AVFrameのtupleのデータをArrayで変換 ref: http://qiita.com/funcodes/items/7b91c6b740f42ea66a04

file0.txt

typedef struct AVFrame {
   ...
   uint8_t *data[AV_NUM_DATA_POINTERS]; // AV_NUM_DATA_POINTERS = 8
   ...

file1.txt

public struct AVFrame {
    public var data: (UnsafeMutablePointer<UInt8>?, UnsafeMutablePointer<UInt8>?, UnsafeMutablePointer<UInt8>?, UnsafeMutablePointer<UInt8>?, UnsafeMutablePointer<UInt8>?, UnsafeMutablePointer<UInt8>?, UnsafeMutablePointer<UInt8>?, UnsafeMutablePointer<UInt8>?)

file2.txt

let tuplePointer: UnsafePointer<(UnsafePointer<UInt8>?, UnsafePointer<UInt8>?, ...)> = withUnsafePointer(to: $tuplePointer){$0}
let unsignedInteger8Buffer: UnsafePointer<UnsafePointer<UInt8>?> = UnsafePointer(tuplePointer.withMemoryRebound(to: (UnsafePointer<UInt8>?.self)!, capacity: 8){$0}
let bufferPointer: UnsafeBufferPointer<UnsafePointer<UInt8>?> = UnsafeBufferPointer(start: unsignedInteger8Buffer, count: 8)
let arr = Array(bufferPointer)