Audio Ping-Pong Delay module. More...

#include <audiodelay.h>

Inheritance diagram for SynthLab::AudioDelay:

Public Member Functions
	AudioDelay (std::shared_ptr< MidiInputData > _midiInputData, std::shared_ptr< AudioDelayParameters > _parameters, uint32_t blockSize=64)
	Constructs a stereo audio delay processor. More...

virtual bool	reset (double _sampleRate) override
	Resets object to initialized state. More...

virtual bool	update () override
	Updates the selected core. More...

virtual bool	render (uint32_t samplesToProcess=1) override
	Processes audio through the stereo delay. More...

virtual bool	doNoteOn (MIDINoteEvent &noteEvent) override
	Perform note-on operations for the component. More...

virtual bool	doNoteOff (MIDINoteEvent &noteEvent) override
	Perform note-off operations for the component. More...

std::shared_ptr< AudioDelayParameters >	getParameters ()

Public Member Functions inherited from SynthLab::SynthModule
	SynthModule (std::shared_ptr< MidiInputData > _midiInputData)
	Constructs a SynthModule. More...

virtual	~SynthModule ()
	Removes cores, if any.

virtual bool	initialize (const char *_dllDirectory)

virtual int32_t	getState ()

virtual bool	shutdown ()

virtual bool	startGlideModulation (GlideInfo &glideInfo)
	starts the built-in glide modulator More...

std::shared_ptr< Modulators >	getModulationInput ()

std::shared_ptr< Modulators >	getModulationOutput ()

std::shared_ptr< AudioBuffer >	getAudioBuffers ()

void	setUnisonMode (double _unisonDetuneCents, double _unisonStarPhase)

void	setFMBuffer (std::shared_ptr< AudioBuffer > pmBuffer)

void	clearFMBuffer ()

virtual bool	getModuleStrings (std::vector< std::string > &moduleStrings, std::string ignoreStr="")
	Gets a std::vector of Module Strings. More...

virtual bool	getModuleStrings (uint32_t coreIndex, std::vector< std::string > &moduleStrings, std::string ignoreStr)
	Gets a std::vector of Module Strings from a particular core. More...

virtual bool	getAllModuleStrings (std::vector< std::string > &moduleStrings, std::string ignoreStr)
	Gets a std::vector of all Module Strings concatenated from all cores in succession. More...

virtual bool	getModKnobStrings (std::vector< std::string > &modKnobStrings)
	Gets a std::vector of Mod Knob label strings for the selected core. More...

virtual bool	getModKnobStrings (uint32_t coreIndex, std::vector< std::string > &modKnobStrings)
	Gets a std::vector of Mod Knob label strings for a given core; if the core cannot be found returs the mod knob labels of the module itself. More...

virtual bool	getModuleCoreStrings (std::vector< std::string > &moduleCoreStrings)
	Gets a std::vector of the names of the four cores in this module. More...

virtual bool	addModuleCore (std::shared_ptr< ModuleCore > core)
	adds a module core to the module's set of four More...

virtual uint32_t	getSelectedCoreIndex ()
	get the index of the selected core More...

virtual bool	selectModuleCore (uint32_t index)
	Select a core. More...

virtual bool	selectDefaultModuleCore ()
	Select the default core, which is always the first in the list. More...

virtual void	packCores ()
	packs the cores into non-null ordering

virtual bool	clearModuleCores ()
	Clears out the module core pointer list. More...

virtual void	setStandAloneMode (bool b)
	Sets the stand-alone mode flag on all cores. More...

Protected Member Functions
void	createDelayBuffers (double _sampleRate, double _bufferLength_mSec)
	Create new circular buffers on init, or anytime the sample rate changes. More...

Protected Attributes
std::shared_ptr< AudioDelayParameters >	parameters = nullptr

double	sampleRate = 0.0
	current sample rate

double	samplesPerMSec = 0.0
	samples per millisecond, for easy access calculation

double	delayInSamples_L = 0.0
	double includes fractional part

double	delayInSamples_R = 0.0
	double includes fractional part

double	bufferLength_mSec = 0.0
	buffer length in mSec

unsigned int	bufferLength = 0
	buffer length in samples

double	wetMix = 0.707
	wet output default = -3dB

double	dryMix = 0.707
	dry output default = -3dB

CircularBuffer< double >	delayBuffer_L
	LEFT delay buffer of doubles.

CircularBuffer< double >	delayBuffer_R
	RIGHT delay buffer of doubles.

Protected Attributes inherited from SynthLab::SynthModule
std::shared_ptr< Modulators >	modulationInput = std::make_shared<Modulators>()

std::shared_ptr< Modulators >	modulationOutput = std::make_shared<Modulators>()

std::shared_ptr< MidiInputData >	midiInputData = nullptr

std::shared_ptr< AudioBuffer >	audioBuffers = nullptr

std::unique_ptr< GlideModulator >	glideModulator

std::shared_ptr< AudioBuffer >	fmBuffer = nullptr

std::shared_ptr< ModuleCore >	moduleCores [NUM_MODULE_CORES]

std::shared_ptr< ModuleCore >	selectedCore = nullptr

ModuleCoreData	moduleData
	modulestrings (16) and mod knob labels (4) More...

double	unisonDetuneCents = 0.0

double	unisonStartPhase = 0.0

bool	standAloneMode = false

CoreProcData	coreProcessData

std::string	dllDirectory

Detailed Description

Audio Ping-Pong Delay module.

does not include any ModuleCores; implements functionality directly
implements stereo ping-pong delay with feedback;
can easily add more modes of operation from FX book

Base Class: SynthModule

Overrides the five (5) common functions plus a special getParameters() method to return a shared pointer to the parameters structure.

Databases: None

GUI Parameters: AudioDelayParameters

getParameters() function allows direct access to std::shared_ptr<AudioDelayParameters>

std::shared_ptr<AudioDelayParameters> getParameters()

call the getParameters() function
set the parameters in the AudioDelayParameters structure with new values, typically from a GUI To apply these new parameters either:
(a) call the module's update() function OR
(b) call the render() function which in turn calls the update() method.

Ordinarily, this operation happens just prior to calling the render() function so that is the preferred method of operation to avoid multiple calls to the update() function, which is usually the most CPU intensive function of the SynthModule.

Access to Modulators

std::shared_ptr<Modulators> getModulationInput()
std::shared_ptr<Modulators> getModulationOutput()

Access to audio buffers (I/O)

std::shared_ptr<AudioBuffer> getAudioBuffers()

Reads:

AudioBuffer Input samples

Writes:

AudioBuffer Output samples

Construction:

(1) For use within a synth project, the constructor is specialized to use shared recources for:

The owning object (SynthVoice for the SynthLab projects) must pass these valid pointers to the object at construction time. Typically the engine or voice will be the primary synthesizers of these resources. See the 2nd Edition Synth Book for more information.

(2) Standalone:

To use in standalone mode, call the constructor with the shared resoure pointers as null:

AudioDelay(nullptr, nullptr, 64);

In standalone mode, the object creates and maintains these resources:

MidiInputData: this has no read access so you cannot access its data. Ordinarily, you pass this shared pointer into the object so that it has access to the current MIDI input data. The object does not write data into this resource, so it is functionally non-opeational.
AudioDelayParameters: in standalone mode only, these are synthesized locally on the object, and then the owning object may obtain a shared pointer to them to read/write the parameters directly.

Render:

renders into its own AudioBuffers object; see SynthModule::getAudioBuffers()
processes stereo by default

Author: Will Pirkle http://www.willpirkle.com

Remarks: This object is included and described in further detail in Designing Software Synthesizer Plugins in C++ 2nd Ed. by Will Pirkle

Version: Revision : 1.0

Date: Date : 2021 / 04 / 26

Constructor & Destructor Documentation

◆ AudioDelay()

SynthLab::AudioDelay::AudioDelay	(	std::shared_ptr< MidiInputData >	_midiInputData,
		std::shared_ptr< AudioDelayParameters >	_parameters,
		uint32_t	blockSize = `64`
	)

Constructs a stereo audio delay processor.

One and only specialized constructor; pointers may be null for stanalone

See class declaration for information on standalone operation

Parameters

_midiInputData	shared MIDI input resource; may be nullptr
_parameters	shared GUI and operational parameters; may be nullptr
blockSize	the synth block process size in frames (stereo)

Returns: the newly constructed object

Member Function Documentation

◆ createDelayBuffers()

void SynthLab::AudioDelay::createDelayBuffers	(	double	_sampleRate,
		double	_bufferLength_mSec
	)

protected

Create new circular buffers on init, or anytime the sample rate changes.

creation function

the circular buffer objects will delete existing buffers automatically

Returns: true if handled, false if not handled

◆ doNoteOff()

bool SynthLab::AudioDelay::doNoteOff ( MIDINoteEvent & noteEvent )

overridevirtual

Perform note-off operations for the component.

nothing to do here

Returns: true if handled, false if not handled

Implements SynthLab::SynthModule.

◆ doNoteOn()

bool SynthLab::AudioDelay::doNoteOn ( MIDINoteEvent & noteEvent )

overridevirtual

Perform note-on operations for the component.

nothing to do here

Returns: true if handled, false if not handled

Implements SynthLab::SynthModule.

◆ getParameters()

std::shared_ptr<AudioDelayParameters> SynthLab::AudioDelay::getParameters ( )

inline

For standalone operation only; not used in SynthLab synth projects

◆ render()

bool SynthLab::AudioDelay::render ( uint32_t samplesToProcess = 1 )

overridevirtual

Processes audio through the stereo delay.

Calls the update function first - NOTE: owning object does not need to call update()
samples to process should normally be the block size, but may be a partial block in some cases due to OS/CPU activity.

Returns: true if successful, false otherwise

Implements SynthLab::SynthModule.

◆ reset()

bool SynthLab::AudioDelay::reset ( double _sampleRate )

overridevirtual

Resets object to initialized state.

SynthModule Overrides

call once during initialization
call any time sample rate changes (after init)

Parameters

_sampleRate the current sample rate in Hz

Returns: true if successful, false otherwise

Implements SynthLab::SynthModule.

◆ update()

bool SynthLab::AudioDelay::update ( )

overridevirtual

Updates the selected core.

Recalculates delay in fractional samples for current block

Returns: true if successful, false otherwise

Implements SynthLab::SynthModule.

Member Data Documentation

◆ parameters

std::shared_ptr<AudioDelayParameters> SynthLab::AudioDelay::parameters = nullptr

protected

For standalone operation only; not used in SynthLab synth projects

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

C:/RackAFX Projects/SynthLab_SDK/source/audiodelay.h
C:/RackAFX Projects/SynthLab_SDK/source/audiodelay.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ AudioDelay()

Member Function Documentation

◆ createDelayBuffers()

◆ doNoteOff()

◆ doNoteOn()

◆ getParameters()

◆ render()

◆ reset()

◆ update()

Member Data Documentation

◆ parameters