63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
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/* $Header: /cvs/root/winamp/vlb/pulsedata.cpp,v 1.1 2009/04/28 20:21:10 audiodsp Exp $ */
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/***************************************************************************\
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*
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* Copyright 2000-2002 Dolby Laboratories, Inc. All Rights
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* Reserved. Do not copy. Do not distribute.
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* Confidential information.
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*
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* (C) copyright Fraunhofer - IIS (1998)
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* All Rights Reserved
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*
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* filename: pulsedata.cpp
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* project : MPEG-2 AAC Decoder
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* contents/description: pulse data tool
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*
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\***************************************************************************/
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#include "pulsedata.h"
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#include "bitstream.h"
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#include "channelinfo.h"
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CPulseData::CPulseData ()
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: m_PulseDataPresent (1),
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m_NumberPulse (2),
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m_PulseStartBand (6)
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{
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}
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CPulseData::~CPulseData ()
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{
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}
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void CPulseData::Read (CDolbyBitStream &bs)
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{
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if (m_PulseDataPresent.Read (bs))
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{
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m_NumberPulse.Read (bs) ;
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m_PulseStartBand.Read (bs) ;
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for (int i = 0 ; i <= m_NumberPulse ; i++)
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{
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m_PulseOffset [i].Read (bs, 5) ;
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m_PulseAmp [i].Read (bs, 4) ;
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}
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}
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}
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void CPulseData::Apply (const CChannelInfo &info, int coef [])
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{
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if (m_PulseDataPresent)
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{
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int k = info.GetScaleFactorBandOffsets () [(int) m_PulseStartBand] ;
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for (int i = 0 ; i <= m_NumberPulse ; i++)
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{
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k += m_PulseOffset [i] ;
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if (coef [k] > 0) coef [k] += m_PulseAmp [i] ;
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else coef [k] -= m_PulseAmp [i] ;
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}
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}
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}
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