/*

Copyright (C) 2016 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

Abstract:

Filter Effect AU

*/

#define kNumberOfResponseFrequencies 512

// Here we define a custom property so the view is able to retrieve the current frequency

// response curve.  The curve changes as the filter's cutoff frequency and resonance are

// changed...

// custom properties id's must be 64000 or greater

// see <AudioUnit/AudioUnitProperties.h> for a list of Apple-defined standard properties

//

enum

{

    kAudioUnitCustomProperty_FilterFrequencyResponse = 65536

};

// We'll define our property data to be a size kNumberOfResponseFrequencies array of structs

// The UI will pass in the desired frequency in the mFrequency field, and the Filter AU

// will provide the linear magnitude response of the filter in the mMagnitude field

// for each element in the array.

typedef struct FrequencyResponse

{

    Float64     mFrequency;

    Float64     mMagnitude;

} FrequencyResponse;