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114 lines (85 loc) · 2.21 KB
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/**********************************************************************
Audacity: A Digital Audio Editor
Fade.cpp
Robert Leidle
*******************************************************************//**
\class EffectFade
\brief An Effect that reduces the volume to zero over achosen interval.
*//*******************************************************************/
#include "../Audacity.h"
#include "Fade.h"
#include <wx/intl.h>
#include "LoadEffects.h"
const ComponentInterfaceSymbol EffectFadeIn::Symbol
{ XO("Fade In") };
namespace{ BuiltinEffectsModule::Registration< EffectFadeIn > reg; }
const ComponentInterfaceSymbol EffectFadeOut::Symbol
{ XO("Fade Out") };
namespace{ BuiltinEffectsModule::Registration< EffectFadeOut > reg2; }
EffectFade::EffectFade(bool fadeIn)
{
mFadeIn = fadeIn;
}
EffectFade::~EffectFade()
{
}
// ComponentInterface implementation
ComponentInterfaceSymbol EffectFade::GetSymbol()
{
return mFadeIn
? EffectFadeIn::Symbol
: EffectFadeOut::Symbol;
}
TranslatableString EffectFade::GetDescription()
{
return mFadeIn
? XO("Applies a linear fade-in to the selected audio")
: XO("Applies a linear fade-out to the selected audio");
}
// EffectDefinitionInterface implementation
EffectType EffectFade::GetType()
{
return EffectTypeProcess;
}
bool EffectFade::IsInteractive()
{
return false;
}
// EffectClientInterface implementation
unsigned EffectFade::GetAudioInCount()
{
return 1;
}
unsigned EffectFade::GetAudioOutCount()
{
return 1;
}
bool EffectFade::ProcessInitialize(sampleCount WXUNUSED(totalLen), ChannelNames WXUNUSED(chanMap))
{
mSample = 0;
return true;
}
size_t EffectFade::ProcessBlock(float **inBlock, float **outBlock, size_t blockLen)
{
float *ibuf = inBlock[0];
float *obuf = outBlock[0];
if (mFadeIn)
{
for (decltype(blockLen) i = 0; i < blockLen; i++)
{
obuf[i] =
(ibuf[i] * ( mSample++ ).as_float()) /
mSampleCnt.as_float();
}
}
else
{
for (decltype(blockLen) i = 0; i < blockLen; i++)
{
obuf[i] = (ibuf[i] *
( mSampleCnt - 1 - mSample++ ).as_float()) /
mSampleCnt.as_float();
}
}
return blockLen;
}