MediaInfo源代码分析 4：Inform()函数
注：此前已经写了一系列分析MediaInfo源代码的文章，列表如下：
MediaInfo源代码分析 1：整体结构
MediaInfo源代码分析 2：API函数
MediaInfo源代码分析 3：Open()函数
MediaInfo源代码分析 4：Inform()函数
MediaInfo源代码分析 5：JPEG解析代码分析
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我们来看一下MediaInfo中的Inform()函数的内部调用过程
首先Inform()函数封装了MediaInfo_Internal类中的Inform()函数
//返回文件信息
String MediaInfo::Inform(size_t)
{
//封装了一层
return Internal->Inform();
}
查看一下MediaInfo_Internal类中的Inform()函数的源代码：
// 获取信息
Ztring MediaInfo_Internal::Inform()
{
CS.Enter();
if (Info && Info->Status[File__Analyze::IsUpdated])
Info->Open_Buffer_Update();
CS.Leave();
if (MediaInfoLib::Config.Inform_Get()==__T("MPEG-7"))
return Export_Mpeg7().Transform(*this);
if (MediaInfoLib::Config.Inform_Get()==__T("PBCore") || MediaInfoLib::Config.Inform_Get()==__T("PBCore_1.2"))
return Export_PBCore().Transform(*this);
if (MediaInfoLib::Config.Inform_Get()==__T("reVTMD"))
return __T("reVTMD is disabled due to its non-free licensing."); //return Export_reVTMD().Transform(*this);
//获取相应的信息
if (!(
MediaInfoLib::Config.Inform_Get(__T("General")).empty()
&& MediaInfoLib::Config.Inform_Get(__T("Video")).empty()
&& MediaInfoLib::Config.Inform_Get(__T("Audio")).empty()
&& MediaInfoLib::Config.Inform_Get(__T("Text")).empty()
&& MediaInfoLib::Config.Inform_Get(__T("Chapters")).empty()
&& MediaInfoLib::Config.Inform_Get(__T("Image")).empty()
&& MediaInfoLib::Config.Inform_Get(__T("Menu")).empty()
))
{
//获取各种信息
//Retour即为返回的字符串
Ztring Retour;
Retour+=MediaInfoLib::Config.Inform_Get(__T("File_Begin"));
Retour+=MediaInfoLib::Config.Inform_Get(__T("General_Begin"));
Retour+=Inform(Stream_General, 0, false);
Retour+=MediaInfoLib::Config.Inform_Get(__T("General_End"));
if (Count_Get(Stream_Video))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Video_Begin"));
for (size_t I1=0; I1<Count_Get(Stream_Video); I1++)
{
Retour+=Inform(Stream_Video, I1, false);
if (I1!=Count_Get(Stream_Video)-1)
Retour+=MediaInfoLib::Config.Inform_Get(__T("Video_Middle"));
}
if (Count_Get(Stream_Video))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Video_End"));
if (Count_Get(Stream_Audio))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Audio_Begin"));
for (size_t I1=0; I1<Count_Get(Stream_Audio); I1++)
{
Retour+=Inform(Stream_Audio, I1, false);
if (I1!=Count_Get(Stream_Audio)-1)
Retour+=MediaInfoLib::Config.Inform_Get(__T("Audio_Middle"));
}
if (Count_Get(Stream_Audio))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Audio_End"));
if (Count_Get(Stream_Text))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Text_Begin"));
for (size_t I1=0; I1<Count_Get(Stream_Text); I1++)
{
Retour+=Inform(Stream_Text, I1, false);
if (I1!=Count_Get(Stream_Text)-1)
Retour+=MediaInfoLib::Config.Inform_Get(__T("Text_Middle"));
}
if (Count_Get(Stream_Text))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Text_End"));
if (Count_Get(Stream_Other))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Chapters_Begin"));
for (size_t I1=0; I1<Count_Get(Stream_Other); I1++)
{
Retour+=Inform(Stream_Other, I1, false);
if (I1!=Count_Get(Stream_Other)-1)
Retour+=MediaInfoLib::Config.Inform_Get(__T("Chapters_Middle"));
}
if (Count_Get(Stream_Other))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Chapters_End"));
if (Count_Get(Stream_Image))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Image_Begin"));
for (size_t I1=0; I1<Count_Get(Stream_Image); I1++)
{
Retour+=Inform(Stream_Image, I1, false);
if (I1!=Count_Get(Stream_Image)-1)
Retour+=MediaInfoLib::Config.Inform_Get(__T("Image_Middle"));
}
if (Count_Get(Stream_Image))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Image_End"));
if (Count_Get(Stream_Menu))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Menu_Begin"));
for (size_t I1=0; I1<Count_Get(Stream_Menu); I1++)
{
Retour+=Inform(Stream_Menu, I1, false);
if (I1!=Count_Get(Stream_Menu)-1)
Retour+=MediaInfoLib::Config.Inform_Get(__T("Menu_Middle"));
}
if (Count_Get(Stream_Menu))
Retour+=MediaInfoLib::Config.Inform_Get(__T("Menu_End"));
Retour+=MediaInfoLib::Config.Inform_Get(__T("File_End"));
//可以在此加入视频质量检测-----------------------------------------
//字符串替换？各种换行符统统改为“\n”-----------------------------
Retour.FindAndReplace(__T("\\r\\n"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\\r"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\\n"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\r\n"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\r"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\n"), MediaInfoLib::Config.LineSeparator_Get(), 0, Ztring_Recursive);
//Special characters
Retour.FindAndReplace(__T("|SC1|"), __T("\\"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC2|"), __T("["), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC3|"), __T("]"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC4|"), __T(","), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC5|"), __T(";"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC6|"), __T("("), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC7|"), __T(")"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC8|"), __T(")"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC9|"), __T("),"), 0, Ztring_Recursive);
return Retour;
}
//Informations
Ztring Retour;
bool HTML=false;
bool XML=false;
bool CSV=false;
//获取配置信息（输出格式）
if (MediaInfoLib::Config.Inform_Get()==__T("HTML"))
HTML=true;
if (MediaInfoLib::Config.Inform_Get()==__T("XML"))
XML=true;
if (MediaInfoLib::Config.Inform_Get()==__T("CSV"))
CSV=true;
if (HTML) Retour+=__T("<html>\n\n<head>\n<META http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /></head>\n<body>\n");
if (XML) Retour+=__T("<File>\n");
for (size_t StreamKind=(size_t)Stream_General; StreamKind<Stream_Max; StreamKind++)
{
//Pour chaque type de flux
for (size_t StreamPos=0; StreamPos<(size_t)Count_Get((stream_t)StreamKind); StreamPos++)
{
//Pour chaque stream
//输出为HTML
if (HTML) Retour+=__T("<table width=\"100%\" border=\"0\" cellpadding=\"1\" cellspacing=\"2\" style=\"border:1px solid Navy\">\n<tr>\n <td width=\"150\"><h2>");
//输出为XML
if (XML) Retour+=__T("<track type=\"");
Ztring A=Get((stream_t)StreamKind, StreamPos, __T("StreamKind/String"));
Ztring B=Get((stream_t)StreamKind, StreamPos, __T("StreamKindPos"));
if (!XML && !B.empty())
{
if (CSV)
A+=__T(",");
else
A+=MediaInfoLib::Config.Language_Get(__T(" Config_Text_NumberTag"));
A+=B;
}
Retour+=A;
if (XML)
{
Retour+=__T("\"");
if (!B.empty())
{
Retour+=__T(" streamid=\"");
Retour+=B;
Retour+=__T("\"");
}
}
//输出为HTML
if (HTML) Retour+=__T("</h2></td>\n </tr>");
//输出为XML
if (XML) Retour+=__T(">");
Retour+=MediaInfoLib::Config.LineSeparator_Get();
Retour+=Inform((stream_t)StreamKind, StreamPos, false);
Retour.FindAndReplace(__T("\\"), __T("|SC1|"), 0, Ztring_Recursive);
if (HTML) Retour+=__T("</table>\n<br />");
if (XML) Retour+=__T("</track>\n");
Retour+=MediaInfoLib::Config.LineSeparator_Get();
}
}
//输出为HTML
if (HTML) Retour+=__T("\n</body>\n</html>\n");
//输出为XML
if (XML) Retour+=__T("</File>\n");
//字符串替换？
Retour.FindAndReplace(__T("\\r\\n"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\\r"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\\n"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\r\n"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\r"), __T("\n"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("\n"), MediaInfoLib::Config.LineSeparator_Get(), 0, Ztring_Recursive);
//Special characters
Retour.FindAndReplace(__T("|SC1|"), __T("\\"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC2|"), __T("["), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC3|"), __T("]"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC4|"), __T(","), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC5|"), __T(";"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC6|"), __T("("), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC7|"), __T(")"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC8|"), __T(")"), 0, Ztring_Recursive);
Retour.FindAndReplace(__T("|SC9|"), __T("),"), 0, Ztring_Recursive);
return Retour;
}
函数比较复杂，从代码中我们可以看出，Inform()的实质还是使用Get()一个一个取出所有的属性值。
当指定输出为XML或者是HTML的时候，在输出的字符串上加上相应的标签（例如，输出为HTML的时候，字符串每一行上加上“</tr><tr>”，首尾加上“<table></table>”）
具体每一块代码的含义已经写在注释中了。