Initial Commit

packages/media/audio/audio-cli/tests/helpers.ts

@@ -0,0 +1,27 @@
+import { writeFile } from "node:fs/promises";
+import { WavCodec } from "@suaveplan/audio-codecs";
+
+/** Write a minimal mono 44.1 kHz WAV file for fixture purposes. */
+export async function writeWav(path: string, samples = 256): Promise<void> {
+    const bytes = await WavCodec.encode([new Float32Array(samples)], {
+        sampleRate: 44_100,
+        bitDepth: 16,
+        format: "pcm",
+    });
+    await writeFile(path, bytes);
+}
+
+/** Write a noisy 44.1 kHz mono WAV file so loudness analyses report a value. */
+export async function writeNoisyWav(
+    path: string,
+    samples = 44_100
+): Promise<void> {
+    const buf = new Float32Array(samples);
+    for (let i = 0; i < samples; i++) buf[i] = Math.sin(i * 0.01) * 0.5;
+    const bytes = await WavCodec.encode([buf], {
+        sampleRate: 44_100,
+        bitDepth: 16,
+        format: "pcm",
+    });
+    await writeFile(path, bytes);
+}