fftconvolver::FFTConvolver Class Reference

Implementation of a partitioned FFT convolution algorithm with uniform block size. More...

#include <FFTConvolver.h>

Public Member Functions
	FFTConvolver ()
virtual	~FFTConvolver ()
bool	init (size_t blockSize, const Sample *ir, size_t irLen)
	Initializes the convolver.
void	process (const Sample *input, Sample *output, size_t len)
	Convolves the the given input samples and immediately outputs the result.
void	reset ()
	Resets the convolver and discards the set impulse response.

Private Member Functions
	FFTConvolver (const FFTConvolver &)
FFTConvolver &	operator= (const FFTConvolver &)

Private Attributes
size_t	_blockSize
size_t	_segSize
size_t	_segCount
size_t	_fftComplexSize
std::vector< SplitComplex * >	_segments
std::vector< SplitComplex * >	_segmentsIR
SampleBuffer	_fftBuffer
audiofft::AudioFFT	_fft
SplitComplex	_preMultiplied
SplitComplex	_conv
SampleBuffer	_overlap
size_t	_current
SampleBuffer	_inputBuffer
size_t	_inputBufferFill

Detailed Description

Implementation of a partitioned FFT convolution algorithm with uniform block size.

Some notes on how to use it:

• After initialization with an impulse response, subsequent data portions of arbitrary length can be convolved. The convolver internally can handle this by using appropriate buffering.
• The convolver works without "latency" (except for the required processing time, of course), i.e. the output always is the convolved input for each processing call.
• The convolver is suitable for real-time processing which means that no "unpredictable" operations like allocations, locking, API calls, etc. are performed during processing (all necessary allocations and preparations take place during initialization).

Constructor & Destructor Documentation

FFTConvolver() [1/2]

fftconvolver::FFTConvolver::FFTConvolver

(

)

~FFTConvolver()

fftconvolver::FFTConvolver::~FFTConvolver ( )

virtual

FFTConvolver() [2/2]

fftconvolver::FFTConvolver::FFTConvolver ( const FFTConvolver & )

private

Member Function Documentation

init()

bool fftconvolver::FFTConvolver::init	(	size_t	blockSize,
		const Sample *	ir,
		size_t	irLen )

Initializes the convolver.

Parameters

blockSize	Block size internally used by the convolver (partition size)
ir	The impulse response
irLen	Length of the impulse response

Returns

true: Success - false: Failed

operator=()

FFTConvolver & fftconvolver::FFTConvolver::operator= ( const FFTConvolver & )

private

process()

void fftconvolver::FFTConvolver::process	(	const Sample *	input,
		Sample *	output,
		size_t	len )

Convolves the the given input samples and immediately outputs the result.

Parameters

input	The input samples
output	The convolution result
len	Number of input/output samples

reset()

void fftconvolver::FFTConvolver::reset

(

)

Resets the convolver and discards the set impulse response.

Member Data Documentation

_blockSize

size_t fftconvolver::FFTConvolver::_blockSize

private

_conv

SplitComplex fftconvolver::FFTConvolver::_conv

private

_current

size_t fftconvolver::FFTConvolver::_current

private

_fft

audiofft::AudioFFT fftconvolver::FFTConvolver::_fft

private

_fftBuffer

SampleBuffer fftconvolver::FFTConvolver::_fftBuffer

private

_fftComplexSize

size_t fftconvolver::FFTConvolver::_fftComplexSize

private

_inputBuffer

SampleBuffer fftconvolver::FFTConvolver::_inputBuffer

private

_inputBufferFill

size_t fftconvolver::FFTConvolver::_inputBufferFill

private

_overlap

SampleBuffer fftconvolver::FFTConvolver::_overlap

private

_preMultiplied

SplitComplex fftconvolver::FFTConvolver::_preMultiplied

private

_segCount

size_t fftconvolver::FFTConvolver::_segCount

private

_segments

std::vector<SplitComplex*> fftconvolver::FFTConvolver::_segments

private

_segmentsIR

std::vector<SplitComplex*> fftconvolver::FFTConvolver::_segmentsIR

private

_segSize

size_t fftconvolver::FFTConvolver::_segSize

private

---

The documentation for this class was generated from the following files:

• krotos_dsp/processors/convolution_reverb/FFTConvolver/FFTConvolver.h
• krotos_dsp/processors/convolution_reverb/FFTConvolver/FFTConvolver.cpp