100 lines
1.8 KiB
C++
100 lines
1.8 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 "../Audacity.h"
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#include <wx/intl.h>
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#include "Fade.h"
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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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// IdentInterface implementation
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wxString EffectFade::GetSymbol()
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{
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return mFadeIn
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? FADEIN_PLUGIN_SYMBOL
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: FADEOUT_PLUGIN_SYMBOL;
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}
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wxString 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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// EffectIdentInterface 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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int EffectFade::GetAudioInCount()
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{
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return 1;
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}
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int 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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sampleCount EffectFade::ProcessBlock(float **inBlock, float **outBlock, sampleCount 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 (sampleCount i = 0; i < blockLen; i++)
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{
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obuf[i] = (ibuf[i] * ((float) mSample++)) / mSampleCnt;
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}
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}
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else
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{
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for (sampleCount i = 0; i < blockLen; i++)
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{
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obuf[i] = (ibuf[i] * ((float) mSampleCnt - 1 - mSample++)) / mSampleCnt;
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}
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}
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return blockLen;
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}
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