多媒体编程

开发平台：
Visual C++

RealMediaGraph.cpp：源码内容
							/* 
 *	Copyright (C) 2003-2005 Gabest
 *	http://www.gabest.org
 *
 *  This Program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *   
 *  This Program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *   
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */
#include "stdafx.h"
#include "mplayerc.h"
#include <math.h>
#include <atlbase.h>
#include <atlcoll.h>
#include <initguid.h>
#include "RealMediaGraph.h"
#include "RealMediaWindowlessSite.h"
#include "......includeRealMediarmavsurf.h"
#include "......includeRealMediarmaevent.h"
#include "......includeRealMediarmaprefs.h"
#include "....DSUtilDSUtil.h"
#include "AuthDlg.h"
// CRealMediaPlayer
CRealMediaPlayer::CRealMediaPlayer(HWND hWndParent, CRealMediaGraph* pRMG) 
	: CUnknown(NAME("CRealMediaPlayer"), NULL)
	, m_pRMG(pRMG)
	, m_hWndParent(hWndParent)
	, m_fpCreateEngine(NULL), m_fpCloseEngine(NULL), m_hRealMediaCore(NULL)
	, m_State(State_Stopped), m_UserState(State_Stopped), m_nCurrent(0), m_nDuration(0)
	, m_VideoSize(0, 0)
	, m_fVideoSizeChanged(true)
{
}
CRealMediaPlayer::~CRealMediaPlayer()
{
	Deinit();
}
bool CRealMediaPlayer::Init()
{
	CString prefs(_T("Software\RealNetworks\Preferences"));
	CRegKey key;
	if(ERROR_SUCCESS != key.Open(HKEY_CLASSES_ROOT, prefs + _T("\DT_Common"), KEY_READ))
		return(false);
	TCHAR buff[MAX_PATH];
	ULONG len = sizeof(buff);
	if(ERROR_SUCCESS != key.QueryStringValue(NULL, buff, &len))
		return(false);
	key.Close();
	if(!(m_hRealMediaCore = LoadLibrary(CString(buff) + _T("pnen3260.dll")))) 
		return(false);
	m_fpCreateEngine = (FPRMCREATEENGINE)GetProcAddress(m_hRealMediaCore, "CreateEngine");
	m_fpCloseEngine = (FPRMCLOSEENGINE)GetProcAddress(m_hRealMediaCore, "CloseEngine");
	m_fpSetDLLAccessPath = (FPRMSETDLLACCESSPATH)GetProcAddress(m_hRealMediaCore, "SetDLLAccessPath");
	
	if(!m_fpCreateEngine || !m_fpCloseEngine || !m_fpSetDLLAccessPath)
		return(false);
	if(ERROR_SUCCESS == key.Open(HKEY_CLASSES_ROOT, prefs, KEY_READ))
	{
		CString dllpaths;
		len = sizeof(buff);
		for(int i = 0; ERROR_SUCCESS == key.EnumKey(i, buff, &len); i++, len = sizeof(buff))
		{
			CRegKey key2;
			TCHAR buff2[MAX_PATH];
			ULONG len2 = sizeof(buff2);
			if(ERROR_SUCCESS != key2.Open(HKEY_CLASSES_ROOT, prefs + _T("\") + buff, KEY_READ)
			|| ERROR_SUCCESS != key2.QueryStringValue(NULL, buff2, &len2))
				continue;
			dllpaths += CString(buff) + '=' + buff2 + '|';
		}
		key.Close();
		if(!dllpaths.IsEmpty())
		{
			char* s = new char[dllpaths.GetLength()+1];
			strcpy(s, CStringA(dllpaths));
			for(int i = 0, j = strlen(s); i < j; i++) {if(s[i] == '|') s[i] = '';}
			m_fpSetDLLAccessPath(s);
			delete [] s;
		}
	}
	if(PNR_OK != m_fpCreateEngine(&m_pEngine))
		return(false);
	if(PNR_OK != m_pEngine->CreatePlayer(*&m_pPlayer))
		return(false);
	if(!(m_pSiteManager = m_pPlayer) || !(m_pCommonClassFactory = m_pPlayer))
		return(false);
	m_pAudioPlayer = m_pPlayer;
	m_pAudioPlayer->AddPostMixHook(static_cast<IRMAAudioHook*>(this), FALSE, FALSE);
//	m_pVolume = m_pAudioPlayer->GetDeviceVolume();
	m_pVolume = m_pAudioPlayer->GetAudioVolume();
	// IRMAVolume::SetVolume has a huge latency when used via GetAudioVolume,
	// but by lowering this audio pushdown thing it can get better
	CComQIPtr<IRMAAudioPushdown, &IID_IRMAAudioPushdown> pAP = m_pAudioPlayer;
	if(pAP) pAP->SetAudioPushdown(300); // 100ms makes the playback sound choppy, 200ms looks ok, but for safety we set this to 300ms... :P
	CComQIPtr<IRMAErrorSinkControl, &IID_IRMAErrorSinkControl> pErrorSinkControl = m_pPlayer;
	if(pErrorSinkControl) pErrorSinkControl->AddErrorSink(static_cast<IRMAErrorSink*>(this), PNLOG_EMERG, PNLOG_INFO);
	if(PNR_OK != m_pPlayer->AddAdviseSink(static_cast<IRMAClientAdviseSink*>(this)))
		return(false);
	if(PNR_OK != m_pPlayer->SetClientContext((IUnknown*)(INonDelegatingUnknown*)(this)))
		return(false);
	// TODO
/*
	if(CComQIPtr<IRMAPreferences, &IID_IRMAPreferences> pPrefs = m_pPlayer)
	{
		CComPtr<IRMABuffer> pBuffer;
		HRESULT hr = pPrefs->ReadPref("HTTPProxyHost", *&pBuffer);
		UCHAR* pData = NULL;
		ULONG32 ulLength = 0;
		hr = pBuffer->Get(pData, ulLength);
		pBuffer = NULL;
		hr = m_pCommonClassFactory->CreateInstance(CLSID_IRMABuffer, (void**)&pBuffer);
		hr = pBuffer->SetSize(strlen("localhost")+1);
		pData = pBuffer->GetBuffer();
		strcpy((char*)pData, "localhost");
		hr = pBuffer->Set(pData, strlen("localhost")+1);
		pData = NULL;
		ulLength = 0;
		hr = pBuffer->Get(pData, ulLength);
		hr = pPrefs->WritePref("HTTPProxyHost", pBuffer);
		hr = hr;
	}
*/
	return(true);
}
void CRealMediaPlayer::Deinit()
{
	if(m_pPlayer)
	{
		m_pPlayer->Stop();
		CComQIPtr<IRMAErrorSinkControl, &IID_IRMAErrorSinkControl> pErrorSinkControl = m_pPlayer;
		if(pErrorSinkControl) pErrorSinkControl->RemoveErrorSink(static_cast<IRMAErrorSink*>(this));
		m_pPlayer->RemoveAdviseSink(static_cast<IRMAClientAdviseSink*>(this));
		m_pVolume = NULL;
		m_pAudioPlayer->RemovePostMixHook(static_cast<IRMAAudioHook*>(this));
		m_pAudioPlayer.Release();
		m_pEngine->ClosePlayer(m_pPlayer);
		m_pSiteManager.Release();
		m_pCommonClassFactory.Release();
		m_pPlayer = NULL;
	}
	if(m_pEngine)
	{
		m_fpCloseEngine(m_pEngine);
		m_pEngine = NULL;
	}
	if(m_hRealMediaCore) 
	{
		FreeLibrary(m_hRealMediaCore);
		m_hRealMediaCore = NULL;
	}
}
STDMETHODIMP CRealMediaPlayer::NonDelegatingQueryInterface(REFIID riid, void** ppv)
{
    CheckPointer(ppv, E_POINTER);
	return 
		QI2(IRMAErrorSink)
		QI2(IRMAClientAdviseSink)
		QI2(IRMAAuthenticationManager)
		QI2(IRMASiteSupplier)
		QI2(IRMAPassiveSiteWatcher)
		QI2(IRMAAudioHook)
		__super::NonDelegatingQueryInterface(riid, ppv);
}
// IRMAErrorSink
STDMETHODIMP CRealMediaPlayer::ErrorOccurred(const UINT8 unSeverity, const UINT32 ulRMACode, const UINT32 ulUserCode, const char* pUserString, const char* pMoreInfoURL)
{
	char* errmsg = NULL;
	if(unSeverity < 5)
	{
		if(CComQIPtr<IRMAErrorMessages, &IID_IRMAErrorMessages> pErrorMessages = m_pPlayer)
		{
			CComPtr<IRMABuffer> pBuffer = pErrorMessages->GetErrorText(ulRMACode);
			if(pBuffer)
			{
				char* buff = (char*)pBuffer->GetBuffer();
				int len = strlen(buff);
				if(len > 0 && (errmsg = (char*)CoTaskMemAlloc(len+1)))
					strcpy(errmsg, buff);
			}
		}
		if(!errmsg && (errmsg = (char*)CoTaskMemAlloc(strlen("RealMedia error")+1)))
			strcpy(errmsg, "RealMedia error");		
		m_pRMG->NotifyEvent(EC_BG_ERROR, (LONG_PTR)errmsg, 0);
	}
	return PNR_OK;
}
// IRMAClientAdviseSink
STDMETHODIMP CRealMediaPlayer::OnPosLength(UINT32 ulPosition, UINT32 ulLength)
{
	m_nCurrent = (REFERENCE_TIME)ulPosition*10000;
	m_nDuration = (REFERENCE_TIME)ulLength*10000;
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnPresentationOpened() {return PNR_OK;}
STDMETHODIMP CRealMediaPlayer::OnPresentationClosed() {return PNR_OK;}
STDMETHODIMP CRealMediaPlayer::OnStatisticsChanged() 
{
	m_pRMG->NotifyEvent(EC_LENGTH_CHANGED);	
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnPreSeek(UINT32 ulOldTime, UINT32 ulNewTime)
{
	m_nCurrent = (REFERENCE_TIME)ulNewTime*10000;
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnPostSeek(UINT32 ulOldTime, UINT32 ulNewTime)
{
	m_nCurrent = (REFERENCE_TIME)ulNewTime*10000;
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnStop()
{
	m_nCurrent = 0;
	m_State = State_Stopped;
	if(m_UserState != State_Stopped)
		m_pRMG->NotifyEvent(EC_COMPLETE);
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnPause(UINT32 ulTime)
{
	m_State = State_Paused;
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnBegin(UINT32 ulTime)
{
	m_State = State_Running;
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnBuffering(UINT32 ulFlags, UINT16 unPercentComplete)
{
	m_unPercentComplete = unPercentComplete;
	return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::OnContacting(const char* pHostName) {return PNR_OK;}
// IRMAAuthenticationManager
STDMETHODIMP CRealMediaPlayer::HandleAuthenticationRequest(IRMAAuthenticationManagerResponse* pResponse)
{
	CAuthDlg dlg;
	if(dlg.DoModal() == IDOK)
	{
		pResponse->AuthenticationRequestDone(
			PNR_OK, CStringA(dlg.m_username), CStringA(dlg.m_password));
		return PNR_OK;
	}
	return pResponse->AuthenticationRequestDone(PNR_NOT_AUTHORIZED, NULL, NULL);
}
// IRMASiteSupplier
STDMETHODIMP CRealMediaPlayer::SitesNeeded(UINT32 uRequestID, IRMAValues* pProps)
{
    if(!pProps) return PNR_INVALID_PARAMETER;
	if(m_pTheSite || m_pTheSite2 || !m_hWndParent) return PNR_UNEXPECTED;
	HRESULT hr = PNR_OK;
	if(!CreateSite(&m_pTheSite))
		return E_FAIL;
	ULONG refc = ((IRMASite*)m_pTheSite)->AddRef();
	refc = ((IRMASite*)m_pTheSite)->Release();
	if(!(m_pTheSite2 = m_pTheSite))
		return E_NOINTERFACE;
	CComQIPtr<IRMAValues, &IID_IRMAValues> pSiteProps = m_pTheSite;
    if(!pSiteProps)
		return E_NOINTERFACE;
    IRMABuffer* pValue;
	// no idea what these supposed to do... but they were in the example
    hr = pProps->GetPropertyCString("playto", pValue);
    if(PNR_OK == hr)
    {
		pSiteProps->SetPropertyCString("channel", pValue);
		pValue->Release();
    }
    else
    {
		hr = pProps->GetPropertyCString("name", pValue);
		if(PNR_OK == hr)
		{
			pSiteProps->SetPropertyCString("LayoutGroup", pValue);
			pValue->Release();
		}
    }
    m_pTheSite2->AddPassiveSiteWatcher(static_cast<IRMAPassiveSiteWatcher*>(this));
    hr = m_pSiteManager->AddSite(m_pTheSite);
    if(PNR_OK != hr)
		return hr;
    m_CreatedSites[uRequestID] = m_pTheSite;
    return hr;
}
STDMETHODIMP CRealMediaPlayer::SitesNotNeeded(UINT32 uRequestID)
{
    IRMASite* pSite;
	if(!m_CreatedSites.Lookup(uRequestID, pSite))
		return PNR_INVALID_PARAMETER;
	m_CreatedSites.RemoveKey(uRequestID);
    m_pSiteManager->RemoveSite(pSite);
    m_pTheSite2->RemovePassiveSiteWatcher(static_cast<IRMAPassiveSiteWatcher*>(this));
	m_pTheSite.Release();
	m_pTheSite2.Release();
	DestroySite(pSite);
    return PNR_OK;
}
STDMETHODIMP CRealMediaPlayer::BeginChangeLayout() {return E_NOTIMPL;}
STDMETHODIMP CRealMediaPlayer::DoneChangeLayout()
{
	if(m_fVideoSizeChanged)
	{
        m_pRMG->NotifyEvent(EC_VIDEO_SIZE_CHANGED, MAKELPARAM(m_VideoSize.cx, m_VideoSize.cy), 0);
		m_fVideoSizeChanged = false;
	}
	return PNR_OK;
}
// IRMAPassiveSiteWatcher
STDMETHODIMP CRealMediaPlayer::PositionChanged(PNxPoint* pos) {return E_NOTIMPL;}
STDMETHODIMP CRealMediaPlayer::SizeChanged(PNxSize* size)
{
	if(m_VideoSize.cx == 0 || m_VideoSize.cy == 0)
	{
		m_fVideoSizeChanged = true;
		m_VideoSize.cx = size->cx;
		m_VideoSize.cy = size->cy;
	}
	return PNR_OK;
}
// IRMAAudioHook
STDMETHODIMP CRealMediaPlayer::OnBuffer(RMAAudioData* pAudioInData, RMAAudioData* pAudioOutData) {return E_NOTIMPL;}
STDMETHODIMP CRealMediaPlayer::OnInit(RMAAudioFormat* pFormat)
{
	m_pRMG->NotifyEvent(EC_BG_AUDIO_CHANGED, pFormat->uChannels, 0);
	return PNR_OK;
}
//
// CRealMediaPlayerWindowed
//
CRealMediaPlayerWindowed::CRealMediaPlayerWindowed(HWND hWndParent, CRealMediaGraph* pRMG) 
	: CRealMediaPlayer(hWndParent, pRMG) 
{
	if(!m_wndWindowFrame.CreateEx(WS_EX_NOPARENTNOTIFY, NULL, NULL, WS_CHILD|WS_VISIBLE|WS_CLIPSIBLINGS|WS_CLIPCHILDREN|WS_VISIBLE,
		CRect(0, 0, 0, 0), CWnd::FromHandle(m_hWndParent), 0, NULL))
		return;
	if(!m_wndDestFrame.Create(NULL, NULL, WS_CHILD|WS_VISIBLE|WS_CLIPSIBLINGS|WS_CLIPCHILDREN,
		CRect(0, 0, 0, 0), &m_wndWindowFrame, 0, NULL))
		return;
}
CRealMediaPlayerWindowed::~CRealMediaPlayerWindowed()
{
	m_wndDestFrame.DestroyWindow();
	m_wndWindowFrame.DestroyWindow();
}
void CRealMediaPlayerWindowed::SetWindowRect(CRect r)
{
	if(IsWindow(m_wndWindowFrame.m_hWnd))
		m_wndWindowFrame.MoveWindow(r);
}
void CRealMediaPlayerWindowed::SetDestRect(CRect r)
{
	if(IsWindow(m_wndDestFrame.m_hWnd))
		m_wndDestFrame.MoveWindow(r);
	if(m_pTheSite)
	{
		PNxSize s = {r.Width(), r.Height()};
		m_pTheSite->SetSize(s);
	}
}
bool CRealMediaPlayerWindowed::CreateSite(IRMASite** ppSite)
{
	if(!ppSite)
		return(false);
    CComPtr<IRMASiteWindowed> pSiteWindowed;
    if(PNR_OK != m_pCommonClassFactory->CreateInstance(CLSID_IRMASiteWindowed, (void**)&pSiteWindowed))
		return(false);
	DWORD style = WS_CHILD|WS_VISIBLE|WS_CLIPSIBLINGS|WS_CLIPCHILDREN;
	if(!AfxGetAppSettings().fIntRealMedia) style |= WS_DISABLED;
    if(PNR_OK != pSiteWindowed->Create(m_wndDestFrame.m_hWnd, style))
		return(false);
	return !!(*ppSite = CComQIPtr<IRMASite, &IID_IRMASite>(pSiteWindowed).Detach());
}
void CRealMediaPlayerWindowed::DestroySite(IRMASite* pSite)
{
	if(CComQIPtr<IRMASiteWindowed, &IID_IRMASiteWindowed> pRMASiteWindowed = pSite)
		pRMASiteWindowed->Destroy();
}
//
// CRealMediaPlayerWindowless
//
CRealMediaPlayerWindowless::CRealMediaPlayerWindowless(HWND hWndParent, CRealMediaGraph* pRMG) 
	: CRealMediaPlayer(hWndParent, pRMG) 
{
	AppSettings& s = AfxGetAppSettings();
	switch(s.iRMVideoRendererType)
	{
	default:
	case VIDRNDT_RM_DX7:
		if(FAILED(CreateAP7(CLSID_RM7AllocatorPresenter, hWndParent, &m_pRMAP)))
			return;
		break;
	case VIDRNDT_RM_DX9:
		if(FAILED(CreateAP9(CLSID_RM9AllocatorPresenter, hWndParent, &m_pRMAP)))
			return;
		break;
	}
}
CRealMediaPlayerWindowless::~CRealMediaPlayerWindowless()
{
}
STDMETHODIMP CRealMediaPlayerWindowless::NonDelegatingQueryInterface(REFIID riid, void** ppv)
{
    CheckPointer(ppv, E_POINTER);
	return 
		(m_pRMAP && (riid == __uuidof(ISubPicAllocatorPresenter) || riid == IID_IRMAVideoSurface)) ? m_pRMAP->QueryInterface(riid, ppv) : 
		__super::NonDelegatingQueryInterface(riid, ppv);
}
bool CRealMediaPlayerWindowless::CreateSite(IRMASite** ppSite)
{
	if(!ppSite || !m_pRMAP)
		return(false);
	HRESULT hr = S_OK;
	CRealMediaWindowlessSite* pWMWlS;
    CComPtr<IRMASiteWindowless> pSiteWindowless;
	pSiteWindowless = (IRMASiteWindowless*)(pWMWlS = new CRealMediaWindowlessSite(hr, m_pPlayer, NULL, NULL));
    if(FAILED(hr))
		return(false);
	pWMWlS->SetBltService(CComQIPtr<IRMAVideoSurface, &IID_IRMAVideoSurface>(m_pRMAP));
	return !!(*ppSite = CComQIPtr<IRMASite, &IID_IRMASite>(pSiteWindowless).Detach());
}
void CRealMediaPlayerWindowless::DestroySite(IRMASite* pSite)
{
}
STDMETHODIMP CRealMediaPlayerWindowless::SizeChanged(PNxSize* size)
{
	if(CComQIPtr<IRMAVideoSurface, &IID_IRMAVideoSurface> pRMAVS = m_pRMAP)
	{
		RMABitmapInfoHeader BitmapInfo;
		memset(&BitmapInfo, 0, sizeof(BitmapInfo));
		BitmapInfo.biWidth = size->cx;
		BitmapInfo.biHeight = size->cy;
		pRMAVS->BeginOptimizedBlt(&BitmapInfo);
	}
	return __super::SizeChanged(size);
}
////////////////
CRealMediaGraph::CRealMediaGraph(HWND hWndParent, HRESULT& hr)
	: CBaseGraph()
{
	hr = S_OK;
	m_pRMP = AfxGetAppSettings().iRMVideoRendererType == VIDRNDT_RM_DEFAULT
		? (CRealMediaPlayer*)new CRealMediaPlayerWindowed(hWndParent, this)
		: (CRealMediaPlayer*)new CRealMediaPlayerWindowless(hWndParent, this);
	if(!m_pRMP)
	{
		hr = E_OUTOFMEMORY;
		return;
	}
	if(!m_pRMP->Init())
	{
		delete m_pRMP, m_pRMP = NULL;
		hr = E_FAIL;
		return;
	}
	m_pRMP->AddRef();
}
CRealMediaGraph::~CRealMediaGraph()
{
	if(m_pRMP)
	{
		m_pRMP->Deinit();
		m_pRMP->Release();
		m_pRMP = NULL;
	}
}
STDMETHODIMP CRealMediaGraph::NonDelegatingQueryInterface(REFIID riid, void** ppv)
{
    CheckPointer(ppv, E_POINTER);
	return 
		(m_pRMP && (riid == __uuidof(ISubPicAllocatorPresenter) || riid == __uuidof(ISubPicAllocatorPresenter))) ? m_pRMP->QueryInterface(riid, ppv) : 
		__super::NonDelegatingQueryInterface(riid, ppv);
}
// IGraphBuilder
STDMETHODIMP CRealMediaGraph::RenderFile(LPCWSTR lpcwstrFile, LPCWSTR lpcwstrPlayList)
{
	CHAR buff[MAX_PATH] = {0};
	WideCharToMultiByte(GetACP(), 0, lpcwstrFile, -1, buff, MAX_PATH, 0, 0);
	CStringA fn(buff);
	if(fn.Find("://") < 0) fn = "file://" + fn;
	m_pRMP->m_unPercentComplete = 100;
	ClearMessageQueue();
	if(PNR_OK != m_pRMP->m_pPlayer->OpenURL(fn)) 
		return E_FAIL;
	m_pRMP->m_pPlayer->Pause()/*Stop()*/; // please, don't start just yet
	return S_OK;
}
// IMediaControl
STDMETHODIMP CRealMediaGraph::Run()
{
	m_pRMP->m_UserState = State_Running;
	return (PNR_OK == m_pRMP->m_pPlayer->Begin()) ? S_OK : E_FAIL;
}
STDMETHODIMP CRealMediaGraph::Pause()
{
	m_pRMP->m_UserState = State_Paused;
	return (PNR_OK == m_pRMP->m_pPlayer->Pause()) ? S_OK : E_FAIL;
}
STDMETHODIMP CRealMediaGraph::Stop()
{
	m_pRMP->m_UserState = State_Stopped;
	return (PNR_OK == m_pRMP->m_pPlayer->Stop()) ? S_OK : E_FAIL;
}
STDMETHODIMP CRealMediaGraph::GetState(LONG msTimeout, OAFilterState* pfs)
{
	return pfs ? *pfs = m_pRMP->m_State, S_OK : E_POINTER;
}
// IMediaSeeking
STDMETHODIMP CRealMediaGraph::GetDuration(LONGLONG* pDuration)
{
	return pDuration ? *pDuration = m_pRMP->m_nDuration, S_OK : E_POINTER;
}
STDMETHODIMP CRealMediaGraph::GetCurrentPosition(LONGLONG* pCurrent)
{
	return pCurrent ? *pCurrent = m_pRMP->m_nCurrent, S_OK : E_POINTER;
}
STDMETHODIMP CRealMediaGraph::SetPositions(LONGLONG* pCurrent, DWORD dwCurrentFlags, LONGLONG* pStop, DWORD dwStopFlags)
{
	return (dwCurrentFlags&AM_SEEKING_AbsolutePositioning) 
		&& (PNR_OK == m_pRMP->m_pPlayer->Seek((ULONG)(*pCurrent / 10000))) ? S_OK : E_FAIL;
}
// IVideoWindow
STDMETHODIMP CRealMediaGraph::SetWindowPosition(long Left, long Top, long Width, long Height)
{
	if(m_pRMP)
		m_pRMP->SetWindowRect(CRect(CPoint(Left, Top), CSize(Width, Height)));
	return S_OK;
}
// IBasicVideo
STDMETHODIMP CRealMediaGraph::SetDestinationPosition(long Left, long Top, long Width, long Height)// {return E_NOTIMPL;}
{
	m_pRMP->SetDestRect(CRect(CPoint(Left, Top), CSize(Width, Height)));
	return S_OK;
}
STDMETHODIMP CRealMediaGraph::GetVideoSize(long* pWidth, long* pHeight)
{
	if(!pWidth || !pHeight) return E_POINTER;
	*pWidth = m_pRMP->GetVideoSize().cx;
	*pHeight = m_pRMP->GetVideoSize().cy;
	return S_OK;
}
// IBasicAudio
STDMETHODIMP CRealMediaGraph::put_Volume(long lVolume)
{
	if(!m_pRMP->m_pVolume) return E_UNEXPECTED;
	UINT16 volume = (lVolume == -10000) ? 0 : (int)pow(10.0, ((double)lVolume)/5000+2);
	volume = max(min(volume, 100), 0);
	return PNR_OK == m_pRMP->m_pVolume->SetVolume(volume) ? S_OK : E_FAIL;
}
STDMETHODIMP CRealMediaGraph::get_Volume(long* plVolume)
{
	if(!m_pRMP->m_pVolume) return E_UNEXPECTED;
	CheckPointer(plVolume, E_POINTER);
	UINT16 volume = m_pRMP->m_pVolume->GetVolume();
	volume = (int)((log10(1.0*volume)-2)*5000);
	volume = max(min(volume, 0), -10000);
	*plVolume = volume;
	return S_OK;
}
// IAMOpenProgress
STDMETHODIMP CRealMediaGraph::QueryProgress(LONGLONG* pllTotal, LONGLONG* pllCurrent)
{
	*pllTotal = 100;
	*pllCurrent = m_pRMP->m_unPercentComplete > 0 ? m_pRMP->m_unPercentComplete : 100; // after seeking it drops to 0 and would show annoying "Buffering... (0%)" messages on the status line
	return S_OK;
}
// IGraphEngine
STDMETHODIMP_(engine_t) CRealMediaGraph::GetEngine() {return RealMedia;}

						