/*
     File: AUInputElement.h
 Abstract: Part of CoreAudio Utility Classes
  Version: 1.1

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*/
#ifndef __AUInput_h__
#define __AUInput_h__

#include "AUScopeElement.h"
#include "AUBuffer.h"

/*! @class AUInputElement */
class AUInputElement : public AUIOElement {
public:

	/*! @ctor AUInputElement */
						AUInputElement(AUBase *audioUnit);
	/*! @dtor ~AUInputElement */
	virtual				~AUInputElement() { }

	// AUElement override
	/*! @method SetStreamFormat */
	virtual OSStatus	SetStreamFormat(const CAStreamBasicDescription &desc);
	/*! @method NeedsBufferSpace */
	virtual bool		NeedsBufferSpace() const { return IsCallback(); }

	/*! @method SetConnection */
	void				SetConnection(const AudioUnitConnection &conn);
	/*! @method SetInputCallback */
	void				SetInputCallback(AURenderCallback proc, void *refCon);

	/*! @method IsActive */
	bool				IsActive() const { return mInputType != kNoInput; }
	/*! @method IsCallback */
	bool				IsCallback() const { return mInputType == kFromCallback; }
	/*! @method HasConnection */
	bool				HasConnection() const { return mInputType == kFromConnection; }

	/*! @method PullInput */
	OSStatus			PullInput(	AudioUnitRenderActionFlags &  	ioActionFlags,
									const AudioTimeStamp &			inTimeStamp,
									AudioUnitElement				inElement,
									UInt32							inNumberFrames);

	/*! @method PullInputWithBufferList */
	OSStatus			PullInputWithBufferList(	AudioUnitRenderActionFlags &  	ioActionFlags,
													const AudioTimeStamp &			inTimeStamp,
													AudioUnitElement				inElement,
													UInt32							nFrames,
													AudioBufferList *				inBufferList);
protected:
	/*! @method Disconnect */
	void				Disconnect();

	enum EInputType { kNoInput, kFromConnection, kFromCallback };

	/*! @var mInputType */
	EInputType					mInputType;

	// if from callback:
	/*! @var mInputProc */
	AURenderCallback			mInputProc;
	/*! @var mInputProcRefCon */
	void *						mInputProcRefCon;

	// if from connection:
	/*! @var mConnection */
	AudioUnitConnection			mConnection;
#if !CA_USE_AUDIO_PLUGIN_ONLY
	/*! @var mConnRenderProc */
	AudioUnitRenderProc			mConnRenderProc;
#endif
	/*! @var mConnInstanceStorage */
	void *						mConnInstanceStorage;		// for the input component
};


#endif // __AUInput_h__
