将“AudioStreamPacketDescription”的代码转换为swift3.2

Posted 2023-03-09

【中文标题】将“AudioStreamPacketDescription”的代码转换为swift3.2

【英文标题】：Convert code of "AudioStreamPacketDescription" into swift3.2

【发布时间】：2018-03-10 06:06:51

【问题描述】：

我正在将Audio Queues Service 代码转换为swift3.2，但我卡在这里。我不知道如何在swift 更新版本中编写这行代码。

我想把下面的代码转换成 swift 3.2

player.packetDescs = UnsafeMutablePointer<AudiostreamPacketDescription>(malloc(sizeof(AudioStreamPacketDescription) * Int(player.numPacketsToRead)))

player 对象在哪里：

 class Player 
        var playbackFile: AudioFileID? = nil
        var packetPosition: Int64 = 0
        var numPacketsToRead: UInt32 = 0
        var packetDescs: UnsafeMutablePointer<AudioStreamPacketDescription>? = nil
        var isDone = false
    

我试过这个：

let j = MemoryLayout.size(ofValue: AudioStreamPacketDescription.self) * Int(player.numPacketsToRead)                
player.packetDescs = UnsafeMutablePointer<AudioStreamPacketDescription>(malloc(j))

但这给了我错误：

无法调用类型的初始化程序 带有参数的“UnsafeMutablePointer” '(UnsafeMutableRawPointer!)' 类型列表

【参考方案1】：

好的试试这个

let sizeTmp = MemoryLayout.size(ofValue: AudioStreamPacketDescription.self) * Int(player.numPacketsToRead)
let tmpPointer = UnsafeMutablePointer<AudioStreamPacketDescription>.allocate(capacity: sizeTmp)
player.packetDescs = tmpPointer