import CoreMIDI

extension MIDIPacket {
    static func channel(status: UInt8, data1: UInt8, data2: UInt8) -> MIDIPacket {
        let newPacket = UnsafeMutablePointer<MIDIPacket>.alloc(1)
        newPacket.memory.length = 3

        withUnsafePointer(&newPacket.memory.data, { (ptr) -> () in
            let dataPtr = UnsafeMutablePointer<UInt8>(ptr)
            dataPtr[0] = status
            dataPtr[1] = data1
            dataPtr[2] = data2
        })

        let ret = newPacket.memory
        newPacket.dealloc(1)

        return ret
    }
}

logPacket(MIDIPacket.channel(0x90, data1: 20, data2: 127))