147 lines
4.5 KiB
C++
147 lines
4.5 KiB
C++
/**********************************************************************
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Audacity - A Digital Audio Editor
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Copyright 1999-2009 Audacity Team
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License: GPL v2 - see LICENSE.txt
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Dan Horgan
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******************************************************************//**
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\file TimeWarper.cpp
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\brief Contains definitions for IdentityTimeWarper, ShiftTimeWarper,
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LinearTimeWarper, LogarithmicTimeWarper, QuadraticTimeWarper,
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Geometric TimeWarper classes
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*//*******************************************************************/
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#include "../Audacity.h"
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#include "TimeWarper.h"
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#include <wx/string.h>
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#include <math.h>
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double IdentityTimeWarper::Warp(double originalTime) const
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{
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return originalTime;
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}
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double ShiftTimeWarper::Warp(double originalTime) const
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{
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return mWarper->Warp(originalTime + mShift);
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}
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double LinearTimeWarper::Warp(double originalTime) const
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{
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return originalTime*mScale + mShift;
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}
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double LinearInputRateTimeWarper::Warp(double originalTime) const
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{
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double rate = mRateWarper.Warp(originalTime);
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return mTStart + mScale*log(rate/mRStart);
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}
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LinearInputRateTimeWarper::LinearInputRateTimeWarper(double tStart, double tEnd,
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double rStart, double rEnd)
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: mRateWarper(tStart, rStart, tEnd, rEnd), mRStart(rStart),
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mTStart(tStart), mScale((tEnd-tStart)/(rEnd-rStart))
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{
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wxASSERT(mRStart != 0.0);
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wxASSERT(tStart < tEnd);
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}
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double LinearOutputRateTimeWarper::Warp(double originalTime) const
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{
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double scaledTime = mTimeWarper.Warp(originalTime);
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return mTStart + mScale*(sqrt(mC1 + scaledTime * mC2) - mRStart);
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}
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LinearOutputRateTimeWarper::LinearOutputRateTimeWarper(double tStart, double tEnd,
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double rStart, double rEnd)
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: mTimeWarper(tStart, 0.0, tEnd, 1.0),
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mRStart(rStart), mTStart(tStart),
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mScale(2.0*(tEnd-tStart)/(rEnd*rEnd-rStart*rStart)),
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mC1(rStart*rStart), mC2(rEnd*rEnd-rStart*rStart)
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{
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wxASSERT(rStart != rEnd);
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wxASSERT(rStart > 0.0);
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wxASSERT(rEnd > 0.0);
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wxASSERT(tStart < tEnd);
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}
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double LinearInputStretchTimeWarper::Warp(double originalTime) const
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{
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double scaledTime = mTimeWarper.Warp(originalTime);
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return mTStart + mC1 * scaledTime * (1.0 + mC2 * scaledTime);
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}
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LinearInputStretchTimeWarper::LinearInputStretchTimeWarper(double tStart, double tEnd,
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double rStart, double rEnd)
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: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
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mC1((tEnd-tStart)/rStart), mC2(0.5*(rStart/rEnd - 1.0))
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{
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wxASSERT(rStart > 0.0);
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wxASSERT(rEnd > 0.0);
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wxASSERT(tStart < tEnd);
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}
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double LinearOutputStretchTimeWarper::Warp(double originalTime) const
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{
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double scaledTime = mTimeWarper.Warp(originalTime);
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return mTStart + mC1 * (pow(mC2, scaledTime) - 1.0);
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}
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LinearOutputStretchTimeWarper::LinearOutputStretchTimeWarper(double tStart, double tEnd,
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double rStart, double rEnd)
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: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
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mC1((tEnd-tStart)/(rStart*log(rStart/rEnd))), mC2(rStart/rEnd)
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{
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wxASSERT(rStart != rEnd);
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wxASSERT(rStart > 0.0);
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wxASSERT(rEnd > 0.0);
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wxASSERT(tStart < tEnd);
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}
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double GeometricInputTimeWarper::Warp(double originalTime) const
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{
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double scaledTime = mTimeWarper.Warp(originalTime);
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return mTStart + mScale*(pow(mRatio,scaledTime) - 1.0);
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}
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GeometricInputTimeWarper::GeometricInputTimeWarper(double tStart, double tEnd,
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double rStart, double rEnd)
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: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
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mScale((tEnd-tStart)/(log(rStart/rEnd)*rStart)), mRatio(rStart/rEnd)
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{
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wxASSERT(rStart != rEnd);
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wxASSERT(rStart > 0.0);
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wxASSERT(rEnd > 0.0);
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wxASSERT(tStart < tEnd);
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}
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double GeometricOutputTimeWarper::Warp(double originalTime) const
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{
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double scaledTime = mTimeWarper.Warp(originalTime);
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return mTStart + mScale*log1p(mC0 * scaledTime);
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}
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GeometricOutputTimeWarper::GeometricOutputTimeWarper(double tStart, double tEnd,
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double rStart, double rEnd)
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: mTimeWarper(tStart, 0.0, tEnd, 1.0), mTStart(tStart),
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mScale((tEnd-tStart)/(rEnd-rStart)), mC0((rEnd-rStart)/rStart)
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{
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wxASSERT(rStart > 0.0);
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wxASSERT(rEnd > 0.0);
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wxASSERT(tStart < tEnd);
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}
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StepTimeWarper::StepTimeWarper(double tStep, double offset)
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: mTStep(tStep), mOffset(offset)
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{ }
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double StepTimeWarper::Warp(double originalTime) const
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{
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return originalTime + ((originalTime > mTStep) ? mOffset : 0.0);
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}
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