ParameterConversions.h

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/*
 * Copyright (C) 2013 David McGriffy, all rights reserved
 */

#ifndef __PARAMETERCONVERSIONS_H_INCLUDED
#define __PARAMETERCONVERSIONS_H_INCLUDED

//---------------------------------------
// utility routines

#define _USE_MATH_DEFINES
#include <math.h>

#define deg2level (1.0f / 360.0f)
#define halfDeg2level (1.0f / 180.0f)
#define level2deg (360.0f)

#define parmTrue 1.0f
#define parmFalse 0.0f

#define parmDirOmni  0.0f
#define parmDirCard  0.5f
#define parmDir8     1.0f
#define parmDirHyper 0.7f

#define parmFmtFuMa  0.0f
#define parmFmtACNSN3D 1.0f

float inline db2level(float db)
{
    return  (float)exp(M_LN10 * ((double)db / 20.0));
}

float inline level2db(float level)
{
    return (float)(20.0f * log((double)level) / M_LN10);
}

float inline degree360Convert (float value)
{
     return (360.0f * value);
}

float inline deg3602Parm (float x)
{
    return (x * deg2level);
}

float inline degPM1802Parm (float x)
{
    return (x * deg2level) + 0.5f;
}

float inline degPM902Parm (float x)
{
    return (x * halfDeg2level) + 0.5f;
}

float inline parm2Deg360(float x)
{
    return (x) * level2deg;
}

float inline parm2degPM180 (float value)
{
     return (360.0f * (value - 0.5f));
}

float inline parm2degPM90 (float value)
{
     return (180.0f * (value - 0.5f));
}

float inline parm2Deg180(float x)
{
    return (x - 0.5f) * level2deg / 2;
}

float inline deg1802Parm (float x)
{
    return (x * halfDeg2level) + 0.5f;
}

float inline degreePM90Convert (float value)
{
     return (180.0f * (value - 0.5f));
}

float inline zeroTwoConvert (float value)
{
     return (2.0f * value);
}

float inline parm2halfpi (float x)
{
    return (float)((M_PI * x) - (M_PI_2));
}

float inline halfpi2Parm (float x)
{
    return (float)((x + (M_PI_2)) / M_PI);
}

float inline pi2Parm (float x)
{
    return (float)((x + (M_PI)) / (2 * M_PI));
}

float inline parm2pi (float x)
{
    return (float)((2*M_PI * x) - M_PI);
}

float inline parm22pi (float x)
{
    return (float)(2*M_PI * x);
}

float inline parm2PlusMinus12 (float x)
{
    return (24.0f * x) - 12.0f;
}

float inline PlusMinus122Parm (float x)
{
    x = (x >  12.0f) ?  12.0f : x;
    x = (x < -12.0f) ? -12.0f : x;
    return (x + 12.0f) / 24.0f;
}

float inline channelGain2Parm (float x)
{
    x = (x >  12.0f) ?  12.0f : x;
    x = (x < -140.0f) ? -140.0f : x;
    if (x >= 0)
        return (x + 12.0f) / 24.0f;
    else
        return (x + 140.0f) / 280.0f;
}

float inline parm2ChannelGain(float x)
{
    if (x >= 0.5f)
        return (x - 0.5f) * 24.0f;
    else
        return (x - 0.5f) * 280.0f;
}

/*float inline parm2Minus12 (float x)
{
    return (12.0f * x) - 12.0f;
}*/

float inline parm2Dist (float x)
{
    return  (float)exp(M_LN2 * (double)x) / 4.0f;
}

float  inline dist2Parm(float dist)
{
    dist = (dist > 4.0f) ? 4.0f : dist;
    dist = (dist < 0.25f) ? 0.25f : dist;
    return (float)(log((double)dist * 4.0) / M_LN2);
}

float inline parm2Dir (float x)
{
    return  x * 2.0f;
}

float  inline dir2Parm(float dir)
{
    return dir / 2.0f;
}

bool inline parm2Bool(float x)
{
    return (x > 0.5f);
}

float inline bool2Parm(bool b)
{
    return (b ? 1.0f : 0.0f);
}

#endif