How to detect key using pitch of audio ios app -

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is there body can me in finding pitch of audio file. have code in pitch calculating via mic, want detect pitch signal , strength?

for need use avaudioplayer . give peakpowers pitch of audio . these peakpowers signal strength , can animation that.

 audioplayer.meteringenabled = yes;     [audioplayer updatemeters]; if([audioplayer ismeteringenabled] ){     (int currchannel = 0; currchannel < [audioplayer numberofchannels]; currchannel++) {         //strength of audio channel         nslog(@"channel# %d %0.2f %0.2f", currchannel, [audioplayer peakpowerforchannel:currchannel], [audioplayer averagepowerforchannel:currchannel]);     } }

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