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/**
*
* File Name: omxVCM4P2_QuantInvInter_I.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 inter inverse Quantization
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armCOMM.h"
/**
* Function: omxVCM4P2_QuantInvInter_I (6.2.5.3.2)
*
* Description:
* Performs the second inverse quantization mode on an intra/inter coded
* block. Supports bits_per_pixel = 8. The output coefficients are clipped to
* the range [-2048, 2047].
*
* Input Arguments:
*
* pSrcDst - pointer to the input (quantized) intra/inter block; must be
* aligned on a 16-byte boundary.
* QP - quantization parameter (quantizer_scale)
* videoComp - video component type of the current block. Takes one of the
* following flags: OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE (intra
* version only).
* shortVideoHeader - binary flag indicating presence of short_video_header
* (intra version only).
*
* Output Arguments:
*
* pSrcDst - pointer to the output (dequantized) intra/inter block
*
* Return Value:
*
* OMX_Sts_NoErr - no error
* OMX_Sts_BadArgErr - bad arguments; one or more of the following is
* true:
* - pSrcDst is NULL
* - QP <= 0 or QP >=31
* - videoComp is neither OMX_VC_LUMINANCE nor OMX_VC_CHROMINANCE.
*
*/
OMXResult omxVCM4P2_QuantInvInter_I(
OMX_S16 * pSrcDst,
OMX_INT QP
)
{
OMX_INT coeffCount, Sign;
/* Argument error checks */
armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(((QP <= 0) || (QP >= 32)), OMX_Sts_BadArgErr);
/* Second Inverse quantisation method */
for (coeffCount = 0; coeffCount < 64; coeffCount++)
{
/* check sign */
Sign = armSignCheck (pSrcDst[coeffCount]);
/* Quantize the coeff */
if (QP & 0x1)
{
pSrcDst[coeffCount] = (2* armAbs(pSrcDst[coeffCount]) + 1) * QP;
pSrcDst[coeffCount] *= Sign;
}
else
{
pSrcDst[coeffCount] = (2* armAbs(pSrcDst[coeffCount]) + 1)
* QP - 1;
pSrcDst[coeffCount] *= Sign;
}
/* Saturate */
pSrcDst[coeffCount] = armClip (-2048, 2047, pSrcDst[coeffCount]);
}
return OMX_Sts_NoErr;
}
/* End of file */
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