flutter_vst3 library

flutter_vst3 - Framework for VST® 3 Plugin Development

This package provides the complete framework for building VST® 3 plugins with Flutter UI and pure Dart audio processing. It bridges Dart/Flutter code with the Steinberg VST® 3 SDK C++ infrastructure.

VST® is a trademark of Steinberg Media Technologies GmbH.

Classes

DartVST3Callbacks

VST3Bridge

Main FFI bridge between Dart VST3 plugins and C++ VST3 infrastructure

VST3ParameterHandler

Base class for parameter management in VST3 plugins

VST3ParameterInfo

VST3 Parameter utilities and types

VST3Processor

Abstract interface that all Dart VST3 processors must implement

Functions

registerVST3Callbacks({required String pluginId}) → void

Register Dart callbacks with C++ layer This MUST be called before the VST3 plugin can use the Dart processor

Typedefs

CreateInstanceC = Pointer<Void> Function(Pointer<Utf8>)

CreateInstanceDart = Pointer<Void> Function(Pointer<Utf8>)

DartDisposeNative = Void Function()

DartGetParameterCountNative = Int32 Function()

DartGetParameterNative = Double Function(Int32)

DartInitializeProcessorNative = Void Function(Double, Int32)

Callback function signatures for FFI

DartProcessAudioNative = Void Function(Pointer<Float>, Pointer<Float>, Pointer<Float>, Pointer<Float>, Int32)

DartResetNative = Void Function()

DartSetParameterNative = Void Function(Int32, Double)

DisposeC = Void Function()

DisposeDart = void Function()

GetParameterC = Double Function(Int32 paramId)

GetParameterCountC = Int32 Function()

GetParameterCountDart = int Function()

GetParameterDart = double Function(int paramId)

InitializeProcessorC = Void Function(Double sampleRate, Int32 maxBlockSize)

C function type definitions for FFI callbacks

InitializeProcessorDart = void Function(double sampleRate, int maxBlockSize)

ProcessAudioC = Void Function(Pointer<Float> inputL, Pointer<Float> inputR, Pointer<Float> outputL, Pointer<Float> outputR, Int32 numSamples)

ProcessAudioDart = void Function(Pointer<Float> inputL, Pointer<Float> inputR, Pointer<Float> outputL, Pointer<Float> outputR, int numSamples)

RegisterCallbacksC = Int32 Function(Pointer<Void>, Pointer<DartVST3Callbacks>)

RegisterCallbacksDart = int Function(Pointer<Void>, Pointer<DartVST3Callbacks>)

ResetC = Void Function()

ResetDart = void Function()

SetParameterC = Void Function(Int32 paramId, Double normalizedValue)

SetParameterDart = void Function(int paramId, double normalizedValue)