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.

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)   ((DCTELEM) DESCALE((var) * (const), CONST_BITS))

Functions

static av_always_inline void row_fdct (DCTELEM *data)
 fdct_ifast (DCTELEM *data)
 fdct_ifast248 (DCTELEM *data)

Detailed Description

Independent JPEG Group's fast AAN dct.

Definition in file jfdctfst.c.

Macro Definition Documentation

#define CONST_BITS   8

Definition at line 105 of file jfdctfst.c.

#define DCTSIZE   8

Definition at line 74 of file jfdctfst.c.

Referenced by fdct_ifast(), fdct_ifast248(), j_rev_dct(), j_rev_dct4(), and row_fdct().

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

Definition at line 135 of file jfdctfst.c.

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

Definition at line 116 of file jfdctfst.c.

Referenced by 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 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 fdct_ifast(), 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 fdct_ifast(), and row_fdct().

#define GLOBAL (   x)    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.

Referenced by fdct_ifast(), fdct_ifast248(), and row_fdct().

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

Definition at line 76 of file jfdctfst.c.

Function Documentation

fdct_ifast ( DCTELEM data)

Definition at line 208 of file jfdctfst.c.

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

fdct_ifast248 ( DCTELEM data)

Definition at line 274 of file jfdctfst.c.

Referenced by dsputil_init().

static av_always_inline void row_fdct ( DCTELEM data)
static

Definition at line 145 of file jfdctfst.c.

Referenced by fdct_ifast(), and fdct_ifast248().