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eaidct.c File Reference

Electronic Arts TGQ/TQI/MAD IDCT algorithm. More...

#include "eaidct.h"
#include "libavutil/common.h"

Go to the source code of this file.

Macros

#define ASQRT   181 /* (1/sqrt(2))<<8 */
 
#define A4   669 /* cos(pi/8)*sqrt(2)<<9 */
 
#define A2   277 /* sin(pi/8)*sqrt(2)<<9 */
 
#define A5   196 /* sin(pi/8)<<9 */
 
#define IDCT_TRANSFORM(dest, s0, s1, s2, s3, s4, s5, s6, s7, d0, d1, d2, d3, d4, d5, d6, d7, munge, src)
 
#define MUNGE_NONE(x)   (x)
 
#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)
 
#define MUNGE_8BIT(x)   av_clip_uint8((x)>>4)
 
#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)
 

Functions

static void ea_idct_col (int16_t *dest, const int16_t *src)
 
void ff_ea_idct_put_c (uint8_t *dest, int linesize, int16_t *block)
 

Detailed Description

Electronic Arts TGQ/TQI/MAD IDCT algorithm.

Author
Peter Ross pross.nosp@m.@xvi.nosp@m.d.org

Definition in file eaidct.c.

Macro Definition Documentation

#define ASQRT   181 /* (1/sqrt(2))<<8 */

Definition at line 31 of file eaidct.c.

#define A4   669 /* cos(pi/8)*sqrt(2)<<9 */

Definition at line 32 of file eaidct.c.

#define A2   277 /* sin(pi/8)*sqrt(2)<<9 */

Definition at line 33 of file eaidct.c.

#define A5   196 /* sin(pi/8)<<9 */

Definition at line 34 of file eaidct.c.

#define IDCT_TRANSFORM (   dest,
  s0,
  s1,
  s2,
  s3,
  s4,
  s5,
  s6,
  s7,
  d0,
  d1,
  d2,
  d3,
  d4,
  d5,
  d6,
  d7,
  munge,
  src 
)
Value:
{\
const int a1 = (src)[s1] + (src)[s7]; \
const int a7 = (src)[s1] - (src)[s7]; \
const int a5 = (src)[s5] + (src)[s3]; \
const int a3 = (src)[s5] - (src)[s3]; \
const int a2 = (src)[s2] + (src)[s6]; \
const int a6 = (ASQRT*((src)[s2] - (src)[s6]))>>8; \
const int a0 = (src)[s0] + (src)[s4]; \
const int a4 = (src)[s0] - (src)[s4]; \
const int b0 = (((A4-A5)*a7 - A5*a3)>>9) + a1+a5; \
const int b1 = (((A4-A5)*a7 - A5*a3)>>9) + ((ASQRT*(a1-a5))>>8); \
const int b2 = (((A2+A5)*a3 + A5*a7)>>9) + ((ASQRT*(a1-a5))>>8); \
const int b3 = ((A2+A5)*a3 + A5*a7)>>9; \
(dest)[d0] = munge(a0+a2+a6+b0); \
(dest)[d1] = munge(a4+a6 +b1); \
(dest)[d2] = munge(a4-a6 +b2); \
(dest)[d3] = munge(a0-a2-a6+b3); \
(dest)[d4] = munge(a0-a2-a6-b3); \
(dest)[d5] = munge(a4-a6 -b2); \
(dest)[d6] = munge(a4+a6 -b1); \
(dest)[d7] = munge(a0+a2+a6-b0); \
}
#define a0
Definition: regdef.h:46
#define a1
Definition: regdef.h:47
#define src
Definition: vp8dsp.c:254
#define a3
Definition: regdef.h:49
#define s2
Definition: regdef.h:39
#define s0
Definition: regdef.h:37
#define s5
Definition: regdef.h:42
#define a2
Definition: regdef.h:48
#define s4
Definition: regdef.h:41
#define ASQRT
Definition: eaidct.c:31
#define s3
Definition: regdef.h:40
#define a5
Definition: regdef.h:51
#define s1
Definition: regdef.h:38
#define A5
Definition: eaidct.c:34
#define A2
Definition: eaidct.c:33
#define a4
Definition: regdef.h:50
#define s6
Definition: regdef.h:43
#define A4
Definition: eaidct.c:32

Definition at line 36 of file eaidct.c.

#define MUNGE_NONE (   x)    (x)

Definition at line 60 of file eaidct.c.

#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)

Definition at line 61 of file eaidct.c.

Referenced by ea_idct_col().

#define MUNGE_8BIT (   x)    av_clip_uint8((x)>>4)

Definition at line 63 of file eaidct.c.

#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)

Definition at line 64 of file eaidct.c.

Referenced by ff_ea_idct_put_c().

Function Documentation

static void ea_idct_col ( int16_t *  dest,
const int16_t *  src 
)
inlinestatic

Definition at line 66 of file eaidct.c.

Referenced by ff_ea_idct_put_c().

void ff_ea_idct_put_c ( uint8_t dest,
int  linesize,
int16_t *  block 
)

Definition at line 80 of file eaidct.c.

Referenced by idct_put(), tgq_idct_put_mb(), and tqi_idct_put().