feat: added audio ext detection

src/decrypt-worker/util/transformBlob.ts

@@ -0,0 +1,31 @@
+import { Transformer, Parakeet, TransformResult, fetchParakeet } from '@jixun/libparakeet';
+
+export async function transformBlob(
+  blob: Blob,
+  transformerFactory: (p: Parakeet) => Transformer | Promise<Transformer>,
+  parakeet?: Parakeet
+) {
+  const cleanup: (() => void)[] = [];
+
+  try {
+    const mod = parakeet ?? (await fetchParakeet());
+    const transformer = await transformerFactory(mod);
+    cleanup.push(() => transformer.delete());
+
+    const reader = mod.make.Reader(await blob.arrayBuffer());
+    cleanup.push(() => reader.delete());
+
+    const sink = mod.make.WriterSink();
+    const writer = sink.getWriter();
+    cleanup.push(() => writer.delete());
+
+    const result = transformer.Transform(writer, reader);
+    if (result !== TransformResult.OK) {
+      throw new Error(`transform failed with error: ${TransformResult[result]} (${result})`);
+    }
+
+    return sink.collectBlob();
+  } finally {
+    cleanup.forEach((clean) => clean());
+  }
+}