A Kotlin beep function

Beep.kt

import kotlinx.coroutines.delay
import java.io.InputStream
import java.nio.ByteBuffer
import javax.sound.sampled.AudioFormat
import javax.sound.sampled.AudioInputStream
import javax.sound.sampled.AudioSystem
import javax.sound.sampled.Clip
import kotlin.math.sin
import kotlin.time.Duration
import kotlin.time.DurationUnit

// Based on https://gist.github.com/jbzdak/61398b8ad795d22724dd
suspend fun beep(freq: Double, duration: Duration) = AudioSystem.getClip().runUsing {
  require(format.encoding == AudioFormat.Encoding.PCM_SIGNED) { "Unknown encoding" }
  require(format.sampleSizeInBits == 16) { "Weird sample size.  Dunno what to do with it." }

  val frames = (duration * format.frameRate.toDouble()).toInt(DurationUnit.SECONDS)
  val data = buildBytes(frames * format.frameSize / 2) {
    val freqFactor = (Math.PI / 2) * freq / format.frameRate
    val ampFactor = Short.MAX_VALUE.toDouble()

    for (frame in 0 until frames)
      putShort((ampFactor * sin(frame * freqFactor)).toInt().toShort())
  }

  open(data.inputStream(), frames.toLong())
  start()
  delay(duration)
}

fun Clip.open(inputStream: InputStream, frameCount: Long) = open(AudioInputStream(inputStream, format, frameCount))
inline fun buildBytes(capacity: Int, block: ByteBuffer.() -> Unit): ByteArray =
  ByteBuffer.allocate(capacity).apply(block).array()

inline fun <T : AutoCloseable?, R> T.runUsing(block: T.() -> R): R = use(block)