MediaInfo源代码分析 4：Inform()函数

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。