Polymorphic base for all matchers. More...

#include <hart_matcher.hpp>

Inheritance diagram for MatcherBase< SampleType >:

Public Member Functions
virtual	~MatcherBase ()=default

virtual void	prepare (double sampleRateHz, size_t numChannels, size_t maxBlockSizeFrames)=0
	Prepare for processing It is guaranteed that all subsequent process() calls will be in line with the arguments received in this callback. This callback is guaranteed to be called after canOperatePerBlock() If any of the values supplied by this callback are not supported by the matcher, it is expected to act as if the match has failed when match() gets called.

virtual bool	match (const AudioBuffer< SampleType > &observedAudio)=0
	Tells the host if the piece of audio satisfies Matcher's condition or not.

virtual bool	canOperatePerBlock ()=0
	Tells the host if it can operate on a block-by-block basis.

virtual void	reset ()=0
	Resets the matcher to its initial state.

virtual MatcherFailureDetails	getFailureDetails () const =0
	Returns a description of why the match has failed.

virtual void	represent (std::ostream &stream) const =0
	Makes a text representation of this Matcher for test failure outputs.

virtual std::unique_ptr< MatcherBase< SampleType > >	copy () const =0
	Returns a smart pointer with a copy of this object.

virtual std::unique_ptr< MatcherBase< SampleType > >	move ()=0
	Returns a smart pointer with a moved instance of this object.

virtual void	representWithActiveChannels (std::ostream &stream) const =0
	Makes a text representation of this Matcher with optional "atChannels" appendix.

Detailed Description

template<typename SampleType>
class hart::MatcherBase< SampleType >

Polymorphic base for all matchers.

Warning: This class exists only for type erasure and polymorphism. Do NOT inherit custom matchers from this class directly. Inherit from hart::Matcher instead.

Definition at line 24 of file hart_matcher.hpp.

Constructor & Destructor Documentation

◆ ~MatcherBase()

template<typename SampleType >

virtual ~MatcherBase ( )

virtualdefault

Member Function Documentation

◆ prepare()

template<typename SampleType >

virtual void prepare	(	double	sampleRateHz,
		size_t	numChannels,
		size_t	maxBlockSizeFrames
	)

pure virtual

Prepare for processing It is guaranteed that all subsequent process() calls will be in line with the arguments received in this callback. This callback is guaranteed to be called after canOperatePerBlock() If any of the values supplied by this callback are not supported by the matcher, it is expected to act as if the match has failed when match() gets called.

Parameters

sampleRateHz	sample rate at which the audio should be interpreted
numChannels	Number of audio channels
maxBlockSizeFrames	Maximum block size in frames (samples)

Implemented in EqualsTo< SampleType >, FundamentalEquals< SampleType >, PeaksAt< SampleType >, and PeaksBelow< SampleType >.

◆ match()

template<typename SampleType >

virtual bool match ( const AudioBuffer< SampleType > & observedAudio )

pure virtual

Tells the host if the piece of audio satisfies Matcher's condition or not.

It is guaranteed to be called only after prepare(), or not be called at all. It is guaranteed to be handed an AudioBuffer in line with values set by the last prepare() call. If canOperatePerBlock() has returned false, this callback is guaranteed to be handed a full piece of audio to check. Otherwise, it may still get a full piece of audio, or get data on a block-by-block basis.

Parameters

observedAudio A piece of audio to check

Returns: true if the audio satisfies the Matcher's condition, false otherwise

Implemented in EqualsTo< SampleType >, FundamentalEquals< SampleType >, PeaksAt< SampleType >, and PeaksBelow< SampleType >.

◆ canOperatePerBlock()

template<typename SampleType >

virtual bool canOperatePerBlock ( )

pure virtual

Tells the host if it can operate on a block-by-block basis.

Some types of conditions absolutely require having a full piece of audio to produce an appropriate response. For example, hart::PeaksAt matcher. Those types of matchers will return false on this callback. Matcher is guaranteed to receive a full piece of audio if this callback has returned false. Otherwise, it may receive audio either block-by-block basis, or still get a full piece of audio, if the host decides to do so.

Implemented in EqualsTo< SampleType >, FundamentalEquals< SampleType >, PeaksAt< SampleType >, and PeaksBelow< SampleType >.

◆ reset()

template<typename SampleType >

virtual void reset ( )

pure virtual

Resets the matcher to its initial state.

Implemented in EqualsTo< SampleType >, FundamentalEquals< SampleType >, PeaksAt< SampleType >, and PeaksBelow< SampleType >.

◆ getFailureDetails()

template<typename SampleType >

virtual MatcherFailureDetails getFailureDetails ( ) const

pure virtual

Returns a description of why the match has failed.

It is guaranteed to be called strictly after calling match(), or not called at all

Note: This method is a callback for the test host, so you probably don't need to call it yourself ever. If you're making a custom matcher, use it to communicate the data with test host.

Return values

MatcherFailureDetails::frame	Index of frame at which the match has failed
MatcherFailureDetails::channel	Index of channel at which the failure was detected
MatcherFailureDetails::description	Readable description of why the match has failed. Do not include the value of observed frame value or its timing in the description, as well as any of values printed by represent(), as all of this will be added to the output anyway. Also, query hart::CLIConfig for number of displayed decimal places, whenever applicable.

See also: MatcherFailureDetails

Implemented in EqualsTo< SampleType >, FundamentalEquals< SampleType >, PeaksAt< SampleType >, and PeaksBelow< SampleType >.

◆ represent()

template<typename SampleType >

virtual void represent ( std::ostream & stream ) const

pure virtual

Makes a text representation of this Matcher for test failure outputs.

It is strongly encouraged to follow python's repr() conventions for returned text - basically, put something like "MyClass(value1, value2)" (with no quotes) into the stream whenever possible, or "<Readable info in angled brackets>" otherwise. Also, use built-in stream manipulators like hart::dbPrecision wherever applicable. Use HART_DEFINE_GENERIC_REPRESENT() to get a basic implementation for this method.

Parameters

[out] stream Output stream to write to

Implemented in FundamentalEquals< SampleType >, EqualsTo< SampleType >, PeaksAt< SampleType >, and PeaksBelow< SampleType >.