more progroess on MPD-Protocol.xml
git-svn-id: https://svn.musicpd.org/mpd/trunk@1462 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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Warren Dukes
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<holder>Warren Dukes</holder>
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</copyright>
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</articleinfo>
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<sect1>
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<sect1 id="protocol_outline">
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<title>Protocol Outline</title>
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<para>The MPD Protocol has Three Components: Commands, Responses, and Command Lists. All communication between the client and server uses the UTF-8 character encoding.</para>
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<sect2>
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<sect2 id="format_of_commands">
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<title>Format of Commands</title>
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<para>Commands in MPD are specified begginning with the name of the command. The arguments of a command are delimitted by spaces and should be surrounded by double qutotation marks. The end of a command is delimitted by a return character '<literal>\n</literal>'.<programlisting>command "arg1" "arg2"</programlisting></para>
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</sect2>
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<sect2>
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<title>Format of Responses</title>
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<title id="format_of_responses">Format of Responses</title>
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<para>The different response elements of a command are seperated by the return character '<literal>\n</literal>'. The last element of a response begin with either <literal>OK</literal> or <literal>ACK</literal>. Thus, if a command is successful, the end of the response is <literal>OK\n</literal>. If a command is unsuccessful <literal>ACK</literal> terminates the command with the following format:<programlisting>ACK {err#:cmd#} {command} some error message</programlisting><literal>err#</literal> is an integer indicating the specific error that occured and <literal>cmd#</literal> is an integer indicating which command of the command list caused the error (See section 1.3 for more info on Command Lists). <literal>command</literal> gives the name of the command the error occurred on; however, its intended more for debugging persons (for human readability). <literal>some error message</literal> is also not intended to be parsed by clients but is intended more for debugging purposes.</para>
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<para>The other response elements are data. The data is seperated into a name and value pare by <literal>: </literal>. Thus, a possible command response containing data would be:<programlisting>Name1: Value1
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Name2: Value2
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OK</programlisting></para>
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</sect2>
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<sect2>
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<sect2 id="command_lists">
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<title>Command Lists</title>
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<para>Command lists allow for a fast, effecient, and atomic execution of multiple commands. Command lists are initiated with either <literal>command_list_begin</literal> or <literal>command_list_ok_begin</literal>and are terminated with <literal>command_list_end</literal>.<programlisting>command_list_begin
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command1 arg1 arg2
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@ -34,11 +34,11 @@ command_list_end</programlisting></para>
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<para><literal>command_list_ok_begin</literal> responds with <literal>list_OK</literal> after each command is successfully completed. <literal>command_list_begin</literal> does not return anything between each command that is executed.</para>
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</sect2>
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</sect1>
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<sect1>
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<sect1 id="commands">
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<title>Commands</title>
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<sect2>
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<sect2 id="db_browsing">
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<title>DB: Browsing, Searching, and Finding</title>
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<sect3>
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<sect3 id="browsing_responses">
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<title>Browsing Responses</title>
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<para>Browsing Responses usually contain groups of several responses. These groups are either begin with <literal>file</literal>, <literal>directory</literal>, or <literal>playlist</literal>. Each of these response groups maybe followed by metadata, which always begin with a capital letter (A-Z). Here's an example of a complete browsing response:<programlisting>file: Directory/file.mp3
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Artist: Muscian
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@ -49,34 +49,61 @@ playlist: Directory/favorites
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OK</programlisting></para>
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<para><literal>directory</literal> and <literal>playlist</literal> have no metadata, however future versions of the MPD protocol may add metadata to either. Also, future versions of MPD may add othe response groups for browsing.</para>
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</sect3>
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<sect3>
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<sect3 id="song_info_responses">
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<title>Song Info Responses</title>
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<para>For query information on songs in the db (and the playlist), there is a common response for each song. The first response element is <literal>file</literal>. The remainng elements of the song info are one of the following metadata types: <literal>Artist</literal>, <literal>Album</literal>, <literal>Title</literal>, <literal>Track</literal>, <literal>Name</literal>, or <literal>Time</literal>.</para>
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</sect3>
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<sect3>
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<sect3 id="lsinfo">
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<title>
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<literal>lsinfo</literal>
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</title>
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<para><programlisting>lsinfo
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lsinfo <emphasis>directory</emphasis>
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lsinfo <emphasis>file</emphasis></programlisting><literal>lsinfo</literal> responds with <link linkend="browsing_responses">info</link> for the directory or file specified. If <literal>lsinfo</literal> is called without any arguments then the root directory is implied as the path.</para>
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</sect3>
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<sect3>
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<title id="listallinfo">
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<literal>listallinfo</literal>
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</title>
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<para><programlisting>listallinfo
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listallinfo <emphasis>directory</emphasis>
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listallinfo <emphasis>file</emphasis></programlisting><literal>listallinfo</literal> is a recursive form of <literal>
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<link linkend="lsinfo">lsinfo</link>
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</literal></para>
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</sect3>
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<sect3>
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<title>
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<literal>listall</literal>
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</title>
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<para><programlisting>listall
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listall <emphasis>directory</emphasis>
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listall <emphasis>file</emphasis></programlisting><literal>listall</literal> is the same as <literal>
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<link linkend="listallinfo">listallinfo</link>
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</literal> except that no metadata is returned.</para>
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</sect3>
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<sect3>
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<title>
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<literal>search</literal>
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</title>
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<para><programlisting>search filename <emphasis>pattern</emphasis>
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search artist <emphasis>pattern</emphasis>
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search album <emphasis>pattern</emphasis>
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search title <emphasis>pattern</emphasis></programlisting><literal>search</literal> respnds with the <link linkend="song_info_responses">files</link> that match the specified pattern with the specified data (either <literal>filename</literal>, <literal>artist</literal>, <literal>album</literal>, or <literal>title</literal>).</para>
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</sect3>
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<sect3>
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<title>
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<literal>find</literal>
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</title>
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<para><programlisting>find artist <emphasis>match</emphasis>
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find album <emphasis>match</emphasis></programlisting><literal>find</literal> responds with the <link linkend="song_info_responses">files</link> whose <literal>artist</literal> or <literal>album</literal> are the same as <emphasis>match</emphasis>.</para>
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</sect3>
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<sect3>
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<title>
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<literal>list</literal>
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</title>
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<para><programlisting>list artist
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list album
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list album <emphasis>someArtist</emphasis></programlisting><literal>list</literal> responds with the list of albums or artists in the db.</para>
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</sect3>
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</sect2>
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<sect2>
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@ -91,71 +118,90 @@ OK</programlisting></para>
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<title>
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<literal>playlistinfo</literal>
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</title>
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<para><programlisting>playlistinfo
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playlistinfo -1
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playlistinfo <emphasis>position</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>playlistid</literal>
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</title>
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<para><programlisting>playlistid
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playlistid -1
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playlistid <emphasis>id</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>plchanges</literal>
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</title>
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<para><programlisting>plchanges <emphasis>version</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>deleteid</literal>
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</title>
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<para><programlisting>deleteid <emphasis>id</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>delete</literal>
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</title>
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<para><programlisting>delete <emphasis>position</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>add</literal>
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</title>
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<para><programlisting>add <emphasis>file</emphasis>
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add <emphasis>url</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>moveid</literal>
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</title>
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<para><programlisting>movid <emphasis>id</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>move</literal>
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</title>
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<para><programlisting>move <emphasis>position</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>swapid</literal>
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</title>
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<para><programlisting>swapid <emphasis>id</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>swap</literal>
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</title>
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<para><programlisting>swap <emphasis>position</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>clear</literal>
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</title>
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<para><programlisting>clear</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>save</literal>
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</title>
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<para><programlisting>save</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>shuffle</literal>
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</title>
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<para><programlisting>shuffle</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>rm</literal>
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</title>
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<para><programlisting>rm</programlisting></para>
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</sect3>
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</sect2>
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<sect2>
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@ -164,6 +210,13 @@ OK</programlisting></para>
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<title>
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<literal>status</literal>
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</title>
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<para><programlisting>status</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>currentsong</literal>
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</title>
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<para><programlisting>currentsong</programlisting></para>
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</sect3>
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</sect2>
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<sect2>
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@ -172,41 +225,56 @@ OK</programlisting></para>
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<title>
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<literal>playid</literal>
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</title>
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<para><programlisting>playid
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playid -1
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playid <emphasis>id</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>play</literal>
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</title>
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<para><programlisting>play
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play -1
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play <emphasis>position</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>pause</literal>
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</title>
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<para><programlisting>pause 0
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pause 1</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>stop</literal>
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</title>
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<para><programlisting>stop</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>seekid</literal>
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</title>
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<para><programlisting>seekid <emphasis>id</emphasis> <emphasis>seconds</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>seek</literal>
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</title>
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<para><programlisting>seek <emphasis>position</emphasis> <emphasis>seconds</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>repeat</literal>
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</title>
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<para><programlisting>repeat 0
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repeat 1</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>random</literal>
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</title>
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<para><programlisting>random 0
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random 1</programlisting></para>
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</sect3>
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</sect2>
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<sect2>
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@ -215,16 +283,19 @@ OK</programlisting></para>
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<title>
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<literal>password</literal>
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</title>
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<para><programlisting>password <emphasis>psswd</emphasis></programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>stats</literal>
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</title>
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<para><programlisting>stats</programlisting></para>
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</sect3>
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<sect3>
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<title>
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<literal>kill</literal>
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</title>
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<para><programlisting>kill</programlisting></para>
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</sect3>
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</sect2>
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</sect1>
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