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"

Go to the source code of this file.

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
static av_always_inline void	row_fdct (int16_t *data)
	ff_fdct_ifast (int16_t *data)
	ff_fdct_ifast248 (int16_t *data)

Detailed Description

Independent JPEG Group's fast AAN dct.

Definition in file jfdctfst.c.

Macro Definition Documentation

#define DCTSIZE   8

Definition at line 74 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), ff_fdct_ifast248(), ff_j_rev_dct(), ff_j_rev_dct4(), and row_fdct().

#define GLOBAL

(

x

)

x

Definition at line 75 of file jfdctfst.c.

#define RIGHT_SHIFT	(		x,
			n
	)		((x) >> (n))

Definition at line 76 of file jfdctfst.c.

#define CONST_BITS   8

Definition at line 105 of file jfdctfst.c.

#define FIX_0_382683433   ((int32_t) 98) /* FIX(0.382683433) */

Definition at line 116 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), and row_fdct().

#define FIX_0_541196100   ((int32_t) 139) /* FIX(0.541196100) */

Definition at line 117 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), and row_fdct().

#define FIX_0_707106781   ((int32_t) 181) /* FIX(0.707106781) */

Definition at line 118 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), ff_fdct_ifast248(), and row_fdct().

#define FIX_1_306562965   ((int32_t) 334) /* FIX(1.306562965) */

Definition at line 119 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), and row_fdct().

#define DESCALE	(		x,
			n
	)		RIGHT_SHIFT(x, n)

Definition at line 135 of file jfdctfst.c.

#define MULTIPLY	(		var,
			const
	)		((int16_t) DESCALE((var) * (const), CONST_BITS))

Definition at line 143 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), ff_fdct_ifast248(), and row_fdct().

Function Documentation

static av_always_inline void row_fdct ( int16_t *  data )

static

Definition at line 145 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), and ff_fdct_ifast248().

ff_fdct_ifast

(

int16_t *

data

)

Definition at line 208 of file jfdctfst.c.

Referenced by dct_quantize_trellis_c(), ff_convert_matrix(), and ff_fdctdsp_init().

ff_fdct_ifast248

(

int16_t *

data

)

Definition at line 274 of file jfdctfst.c.

Referenced by ff_fdctdsp_init().