mediacontrol.cpp

WINCE下媒体播放器源代码

#include "StdAfx.h"
#include "MediaControl.h"

CMediaControl::CMediaControl(void)
{
	//DSHOW init
	m_pGB=NULL;
	m_pMC=NULL;
	m_pME=NULL;
	m_pVW=NULL;
	m_pBA=NULL;
	m_pBV=NULL;
	m_pMS=NULL;

	//COM init
	CoInitialize(NULL);
}

CMediaControl::~CMediaControl(void)
{
	UnInitDShow();
	CoUninitialize();
}

BOOL CMediaControl::InitDShow(LPCTSTR strFileName,//视频文件名
		HWND hOwnerWnd,//显示视频的窗口句柄
		HWND hNotifyWnd)//接收DSHOW事件的串口句柄
{
	HRESULT hResult;
	//第一步，创建IGraphBuilder接口
	hResult = CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC,
		IID_IGraphBuilder,(void **)&m_pGB);
	if(hResult != S_OK)
	{
		return FALSE;
	}
	//第二步，利用IGraphBuilder渲染视频文件
	hResult = m_pGB->RenderFile(strFileName,NULL);
	if(hResult != S_OK)
	{
		if(hResult == VFW_S_PARTIAL_RENDER)
		{
			TRACE(L"Some of the streams in this movie are in an unsupported format.\n");
		}
		else if(hResult == VFW_S_AUDIO_NOT_RENDERED)
		{
			TRACE(L"Partial success;the audio was not rendered.\n");
		}
		else if(hResult == VFW_S_DUPLICATE_NAME)
		{
			TRACE(L"Success;the Filter Graph Manager modified the filter name to avoid duplication..\n");
		}
		else if(hResult == VFW_VIDEO_NOT_RENDERED)
		{
			TRACE(L"Partial success;Some of the streams in this movie are in an unsupported format.\n");
		}
		else
		{
			UnInitDShow();
			return FALSE;
		}
	}
	//第三步，得到媒体播放控制接口
	hResult = m_pGB->QueryInterface(IID_IMediaControl,(void **)&m_pMC);
	if(hResult != S_OK)
	{
		UnInitDShow();
		return FALSE;
	}
	//第四步，得到媒体播放位置搜索接口
	hResult = m_pGB->QueryInterface(IID_IMediaSeeking,(void **)&m_pMS);
	if(hResult != S_OK)
	{
		UnInitDShow();
		return FALSE;
	}
	//设置查找定位的时间单位，这里设置：100纳秒（十亿分之一）
	GUID guid_timeFormat = TIME_FORMAT_MEDIA_TIME;
	m_pMS->SetTimeFormat(&guid_timeFormat);
	//第五步，得到媒体播放事件接口
	hResult = m_pGB->QueryInterface(IID_IMediaEventEx,(void **)&m_pME);
	if(hResult != S_OK)
	{
		UnInitDShow();
		return FALSE;
	}
	//设置媒体事件通知消息窗口
	m_pME->SetNotifyWindow((OAHWND)hNotifyWnd,WM_GRAPHNOTIFY,0);
	//第六步，得到视频播放窗口接口
	hResult = m_pGB->QueryInterface(IID_IVideoWindow,(void **)&m_pVW);
	if(hResult != S_OK)
	{
		UnInitDShow();
		return FALSE;
	}
	m_pVW->put_Owner((OAHWND)hOwnerWnd);//设置视频窗口句柄
	m_pVW->put_WindowStyle(WS_CHILD|WS_CLIPSIBLINGS|WS_CLIPCHILDREN);
	//第七步，得到基础视频流接口
	hResult = m_pGB->QueryInterface(IID_IBasicVideo,(void **)&m_pBV);
	if(hResult != S_OK)
	{
		UnInitDShow();
		return FALSE;
	}
	//第八步，得到基础音频流接口
	hResult = m_pGB->QueryInterface(IID_IBasicAudio,(void **)&m_pBA);
	if(hResult != S_OK)
	{
		UnInitDShow();
		return FALSE;
	}

	return TRUE;


}

	BOOL CMediaControl::UnInitDShow()
	{//1
		if(m_pMC != NULL)
		{
			m_pMC->Stop();
			m_pMC->Release();
			m_pMC = NULL;
		}
//2
		if(m_pME != NULL)
		{
			m_pME->SetNotifyWindow(NULL,0,0);
			m_pME->Release();
			m_pME = NULL;
		}
//3
		if(m_pVW != NULL)
		{
			m_pVW->put_Visible(OAFALSE);
			m_pVW->put_Owner(NULL);
			m_pVW->Release();
			m_pVW = NULL;
		}
//4
		if(m_pBA != NULL)
		{
			
			m_pBA->Release();
			m_pBA = NULL;
		}
//5
		if(m_pBV != NULL)
		{
			
			m_pBV->Release();
			m_pBV = NULL;
		}
//6
		if(m_pMS != NULL)
		{
			
			m_pMS->Release();
			m_pMS = NULL;
		}
//7
		if(m_pGB != NULL)
		{
			
			m_pGB->Release();
			m_pGB = NULL;
		}

		return TRUE;
	}

	BOOL CMediaControl::OpenFile(LPCTSTR strFileName,HWND hOwnerWnd,HWND hNotifyWnd)
	{
		//存储显示视频窗口句柄
		m_hOwnerWnd = hOwnerWnd;
		//重置DShow接口
		UnInitDShow();
		//打开视频文件，并对DShow接口做初始化
		return InitDShow(strFileName,hOwnerWnd,hNotifyWnd);
	}
	BOOL CMediaControl::VideoRun()
	{
		//检测IMediaControl接口有效性
		if(m_pMC == NULL)
		{
			return FALSE;
		}
		//播放视频
		HRESULT hResult = m_pMC->Run();
		if(hResult != S_OK)
		{
			return FALSE;
		}
		return TRUE;
	}
	BOOL CMediaControl::VideoPause()
	{
		if(m_pMC == NULL)
		{
			return FALSE;
		}
		//播放视频
		HRESULT hResult = m_pMC->Pause();
		if(hResult != S_OK)
		{
			return FALSE;
		}
		return TRUE;
	}
	BOOL CMediaControl::VideoStop()
	{
		if(m_pMC == NULL)
		{
			return FALSE;
		}
		//播放视频
		HRESULT hResult = m_pMC->Stop();
		if(hResult != S_OK)
		{
			return FALSE;
		}
		//将当前播放位置置0
		LONGLONG pos=0;
		hResult = m_pMS->SetPositions(&pos,AM_SEEKING_AbsolutePositioning,
			NULL,AM_SEEKING_NoPositioning);
		return TRUE;
	}


//设置视频显示比例
	BOOL CMediaControl::FitVideoWindow(FLOAT fScale)
	{
		LONG lHeight,lWidth;
		int iSeek = 0;
		double dblScaleX,dblScaleY;
		HRESULT hr = S_OK;
		LONG lDeflateX = 0;
		LONG lDeflateY = 0;
		CRect clientRect;
		CRect dstRect;
		if(m_pBV == NULL)
		{
			return FALSE;
		}
		if(fScale>1.0)
		{
			return FALSE;
		}
		//得到原始视频尺寸
		hr = m_pBV->GetVideoSize(&lHeight,&lWidth);
		if(hr != S_OK)
		{
		return FALSE;
		}
		//设置拉伸后的尺寸
		lHeight = lHeight*fScale;
		lWidth = lWidth*fScale;
		//得到视频播放窗口的尺寸
		GetClientRect(m_hOwnerWnd,&clientRect);
		lDeflateX = (clientRect.Width()-clientRect.Width()*fScale)/2;
		lDeflateY = (clientRect.Height()-clientRect.Height()*fScale)/2;
		//重新设置客户区域
		clientRect.DeflateRect(lDeflateX,lDeflateY);

		if((lWidth <= clientRect.Width())&&(lHeight<=clientRect.Height()))
		{
			dstRect.left=(clientRect.right-clientRect.left-lWidth)/2;
			dstRect.right=dstRect.left+lWidth;
			dstRect.top=(clientRect.bottom-clientRect.top-lHeight)/2;
			dstRect.bottom=dstRect.top+lHeight;
		}
		else
		{
			dblScaleX = double(clientRect.Width())/double(lWidth);
			dblScaleY = double(clientRect.Height())/double(lHeight);

			if(dblScaleX<=dblScaleY)
			{
				dstRect.left=clientRect.left;
				dstRect.right=clientRect.right;

				iSeek =(clientRect.Height()-clientRect.Width()*(double(lHeight)/double(lWidth)))/2;
				dstRect.top=clientRect.top+iSeek;
				dstRect.bottom=dstRect.top+clientRect.Width()*(double(lHeight)/double(lWidth));
			}
			else
			{
				dstRect.top=clientRect.top;
				dstRect.bottom=clientRect.bottom;

				iSeek=(clientRect.Width()-clientRect.Height()*(double(lWidth)/double(lHeight)))/2;
				dstRect.left=clientRect.left+iSeek;
				dstRect.right=dstRect.left+clientRect.Height()*(double(lWidth)/double(lHeight));
				
			}
		}
		//设置视频播放位置
		m_pVW->SetWindowPosition(dstRect.left,dstRect.top,dstRect.Width(),dstRect.Height());
		return true;

	}

	//全屏显示
	BOOL CMediaControl::FullScreen()
	{
		LONG lMode=0;
		static HWND hDrain=0;
		if(m_pBV==NULL)
		{
			return FALSE;
		}
		//得到全屏状态
		m_pVW->get_FullScreenMode(&lMode);

		if(lMode == OAFALSE)
		{
			//save current message drain
			m_pVW->get_MessageDrain((OAHWND *)&hDrain);
			//set message drain to application main window
			m_pVW->put_MessageDrain((OAHWND)m_hOwnerWnd);
			//设置全屏
			lMode = OATRUE;
			m_pVW->put_FullScreenMode(lMode);
		}
		else
		{
			//切换到非全屏模式
			lMode = OAFALSE;
			m_pVW->put_FullScreenMode(lMode);

			//undo change of message drain
			m_pVW->put_MessageDrain((OAHWND )hDrain);
			//reset video window
			FitVideoWindow(1);
			m_pVW->SetWindowForeground(-1);
		}
		return TRUE;
	}

	//得到是否全屏播放
	BOOL CMediaControl::GetFullScreenStatus()
	{
		LONG lMode=0;
		if(m_pBV==NULL)
		{
			return FALSE;
		}
		m_pVW->get_FullScreenMode(&lMode);

		if(lMode == OAFALSE)
		{
			return FALSE;
		}
		else
		{
			return TRUE;
		}

	}

	//得到媒体事件
	BOOL CMediaControl::GetMediaEvent(long *lEventCode)
	BOOL CMediaControl::SetPositions(DWORD dwPos)
	BOOL CMediaControl::GetCurrentPos(DWORD &dwPos)
	BOOL CMediaControl::GetDuration(DWORD &dwLength)