注：写了一系列分析Media Player Classic - HC 源代码的文章，在此列一个列表：
Media Player Classic - HC 源代码分析 1：整体结构Media Player Classic - HC 源代码分析 2：核心类 （CMainFrame）（1）
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）
上一篇文章分析了Media Player Classic - HC（mpc-hc）的源代码中的核心类 CMainFrame：Media Player Classic - HC 源代码分析 2：核心类 （CMainFrame）（1）
主要介绍了CMainFrame类中的以下几个函数（“->”代表调用关系）：
OpenMedia()->OpenMediaPrivate()->OpenFile()
本文补充介绍CMainFrame类中的其他一些函数。
再回顾一下打开文件功能主要所在的函数OpenMediaPrivate()：
//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 code
if (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]:
"), index);
TRACE(_T(" %ws
"), path.GetString()); // %ws - wide character string always
index++;
}
}
// Debug trace code - End
#endif
CString 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" initially
PostMessage(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) {
//DVD
OpenDVD(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 IVMRWindowlessControl9
m_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 used
if (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);
}
}
//VMR9
SetupVMR9ColorControl();
// === 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Graph
OpenCustomizeGraph();
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 deadlock
PostMessage(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 shift
if (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 things
if (!m_bIsBDPlay) {
m_MPLSPlaylist.RemoveAll();
m_LastOpenBDPath = _T("");
}
m_bIsBDPlay = false;
return err.IsEmpty();
}来看一看OpenMediaPrivate()函数的细节：
1.开始的时候有这么一句
CAppSettings& s = AfxGetAppSettings();
在这里涉及到一个类CAppSettings，存储的是mpc-hc用到的各种设置信息。源代码如下：
//应用程序中的各种参数
class CAppSettings
{
bool fInitialized;
class CRecentFileAndURLList : public CRecentFileList
{
public:
CRecentFileAndURLList(UINT nStart, LPCTSTR lpszSection,
LPCTSTR lpszEntryFormat, int nSize,
int nMaxDispLen = AFX_ABBREV_FILENAME_LEN);
virtual void Add(LPCTSTR lpszPathName); // we have to override CRecentFileList::Add because the original version can't handle URLs
};
public:
bool fShaderEditorWasOpened;
// cmdline params
UINT nCLSwitches;
CAtlList<CString> slFiles, slDubs, slSubs, slFilters;
// Initial position (used by command line flags)
REFERENCE_TIME rtShift;
REFERENCE_TIME rtStart;
ULONG lDVDTitle;
ULONG lDVDChapter;
DVD_HMSF_TIMECODE DVDPosition;
CSize sizeFixedWindow;
bool HasFixedWindowSize() const { return sizeFixedWindow.cx > 0 || sizeFixedWindow.cy > 0; }
//int iFixedWidth, iFixedHeight;
int iMonitor;
CString ParseFileName(CString const& param);
void ParseCommandLine(CAtlList<CString>& cmdln);
// Added a Debug display to the screen (/debug option)
bool fShowDebugInfo;
int iAdminOption;
//播放器 Player
bool fAllowMultipleInst;
bool fTrayIcon;
bool fShowOSD;
bool fLimitWindowProportions;
bool fSnapToDesktopEdges;
bool fHideCDROMsSubMenu;
DWORD dwPriority;
int iTitleBarTextStyle;
bool fTitleBarTextTitle;
bool fKeepHistory;
CRecentFileAndURLList MRU;
CRecentFileAndURLList MRUDub;
CFilePositionList filePositions;
CDVDPositionList dvdPositions;
bool fRememberDVDPos;
bool fRememberFilePos;
bool bRememberPlaylistItems;
bool fRememberWindowPos;
CRect rcLastWindowPos;
bool fRememberWindowSize;
bool fSavePnSZoom;
double dZoomX;
double dZoomY;
// Formats
CMediaFormats m_Formats;
bool fAssociatedWithIcons;
// Keys
CList<wmcmd> wmcmds;
HACCEL hAccel;
bool fWinLirc;
CString strWinLircAddr;
CWinLircClient WinLircClient;
bool fUIce;
CString strUIceAddr;
CUIceClient UIceClient;
bool fGlobalMedia;
//图标 Logo
UINT nLogoId;
bool fLogoExternal;
CString strLogoFileName;
//web界面？ Web Inteface
BOOL fEnableWebServer;
int nWebServerPort;
int nCmdlnWebServerPort;
bool fWebServerUseCompression;
bool fWebServerLocalhostOnly;
bool fWebServerPrintDebugInfo;
CString strWebRoot, strWebDefIndex;
CString strWebServerCGI;
//播放时候 Playback
int nVolume;
bool fMute;
int nBalance;
int nLoops;
bool fLoopForever;
bool fRewind;
bool fRememberZoomLevel;
int nAutoFitFactor;
int iZoomLevel;
CStringW strAudiosLanguageOrder;
CStringW strSubtitlesLanguageOrder;
bool fEnableWorkerThreadForOpening;
bool fReportFailedPins;
bool fAutoloadAudio;
bool fAutoloadSubtitles;
bool fBlockVSFilter;
UINT nVolumeStep;
UINT nSpeedStep;
// DVD/OGM
bool fUseDVDPath;
CString strDVDPath;
LCID idMenuLang, idAudioLang, idSubtitlesLang;
bool fAutoSpeakerConf;
bool fClosedCaptions;
//输出 Output
CRenderersSettings m_RenderersSettings;
int iDSVideoRendererType;
int iRMVideoRendererType;
int iQTVideoRendererType;
CStringW strAudioRendererDisplayName;
bool fD3DFullscreen;
//全屏 Fullscreen
bool fLaunchfullscreen;
bool fShowBarsWhenFullScreen;
int nShowBarsWhenFullScreenTimeOut;
bool fExitFullScreenAtTheEnd;
CStringW strFullScreenMonitor;
AChFR AutoChangeFullscrRes;
bool fRestoreResAfterExit;
// Sync Renderer Settings
// Capture (BDA configuration)
int iDefaultCaptureDevice; // Default capture device (analog=0, 1=digital)
CString strAnalogVideo;
CString strAnalogAudio;
int iAnalogCountry;
CString strBDANetworkProvider;
CString strBDATuner;
CString strBDAReceiver;
//CString strBDAStandard;
int iBDAScanFreqStart;
int iBDAScanFreqEnd;
int iBDABandwidth;
bool fBDAUseOffset;
int iBDAOffset;
bool fBDAIgnoreEncryptedChannels;
UINT nDVBLastChannel;
CAtlList<CDVBChannel> m_DVBChannels;
DVB_RebuildFilterGraph nDVBRebuildFilterGraph;
DVB_StopFilterGraph nDVBStopFilterGraph;
// Internal Filters
bool SrcFilters[SRC_LAST + !SRC_LAST];
bool TraFilters[TRA_LAST + !TRA_LAST];
//音频 Audio Switcher
bool fEnableAudioSwitcher;
bool fAudioNormalize;
UINT nAudioMaxNormFactor;
bool fAudioNormalizeRecover;
UINT nAudioBoost;
bool fDownSampleTo441;
bool fAudioTimeShift;
int iAudioTimeShift;
bool fCustomChannelMapping;
int nSpeakerChannels;
DWORD pSpeakerToChannelMap[AS_MAX_CHANNELS][AS_MAX_CHANNELS];
// External Filters
CAutoPtrList<FilterOverride> m_filters;
//字幕 Subtitles
bool fOverridePlacement;
int nHorPos, nVerPos;
int nSubDelayInterval;
// Default Style
STSStyle subdefstyle;
// Misc
bool bPreferDefaultForcedSubtitles;
bool fPrioritizeExternalSubtitles;
bool fDisableInternalSubtitles;
bool bAllowOverridingExternalSplitterChoice;
CString strSubtitlePaths;
CString strISDb;
// Tweaks
int nJumpDistS;
int nJumpDistM;
int nJumpDistL;
bool fFastSeek;
bool fShowChapters;
bool bNotifySkype;
bool fPreventMinimize;
bool fUseWin7TaskBar;
bool fLCDSupport;
bool fUseSearchInFolder;
bool fUseTimeTooltip;
int nTimeTooltipPosition;
CString strOSDFont;
int nOSDSize;
//亮度色度饱和度 Miscellaneous
int iBrightness;
int iContrast;
int iHue;
int iSaturation;
int nUpdaterAutoCheck;
int nUpdaterDelay;
// MENUS
// View
int iCaptionMenuMode; // normal -> hidemenu -> frameonly -> borderless
bool fHideNavigation;
UINT nCS; // Control state for toolbars
// Language
LANGID language;
// Subtitles menu
bool fEnableSubtitles;
bool fUseDefaultSubtitlesStyle;
// Video Frame
int iDefaultVideoSize;
bool fKeepAspectRatio;
CSize sizeAspectRatio;
bool fCompMonDeskARDiff;
// Pan&Scan
CString strPnSPreset;
CStringArray m_pnspresets;
// On top menu
int iOnTop;
// After Playback
bool fExitAfterPlayback;
bool fNextInDirAfterPlayback;
// WINDOWS
// Add Favorite
bool bFavRememberPos;
bool bFavRelativeDrive;
// Save Image...
CString strSnapShotPath, strSnapShotExt;
// Save Thumbnails...
int iThumbRows, iThumbCols, iThumbWidth;
// Shader Editor
struct Shader {
CString label;
CString target;
CString srcdata;
};
CAtlList<Shader> m_shaders;
// Shader Combiner
bool fToggleShader;
bool fToggleShaderScreenSpace;
CString strShaderList;
CString strShaderListScreenSpace;
// Playlist (contex menu)
bool bShufflePlaylistItems;
bool bHidePlaylistFullScreen;
// OTHER STATES
CStringW strLastOpenDir;
UINT nLastWindowType;
UINT nLastUsedPage;
bool fRemainingTime;
bool fLastFullScreen;
bool fIntRealMedia;
//bool fRealMediaRenderless;
//float dRealMediaQuickTimeFPS;
//int iVideoRendererType;
//int iQuickTimeRenderer;
//bool fMonitorAutoRefreshRate;
bool fEnableEDLEditor;
HWND hMasterWnd;
bool IsD3DFullscreen() const;
CString SelectedAudioRenderer() const;
bool IsISREnabled() const;
private:
CString SrcFiltersKeys[SRC_LAST + !SRC_LAST];
CString TraFiltersKeys[TRA_LAST + !TRA_LAST];
__int64 ConvertTimeToMSec(const CString& time) const;
void ExtractDVDStartPos(CString& strParam);
void CreateCommands();
void SaveExternalFilters(CAutoPtrList<FilterOverride>& filters, LPCTSTR baseKey = IDS_R_EXTERNAL_FILTERS);
void LoadExternalFilters(CAutoPtrList<FilterOverride>& filters, LPCTSTR baseKey = IDS_R_EXTERNAL_FILTERS);
void ConvertOldExternalFiltersList();
void UpdateRenderersData(bool fSave);
friend void CRenderersSettings::UpdateData(bool bSave);
public:
CAppSettings();
virtual ~CAppSettings();
void SaveSettings();
void LoadSettings();
void SaveExternalFilters() { if (fInitialized) { SaveExternalFilters(m_filters); } };
void GetFav(favtype ft, CAtlList<CString>& sl) const;
void SetFav(favtype ft, CAtlList<CString>& sl);
void AddFav(favtype ft, CString s);
CDVBChannel* FindChannelByPref(int nPrefNumber);
bool GetAllowMultiInst() const;
static bool IsVSFilterInstalled();
static bool HasEVR();
};由代码可见，包含的参数信息很多。在mpc-hc中，任何需要获取设置信息的地方，都可以使用AfxGetAppSettings()获得CAppSettings的引用。
2.OpenSetupVideo()这个函数的作用是设置视频窗口，源代码如下：
//设置视频窗口
void CMainFrame::OpenSetupVideo()
{
//大部分都在确定：m_fAudioOnly是否为True
m_fAudioOnly = true;
//获得视频的宽和高，然后调整窗口大小
if (m_pMFVDC) { // EVR
m_fAudioOnly = false;
} else if (m_pCAP) {
CSize vs = m_pCAP->GetVideoSize();
m_fAudioOnly = (vs.cx <= 0 || vs.cy <= 0);
} else {
{
long w = 0, h = 0;
if (CComQIPtr<IBasicVideo> pBV = m_pGB) {
pBV->GetVideoSize(&w, &h);
}
if (w > 0 && h > 0) {
m_fAudioOnly = false;
}
}
//如果 m_fAudioOnly=true；再检查
if (m_fAudioOnly) {
BeginEnumFilters(m_pGB, pEF, pBF) {
long w = 0, h = 0;
if (CComQIPtr<IVideoWindow> pVW = pBF) {
long lVisible;
if (FAILED(pVW->get_Visible(&lVisible))) {
continue;
}
pVW->get_Width(&w);
pVW->get_Height(&h);
}
if (w > 0 && h > 0) {
m_fAudioOnly = false;
break;
}
}
EndEnumFilters;
}
}
if (m_fShockwaveGraph) {
m_fAudioOnly = false;
}
if (m_pCAP) {
SetShaders();
}
// else
{
// TESTME
//设置所有者。。。
m_pVW->put_Owner((OAHWND)m_pVideoWnd->m_hWnd);
m_pVW->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN);
m_pVW->put_MessageDrain((OAHWND)m_hWnd);
for (CWnd* pWnd = m_wndView.GetWindow(GW_CHILD); pWnd; pWnd = pWnd->GetNextWindow()) {
pWnd->EnableWindow(FALSE); // little trick to let WM_SETCURSOR thru
}
}
//如果只有音频，则消灭视频窗口！
if (m_fAudioOnly && IsD3DFullScreenMode()) {
m_pFullscreenWnd->DestroyWindow();
}
}3.OpenSetupAudio()这个函数的作用是设置音频，源代码如下：
//设置音量
void CMainFrame::OpenSetupAudio()
{
//设置音量
m_pBA->put_Volume(m_wndToolBar.Volume);
// FIXME
int balance = AfxGetAppSettings().nBalance;
int sign = balance > 0 ? -1 : 1; // -1: invert sign for more right channel
if (balance > -100 && balance < 100) {
balance = sign * (int)(100 * 20 * log10(1 - abs(balance) / 100.0f));
} else {
balance = sign * (-10000); // -10000: only left, 10000: only right
}
//设置均衡
m_pBA->put_Balance(balance);
}4.如果出现问题，则会调用CloseMediaPrivate()，关闭打开的媒体。
//关闭
void CMainFrame::CloseMediaPrivate()
{
SetLoadState(MLS_CLOSING); // why it before OnPlayStop()? // TODO: remake or add detailed comments
OnPlayStop(); // SendMessage(WM_COMMAND, ID_PLAY_STOP);
if (m_pMC) {
m_pMC->Stop(); // needed for StreamBufferSource, because m_iMediaLoadState is always MLS_CLOSED // TODO: fix the opening for such media
}
SetPlaybackMode(PM_NONE);
m_fLiveWM = false;
m_fEndOfStream = false;
m_rtDurationOverride = -1;
m_kfs.RemoveAll();
m_pCB.Release();
{
CAutoLock cAutoLock(&m_csSubLock);
m_pSubStreams.RemoveAll();
}
m_pSubClock.Release();
//if (m_pVW) m_pVW->put_Visible(OAFALSE);
//if (m_pVW) m_pVW->put_MessageDrain((OAHWND)NULL), m_pVW->put_Owner((OAHWND)NULL);
// IMPORTANT: IVMRSurfaceAllocatorNotify/IVMRSurfaceAllocatorNotify9 has to be released before the VMR/VMR9, otherwise it will crash in Release()
//各种清空
m_OSD.Stop();
m_pCAP2.Release();
m_pCAP.Release();
m_pVMRWC.Release();
m_pVMRMC.Release();
m_pMFVP.Release();
m_pMFVDC.Release();
m_pLN21.Release();
m_pSyncClock.Release();
m_pAMXBar.Release();
m_pAMDF.Release();
m_pAMVCCap.Release();
m_pAMVCPrev.Release();
m_pAMVSCCap.Release();
m_pAMVSCPrev.Release();
m_pAMASC.Release();
m_pVidCap.Release();
m_pAudCap.Release();
m_pAMTuner.Release();
m_pCGB.Release();
m_pDVDC.Release();
m_pDVDI.Release();
m_pAMOP.Release();
m_pBI.Release();
m_pQP.Release();
m_pFS.Release();
m_pMS.Release();
m_pBA.Release();
m_pBV.Release();
m_pVW.Release();
m_pME.Release();
m_pMC.Release();
if (m_pGB) {
m_pGB->RemoveFromROT();
m_pGB.Release();
}
m_pProv.Release();
m_fRealMediaGraph = m_fShockwaveGraph = m_fQuicktimeGraph = false;
m_VidDispName.Empty();
m_AudDispName.Empty();
m_closingmsg.LoadString(IDS_CONTROLS_CLOSED);
AfxGetAppSettings().nCLSwitches &= CLSW_OPEN | CLSW_PLAY | CLSW_AFTERPLAYBACK_MASK | CLSW_NOFOCUS;
//设置状态
SetLoadState(MLS_CLOSED);
}