/usr/include/CLAM/AudioDescriptors.hxx is in libclam-dev 1.4.0-7.
This file is owned by root:root, with mode 0o644.
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* Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
* UNIVERSITAT POMPEU FABRA
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __AUDIODescriptors_H__
#define __AUDIODescriptors_H__
#include <typeinfo>
#include "Descriptor.hxx"
#include "DataTypes.hxx"
/*
* This class holds Descriptors computed from Audio data
*
*
*/
namespace CLAM {
class Audio;
class AudioDescriptors : public DescriptorAbs {
public:
DYNAMIC_TYPE_USING_INTERFACE (AudioDescriptors, 8, DescriptorAbs);
/** The mean value of the absolute value of the audio samples amplitude.
* The result is in signal units.
* @see Stats::GetMean
*/
DYN_ATTRIBUTE (0, public, TData, Mean);
/** The variance of audio samples amplitude.
* The result is in signal difference squared units.
* @see Stats::GetVariance
*/
DYN_ATTRIBUTE (1, public, TData, Variance);
/**
* The temporal centroid is time where signal energy
* is "concentrated". For a "silence" signal the centroid will be
* placed in the middle of the signal.
* It is computed by computing the statistical centroid over
* the absolute value of the signal.
* Measured in seconds.
* @see Stats::GetCentroid
*/
DYN_ATTRIBUTE (2, public, TData, TemporalCentroid);
/**
* The log-attack time is the (base 10) logarithm of the
* rise time. For a silent signal, log-attack time is
* -5. Measured in log10(seconds).
*/
DYN_ATTRIBUTE (3, public, TData, LogAttackTime);
/**
* The squared sum of audio samples amplitudes.
* This measure is not limited to the range [0,1].
* Measured in squared signal units.
* @see Stats::GetEnergy
*/
DYN_ATTRIBUTE (4, public, TData, Energy);
/**
* The zero-crossing rate is a measure of the number of time
* the signal value cross the zero axe, averaged over the
* whole signal. Measured in crossings/second.
*/
DYN_ATTRIBUTE (5, public, TData, ZeroCrossingRate);
/**
* The rise time is the time duration between the signal
* reached 2% of it maximum value to the time it reaches 80%
* of its maximum value. For a silent signal, rise time is
* 0. Measured in seconds.
*/
DYN_ATTRIBUTE (6, public, TData, RiseTime);
/**
* The temporal decrease is a measure of the amount of
* decrease in the signal energy. Measured in dB per
* seconds??
*/
DYN_ATTRIBUTE (7, public, TData, Decrease);
public:
AudioDescriptors(Audio* pAudio);
AudioDescriptors(TData initVal);
const Audio* GetpAudio() const;
void SetpAudio(Audio* pAudio);
void ConcreteCompute();
private:
void DefaultInit();
void CopyInit(const AudioDescriptors & copied);
TData ComputeZeroCrossingRate();
TData ComputeAttackTime();
TData ComputeLogAttackTime();
TData ComputeDecrease();
private:
const Audio* mpAudio;
static const TData mEpsilon;
bool mIsAttackTimeComputed;
TData mComputedAttackTime;
};
AudioDescriptors operator * (const AudioDescriptors& a,TData mult) ;
AudioDescriptors operator * (TData mult, const AudioDescriptors& a) ;
AudioDescriptors operator * (const AudioDescriptors& a,const AudioDescriptors& b) ;
AudioDescriptors operator + (const AudioDescriptors& a,const AudioDescriptors& b) ;
AudioDescriptors operator - (const AudioDescriptors& a,const AudioDescriptors& b) ;
AudioDescriptors operator / (const AudioDescriptors& a,TData div);
template<>
inline AudioDescriptors CLAM_min (const AudioDescriptors & a,const AudioDescriptors & b)
{
AudioDescriptors tmpD(a);
if (a.HasMean() && b.HasMean() )
{
if(b.GetMean()<a.GetMean())
tmpD.SetMean(b.GetMean() );
}
if (a.HasTemporalCentroid() && b.HasTemporalCentroid() )
{
if(b.GetTemporalCentroid()<a.GetTemporalCentroid())
tmpD.SetTemporalCentroid(b.GetTemporalCentroid() );
}
if (a.HasEnergy() && b.HasEnergy() )
{
if(b.GetEnergy()<a.GetEnergy())
tmpD.SetEnergy(b.GetEnergy() );
}
if(a.HasVariance() && b.HasVariance() )
{
if(b.GetVariance()<a.GetVariance())
tmpD.SetVariance(b.GetVariance() );
}
if(a.HasZeroCrossingRate() && b.HasZeroCrossingRate() )
{
if(b.GetZeroCrossingRate()<a.GetZeroCrossingRate())
tmpD.SetZeroCrossingRate(b.GetZeroCrossingRate() );
}
if(a.HasRiseTime() && b.HasRiseTime() )
{
if(b.GetRiseTime()<a.GetRiseTime())
tmpD.SetRiseTime(b.GetRiseTime() );
}
if(a.HasLogAttackTime() && b.HasLogAttackTime() )
{
if(b.GetLogAttackTime()<a.GetLogAttackTime())
tmpD.SetLogAttackTime(b.GetLogAttackTime() );
}
if(a.HasDecrease() && b.HasDecrease() )
{
if(b.GetDecrease()<a.GetDecrease())
tmpD.SetDecrease(b.GetDecrease() );
}
return tmpD;
}
template<>
inline AudioDescriptors CLAM_max (const AudioDescriptors & a,const AudioDescriptors & b)
{
AudioDescriptors tmpD(a);
if (a.HasMean() && b.HasMean() )
{
if(b.GetMean()>a.GetMean())
tmpD.SetMean(b.GetMean() );
}
if (a.HasTemporalCentroid() && b.HasTemporalCentroid() )
{
if(b.GetTemporalCentroid()>a.GetTemporalCentroid())
tmpD.SetTemporalCentroid(b.GetTemporalCentroid() );
}
if (a.HasEnergy() && b.HasEnergy() )
{
if(b.GetEnergy()>a.GetEnergy())
tmpD.SetEnergy(b.GetEnergy() );
}
if(a.HasVariance() && b.HasVariance() )
{
if(b.GetVariance()>a.GetVariance())
tmpD.SetVariance(b.GetVariance() );
}
if(a.HasZeroCrossingRate() && b.HasZeroCrossingRate() )
{
if(b.GetZeroCrossingRate()>a.GetZeroCrossingRate())
tmpD.SetZeroCrossingRate(b.GetZeroCrossingRate() );
}
if(a.HasRiseTime() && b.HasRiseTime() )
{
if(b.GetRiseTime()>a.GetRiseTime())
tmpD.SetRiseTime(b.GetRiseTime() );
}
if(a.HasLogAttackTime() && b.HasLogAttackTime() )
{
if(b.GetLogAttackTime()>a.GetLogAttackTime())
tmpD.SetLogAttackTime(b.GetLogAttackTime() );
}
if(a.HasDecrease() && b.HasDecrease() )
{
if(b.GetDecrease()>a.GetDecrease())
tmpD.SetDecrease(b.GetDecrease() );
}
return tmpD;
}
};
#endif /* __AUDIODescriptors_H__ */
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