Add features and start writing interfaces

.pre-commit-config.yaml

@@ -4,6 +4,7 @@ repos:
     hooks:
       - id: check-added-large-files
       - id: check-merge-conflict
+      - id: check-toml
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/codespell-project/codespell

Cargo.lock

@@ -26,6 +26,20 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "coreaudio-rs"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aae284fbaf7d27aa0e292f7677dfbe26503b0d555026f702940805a630eac17"
+dependencies = [
+ "bitflags 1.3.2",
+ "libc",
+ "objc2-audio-toolbox",
+ "objc2-core-audio",
+ "objc2-core-audio-types",
+ "objc2-core-foundation",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.15"
@@ -41,10 +55,21 @@ version = "0.8.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28"
 
+[[package]]
+name = "dispatch2"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89a09f22a6c6069a18470eb92d2298acf25463f14256d24778e1230d789a2aec"
+dependencies = [
+ "bitflags 2.10.0",
+ "objc2",
+]
+
 [[package]]
 name = "engine"
 version = "0.1.0"
 dependencies = [
+ "coreaudio-rs",
  "jack",
  "lib",
 ]
@@ -141,6 +166,78 @@ version = "0.4.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34080505efa8e45a4b816c349525ebe327ceaa8559756f0356cba97ef3bf7432"
 
+[[package]]
+name = "objc2"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7c2599ce0ec54857b29ce62166b0ed9b4f6f1a70ccc9a71165b6154caca8c05"
+dependencies = [
+ "objc2-encode",
+]
+
+[[package]]
+name = "objc2-audio-toolbox"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6948501a91121d6399b79abaa33a8aa4ea7857fe019f341b8c23ad6e81b79b08"
+dependencies = [
+ "bitflags 2.10.0",
+ "libc",
+ "objc2",
+ "objc2-core-audio",
+ "objc2-core-audio-types",
+ "objc2-core-foundation",
+ "objc2-foundation",
+]
+
+[[package]]
+name = "objc2-core-audio"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1eebcea8b0dbff5f7c8504f3107c68fc061a3eb44932051c8cf8a68d969c3b2"
+dependencies = [
+ "dispatch2",
+ "objc2",
+ "objc2-core-audio-types",
+ "objc2-core-foundation",
+]
+
+[[package]]
+name = "objc2-core-audio-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a89f2ec274a0cf4a32642b2991e8b351a404d290da87bb6a9a9d8632490bd1c"
+dependencies = [
+ "bitflags 2.10.0",
+ "objc2",
+]
+
+[[package]]
+name = "objc2-core-foundation"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a180dd8642fa45cdb7dd721cd4c11b1cadd4929ce112ebd8b9f5803cc79d536"
+dependencies = [
+ "bitflags 2.10.0",
+ "dispatch2",
+ "objc2",
+]
+
+[[package]]
+name = "objc2-encode"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef25abbcd74fb2609453eb695bd2f860d389e457f67dc17cafc8b8cbc89d0c33"
+
+[[package]]
+name = "objc2-foundation"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3e0adef53c21f888deb4fa59fc59f7eb17404926ee8a6f59f5df0fd7f9f3272"
+dependencies = [
+ "objc2",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"

engine/Cargo.toml

@@ -4,5 +4,10 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-jack = "0.13.3"
+coreaudio-rs = { version = "0.13.0", optional = true }
+jack = {version = "0.13.3", optional = true }
 lib = { path = "../lib/" }
+
+[features]
+jack = ["dep:jack"]
+coreaudio = ["dep:coreaudio-rs"]

engine/src/audio_engine/mod.rs

@@ -0,0 +1,12 @@
+mod jack;
+mod coreaudio;
+
+trait AudioBackend {
+    // Start a audio backend client
+    // It should be executed either on the startup,
+    // or when the audio backend is switched
+    fn start_client();
+    // Initialization of the client should happen
+    // when a project is opened.
+    fn init_client();
+}

engine/src/main.rs

@@ -1,3 +1,5 @@
+mod audio_engine;
+
 use lib::{self, metadata::Metadata, track::Track};
 
 fn main() {

examples/jack-sine/README.md

@@ -1,2 +1 @@
 Set this on mac ❯ export DYLD_FALLBACK_LIBRARY_PATH="$(brew --prefix jack)/lib:${DYLD_FALLBACK_LIBRARY_PATH:-}"
-