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/**********************************************************************
Audacity - A Digital Audio Editor
Copyright 1999-2009 Audacity Team
License: GPL v2 or later - see LICENSE.txt
Dan Horgan
******************************************************************//**
\file TimeWarper.cpp
\brief Contains definitions for IdentityTimeWarper, ShiftTimeWarper,
LinearTimeWarper, LogarithmicTimeWarper, QuadraticTimeWarper,
Geometric TimeWarper classes
*//*******************************************************************/
#include "TimeWarper.h"
#include <algorithm>
#include <math.h>
#include <wx/debug.h>
TimeWarper::~TimeWarper() = default;
double IdentityTimeWarper::Warp(double originalTime) const
{
return originalTime;
}
double ShiftTimeWarper::Warp(double originalTime) const
{
return mWarper->Warp(originalTime + mShift);
}
double LinearTimeWarper::Warp(double originalTime) const
{
return originalTime*mScale + mShift;
}
double LinearInputRateTimeWarper::Warp(double originalTime) const
{
double rate = mRateWarper.Warp(originalTime);
return mTStart + mScale*log(rate/mRStart);
}
LinearInputRateTimeWarper::LinearInputRateTimeWarper(double tStart, double tEnd,
double rStart, double rEnd)
: mRateWarper(tStart, rStart, tEnd, rEnd), mRStart(rStart),
mTStart(tStart), mScale((tEnd-tStart)/(rEnd-rStart))
{
wxASSERT(mRStart != 0.0);
wxASSERT(tStart < tEnd);
}
double LinearOutputRateTimeWarper::Warp(double originalTime) const
{
double scaledTime = mTimeWarper.Warp(originalTime);
return mTStart + mScale*(sqrt(mC1 + scaledTime * mC2) - mRStart);
}
LinearOutputRateTimeWarper::LinearOutputRateTimeWarper(double tStart, double tEnd,
double rStart, double rEnd)
: mTimeWarper(tStart, 0.0, tEnd, 1.0),
mRStart(rStart), mTStart(tStart),
mScale(2.0*(tEnd-tStart)/(rEnd*rEnd-rStart*rStart)),
mC1(rStart*rStart), mC2(rEnd*rEnd-rStart*rStart)
{
wxASSERT(rStart != rEnd);
wxASSERT(rStart > 0.0);
wxASSERT(rEnd > 0.0);
wxASSERT(tStart < tEnd);
}
double LinearInputStretchTimeWarper::Warp(double originalTime) const
{
double scaledTime = mTimeWarper.Warp(originalTime);
return mTStart + mC1 * scaledTime * (1.0 + mC2 * scaledTime);
}
LinearInputStretchTimeWarper::LinearInputStretchTimeWarper(double tStart, double tEnd,
double rStart, double rEnd)
: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
mC1((tEnd-tStart)/rStart), mC2(0.5*(rStart/rEnd - 1.0))
{
wxASSERT(rStart > 0.0);
wxASSERT(rEnd > 0.0);
wxASSERT(tStart < tEnd);
}
double LinearOutputStretchTimeWarper::Warp(double originalTime) const
{
double scaledTime = mTimeWarper.Warp(originalTime);
return mTStart + mC1 * (pow(mC2, scaledTime) - 1.0);
}
LinearOutputStretchTimeWarper::LinearOutputStretchTimeWarper(double tStart, double tEnd,
double rStart, double rEnd)
: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
mC1((tEnd-tStart)/(rStart*log(rStart/rEnd))), mC2(rStart/rEnd)
{
wxASSERT(rStart != rEnd);
wxASSERT(rStart > 0.0);
wxASSERT(rEnd > 0.0);
wxASSERT(tStart < tEnd);
}
double GeometricInputTimeWarper::Warp(double originalTime) const
{
double scaledTime = mTimeWarper.Warp(originalTime);
return mTStart + mScale*(pow(mRatio,scaledTime) - 1.0);
}
GeometricInputTimeWarper::GeometricInputTimeWarper(double tStart, double tEnd,
double rStart, double rEnd)
: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
mScale((tEnd-tStart)/(log(rStart/rEnd)*rStart)), mRatio(rStart/rEnd)
{
wxASSERT(rStart != rEnd);
wxASSERT(rStart > 0.0);
wxASSERT(rEnd > 0.0);
wxASSERT(tStart < tEnd);
}
double GeometricOutputTimeWarper::Warp(double originalTime) const
{
double scaledTime = mTimeWarper.Warp(originalTime);
return mTStart + mScale*log1p(mC0 * scaledTime);
}
GeometricOutputTimeWarper::GeometricOutputTimeWarper(double tStart, double tEnd,
double rStart, double rEnd)
: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
mScale((tEnd-tStart)/(rEnd-rStart)), mC0((rEnd-rStart)/rStart)
{
wxASSERT(rStart > 0.0);
wxASSERT(rEnd > 0.0);
wxASSERT(tStart < tEnd);
}
PasteTimeWarper::PasteTimeWarper(double oldT1, double newT1)
: mOldT1{ oldT1 }, mNewT1{ newT1 }
{ }
double PasteTimeWarper::Warp(double originalTime) const
{
if (originalTime < mOldT1)
return std::min(originalTime, mNewT1);
else
return originalTime + mNewT1 - mOldT1;
}
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