fix

electron/sound-check.ts

@@ -0,0 +1,53 @@
+const sampleRate = 16000
+export const soundCheckWav = Buffer.alloc(44 + sampleRate * 2)
+soundCheckWav.write('RIFF', 0)
+soundCheckWav.writeUInt32LE(soundCheckWav.length - 8, 4)
+soundCheckWav.write('WAVEfmt ', 8)
+soundCheckWav.writeUInt32LE(16, 16)
+soundCheckWav.writeUInt16LE(1, 20)
+soundCheckWav.writeUInt16LE(1, 22)
+soundCheckWav.writeUInt32LE(sampleRate, 24)
+soundCheckWav.writeUInt32LE(sampleRate * 2, 28)
+soundCheckWav.writeUInt16LE(2, 32)
+soundCheckWav.writeUInt16LE(16, 34)
+soundCheckWav.write('data', 36)
+soundCheckWav.writeUInt32LE(sampleRate * 2, 40)
+for (let sample = 0; sample < sampleRate; sample++) {
+  const time = sample / sampleRate
+  const start = time < 0.5 ? 0.05 : 0.55
+  const elapsed = time - start
+  if (elapsed < 0 || elapsed >= 0.4) continue
+  const envelope = Math.min(1, elapsed / 0.02, (0.4 - elapsed) / 0.02)
+  const frequency = time < 0.5 ? 440 : 660
+  soundCheckWav.writeInt16LE(Math.round(6553 * envelope * Math.sin(2 * Math.PI * frequency * elapsed)), 44 + sample * 2)
+}
+
+// Runs in the audio devices renderer; keep this function independent of module imports.
+export function playSoundCheck(): Promise<void> {
+  const media = document.querySelector('audio')
+  if (!media) return Promise.reject(new Error('Проверка звука недоступна'))
+  return new Promise<void>((resolve, reject) => {
+    let finished = false
+    const finish = (error?: Error) => {
+      if (finished) return
+      finished = true
+      clearTimeout(timeout)
+      media.removeEventListener('ended', ended)
+      media.removeEventListener('error', failed)
+      media.pause()
+      media.removeAttribute('src')
+      media.load()
+      if (error) reject(error)
+      else resolve()
+    }
+    const ended = () => finish()
+    const failed = () => finish(new Error('Не удалось воспроизвести проверочный сигнал'))
+    const timeout = setTimeout(() => finish(new Error('Превышено время проверки звука')), 3000)
+    media.addEventListener('ended', ended)
+    media.addEventListener('error', failed)
+    media.muted = false
+    media.volume = 1
+    media.src = 'screen-app://app/sound-check.wav'
+    void media.play().catch(failed)
+  })
+}