libavcodec/dctref.c File Reference

reference discrete cosine transform (double precision) More...

#include "libavutil/mathematics.h"

Go to the source code of this file.

Functions
av_cold void	ff_ref_dct_init (void)
	Initialize the double precision discrete cosine transform functions fdct & idct.
void	ff_ref_fdct (short *block)
	Transform 8x8 block of data with a double precision forward DCT This is a reference implementation.
void	ff_ref_idct (short *block)
	Transform 8x8 block of data with a double precision inverse DCT This is a reference implementation.
Variables
static double	coefficients [8 *8]

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Detailed Description

reference discrete cosine transform (double precision)

Author:

Dylan Yudaken (dyudaken at gmail)

Note:

This file could be optimized a lot, but is for reference and so readability is better.

Definition in file dctref.c.

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Function Documentation

av_cold void ff_ref_dct_init

(

void

)

Initialize the double precision discrete cosine transform functions fdct & idct.

Definition at line 39 of file dctref.c.

Referenced by main().

void ff_ref_fdct

(

short *

block

)

Transform 8x8 block of data with a double precision forward DCT
This is a reference implementation.

Parameters:

block

pointer to 8x8 block of data to transform

Definition at line 57 of file dctref.c.

Referenced by dct_error().

void ff_ref_idct

(

short *

block

)

Transform 8x8 block of data with a double precision inverse DCT
This is a reference implementation.

Parameters:

block

pointer to 8x8 block of data to transform

Definition at line 93 of file dctref.c.

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Variable Documentation

double coefficients[8 *8] [static]

Definition at line 33 of file dctref.c.

Referenced by ff_ref_dct_init(), ff_ref_fdct(), and ff_ref_idct().