Converts regular stereo signal into mid-side signal. More...

#include <hart_stereo_to_mid_side.hpp>

Inheritance diagram for StereoToMidSide< SampleType >:

Public Member Functions
void	prepare (double, size_t numInputChannels, size_t, size_t) override
	Prepare for processing.

void	process (const AudioBuffer< SampleType > &input, AudioBuffer< SampleType > &output, const EnvelopeBuffers &, ChannelFlags) override
	Processes the audio.

virtual bool	supportsChannelLayout (size_t numInputChannels, size_t numOutputChannels) const override
	Tells the runner (host) whether this effect supports a specific i/o configuration.

void	setValue (int, double) override
	Sets DSP value.

void	reset () override
	Resets to initial state.

Public Member Functions inherited from DSP< SampleType, StereoToMidSide< SampleType > >
StereoToMidSide< SampleType > &	withEnvelope (int paramId, Envelope &&envelope) &
	Adds envelope to a specific parameter by moving it.

StereoToMidSide< SampleType > &&	withEnvelope (int paramId, Envelope &&envelope) &&
	Adds envelope to a specific parameter by moving it.

StereoToMidSide< SampleType > &	withEnvelope (int paramId, const Envelope &envelope) &
	Adds envelope to a specific parameter by copying it.

StereoToMidSide< SampleType > &&	withEnvelope (int paramId, const Envelope &envelope) &&
	Adds envelope to a specific parameter by copying it.

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

StereoToMidSide< SampleType > &	atChannels (std::initializer_list< size_t > channelsToProcess) &
	Makes this DSP process only specific channels, and ignore the rest.

StereoToMidSide< SampleType > &&	atChannels (std::initializer_list< size_t > channelsToProcess) &&
	Makes this DSP process only specific channels, and ignore the rest.

StereoToMidSide< SampleType > &	atChannel (size_t channelToProcess) &
	Makes this DSP process only specific channels, and bypass the rest.

StereoToMidSide< SampleType > &&	atChannel (size_t channelToProcess) &&
	Makes this DSP process only specific channels, and bypass the rest.

StereoToMidSide< SampleType > &	atAllChannels () &
	Makes this DSP apply to all channels.

StereoToMidSide< SampleType > &&	atAllChannels () &&
	Makes this DSP apply to all channels.

StereoToMidSide< SampleType > &	atAllChannelsExcept (std::initializer_list< size_t > channelsToSkip) &
	Makes this DSP process only specific channels, and bypass the rest.

StereoToMidSide< SampleType > &&	atAllChannelsExcept (std::initializer_list< size_t > channelsToSkip) &&
	Makes this DSP process only specific channels, and bypass the rest.

Public Member Functions inherited from DSPBase< SampleType >
virtual double	getValue (int) const
	Retrieves DSP value.

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

virtual bool	supportsEnvelopeFor (int) const
	Tells whether this effect accepts automation envelopes for a particular parameter.

virtual bool	supportsSampleRate (double) const
	Tells whether this effect supports given sample rate.

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

virtual	~DSPBase ()=default
	Destructor.

	DSPBase ()=default
	Default constructor.

	DSPBase (const DSPBase &other)
	Copies from another DSP effect instance.

	DSPBase (DSPBase &&other) noexcept
	Move constructor.

DSPBase &	operator= (const DSPBase &other)
	Copies from another DSP effect instance.

DSPBase &	operator= (DSPBase &&other) noexcept
	Move assignment.

bool	hasEnvelopeFor (int paramId)
	Checks if there's an automation envelope attached to a specific parameter.

void	prepareWithEnvelopes (double sampleRateHz, size_t numInputChannels, size_t numOutputChannels, size_t maxBlockSizeFrames)
	Prepares all the attached envelopes and the effect itself for processing.

void	resetWithEnvelopes ()
	Resets the DSP instance, and all associated Envelopes.

ChannelFlags	getChannelsToProcess ()
	Returns a structure indicating which channels should be processed by this DSP.

void	processWithEnvelopes (const AudioBuffer< SampleType > &input, AudioBuffer< SampleType > &output)
	Renders all the automation envelopes and processes the audio.

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

Additional Inherited Members
Protected Attributes inherited from DSPBase< SampleType >
std::unordered_map< int, std::unique_ptr< Envelope > >	m_envelopes

ChannelFlags	m_channelsToProcess {true}

Related Symbols inherited from DSP< SampleType, StereoToMidSide< SampleType > >
std::ostream &	operator<< (std::ostream &stream, const DSPBase< SampleType > &dsp)
	Prints readable text representation of the DSP object into the I/O stream.

Detailed Description

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

Converts regular stereo signal into mid-side signal.

Mid = L + R, Side = L - R

Note: Obviously, this DSP only supports stereo signals

See also: hart::MidSideChannel

Definition at line 15 of file hart_stereo_to_mid_side.hpp.

Member Function Documentation

◆ prepare()

template<typename SampleType >

void prepare	(	double	sampleRateHz,
		size_t	numInputChannels,
		size_t	numOutputChannels,
		size_t	maxBlockSizeFrames
	)

inlineoverridevirtual

Prepare for processing.

In real-time DSP, such methods are usually used for allocating memory and other non-realtime-safe and heavyweight operations. But keep in mind that that HART does not do real-time processing, so this merely follows common real-time DSP design conventions, where non-realtime operations are done in a separate callback like this one. This method is guaranteed to be called after supportsChannelLayout() and supportsSampleRate(), but before process(). It is guaranteed that the number of input and output channels obeys supportsChannelLayout() and supportsSampleRate() preferences. It is guaranteed that all subsequent process() calls will be in line with the arguments received in this callback.

Parameters

sampleRateHz	sample rate at which the audio should be interpreted and processed
numInputChannels	Number of input channels
numOutputChannels	Number of output channels
maxBlockSizeFrames	Maximum block size in frames (samples)

Implements DSPBase< SampleType >.

Definition at line 19 of file hart_stereo_to_mid_side.hpp.

◆ process()

template<typename SampleType >

void process	(	const AudioBuffer< SampleType > &	input,
		AudioBuffer< SampleType > &	output,
		const EnvelopeBuffers &	envelopeBuffers,
		ChannelFlags	channelsToProcess
	)

inlineoverridevirtual

Processes the audio.

Depending on circumstances, this callback will either be called once to process an entire piece of audio from start to finish, or called repeatedly, one block at a time (see AudioTestBuilder::withBlockSize()). All audio blocks except the last one are guaranteed to be equal to maxBlockSizeFrames set in prepare() callback. It is guaranteed that input and output buffers are equal in length in frames (samples) to each, but they might have different number of channels. Use supportsChannelLayout() to indicate whether the effect supports a specific i/o configuration or not, as it will be called before prepare(). It is guaranteed that envelopeBuffers will only contain the values for all attached envelopes for this instance of DSP effect, and will not contain any data (including key with empty item) if there's no envelope attached to a specific parameter ID in this effects's instance. It will never contain envelopes for IDs that get rejected by supportsEnvelopeFor(). Each vector in the envelopeBuffers map is guaranteed to be at least as large as input (and output) block. For partial blocks, only the first input.getNumFrames() elements contain valid data for the current block; the rest may be stale or uninitialized. DSP implementations are expected to ignore values beyond that index range.

Note: This method may be called in a replacing manner, i. e. input and output may be references to the same object.

Warning: Remember that the very last block of audio is almost always smaller than the block size set in prepare(), so be careful with buffer bounds.

Note: Note that this method does not have to be real-time safe, as all rendering always happens offline. Also note that, unlike real-time audio applications, this method is called on the same thread as all others like prepare().

Parameters

input	Input audio block
output	Output audio block
envelopeBuffers	Envelope values for this block, see EnvelopeBuffers
channelsToProcess	Channels that need processing. Process channels that are marked `true`, bypass ones marked `false`.

Implements DSPBase< SampleType >.

Definition at line 25 of file hart_stereo_to_mid_side.hpp.

◆ supportsChannelLayout()

template<typename SampleType >

virtual bool supportsChannelLayout	(	size_t	numInputChannels,
		size_t	numOutputChannels
	)		const

inlineoverridevirtual

Tells the runner (host) whether this effect supports a specific i/o configuration.

It is guaranteed that the effect will not receive unsupported number of channels in process(). However, it is not always possible to handle gracefully channel layout being unsupported, so in some circumstances it can cause an exception or a test failure. This method is guaranteed to be called at least once before prepare()

Implements DSPBase< SampleType >.

Definition at line 38 of file hart_stereo_to_mid_side.hpp.

◆ setValue()

template<typename SampleType >

void setValue	(	int	paramId,
		double	value
	)

inlineoverridevirtual

Sets DSP value.

Parameters

paramId	Some ID that your subclass understands; use of enums is encouraged for readability
value	Value of the param in an appropriate unit; use of SI units is encouraged (i.e. s instead of ms. Hz instead of kHz) to make better use of unit literals (see Units)

Warning: This method is only called to set a fixed value before processing, and is not called to do automation (via hart::Envelope) If you want your class to support automation for a specific parameter, override supportsEnvelopeFor(), and then use envelopeBuffers provided in process() callback.

Implements DSPBase< SampleType >.

Definition at line 43 of file hart_stereo_to_mid_side.hpp.