Media Player Classic - HC 源代码分析 2：核心类（CMainFrame）（1）

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Media Player Classic - HC 源代码分析系列文章列表：

Media Player Classic - HC 源代码分析 1：整体结构

Media Player Classic - HC 源代码分析 3：核心类（CMainFrame）（2）

Media Player Classic - HC 源代码分析 4：核心类（CMainFrame）（3）

Media Player Classic - HC 源代码分析 5：关于对话框（CAboutDlg）

Media Player Classic - HC 源代码分析 6：MediaInfo选项卡（CPPageFileMediaInfo）

Media Player Classic - HC 源代码分析 7：详细信息选项卡（CPPageFileInfoDetails）

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上一篇文章概括性的介绍了Media Player Classic - Home Cinema (mpc-hc)播放器的源代码：Media Player Classic - HC 源代码分析 1：整体结构
现在可以开始看看具体的源代码了。

mpc-hc最核心的类名字叫CMainFrame，它的定义位于MainFrm.h文件中

CMainFrame定义非常的长，包含了视频播放器的方方面面，一共900多行，在这里应该快放不下了。因此我删掉了很多代码，只保留了部分代码。关键的函数上面都写上了注释。

class CMainFrame : public CFrameWnd, public CDropTarget
{...// TODO: wrap these graph objects into a class to make it look cleaner//各种DirectShow接口//CComPtr被称为智能指针，是ATL提供的一个模版类，能够从语法上自动完成COM的AddRef和Release。CComPtr<IGraphBuilder2> m_pGB;CComQIPtr<IMediaControl> m_pMC;CComQIPtr<IMediaEventEx> m_pME;CComQIPtr<IVideoWindow> m_pVW;//这里也可以获得//分辨率，比特率，帧率//经过测试，貌似这里取不到值 = =CComQIPtr<IBasicVideo> m_pBV;//音量，均衡器等信息CComQIPtr<IBasicAudio> m_pBA;CComQIPtr<IMediaSeeking> m_pMS;CComQIPtr<IVideoFrameStep> m_pFS;//接收端质量信息：抖动，抖动，视音频同步情况等。。。CComQIPtr<IQualProp, &IID_IQualProp> m_pQP;//缓存信息CComQIPtr<IBufferInfo> m_pBI;CComQIPtr<IAMOpenProgress> m_pAMOP;CComPtr<IVMRMixerControl9> m_pVMRMC;CComPtr<IMFVideoDisplayControl> m_pMFVDC;CComPtr<IMFVideoProcessor> m_pMFVP;CComPtr<IVMRWindowlessControl9> m_pVMRWC;...void SetVolumeBoost(UINT nAudioBoost);void SetBalance(int balance);// subtitlesCCritSec m_csSubLock;CList<SubtitleInput> m_pSubStreams;POSITION m_posFirstExtSub;ISubStream* m_pCurrentSubStream;SubtitleInput* GetSubtitleInput(int& i, bool bIsOffset = false);friend class CTextPassThruFilter;// windowingCRect m_lastWindowRect;CPoint m_lastMouseMove;void ShowControls(int nCS, bool fSave = false);void SetUIPreset(int iCaptionMenuMode, UINT nCS);void SetDefaultWindowRect(int iMonitor = 0);void SetDefaultFullscreenState();void RestoreDefaultWindowRect();void ZoomVideoWindow(bool snap = true, double scale = ZOOM_DEFAULT_LEVEL);double GetZoomAutoFitScale(bool bLargerOnly = false) const;void SetAlwaysOnTop(int iOnTop);// dynamic menus// 动态菜单void SetupOpenCDSubMenu();void SetupFiltersSubMenu();void SetupAudioSwitcherSubMenu();void SetupSubtitlesSubMenu();...CMenu m_popupmain, m_popup;CMenu m_opencds;CMenu m_filters, m_subtitles, m_audios;CMenu m_language;...// chapters (file mode)CComPtr<IDSMChapterBag> m_pCB;void SetupChapters();// chapters (dvd mode)void SetupDVDChapters();void SetupIViAudReg();void AddTextPassThruFilter();int m_nLoops;UINT m_nLastSkipDirection;bool m_fCustomGraph;...public:void StartWebServer(int nPort);void StopWebServer();CString GetStatusMessage() const;int GetPlaybackMode() const { return m_iPlaybackMode; }void SetPlaybackMode(int iNewStatus);bool IsMuted() { return m_wndToolBar.GetVolume() == -10000; }int GetVolume() { return m_wndToolBar.m_volctrl.GetPos(); }public:CMainFrame();DECLARE_DYNAMIC(CMainFrame)// Attributes
public:bool m_fFullScreen;bool m_fFirstFSAfterLaunchOnFS;bool m_fStartInD3DFullscreen;bool m_fHideCursor;CMenu m_navaudio, m_navsubtitle;CComPtr<IBaseFilter> m_pRefClock; // Adjustable reference clock. GothSyncCComPtr<ISyncClock> m_pSyncClock;...CControlBar* m_pLastBar;protected:MPC_LOADSTATE m_iMediaLoadState;bool m_bFirstPlay;bool m_fAudioOnly;dispmode m_dmBeforeFullscreen;CString m_LastOpenFile, m_LastOpenBDPath;HMONITOR m_LastWindow_HM;DVD_DOMAIN m_iDVDDomain;DWORD m_iDVDTitle;double m_dSpeedRate;double m_ZoomX, m_ZoomY, m_PosX, m_PosY;int m_AngleX, m_AngleY, m_AngleZ;//操作 Operations//打开一个媒体bool OpenMediaPrivate(CAutoPtr<OpenMediaData> pOMD);//关闭媒体void CloseMediaPrivate();void DoTunerScan(TunerScanData* pTSD);CWnd* GetModalParent();void OpenCreateGraphObject(OpenMediaData* pOMD);//打开文件void OpenFile(OpenFileData* pOFD);//打开DVDvoid OpenDVD(OpenDVDData* pODD);//打开摄像头void OpenCapture(OpenDeviceData* pODD);HRESULT OpenBDAGraph();void OpenCustomizeGraph();//设置视频窗口void OpenSetupVideo();//设置音量void OpenSetupAudio();void OpenSetupInfoBar();void UpdateChapterInInfoBar();//打开统计工具条void OpenSetupStatsBar();//打开状态工具条void OpenSetupStatusBar();// void OpenSetupToolBar();void OpenSetupCaptureBar();//设置窗口标题void OpenSetupWindowTitle(CString fn = _T(""));void AutoChangeMonitorMode();bool GraphEventComplete();friend class CGraphThread;CGraphThread* m_pGraphThread;bool m_bOpenedThruThread;CAtlArray<REFERENCE_TIME> m_kfs;bool m_fOpeningAborted;bool m_bWasSnapped;public:void OpenCurPlaylistItem(REFERENCE_TIME rtStart = 0);void OpenMedia(CAutoPtr<OpenMediaData> pOMD);void PlayFavoriteFile(CString fav);void PlayFavoriteDVD(CString fav);bool ResetDevice();bool DisplayChange();void CloseMedia();void StartTunerScan(CAutoPtr<TunerScanData> pTSD);void StopTunerScan();HRESULT SetChannel(int nChannel);void AddCurDevToPlaylist();bool m_fTrayIcon;//设置系统托盘图标void ShowTrayIcon(bool fShow);void SetTrayTip(CString str);CSize GetVideoSize() const;void ToggleFullscreen(bool fToNearest, bool fSwitchScreenResWhenHasTo);void ToggleD3DFullscreen(bool fSwitchScreenResWhenHasTo);void MoveVideoWindow(bool fShowStats = false);void RepaintVideo();void HideVideoWindow(bool fHide);OAFilterState GetMediaState() const;REFERENCE_TIME GetPos() const;REFERENCE_TIME GetDur() const;void SeekTo(REFERENCE_TIME rt, bool fSeekToKeyFrame = false);//设置播放速率void SetPlayingRate(double rate);DWORD SetupAudioStreams();DWORD SetupSubtitleStreams();//字幕bool LoadSubtitle(CString fn, ISubStream** actualStream = nullptr, bool bAutoLoad = false);bool SetSubtitle(int i, bool bIsOffset = false, bool bDisplayMessage = false, bool bApplyDefStyle = false);void SetSubtitle(ISubStream* pSubStream, bool bApplyDefStyle = false);void ToggleSubtitleOnOff(bool bDisplayMessage = false);void ReplaceSubtitle(const ISubStream* pSubStreamOld, ISubStream* pSubStreamNew);void InvalidateSubtitle(DWORD_PTR nSubtitleId = -1, REFERENCE_TIME rtInvalidate = -1);void ReloadSubtitle();HRESULT InsertTextPassThruFilter(IBaseFilter* pBF, IPin* pPin, IPin* pPinto);void SetAudioTrackIdx(int index);void SetSubtitleTrackIdx(int index);void AddFavorite(bool fDisplayMessage = false, bool fShowDialog = true);// shadersCAtlList<CString> m_shaderlabels;CAtlList<CString> m_shaderlabelsScreenSpace;void SetShaders();void UpdateShaders(CString label);// capturingbool m_fCapturing;HRESULT BuildCapture(IPin* pPin, IBaseFilter* pBF[3], const GUID& majortype, AM_MEDIA_TYPE* pmt); // pBF: 0 buff, 1 enc, 2 mux, pmt is for 1 encbool BuildToCapturePreviewPin(IBaseFilter* pVidCap, IPin** pVidCapPin, IPin** pVidPrevPin,IBaseFilter* pAudCap, IPin** pAudCapPin, IPin** pAudPrevPin);bool BuildGraphVideoAudio(int fVPreview, bool fVCapture, int fAPreview, bool fACapture);bool DoCapture(), StartCapture(), StopCapture();bool DoAfterPlaybackEvent();void ParseDirs(CAtlList<CString>& sl);bool SearchInDir(bool bDirForward, bool bLoop = false);virtual BOOL PreCreateWindow(CREATESTRUCT& cs);virtual BOOL PreTranslateMessage(MSG* pMsg);virtual BOOL OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo);virtual void RecalcLayout(BOOL bNotify = TRUE);// DVB capturevoid ShowCurrentChannelInfo(bool fShowOSD = true, bool fShowInfoBar = false);// Implementation
public:virtual ~CMainFrame();
#ifdef _DEBUGvirtual void AssertValid() const;virtual void Dump(CDumpContext& dc) const;
#endifprotected:  // control bar embedded membersCChildView m_wndView;UINT m_nCS;CPlayerSeekBar m_wndSeekBar;CPlayerToolBar m_wndToolBar;CPlayerInfoBar m_wndInfoBar;CPlayerInfoBar m_wndStatsBar;CPlayerStatusBar m_wndStatusBar;CList<CControlBar*> m_bars;CPlayerSubresyncBar m_wndSubresyncBar;CPlayerPlaylistBar m_wndPlaylistBar;CPlayerCaptureBar m_wndCaptureBar;CPlayerNavigationBar m_wndNavigationBar;CPlayerShaderEditorBar m_wndShaderEditorBar;CEditListEditor m_wndEditListEditor;CList<CSizingControlBar*> m_dockingbars;...// Generated message map functionsDECLARE_MESSAGE_MAP()public://打开的时候加载afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);//关闭的时候加载afx_msg void OnDestroy();afx_msg LRESULT OnTaskBarRestart(WPARAM, LPARAM);afx_msg LRESULT OnNotifyIcon(WPARAM, LPARAM);afx_msg LRESULT OnTaskBarThumbnailsCreate(WPARAM, LPARAM);afx_msg LRESULT OnSkypeAttach(WPARAM wParam, LPARAM lParam);afx_msg void OnSetFocus(CWnd* pOldWnd);afx_msg void OnGetMinMaxInfo(MINMAXINFO* lpMMI);afx_msg void OnMove(int x, int y);afx_msg void OnMoving(UINT fwSide, LPRECT pRect);afx_msg void OnSize(UINT nType, int cx, int cy);afx_msg void OnSizing(UINT fwSide, LPRECT pRect);afx_msg void OnDisplayChange();afx_msg void OnSysCommand(UINT nID, LPARAM lParam);afx_msg void OnActivateApp(BOOL bActive, DWORD dwThreadID);afx_msg LRESULT OnAppCommand(WPARAM wParam, LPARAM lParam);afx_msg void OnRawInput(UINT nInputcode, HRAWINPUT hRawInput);afx_msg LRESULT OnHotKey(WPARAM wParam, LPARAM lParam);afx_msg void OnTimer(UINT_PTR nIDEvent);afx_msg LRESULT OnGraphNotify(WPARAM wParam, LPARAM lParam);afx_msg LRESULT OnResetDevice(WPARAM wParam, LPARAM lParam);afx_msg LRESULT OnRepaintRenderLess(WPARAM wParam, LPARAM lParam);afx_msg LRESULT OnResumeFromState(WPARAM wParam, LPARAM lParam);...// menu item handlersafx_msg void OnFileOpenQuick();afx_msg void OnFileOpenmedia();afx_msg void OnUpdateFileOpen(CCmdUI* pCmdUI);afx_msg BOOL OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct);afx_msg void OnFileOpendvd();afx_msg void OnFileOpendevice();afx_msg void OnFileOpenCD(UINT nID);afx_msg void OnFileReopen();afx_msg void OnFileRecycle();afx_msg void OnDropFiles(HDROP hDropInfo); // no menu item...afx_msg void OnHelpHomepage();afx_msg void OnHelpCheckForUpdate();afx_msg void OnHelpToolbarImages();afx_msg void OnHelpDonate();//关闭的时候加载afx_msg void OnClose();afx_msg void OnLanguage(UINT nID);afx_msg void OnUpdateLanguage(CCmdUI* pCmdUI);CMPC_Lcd m_Lcd;// ==== Added by CASIMIR666CWnd*           m_pVideoWnd;            // Current Video (main display screen or 2nd)SIZE            m_fullWndSize;CFullscreenWnd* m_pFullscreenWnd;CVMROSD     m_OSD;bool        m_bRemainingTime;int         m_nCurSubtitle;long        m_lSubtitleShift;REFERENCE_TIME m_rtCurSubPos;CString     m_strTitle;bool        m_bToggleShader;bool        m_bToggleShaderScreenSpace;bool        m_bInOptions;bool        m_bStopTunerScan;bool        m_bLockedZoomVideoWindow;int         m_nLockedZoomVideoWindow;bool        m_fSetChannelActive;void        SetLoadState(MPC_LOADSTATE iState);void        SetPlayState(MPC_PLAYSTATE iState);bool        CreateFullScreenWindow();void        SetupEVRColorControl();void        SetupVMR9ColorControl();void        SetColorControl(DWORD flags, int& brightness, int& contrast, int& hue, int& saturation);void        SetClosedCaptions(bool enable);LPCTSTR     GetDVDAudioFormatName(const DVD_AudioAttributes& ATR) const;void        SetAudioDelay(REFERENCE_TIME rtShift);void        SetSubtitleDelay(int delay_ms);//void      AutoSelectTracks();bool        IsRealEngineCompatible(CString strFilename) const;void        SetTimersPlay();void        KillTimersStop();// MPC API functionsvoid        ProcessAPICommand(COPYDATASTRUCT* pCDS);void        SendAPICommand(MPCAPI_COMMAND nCommand, LPCWSTR fmt, ...);void        SendNowPlayingToApi();void        SendSubtitleTracksToApi();void        SendAudioTracksToApi();void        SendPlaylistToApi();...protected:// GDI+ULONG_PTR m_gdiplusToken;virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);void WTSRegisterSessionNotification();void WTSUnRegisterSessionNotification();DWORD m_nMenuHideTick;UINT m_nSeekDirection;
public:afx_msg UINT OnPowerBroadcast(UINT nPowerEvent, UINT nEventData);afx_msg void OnSessionChange(UINT nSessionState, UINT nId);void EnableShaders1(bool enable);void EnableShaders2(bool enable);CAtlList<CHdmvClipInfo::PlaylistItem> m_MPLSPlaylist;bool m_bIsBDPlay;bool OpenBD(CString Path);
};

面对一个如此巨大的类，可能会让人感觉到无从下手。我开始研究的时候也不知道该从何学起（实际上找到CMainFrame这个类就花了我挺长时间的，开始的时候根本没找到哪个类才是mpc-hc的最核心的类）。经过一段时间的探索，我发现了打开一个媒体的函数OpenMedia()，这个函数应该是我们每次使用mpc-hc都一定会调用的函数。从这个函数开始学习源代码还是比较合适的。

在看OpenMedia()代码之前，先来看看有哪些函数调用它了。我们可以借助VC2010的“查看调用层次结构”功能来完成这个任务。发现有3个函数：

OnFileOpendevice()//打开一个设备（比如说摄像头）
OnFileOpendvd()//打开一个DVD
OpenCurPlaylistItem()//打开播放列表的一条记录（比如说一个文件）

这3个函数正好对应着mpc-hc的3个功能：打开设备（摄像头），打开DVD，打开文件。这3个函数在这里就不多讲了，以后有机会再进行分析。

下面我们来看看OpenMedia()函数：

//打开媒体（非private）
void CMainFrame::OpenMedia(CAutoPtr<OpenMediaData> pOMD)
{// shortcutif (OpenDeviceData* p = dynamic_cast<OpenDeviceData*>(pOMD.m_p)) {if (m_iMediaLoadState == MLS_LOADED && m_pAMTuner&& m_VidDispName == p->DisplayName[0] && m_AudDispName == p->DisplayName[1]) {m_wndCaptureBar.m_capdlg.SetVideoInput(p->vinput);m_wndCaptureBar.m_capdlg.SetVideoChannel(p->vchannel);m_wndCaptureBar.m_capdlg.SetAudioInput(p->ainput);SendNowPlayingToSkype();return;}}if (m_iMediaLoadState != MLS_CLOSED) {CloseMedia();}//m_iMediaLoadState = MLS_LOADING; // HACK: hides the logoconst CAppSettings& s = AfxGetAppSettings();bool fUseThread = m_pGraphThread && s.fEnableWorkerThreadForOpening;if (OpenFileData* p = dynamic_cast<OpenFileData*>(pOMD.m_p)) {if (!p->fns.IsEmpty()) {engine_t e = s.m_Formats.GetEngine(p->fns.GetHead());if (e != DirectShow /*&& e != RealMedia && e != QuickTime*/) {fUseThread = false;}}} else if (OpenDeviceData* p = dynamic_cast<OpenDeviceData*>(pOMD.m_p)) {fUseThread = false;}// Create D3DFullscreen window if launched in fullscreenif (s.IsD3DFullscreen() && m_fStartInD3DFullscreen) {if (s.AutoChangeFullscrRes.bEnabled) {AutoChangeMonitorMode();}CreateFullScreenWindow();m_pVideoWnd = m_pFullscreenWnd;m_fStartInD3DFullscreen = false;} else {m_pVideoWnd = &m_wndView;}if (fUseThread) {m_pGraphThread->PostThreadMessage(CGraphThread::TM_OPEN, 0, (LPARAM)pOMD.Detach());m_bOpenedThruThread = true;} else {//打开媒体（private）OpenMediaPrivate(pOMD);m_bOpenedThruThread = false;}
}

这里需要注意，OpenMedia()调用了函数OpenMediaPrivate()。文件的打开功能实际上是在OpenMediaPrivate()中完成的。

下面我们来看看OpenMediaPrivate()的代码，发现比OpenMedia()要复杂很多。

//打开一个媒体（private）
bool CMainFrame::OpenMediaPrivate(CAutoPtr<OpenMediaData> pOMD)
{//获得设置信息CAppSettings& s = AfxGetAppSettings();if (m_iMediaLoadState != MLS_CLOSED) {ASSERT(0);return false;}//OpenFileData//OpenDVDData//OpenDeviceData//里面包含了文件或者DVD信息（名称等）OpenFileData* pFileData = dynamic_cast<OpenFileData*>(pOMD.m_p);OpenDVDData* pDVDData = dynamic_cast<OpenDVDData*>(pOMD.m_p);OpenDeviceData* pDeviceData = dynamic_cast<OpenDeviceData*>(pOMD.m_p);if (!pFileData && !pDVDData  && !pDeviceData) {ASSERT(0);return false;}// Clear DXVA state ...ClearDXVAState();#ifdef _DEBUG// Debug trace code - Begin// Check for bad / buggy auto loading file codeif (pFileData) {POSITION pos = pFileData->fns.GetHeadPosition();UINT index = 0;while (pos != nullptr) {CString path = pFileData->fns.GetNext(pos);TRACE(_T("--> CMainFrame::OpenMediaPrivate - pFileData->fns[%d]:\n"), index);TRACE(_T("\t%ws\n"), path.GetString()); // %ws - wide character string alwaysindex++;}}// Debug trace code - End
#endifCString mi_fn = _T("");if (pFileData) {if (pFileData->fns.IsEmpty()) {return false;}CString fn = pFileData->fns.GetHead();int i = fn.Find(_T(":\\"));if (i > 0) {CString drive = fn.Left(i + 2);UINT type = GetDriveType(drive);CAtlList<CString> sl;if (type == DRIVE_REMOVABLE || type == DRIVE_CDROM && GetCDROMType(drive[0], sl) != CDROM_Audio) {int ret = IDRETRY;while (ret == IDRETRY) {WIN32_FIND_DATA findFileData;HANDLE h = FindFirstFile(fn, &findFileData);if (h != INVALID_HANDLE_VALUE) {FindClose(h);ret = IDOK;} else {CString msg;msg.Format(IDS_MAINFRM_114, fn);ret = AfxMessageBox(msg, MB_RETRYCANCEL);}}if (ret != IDOK) {return false;}}mi_fn = fn;}}SetLoadState(MLS_LOADING);// FIXME: Don't show "Closed" initiallyPostMessage(WM_KICKIDLE);CString err;m_fUpdateInfoBar = false;BeginWaitCursor();try {CComPtr<IVMRMixerBitmap9>    pVMB;CComPtr<IMFVideoMixerBitmap> pMFVMB;CComPtr<IMadVRTextOsd>       pMVTO;if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}OpenCreateGraphObject(pOMD);if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}SetupIViAudReg();if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}//按类型的不同打开不同的文件if (pFileData) {//文件OpenFile(pFileData);} else if (pDVDData) {//DVDOpenDVD(pDVDData);} else if (pDeviceData) {if (s.iDefaultCaptureDevice == 1) {HRESULT hr = OpenBDAGraph();if (FAILED(hr)) {throw (UINT)IDS_CAPTURE_ERROR_DEVICE;}} else {OpenCapture(pDeviceData);}} else {throw (UINT)IDS_INVALID_PARAMS_ERROR;}m_pCAP2 = nullptr;m_pCAP = nullptr;//查找接口m_pGB->FindInterface(__uuidof(ISubPicAllocatorPresenter), (void**)&m_pCAP, TRUE);m_pGB->FindInterface(__uuidof(ISubPicAllocatorPresenter2), (void**)&m_pCAP2, TRUE);m_pGB->FindInterface(__uuidof(IVMRWindowlessControl9), (void**)&m_pVMRWC, FALSE); // might have IVMRMixerBitmap9, but not IVMRWindowlessControl9m_pGB->FindInterface(__uuidof(IVMRMixerControl9), (void**)&m_pVMRMC, TRUE);m_pGB->FindInterface(__uuidof(IVMRMixerBitmap9), (void**)&pVMB, TRUE);m_pGB->FindInterface(__uuidof(IMFVideoMixerBitmap), (void**)&pMFVMB, TRUE);pMVTO = m_pCAP;if (s.fShowOSD || s.fShowDebugInfo) { // Force OSD on when the debug switch is usedif (pVMB) {m_OSD.Start(m_pVideoWnd, pVMB, IsD3DFullScreenMode());} else if (pMFVMB) {m_OSD.Start(m_pVideoWnd, pMFVMB, IsD3DFullScreenMode());} else if (pMVTO) {m_OSD.Start(m_pVideoWnd, pMVTO);}}//VMR9SetupVMR9ColorControl();// === EVR !m_pGB->FindInterface(__uuidof(IMFVideoDisplayControl), (void**)&m_pMFVDC,  TRUE);m_pGB->FindInterface(__uuidof(IMFVideoProcessor), (void**)&m_pMFVP, TRUE);if (m_pMFVDC) {m_pMFVDC->SetVideoWindow(m_pVideoWnd->m_hWnd);}//SetupEVRColorControl();//does not work at this location//need to choose the correct mode (IMFVideoProcessor::SetVideoProcessorMode)BeginEnumFilters(m_pGB, pEF, pBF) {if (m_pLN21 = pBF) {m_pLN21->SetServiceState(s.fClosedCaptions ? AM_L21_CCSTATE_On : AM_L21_CCSTATE_Off);break;}}EndEnumFilters;if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}//打开自定义的GraphOpenCustomizeGraph();if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}//设置视频窗口OpenSetupVideo();if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}//设置音量OpenSetupAudio();if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}if (m_pCAP && (!m_fAudioOnly || m_fRealMediaGraph)) {if (s.fDisableInternalSubtitles) {m_pSubStreams.RemoveAll(); // Needs to be replaced with code that checks for forced subtitles.}m_posFirstExtSub = nullptr;POSITION pos = pOMD->subs.GetHeadPosition();while (pos) {LoadSubtitle(pOMD->subs.GetNext(pos), nullptr, true);}}if (m_fOpeningAborted) {throw (UINT)IDS_AG_ABORTED;}//设置视频窗口标题OpenSetupWindowTitle(pOMD->title);if (s.fEnableEDLEditor) {m_wndEditListEditor.OpenFile(pOMD->title);}if (::GetCurrentThreadId() == AfxGetApp()->m_nThreadID) {OnFilePostOpenmedia();} else {PostMessage(WM_COMMAND, ID_FILE_POST_OPENMEDIA);}while (m_iMediaLoadState != MLS_LOADED&& m_iMediaLoadState != MLS_CLOSING // FIXME) {Sleep(50);}//设置音频流DWORD audstm = SetupAudioStreams();//设置字幕流DWORD substm = SetupSubtitleStreams();if (audstm) {OnPlayAudio(ID_AUDIO_SUBITEM_START + audstm);}if (substm) {SetSubtitle(substm - 1);}// PostMessage instead of SendMessage because the user might call CloseMedia and then we would deadlockPostMessage(WM_COMMAND, ID_PLAY_PAUSE);m_bFirstPlay = true;if (!(s.nCLSwitches & CLSW_OPEN) && (s.nLoops > 0)) {PostMessage(WM_COMMAND, ID_PLAY_PLAY);} else {// If we don't start playing immediately, we need to initialize// the seekbar and the time counter.OnTimer(TIMER_STREAMPOSPOLLER);OnTimer(TIMER_STREAMPOSPOLLER2);}s.nCLSwitches &= ~CLSW_OPEN;if (pFileData) {if (pFileData->rtStart > 0) {PostMessage(WM_RESUMEFROMSTATE, (WPARAM)PM_FILE, (LPARAM)(pFileData->rtStart / 10000));  // REFERENCE_TIME doesn't fit in LPARAM under a 32bit env.}} else if (pDVDData) {if (pDVDData->pDvdState) {PostMessage(WM_RESUMEFROMSTATE, (WPARAM)PM_DVD, (LPARAM)(CComPtr<IDvdState>(pDVDData->pDvdState).Detach()));    // must be released by the called message handler}} else if (pDeviceData) {m_wndCaptureBar.m_capdlg.SetVideoInput(pDeviceData->vinput);m_wndCaptureBar.m_capdlg.SetVideoChannel(pDeviceData->vchannel);m_wndCaptureBar.m_capdlg.SetAudioInput(pDeviceData->ainput);}} catch (LPCTSTR msg) {err = msg;} catch (CString& msg) {err = msg;} catch (UINT msg) {err.LoadString(msg);}EndWaitCursor();if (!err.IsEmpty()) {//关闭CloseMediaPrivate();m_closingmsg = err;if (err != ResStr(IDS_AG_ABORTED)) {if (pFileData) {m_wndPlaylistBar.SetCurValid(false);if (m_wndPlaylistBar.IsAtEnd()) {m_nLoops++;}if (s.fLoopForever || m_nLoops < s.nLoops) {bool hasValidFile = false;if (m_nLastSkipDirection == ID_NAVIGATE_SKIPBACK) {hasValidFile = m_wndPlaylistBar.SetPrev();} else {hasValidFile = m_wndPlaylistBar.SetNext();}if (hasValidFile) {OpenCurPlaylistItem();}} else if (m_wndPlaylistBar.GetCount() > 1) {DoAfterPlaybackEvent();}} else {OnNavigateSkip(ID_NAVIGATE_SKIPFORWARD);}}} else {m_wndPlaylistBar.SetCurValid(true);// Apply command line audio shiftif (s.rtShift != 0) {SetAudioDelay(s.rtShift);s.rtShift = 0;}}m_nLastSkipDirection = 0;if (s.AutoChangeFullscrRes.bEnabled && (m_fFullScreen || IsD3DFullScreenMode())) {AutoChangeMonitorMode();}if (m_fFullScreen && s.fRememberZoomLevel) {m_fFirstFSAfterLaunchOnFS = true;}m_LastOpenFile = pOMD->title;PostMessage(WM_KICKIDLE); // calls main thread to update thingsif (!m_bIsBDPlay) {m_MPLSPlaylist.RemoveAll();m_LastOpenBDPath = _T("");}m_bIsBDPlay = false;return err.IsEmpty();
}

这里需要注意，根据打开方式的不同，OpenMediaPrivate()调用了不同的函数。

如果输入的类型为文件，则调用OpenFile()

如果输入的类型为DVD，则调用OpenDVD()

如果输入的类型为设备（例如摄像头），则调用OpenCapture()

在这里，我们假设输入的类型为文件（实际上这也是最普遍的情况）。

看看OpenFile()的源代码。

//打开文件
void CMainFrame::OpenFile(OpenFileData* pOFD)
{if (pOFD->fns.IsEmpty()) {throw (UINT)IDS_MAINFRM_81;}//获取设置CAppSettings& s = AfxGetAppSettings();bool bMainFile = true;POSITION pos = pOFD->fns.GetHeadPosition();while (pos) {CString fn = pOFD->fns.GetNext(pos);fn.Trim();if (fn.IsEmpty() && !bMainFile) {break;}//使用DirectShow播放文件HRESULT hr = m_pGB->RenderFile(CStringW(fn), nullptr);if (bMainFile) {// Don't try to save file position if source isn't seekableREFERENCE_TIME rtDur = 0;m_pMS->GetDuration(&rtDur);m_bRememberFilePos = s.fKeepHistory && s.fRememberFilePos && rtDur > 0;if (m_bRememberFilePos && !s.filePositions.AddEntry(fn)) {REFERENCE_TIME rtPos = s.filePositions.GetLatestEntry()->llPosition;if (m_pMS) {m_pMS->SetPositions(&rtPos, AM_SEEKING_AbsolutePositioning, nullptr, AM_SEEKING_NoPositioning);}}}QueryPerformanceCounter(&m_liLastSaveTime);if (FAILED(hr)) {if (bMainFile) {if (s.fReportFailedPins) {CComQIPtr<IGraphBuilderDeadEnd> pGBDE = m_pGB;if (pGBDE && pGBDE->GetCount()) {CMediaTypesDlg(pGBDE, GetModalParent()).DoModal();}}UINT err;switch (hr) {case E_ABORT:case RFS_E_ABORT:err = IDS_MAINFRM_82;break;case E_FAIL:case E_POINTER:default:err = IDS_MAINFRM_83;break;case E_INVALIDARG:err = IDS_MAINFRM_84;break;case E_OUTOFMEMORY:err = IDS_AG_OUT_OF_MEMORY;break;case VFW_E_CANNOT_CONNECT:err = IDS_MAINFRM_86;break;case VFW_E_CANNOT_LOAD_SOURCE_FILTER:err = IDS_MAINFRM_87;break;case VFW_E_CANNOT_RENDER:err = IDS_MAINFRM_88;break;case VFW_E_INVALID_FILE_FORMAT:err = IDS_MAINFRM_89;break;case VFW_E_NOT_FOUND:err = IDS_MAINFRM_90;break;case VFW_E_UNKNOWN_FILE_TYPE:err = IDS_MAINFRM_91;break;case VFW_E_UNSUPPORTED_STREAM:err = IDS_MAINFRM_92;break;case RFS_E_NO_FILES:err = IDS_RFS_NO_FILES;break;case RFS_E_COMPRESSED:err = IDS_RFS_COMPRESSED;break;case RFS_E_ENCRYPTED:err = IDS_RFS_ENCRYPTED;break;case RFS_E_MISSING_VOLS:err = IDS_RFS_MISSING_VOLS;break;}throw err;}}// We don't keep track of the standard input since that hardly makes any senseif (s.fKeepHistory && fn != _T("pipe:0")) {CRecentFileList* pMRU = bMainFile ? &s.MRU : &s.MRUDub;pMRU->ReadList();pMRU->Add(fn);pMRU->WriteList();SHAddToRecentDocs(SHARD_PATH, fn);}if (bMainFile) {pOFD->title = fn;}bMainFile = false;if (m_fCustomGraph) {break;}}if (s.fReportFailedPins) {CComQIPtr<IGraphBuilderDeadEnd> pGBDE = m_pGB;if (pGBDE && pGBDE->GetCount()) {CMediaTypesDlg(pGBDE, GetModalParent()).DoModal();}}if (!(m_pAMOP = m_pGB)) {BeginEnumFilters(m_pGB, pEF, pBF);if (m_pAMOP = pBF) {break;}EndEnumFilters;}if (FindFilter(CLSID_MPCShoutcastSource, m_pGB)) {m_fUpdateInfoBar = true;}SetupChapters();CComQIPtr<IKeyFrameInfo> pKFI;BeginEnumFilters(m_pGB, pEF, pBF);if (pKFI = pBF) {break;}EndEnumFilters;UINT nKFs = 0;if (pKFI && S_OK == pKFI->GetKeyFrameCount(nKFs) && nKFs > 0) {UINT k = nKFs;if (!m_kfs.SetCount(k) || S_OK != pKFI->GetKeyFrames(&TIME_FORMAT_MEDIA_TIME, m_kfs.GetData(), k) || k != nKFs) {m_kfs.RemoveAll();}}//设置播放模式SetPlaybackMode(PM_FILE);
}

从OpenFile()函数的源代码我们可以看出，mpc-hc调用了DirectShow的函数，打开相应的文件。比如说：

HRESULT hr = m_pGB->RenderFile(CStringW(fn), nullptr);

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