VirtualAudioEngine.h   [plain text]


/*
  File:VirtualAudioDMAEngine.h

  Contains:

  Version:1.0.0

  Copyright:Copyright  1997-2002 by Apple Computer, Inc., All Rights Reserved.

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*/

#ifndef _VirtualAudioENGINE_H
#define _VirtualAudioENGINE_H

#include <IOKit/audio/IOAudioEngine.h>

#include "VirtualAudioDevice.h"

#define VirtualAudioEngine com_apple_driver_VirtualAudioEngine

class VirtualAudioEngine : public IOAudioEngine
{
    OSDeclareDefaultStructors(VirtualAudioEngine)
	
	UInt32					bufSize;
	void					*commonBuffer;
	
	IOTimerEventSource			*timerEventSource;
	
	UInt32					blockSize;	// In sample frames
	UInt32					numBlocks;
	UInt32					currentBlock;
	UInt32					blockTimeoutUS;
    
public:

    virtual bool init(OSDictionary *properties);
    virtual void free();
    
    virtual bool initHardware(IOService *provider);
    virtual void stop(IOService *provider);
    
    virtual bool createAudioStreams(IOAudioSampleRate *initialSampleRate);

    virtual IOReturn performAudioEngineStart();
    virtual IOReturn performAudioEngineStop();
    
    virtual UInt32 getCurrentSampleFrame();
    
    virtual IOReturn performFormatChange(IOAudioStream *audioStream, const IOAudioStreamFormat *newFormat, const IOAudioSampleRate *newSampleRate);

    virtual IOReturn clipOutputSamples(const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream);
    virtual IOReturn convertInputSamples(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream);
    
    static void timerFired(OSObject *target, IOTimerEventSource *sender);
    
};

extern "C" {
IOReturn clip24BitSamples(const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream);
IOReturn clip16BitSamples(const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream);
IOReturn process24BitSamples(const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream);
IOReturn process16BitSamples(const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream);
};

#endif /* _VirtualAudioENGINE_H */