1 |
|
|
/* |
2 |
|
|
* Electronic Arts TGQ/TQI/MAD IDCT algorithm |
3 |
|
|
* Copyright (c) 2007-2008 Peter Ross <pross@xvid.org> |
4 |
|
|
* |
5 |
|
|
* This file is part of FFmpeg. |
6 |
|
|
* |
7 |
|
|
* FFmpeg is free software; you can redistribute it and/or |
8 |
|
|
* modify it under the terms of the GNU Lesser General Public |
9 |
|
|
* License as published by the Free Software Foundation; either |
10 |
|
|
* version 2.1 of the License, or (at your option) any later version. |
11 |
|
|
* |
12 |
|
|
* FFmpeg is distributed in the hope that it will be useful, |
13 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 |
|
|
* Lesser General Public License for more details. |
16 |
|
|
* |
17 |
|
|
* You should have received a copy of the GNU Lesser General Public |
18 |
|
|
* License along with FFmpeg; if not, write to the Free Software |
19 |
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 |
|
|
*/ |
21 |
|
|
|
22 |
|
|
/** |
23 |
|
|
* @file |
24 |
|
|
* Electronic Arts TGQ/TQI/MAD IDCT algorithm |
25 |
|
|
* @author Peter Ross <pross@xvid.org> |
26 |
|
|
*/ |
27 |
|
|
|
28 |
|
|
#include "eaidct.h" |
29 |
|
|
#include "libavutil/common.h" |
30 |
|
|
|
31 |
|
|
#define ASQRT 181 /* (1/sqrt(2))<<8 */ |
32 |
|
|
#define A4 669 /* cos(pi/8)*sqrt(2)<<9 */ |
33 |
|
|
#define A2 277 /* sin(pi/8)*sqrt(2)<<9 */ |
34 |
|
|
#define A5 196 /* sin(pi/8)<<9 */ |
35 |
|
|
|
36 |
|
|
#define IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) {\ |
37 |
|
|
const int a1 = (src)[s1] + (src)[s7]; \ |
38 |
|
|
const int a7 = (src)[s1] - (src)[s7]; \ |
39 |
|
|
const int a5 = (src)[s5] + (src)[s3]; \ |
40 |
|
|
const int a3 = (src)[s5] - (src)[s3]; \ |
41 |
|
|
const int a2 = (src)[s2] + (src)[s6]; \ |
42 |
|
|
const int a6 = (ASQRT*((src)[s2] - (src)[s6]))>>8; \ |
43 |
|
|
const int a0 = (src)[s0] + (src)[s4]; \ |
44 |
|
|
const int a4 = (src)[s0] - (src)[s4]; \ |
45 |
|
|
const int b0 = (((A4-A5)*a7 - A5*a3)>>9) + a1+a5; \ |
46 |
|
|
const int b1 = (((A4-A5)*a7 - A5*a3)>>9) + ((ASQRT*(a1-a5))>>8); \ |
47 |
|
|
const int b2 = (((A2+A5)*a3 + A5*a7)>>9) + ((ASQRT*(a1-a5))>>8); \ |
48 |
|
|
const int b3 = ((A2+A5)*a3 + A5*a7)>>9; \ |
49 |
|
|
(dest)[d0] = munge(a0+a2+a6+b0); \ |
50 |
|
|
(dest)[d1] = munge(a4+a6 +b1); \ |
51 |
|
|
(dest)[d2] = munge(a4-a6 +b2); \ |
52 |
|
|
(dest)[d3] = munge(a0-a2-a6+b3); \ |
53 |
|
|
(dest)[d4] = munge(a0-a2-a6-b3); \ |
54 |
|
|
(dest)[d5] = munge(a4-a6 -b2); \ |
55 |
|
|
(dest)[d6] = munge(a4+a6 -b1); \ |
56 |
|
|
(dest)[d7] = munge(a0+a2+a6-b0); \ |
57 |
|
|
} |
58 |
|
|
/* end IDCT_TRANSFORM macro */ |
59 |
|
|
|
60 |
|
|
#define MUNGE_NONE(x) (x) |
61 |
|
|
#define IDCT_COL(dest,src) IDCT_TRANSFORM(dest,0,8,16,24,32,40,48,56,0,8,16,24,32,40,48,56,MUNGE_NONE,src) |
62 |
|
|
|
63 |
|
|
#define MUNGE_8BIT(x) av_clip_uint8((x)>>4) |
64 |
|
|
#define IDCT_ROW(dest,src) IDCT_TRANSFORM(dest,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,MUNGE_8BIT,src) |
65 |
|
|
|
66 |
|
2483072 |
static inline void ea_idct_col(int16_t *dest, const int16_t *src) { |
67 |
✓✓ |
2483072 |
if ((src[8]|src[16]|src[24]|src[32]|src[40]|src[48]|src[56])==0) { |
68 |
|
1910398 |
dest[0] = |
69 |
|
1910398 |
dest[8] = |
70 |
|
1910398 |
dest[16] = |
71 |
|
1910398 |
dest[24] = |
72 |
|
1910398 |
dest[32] = |
73 |
|
1910398 |
dest[40] = |
74 |
|
1910398 |
dest[48] = |
75 |
|
1910398 |
dest[56] = src[0]; |
76 |
|
|
}else |
77 |
|
572674 |
IDCT_COL(dest, src); |
78 |
|
2483072 |
} |
79 |
|
|
|
80 |
|
310384 |
void ff_ea_idct_put_c(uint8_t *dest, ptrdiff_t linesize, int16_t *block) |
81 |
|
|
{ |
82 |
|
|
int i; |
83 |
|
|
int16_t temp[64]; |
84 |
|
310384 |
block[0] += 4; |
85 |
✓✓ |
2793456 |
for (i=0; i<8; i++) |
86 |
|
2483072 |
ea_idct_col(&temp[i], &block[i]); |
87 |
✓✓ |
2793456 |
for (i=0; i<8; i++) |
88 |
|
2483072 |
IDCT_ROW( (&dest[i*linesize]), (&temp[8*i]) ); |
89 |
|
310384 |
} |