fade.cpp

Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Mac OS X、Microsoft Windows、GNU/Linux和其它作業系統

/**********************************************************************

  Audacity: A Digital Audio Editor

  Fade.cpp

  Robert Leidle

**********************************************************************/

#include "Fade.h"
#include "../WaveTrack.h"

#include <wx/generic/textdlgg.h>
#include <math.h>

bool EffectFadeIn::NewTrackSimpleMono()
{
   mLen = (int)((mCurT1 - mCurT0) * mCurRate + 0.5);
   mSample = 0;

   return true;
}

bool EffectFadeIn::ProcessSimpleMono(float *buffer, sampleCount len)
{
   for (sampleCount i = 0; i < len; i++)
      buffer[i] = (float) (buffer[i] * (float) (mSample + i)
                           / (float) (mLen));
   mSample += len;

   return true;
}

bool EffectFadeOut::NewTrackSimpleMono()
{
   mLen = (int)((mCurT1 - mCurT0) * mCurRate + 0.5);
   mSample = 0;

   return true;
}

bool EffectFadeOut::ProcessSimpleMono(float *buffer, sampleCount len)
{
   for (sampleCount i = 0; i < len; i++)
      buffer[i] = (float) (buffer[i]
                           * (float) (mLen - 1 - (mSample + i))
                           / (float) (mLen));
   mSample += len;

   return true;
}

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