img_idct_8x8.h64

dm642函数库

;* ======================================================================== *;
;*  TEXAS INSTRUMENTS, INC.                                                 *;
;*                                                                          *;
;*  IMGLIB  DSP Image/Video Processing Library                              *;
;*                                                                          *;
;*      Release:        Revision 1.04b                                      *;
;*      CVS Revision:   1.3     Fri Oct 25 00:29:08 2002 (UTC)              *;
;*      Snapshot date:  23-Oct-2003                                         *;
;*                                                                          *;
;*  This library contains proprietary intellectual property of Texas        *;
;*  Instruments, Inc.  The library and its source code are protected by     *;
;*  various copyrights, and portions may also be protected by patents or    *;
;*  other legal protections.                                                *;
;*                                                                          *;
;*  This software is licensed for use with Texas Instruments TMS320         *;
;*  family DSPs.  This license was provided to you prior to installing      *;
;*  the software.  You may review this license by consulting the file       *;
;*  TI_license.PDF which accompanies the files in this library.             *;
;* ------------------------------------------------------------------------ *;
;*          Copyright (C) 2003 Texas Instruments, Incorporated.             *;
;*                          All Rights Reserved.                            *;
;* ======================================================================== *;
;* ======================================================================== *;
;*  Assembler compatibility shim for assembling 4.30 and later code on      *;
;*  tools prior to 4.30.                                                    *;
;* ======================================================================== *;
;* ======================================================================== *;
;*  End of assembler compatibility shim.                                    *;
;* ======================================================================== *;
* ========================================================================= *
*   NAME                                                                    *
*       IMG_idct_8x8 -- Wrapper for idct_8x8_12q4, Little Endian.           *
*                                                                           *
*   REVISION DATE                                                           *
*       24-Oct-2002                                                         *
*                                                                           *
*   USAGE                                                                   *
*       This routine is C callable, and has the following C prototype:      *
*                                                                           *
*           void IMG_idct_8x8(short idct_data[], unsigned num_idcts)        *
*                                                                           *
*   DESCRIPTION                                                             *
*       This function provides a wrapper around the IMG_idct_8x8_12q4       *
*       function.  It reads 12Q0 values in from the input array, and        *
*       writes them back as 12Q4.  Once all the values have been adjusted,  *
*       the function then branches directly to IMG_idct_8x8_12q4.           *
*                                                                           *
*       It is strongly recommended that you adapt your code to call         *
*       IMG_idct_8x8_12q4 directly.  Calling this wrapper adds an extra     *
*       16 cycles per block of processing overhead, as well as 116          *
*       bytes of additional code.                                           *
*                                                                           *
*   ASSUMPTIONS                                                             *
*       This is a LITTLE ENDIAN implementation.                             *
*       The input array must be aligned on a double-word boundary.          *
*                                                                           *
*   MEMORY NOTE                                                             *
*       No bank conflicts occur.                                            *
*                                                                           *
*   NOTES                                                                   *
*       This code locks out interrupts for its entire duration.             *
*       It is, however, fully interrupt tolerant.                           *
*                                                                           *
*   CYCLES                                                                  *
*       cycles = 16 + 16 * num_idcts, for num_idcts > 0                     *
*                                                                           *
*   CODESIZE                                                                *
*       116 bytes                                                           *
* ------------------------------------------------------------------------- *
*             Copyright (c) 2003 Texas Instruments, Incorporated.           *
*                            All Rights Reserved.                           *
* ========================================================================= *

        .global _IMG_idct_8x8

* ========================================================================= *
*   End of file:  img_idct_8x8.h64                                          *
* ------------------------------------------------------------------------- *
*             Copyright (c) 2003 Texas Instruments, Incorporated.           *
*                            All Rights Reserved.                           *
* ========================================================================= *