JPL::VBAP::LUT2D Class Reference

Look-up table containing channel gains for each direction. More...

#include <JPLSpatial/Panning/VBAPLUT2D.h>

Classes
struct	LUTStats

Public Types
template<class T >
using	Array = std::pmr::vector< T >

Public Member Functions
	LUT2D ()=default
JPL_INLINE bool	IsInitialized () const noexcept
JPL_INLINE float	GetLUTValue (uint32 positionInLUT) const
JPL_INLINE float &	operator[] (int i)
JPL_INLINE const float &	operator[] (int i) const
JPL_INLINE size_t	GetLUTSize () const noexcept
	Size of the LUT = LUT Resolution * Number of Channels.
JPL_INLINE size_t	GetLUTResolution () const noexcept
	Resolution of the LUT.
JPL_INLINE int	AngleNormalizedToLUTPosition (float angleNormalised) const
JPL_INLINE int	AngleToLUTPosition (float angleInRadians) const
JPL_INLINE float	LUTPositionToAngle (int pos) const
JPL_INLINE void	GetSpeakerGains (int lutPosition, std::span< float > outGains) const
	Get preprocessed speaker gains at specific LUT posotion.
JPL_INLINE void	GetSpeakerGains (const Vec2 &direction, std::span< float > outGains) const
	Get preprocessed speaker gains from LUT based on direction vector.
JPL_INLINE void	GetSpeakerGains (const simd &dirX, const simd &dirY, std::span< simd > outGains) const
	Get preprocessed speaker gains from LUT based on direction vector.
JPL_INLINE int	CartesianToLUTPosition (float x, float y) const
	Get LUT position from direction vector.
JPL_INLINE simd_mask	CartesianToLUTPosition (const simd &x, const simd &y) const
	Get LUT position from direction vector.

Static Public Member Functions
static void	BuildDiamondToUniformIndexLUT (Array< uint32 > &outCorrectionLUT, uint32 N_uniform, uint32 M_corr=1024)
static void	BuildDiamondToAngleNormLUT (Array< float > &outCorrectionLUT, uint32 M_corr=1024)

Friends
template<auto GetSpeakerAngleFunction>
class	LUTBuilder2D

Detailed Description

Look-up table containing channel gains for each direction.

Member Typedef Documentation

Array

template<class T >

using JPL::VBAP::LUT2D::Array = std::pmr::vector<T>

Constructor & Destructor Documentation

LUT2D()

JPL::VBAP::LUT2D::LUT2D ( )

default

Member Function Documentation

AngleNormalizedToLUTPosition()

JPL_INLINE int JPL::VBAP::LUT2D::AngleNormalizedToLUTPosition

(

float

angleNormalised

)

const

Get LUT position from direction angle, where 0.0 is forward

Parameters

angleNormalized

angle in radians in [0, 2Pi]

AngleToLUTPosition()

JPL_INLINE int JPL::VBAP::LUT2D::AngleToLUTPosition

(

float

angleInRadians

)

const

Get LUT position from direction angle, where 0.0 is forward

Parameters

angleInRadians

in radians in [-Pi, Pi]

BuildDiamondToAngleNormLUT()

void JPL::VBAP::LUT2D::BuildDiamondToAngleNormLUT ( Array< float > &  outCorrectionLUT, uint32  M_corr = 1024  )

inlinestatic

Build p -> normalized angle in [0,1) M_corr: power-of-two size

BuildDiamondToUniformIndexLUT()

void JPL::VBAP::LUT2D::BuildDiamondToUniformIndexLUT ( Array< uint32 > &  outCorrectionLUT, uint32  N_uniform, uint32  M_corr = 1024  )

inlinestatic

Build a table of size M_corr that maps diamond-parameter bins to 'uniform-angle' indices in [0, N_uniform).

CartesianToLUTPosition() [1/2]

JPL_INLINE simd_mask JPL::VBAP::LUT2D::CartesianToLUTPosition	(	const simd &	x,
		const simd &	y
	)		const

Get LUT position from direction vector.

For diamond encoding we need to normalize Vec2(x, y) direction

CartesianToLUTPosition() [2/2]

JPL_INLINE int JPL::VBAP::LUT2D::CartesianToLUTPosition	(	float	x,
		float	y
	)		const

Get LUT position from direction vector.

GetLUTResolution()

JPL_INLINE size_t JPL::VBAP::LUT2D::GetLUTResolution ( ) const

inlinenoexcept

Resolution of the LUT.

GetLUTSize()

JPL_INLINE size_t JPL::VBAP::LUT2D::GetLUTSize ( ) const

inlinenoexcept

Size of the LUT = LUT Resolution * Number of Channels.

GetLUTValue()

JPL_INLINE float JPL::VBAP::LUT2D::GetLUTValue ( uint32  positionInLUT ) const

inline

Get gain value at LUT position. Channel stride should be handled by the caller.

E.g. to get gain value for channel 3, knowing LUT position (e.g. retrieved by calling AngleToLUTPosition), positionInLUT parameter should be: AngleToLUTPosition * NumberOfChannels + 3.

Channel gain values for each angle are laid out continuously in the LUT. So to get all the target channel gains for a specific angle, simply get the beginning of the gain data, e.g.: GetLUTValue(AngleToLUTPosition * NumberOfChannels) ..and copy the contiguous gains from that position (LFE is inlude if present in the channel map, though the gain for LFE is always 0.0).

GetSpeakerGains() [1/3]

JPL_INLINE void JPL::VBAP::LUT2D::GetSpeakerGains	(	const simd &	dirX,
		const simd &	dirY,
		std::span< simd >	outGains
	)		const

Get preprocessed speaker gains from LUT based on direction vector.

GetSpeakerGains() [2/3]

JPL_INLINE void JPL::VBAP::LUT2D::GetSpeakerGains	(	const Vec2 &	direction,
		std::span< float >	outGains
	)		const

Get preprocessed speaker gains from LUT based on direction vector.

GetSpeakerGains() [3/3]

JPL_INLINE void JPL::VBAP::LUT2D::GetSpeakerGains	(	int	lutPosition,
		std::span< float >	outGains
	)		const

Get preprocessed speaker gains at specific LUT posotion.

IsInitialized()

JPL_INLINE bool JPL::VBAP::LUT2D::IsInitialized ( ) const

inlinenoexcept

LUTPositionToAngle()

JPL_INLINE auto JPL::VBAP::LUT2D::LUTPositionToAngle

(

int

pos

)

const

Convert LUT position to angle (within LUT resolution, irrespective of number of channels of the channel map)

operator[]() [1/2]

JPL_INLINE float & JPL::VBAP::LUT2D::operator[] ( int  i )

inline

operator[]() [2/2]

JPL_INLINE const float & JPL::VBAP::LUT2D::operator[] ( int  i ) const

inline

Friends And Related Symbol Documentation

LUTBuilder2D

template<auto GetSpeakerAngleFunction>

friend class LUTBuilder2D

friend

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

• JPLSpatial/Panning/VBAPLUT2D.h