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/****************************************************************************
(C) Copyright Fraunhofer IIS (2004)
All Rights Reserved
Please be advised that this software and/or program delivery is
Confidential Information of Fraunhofer and subject to and covered by the
Fraunhofer IIS Software Evaluation Agreement
between Google Inc. and Fraunhofer
effective and in full force since March 1, 2012.
You may use this software and/or program only under the terms and
conditions described in the above mentioned Fraunhofer IIS Software
Evaluation Agreement. Any other and/or further use requires a separate agreement.
This software and/or program is protected by copyright law and international
treaties. Any reproduction or distribution of this software and/or program,
or any portion of it, may result in severe civil and criminal penalties, and
will be prosecuted to the maximum extent possible under law.
$Id$
****************************************************************************/
/*!
\file
\brief RVLC bitstream reading
\author Robert Weidner
*/
#include "rvlcbit.h"
/*---------------------------------------------------------------------------------------------
function: rvlcReadBitFromBitstream
description: This function returns a bit from the bitstream according to read direction.
It is called very often, therefore it makes sense to inline it (runtime).
-----------------------------------------------------------------------------------------------
input: - bitstream
- pPosition
- readDirection
-----------------------------------------------------------------------------------------------
return: - bit from bitstream
-------------------------------------------------------------------------------------------- */
UCHAR rvlcReadBitFromBitstream (HANDLE_FDK_BITSTREAM bs,
USHORT *pPosition,
UCHAR readDirection)
{
UINT bit;
INT readBitOffset = *pPosition-FDKgetBitCnt(bs);
if( readBitOffset ) {
FDKpushBiDirectional(bs, readBitOffset);
}
if (readDirection == FWD) {
bit = FDKreadBits(bs, 1);
*pPosition += 1;
} else {
/* to be replaced with a brother function of FDKreadBits() */
bit = FDKreadBits(bs, 1);
FDKpushBack(bs, 2);
*pPosition -= 1;
}
return (bit);
}
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