//========= Copyright Valve Corporation, All rights reserved. ============//

//

// Purpose:

//

//===========================================================================//

#ifndef ISOUNDSYSTEM_H

#define ISOUNDSYSTEM_H

#ifdef _WIN32

#pragma once

#endif

#include "appframework/iappsystem.h"

//-----------------------------------------------------------------------------

// Forward declarations

//-----------------------------------------------------------------------------

class IAudioDevice;

class CAudioSource;

class CAudioMixer;

//-----------------------------------------------------------------------------

// Sound handle

//-----------------------------------------------------------------------------

typedef unsigned short AudioSourceHandle_t;

enum

{

AUDIOSOURCEHANDLE_INVALID = (AudioSourceHandle_t)~0

};

//-----------------------------------------------------------------------------

// Flags for FindAudioSource

//-----------------------------------------------------------------------------

enum FindAudioSourceFlags_t

};

//-----------------------------------------------------------------------------

// Purpose: DLL interface for low-level sound utilities

//-----------------------------------------------------------------------------

#define SOUNDSYSTEM_INTERFACE_VERSION "SoundSystem001"

abstract_class ISoundSystem : public IAppSystem

{

public:

virtual void Update( float time ) = 0;

virtual void Flush( void ) = 0;

virtual CAudioSource *FindOrAddSound( const char *filename ) = 0;

virtual CAudioSource *LoadSound( const char *wavfile ) = 0;

virtual void PlaySound( CAudioSource *source, float volume, CAudioMixer **ppMixer ) = 0;

virtual bool IsSoundPlaying( CAudioMixer *pMixer ) = 0;

virtual CAudioMixer *FindMixer( CAudioSource *source ) = 0;

virtual void StopAll( void ) = 0;

virtual void StopSound( CAudioMixer *mixer ) = 0;

};

#endif // ISOUNDSYSTEM_H