lv2-devel

LV2 is a plugin standard for audio systems, similar in scope to LADSPA, VST, AU, and others. It defines a C API for code and a format for data files which collectively describe a plugin. LV2 consists of a core (roughly equivalent in power to LADSPA) which can be extended to support more functionality. This allows the interface to be "grown" to accommodate the needs of real software as they arise. LV2 is both a stable interface and a forward-moving project: there is a stable set of "official" extensions in use while new functionality is actively developed. Most functionality required by modern plugins is available, including: * Audio, control, "control voltage" (audio-rate control), and event (e.g. MIDI) input and output * Expressive open-ended port metadata, including: - "Meaningful" controls (e.g. gain or envelope attack) allowing intelligent host control or UI generation - Control units (e.g. Hz, octaves, dB) - Multi-channel port groups (e.g. stereo, 5.1 surround, ambisonics * Embeddable GUIs in any toolkit, with support for a full plugin/UI split (including network transparency in capable hosts) * Ability to bundle any files (e.g. samples or impulses) with plugins * Presets (bundled and/or user saved) * Plugin state saving and restoring * Host-managed logging * Non-realtime plugin worker methods (simple and portable host-managed threading) * Message-based plugin communication, allowing plugins/UIs to have advanced interfaces without host support or specifications getting in the way * Transport awareness, both real time and tempo time (bars, beats, etc-.)