Fix deprecation warnings and add aarch64 build support

.cargo/config.toml

@@ -0,0 +1,2 @@
+[target.aarch64-unknown-linux-gnu]
+rustflags = ["-C", "target-feature=+fp16"]

.github/workflows/rust_ci.yml

@@ -41,3 +41,47 @@ jobs:
 
       - name: Build binary
         run: cargo build --release
+
+  build-aarch64:
+    name: Build (aarch64)
+    runs-on: ubuntu-latest
+    container:
+      image: debian:bookworm-slim
+    steps:
+      - name: Install base dependencies
+        shell: bash
+        run: |
+          set -euo pipefail
+          export DEBIAN_FRONTEND=noninteractive
+          dpkg --add-architecture arm64
+          apt-get update
+          apt-get install -y --no-install-recommends \
+            ca-certificates \
+            pkg-config \
+            libssl-dev \
+            libssl-dev:arm64 \
+            gcc-aarch64-linux-gnu \
+            libc6-dev-arm64-cross \
+            build-essential \
+            git \
+            curl \
+            unzip \
+            cmake
+
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Add Rust target
+        run: rustup target add aarch64-unknown-linux-gnu
+
+      - name: Build binary
+        env:
+          CC_aarch64_unknown_linux_gnu: aarch64-linux-gnu-gcc
+          AR_aarch64_unknown_linux_gnu: aarch64-linux-gnu-ar
+          CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: aarch64-linux-gnu-gcc
+          PKG_CONFIG_ALLOW_CROSS: "1"
+          PKG_CONFIG_PATH: /usr/lib/aarch64-linux-gnu/pkgconfig
+        run: cargo build --release --target aarch64-unknown-linux-gnu

README.md

@@ -59,6 +59,12 @@ Edit `config.toml` to customize the VAD, ASR, LLM, TTS services, as well as prom
 cargo build --release
 ```
 
+**Note for aarch64 (ARM64) builds:** When cross-compiling for aarch64, the required `fp16` target feature is automatically enabled via `.cargo/config.toml`. If building natively on aarch64, you may need to set:
+
+```
+RUSTFLAGS="-C target-feature=+fp16" cargo build --release
+```
+
 ### Configure AI services
 
 The `config.toml` can use any combination of open-source or proprietary AI services, as long as they offer OpenAI-compatible API endpoints. Here are instructions to start open source AI servers for the EchoKit server.

src/main.rs

@@ -7,6 +7,7 @@ use axum::{
 use clap::Parser;
 use config::Config;
 
+#[allow(deprecated)]
 use crate::{config::ASRConfig, services::realtime_ws::StableRealtimeConfig};
 
 pub mod ai;
@@ -55,9 +56,11 @@ async fn routes(
     });
 
     let mut tool_set = ai::openai::tool::ToolSet::default();
+    #[allow(deprecated)]
     let mut real_config: Option<StableRealtimeConfig> = None;
 
     // todo: support other configs
+    #[allow(deprecated)]
     match &config.config {
         config::AIConfig::Stable {
             llm: config::LLMConfig::OpenAIChat(chat_llm),
@@ -173,6 +176,7 @@ async fn routes(
         )))
         .layer(axum::Extension(record_config.clone()));
 
+    #[allow(deprecated)]
     if let Some(real_config) = real_config {
         log::info!(
             "Adding realtime WebSocket handler with config: {:?}",

src/services/realtime_ws.rs

@@ -1,3 +1,5 @@
+#![allow(deprecated)]
+
 use axum::{
     extract::{Extension, WebSocketUpgrade, ws::WebSocket},
     response::IntoResponse,