jfdctfst.c File Reference

Independent JPEG Group's fast AAN dct. More...

#include <stdlib.h>
#include <stdio.h>
#include "libavutil/common.h"
#include "dct.h"

Macros
#define	DCTSIZE   8
#define	GLOBAL(x)   x
#define	RIGHT_SHIFT(x, n)   ((x) >> (n))
#define	CONST_BITS   8
#define	FIX_0_382683433   ((int32_t) 98) /* FIX(0.382683433) */
#define	FIX_0_541196100   ((int32_t) 139) /* FIX(0.541196100) */
#define	FIX_0_707106781   ((int32_t) 181) /* FIX(0.707106781) */
#define	FIX_1_306562965   ((int32_t) 334) /* FIX(1.306562965) */
#define	DESCALE(x, n)   RIGHT_SHIFT(x, n)
#define	MULTIPLY(var, const)   ((int16_t) DESCALE((var) * (const), CONST_BITS))

Functions
	ff_fdct_ifast (int16_t *data)
	ff_fdct_ifast248 (int16_t *data)

Detailed Description

Independent JPEG Group's fast AAN dct.