Receives audio data, runs FFT analysis and stores the result. More...

#include <SaProcessor.h>

Public Member Functions
	SaProcessor (const SaControls *controls)
virtual	~SaProcessor ()
void	analyze (LocklessRingBuffer< SampleFrame > &ring_buffer)
void	terminate ()
void	setSpectrumActive (bool active)
void	setWaterfallActive (bool active)
void	flipRequest ()
void	reallocateBuffers ()
void	rebuildWindow ()
void	clear ()
void	clearHistory ()
const float *	getSpectrumL () const
const float *	getSpectrumR () const
const uchar *	getHistory () const
unsigned int	inBlockSize () const
unsigned int	binCount () const
	size of output (frequency domain) data block
bool	spectrumNotEmpty ()
	check if result buffers contain any non-zero values
unsigned int	waterfallWidth () const
	binCount value capped at 3840 (for display)
unsigned int	waterfallHeight () const
bool	waterfallNotEmpty () const
float	binToFreq (unsigned int bin_index) const
float	binBandwidth () const
float	freqToXPixel (float frequency, unsigned int width) const
float	xPixelToFreq (float x, unsigned int width) const
float	ampToYPixel (float amplitude, unsigned int height) const
float	yPixelToAmp (float y, unsigned int height) const
unsigned int	getSampleRate () const
float	getNyquistFreq () const
float	getFreqRangeMin (bool linear=false) const
float	getFreqRangeMax () const
float	getAmpRangeMin (bool linear=false) const
float	getAmpRangeMax () const

Public Attributes
QMutex	m_reallocationAccess
QMutex	m_dataAccess

Private Member Functions
QRgb	makePixel (float left, float right) const

Private Attributes
const SaControls *	m_controls
bool	m_terminate
unsigned int	m_zeroPadFactor = 2
	use n-steps bigger FFT for given block size
std::atomic< unsigned int >	m_inBlockSize
	size of input (time domain) data block
unsigned int	m_fftBlockSize
	size of padded block for FFT processing
unsigned int	m_sampleRate
unsigned int	m_framesFilledUp
std::vector< float >	m_bufferL
	time domain samples (left)
std::vector< float >	m_bufferR
	time domain samples (right)
std::vector< float >	m_fftWindow
	precomputed window function coefficients
std::vector< float >	m_filteredBufferL
	time domain samples with window function applied (left)
std::vector< float >	m_filteredBufferR
	time domain samples with window function applied (right)
fftwf_plan	m_fftPlanL
fftwf_plan	m_fftPlanR
fftwf_complex *	m_spectrumL
	frequency domain samples (complex) (left)
fftwf_complex *	m_spectrumR
	frequency domain samples (complex) (right)
std::vector< float >	m_absSpectrumL
	frequency domain samples (absolute) (left)
std::vector< float >	m_absSpectrumR
	frequency domain samples (absolute) (right)
std::vector< float >	m_normSpectrumL
	frequency domain samples (normalized) (left)
std::vector< float >	m_normSpectrumR
	frequency domain samples (normalized) (right)
std::vector< uchar >	m_history_work
	local history buffer for render
std::vector< uchar >	m_history
	public buffer for reading
bool	m_flipRequest
	update public buffer only when requested
std::atomic< unsigned int >	m_waterfallHeight
	number of stored lines in history buffer
const unsigned int	m_waterfallMaxWidth = 3840
bool	m_spectrumActive
bool	m_waterfallActive
std::atomic< unsigned int >	m_waterfallNotEmpty
	number of lines remaining visible on display
bool	m_reallocating

Detailed Description

Receives audio data, runs FFT analysis and stores the result.

Constructor & Destructor Documentation

◆ SaProcessor()

lmms::SaProcessor::SaProcessor ( const SaControls * controls )

explicit

◆ ~SaProcessor()

lmms::SaProcessor::~SaProcessor ( )

virtual

Member Function Documentation

◆ ampToYPixel()

float lmms::SaProcessor::ampToYPixel	(	float	amplitude,
		unsigned int	height ) const

◆ analyze()

void lmms::SaProcessor::analyze ( LocklessRingBuffer< SampleFrame > & ring_buffer )

◆ binBandwidth()

float lmms::SaProcessor::binBandwidth ( ) const

◆ binCount()

unsigned int lmms::SaProcessor::binCount ( ) const

size of output (frequency domain) data block

◆ binToFreq()

float lmms::SaProcessor::binToFreq ( unsigned int bin_index ) const

◆ clear()

void lmms::SaProcessor::clear ( )

◆ clearHistory()

void lmms::SaProcessor::clearHistory ( )

◆ flipRequest()

void lmms::SaProcessor::flipRequest ( )

inline

◆ freqToXPixel()

float lmms::SaProcessor::freqToXPixel	(	float	frequency,
		unsigned int	width ) const

◆ getAmpRangeMax()

float lmms::SaProcessor::getAmpRangeMax ( ) const

◆ getAmpRangeMin()

float lmms::SaProcessor::getAmpRangeMin ( bool linear = false ) const

◆ getFreqRangeMax()

float lmms::SaProcessor::getFreqRangeMax ( ) const

◆ getFreqRangeMin()

float lmms::SaProcessor::getFreqRangeMin ( bool linear = false ) const

◆ getHistory()

const uchar * lmms::SaProcessor::getHistory ( ) const

inline

◆ getNyquistFreq()

float lmms::SaProcessor::getNyquistFreq ( ) const

◆ getSampleRate()

unsigned int lmms::SaProcessor::getSampleRate ( ) const

◆ getSpectrumL()

const float * lmms::SaProcessor::getSpectrumL ( ) const

inline

◆ getSpectrumR()

const float * lmms::SaProcessor::getSpectrumR ( ) const

inline

◆ inBlockSize()

unsigned int lmms::SaProcessor::inBlockSize ( ) const

inline

◆ makePixel()

QRgb lmms::SaProcessor::makePixel	(	float	left,
		float	right ) const

private

◆ reallocateBuffers()

void lmms::SaProcessor::reallocateBuffers ( )

◆ rebuildWindow()

void lmms::SaProcessor::rebuildWindow ( )

◆ setSpectrumActive()

void lmms::SaProcessor::setSpectrumActive ( bool active )

◆ setWaterfallActive()

void lmms::SaProcessor::setWaterfallActive ( bool active )

◆ spectrumNotEmpty()

bool lmms::SaProcessor::spectrumNotEmpty ( )

check if result buffers contain any non-zero values

◆ terminate()

void lmms::SaProcessor::terminate ( )

inline

◆ waterfallHeight()

unsigned int lmms::SaProcessor::waterfallHeight ( ) const

inline

◆ waterfallNotEmpty()

bool lmms::SaProcessor::waterfallNotEmpty ( ) const

inline

◆ waterfallWidth()

unsigned int lmms::SaProcessor::waterfallWidth ( ) const

binCount value capped at 3840 (for display)

◆ xPixelToFreq()

float lmms::SaProcessor::xPixelToFreq	(	float	x,
		unsigned int	width ) const

◆ yPixelToAmp()

float lmms::SaProcessor::yPixelToAmp	(	float	y,
		unsigned int	height ) const

Member Data Documentation

◆ m_absSpectrumL

std::vector<float> lmms::SaProcessor::m_absSpectrumL

private

frequency domain samples (absolute) (left)

◆ m_absSpectrumR

std::vector<float> lmms::SaProcessor::m_absSpectrumR

private

frequency domain samples (absolute) (right)

◆ m_bufferL

std::vector<float> lmms::SaProcessor::m_bufferL

private

time domain samples (left)

◆ m_bufferR

std::vector<float> lmms::SaProcessor::m_bufferR

private

time domain samples (right)

◆ m_controls

const SaControls* lmms::SaProcessor::m_controls

private

◆ m_dataAccess

QMutex lmms::SaProcessor::m_dataAccess

◆ m_fftBlockSize

unsigned int lmms::SaProcessor::m_fftBlockSize

private

size of padded block for FFT processing

◆ m_fftPlanL

fftwf_plan lmms::SaProcessor::m_fftPlanL

private

◆ m_fftPlanR

fftwf_plan lmms::SaProcessor::m_fftPlanR

private

◆ m_fftWindow

std::vector<float> lmms::SaProcessor::m_fftWindow

private

precomputed window function coefficients

◆ m_filteredBufferL

std::vector<float> lmms::SaProcessor::m_filteredBufferL

private

time domain samples with window function applied (left)

◆ m_filteredBufferR

std::vector<float> lmms::SaProcessor::m_filteredBufferR

private

time domain samples with window function applied (right)

◆ m_flipRequest

bool lmms::SaProcessor::m_flipRequest

private

update public buffer only when requested

◆ m_framesFilledUp

unsigned int lmms::SaProcessor::m_framesFilledUp

private

◆ m_history

std::vector<uchar> lmms::SaProcessor::m_history

private

public buffer for reading

◆ m_history_work

std::vector<uchar> lmms::SaProcessor::m_history_work

private

local history buffer for render

◆ m_inBlockSize

std::atomic<unsigned int> lmms::SaProcessor::m_inBlockSize

private

size of input (time domain) data block

◆ m_normSpectrumL

std::vector<float> lmms::SaProcessor::m_normSpectrumL

private

frequency domain samples (normalized) (left)

◆ m_normSpectrumR

std::vector<float> lmms::SaProcessor::m_normSpectrumR

private

frequency domain samples (normalized) (right)

◆ m_reallocating

bool lmms::SaProcessor::m_reallocating

private

◆ m_reallocationAccess

QMutex lmms::SaProcessor::m_reallocationAccess

◆ m_sampleRate

unsigned int lmms::SaProcessor::m_sampleRate

private

◆ m_spectrumActive

bool lmms::SaProcessor::m_spectrumActive

private

◆ m_spectrumL

fftwf_complex* lmms::SaProcessor::m_spectrumL

private

frequency domain samples (complex) (left)

◆ m_spectrumR

fftwf_complex* lmms::SaProcessor::m_spectrumR

private

frequency domain samples (complex) (right)

◆ m_terminate

bool lmms::SaProcessor::m_terminate

private

◆ m_waterfallActive

bool lmms::SaProcessor::m_waterfallActive

private

◆ m_waterfallHeight

std::atomic<unsigned int> lmms::SaProcessor::m_waterfallHeight

private

number of stored lines in history buffer

◆ m_waterfallMaxWidth

const unsigned int lmms::SaProcessor::m_waterfallMaxWidth = 3840

private

◆ m_waterfallNotEmpty

std::atomic<unsigned int> lmms::SaProcessor::m_waterfallNotEmpty

private

number of lines remaining visible on display

◆ m_zeroPadFactor

unsigned int lmms::SaProcessor::m_zeroPadFactor = 2

private

use n-steps bigger FFT for given block size

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

plugins/SpectrumAnalyzer/SaProcessor.h
plugins/SpectrumAnalyzer/SaProcessor.cpp

Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ SaProcessor()

◆ ~SaProcessor()

Member Function Documentation

◆ ampToYPixel()

◆ analyze()

◆ binBandwidth()

◆ binCount()

◆ binToFreq()

◆ clear()

◆ clearHistory()

◆ flipRequest()

◆ freqToXPixel()

◆ getAmpRangeMax()

◆ getAmpRangeMin()

◆ getFreqRangeMax()

◆ getFreqRangeMin()

◆ getHistory()

◆ getNyquistFreq()

◆ getSampleRate()

◆ getSpectrumL()

◆ getSpectrumR()

◆ inBlockSize()

◆ makePixel()

◆ reallocateBuffers()

◆ rebuildWindow()

◆ setSpectrumActive()

◆ setWaterfallActive()

◆ spectrumNotEmpty()

◆ terminate()

◆ waterfallHeight()

◆ waterfallNotEmpty()

◆ waterfallWidth()

◆ xPixelToFreq()

◆ yPixelToAmp()

Member Data Documentation

◆ m_absSpectrumL

◆ m_absSpectrumR

◆ m_bufferL

◆ m_bufferR

◆ m_controls

◆ m_dataAccess

◆ m_fftBlockSize

◆ m_fftPlanL

◆ m_fftPlanR

◆ m_fftWindow

◆ m_filteredBufferL

◆ m_filteredBufferR

◆ m_flipRequest

◆ m_framesFilledUp

◆ m_history

◆ m_history_work

◆ m_inBlockSize

◆ m_normSpectrumL

◆ m_normSpectrumR

◆ m_reallocating

◆ m_reallocationAccess

◆ m_sampleRate

◆ m_spectrumActive

◆ m_spectrumL

◆ m_spectrumR

◆ m_terminate

◆ m_waterfallActive

◆ m_waterfallHeight

◆ m_waterfallMaxWidth

◆ m_waterfallNotEmpty

◆ m_zeroPadFactor