libavcodec/jfdctfst.c File Reference

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

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

Go to the source code of this file.

Defines

#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)
#define FIX_0_541196100   ((int32_t) 139)
#define FIX_0_707106781   ((int32_t) 181)
#define FIX_1_306562965   ((int32_t) 334)
#define DESCALE(x, n)   RIGHT_SHIFT(x, n)
#define MULTIPLY(var, const)   ((DCTELEM) DESCALE((var) * (const), CONST_BITS))

Functions

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


Detailed Description

Independent JPEG Group's fast AAN dct.

Definition in file jfdctfst.c.


Define Documentation

#define CONST_BITS   8

#define DCTSIZE   8

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

#define FIX_0_382683433   ((int32_t) 98)

Definition at line 116 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), and row_fdct().

#define FIX_0_541196100   ((int32_t) 139)

#define FIX_0_707106781   ((int32_t) 181)

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)

Definition at line 119 of file jfdctfst.c.

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

#define GLOBAL (  )     x

Definition at line 75 of file jfdctfst.c.

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

Definition at line 143 of file jfdctfst.c.

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

Definition at line 76 of file jfdctfst.c.


Function Documentation

ff_fdct_ifast ( DCTELEM data  ) 

Definition at line 208 of file jfdctfst.c.

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

ff_fdct_ifast248 ( DCTELEM data  ) 

Definition at line 274 of file jfdctfst.c.

Referenced by ff_dsputil_init().

static av_always_inline void row_fdct ( DCTELEM data  )  [static]

Definition at line 145 of file jfdctfst.c.


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