chore: remove lame encoder (#11529)

packages/frontend/media-capture-playground/server/encode.ts

@@ -0,0 +1,58 @@
+export function createWavBuffer(
+  samples: Float32Array,
+  options: {
+    sampleRate: number;
+    numChannels: number;
+  }
+) {
+  const { sampleRate = 44100, numChannels = 1 } = options;
+  const bitsPerSample = 16;
+  const bytesPerSample = bitsPerSample / 8;
+  const dataSize = samples.length * bytesPerSample;
+  const buffer = new ArrayBuffer(44 + dataSize); // WAV header is 44 bytes
+  const view = new DataView(buffer);
+
+  // Write WAV header
+  // "RIFF" chunk descriptor
+  writeString(view, 0, 'RIFF');
+  view.setUint32(4, 36 + dataSize, true); // File size - 8
+  writeString(view, 8, 'WAVE');
+
+  // "fmt " sub-chunk
+  writeString(view, 12, 'fmt ');
+  view.setUint32(16, 16, true); // Sub-chunk size
+  view.setUint16(20, 1, true); // Audio format (1 = PCM)
+  view.setUint16(22, numChannels, true); // Channels
+  view.setUint32(24, sampleRate, true); // Sample rate
+  view.setUint32(28, sampleRate * numChannels * bytesPerSample, true); // Byte rate
+  view.setUint16(32, numChannels * bytesPerSample, true); // Block align
+  view.setUint16(34, bitsPerSample, true); // Bits per sample
+
+  // "data" sub-chunk
+  writeString(view, 36, 'data');
+  view.setUint32(40, dataSize, true); // Sub-chunk size
+
+  // Write audio data
+  const offset = 44;
+  for (let i = 0; i < samples.length; i++) {
+    // Convert float32 to int16
+    const s = Math.max(-1, Math.min(1, samples[i]));
+    view.setInt16(
+      offset + i * bytesPerSample,
+      s < 0 ? s * 0x8000 : s * 0x7fff,
+      true
+    );
+  }
+
+  return buffer;
+}
+
+function writeString(
+  view: DataView<ArrayBuffer>,
+  offset: number,
+  string: string
+) {
+  for (let i = 0; i < string.length; i++) {
+    view.setUint8(offset + i, string.charCodeAt(i));
+  }
+}