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/* ----------------------------------------------------------------
*
*
* File Name: armVCM4P10_UnpackBlock2x2.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* H.264 inverse quantize and transform helper module
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armVC.h"
/*
* Description
* Unpack a 2x2 block of coefficient-residual pair values
*
* Parameters:
* [in] ppSrc Double pointer to residual coefficient-position pair
* buffer output by CALVC decoding
* [out] ppSrc *ppSrc is updated to the start of next non empty block
* [out] pDst Pointer to unpacked 4x4 block
*/
void armVCM4P10_UnpackBlock2x2(
const OMX_U8 **ppSrc,
OMX_S16* pDst
)
{
const OMX_U8 *pSrc = *ppSrc;
int i;
int Flag, Value;
for (i=0; i<4; i++)
{
pDst[i] = 0;
}
do
{
Flag = *pSrc++;
if (Flag & 0x10)
{
/* 16 bit */
Value = *pSrc++;
Value = Value | ((*pSrc++)<<8);
if (Value & 0x8000)
{
Value -= 0x10000;
}
}
else
{
/* 8 bit */
Value = *pSrc++;
if (Value & 0x80)
{
Value -= 0x100;
}
}
i = Flag & 15;
pDst[i] = (OMX_S16)Value;
}
while ((Flag & 0x20)==0);
*ppSrc = pSrc;
}
/* End of file */
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