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/**
*
* File Name: omxVCM4P2_BlockMatch_Half_8x8.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* Description:
* Contains modules for Block matching, a full search algorithm
* is implemented
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armVC.h"
#include "armCOMM.h"
/**
* Function: omxVCM4P2_BlockMatch_Half_8x8 (6.2.4.2.4)
*
* Description:
* Performs an 8x8 block match with half-pixel resolution. Returns the
* estimated motion vector and associated minimum SAD. This function
* estimates the half-pixel motion vector by interpolating the integer
* resolution motion vector referenced by the input parameter pSrcDstMV, i.e.,
* the initial integer MV is generated externally. The input parameters
* pSrcRefBuf and pSearchPointRefPos should be shifted by the winning MV of
* 8x8 integer search prior to calling BlockMatch_Half_8x8. The function
* BlockMatch_Integer_8x8 may be used for integer motion estimation.
*
* Input Arguments:
*
* pSrcRefBuf - pointer to the reference Y plane; points to the reference
* block that corresponds to the location of the current 8x8 block
* in the current plane.
* refWidth - width of the reference plane
* pRefRect - reference plane valid region rectangle
* pSrcCurrBuf - pointer to the current block in the current macroblock
* buffer extracted from the original plane (linear array, 128
* entries); must be aligned on a 8-byte boundary. The number of
* bytes between lines (step) is 16.
* pSearchPointRefPos - position of the starting point for half pixel
* search (specified in terms of integer pixel units) in the
* reference plane.
* rndVal - rounding control parameter: 0 - disabled; 1 - enabled.
* pSrcDstMV - pointer to the initial MV estimate; typically generated
* during a prior 8x8 integer search, specified in terms of
* half-pixel units.
*
* Output Arguments:
*
* pSrcDstMV - pointer to estimated MV
* pDstSAD - pointer to minimum SAD
*
* Return Value:
*
* OMX_Sts_NoErr - no error
* OMX_Sts_BadArgErr - bad arguments. Returned if one of the following
* conditions is true:
* - at least one of the following pointers is NULL:
* pSrcRefBuf, pRefRect, pSrcCurrBuff, pSearchPointRefPos, pSrcDstMV
* - pSrcCurrBuf is not 8-byte aligned
*
*/
OMXResult omxVCM4P2_BlockMatch_Half_8x8(
const OMX_U8 *pSrcRefBuf,
OMX_INT refWidth,
const OMXRect *pRefRect,
const OMX_U8 *pSrcCurrBuf,
const OMXVCM4P2Coordinate *pSearchPointRefPos,
OMX_INT rndVal,
OMXVCMotionVector *pSrcDstMV,
OMX_INT *pDstSAD
)
{
/* For a blocksize of 8x8 */
OMX_U8 BlockSize = 8;
/* Argument error checks */
armRetArgErrIf(pSrcRefBuf == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pRefRect == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pSrcCurrBuf == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pSearchPointRefPos == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(pSrcDstMV == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(!armIs8ByteAligned(pSrcCurrBuf), OMX_Sts_BadArgErr);
return (armVCM4P2_BlockMatch_Half(
pSrcRefBuf,
refWidth,
pRefRect,
pSrcCurrBuf,
pSearchPointRefPos,
rndVal,
pSrcDstMV,
pDstSAD,
BlockSize));
}
/* End of file */
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