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/*=============================================================================
	AudioThruEngine.h
	
=============================================================================*/

#ifndef __AudioThruEngine_h__
#define __AudioThruEngine_h__

#include "AudioDevice.h"

class AudioRingBuffer;

class AudioThruEngine {
public:
	AudioThruEngine();
	~AudioThruEngine();
	
	void	SetDevices(AudioDeviceID input, AudioDeviceID output);
	void	SetInputDevice(AudioDeviceID input);
	void	SetOutputDevice(AudioDeviceID output);
	
	void	Start();
	bool	Stop();
	void	Mute(bool mute = true) { mMuting = mute; }
	bool	IsRunning() { return mRunning; }
	
	void	EnableThru(bool enable) { mThruing = enable; }
	void	SetBufferSize(UInt32 size);
	void	SetInputLoad(double load) { mInputLoad = load; }
	void	SetOutputLoad(double load) { mOutputLoad = load; }
	
	void	SetExtraLatency(SInt32 frames);
	double	GetThruTime() { return mThruTime; }
	SInt32	GetThruLatency() { return mActualThruLatency; }
	
	UInt32	GetOutputNchnls();
	AudioDeviceID	GetOutputDevice() { return mOutputDevice.mID; }
	AudioDeviceID	GetInputDevice() { return mInputDevice.mID; }
	
	OSStatus	MatchSampleRate(bool useInputDevice);
	
	// valid values are 0 to nchnls-1;  -1 = off
	void	SetChannelMap(int ch, int val) { mChannelMap[ch] = val; }
	int		GetChannelMap(int ch) { return mChannelMap[ch]; }
	
//	char *	GetErrorMessage() { return mErrorMessage; }

	Byte			*mWorkBuf;
	
	//iSchemy's edit
	void			SetCloneChannels(bool clone) { mCloneChannels = clone; }
	bool			CloneChannels() { return mCloneChannels; }
	
	
protected:
	enum IOProcState {
		kOff,
		kStarting,
		kRunning,
		kStopRequested
	};
	
//	void	ApplyLoad(double load);

	static OSStatus InputIOProc (	AudioDeviceID			inDevice,
									const AudioTimeStamp*	inNow,
									const AudioBufferList*	inInputData,
									const AudioTimeStamp*	inInputTime,
									AudioBufferList*		outOutputData,
									const AudioTimeStamp*	inOutputTime,
									void*					inClientData);

	static OSStatus OutputIOProc (	AudioDeviceID			inDevice,
									const AudioTimeStamp*	inNow,
									const AudioBufferList*	inInputData,
									const AudioTimeStamp*	inInputTime,
									AudioBufferList*		outOutputData,
									const AudioTimeStamp*	inOutputTime,
									void*					inClientData);

	static OSStatus OutputIOProc16 (	AudioDeviceID			inDevice,
									const AudioTimeStamp*	inNow,
									const AudioBufferList*	inInputData,
									const AudioTimeStamp*	inInputTime,
									AudioBufferList*		outOutputData,
									const AudioTimeStamp*	inOutputTime,
									void*					inClientData);
									
	void	ComputeThruOffset();

	AudioDevice		mInputDevice, mOutputDevice;
	bool			mRunning;
	bool			mMuting;
	bool			mThruing;
	IOProcState		mInputProcState, mOutputProcState;
	Float64			mLastInputSampleCount, mIODeltaSampleCount;
	UInt32			mBufferSize;
	SInt32			mExtraLatencyFrames;
	SInt32			mActualThruLatency;
	Float64			mSampleRate;
	Float64			mInToOutSampleOffset;		// subtract from the output time to obtain input time
	AudioRingBuffer *mInputBuffer;
	double			mInputLoad, mOutputLoad;
	double			mThruTime;
	
	int				mChannelMap[16];
	AudioDeviceIOProc mOutputIOProc;
	//char			mErrorMessage[128];
	
	// iSchemy's edit
	bool			mCloneChannels;
	// end

};


#endif // __AudioThruEngine_h__
