livekit-utils crate + VideoRenderer proto

crates/livekit-utils/src/enum_dispatch.rs

@@ -0,0 +1,25 @@
+#[macro_export]
+macro_rules! enum_dispatch {
+    // This arm is used to avoid nested loops with the arguments
+    // The arguments are transformed to $combined_args TokenTree
+    (@match $self:ident $fnc:ident $combined_args:tt [$($variant:ident),+]) => {
+        match $self {
+            $(
+                Self::$variant(inner) => inner.$fnc$combined_args,
+            )+
+        }
+    };
+
+    ($fnc:ident, $self:ty, [$($arg:ident: $t:ty),*], $ret:ty, [$($variant:ident),+]) => {
+        fn $fnc(self: $self, $($arg: $t),*) -> $ret {
+            enum_dispatch!(@match self $fnc ($($arg,)*) [$($variant),+])
+        }
+    };
+
+    ($variants:tt $(fnc!($fnc:ident, $self:ty, $args:tt, $ret:ty);)+) => {
+        $(
+            enum_dispatch!($fnc, $self, $args, $ret, $variants);
+        )*
+    };
+}
+

crates/livekit-utils/src/lib.rs

@@ -0,0 +1 @@
+pub mod enum_dispatch;