WavHeader.kt

import java.io.IOException
import java.io.OutputStream

class WavHeader (
    private val format: Int = 0,
    private val channels: Int = 0,
    private val hertz: Int = 0,
    private val bitrate: Int = 0,
    private val size: Int = 0
) {

    @Throws(IOException::class)
    fun write(out: OutputStream): Int {
        writeId(out, "RIFF")
        writeInt(out, size)
        writeId(out, "WAVEfmt ")
        writeInt(out, 16)
        writeShort(out, format)
        writeShort(out, channels)
        writeInt(out, hertz)
        writeInt(out, channels * hertz * bitrate / 8)
        writeShort(out, channels * bitrate / 8)
        writeShort(out, bitrate)
        writeId(out, "data")
        writeInt(out, size)
        return 44
    }

    companion object {

        @Throws(IOException::class)
        private fun writeId(out: OutputStream, id: String) {
            for (element in id) out.write(element.toInt())
        }

        @Throws(IOException::class)
        private fun writeInt(out: OutputStream, v: Int) {
            out.write(v shr 0)
            out.write(v shr 8)
            out.write(v shr 16)
            out.write(v shr 24)
        }

        @Throws(IOException::class)
        private fun writeShort(out: OutputStream, v: Int) {
            out.write(v shr 0)
            out.write(v shr 8)
        }
    }
}