Convert android camera image planes to a byte array for encoding or sending

Android_camera_image_planes_to_byte_array.kt

var yData = ByteArray(1)
var uData = ByteArray(1)
var vData = ByteArray(1)

for (i in 0 until 3) {
    val plane = image.planes[i]
    val bytes = ByteArray(plane.buffer.remaining())
    plane.buffer.get(bytes)
    when(i) {
        0 -> yData = bytes
        1 -> uData = bytes
        2 -> vData = bytes
    }
}

val ySize = yData.size
val uSize = uData.size
val vSize = vData.size

val size = ySize + uSize + vSize

val resultData = ByteArray(size)

System.arraycopy(yData, 0, resultData, 0, ySize)
System.arraycopy(uData, 0, resultData, ySize, uSize)
System.arraycopy(vData, 0, resultData, ySize + uSize, vSize)