typealias VTCompressionSessionRef = VTCompressionSession

class VTCompressionSession {
}

typealias VTDecompressionSessionRef = VTDecompressionSession

class VTDecompressionSession {
}

typealias VTFrameSiloRef = VTFrameSilo

class VTFrameSilo {
}

typealias VTMultiPassStorageRef = VTMultiPassStorage

class VTMultiPassStorage {
}

typealias VTPixelTransferSessionRef = VTPixelTransferSession

class VTPixelTransferSession {
}

typealias VTSessionRef = VTSession

typealias VTSession = CFTypeRef