fl::audio::detector::TempoAnalyzer Class Reference

Detailed Description

Definition at line 15 of file tempo_analyzer.h.

#include <tempo_analyzer.h>

Inheritance diagram for fl::audio::detector::TempoAnalyzer:

Collaboration diagram for fl::audio::detector::TempoAnalyzer:

Classes
struct	TempoHypothesis

Public Member Functions
	TempoAnalyzer () FL_NO_EXCEPT
	~TempoAnalyzer () FL_NO_EXCEPT override
float	calculateIntervalScore (u32 interval) FL_NO_EXCEPT
void	fireCallbacks () FL_NO_EXCEPT override
float	getBPM () const FL_NO_EXCEPT
float	getConfidence () const FL_NO_EXCEPT
const char *	getName () const FL_NO_EXCEPT override
float	getStability () const FL_NO_EXCEPT
bool	isStable () const FL_NO_EXCEPT
bool	needsFFT () const FL_NO_EXCEPT override
bool	needsFFTHistory () const FL_NO_EXCEPT override
void	reset () FL_NO_EXCEPT override
void	setMaxBPM (float maxBPM) FL_NO_EXCEPT
void	setMinBPM (float minBPM) FL_NO_EXCEPT
void	setStabilityThreshold (float threshold) FL_NO_EXCEPT
void	update (shared_ptr< Context > context) FL_NO_EXCEPT override
Public Member Functions inherited from fl::audio::Detector
virtual	~Detector () FL_NO_EXCEPT=default
virtual void	setSampleRate (int) FL_NO_EXCEPT

Public Attributes
function_list< void(float bpm)>	onTempo
function_list< void(float bpm)>	onTempoChange
function_list< void()>	onTempoStable
function_list< void()>	onTempoUnstable
function_list< void(float bpm, float confidence)>	onTempoWithConfidence

Private Member Functions
float	calculateSpectralFlux (const fft::Bins &fft) FL_NO_EXCEPT
float	calculateTempoConfidence (const TempoHypothesis &hyp) FL_NO_EXCEPT
bool	detectOnset (u32 timestamp) FL_NO_EXCEPT
void	pruneHypotheses () FL_NO_EXCEPT
void	updateAdaptiveThreshold () FL_NO_EXCEPT
void	updateCurrentTempo () FL_NO_EXCEPT
void	updateHypotheses (u32 timestamp) FL_NO_EXCEPT
void	updateStability () FL_NO_EXCEPT

Private Attributes
float	mAdaptiveThreshold
bool	mBpmChanged = false
deque< float >	mBPMHistory
MedianFilter< float, 21 >	mBPMMedian
float	mConfidence
SilenceEnvelope	mConfidenceEnvelope
float	mCurrentBPM
MovingAverage< float, 43 >	mFluxAvg
bool	mHasPrevTimestamp = false
vector< TempoHypothesis >	mHypotheses
bool	mIsStable
float	mMaxBPM
float	mMinBPM
deque< u32 >	mOnsetTimes
float	mPreviousBPM = 120.0f
float	mPreviousFlux
vector< float >	mPreviousMagnitudes
u32	mPrevTimestamp = 0
shared_ptr< const fft::Bins >	mRetainedFFT
float	mStability
float	mStabilityThreshold
u32	mStableFrameCount
bool	mWasStable = false

Static Private Attributes
static constexpr size	BPM_HISTORY_SIZE = 20
static constexpr size	FLUX_HISTORY_SIZE = 43
static constexpr u32	MAX_BEAT_INTERVAL_MS = 2000
static constexpr size	MAX_HYPOTHESES = 5
static constexpr size	MAX_ONSET_HISTORY = 50
static constexpr u32	MIN_BEAT_INTERVAL_MS = 250
static constexpr u32	STABLE_FRAMES_REQUIRED = 10

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

• fl/audio/detector/tempo_analyzer.h
• fl/audio/detector/tempo_analyzer.cpp.hpp