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Create a pre-equalizer in iOS

I am creating a music player application using AVplayer. The app accesses and plays songs from the iPod library. So I play mediaItem usingAVPlayer

MPMediaItem *mediaItem = ...
NSURL *assetUrl = [mediaItem valueForProperty:MPMediaItemPropertyAssetURL];
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:assetUrl];
self.player = [AVPlayer playerWithPlayerItem:playerItem];

I need to add a graphic equalizer to my application so that users can change the following values

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Audio processing in iOS seems to be different from other frameworks. I did R&D and found

  • Audio device
  • MTAudioProcessingTap
  • NVDSP
  • novocaine
  • Openal

My questions: Is it possible to create a custom equalizer using AVPlayer? What technology should I use for my requirement (creating a custom equalizer using AVPlayer)?

P.S. - , , ( , )

btw eq lib https://github.com/clementprem/CPAudioPlayer

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2

AVPlayer , .

, Novocaine, NVDSP Audio Unit ( , ). Novocaine Equalizer, ( , ).

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NOVOCAINE.

, NVPeakingEQFilter:

    NVPeakingEQFilter* PEQ = [[NVPeakingEQFilter alloc] initWithSamplingRate:self.samplingRate];
    PEQ.Q = QFactor;
    PEQ.G = gain;
    PEQ.centerFrequency = centerFrequencies;

3 : Q, G centerFrequency. Q, centerFrequency (QFactor , 2.0).

, 10 : . iTunes: 32 , 64 , 125 , 250 , 500 , 1 , 2 , 4 , 8 , 16 . .

, , (G). G 0.0. " /".

, G, :

PEQ [sender.tag - 1].G = sender.value * kNominalGainRange;

kNominalGainRange - 12.0, , sender.value -1.0 +1.0, G -12 +12.

, .

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