ios - AudioToolbox to play nsdata in download -

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i'm trying play audio audiotoolbox in xcode. search documentation little. want play nsdata while download internet. link: http://www.cocoawithlove.com/2008/09/streaming-and-playing-live-mp3-stream.html , apple developer documentation can't understand have cast nsdata (that not complete because in download) in data audiotoolbox can read. apple documentation understand strutture must allocate:

typedef struct myaqstruct {     audiofileid                     maudiofile;     audiostreambasicdescription     mdataformat;     audioqueueref                   mqueue;     audioqueuebufferref             mbuffers[knumberbuffers];     sint64                          mcurrentpacket;     uint32                          mnumpacketstoread;     audiostreampacketdescription    *mpacketdescs;     bool                            mdone; }myaqstruct;

and callback function have call play, of variabile in struct rapresent data? maybe think audiostreambasicdescription. or audiofileid? , how can cast nsdata type?


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