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+/*
+     File: AUEffectBase.h
+ Abstract: Part of CoreAudio Utility Classes
+  Version: 1.1
+ 
+ Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple
+ Inc. ("Apple") in consideration of your agreement to the following
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+ 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
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+ without modifications, you must retain this notice and the following
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+ 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,
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+ 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) 2014 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 CanScheduleParameters */
+	virtual bool				CanScheduleParameters() const { return true; }
+	
+	/*! @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 );
+
+	CAStreamBasicDescription::CommonPCMFormat GetCommonPCMFormat() const { return mCommonPCMFormat; }
+	
+
+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) {
+		if (inBuffer.mBuffers[0].mNumberChannels == 0)
+			throw CAException(kAudio_ParamError);
+			
+		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__