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