#include <stdint.h>
#include "libavutil/attributes.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
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

◆ DCTSIZE

#define DCTSIZE 8

Definition at line 73 of file jfdctfst.c.

◆ GLOBAL

#define GLOBAL ( x ) x

Definition at line 74 of file jfdctfst.c.

◆ RIGHT_SHIFT

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

Definition at line 75 of file jfdctfst.c.

◆ CONST_BITS

#define CONST_BITS 8

Definition at line 104 of file jfdctfst.c.

◆ FIX_0_382683433

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

Definition at line 115 of file jfdctfst.c.

◆ FIX_0_541196100

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

Definition at line 116 of file jfdctfst.c.

◆ FIX_0_707106781

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

Definition at line 117 of file jfdctfst.c.

◆ FIX_1_306562965

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

Definition at line 118 of file jfdctfst.c.

◆ DESCALE

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

Definition at line 134 of file jfdctfst.c.

◆ MULTIPLY

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

Definition at line 142 of file jfdctfst.c.

Function Documentation

◆ row_fdct()

static av_always_inline void row_fdct ( int16_t * data )

static

Definition at line 144 of file jfdctfst.c.

Referenced by ff_fdct_ifast(), and ff_fdct_ifast248().

◆ ff_fdct_ifast()

ff_fdct_ifast ( int16_t * data )

Definition at line 207 of file jfdctfst.c.

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

◆ ff_fdct_ifast248()

ff_fdct_ifast248 ( int16_t * data )

Definition at line 273 of file jfdctfst.c.

Referenced by ff_fdctdsp_init().

Macros

Functions