/*

     File: AUEffectBase.h 

 Abstract:  Part of CoreAudio Utility Classes  

  Version: 1.0.1 

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple 

 Inc. ("Apple") in consideration of your agreement to the following 

 terms, and your use, installation, modification or redistribution of 

 this Apple software constitutes acceptance of these terms.  If you do 

 not agree with these terms, please do not use, install, modify or 

 redistribute this Apple software. 

 In consideration of your agreement to abide by the following terms, and 

 subject to these terms, Apple grants you a personal, non-exclusive 

 license, under Apple's copyrights in this original Apple software (the 

 "Apple Software"), to use, reproduce, modify and redistribute the Apple 

 Software, with or without modifications, in source and/or binary forms; 

 provided that if you redistribute the Apple Software in its entirety and 

 without modifications, you must retain this notice and the following 

 text and disclaimers in all such redistributions of the Apple Software. 

 Neither the name, trademarks, service marks or logos of Apple Inc. may 

 be used to endorse or promote products derived from the Apple Software 

 without specific prior written permission from Apple.  Except as 

 expressly stated in this notice, no other rights or licenses, express or 

 implied, are granted by Apple herein, including but not limited to any 

 patent rights that may be infringed by your derivative works or by other 

 works in which the Apple Software may be incorporated. 

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE 

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS 

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND 

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL 

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, 

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED 

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), 

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE 

 POSSIBILITY OF SUCH DAMAGE. 

 Copyright (C) 2012 Apple Inc. All Rights Reserved. 

*/

#ifndef __AUEffectBase_h__

#define __AUEffectBase_h__

#include "AUBase.h"

#include "AUSilentTimeout.h"

#include "CAException.h"

class AUKernelBase;

//  Base class for an effect with one input stream, one output stream,

//  any number of channels.

    /*! @class AUEffectBase */

class AUEffectBase : public AUBase {

public:

    /*! @ctor AUEffectBase */

                                AUEffectBase(   AudioComponentInstance      audioUnit,

                                                bool                        inProcessesInPlace = true );

    /*! @dtor ~AUEffectBase */

                                ~AUEffectBase();

    /*! @method Initialize */

    virtual OSStatus            Initialize();

    /*! @method Cleanup */

    virtual void                Cleanup();

    /*! @method Reset */

    virtual OSStatus            Reset(      AudioUnitScope              inScope,

                                            AudioUnitElement            inElement);

    /*! @method GetPropertyInfo */

    virtual OSStatus            GetPropertyInfo (AudioUnitPropertyID    inID,

                                            AudioUnitScope              inScope,

                                            AudioUnitElement            inElement,

                                            UInt32 &                    outDataSize,

                                            Boolean &                   outWritable);

    /*! @method GetProperty */

    virtual OSStatus            GetProperty (AudioUnitPropertyID        inID,

                                            AudioUnitScope              inScope,

                                            AudioUnitElement            inElement,

                                            void *                      outData);

    /*! @method SetProperty */

    virtual OSStatus            SetProperty(AudioUnitPropertyID         inID,

                                            AudioUnitScope              inScope,

                                            AudioUnitElement            inElement,

                                            const void *                inData,

                                            UInt32                      inDataSize);

    /*! @method StreamFormatWritable */

    virtual bool                StreamFormatWritable (AudioUnitScope    scope,

                                            AudioUnitElement            element);

    /*! @method ChangeStreamFormat */

    virtual OSStatus            ChangeStreamFormat (

                                        AudioUnitScope                      inScope,

                                        AudioUnitElement                    inElement,

                                        const CAStreamBasicDescription &    inPrevFormat,

                                        const CAStreamBasicDescription &    inNewFormat);

    /*! @method Render */

    virtual OSStatus    Render(AudioUnitRenderActionFlags &     ioActionFlags,

                                        const AudioTimeStamp &          inTimeStamp,

                                        UInt32                          inNumberFrames);

    // our virtual methods

    // If your unit processes N to N channels, and there are no interactions between channels,

    // it can override NewKernel to create a mono processing object per channel.  Otherwise,

    // don't override NewKernel, and instead, override ProcessBufferLists.

    /*! @method NewKernel */

    virtual AUKernelBase *      NewKernel() { return NULL; }

    /*! @method ProcessBufferLists */

    virtual OSStatus            ProcessBufferLists(

                                            AudioUnitRenderActionFlags &    ioActionFlags,

                                            const AudioBufferList &         inBuffer,

                                            AudioBufferList &               outBuffer,

                                            UInt32                          inFramesToProcess );

    // convenience format accessors (use output 0's format)

    /*! @method GetSampleRate */

    Float64                     GetSampleRate();

    /*! @method GetNumberOfChannels */

    UInt32                      GetNumberOfChannels();

    // convenience wrappers for accessing parameters in the global scope

    /*! @method SetParameter */

    using AUBase::SetParameter;

    void                        SetParameter(           AudioUnitParameterID            paramID,

                                                        AudioUnitParameterValue         value)

                                {

                                    Globals()->SetParameter(paramID, value);

                                }

    /*! @method GetParameter */

    using AUBase::GetParameter;

    AudioUnitParameterValue     GetParameter(           AudioUnitParameterID            paramID )

                                {

                                    return Globals()->GetParameter(paramID );

                                }

    /*! @method IsBypassEffect */

    // This is used for the property value - to reflect to the UI if an effect is bypassed

    bool                        IsBypassEffect () { return mBypassEffect; }

protected:

    /*! @method MaintainKernels */

    void                        MaintainKernels();

    /*! @method ShouldBypassEffect */

    // This is used in the render call to see if an effect is bypassed

    // It can return a different status than IsBypassEffect (though it MUST take that into account)

    virtual bool                ShouldBypassEffect () { return IsBypassEffect(); }

public:

    /*! @method SetBypassEffect */

    virtual void                SetBypassEffect (bool inFlag) { mBypassEffect = inFlag; }

    /*! @method SetParamHasSampleRateDependency */

    void                        SetParamHasSampleRateDependency (bool inFlag) 

                                { 

                                    mParamSRDep = inFlag; 

                                }

    /*! @method GetParamHasSampleRateDependency */

    bool                        GetParamHasSampleRateDependency () const { return mParamSRDep; }

    struct ScheduledProcessParams   // pointer passed in as void* userData param for ProcessScheduledSlice()

    {

        AudioUnitRenderActionFlags  *actionFlags;

        AudioBufferList             *inputBufferList;

        AudioBufferList             *outputBufferList;

    };

    virtual OSStatus            ProcessScheduledSlice(  void                *inUserData,

                                                        UInt32              inStartFrameInBuffer,

                                                        UInt32              inSliceFramesToProcess,

                                                        UInt32              inTotalBufferFrames );

    bool                            ProcessesInPlace() const {return mProcessesInPlace;};

    void                            SetProcessesInPlace(bool inProcessesInPlace) {mProcessesInPlace = inProcessesInPlace;};

    typedef std::vector<AUKernelBase *> KernelList;

protected:  

    /*! @var mKernelList */

    KernelList                      mKernelList;

    AUKernelBase* GetKernel(UInt32 index) { return mKernelList[index]; }

    /*! @method IsInputSilent */

    bool                            IsInputSilent (AudioUnitRenderActionFlags   inActionFlags, UInt32 inFramesToProcess)

                                    {

                                        bool inputSilent = (inActionFlags & kAudioUnitRenderAction_OutputIsSilence) != 0;

                                        // take latency and tail time into account when propagating the silent bit

                                        UInt32 silentTimeoutFrames = UInt32(GetSampleRate() * (GetLatency() + GetTailTime()));

                                        mSilentTimeout.Process (inFramesToProcess, silentTimeoutFrames, inputSilent);

                                        return inputSilent;

                                    }

#if TARGET_OS_IPHONE

    void SetOnlyOneKernel(bool inUseOnlyOneKernel) { mOnlyOneKernel = inUseOnlyOneKernel; } // set in ctor of subclass that wants it.

#endif

    template <typename T>

    void    ProcessBufferListsT(

                                        AudioUnitRenderActionFlags &    ioActionFlags,

                                        const AudioBufferList &         inBuffer,

                                        AudioBufferList &               outBuffer,

                                        UInt32                          inFramesToProcess );

private:

    /*! @var mBypassEffect */

    bool                            mBypassEffect;

    /*! @var mParamSRDep */

    bool                            mParamSRDep;

    /*! @var mProcessesInplace */

    bool                            mProcessesInPlace;

    /*! @var mSilentTimeout */

    AUSilentTimeout                 mSilentTimeout;

    /*! @var mMainOutput */

    AUOutputElement *               mMainOutput;

    /*! @var mMainInput */

    AUInputElement *                mMainInput;

#if TARGET_OS_IPHONE

    /*! @var mOnlyOneKernel */

    bool                            mOnlyOneKernel;

#endif

    /*! @var mCommonPCMFormat */

    CAStreamBasicDescription::CommonPCMFormat       mCommonPCMFormat;

    UInt32                          mBytesPerFrame;

};

//  Base class for a "kernel", an object that performs DSP on one channel of an interleaved stream.

    /*! @class AUKernelBase */

class AUKernelBase {

public:

    /*! @ctor AUKernelBase */

                                AUKernelBase(AUEffectBase *inAudioUnit ) :

                                    mAudioUnit(inAudioUnit) { }

    /*! @dtor ~AUKernelBase */

    virtual                     ~AUKernelBase() { }

    /*! @method Reset */

    virtual void                Reset() { }

    /*! @method Process */

    virtual void                Process(    const Float32 *                     inSourceP,

                                            Float32 *                           inDestP,

                                            UInt32                              inFramesToProcess,

                                            UInt32                              inNumChannels,

                                            bool &                              ioSilence) { throw CAException(kAudio_UnimplementedError ); }

    /*! @method Process */

    virtual void                Process(    const SInt32 *                      inSourceP,

                                            SInt32 *                            inDestP,

                                            UInt32                              inFramesToProcess,

                                            UInt32                              inNumChannels,

                                            bool &                              ioSilence) { throw CAException(kAudio_UnimplementedError ); }

    /*! @method Process */

    virtual void                Process(    const SInt16 *                      inSourceP,

                                            SInt16 *                            inDestP,

                                            UInt32                              inFramesToProcess,

                                            UInt32                              inNumChannels,

                                            bool &                              ioSilence) { throw CAException(kAudio_UnimplementedError ); }

    /*! @method GetSampleRate */

    Float64                     GetSampleRate()

                                {

                                    return mAudioUnit->GetSampleRate();

                                }

    /*! @method GetParameter */

    AudioUnitParameterValue     GetParameter (AudioUnitParameterID  paramID) 

                                {

                                    return mAudioUnit->GetParameter(paramID);

                                }

    void                        SetChannelNum (UInt32 inChan) { mChannelNum = inChan; }

    UInt32                      GetChannelNum () { return mChannelNum; }

protected:

    /*! @var mAudioUnit */

    AUEffectBase *      mAudioUnit;

    UInt32              mChannelNum;

};

template <typename T>

void    AUEffectBase::ProcessBufferListsT(

                                    AudioUnitRenderActionFlags &    ioActionFlags,

                                    const AudioBufferList &         inBuffer,

                                    AudioBufferList &               outBuffer,

                                    UInt32                          inFramesToProcess )

{

    bool ioSilence;

    bool silentInput = IsInputSilent (ioActionFlags, inFramesToProcess);

    ioActionFlags |= kAudioUnitRenderAction_OutputIsSilence;

    // call the kernels to handle either interleaved or deinterleaved

    if (inBuffer.mNumberBuffers == 1) {

        for (UInt32 channel = 0; channel < mKernelList.size(); ++channel) {

            AUKernelBase *kernel = mKernelList[channel];

            if (kernel == NULL) continue;

            ioSilence = silentInput;

            // process each interleaved channel individually

            kernel->Process(

                (const T *)inBuffer.mBuffers[0].mData + channel, 

                (T *)outBuffer.mBuffers[0].mData + channel,

                inFramesToProcess,

                inBuffer.mBuffers[0].mNumberChannels,

                ioSilence);

            if (!ioSilence)

                ioActionFlags &= ~kAudioUnitRenderAction_OutputIsSilence;

        }

    } else {

        for (UInt32 channel = 0; channel < mKernelList.size(); ++channel) {

            AUKernelBase *kernel = mKernelList[channel];

            if (kernel == NULL) continue;

            ioSilence = silentInput;

            const AudioBuffer *srcBuffer = &inBuffer.mBuffers[channel];

            AudioBuffer *destBuffer = &outBuffer.mBuffers[channel];

            kernel->Process(

                (const T *)srcBuffer->mData, 

                (T *)destBuffer->mData, 

                inFramesToProcess,

                1,

                ioSilence);

            if (!ioSilence)

                ioActionFlags &= ~kAudioUnitRenderAction_OutputIsSilence;

        }

    }

}

#endif // __AUEffectBase_h__