ARDOUR::DSP::FFTSpectrum Class Reference

#include <dsp_filter.h>

Public Member Functions
	FFTSpectrum (uint32_t window_size, double rate)
	~FFTSpectrum ()
void	set_data_hann (float const *const data, const uint32_t n_samples, const uint32_t offset=0)
void	execute ()
float	power_at_bin (const uint32_t bin, const float norm=1.f) const
float	freq_at_bin (const uint32_t bin) const

Private Member Functions
void	init (uint32_t window_size, double rate)
void	reset ()

Private Attributes
float *	hann_window
uint32_t	_fft_window_size
uint32_t	_fft_data_size
double	_fft_freq_per_bin
float *	_fft_data_in
float *	_fft_data_out
float *	_fft_power
fftwf_plan	_fftplan

Static Private Attributes
static Glib::Threads::Mutex	fft_planner_lock

Detailed Description

Definition at line 287 of file dsp_filter.h.

Constructor & Destructor Documentation

FFTSpectrum()

ARDOUR::DSP::FFTSpectrum::FFTSpectrum	(	uint32_t	window_size,
		double	rate
	)

~FFTSpectrum()

ARDOUR::DSP::FFTSpectrum::~FFTSpectrum

(

)

Member Function Documentation

execute()

void ARDOUR::DSP::FFTSpectrum::execute

(

)

process current data in buffer

freq_at_bin()

float ARDOUR::DSP::FFTSpectrum::freq_at_bin ( const uint32_t  bin ) const

inline

Definition at line 311 of file dsp_filter.h.

init()

void ARDOUR::DSP::FFTSpectrum::init ( uint32_t  window_size, double  rate  )

private

power_at_bin()

float ARDOUR::DSP::FFTSpectrum::power_at_bin	(	const uint32_t	bin,
		const float	norm = 1.f
	)		const

query

Parameters

bin	the frequency bin 0 .. window_size / 2
norm	gain factor (set equal to bin for 1/f normalization)

Returns

signal power at given bin (in dBFS)

reset()

void ARDOUR::DSP::FFTSpectrum::reset ( )

private

set_data_hann()

void ARDOUR::DSP::FFTSpectrum::set_data_hann	(	float const *const	data,
		const uint32_t	n_samples,
		const uint32_t	offset = 0
	)

set data to be analyzed and pre-process with hanning window n_samples + offset must not be larger than the configured window_size

Parameters

data	raw audio data
n_samples	number of samples to write to analysis buffer
offset	destination offset

Member Data Documentation

_fft_data_in

float* ARDOUR::DSP::FFTSpectrum::_fft_data_in

private

Definition at line 326 of file dsp_filter.h.

_fft_data_out

float* ARDOUR::DSP::FFTSpectrum::_fft_data_out

private

Definition at line 327 of file dsp_filter.h.

_fft_data_size

uint32_t ARDOUR::DSP::FFTSpectrum::_fft_data_size

private

Definition at line 323 of file dsp_filter.h.

_fft_freq_per_bin

double ARDOUR::DSP::FFTSpectrum::_fft_freq_per_bin

private

Definition at line 324 of file dsp_filter.h.

_fft_power

float* ARDOUR::DSP::FFTSpectrum::_fft_power

private

Definition at line 328 of file dsp_filter.h.

_fft_window_size

uint32_t ARDOUR::DSP::FFTSpectrum::_fft_window_size

private

Definition at line 322 of file dsp_filter.h.

_fftplan

fftwf_plan ARDOUR::DSP::FFTSpectrum::_fftplan

private

Definition at line 330 of file dsp_filter.h.

fft_planner_lock

Glib::Threads::Mutex ARDOUR::DSP::FFTSpectrum::fft_planner_lock

staticprivate

Definition at line 316 of file dsp_filter.h.

hann_window

float* ARDOUR::DSP::FFTSpectrum::hann_window

private

Definition at line 317 of file dsp_filter.h.

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

• dsp_filter.h