Difference between revisions of "Bemix Notes"
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Bemix is capable of dumping data in multiple of formats. Currently
Bemix is capable of dumping data in multiple of formats. Currently "client" and "html" formats are planned, but XML/RDF formats are possibly in the future. The format of the export is indicated in the URL by the mandatory <code>output</code> parameter.
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Revision as of 02:21, 16 January 2006
Bemix is a web-based media player. It supports multiple soundcards and various networked client types, allowing a group to use a centralized server to control several speakers. Commands are issued through URLs, where the URL portion of the address represents the command to be issued, while the GET portion of the URL passes in parameters to the server.
All URLs are relative to http://slugwiki.mit.edu:8080/, and all URLs have an output=[html, client]. An example URL is http://slugwiki.mit.edu:8080/play?output=client&playerId=2. All
... must be properly encoded for URLs.
Each command returns a data structure through HTTP that defines variable names and values. A (variable name, value) combination is referred to as a field. Every command contains at least one
success field, whose value may be either
false. If any tag is
false, it should be assumed that the entire command failed. Each command may optionally return a
comment field as well, whose value gives some indication of why an operation may have failed.
In addition, most commands return additional information about the state of a particular aspect of the bemix server.
Bemix is capable of dumping data in multiple of formats. Currently only the "client" and "html" formats are planned, but XML/RDF formats are possibly in the future. The format of the export is indicated in the URL by the mandatory
The "client" output format returns data in a simple newline-delimited list. String values are not delimited by quote characters, and list items are delimited by commas (including a comma after the final element). The format of each line is
name is the name of the variable being returned, and
value is the value of the variable. No whitespace characters are inserted between
The order in which the fields are returned is not guaranteed, and it should not be assumed that all tags will be present or in any particular order.
The MIME type of the client output is 'text/plain'.
The result of the browse command http://slugwiki.mit.edu:8080/browse?output=client&dir=/P/Porcupine%20Tree
dir0=/P/Porcupine Tree/Coma Divine dir1=/P/Porcupine Tree/Spiral Circus dir2=/P/Porcupine Tree/In Absentia dir3=/P/Porcupine Tree/Insignificance dir4=/P/Porcupine Tree/Lightbulb Sun dir5=/P/Porcupine Tree/Metanoia dir6=/P/Porcupine Tree/On the Sunday of Life dir7=/P/Porcupine Tree/Recordings file0=/P/Porcupine Tree/Chloroform (Instrumental Rough Mix).mp3 file1=/P/Porcupine Tree/Disappear (Demo Version 2.0).mp3 file2=/P/Porcupine Tree/Is Not.mp3 file3=/P/Porcupine Tree/2003 Intro Music.mp3 file4=/P/Porcupine Tree/Even Less, Part 2.mp3 file5=/P/Porcupine Tree/London.mp3 success=true
The result of the playlists command http://slugwiki.mit.edu:8080/playlists?output=client
The result of the players command with an invalid playerId http://slugwiki.mit.edu:8080/player?output=client&playerId=2
success=false comment=playerId not found success=true
When dumping data as HTML, bemix creates pages that can also be used to issue commands to the server. For instance, a browse page generates a link for each directory that is being displayed that points to the browse page for that subdirectory.
HTML output is meant to be used through a webbrowser. If you're interested in manipulating the bemix server through some other means, use the "client" output format described above.