/*

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

See LICENSE.txt for this sample’s licensing information

Abstract:

Instrument AU

*/

#include "AUInstrumentBase.h"

#include "SinSynthVersion.h"

static const UInt32 kNumNotes = 12;

struct TestNote : public SynthNote

{

    virtual                 ~TestNote() {}

    virtual bool            Attack(const MusicDeviceNoteParams &inParams)

                                { 

#if DEBUG_PRINT

                                    printf("TestNote::Attack %p %d\n", this, GetState());

#endif

                                    double sampleRate = SampleRate();

                                    phase = 0.;

                                    amp = 0.;

                                    maxamp = 0.4 * pow(inParams.mVelocity/127., 3.); 

                                    up_slope = maxamp / (0.1 * sampleRate);

                                    dn_slope = -maxamp / (0.9 * sampleRate);

                                    fast_dn_slope = -maxamp / (0.005 * sampleRate);

                                    return true;

                                }

    virtual void            Kill(UInt32 inFrame); // voice is being stolen.

    virtual void            Release(UInt32 inFrame);

    virtual void            FastRelease(UInt32 inFrame);

    virtual Float32         Amplitude() { return amp; } // used for finding quietest note for voice stealing.

    virtual OSStatus        Render(UInt64 inAbsoluteSampleFrame, UInt32 inNumFrames, AudioBufferList** inBufferList, UInt32 inOutBusCount);

    double phase, amp, maxamp;

    double up_slope, dn_slope, fast_dn_slope;

};

class SinSynth : public AUMonotimbralInstrumentBase

{

public:

                                SinSynth(AudioUnit inComponentInstance);

    virtual                     ~SinSynth();

    virtual OSStatus            Initialize();

    virtual void                Cleanup();

    virtual OSStatus            Version() { return kSinSynthVersion; }

    virtual AUElement*          CreateElement(          AudioUnitScope                  scope,

                                              AudioUnitElement              element);

    virtual OSStatus            GetParameterInfo(       AudioUnitScope                  inScope,

                                                        AudioUnitParameterID            inParameterID,

                                                        AudioUnitParameterInfo &        outParameterInfo);

    MidiControls*               GetControls( MusicDeviceGroupID inChannel)

    {

        SynthGroupElement *group = GetElForGroupID(inChannel);

        return (MidiControls *) group->GetMIDIControlHandler();

    }

private:

    TestNote mTestNotes[kNumNotes];

};