idct.asm

快速离散余弦变换程序

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*      (C)  COPYRIGHT TEXAS INSTRUMENTS, INC. 1996            *
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*  FILE NAME:  IDCT.ASM                                       *
*                                                             *
*  HISTORY:  This program is originally written in TMS320C5x  *
*            assembly language by Braganti Herve of Texas     *
*            Instruments, Inc.                                *
*                                                             *
*  TRANSLATORS:  Rushani Wirasinghe                           *
*                Xiaozhen Zhang                               *
*                Simon Lau                                    *
*                                                             *
*  DESCRIPTION:                                               *
*  -  Inverse Discrete Cosine Transform (IDCT) algorithm.     *
*  -  Code written in TMS320C54x assembly language.           *
*  -  Files:  idct.asm      (This file)                       *
*             idct.cmd      (Linker Command File)             *
*                                                             *
*  LAST DAY MODIFIED:  August 23, 1996                        *
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*                  +----------------------------------------+             
*                  !              INVERSE                   !             
*                  !    8*8  Discrete Cosinus Transform     !             
*                  !                                        !             
*                  ! Implementation on TMS320C54X assembler !
*                  !                                        !             
*                  !   1440 CYCLES WITHOUT INPUT/OUTPUT SUB-!             
*                  !   ROUTINE                              !             
*                  +----------------------------------------+             
*
*
*   THEORY:
*   
*
*      for a two-dimensional form the IDCT can be described as:
*
*
*			    N-1 N-1
*   x(k,l)=  (2/N)