clap-wrapper-rs

An easy way to use clap-wrapper in your Rust plugins!

Usecases

• Adding VST3 or AUv2 support to existing Rust plugin frameworks that do not support them
• Using nih-plug with non-GPLv3 licensed VST3 SDK
• Making your own audio plugin framework without dealing with VST3 and AUv2 directly

Features

• Provides a simple way to export Rust-based CLAP plugins as VST3 and AUv2 plugins.
• Builds "fat", self-contained binaries for VST3 and AUv2 plugins.
• Does not use cmake. Instead it uses the cc crate to compile the clap-wrapper code.
• Tested on Linux (Ubuntu 22.04), MacOS (13.7) and Windows (10). In theory the minimum supported OSX version is 10.12, but I have no way to test that.

Limitations

• Currently only supports VST3 and AUv2 plugins. Standalone builds are not supported yet.
• AUv2 wrapper can only export a single plugin per binary. If clap_entry exports multiple plugins, only the first one will be exported.

Usage

Add this to your Cargo.toml:

[dependencies]
clap-wrapper = "0.1.2"

Then, in your lib.rs:

// exports `GetPluginFactoryAUV2` symbol if CLAP_WRAPPER_AUV2_SDK env variable is present
clap_wrapper::export_auv2!(); 
// exports `GetPluginFactory` symbol and extra VST3 symbols if CLAP_WRAPPER_VST3_SDK env variable is present
clap_wrapper::export_vst3!(); 

This will export VST3 and AUv2 entrypoints that use the clap_entry symbol exported from your crate (as an example, nih_plug::nih_export_clap exports it).

To build the plugin with VST3 or AUv2 capabilities, add CLAP_WRAPPER_VST3_SDK and/or CLAP_WRAPPER_AUV2_SDK environment variables to your build command. For example:

CLAP_WRAPPER_VST3_SDK=/path/to/vst3sdk cargo build -p example-clap

Keep in mind, that clap-wrapper-rs only adds the necessary entrypoints that reexport the CLAP plugin you already have. You'd still have to use a crate like nih-plug to actually create the plugin.

After building, you have to manually "bundle" your plugin. This means setting up the correct directory structure and copying the necessary files. See VST 3 Developer Portal: Plug-in Format Structure for more info about VST3 directory structure. For AUv2, the directory structure is similar. Note that when building for MacOS you have to add a Info.plist file yourself. Check out Info.vst3.plist and Info.auv2.plist for an example of what Info.plist should look like.

See validate.yml for a complete example of how to build, bundle and validate a plugin.

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.