[WIP] UniFFI trial

Cargo.toml

@@ -5,6 +5,7 @@ members = [
     "livekit-api",
     "livekit-protocol",
     "livekit-ffi",
+    "livekit-uniffi",
     "livekit-runtime",
     "libwebrtc",
     "soxr-sys",
@@ -25,7 +26,7 @@ members = [
     "examples/save_to_disk",
     "examples/send_bytes",
     "examples/webhooks",
-    "examples/wgpu_room",
+    "examples/wgpu_room"
 ]
 
 [workspace.dependencies]

livekit-uniffi/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+name = "livekit-uniffi"
+version = "0.1.0"
+edition = "2021"
+license = "Apache-2.0"
+description = "Experimental FFI interface using UniFFI"
+repository = "https://github.com/livekit/rust-sdks"
+readme = "README.md"
+
+[dependencies]
+livekit-protocol = { workspace = true }
+livekit-api = { workspace = true }
+uniffi = { version = "0.30.0", features = ["cli", "scaffolding-ffi-buffer-fns"] }
+log = "0.4.28"
+tokio = { version = "1.48.0", features = ["sync"] }
+once_cell = "1.21.3"
+
+[build-dependencies]
+uniffi = { version = "0.30.0", features = ["build", "scaffolding-ffi-buffer-fns"] }
+
+[lib]
+crate-type = ["cdylib", "staticlib"]
+
+[[bin]]
+name = "uniffi-bindgen"
+path = "bindgen.rs"

livekit-uniffi/README.md

@@ -0,0 +1,19 @@
+# LiveKit UniFFI
+
+Experimental FFI interface using [UniFFI](https://mozilla.github.io/uniffi-rs/latest/).
+
+At this stage in development, this interface will not attempt to replace the existing FFI interface defined in [_livekit-ffi_](../livekit-ffi/). Instead, it will focus on exposing core business logic that can be cleanly modularized and adopted by client SDKs incrementally.
+
+## Functionality exposed
+
+- [x] Access token generation and verification
+
+## Generating bindings
+
+Use the _bindgen.sh_ script to generate language bindings for Swift, Kotlin, and Python.
+
+Later, this script will integrate community binding generators to support more languages.
+
+## Python test
+
+See the _python_test_ for a simple example of consuming the generated bindings. You will need to manually copy the compiled _livlivekit_uniffi_ to the same directory as the generated Python bindings before running—this will be automated shortly.

livekit-uniffi/bindgen.rs

@@ -0,0 +1,19 @@
+// Copyright 2025 LiveKit, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// This binary is included to allow invoking the UniFFI bindgen CLI from Cargo:
+/// `cargo run --bin uniffi-bindgen generate ...`
+fn main() {
+    uniffi::uniffi_bindgen_main()
+}

livekit-uniffi/bindgen.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+set -e
+
+cargo build --release
+
+bindgen() {
+  local lang=$1
+  # TODO: set the library extension based on platform (i.e., .so, .dylib, .dll)
+  cargo run --bin uniffi-bindgen generate \
+    --library ../target/release/liblivekit_uniffi.dylib \
+    --language "$lang" \
+    --out-dir "generated/$lang"
+}
+
+bindgen swift
+bindgen kotlin
+bindgen python