Any pixel (x, y) represents pixels from the original
rectangular region comprised between the columns
unscaled_y and unscaled_y + 0x100 / scaley and the rows
unscaled_x and unscaled_x + 0x100 / scalex
The original rectangular region that the scaled pixel
represents is cut in 9 rectangular areas like this:
+---+-----------------+---+
| 1 | 2 | 3 |
+---+-----------------+---+
| | | |
| 4 | 5 | 6 |
| | | |
+---+-----------------+---+
| 7 | 8 | 9 |
+---+-----------------+---+
The width of the left column is at most one pixel and
it is never null and its right column is at a pixel
boundary. The height of the top row is at most one
pixel it is never null and its bottom row is at a
pixel boundary. The width and height of region 5 are
integral values. The width of the right column is
what remains and is less than one pixel. The height
of the bottom row is what remains and is less than
one pixel.
The row above 1, 2, 3 is unscaled_y. The row between
1, 2, 3 and 4, 5, 6 is top_low_row. The row between 4,
5, 6 and 7, 8, 9 is (unsigned int)unscaled_y_bottom.
The row beneath 7, 8, 9 is unscaled_y_bottom.
The column left of 1, 4, 7 is unscaled_x. The column
between 1, 4, 7 and 2, 5, 8 is left_right_column. The
column between 2, 5, 8 and 3, 6, 9 is (unsigned
int)unscaled_x_right. The column right of 3, 6, 9 is
unscaled_x_right. */
const double inv_scalex = (double) 0x100 / scalex;
const double inv_scaley = (double) 0x100 / scaley;
for (y = 0; y < spu->scaled_height; ++y) {
const double unscaled_y = y * inv_scaley;
const double unscaled_y_bottom = unscaled_y + inv_scaley;
const unsigned int top_low_row = MIN(unscaled_y_bottom, unscaled_y + 1.0);
const double top = top_low_row - unscaled_y;
const unsigned int height = unscaled_y_bottom > top_low_row
? (unsigned int) unscaled_y_bottom - top_low_row
: 0;
const double bottom = unscaled_y_bottom > top_low_row
? unscaled_y_bottom - floor(unscaled_y_bottom)
: 0.0;
for (x = 0; x < spu->scaled_width; ++x) {
const double unscaled_x = x * inv_scalex;
const double unscaled_x_right = unscaled_x + inv_scalex;
const unsigned int left_right_column = MIN(unscaled_x_right, unscaled_x + 1.0);
const double left = left_right_column - unscaled_x;
const unsigned int width = unscaled_x_right > left_right_column
? (unsigned int) unscaled_x_right - left_right_column
: 0;
const double right = unscaled_x_right > left_right_column
? unscaled_x_right - floor(unscaled_x_right)
: 0.0;
double color = 0.0;
double alpha = 0.0;
double tmp;
unsigned int base;
/* Now use these informations to compute a good alpha,
and lightness. The sum is on each of the 9
region's surface and alpha and lightness.
transformed alpha = sum(surface * alpha) / sum(surface)
transformed color = sum(surface * alpha * color) / sum(surface * alpha)
*/
/* 1: top left part */
base = spu->stride * (unsigned int) unscaled_y;
tmp = left * top * canon_alpha(spu->aimage[base + (unsigned int) unscaled_x]);
alpha += tmp;
color += tmp * spu->image[base + (unsigned int) unscaled_x];
/* 2: top center part */
if (width > 0) {
unsigned int walkx;
for (walkx = left_right_column; walkx < (unsigned int) unscaled_x_right; ++walkx) {
base = spu->stride * (unsigned int) unscaled_y + walkx;
tmp = /* 1.0 * */ top * canon_alpha(spu->aimage[base]);
alpha += tmp;
color += tmp * spu->image[base];
}
}
/* 3: top right part */
if (right > 0.0) {
base = spu->stride * (unsigned int) unscaled_y + (unsigned int) unscaled_x_right;
tmp = right * top * canon_alpha(spu->aimage[base]);
alpha += tmp;
color += tmp * spu->image[base];
}
/* 4: center left part */
if (height > 0) {
unsigned int walky;
for (walky = top_low_row; walky < (unsigned int) unscaled_y_bottom; ++walky) {
base = spu->stride * walky + (unsigned int) unscaled_x;
tmp = left /* * 1.0 */ * canon_alpha(spu->aimage[base]);
alpha += tmp;
color += tmp * spu->image[base];
}
}
/* 5: center part */
if (width > 0 && height > 0) {
unsigned int walky;
for (walky = top_low_row; walky < (unsigned int) unscaled_y_bottom; ++walky) {
unsigned int walkx;
base = spu->stride * walky;
for (walkx = left_right_column; walkx < (unsigned int) unscaled_x_right; ++walkx) {
tmp = /* 1.0 * 1.0 * */ canon_alpha(spu->aimage[base + walkx]);
alpha += tmp;
color += tmp * spu->image[base + walkx];
}
}
}
/* 6: center right part */
if (right > 0.0 && height > 0) {
unsigned int walky;
for (walky = top_low_row; walky < (unsigned int) unscaled_y_bottom; ++walky) {
base = spu->stride * walky + (unsigned int) unscaled_x_right;
tmp = right /* * 1.0 */ * canon_alpha(spu->aimage[base]);
alpha += tmp;
color += tmp * spu->image[base];
}
}
/* 7: bottom left part */
if (bottom > 0.0) {
base = spu->stride * (unsigned int) unscaled_y_bottom + (unsigned int) unscaled_x;
tmp = left * bottom * canon_alpha(spu->aimage[base]);
alpha += tmp;
color += tmp * spu->image[base];
}
/* 8: bottom center part */
if (width > 0 && bottom > 0.0) {
unsigned int walkx;
base = spu->stride * (unsigned int) unscaled_y_bottom;
for (walkx = left_right_column; walkx < (unsigned int) unscaled_x_right; ++walkx) {
tmp = /* 1.0 * */ bottom * canon_alpha(spu->aimage[base + walkx]);
alpha += tmp;
color += tmp * spu->image[base + walkx];
}
}
/* 9: bottom right part */
if (right > 0.0 && bottom > 0.0) {
base = spu->stride * (unsigned int) unscaled_y_bottom + (unsigned int) unscaled_x_right;
tmp = right * bottom * canon_alpha(spu->aimage[base]);
alpha += tmp;
color += tmp * spu->image[base];
}
/* Finally mix these transparency and brightness information suitably */
base = spu->scaled_stride * y + x;
spu->scaled_image[base] = alpha > 0 ? color / alpha : 0;
spu->scaled_aimage[base] = alpha * scalex * scaley / 0x10000;
if (spu->scaled_aimage[base]) {
spu->scaled_aimage[base] = 256 - spu->scaled_aimage[base];
if (spu->scaled_aimage[base] + spu->scaled_image[base] > 255)
spu->scaled_image[base] = 256 - spu->scaled_aimage[base];
}
}
}
}
#endif
spu->scaled_frame_width = dxs;
spu->scaled_frame_height = dys;
}
}
if (spu->scaled_image)
draw_alpha(spu->scaled_start_col, spu->scaled_start_row, spu->scaled_width, spu->scaled_height,
spu->scaled_image, spu->scaled_aimage, spu->scaled_stride);
}
}
else
{
mp_msg(MSGT_SPUDEC,MSGL_DBG2,"SPU not displayed: start_pts=%d end_pts=%d now_pts=%d\n",
spu->start_pts, spu->end_pts, spu->now_pts);
}
}
void spudec_update_palette(void * this, unsigned int *palette)
{
spudec_handle_t *spu = (spudec_handle_t *) this;
if (spu && palette)
memcpy(spu->global_palette, palette, sizeof(spu->global_palette));
}
void *spudec_new_scaled(unsigned int *palette, unsigned int frame_width, unsigned int frame_height)
{
spudec_handle_t *this = calloc(1, sizeof(spudec_handle_t));
if (this) {
if (palette)
memcpy(this->global_palette, palette, sizeof(this->global_palette));
this->packet = NULL;
this->image = NULL;
this->scaled_image = NULL;
this->orig_frame_width = frame_width;
this->orig_frame_height = frame_height;
}
else
perror("FATAL: spudec_init: calloc");
return this;
}
/* get palette custom color, width, height from .idx file */
void *spudec_new_scaled_vobsub(unsigned int *palette, unsigned int *cuspal, unsigned int custom, unsigned int frame_width, unsigned int frame_height)
{
spudec_handle_t *this = calloc(1, sizeof(spudec_handle_t));
if (this){
if (palette){
memcpy(this->global_palette, palette, sizeof(this->global_palette));
memcpy(this->cuspal, cuspal, sizeof(this->cuspal));
}
//(fprintf(stderr,"VobSub Custom Palette: %d,%d,%d,%d", this->cuspal[0], this->cuspal[1], this->cuspal[2],this->cuspal[3]);
this->packet = NULL;
this->image = NULL;
this->scaled_image = NULL;
this->orig_frame_width = frame_width;
this->orig_frame_height = frame_height;
this->custom = custom;
}
else
perror("FATAL: spudec_init: calloc");
return this;
}
void *spudec_new(unsigned int *palette)
{
return spudec_new_scaled(palette, 0, 0);
}
void spudec_free(void *this)
{
spudec_handle_t *spu = (spudec_handle_t*)this;
if (spu) {
if (spu->packet)
free(spu->packet);
if (spu->scaled_image)
free(spu->scaled_image);
if (spu->image)
free(spu->image);
free(spu);
}
}
|