Sine wave: Difference between revisions
→{{header|Kotlin}}: Added version based on Java Sound API.
(Added Kotlin) |
(→{{header|Kotlin}}: Added version based on Java Sound API.) |
||
Line 12:
=={{header|Kotlin}}==
===Using Java Sound API===
Although it's possible to generate and play a sine wave tone using the Java Sound API, it's far easier to invoke the SoX utility's 'play' command which has this stuff built-in. The following was tested on Ubuntu 16.04.▼
<lang scala>// Version 1.2.41
import javax.sound.sampled.AudioFormat
import javax.sound.sampled.AudioSystem
import kotlin.math.sin
import kotlin.math.PI
fun sineWave(frequency: Int, seconds: Int, sampleRate: Int): ByteArray {
val samples = seconds * sampleRate
val result = ByteArray(samples)
val interval = sampleRate.toDouble() / frequency
for (i in 0 until samples) {
val angle = 2.0 * PI * i / interval
result[i] = (sin(angle) * 127).toByte()
}
return result
}
fun main(args: Array<String>) {
val sampleRate = 44000
val buffer = sineWave(440, 5, sampleRate)
val format = AudioFormat(sampleRate.toFloat(), 8, 1, true, true)
val line = AudioSystem.getSourceDataLine(format)
with (line) {
open(format)
start()
write(buffer, 0, buffer.size)
drain()
close()
}
}</lang>
===Invoking SoX===
▲
<lang scala>// Version 1.2.41
| |||