我花了一些时间尝试自己调试它，但我似乎无法让AudioFileReadPacketData正确读取传入的数据。这几乎直接基于AppleAudioQueueServicesGuide。classSVNPlayer:SVNPlayback{varqueue:AudioQueueRef?varaudioFormat:AudioStreamBasicDescription!varplaybackFile:AudioFileID?varpacketDesc:AudioStreamPacketDescription!varisDone=falsevarpacketPosition:Int64=0v