omxicjp_dctfwd_s16.c

来自「The OpenMAX DL (Development Layer) APIs 」· C语言 代码 · 共 77 行

/**
 * 
 * File Name:  omxICJP_DCTFwd_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
 *
 */

#include "omxtypes.h"
#include "armOMX.h"
#include "armCOMM.h"

#include "omxIC.h"
#include "armIC.h"

/**
 * Function:  omxICJP_DCTFwd_S16   (5.1.3.2.4)
 *
 * Description:
 * Performs an 8x8 block forward discrete cosine transform (DCT).  This 
 * function implements forward DCT for the 8-bit image data (packed into 
 * signed 16-bit).  The output matrix is the transpose of the explicit result. 
 *  As a result, the Huffman coding functions in this library handle transpose 
 * as well. 
 *
 * Input Arguments:
 *   
 *   pSrc - pointer to the input data block (8x8) buffer.  The data must be 
 *            arranged in raster scan order, and the buffer start address must 
 *            be 8-byte aligned.  The input components are bounded on the 
 *            interval [-128, 127]. 
 *
 * Output Arguments:
 *   
 *   pDst - pointer to the output DCT coefficient block(8x8) buffer. This 
 *            start address must be 8-byte aligned. To achieve better 
 *            performance, the output 8x8 matrix is the transpose of the 
 *            explicit result. This transpose can be handled in later 
 *            processing stages (e.g. 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 the start address of a pointer 
 *              was not 8-byte aligned. 
 *
 */

OMXResult omxICJP_DCTFwd_S16(
     const OMX_S16* pSrc,
     OMX_S16 *pDst
 )
{
    /* Argument Checks */
    armRetArgErrIf( pSrc == NULL, OMX_Sts_BadArgErr)
    armRetArgErrIf( pDst == NULL, OMX_Sts_BadArgErr)
    
    armRetArgErrIf( armNot8ByteAligned(pSrc), OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pDst), OMX_Sts_BadArgErr)
    
    /* Processing */
    armICJP_DCTQuantFwd_S16(pSrc, pDst, NULL);

    return OMX_Sts_NoErr;
}

/*End of File*/