KMP IOS convert PCM float 32 bit to PCM int 16 bit

fun convertMonoPCMFloat32ToMonoPCMInt16(inputBuffer: AVAudioPCMBuffer, outputSampleRate: Double): ByteArray {
    val floatChannelData = inputBuffer.floatChannelData!!
    val frameLength = inputBuffer.frameLength.toInt()
    val channelCount = inputBuffer.format.channelCount
    val inputSampleRate = inputBuffer.format.sampleRate

    val resampleRatio = inputSampleRate / outputSampleRate
    val outputFrameLength = (frameLength.toDouble() / resampleRatio).toInt()
    val outputSize = outputFrameLength * channelCount.toInt()
    val outputBuffer = ByteArray(outputSize * 2) // 2 bytes per Int16 sample

    var outputIndex = 0
    for (outputFrame in 0 until outputFrameLength) {
        val inputFrameFloat = outputFrame * resampleRatio
        val inputFrame = inputFrameFloat.toInt()
        val fraction = inputFrameFloat - inputFrame

        for (channel in 0 until channelCount.toInt()) {
            // Linear interpolation for resampling
            val sample1 = floatChannelData[channel]!![inputFrame]
            val sample2 = if (inputFrame + 1 < frameLength) floatChannelData[channel]!![inputFrame + 1] else sample1
            val interpolatedSample = (1 - fraction) * sample1 + fraction * sample2

            // Convert to Int16
            val int16Sample = (interpolatedSample * Short.MAX_VALUE).toInt()
                .coerceIn(Short.MIN_VALUE.toInt(), Short.MAX_VALUE.toInt()).toShort()

            outputBuffer[outputIndex++] = int16Sample.toByte()
            outputBuffer[outputIndex++] = (int16Sample.toInt() shr 8).toByte()
        }
    }

    return outputBuffer
}