First attempt at writing the generator for this

agb-sound-converter/Cargo.lock

@@ -0,0 +1,54 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "agb_sound_converter"
+version = "0.1.0"
+dependencies = [
+ "hound",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "hound"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a164bb2ceaeff4f42542bdb847c41517c78a60f5649671b2a07312b6e117549"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edc3358ebc67bc8b7fa0c007f945b0b18226f78437d61bec735a9eb96b61ee70"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38bc8cc6a5f2e3655e0899c1b848643b2562f853f114bfec7be120678e3ace05"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.80"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d010a1623fbd906d51d650a9916aaefc05ffa0e4053ff7fe601167f3e715d194"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"

agb-sound-converter/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "agb_sound_converter"
+version = "0.1.0"
+authors = ["Gwilym Kuiper <gw@ilym.me>"]
+edition = "2018"
+license = "MPL-2.0"
+description = "Library for converting wavs for use on the Game Boy Advance"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+hound = "3.4.0"
+syn = "1.0.73"
+proc-macro2 = "1.0.27"
+quote = "1.0.9"

agb-sound-converter/src/lib.rs

@@ -0,0 +1,42 @@
+use hound;
+use proc_macro::TokenStream;
+use quote::quote;
+use std::path::Path;
+use syn::parse_macro_input;
+
+#[proc_macro]
+pub fn include_wav(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as syn::LitStr);
+
+    let filename = input.value();
+
+    let root = std::env::var("CARGO_MANIFEST_DIR").expect("Failed to get cargo manifest dir");
+    let path = Path::new(&root).join(&*filename);
+
+    let include_path = path.to_string_lossy();
+
+    let mut wav_reader = hound::WavReader::open(&path)
+        .unwrap_or_else(|_| panic!("Failed to load file {}", include_path));
+
+    assert_eq!(
+        wav_reader.spec().sample_rate,
+        10512,
+        "agb currently only supports sample rate of 10512Hz"
+    );
+
+    let samples = wav_reader
+        .samples::<i8>()
+        .map(|sample| sample.unwrap() as u8);
+
+    let result = quote! {
+        {
+            const _: &[u8] = include_bytes!(#include_path);
+
+            &[
+                #(#samples),*
+            ]
+        }
+    };
+
+    TokenStream::from(result)
+}