我一直在上下寻找如何创建VTCompressionSession(在swift)在2014WWDCVideo-'DirectAccesstoVideoEncodingandDecoding'中提到.以下代码适用于Objective-C:#import#importintmain(intargc,constchar*argv[]){@autoreleasepool{VTCompressionSessionRefsession;VTCompressionSessionCreate(NULL,500,500,kCMVideoCodecType_H264,NULL,NULL,NULL,NULL