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

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

Include dependency graph for eaidct.c:

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

Definition at line 33 of file eaidct.c.

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

Definition at line 32 of file eaidct.c.

#define A5 196 /* sin(pi/8)<<9 */

Definition at line 34 of file eaidct.c.

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

Definition at line 31 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 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().

#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); \
}