Function computeLevel

src/hooks/useVoice.ts:185–197

(chunk: Buffer)

// normalized 0-1 value. A sqrt curve spreads quieter levels across more
// of the visual range so the waveform uses the full set of block heights.
export function computeLevel(chunk: Buffer): number {
  const samples = chunk.length >> 1 // 16-bit = 2 bytes per sample
  if (samples === 0) return 0
  let sumSq = 0
  for (let i = 0; i < chunk.length - 1; i += 2) {
    // Read 16-bit signed little-endian
    const sample = ((chunk[i]! | (chunk[i + 1]! << 8)) << 16) >> 16
    sumSq += sample * sample
  }
  const rms = Math.sqrt(sumSq / samples)
  const normalized = Math.min(rms / 2000, 1)
  return Math.sqrt(normalized)
}

export function useVoice({
  onTranscript,