Package com.tagtraum.audiokern.math

Class NativeFFT

java.lang.Object

com.tagtraum.audiokern.math.NativeFFT

All Implemented Interfaces:

Transform

public class NativeFFT
extends Object
implements Transform

Native implementation of FFT.

Author:

Hendrik Schreiber

Constructor Summary

Constructors

Constructor	Description
NativeFFT(int numberOfSamples)

Method Summary

Modifier and Type	Method	Description
protected void	finalize()
float[][]	inverseTransform(float[] real, float[] imaginary)
static float[][]	realFFT(long pointer, boolean forward, int numberOfSamples, float[] realIn, float[] imagIn)	Perform real FFT.
float[][]	transform(float[] real)
float[][]	transform(float[] real, float[] imaginary)

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NativeFFT

public NativeFFT(int numberOfSamples)

Method Detail

inverseTransform

public float[][] inverseTransform(float[] real,
                                  float[] imaginary)
                           throws UnsupportedOperationException

Specified by:

inverseTransform in interface Transform

Throws:

UnsupportedOperationException

transform

public float[][] transform(float[] real)
                    throws UnsupportedOperationException

Specified by:

transform in interface Transform

Throws:

UnsupportedOperationException

transform

public float[][] transform(float[] real,
                           float[] imaginary)
                    throws UnsupportedOperationException

Specified by:

transform in interface Transform

Throws:

UnsupportedOperationException

realFFT

public static float[][] realFFT(long pointer,
                                boolean forward,
                                int numberOfSamples,
                                float[] realIn,
                                float[] imagIn)
                         throws IllegalArgumentException

Perform real FFT.

Parameters:

forward - indicates whether this is a forward or inverse DFT

numberOfSamples - number of samples

realIn - input array of floats

imagIn - imaginary input needed for inverse transform

Returns:

real and imaginary part of the FFT's result

Throws:

IllegalArgumentException - if the number of samples is less than 4 or not a power of 2

finalize

protected void finalize()
                 throws Throwable

Overrides:

finalize in class Object

Throws:

Throwable