SynthLab SDK
SynthLab::SynthLFO Class Reference

LFO module. More...

#include <lfo.h>

Inheritance diagram for SynthLab::SynthLFO:
SynthLab::SynthModule

Public Member Functions

 SynthLFO (std::shared_ptr< MidiInputData > _midiInputData, std::shared_ptr< LFOParameters > _parameters, uint32_t blockSize=64)
 Constructs Wavetable Oscillator module. More...
 
virtual ~SynthLFO ()
 
virtual bool reset (double _sampleRate) override
 Resets object to initialized state. More...
 
virtual bool update () override
 Updates the selected core; sets GLOBAL engine variable unisonDetuneCents that may have changed since last operation. More...
 
virtual bool render (uint32_t samplesToProcess=1) override
 Renders audio from the selected core. More...
 
virtual bool doNoteOn (MIDINoteEvent &noteEvent) override
 Calls the note-on handler for all cores. More...
 
virtual bool doNoteOff (MIDINoteEvent &noteEvent) override
 Calls the note-off handler for all cores. More...
 
std::shared_ptr< LFOParametersgetParameters ()
 
- 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< ModulatorsgetModulationInput ()
 
std::shared_ptr< ModulatorsgetModulationOutput ()
 
std::shared_ptr< AudioBuffergetAudioBuffers ()
 
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 Attributes

std::shared_ptr< LFOParametersparameters = nullptr
 
- Protected Attributes inherited from SynthLab::SynthModule
std::shared_ptr< ModulatorsmodulationInput = std::make_shared<Modulators>()
 
std::shared_ptr< ModulatorsmodulationOutput = std::make_shared<Modulators>()
 
std::shared_ptr< MidiInputDatamidiInputData = nullptr
 
std::shared_ptr< AudioBufferaudioBuffers = nullptr
 
std::unique_ptr< GlideModulatorglideModulator
 
std::shared_ptr< AudioBufferfmBuffer = nullptr
 
std::shared_ptr< ModuleCoremoduleCores [NUM_MODULE_CORES]
 
std::shared_ptr< ModuleCoreselectedCore = 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

LFO module.

  • loads and supports up to NUM_MODULE_CORES (4) cores
  • it is mainly a wrapper/container for the module cores that do the acutal processing/rendering.

The cores are specialized and #include the wavetable .h files used for operation. The cores demonstrate the variations as documented in Designing Software Synthsizers in C++ 2nd Ed. by Will Pirkle.

The cores include (zero-indexed): 0. LFOCore all the classic LFO waveforms, random sample and hold, and exponentials

  1. FMLFOCore LFO using simple FM algorithms to produce interesting LFO waveforms that move more quickly through complex waveshapes
  2. — EMPTY —
  3. — EMPTY —

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: LFOParameters

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

std::shared_ptr<LFOParameters> getParameters()

  • call the getParameters() function
  • set the parameters in the LFOParameters 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)

Reads:

  • Modulation Input values (modulators)

Writes:

  • Modulation Output values

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:

SynthLFO(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.
  • LFOParameters: 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 modulation values into the Modulators output array
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

◆ SynthLFO()

SynthLab::SynthLFO::SynthLFO ( std::shared_ptr< MidiInputData _midiInputData,
std::shared_ptr< LFOParameters _parameters,
uint32_t  blockSize = 64 
)

Constructs Wavetable Oscillator module.

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

  • See class declaration for information on standalone operation
Parameters
_midiInputDatashared MIDI input resource; may be nullptr
_parametersshared GUI and operational parameters; may be nullptr
blockSizethe synth block process size in frames (stereo)
Returns
the newly constructed object

◆ ~SynthLFO()

virtual SynthLab::SynthLFO::~SynthLFO ( )
inlinevirtual

Destructor is empty: all resources are smart pointers

Member Function Documentation

◆ doNoteOff()

bool SynthLab::SynthLFO::doNoteOff ( MIDINoteEvent noteEvent)
overridevirtual

Calls the note-off handler for all cores.

Returns
true if successful, false otherwise

Implements SynthLab::SynthModule.

◆ doNoteOn()

bool SynthLab::SynthLFO::doNoteOn ( MIDINoteEvent noteEvent)
overridevirtual

Calls the note-on handler for all cores.

Returns
true if successful, false otherwise

Implements SynthLab::SynthModule.

◆ getParameters()

std::shared_ptr<LFOParameters> SynthLab::SynthLFO::getParameters ( )
inline

For standalone operation only; not used in SynthLab synth projects

◆ render()

bool SynthLab::SynthLFO::render ( uint32_t  samplesToProcess = 1)
overridevirtual

Renders audio from the selected core.

  • 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.
Parameters
samplesToProcessthe number of samples in this audio block
Returns
true if successful, false otherwise

Implements SynthLab::SynthModule.

◆ reset()

bool SynthLab::SynthLFO::reset ( double  _sampleRate)
overridevirtual

Resets object to initialized state.

SynthModule Overrides

  • call once during initialization
  • call any time sample rate changes (after init)
  • resets all member cores
Parameters
_sampleRatethe current sample rate in Hz
Returns
true if successful, false otherwise

Implements SynthLab::SynthModule.

◆ update()

bool SynthLab::SynthLFO::update ( )
overridevirtual

Updates the selected core; sets GLOBAL engine variable unisonDetuneCents that may have changed since last operation.

Returns
true if successful, false otherwise

Implements SynthLab::SynthModule.

Member Data Documentation

◆ parameters

std::shared_ptr<LFOParameters> SynthLab::SynthLFO::parameters = nullptr
protected

For standalone operation only; not used in SynthLab synth projects


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