omxicjp_dctquantfwdtableinit.c

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

/**
 * 
 * File Name:  omxICJP_DCTQuantFwdTableInit.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 table initialization for IDCT
 *
 */

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

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

/**
 * Function:  omxICJP_DCTQuantFwdTableInit   (5.1.3.2.1)
 *
 * Description:
 * Initializes the JPEG DCT quantization table for 8-bit per component image 
 * data. 
 *
 * Input Arguments:
 *   
 *   pQuantRawTable - pointer to the raw quantization table; must be arranged 
 *            in raster scan order and aligned on an 8-byte boundary.  The 
 *            table must contain 64 entries.  Table entries should lie within 
 *            the range [1,255]. 
 *
 * Output Arguments:
 *   
 *   pQuantFwdTable - pointer to the initialized quantization table; must be 
 *            aligned on an 8-byte boundary.  The table must contain 64 
 *            entries, and the implementation-specific contents must match the 
 *            table contents expected by the associated set of forward DCT 
 *            quantization functions in the same OpenMAX DL implementation, 
 *            including the functions DCTQuantFwd_S16, DCTQuantFwd_S16_I, and 
 *            DCTQuantFwd_Multiple_S16. 
 *
 * 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. 
 *    -    one or more of the entries is equal to 0 in the table referenced 
 *              by pQuantRawTable. 
 *
 */
OMXResult omxICJP_DCTQuantFwdTableInit(
     const OMX_U8 *pQuantRawTable,
     OMX_U16 *pQuantFwdTable
 )
{
    OMX_INT i,j;
    OMX_F64 coef;

    /* Argument Checks */
    armRetArgErrIf( pQuantRawTable == NULL, OMX_Sts_BadArgErr)
    armRetArgErrIf( pQuantFwdTable == NULL, OMX_Sts_BadArgErr)
    
    armRetArgErrIf( armNot8ByteAligned(pQuantFwdTable), OMX_Sts_BadArgErr)
    armRetArgErrIf( armNot8ByteAligned(pQuantRawTable), OMX_Sts_BadArgErr)

    /* Processing */
    for (i = 0; i < 8 ; i++)
    {
        for (j = 0; j < 8 ; j++)
        {
            /* calculate scale multiplier */
            coef = (1.0 / pQuantRawTable[i*8+j]);
            pQuantFwdTable[i*8+j] = (OMX_U16)armSatRoundFloatToU16(coef * (1 << ARM_ICJP_QUANT_Q) );
        }
    }

    return OMX_Sts_NoErr;
}

/*End of File*/