xref: /frameworks/av/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_CompareMV.c

/**
 *
 * File Name:  armVCM4P2_CompareMV.c
 * OpenMAX DL: v1.0.2
 * Revision:   9641
 * Date:       Thursday, February 7, 2008
 *
 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
 *
 *
 *
 * Description:
 * Contains module for comparing motion vectors and SAD's to decide
 * the best MV and SAD
 *
 */

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

#include "armVC.h"
#include "armCOMM.h"

/**
 * Function: armVCM4P2_CompareMV
 *
 * Description:
 * Performs comparision of motion vectors and SAD's to decide the
 * best MV and SAD
 *
 * Remarks:
 *
 * Parameters:
 * [in]	    mvX		x coordinate of the candidate motion vector
 * [in]	    mvY		y coordinate of the candidate motion vector
 * [in]	    candSAD	Candidate SAD
 * [in]	    bestMVX	x coordinate of the best motion vector
 * [in]	    bestMVY	y coordinate of the best motion vector
 * [in]	    bestSAD	best SAD
 *
 * Return Value:
 * OMX_INT -- 1 to indicate that the current sad is the best
 *            0 to indicate that it is NOT the best SAD
 */

OMX_INT armVCM4P2_CompareMV (
    OMX_S16 mvX,
    OMX_S16 mvY,
    OMX_INT candSAD,
    OMX_S16 bestMVX,
    OMX_S16 bestMVY,
    OMX_INT bestSAD
)
{
    if (candSAD < bestSAD)
    {
        return 1;
    }
    if (candSAD > bestSAD)
    {
        return 0;
    }
    /* shorter motion vector */
    if ( (mvX * mvX + mvY * mvY) < (bestMVX*bestMVX+bestMVY*bestMVY) )
    {
         return 1;
    }
    return 0;
}

/*End of File*/