Initial Commit

packages/media/audio/audio-codecs/src/codecs/webm.ts

@@ -0,0 +1,25 @@
+import { createWasmCodec } from "./wasm-base.js";
+
+function webmMagic(bytes: Uint8Array): boolean {
+    // EBML header: 0x1A 0x45 0xDF 0xA3
+    if (bytes.byteLength < 4) return false;
+    return (
+        bytes[0] === 0x1a &&
+        bytes[1] === 0x45 &&
+        bytes[2] === 0xdf &&
+        bytes[3] === 0xa3
+    );
+}
+
+/** Lazy WebM (audio track) codec backed by `@audio/decode-webm`. Decode-only. */
+export const WebMCodec = createWasmCodec({
+    name: "webm",
+    extensions: ["webm"],
+    mimeTypes: ["audio/webm"],
+    module: "@audio/decode-webm",
+    magic: webmMagic,
+    supportsEncode: false,
+    load: () =>
+        // @ts-expect-error optional dependency resolved at runtime
+        import("@audio/decode-webm"),
+});