2 * Electronic Arts TGQ/TQI/MAD IDCT algorithm
3 * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Electronic Arts TGQ/TQI/MAD IDCT algorithm
25 * @author Peter Ross <pross@xvid.org>
29 #include "libavutil/common.h"
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 */
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); \
58 /* end IDCT_TRANSFORM macro */
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)
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)
66 static inline void ea_idct_col(int16_t *dest
, const int16_t *src
) {
67 if ((src
[8]|src
[16]|src
[24]|src
[32]|src
[40]|src
[48]|src
[56])==0) {
80 void ff_ea_idct_put_c(uint8_t *dest
, int linesize
, int16_t *block
) {
85 ea_idct_col(&temp
[i
], &block
[i
]);
87 IDCT_ROW( (&dest
[i
*linesize
]), (&temp
[8*i
]) );