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