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Convert Win32 codec importing HOWTO into a text document in the tech section.
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DOCS/tech/win32-codec-howto.txt
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DOCS/tech/win32-codec-howto.txt
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============================
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Win32 codecs importing HOWTO
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============================
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This document describes how to extract the information necessary to hook
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up Win32 binary codecs in MPlayer from a Windows system. Different methods
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exist depending on which video API your codec uses and which Windows
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version you have.
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If you have gathered all the necessary information (fourcc, GUID, codec file,
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sample file) as described below, notify the mplayer-dev-eng mailing list.
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If you want to add a codec yourself, read DOCS/tech/codecs.conf.txt.
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VFW codecs
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~~~~~~~~~~
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VFW (Video for Windows) is the old video API for Windows. Its codecs have
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the '.dll' or (rarely) '.drv' extension. If MPlayer fails at playing your
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AVI with this kind of message:
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UNKNOWN video codec: HFYU (0x55594648)
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It means your AVI is encoded with a codec which has the HFYU fourcc (HFYU =
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HuffYUV codec, DIV3 = DivX Low Motion, etc.). Now that you know this, you
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have to find out which DLL Windows loads in order to play this file. In our
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case, the 'system.ini' contains this information in a line that reads:
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VIDC.HFYU=huffyuv.dll
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So you need the 'huffyuv.dll' file. Note that the audio codecs are
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specified by the MSACM prefix:
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msacm.l3acm=L3codeca.acm
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This is the MP3 codec.
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DirectShow codecs:
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~~~~~~~~~~~~~~~~~~
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DirectShow is the newer video API, which is even worse than its predecessor.
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Things are harder with DirectShow, since 'system.ini' does not contain the
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needed information, instead it is stored in the registry and we need the
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GUID of the codec.
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New Method:
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-----------
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Using Microsoft GraphEdit (fast)
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- Get GraphEdit from either DirectX SDK or doom9.
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- Start 'graphedit.exe'.
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- From the menu select "Graph -> Insert Filters".
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- Expand item "DirectShow Filters".
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- Select the right codec name and expand item.
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- In the entry "DisplayName" look at the text in winged brackets after the
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backslash and write it down (five dash-delimited blocks, the GUID).
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- The codec binary is the file specified in the "Filename" entry.
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If there is no "Filename" and "DisplayName" contains something like
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'device:dmo', then it is a DMO-Codec.
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Old Method:
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-----------
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Take a deep breath and start searching the registry...
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- Start 'regedit'.
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- Press "Ctrl-F", disable the first two checkboxes, and enable the third.
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Type in the fourcc of the codec (e.g. "TM20").
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- You should see a field which contains the path and the filename (e.g.
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"C:\WINDOWS\SYSTEM\TM20DEC.AX").
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- Now that you have the file, we need the GUID. Try searching again, but
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now search for the codec's name, not the fourcc. Its name can be acquired
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when Media Player is playing the file, by checking
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"File -> Properties -> Advanced".
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If not, you are out of luck. Try guessing (e.g. search for TrueMotion).
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- If the GUID is found you should see a "FriendlyName" and a "CLSID" field.
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Write down the 16 byte CLSID, this is the GUID we need.
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If searching fails, try enabling all the checkboxes. You may have
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false hits, but you may get lucky...
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@ -12,8 +12,8 @@ of our homepage.
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</para>
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<para>
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If you have a Win32 codec which is not supported yet,
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please read the <link linkend="codec-importing">codec importing HOWTO</link>
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If you have a Win32 codec which is not supported yet, please read the
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<ulink url="../../tech/win32-codec-howto">Win32 codec HOWTO</ulink>
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and help us add support for it.
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</para>
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@ -96,161 +96,4 @@ only white noise).
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</sect1>
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<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
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<sect1 id="codec-importing">
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<title>Win32 codecs importing HOWTO</title>
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<!-- TODO: a short paragraph of text would be nice here... -->
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<sect2 id="vfw-codecs">
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<title>VFW codecs</title>
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<para>
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VFW (Video for Windows) is the old Video API for Windows. Its codecs have
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the <filename>.DLL</filename> or (rarely) <filename>.DRV</filename>
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extension. If <application>MPlayer</application> fails at playing your AVI
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with this kind of message:
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<screen>UNKNOWN video codec: HFYU (0x55594648)</screen>
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It means your AVI is encoded with a codec which has the HFYU fourcc (HFYU =
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HuffYUV codec, DIV3 = DivX Low Motion, etc.). Now that you know this, you
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have to find out which DLL Windows loads in order to play this file. In our
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case, the <filename>system.ini</filename> contains this information in a
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line that reads:
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<programlisting>VIDC.HFYU=huffyuv.dll</programlisting>
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</para>
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<para>
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So you need the <filename>huffyuv.dll</filename> file. Note that the audio
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codecs are specified by the MSACM prefix:
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<programlisting>msacm.l3acm=L3codeca.acm</programlisting>
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</para>
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<para>
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This is the MP3 codec. Now that you have all the necessary information
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(fourcc, codec file, sample AVI), submit your codec support request by
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mail, and upload these files to the FTP site:
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<systemitem role="url">ftp://upload.mplayerhq.hu/MPlayer/incoming/<replaceable><codecname></replaceable>/</systemitem>
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</para>
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<note><para>
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On Windows NT/2000/XP search for this info in the registry,
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e.g. search for "VIDC.HFYU". To find out how to do this, look at
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the old DirectShow method below.
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</para></note>
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</sect2>
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<!-- ********** -->
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<sect2 id="dshow-codecs">
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<title>DirectShow codecs</title>
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<para>
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DirectShow is the newer Video API, which is even worse than its predecessor.
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Things are harder with DirectShow, since
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<itemizedlist>
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<listitem><para>
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<filename>system.ini</filename> does not contain the needed information,
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instead it is stored in the registry and
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</para></listitem>
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<listitem><para>
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we need the GUID of the codec.
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</para></listitem>
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</itemizedlist>
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</para>
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<procedure>
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<title>New Method:</title>
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<para>
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Using <application>Microsoft GraphEdit</application> (fast)
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</para>
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<step><para>
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Get <application>GraphEdit</application> from either DirectX SDK or
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<ulink url="http://doom9.net">doom9</ulink>.
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</para></step>
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<step><para>
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Start <command>graphedit.exe</command>.
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</para></step>
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<step><para>
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From the menu select
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<menuchoice><guimenu>Graph</guimenu>
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<guisubmenu>Insert Filters</guisubmenu></menuchoice>.
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</para></step>
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<step><para>
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Expand item <systemitem>DirectShow Filters</systemitem>.
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</para></step>
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<step><para>
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Select the right codec name and expand item.
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</para></step>
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<step><para>
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In the entry <systemitem>DisplayName</systemitem> look at the text in
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winged brackets after the backslash and write it down (five dash-delimited
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blocks, the GUID).
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</para></step>
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<step><para>
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The codec binary is the file specified in the
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<systemitem>Filename</systemitem> entry.
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</para></step>
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</procedure>
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<note><para>
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If there is no <systemitem>Filename</systemitem> and
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<systemitem>DisplayName</systemitem> contains something like
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<systemitem>device:dmo</systemitem>, then it is a DMO-Codec.
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</para></note>
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<procedure>
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<title>Old Method:</title>
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<para>
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Take a deep breath and start searching the registry...
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</para>
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<step><para>
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Start <command>regedit</command>.
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</para></step>
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<step><para>
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Press <keycombo><keycap>Ctrl</keycap><keycap>F</keycap></keycombo>, disable
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the first two checkboxes, and enable the third. Type in the fourcc of the
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codec (e.g. <userinput>TM20</userinput>).
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</para></step>
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<step><para>
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You should see a field which contains the path and the filename (e.g.
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<filename>C:\WINDOWS\SYSTEM\TM20DEC.AX</filename>).
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</para></step>
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<step><para>
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Now that you have the file, we need the GUID. Try searching again, but
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now search for the codec's name, not the fourcc. Its name can be acquired
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when Media Player is playing the file, by checking
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<menuchoice><guimenu>File</guimenu> <guisubmenu>Properties</guisubmenu>
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<guimenuitem>Advanced</guimenuitem></menuchoice>.
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If not, you are out of luck. Try guessing (e.g. search for TrueMotion).
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</para></step>
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<step><para>
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If the GUID is found you should see a <guilabel>FriendlyName</guilabel>
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and a <guilabel>CLSID</guilabel> field. Write down the 16 byte CLSID,
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this is the GUID we need.
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</para></step>
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</procedure>
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<note><para>
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If searching fails, try enabling all the checkboxes. You may have
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false hits, but you may get lucky...
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</para></note>
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<para>
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Now that you have all the necessary information (fourcc, GUID, codec file,
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sample AVI), submit your codec support request by mail, and upload these files
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to the FTP site:
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<systemitem role="url">ftp://upload.mplayerhq.hu/MPlayer/incoming/<replaceable><codecname></replaceable>/</systemitem>
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</para>
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<para>
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If you want to add a codec yourself, read
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<ulink url="http://www.mplayerhq.hu/MPlayer/DOCS/tech/codecs.conf.txt">DOCS/tech/codecs.conf.txt</ulink>.
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</para>
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</sect2>
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</sect1>
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</chapter>
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@ -236,7 +236,8 @@ I have problems playing files with the ... codec. Can I use them?
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Check the <ulink url="../../codecs-status.html">codec status</ulink>,
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if it doesn't contain your codec, read the
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<link linkend="codecs">codec documentation</link>, especially the
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<link linkend="codec-importing">codec importing HOWTO</link> and contact us.
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<ulink url="../../tech/win32-codec-howto">Win32 codec HOWTO</ulink>
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and contact us.
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</para></answer>
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</qandaentry>
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