www.pudn.com > MPlayer0623.zip > VolumeOutWave.h

// VolumeOutWave.h : Module interface declaration. 
// IVolume implementation for wave audio output device 
// Developer : Alex Chmut 
// Created : 8/11/98 
#pragma once 
#include "IVolume.h" 
 
/////////////////////////////////////////////////////////////////////////////////////////////// 
class CVolumeOutWave 
	: public IVolume 
{ 
 
//////////////////////// 
// IVolume interface 
public: 
	virtual bool	IsAvailable(); 
	virtual void	Enable(); 
	virtual void	Disable(); 
	virtual DWORD	GetVolumeMetric(); 
	virtual DWORD	GetMinimalVolume(); 
	virtual DWORD	GetMaximalVolume(); 
	virtual DWORD	GetCurrentVolume(); 
	virtual void	SetCurrentVolume( DWORD dwValue ); 
	virtual void	RegisterNotificationSink( PONMICVOULUMECHANGE, DWORD ); 
 
public: 
	CVolumeOutWave(); 
	~CVolumeOutWave(); 
 
private: 
	bool	Init(); 
	void	Done(); 
 
	bool	Initialize(); 
	void	EnableLine( bool bEnable = true ); 
 
private: 
	// Status Info 
	bool	m_bOK; 
	bool	m_bInitialized; 
	bool	m_bAvailable; 
 
	// Mixer Info 
	UINT	m_uMixerID; 
	DWORD	m_dwMixerHandle; 
 
	DWORD	m_dwLineID; 
	DWORD	m_dwVolumeControlID; 
	int		m_nChannelCount; 
	 
	HWND	m_hWnd; 
	static	LRESULT CALLBACK MixerWndProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ); 
	void	OnControlChanged( DWORD dwControlID ); 
 
	DWORD	m_dwMinimalVolume; 
	DWORD	m_dwMaximalVolume; 
	DWORD	m_dwVolumeStep; 
 
	// User Info 
	PONMICVOULUMECHANGE		m_pfUserSink; 
	DWORD					m_dwUserValue; 
}; 
 
typedef	CVolumeOutWave*	PCVolumeOutWave; 
///////////////////////////////////////////////////////////////////////////////////////////////