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utils/scenemanager/sound.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+#ifndef SOUND_H
+#define SOUND_H
+#pragma once
+
+class CAudioMixer;
+
+class CAudioInput
+{
+public:
+	// factory to create a suitable audio input for this system
+	static CAudioInput *Create( void );
+
+	// base class needs virtual destructor
+	virtual ~CAudioInput( void ) {}
+
+	// ------------------- interface ------------------------
+
+	// Returns the current count of available samples
+	virtual int SampleCount( void ) = 0;
+	
+	// returns the size of each sample in bytes
+	virtual int SampleSize( void ) = 0;
+	
+	// returns the sampling rate of the data
+	virtual int SampleRate( void ) = 0;
+
+	// returns a pointer to the available data
+	virtual void *SampleData( void ) = 0;
+
+	// release the available data (mark as done)
+	virtual void SampleRelease( void ) = 0;
+
+	// returns the mono/stereo status of this device (true if stereo)
+	virtual bool IsStereo( void ) = 0;
+
+	// begin sampling
+	virtual void Start( void ) = 0;
+
+	// stop sampling
+	virtual void Stop( void ) = 0;
+};
+
+class CAudioSource;
+
+class CAudioOutput
+{
+public:
+	// factory to create a suitable audio output for this system
+	static CAudioOutput *Create( void );
+
+	// base class needs virtual destructor
+	virtual ~CAudioOutput( void ) {}
+
+	// ------------------- interface ------------------------
+
+	// returns the size of each sample in bytes
+	virtual int		SampleSize( void ) = 0;
+	
+	// returns the sampling rate of the data
+	virtual int		SampleRate( void ) = 0;
+
+	// returns the mono/stereo status of this device (true if stereo)
+	virtual bool	IsStereo( void ) = 0;
+
+	// move up to time (time is absolute)
+	virtual void	Update( float dt ) = 0;
+
+	virtual void	Flush( void ) = 0;
+
+	// Hook up a filter to the input channel
+	virtual void	AddSource( CAudioMixer *pSource ) = 0;
+
+	virtual void	StopSounds( void ) = 0;
+
+	virtual void	FreeChannel( int channel ) = 0;
+
+	virtual int		FindSourceIndex( CAudioMixer *pSource ) = 0;
+
+	virtual float	GetAmountofTimeAhead( void ) = 0;
+
+	virtual int		GetNumberofSamplesAhead( void ) = 0;
+
+	virtual CAudioMixer *GetMixerForSource( CAudioSource *pDevice ) = 0;
+};
+
+
+int AudioResample( void *pInput,	int inCount,	int inSize,		bool inStereo,	int inRate,
+				    void *pOutput,	int outCount,	int outSize,	bool outStereo, int outRate );
+
+#endif		// SOUND_H