Normalizer.cpp

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// ****************************************************************************
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// ****************************************************************************
// ****************************************************************************
// Filename:  Normalizer.cpp
// Author:    Pedram Azad
// Date:      2005
// ****************************************************************************


// ****************************************************************************
// Includes
// ****************************************************************************

#include <new> // for explicitly using correct new/delete operators on VC DSPs

#include "Normalizer.h"

#include <float.h>



// ****************************************************************************
// Functions
// ****************************************************************************

void Normalizer::NormalizeLength(float *pInput, int nInputLength, float *pOutput, int nOutputLength)
{
        const float factor = float(nInputLength) / nOutputLength;

        int i;
        const int last_i = int((nInputLength - 1) / factor);

        for (i = 0; i <= last_i; i++)
        {
                const int offset = int(i * factor);
                const float w = i * factor - offset;

                pOutput[i] = (1 - w) * pInput[offset] + w * pInput[offset + 1];
        }

        for (i = last_i + 1; i < nOutputLength; i++)
                pOutput[i] = pInput[nInputLength - 1];
}


void Normalizer::NormalizeAmplitude(float *pData, int nLength)
{
        float min = FLT_MAX, max = -FLT_MAX;
        int i;

        if (nLength < 2)
                return;

        for (i = 0; i < nLength; i++)
        {
                if (pData[i] > max)
                        max = pData[i];

                if (pData[i] < min)
                        min = pData[i];
        }

        const float factor = 100.0f / (max - min);

        for (i = 0; i < nLength; i++)
                pData[i] = (pData[i] - min) * factor;
}

void Normalizer::NormalizeStartingPoint(float *pData, int nLength)
{
        if (nLength < 2)
                return;

        const float first = pData[0];

        for (int i = 0; i < nLength; i++)
                pData[i] -= first;
}