echotool.h

VC++视频开发实例集锦(包括“远程视频监控”"语音识别系统"等13个经典例子)

#ifndef _ECHOTOOL_H
#define _ECHOTOOL_H

#include <dmusici.h>


#define MAX_ECHOES	4

class CEchoTool : public IDirectMusicTool
{
public:
	CEchoTool();
    ~CEchoTool();

public:
    virtual STDMETHODIMP QueryInterface(const IID &iid, void **ppv);
    virtual STDMETHODIMP_(ULONG) AddRef();
    virtual STDMETHODIMP_(ULONG) Release();

	HRESULT STDMETHODCALLTYPE Init( IDirectMusicGraph* pGraph );
	HRESULT STDMETHODCALLTYPE GetMsgDeliveryType( DWORD* pdwDeliveryType );
	HRESULT STDMETHODCALLTYPE GetMediaTypeArraySize( DWORD* pdwNumElements );
	HRESULT STDMETHODCALLTYPE GetMediaTypes( DWORD** padwMediaTypes, DWORD dwNumElements) ;
	HRESULT STDMETHODCALLTYPE ProcessPMsg( IDirectMusicPerformance* pPerf, DMUS_PMSG* pDMUS_PMSG );
	HRESULT STDMETHODCALLTYPE Flush( IDirectMusicPerformance* pPerf, DMUS_PMSG* pDMUS_PMSG, REFERENCE_TIME rt );
private:
	long	m_cRef;			    
	DWORD	m_dwEchoNum;	    
	MUSIC_TIME	m_mtDelay;	   
	CRITICAL_SECTION m_CrSec;	

public:

	void	SetEchoNum( DWORD dwEchoNum );
	void	SetDelay( MUSIC_TIME mtDelay );
};

#endif // _ECHOTOOL_H