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

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）



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) 2006-2012 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/>.
*
*/

#pragma once

#include "../SubPic/ISubPic.h"
#include <afxwin.h>

//取得一些基本信息
// CPPageFileInfoDetails dialog

class CPPageFileInfoDetails : public CPropertyPage
{
DECLARE_DYNAMIC(CPPageFileInfoDetails)

private:
CComPtr<IFilterGraph> m_pFG;
CComPtr<ISubPicAllocatorPresenter> m_pCAP;

HICON m_hIcon;

void InitEncoding();

public:
CPPageFileInfoDetails(CString fn, IFilterGraph* pFG, ISubPicAllocatorPresenter* pCAP);
virtual ~CPPageFileInfoDetails();

// Dialog Data
enum { IDD = IDD_FILEPROPDETAILS };

CStatic m_icon;
CString m_fn;
CString m_type;
CString m_size;
CString m_time;
CString m_res;
CString m_created;
CEdit   m_encoding;

protected:
virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
virtual BOOL OnInitDialog();
virtual BOOL OnSetActive();
virtual LRESULT OnSetPageFocus(WPARAM wParam, LPARAM lParam);

DECLARE_MESSAGE_MAP()

public:
};

该类的定义和普通的MFC对话框类差不多，有以下几点是需要注意的：

1.以下两个变量是用于获得对话框上显示的相关的信息的：

2.有一系列的字符串变量：m_fn， m_type， m_size， m_time等用于存储获得的信息

详细信息选项卡类的实现位于PPageFileInfoDetails.cpp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 dialog

IMPLEMENT_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 necessary

BEGIN_MESSAGE_MAP(CPPageFileInfoDetails, CPropertyPage)
ON_MESSAGE(SETPAGEFOCUS, OnSetPageFocus)
END_MESSAGE_MAP()

// CPPageFileInfoDetails message handlers

static 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);
}

从代码中可以看出，CPPageFileInfoDetails的功能是在OnInitDialog()中完成的。通过调用DirectShow相应的接口，分别获取了视频的宽高，时长等信息。