/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 This class handles buffering of audio data that is shared between the view and audio controller

 */

#ifndef __aurioTouch3__BufferManager__

#define __aurioTouch3__BufferManager__

#include <AudioToolbox/AudioToolbox.h>

#include <libkern/OSAtomic.h>

#include "FFTHelper.h"

const UInt32 kNumDrawBuffers = 12;

const UInt32 kDefaultDrawSamples = 1024;

class BufferManager

{

public:

    BufferManager( UInt32 inMaxFramesPerSlice );

    ~BufferManager();

    void            SetDisplayMode ( UInt32 inDisplayMode ) { mDisplayMode = inDisplayMode; }

    UInt32          GetDisplayMode () { return mDisplayMode; }

    Float32**       GetDrawBuffers ()  { return mDrawBuffers; }

    void            CopyAudioDataToDrawBuffer( Float32* inData, UInt32 numFrames );

    void            CycleDrawBuffers();

    void            SetCurrentDrawBufferLength ( UInt32 inDrawBufferLen ) { mCurrentDrawBufferLen = inDrawBufferLen; }

    UInt32          GetCurrentDrawBufferLength ()   { return mCurrentDrawBufferLen; }

    bool            HasNewFFTData()     { return static_cast<bool>(mHasNewFFTData); };

    bool            NeedsNewFFTData()   { return static_cast<bool>(mNeedsNewFFTData); };

    void            CopyAudioDataToFFTInputBuffer( Float32* inData, UInt32 numFrames );

    UInt32          GetFFTOutputBufferLength() { return mFFTInputBufferLen / 2; }

    void            GetFFTOutput ( Float32* outFFTData );

private:

    UInt32          mDisplayMode;

    Float32*        mDrawBuffers[kNumDrawBuffers];

    UInt32          mDrawBufferIndex;

    UInt32          mCurrentDrawBufferLen;

    Float32*        mFFTInputBuffer;

    UInt32          mFFTInputBufferFrameIndex;

    UInt32          mFFTInputBufferLen;

    volatile int32_t mHasNewFFTData;

    volatile int32_t mNeedsNewFFTData;

    FFTHelper*      mFFTHelper;

};

#endif /* defined(__aurioTouch3__BufferManager__) */