Media Player Classic - HC 源代码分析 6：详细信息选项卡（CPPageFileInfoDetails）
前几篇文章分析了Media Player Classic - HC（mpc-hc）的核心类（CMainFrame）：
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）
核心类分析完之后，分析了其他几个重要的类：
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 5：MediaInfo选项卡 （CPPageFileMediaInfo）
本文分析一下mpc-hc的详细信息选项卡。在播放视频的时候，右键点击视频->选择“属性”后默认打开的就是该选项卡。一般情况下，该选项卡给出了正在播放的视频文件的一些基本参数：视频大小，分辨率，时长等。注意：详细信息选项卡和MediaInfo选项卡获得视频参数的原理是不一样的。详细信息选项卡是通过调用DirectShow函数接口而获得的视频的参数。而MediaInfo选项卡则是通过调用MediaInfo类库而获得视频的参数。
先看看选项卡长什么样子：
先来看看详细信息选项卡类的定义是什么样的吧。该类的定义位于PPageFileInfoDetails.h文件中。
/* 雷霄骅 * 中国传媒大学/数字电视技术 * leixiaohua1020@126.com * */ /* * (C) 2003-2006 Gabest * (C) 2006-2013 see Authors.txt * * This file is part of MPC-HC. * * MPC-HC 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 3 of the License, or * (at your option) any later version. * * MPC-HC 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 this program. If not, see <http://www.gnu.org/licenses/>. * *///取得一些基本信息#include "stdafx.h"#include "mplayerc.h"#include "PPageFileInfoDetails.h"#include <atlbase.h>#include "DSUtil.h"#include "text.h"#include <d3d9.h>#include <vmr9.h>#include "moreuuids.h"// CPPageFileInfoDetails dialogIMPLEMENT_DYNAMIC(CPPageFileInfoDetails, CPropertyPage)CPPageFileInfoDetails::CPPageFileInfoDetails(CString fn, IFilterGraph* pFG, ISubPicAllocatorPresenter* pCAP) : CPropertyPage(CPPageFileInfoDetails::IDD, CPPageFileInfoDetails::IDD) , m_fn(fn) , m_pFG(pFG) , m_pCAP(pCAP) , m_hIcon(nullptr) , m_type(ResStr(IDS_AG_NOT_KNOWN)) , m_size(ResStr(IDS_AG_NOT_KNOWN)) , m_time(ResStr(IDS_AG_NOT_KNOWN)) , m_res(ResStr(IDS_AG_NOT_KNOWN)) , m_created(ResStr(IDS_AG_NOT_KNOWN)){}CPPageFileInfoDetails::~CPPageFileInfoDetails(){ if (m_hIcon) { DestroyIcon(m_hIcon); }}void CPPageFileInfoDetails::DoDataExchange(CDataExchange* pDX){ __super::DoDataExchange(pDX); DDX_Control(pDX, IDC_DEFAULTICON, m_icon); DDX_Text(pDX, IDC_EDIT1, m_fn); DDX_Text(pDX, IDC_EDIT4, m_type); DDX_Text(pDX, IDC_EDIT3, m_size); DDX_Text(pDX, IDC_EDIT2, m_time); DDX_Text(pDX, IDC_EDIT5, m_res); DDX_Text(pDX, IDC_EDIT6, m_created); DDX_Control(pDX, IDC_EDIT7, m_encoding);}#define SETPAGEFOCUS (WM_APP + 252) // arbitrary number, can be changed if necessaryBEGIN_MESSAGE_MAP(CPPageFileInfoDetails, CPropertyPage) ON_MESSAGE(SETPAGEFOCUS, OnSetPageFocus)END_MESSAGE_MAP()// CPPageFileInfoDetails message handlersstatic bool GetProperty(IFilterGraph* pFG, LPCOLESTR propName, VARIANT* vt){ BeginEnumFilters(pFG, pEF, pBF) { if (CComQIPtr<IPropertyBag> pPB = pBF) if (SUCCEEDED(pPB->Read(propName, vt, nullptr))) { return true; } } EndEnumFilters; return false;}static CString FormatDateTime(FILETIME tm){ SYSTEMTIME st; FileTimeToSystemTime(&tm, &st); TCHAR buff[256]; GetDateFormat(LOCALE_USER_DEFAULT, DATE_LONGDATE, &st, nullptr, buff, _countof(buff)); CString ret(buff); ret += _T(" "); GetTimeFormat(LOCALE_USER_DEFAULT, 0, &st, nullptr, buff, _countof(buff)); ret += buff; return ret;}BOOL CPPageFileInfoDetails::OnInitDialog(){ __super::OnInitDialog(); if (m_fn.IsEmpty()) { BeginEnumFilters(m_pFG, pEF, pBF) { CComQIPtr<IFileSourceFilter> pFSF = pBF; if (pFSF) { LPOLESTR pFN = nullptr; AM_MEDIA_TYPE mt; if (SUCCEEDED(pFSF->GetCurFile(&pFN, &mt)) && pFN && *pFN) { m_fn = CStringW(pFN); CoTaskMemFree(pFN); } break; } } EndEnumFilters; } CString ext = m_fn.Left(m_fn.Find(_T("://")) + 1).TrimRight(':'); if (ext.IsEmpty() || !ext.CompareNoCase(_T("file"))) { ext = _T(".") + m_fn.Mid(m_fn.ReverseFind('.') + 1); } m_hIcon = LoadIcon(m_fn, false); if (m_hIcon) { m_icon.SetIcon(m_hIcon); } if (!LoadType(ext, m_type)) { m_type.LoadString(IDS_AG_NOT_KNOWN); } CComVariant vt; if (::GetProperty(m_pFG, L"CurFile.TimeCreated", &vt)) { if (V_VT(&vt) == VT_UI8) { ULARGE_INTEGER uli; uli.QuadPart = V_UI8(&vt); FILETIME ft; ft.dwLowDateTime = uli.LowPart; ft.dwHighDateTime = uli.HighPart; m_created = FormatDateTime(ft); } } WIN32_FIND_DATA wfd; HANDLE hFind = FindFirstFile(m_fn, &wfd); if (hFind != INVALID_HANDLE_VALUE) { FindClose(hFind); __int64 size = (__int64(wfd.nFileSizeHigh) << 32) | wfd.nFileSizeLow; const int MAX_FILE_SIZE_BUFFER = 65; WCHAR szFileSize[MAX_FILE_SIZE_BUFFER]; StrFormatByteSizeW(size, szFileSize, MAX_FILE_SIZE_BUFFER); CString szByteSize; szByteSize.Format(_T("%I64d"), size); m_size.Format(_T("%s (%s bytes)"), szFileSize, FormatNumber(szByteSize)); if (m_created.IsEmpty()) { m_created = FormatDateTime(wfd.ftCreationTime); } }//获取时常 REFERENCE_TIME rtDur = 0; CComQIPtr<IMediaSeeking> pMS = m_pFG; if (pMS && SUCCEEDED(pMS->GetDuration(&rtDur)) && rtDur > 0) { m_time = ReftimeToString2(rtDur); } CSize wh(0, 0), arxy(0, 0);//获取宽和高 if (m_pCAP) { wh = m_pCAP->GetVideoSize(false); arxy = m_pCAP->GetVideoSize(true); } else { if (CComQIPtr<IBasicVideo> pBV = m_pFG) { if (SUCCEEDED(pBV->GetVideoSize(&wh.cx, &wh.cy))) { if (CComQIPtr<IBasicVideo2> pBV2 = m_pFG) { pBV2->GetPreferredAspectRatio(&arxy.cx, &arxy.cy); } } else { wh.SetSize(0, 0); } } if (wh.cx == 0 && wh.cy == 0) { BeginEnumFilters(m_pFG, pEF, pBF) { if (CComQIPtr<IBasicVideo> pBV = pBF) { pBV->GetVideoSize(&wh.cx, &wh.cy); if (CComQIPtr<IBasicVideo2> pBV2 = pBF) { pBV2->GetPreferredAspectRatio(&arxy.cx, &arxy.cy); } break; } else if (CComQIPtr<IVMRWindowlessControl> pWC = pBF) { pWC->GetNativeVideoSize(&wh.cx, &wh.cy, &arxy.cx, &arxy.cy); break; } else if (CComQIPtr<IVMRWindowlessControl9> pWC9 = pBF) { pWC9->GetNativeVideoSize(&wh.cx, &wh.cy, &arxy.cx, &arxy.cy); break; } } EndEnumFilters; } } if (wh.cx > 0 && wh.cy > 0) { m_res.Format(_T("%dx%d"), wh.cx, wh.cy); int gcd = GCD(arxy.cx, arxy.cy); if (gcd > 1) { arxy.cx /= gcd; arxy.cy /= gcd; } if (arxy.cx > 0 && arxy.cy > 0 && arxy.cx * wh.cy != arxy.cy * wh.cx) { CString ar; ar.Format(_T(" (AR %d:%d)"), arxy.cx, arxy.cy); m_res += ar; } } m_fn.TrimRight('/'); m_fn.Replace('\\', '/'); m_fn = m_fn.Mid(m_fn.ReverseFind('/') + 1); UpdateData(FALSE); InitEncoding(); m_pFG = nullptr; m_pCAP = nullptr; return TRUE; // return TRUE unless you set the focus to a control // EXCEPTION: OCX Property Pages should return FALSE}BOOL CPPageFileInfoDetails::OnSetActive(){ BOOL ret = __super::OnSetActive(); PostMessage(SETPAGEFOCUS, 0, 0L); return ret;}LRESULT CPPageFileInfoDetails::OnSetPageFocus(WPARAM wParam, LPARAM lParam){ CPropertySheet* psheet = (CPropertySheet*) GetParent(); psheet->GetTabControl()->SetFocus(); return 0;}void CPPageFileInfoDetails::InitEncoding(){ CAtlList<CString> sl; BeginEnumFilters(m_pFG, pEF, pBF) { CComPtr<IBaseFilter> pUSBF = GetUpStreamFilter(pBF); if (GetCLSID(pBF) == CLSID_NetShowSource) { continue; } else if (GetCLSID(pUSBF) != CLSID_NetShowSource) { if (IPin* pPin = GetFirstPin(pBF, PINDIR_INPUT)) { CMediaType mt; if (FAILED(pPin->ConnectionMediaType(&mt)) || mt.majortype != MEDIATYPE_Stream) { continue; } } if (IPin* pPin = GetFirstPin(pBF, PINDIR_OUTPUT)) { CMediaType mt; if (SUCCEEDED(pPin->ConnectionMediaType(&mt)) && mt.majortype == MEDIATYPE_Stream) { continue; } } } BeginEnumPins(pBF, pEP, pPin) { CMediaTypeEx mt; PIN_DIRECTION dir; if (FAILED(pPin->QueryDirection(&dir)) || dir != PINDIR_OUTPUT || FAILED(pPin->ConnectionMediaType(&mt))) { continue; } CString str = mt.ToString(); if (!str.IsEmpty()) { if (mt.majortype == MEDIATYPE_Video) { // Sort streams, set Video streams at head bool found_video = false; for (POSITION pos = sl.GetTailPosition(); pos; sl.GetPrev(pos)) { CString Item = sl.GetAt(pos); if (!Item.Find(_T("Video:"))) { sl.InsertAfter(pos, str + CString(L" [" + GetPinName(pPin) + L"]")); found_video = true; break; } } if (!found_video) { sl.AddHead(str + CString(L" [" + GetPinName(pPin) + L"]")); } } else { sl.AddTail(str + CString(L" [" + GetPinName(pPin) + L"]")); } } } EndEnumPins; } EndEnumFilters; CString text = Implode(sl, '\n'); text.Replace(_T("\n"), _T("\r\n")); m_encoding.SetWindowText(text);}