A multiband equalizer module that provides low, mid, and high frequency shaping. More...

#include <equalizer_module.h>

Inheritance diagram for vital::EqualizerModule:

Public Member Functions
	EqualizerModule ()
	Constructs an EqualizerModule.

virtual	~EqualizerModule ()

void	init () override
	Initializes the EqualizerModule by creating parameter controls and linking them to internal filters.

void	hardReset () override
	Resets the equalizer filters to their initial states, clearing any buffer or filter history.

void	enable (bool enable) override
	Enables or disables the equalizer module.

void	setSampleRate (int sample_rate) override
	Sets the sample rate of the equalizer and propagates it to all internal filters.

void	processWithInput (const poly_float *audio_in, int num_samples) override
	Processes an input audio buffer through the equalizer.

Processor *	clone () const override
	Clones this EqualizerModule, creating a new instance with identical configuration.

const StereoMemory *	getAudioMemory ()
	Retrieves the internal stereo memory used for storing audio samples.

Public Member Functions inherited from vital::SynthModule
	SynthModule (int num_inputs, int num_outputs, bool control_rate=false)
	Constructs a SynthModule with specified I/O and control rate.

virtual	~SynthModule ()
	Destructor.

control_map	getControls ()
	Returns a map of all controls from this module and its submodules.

Output *	getModulationSource (std::string name)
	Retrieves a modulation source output by name.

const StatusOutput *	getStatusOutput (std::string name) const
	Retrieves a StatusOutput by name.

Processor *	getModulationDestination (std::string name, bool poly)
	Retrieves a modulation destination Processor by name and poly mode.

Processor *	getMonoModulationDestination (std::string name)
	Retrieves a mono modulation destination by name.

Processor *	getPolyModulationDestination (std::string name)
	Retrieves a poly modulation destination by name.

ValueSwitch *	getModulationSwitch (std::string name, bool poly)
	Retrieves a modulation switch by name and poly mode.

ValueSwitch *	getMonoModulationSwitch (std::string name)
	Retrieves a mono modulation switch by name.

ValueSwitch *	getPolyModulationSwitch (std::string name)
	Retrieves a poly modulation switch by name.

void	updateAllModulationSwitches ()
	Updates all modulation switches based on whether their destinations have inputs.

output_map &	getModulationSources ()
	Returns a reference to the map of modulation sources.

input_map &	getMonoModulationDestinations ()
	Returns a reference to the map of mono modulation destinations.

input_map &	getPolyModulationDestinations ()
	Returns a reference to the map of poly modulation destinations.

virtual output_map &	getMonoModulations ()
	Returns a reference to the map of mono modulation readouts.

virtual output_map &	getPolyModulations ()
	Returns a reference to the map of poly modulation readouts.

virtual void	correctToTime (double seconds)
	Allows correction of module state to a given time (if needed).

void	enableOwnedProcessors (bool enable)
	Enables or disables all owned processors.

void	addMonoProcessor (Processor *processor, bool own=true)
	Adds a mono processor to this module.

void	addIdleMonoProcessor (Processor *processor)
	Adds a mono processor that is considered idle (not part of main processing chain).

void	addSubmodule (SynthModule *module)
	Adds a submodule to this SynthModule.

Public Member Functions inherited from vital::ProcessorRouter
	ProcessorRouter (int num_inputs=0, int num_outputs=0, bool control_rate=false)
	Constructs a ProcessorRouter with a specified number of inputs and outputs.

	ProcessorRouter (const ProcessorRouter &original)
	Copy constructor. Creates a new ProcessorRouter from an existing one.

virtual	~ProcessorRouter ()
	Destructor.

virtual void	process (int num_samples) override
	Processes audio through all Processors managed by this router.

virtual void	setOversampleAmount (int oversample) override
	Sets the oversampling amount for all Processors in this router.

virtual void	addProcessor (Processor *processor)
	Adds a Processor to be managed by this router.

virtual void	addProcessorRealTime (Processor *processor)
	Adds a Processor to the router in real-time (no memory allocations).

virtual void	addIdleProcessor (Processor *processor)
	Adds a Processor that should remain idle (not processed) in the router.

virtual void	removeProcessor (Processor *processor)
	Removes a Processor from this router.

void	connect (Processor destination, const Output source, int index)
	Connects a source Output to a destination Processor input by index.

void	disconnect (const Processor destination, const Output source)
	Disconnects a source Output from a destination Processor.

bool	isDownstream (const Processor first, const Processor second) const
	Checks if one Processor is downstream from another, i.e., if there's a path from the second to the first.

bool	areOrdered (const Processor first, const Processor second) const
	Checks if the order of two Processors is fixed in the router's processing sequence.

virtual bool	isPolyphonic (const Processor *processor) const
	Determines if a given Processor is polyphonic within this router.

virtual ProcessorRouter *	getMonoRouter ()
	Gets the mono router that corresponds to this ProcessorRouter.

virtual ProcessorRouter *	getPolyRouter ()
	Gets the polyphonic router that corresponds to this ProcessorRouter.

virtual void	resetFeedbacks (poly_mask reset_mask)
	Resets all Feedback nodes within this router using a reset mask.

Public Member Functions inherited from vital::Processor
	Processor (int num_inputs, int num_outputs, bool control_rate=false, int max_oversample=1)
	Constructs a Processor with a given number of inputs/outputs and oversampling.

virtual	~Processor ()
	Virtual destructor.

virtual bool	hasState () const
	Indicates whether this Processor requires per-voice state.

virtual void	reset (poly_mask reset_mask)
	Called to reset the Processor's per-voice state (e.g., on note-on).

bool	initialized ()
	Returns whether this Processor has been initialized.

force_inline bool	enabled () const
	Checks if this Processor is enabled.

force_inline int	getSampleRate () const
	Retrieves the current (effective) sample rate.

force_inline int	getOversampleAmount () const
	Retrieves the current oversampling factor.

force_inline bool	isControlRate () const
	Checks if this Processor is running at control rate (buffer_size == 1).

virtual void	setControlRate (bool control_rate)
	Sets whether this Processor runs at control rate.

force_inline poly_mask	getResetMask (int input_index) const
	Retrieves a mask indicating which voices triggered a note-on event. Compares the input's trigger_value to kVoiceOn.

force_inline void	clearOutputBufferForReset (poly_mask reset_mask, int input_index, int output_index) const
	Clears output samples for voices that are about to be reset, based on the trigger offset.

bool	inputMatchesBufferSize (int input=0)
	Checks whether the buffer size of a particular input matches the size needed by this Processor.

bool	checkInputAndOutputSize (int num_samples)
	Checks if all inputs and outputs have buffers big enough for `num_samples`.

virtual bool	isPolyphonic () const
	Checks if this Processor is polyphonic by querying its ProcessorRouter.

void	plug (const Output *source)
	Connects an external Output to this Processor's first input.

void	plug (const Output *source, unsigned int input_index)
	Connects an external Output to a specified input index.

void	plug (const Processor *source)
	Connects the first output of a Processor to this Processor's first input.

void	plug (const Processor *source, unsigned int input_index)
	Connects the first output of a Processor to a specified input index.

void	plugNext (const Output *source)
	Connects an external Output to the first available (unplugged) input.

void	plugNext (const Processor *source)
	Connects the first output of a Processor to the first available (unplugged) input.

void	useInput (Input *input)
	Uses an existing Input object as this Processor's first input.

void	useInput (Input *input, int index)
	Uses an existing Input object at a specified input index.

void	useOutput (Output *output)
	Uses an existing Output object as this Processor's first output.

void	useOutput (Output *output, int index)
	Uses an existing Output object at a specified output index.

int	connectedInputs ()
	Counts how many inputs are connected to a real source (not null_source_).

virtual void	unplugIndex (unsigned int input_index)
	Removes the connection at a specified input index, if any.

virtual void	unplug (const Output *source)
	Removes a connection to a given Output from all inputs.

virtual void	unplug (const Processor *source)
	Removes connections to all outputs from a given Processor.

virtual void	numInputsChanged ()
	Called when the number of inputs changes (e.g., new connections). Subclasses may override for dynamic behavior.

force_inline void	router (ProcessorRouter *router)
	Sets the ProcessorRouter that owns or manages this Processor.

force_inline ProcessorRouter *	router () const
	Returns the ProcessorRouter that currently owns this Processor.

ProcessorRouter *	getTopLevelRouter () const
	Gets the topmost (root) ProcessorRouter by traversing parent routers.

virtual void	registerInput (Input *input, int index)
	Registers a new input, appending it to the input list.

virtual Output *	registerOutput (Output *output, int index)
	Registers a new Output in the output list at a specified index.

virtual void	registerInput (Input *input)
	Registers a new Input by appending it to the end of the input list.

virtual Output *	registerOutput (Output *output)
	Registers a new Output by appending it to the end of the output list.

force_inline int	numInputs () const
	Returns the total number of Input pointers (owned or otherwise).

force_inline int	numOutputs () const
	Returns the total number of Output pointers (owned or otherwise).

force_inline int	numOwnedInputs () const
	Returns how many Input objects this Processor owns.

force_inline int	numOwnedOutputs () const
	Returns how many Output objects this Processor owns.

force_inline Input *	input (unsigned int index=0) const
	Retrieves the Input pointer at a given index.

force_inline bool	isInputSourcePolyphonic (int index=0)
	Checks if the input source at a given index is polyphonic.

force_inline Input *	ownedInput (unsigned int index=0) const
	Retrieves an owned Input pointer at a given index.

force_inline Output *	output (unsigned int index=0) const
	Retrieves the Output pointer at a given index.

force_inline Output *	ownedOutput (unsigned int index=0) const
	Retrieves an owned Output pointer at a given index.

void	setPluggingStart (int start)
	Sets the position at which `plugNext` starts searching for an open input.

Protected Attributes
Value *	low_mode_
	Determines if the low band uses a shelf or a high-pass filter.

Value *	band_mode_
	Determines if the mid band uses a shelf or a notch filter.

Value *	high_mode_
	Determines if the high band uses a shelf or a low-pass filter.

DigitalSvf *	high_pass_
	High-pass filter for low band mode.

DigitalSvf *	low_shelf_
	Low shelf filter for low band mode.

DigitalSvf *	notch_
	Notch filter for mid band mode.

DigitalSvf *	band_shelf_
	Band shelf filter for mid band mode.

DigitalSvf *	low_pass_
	Low-pass filter for high band mode.

DigitalSvf *	high_shelf_
	High shelf filter for high band mode.

std::shared_ptr< StereoMemory >	audio_memory_
	Memory buffer for storing processed audio samples.

Protected Attributes inherited from vital::SynthModule
std::shared_ptr< ModuleData >	data_
	Shared data storage for this SynthModule.

Protected Attributes inherited from vital::ProcessorRouter
std::shared_ptr< CircularQueue< Processor * > >	global_order_
	Global processing order reference.

std::shared_ptr< CircularQueue< Processor * > >	global_reorder_
	Temporary storage for reorder operations.

CircularQueue< Processor * >	local_order_
	Local ordering of Processors.

std::map< const Processor *, std::pair< int, std::unique_ptr< Processor > > >	processors_
	Map of global to local Processors.

std::map< const Processor *, std::unique_ptr< Processor > >	idle_processors_
	Idle Processors that are not active in the graph.

std::shared_ptr< std::vector< const Feedback * > >	global_feedback_order_
	Global order of Feedback nodes.

std::vector< Feedback * >	local_feedback_order_
	Local copies of Feedback nodes.

std::map< const Processor *, std::pair< int, std::unique_ptr< Feedback > > >	feedback_processors_
	Map of global to local Feedback processors.

std::shared_ptr< int >	global_changes_
	Global change counter.

int	local_changes_
	Local change counter to track synchronization with global changes.

std::shared_ptr< CircularQueue< const Processor * > >	dependencies_
	Queue for dependencies calculations.

std::shared_ptr< CircularQueue< const Processor * > >	dependencies_visited_
	Queue of visited processors for dependencies calc.

std::shared_ptr< CircularQueue< const Processor * > >	dependency_inputs_
	Queue of processors to check inputs for dependencies.

Protected Attributes inherited from vital::Processor
std::shared_ptr< ProcessorState >	state_
	Shared state (sample rate, oversample, etc.)

int	plugging_start_
	The index at which `plugNext` starts searching for an unplugged input.

std::vector< std::shared_ptr< Input > >	owned_inputs_
	Inputs owned by this Processor.

std::vector< std::shared_ptr< Output > >	owned_outputs_
	Outputs owned by this Processor.

std::shared_ptr< std::vector< Input * > >	inputs_
	All inputs, owned or external.

std::shared_ptr< std::vector< Output * > >	outputs_
	All outputs, owned or external.

ProcessorRouter *	router_
	The ProcessorRouter that manages this Processor.

Additional Inherited Members
Protected Member Functions inherited from vital::SynthModule
Value *	createBaseControl (std::string name, bool audio_rate=false, bool smooth_value=false)
	Creates a simple control processor for a given parameter name.

Output *	createBaseModControl (std::string name, bool audio_rate=false, bool smooth_value=false, Output *internal_modulation=nullptr)
	Creates a base mod control, which is a control combined with a modulation input.

Output *	createMonoModControl (std::string name, bool audio_rate=false, bool smooth_value=false, Output *internal_modulation=nullptr)
	Creates a monophonic mod control, including applying parameter scaling.

Output *	createPolyModControl (std::string name, bool audio_rate=false, bool smooth_value=false, Output internal_modulation=nullptr, Input reset=nullptr)
	Creates a polyphonic mod control, including applying parameter scaling.

Output *	createTempoSyncSwitch (std::string name, Processor frequency, const Output beats_per_second, bool poly, Input *midi=nullptr)
	Creates a tempo sync switch that toggles between tempo-based frequency and free-running frequency.

void	createStatusOutput (std::string name, Output *source)
	Creates a status output associated with a given Output.

Protected Member Functions inherited from vital::ProcessorRouter
virtual void	addFeedback (Feedback *feedback)
	Adds a Feedback node to handle a feedback loop introduced by a connection.

virtual void	removeFeedback (Feedback *feedback)
	Removes a previously added Feedback node.

void	reorder (Processor *processor)
	Reorders the internal processing sequence to account for a Processor's dependencies.

virtual void	updateAllProcessors ()
	Updates all processors to match the global order. Called when changes occur.

force_inline bool	shouldUpdate ()
	Checks if local changes need to be synchronized with global changes.

virtual void	createAddedProcessors ()
	Creates any processors that were added at the global level but not yet replicated locally.

virtual void	deleteRemovedProcessors ()
	Deletes any processors that were removed at the global level but not yet removed locally.

const Processor *	getContext (const Processor *processor) const
	Gets the processor context within this router for a global Processor reference.

void	getDependencies (const Processor *processor) const
	Populates the internal dependencies structure for a given Processor.

Processor *	getLocalProcessor (const Processor *global_processor)
	Retrieves the local instance of a globally defined Processor.

Protected Member Functions inherited from vital::Processor
Output *	addOutput (int oversample=1)
	Creates and registers a new Output. Handles control rate vs. audio rate.

Input *	addInput ()
	Creates and registers a new Input, initially connected to null_source_.

Static Protected Attributes inherited from vital::Processor
static const Output	null_source_
	A null (dummy) source used for unconnected inputs.

Detailed Description

A multiband equalizer module that provides low, mid, and high frequency shaping.

The EqualizerModule uses multiple DigitalSvf filter instances to implement flexible EQ curves. It allows switching between different filter modes (e.g., low shelf vs. high-pass, band shelf vs. notch, etc.), and can store recent audio samples in a memory buffer for analysis or other uses.

Constructor & Destructor Documentation

◆ EqualizerModule()

vital::EqualizerModule::EqualizerModule ( )

Constructs an EqualizerModule.

◆ ~EqualizerModule()

virtual vital::EqualizerModule::~EqualizerModule ( )

inlinevirtual

Member Function Documentation

◆ clone()

Processor * vital::EqualizerModule::clone ( ) const

inlineoverridevirtual

Clones this EqualizerModule, creating a new instance with identical configuration.

Returns: A pointer to the newly cloned EqualizerModule.

Reimplemented from vital::SynthModule.

◆ enable()

void vital::EqualizerModule::enable ( bool enable )

overridevirtual

Enables or disables the equalizer module.

When enabled, it resets all filters to ensure a clean state. When disabled, the module stops processing audio but retains its current parameter settings.

Parameters

enable True to enable, false to disable.

Enables or disables the EQ module.

On enable, it resets the filters to ensure a clean start. On disable, it stops further processing.

Reimplemented from vital::SynthModule.

◆ getAudioMemory()

const StereoMemory * vital::EqualizerModule::getAudioMemory ( )

inline

Retrieves the internal stereo memory used for storing audio samples.

Returns: A pointer to the StereoMemory object containing recent audio samples.

◆ hardReset()

void vital::EqualizerModule::hardReset ( )

overridevirtual

Resets the equalizer filters to their initial states, clearing any buffer or filter history.

Resets all filters to their initial states, clearing internal buffers.

Reimplemented from vital::Processor.

◆ init()

void vital::EqualizerModule::init ( )

overridevirtual

Initializes the EqualizerModule by creating parameter controls and linking them to internal filters.

Initializes all filter instances and their parameter connections.

The equalizer is composed of three sections (low, mid, high), each can operate in one of two modes based on the respective mode Value. It creates and plugs in various modulation controls for cutoff, resonance, gain, and sets the filter styles (12dB pass, shelving, notch, etc.).

Reimplemented from vital::ProcessorRouter.

◆ processWithInput()

void vital::EqualizerModule::processWithInput	(	const poly_float *	audio_in,
		int	num_samples )

overridevirtual

Processes an input audio buffer through the equalizer.

The module chooses between different filter topologies (low shelf vs. high-pass, etc.) based on the mode parameters and processes the audio in a chain: low section, then band section, then high section. The result is stored in the output buffer and also pushed into internal memory.

Parameters

audio_in	Pointer to the input audio samples.
num_samples	The number of samples to process.

Processes the input audio through the chosen filters for low, mid, and high bands.

The module picks the appropriate filter (e.g., high-pass or low shelf for low band) based on the mode parameters, then processes audio in sequence: low section first, then band section, then high section. The final output samples are stored in both the output buffer and the internal stereo memory.

Reimplemented from vital::Processor.

◆ setSampleRate()

void vital::EqualizerModule::setSampleRate ( int sample_rate )

overridevirtual

Sets the sample rate of the equalizer and propagates it to all internal filters.

Parameters

sample_rate The new sample rate in Hz.

Updates the sample rate for all internal filters so time-dependent parameters remain correct.

Reimplemented from vital::ProcessorRouter.

Member Data Documentation

◆ audio_memory_

std::shared_ptr<StereoMemory> vital::EqualizerModule::audio_memory_

protected

Memory buffer for storing processed audio samples.

◆ band_mode_

Value* vital::EqualizerModule::band_mode_

protected

Determines if the mid band uses a shelf or a notch filter.

◆ band_shelf_

DigitalSvf* vital::EqualizerModule::band_shelf_

protected

Band shelf filter for mid band mode.

◆ high_mode_

Value* vital::EqualizerModule::high_mode_

protected

Determines if the high band uses a shelf or a low-pass filter.

◆ high_pass_

DigitalSvf* vital::EqualizerModule::high_pass_

protected

High-pass filter for low band mode.

◆ high_shelf_

DigitalSvf* vital::EqualizerModule::high_shelf_

protected

High shelf filter for high band mode.

◆ low_mode_

Value* vital::EqualizerModule::low_mode_

protected

Determines if the low band uses a shelf or a high-pass filter.

◆ low_pass_

DigitalSvf* vital::EqualizerModule::low_pass_

protected

Low-pass filter for high band mode.

◆ low_shelf_

DigitalSvf* vital::EqualizerModule::low_shelf_

protected

Low shelf filter for low band mode.

◆ notch_

DigitalSvf* vital::EqualizerModule::notch_

protected

Notch filter for mid band mode.

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

/Users/davidvogel/repos/VitalHelp/src/synthesis/modules/equalizer_module.h
/Users/davidvogel/repos/VitalHelp/src/synthesis/modules/equalizer_module.cpp

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ EqualizerModule()

◆ ~EqualizerModule()

Member Function Documentation

◆ clone()

◆ enable()

◆ getAudioMemory()

◆ hardReset()

◆ init()

◆ processWithInput()

◆ setSampleRate()

Member Data Documentation

◆ audio_memory_

◆ band_mode_

◆ band_shelf_

◆ high_mode_

◆ high_pass_

◆ high_shelf_

◆ low_mode_

◆ low_pass_

◆ low_shelf_

◆ notch_