Audacity Forum

Code: Select all

void EffectNormalize::AnalyzeData(float *buffer, sampleCount len)
{
   int i;

   for(i=0; i<len; i++) {
      if (buffer[i] < mMin)
         mMin = buffer[i];
      if (buffer[i] > mMax)
         mMax = buffer[i];
      mSum += (double)buffer[i];
   }

   mCount += len;
}

void EffectNormalize::StartProcessing()
{
   mMult = 1.0;
   mOffset = 0.0;
   
   float ratio = pow(10.0,TrapDouble(-mLevel,
                                     NORMALIZE_DB_MIN,
                                     NORMALIZE_DB_MAX)/20.0);

   if (mDC) {
      mOffset = (float)(-mSum / mCount);
   }

   if (mGain) {
      float extent = fabs(mMax + mOffset);
      if (fabs(mMin + mOffset) > extent)
         extent = fabs(mMin + mOffset);

      if (extent > 0)
         mMult = ratio / extent;
   }
}

void EffectNormalize::ProcessData(float *buffer, sampleCount len)
{
   int i;

   for(i=0; i<len; i++) {
      float adjFrame = (buffer[i] + mOffset) * mMult;
      buffer[i] = adjFrame;
      gFrameSum += fabs(adjFrame);  //lda: validation.
   }
}