objective c - How to detect BPM of audio file in iOS app -


I tried to find a BPM using the AVFoundation frame but 0 As a result and not able to get BPM.

This is my code, 

  MP3 MPIDITEM * MediaItem = [[archive items] ObjectTyndex: 0]; NSSTING * Album IDK == [MPMDITIM continuous IPProtforforcing type: MPMedia grouping album]; NSLog (@ "MPMDIT:% @", ALBIDK); Int BPM = [[Mediimetam ManfourProperty: MPMDITIMProperty BeatsPerminute] Intuue]; NSSTING * BPM = [MediaItem ManForProperty: MPMDITIMPropertyBitsPerminate]; NSLog (@ "BPM:% @", BPM); NSDRAEL * URL = [Media Itam Value Property: MP MPITM PropertyAsset URL];   
 Am I missing anything here?   
 
 
 BPM extracted with metadata with audio file that is often not present, it is not calculated from audio  
 Also keep in mind that any BPM metadata is present, it is faulty with the assumption that there is constant speed in one track. Not always a safe assumption  
 quality audio-metadata    can be obtained from

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