LogScale< T > Class Template Reference

LogScale class. More...

#include <logscale.h>

Public Member Functions
	LogScale (T srcMin, T srcMax, T destMin, T destMax, T inValue=0.5, T outValue=0.1)
	Constructor.
	LogScale ()
	Default Constructor with [0, 0.5, 1] => [0, 0.1, 1].
void	changeScaling (T srcMin, T srcMax, T destMin, T destMax, T inValue, T outValue)
	Applies a new scale setting.
void	scale (T *pIn, T *pOut, int32 nSamples)
	Computes the scale from pIn input buffer to pOut output buffer (pIn and POut could be the same buffer).
T	scale (T input) const
	Computes for one given value the scale.
void	invscale (T *pIn, T *pOut, int32 nSamples)
	Computes the inverse scale from pIn input buffer to pOut output buffer (pIn and POut could be the same buffer).
T	invscale (T input) const
	Computes for one given value the inverse scale.
T	invscaleCheck (T in) const
	Same than invscale with a check of the input.

Protected Member Functions
void	setScaling (T srcMin, T srcMax, T destMin, T destMax, T inValue, T outValue)

Protected Attributes
T	scaleFactor
T	scaleFactorInv
T	srcScale
T	srcScaleInv
T	srcMin
T	expo
T	expoInv
T	destMin

Detailed Description

template<class T>
class Steinberg::Vst::LogScale< T >

LogScale class.

Scales [srcMin srcMax] to [destMin destMax]

Scaling curve is defined by given outValue for given inValue

Example for stretched lower range

LogScale myLogScale (0, 1, 0, 1, 0.5, 0.1);
means: input and output ranges are the same, but myLogScale.scale (0.5) is 0.1 ([0, 0.5, 1] => [0, 0.1, 1])

Example for compressed lower range

LogScale myLogScale (0, 1, 0, 1, 0.5, 0.9);
means: input and output ranges are the same, but myLogScale.scale (0.5) is 0.9 ([0, 0.5, 1] => [0, 0.9, 1])

Example for filter frequency range

LogScale myLogScale (0, 1, 80, 22000, 0.5, 2000);
means: input range is between 0 and 1 and output range is between 80 and 22000 and myLogScale.scale (0.5) is 2000 ([0, 0.5, 1] => [80, 2000, 22000])

Constructor & Destructor Documentation

LogScale	(	T	srcMin,
		T	srcMax,
		T	destMin,
		T	destMax,
		T	inValue = 0.5,
		T	outValue = 0.1
	)

Constructor.

LogScale

(

)

Default Constructor with [0, 0.5, 1] => [0, 0.1, 1].

Member Function Documentation

void changeScaling	(	T	srcMin,
		T	srcMax,
		T	destMin,
		T	destMax,
		T	inValue,
		T	outValue
	)

Applies a new scale setting.

Note that destMin should be different than destMax! The same for srcMin and srcMax.

void scale	(	T *	pIn,
		T *	pOut,
		int32	nSamples
	)

Computes the scale from pIn input buffer to pOut output buffer (pIn and POut could be the same buffer).

T scale

(

T

input

)

const

Computes for one given value the scale.

void invscale	(	T *	pIn,
		T *	pOut,
		int32	nSamples
	)

Computes the inverse scale from pIn input buffer to pOut output buffer (pIn and POut could be the same buffer).

T invscale

(

T

input

)

const

Computes for one given value the inverse scale.

T invscaleCheck

(

T

in

)

const

Same than invscale with a check of the input.

void setScaling ( T  srcMin, T  srcMax, T  destMin, T  destMax, T  inValue, T  outValue  )

protected

Member Data Documentation

T scaleFactor

protected

T scaleFactorInv

protected

T srcScale

protected

T srcScaleInv

protected

T srcMin

protected

T expo

protected

T expoInv

protected

T destMin

protected