libavcodec/eaidct.c File Reference

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

#include "dsputil.h"

Go to the source code of this file.

Defines
#define	ASQRT   181
#define	A4   669
#define	A2   277
#define	A5   196
#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 (DCTELEM *dest, const DCTELEM *src)
void	ff_ea_idct_put_c (uint8_t *dest, int linesize, DCTELEM *block)

---

Detailed Description

Electronic Arts TGQ/TQI/MAD IDCT algorithm.

Author:

Peter Ross <pross@xvid.org>

Definition in file eaidct.c.

---

Define Documentation

#define A2   277

Definition at line 32 of file eaidct.c.

#define A4   669

Definition at line 31 of file eaidct.c.

#define A5   196

Definition at line 33 of file eaidct.c.

Referenced by ff_faandct(), and row_fdct().

#define ASQRT   181

Definition at line 30 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 60 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 63 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); \
}

Definition at line 35 of file eaidct.c.

#define MUNGE_8BIT

(

x

)

av_clip_uint8((x)>>4)

Definition at line 62 of file eaidct.c.

#define MUNGE_NONE

(

x

)

(x)

Definition at line 59 of file eaidct.c.

---

Function Documentation

static void ea_idct_col	(	DCTELEM *	dest,
		const DCTELEM *	src
	)			[inline, static]

Definition at line 65 of file eaidct.c.

Referenced by ff_ea_idct_put_c().

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

Definition at line 79 of file eaidct.c.

Referenced by dsputil_init().