Function startArecordRecording

src/services/voice.ts:468–513

(
  onData: (chunk: Buffer) => void,
  onEnd: () => void,
)

}

function startArecordRecording(
  onData: (chunk: Buffer) => void,
  onEnd: () => void,
): boolean {
  // Record raw PCM: 16 kHz, 16-bit signed little-endian, mono, to stdout.
  // arecord does not support built-in silence detection, so this backend
  // is best suited for push-to-talk (silenceDetection: false).
  const args = [
    '-f',
    'S16_LE', // signed 16-bit little-endian
    '-r',
    String(RECORDING_SAMPLE_RATE),
    '-c',
    String(RECORDING_CHANNELS),
    '-t',
    'raw', // raw PCM, no WAV header
    '-q', // quiet — no progress output
    '-', // write to stdout
  ]

  const child = spawn('arecord', args, {
    stdio: ['pipe', 'pipe', 'pipe'],
  })

  activeRecorder = child

  child.stdout?.on('data', (chunk: Buffer) => {
    onData(chunk)
  })

  // Consume stderr to prevent backpressure
  child.stderr?.on('data', () => {})

  child.on('close', () => {
    activeRecorder = null
    onEnd()
  })

  child.on('error', err => {
    logError(err)
    activeRecorder = null
    onEnd()
  })

  return true
}

export function stopRecording(): void {
  if (nativeRecordingActive && audioNapi) {