omxicjp_dctquantinv_multiple_s16.c

The OpenMAX DL (Development Layer) APIs contain a comprehensive set of audio, video, signal processi

/**
 * 
 * File Name:  omxICJP_DCTQuantInv_Multiple_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 multiple block IDCT with de-quantization
 *
 */

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

#include "armCOMM.h"

/**
 * Function:  omxICJP_DCTQuantInv_Multiple_S16   (5.1.3.3.6)
 *
 * Description:
 * Multiple block dequantization and IDCT function. This function implements 
 * inverse DCT with dequantization for 8-bit image data.  It processes 
 * multiple blocks (each 8x8). The blocks are assumed to be part of a 
 * planarized buffer.  This function should be called separately for luma and 
 * chroma buffers with the respective quantization table.  The start address 
 * of pQuantInvTable must be 8-byte aligned. 
 *
 * Input Arguments:
 *   
 *   pSrc - pointer to the start of the first 8x8 coefficient block in the 
 *            input buffer, which should contain a total of nBlocks x 8 x 8 
 *            coefficients stored contiguously.  The coefficients within each 
 *            block must be arranged in raster scan order, and the start 
 *            address must be 8-byte aligned.  Buffer values should lie in the 
 *            range [-2040, 2040]. 
 *   nBlocks - the number of 8x8 blocks to be processed. 
 *   pQuantInvTable - pointer to the quantization table initialized using the 
 *            function DCTQuantInvTableInit.  The table contains 64 entries 
 *            and the start address must be 8-byte aligned.. 
 *
 * Output Arguments:
 *   
 *   pDst - pointer to the start of the first 8x8 output pixel block in the 
 *            multi-block output buffer; must be 8-byte aligned.  The buffer 
 *            referenced by pDst must have sufficient free space to contain 
 *            nBlocks blocks of 8x8 pixels stored contiguously. 
 *
 * Return Value:
 *    
 *    OMX_Sts_NoErr - no error 
 *    OMX_Sts_BadArgErr - Bad arguments. Returned for any of the following 
 *              conditions: 
 *    -   one or more of the following pointers was NULL: pSrc, pDst, or 
 *              pQuantInvTable 
 *    -    one or more of the following pointers was not 8-byte aligned: 
 *              pSrc, pDst, or pQuantInvTable. 
 *
 */
 
OMXResult omxICJP_DCTQuantInv_Multiple_S16(
     const OMX_S16 *pSrc,
     OMX_S16 *pDst,
     OMX_INT nBlocks,
     const OMX_U32 *pQuantInvTable
 )
{
    
    OMX_INT   blockNum;
   
    /* Argument Checks */
    armRetArgErrIf( pSrc    == NULL, OMX_Sts_BadArgErr)
    armRetArgErrIf( pDst    == NULL, OMX_Sts_BadArgErr)
    armRetArgErrIf( nBlocks <  1   , OMX_Sts_BadArgErr)
    
    armRetArgErrIf( pQuantInvTable == NULL            , OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pSrc)          , OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pDst)          , OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pQuantInvTable), OMX_Sts_BadArgErr)
    
    /* Processing */
    for (blockNum = 0 ; blockNum < nBlocks ; blockNum++)
    {
        omxICJP_DCTQuantInv_S16(pSrc,pDst,pQuantInvTable);
        
        pSrc += 64;
        pDst += 64;
    }

    return OMX_Sts_NoErr;
}

/*End of File*/