Base class for backends that compute and process FFT from I/Q signal. More...

#include <FFTBackend.h>

Public Member Functions
	FFTBackend (int bins, int overlap)

int	getBins () const
	Returns number of the FFT bins.

float	getFFTSampleRate () const
	Returns number of FFT samples (results) per second (in Hz).

SampleType	getGain ()

void	setGain (SampleType value)

int	getPhaseShift ()

void	setPhaseShift (int value)

virtual void	startStream (StreamInfo info)

virtual void	process (const vector< Complex > &data, DataInfo info)

virtual void	endStream ()

void	resizeRawBuffer (int sampleCount)

float	binToFrequency (int bin) const

float	binToFrequency () const

int	frequencyToBin (float frequency) const

double	fftSamplesToTime (int samples)
	Converts number of FFT samples to seconds. More...

int	timeToFFTSamples (double time)
	Converts time in seconds to number of FFT samples. More...

Public Member Functions inherited from Backend
	Backend ()

StreamInfo	getStreamInfo () const
	Return the stream information passed to the backend through startStream().

Static Public Member Functions
static int16_t	floatToInt (float f)

static void	floatToInt (Complex c, int16_t *result)

static void	floatToInt (Complex c, float *result)

Protected Member Functions
virtual void	processFFT (const fftw_complex *data, int size, DataInfo info, int rawMark)

Protected Attributes
int	bins_

float	fftSampleRate_
	Number of FFT results per second (Hz).

IQBuffer	rawBuffer_
	contains raw I/Q data

Protected Attributes inherited from Backend
StreamInfo	streamInfo_