omxicjp_dctquantfwd_s16.c

来自「The OpenMAX DL (Development Layer) APIs 」· C语言 代码 · 共 80 行

/**
 * 
 * File Name:  omxICJP_DCTQuantFwd_S16.c
 * OpenMAX DL: v1.0.2
 * Revision:   10586
 * Date:       Wednesday, March 5, 2008
 * 
 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
 * 
 * 
 *
 * Description:
 * This file contains module for FDCT with quantization
 *
 */

#include "omxtypes.h"
#include "armOMX.h"
#include "omxIC.h"

#include "armIC.h"
#include "armCOMM.h"

/**
 * Function:  omxICJP_DCTQuantFwd_S16   (5.1.3.2.2)
 *
 * Description:
 * Computes the forward DCT and quantizes the output coefficients for 8-bit 
 * image data; processes a single 8x8 block. 
 *
 * Input Arguments:
 *   
 *   pSrc - pointer to the input data block (8x8) buffer; must be arranged in 
 *            raster scan order and 8-byte aligned. The input components 
 *            should be bounded on the interval [-128, 127]. 
 *   pQuantFwdTable - pointer to the 64-entry quantization table generated 
 *            using DCTQuantFwdTableInit; must be aligned on an 8-byte 
 *            boundary. 
 *
 * Output Arguments:
 *   
 *   pDst - pointer to the output transform coefficient block (8x8) buffer; 
 *            must be 8-byte aligned.  The output 8x8 matrix is the transpose 
 *            of the explicit result; this transpose will be handled in 
 *            Huffman encoding. 
 *
 * Return Value:
 *    
 *    OMX_Sts_NoErr - no error 
 *    OMX_Sts_BadArgErr - Bad arguments. Returned for any of the following 
 *              conditions: 
 *    -    a pointer was NULL 
 *    -    one of the following pointers not 8-byte aligned: pSrc, pDst, or 
 *              pQuantFwdTable. 
 *
 */

OMXResult omxICJP_DCTQuantFwd_S16(
     const OMX_S16* pSrc,
     OMX_S16 *pDst,
     const OMX_U16 *pQuantFwdTable
 )
{

    /* Argument Checks */
    armRetArgErrIf( pSrc == NULL, OMX_Sts_BadArgErr)
    armRetArgErrIf( pDst == NULL, OMX_Sts_BadArgErr)
    
    armRetArgErrIf( pQuantFwdTable == NULL            , OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pSrc)          , OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pDst)          , OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pQuantFwdTable), OMX_Sts_BadArgErr)
    
    /* Processing */
    armICJP_DCTQuantFwd_S16(pSrc, pDst, pQuantFwdTable);
 
    return OMX_Sts_NoErr;    

}