The structure of the LMMS core

Important classes

There are some important C++ classes in the LMMS codebase. Here are some examples:

• LmmsCore(also known as Engine): Holds the instances of other important classes, e.g. Song, AudioEngine, PatternStore, Mixer.

• Song: Controls the playback. Also works as a top-level container of LMMS projects.

• AudioEngine: Renders audio independently of audio backends. Also manages audio backends and MIDI interfaces.

• PlayHandle: Manages objects that plays sound, ex. notes, instruments, sample clips.

• AudioDevice: Base class for audio backends.

• Model: Models in sense of Model-view-controller pattern

  • AutomatableModel: Models which can be controlled by Controllers and/or AutomationPatterns, e.g. BoolModel, IntModel, FloatModel.

• Track: Base class for various types of tracks, including AutomationTrack, BBTrack, InstrumentTrack, and SampleTrack.

• Plugin: Base class for LMMS plugins(instruments and effects). For details on LMMS plugins, see the plugin system section.

  • Instrument: Generates audio signal from notes(from note clips or external MIDI inputs)

  • Effect: Transforms audio signal