Twitch SDK (Internal): ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType > Class Template Reference

Twitch SDK (Internal)

#include <resampleoperator.h>

Classes
struct	SincFunctionParameters

Public Types
using	SampleType = typename InputSource::SampleType

using	FilterOptions = typename ContextType::FilterOptions

using	OutputToInputRatio = std::ratio< OutputSampleRate, InputSampleRate >

Public Member Functions
	ResampleOperator (ContextType &context)

InputSource &	GetInputSource ()

void	Unbind ()

SampleRange	GetSampleRange () const

SampleType	operator[] (size_t index) const

Static Public Attributes
static constexpr size_t	InputSampleRate = InputSource::SampleRate

static constexpr size_t	SampleRate = OutputSampleRate

static constexpr size_t	TapCount = FilterOptions::TapCount

Private Types
using	ImpulseResponseFunction = SincFunctionGenerator< SincFunctionParameters >

using	WindowFunction = typename FilterOptions::WindowFunction

using	CoefficientFunction = ProductGenerator< ImpulseResponseFunction, WindowFunction >

using	CycledCoefficientFunction = CyclingGenerator< CoefficientFunction, OutputToInputRatio::num >

Private Attributes
InputSource	mInputSource

LookupTable< CycledCoefficientFunction, CoefficientPhaseSubdivisions >	mCoefficients

SampleCache< double, TapCount >	mSampleCache

double	mGainNormalization

Static Private Attributes
static constexpr size_t	CoefficientPhaseSubdivisions = OutputToInputRatio::num * TapCount

Detailed Description

template<typename InputSource, size_t OutputSampleRate, typename ContextType>
class ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >

Converts an audio source to one with a lower sample rate.

Template Parameters

InputSource	Conforms to the AudioSource concept.
OutputSampleRate	The sample rate to convert to.

Operator Type Properties: Operator Type: Unary Data Integrity: Lossy SampleType[in] == SampleType[out] SampleRate[in] != SampleRate[out] StartOffset[in] != StartOffset[out] Length[in] != Length[out]

Member Typedef Documentation

◆ CoefficientFunction

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

using ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::CoefficientFunction = ProductGenerator<ImpulseResponseFunction, WindowFunction>

private

◆ CycledCoefficientFunction

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

using ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::CycledCoefficientFunction = CyclingGenerator<CoefficientFunction, OutputToInputRatio::num>

private

◆ FilterOptions

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

using ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::FilterOptions = typename ContextType::FilterOptions

◆ ImpulseResponseFunction

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

using ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::ImpulseResponseFunction = SincFunctionGenerator<SincFunctionParameters>

private

◆ OutputToInputRatio

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

using ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::OutputToInputRatio = std::ratio<OutputSampleRate, InputSampleRate>

◆ SampleType

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

using ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::SampleType = typename InputSource::SampleType

◆ WindowFunction

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

using ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::WindowFunction = typename FilterOptions::WindowFunction

private

Constructor & Destructor Documentation

◆ ResampleOperator()

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::ResampleOperator ( ContextType & context )

inline

Member Function Documentation

◆ GetInputSource()

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

InputSource& ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::GetInputSource ( )

inline

◆ GetSampleRange()

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

SampleRange ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::GetSampleRange ( ) const

inline

◆ operator[]()

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

SampleType ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::operator[] ( size_t index ) const

inline

◆ Unbind()

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

void ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::Unbind ( )

inline

Member Data Documentation

◆ CoefficientPhaseSubdivisions

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

constexpr size_t ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::CoefficientPhaseSubdivisions = OutputToInputRatio::num * TapCount

staticprivate

◆ InputSampleRate

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

constexpr size_t ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::InputSampleRate = InputSource::SampleRate

static

◆ mCoefficients

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

LookupTable<CycledCoefficientFunction, CoefficientPhaseSubdivisions> ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::mCoefficients

private

◆ mGainNormalization

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

double ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::mGainNormalization

private

◆ mInputSource

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

InputSource ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::mInputSource

private

◆ mSampleCache

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

SampleCache<double, TapCount> ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::mSampleCache

mutableprivate

◆ SampleRate

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

constexpr size_t ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::SampleRate = OutputSampleRate

static

◆ TapCount

template<typename InputSource, size_t OutputSampleRate, typename ContextType>

constexpr size_t ttv::ResampleOperator< InputSource, OutputSampleRate, ContextType >::TapCount = FilterOptions::TapCount

static

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

modules/broadcast/broadcast_common/include/twitchsdk/broadcast/internal/audioconvert/resampleoperator.h