From: Andre Noll Date: Tue, 23 Oct 2007 17:07:21 +0000 (+0200) Subject: remove README.mysql. X-Git-Tag: v0.3.0~238 X-Git-Url: http://git.tue.mpg.de/?a=commitdiff_plain;h=933972ad847ced7049dc538255337224fbbf066d;p=paraslash.git remove README.mysql. --- diff --git a/README.mysql b/README.mysql deleted file mode 100644 index 4531a32c..00000000 --- a/README.mysql +++ /dev/null @@ -1,334 +0,0 @@ -============ -README.mysql -============ - ----- -This file describes how to use the mysql audio file selector which -comes with the paraslash package. - -It assumes you have already installed mysql and paraslash as described -in INSTALL, so read README and INSTALL before proceeding. - -First of all, make sure that - - - mysqld is running - - para_server is running and compiled with mysql support - (type "para_client si" to find out) - - the user who runs para_client has the paraslash AFS_WRITE - and AFS_READ permissions set in server.users - - the user who runs para_server has create privileges on the - mysql server. - -Remember: If something doesn't work as expected, look at the server -log file and/or increase output verbosity by using the -l switch for -server and client. - -------------------------------------- -Specify mysql data (port, passwd,...) -------------------------------------- - -Type - - para_server -h - -and look at the mysql options. You may either specify these options -in ~/.paraslash/server.conf or directly at the command line (not -recommended for passwd option). Don't forget to do - - chmod 600 ~/.paraslash/server.conf - -as this file contains the mysql passwd. To make these changes take -effect you'll need to do - - para_client hup - -Or, restart the server. - ---------------------------------------- -Switch to the mysql audio file selector ---------------------------------------- - -The command - - para_client chs - -prints the name of the current selector. Try - - para_client chs mysql - -to switch to the mysql selector. If this doesn't work, it means that -some required config options were not specified (check the log for -more info) or that para_server was built without mysql support. Type - - para_client si - -to find out. If mysql is not mentioned as a supported selector, -you'll have to recompile. If configure does not detect your mysql -installation, use the --with-mysql-headers and --with-mysql-libs -options to specify the mysql path explicitly . Example: - - ./configure --with-mysql-headers=/Library/MySQL/include \ - --with-mysql-libs=/Library/MySQL/lib/mysql - - ---------------------- -Create a new database ---------------------- - -Once the mysql selector is activated, create the database: - - para_client cdb - para_client chs mysql - -The second command forces para_server to re-init the mysql selector. -Check the log. There should not be any warnings or errors. - -------------------------------- -Fill your database with content -------------------------------- - - para_client upd - -Note that the mysql selector assumes that the basenames of your audio -files are unique. If this is not the case, duplicates are ignored. - -If this command fails, it most likely means the audio file directory -(given in the server configuration file) does not exist, is empty, -or not readable. Fix this problem before proceeding. - -The command - - para_client ls - -prints the list of all files known by the mysql selector. If the list -is empty, double check the mysql_audio_file_dir option. - ---------------------------------------- -Create a stream which selects all files ---------------------------------------- - -To keep it simple, let's only define the stream "all_songs". See -below for advanced stream usage. - - para_client stradd all_songs < /dev/null - para_client sl 10 all_songs - -The latter command should show you ten filenames. - ------------------------------- -Change to the all_songs stream ------------------------------- - - para_client cs all_songs - -You should now be able to start streaming with - - para_client play - ---------------- -Attribute usage ---------------- - -An attribute is simply a bit which can be set for each audio file -individually. You may have as many attributes as you like. A new -attribute "test" is created by - - para_client na test - -and - para_client laa - -lists all available attributes. You can set the "test" attribute for -the current audio file by executing - - para_client sa test+ - -or for any particular audio file by - - para_client sa test+ filename - -Unset the attribute "test" for the current audio file with - - para_client sa test- - -and drop the test attribute entirely from the database with - - para_client da test - ------------- -Stream usage ------------- - -A stream is a pair of expressions in terms of attributes and other data -contained in the database. The first, boolian, expression determines -the set of audio files which are admissible in this stream. The second, -integer, expression determines the order in which admissible files -are going to be fed to the audio file sender(s). - -To create a new stream called "my_stream", put arbitrary many (including -none) accept or deny lines and one or zero score lines into some -temporary file, say tmpfile. An accept/deny/score line consists of -an identifier ("accept:", "deny:", or "score:"), followed by an -expression. The command - - para_client stradd my_stream < tmpfile - -adds the stream "my_stream" to the table of streams. - -If the stream definition is really short, you may also just pipe it to -the client rather than using temporary files. Like this: - - echo "$MYSTREAMDEF" | para_client stradd my_stream - - -Example: -~~~~~~~~ - -Assume you already have an attribute "test" and you'd like to to -restrict audio streaming to those files having the "test" attribute -set. Define a new stream "only_test" by - - echo 'accept: IS_SET(test)' | para_client stradd only_test - -Then, after switching to the "only_test" stream with - - para_client cs only_test - -only the desired files are going to be streamed. - -There is no need to keep the temporary files containing the stream -definition since you can always use the strq command to get it back: - - para_client strq only_test - -The accept/deny expressions are used to find out which songs are -permitted. The following four cases are all possible and valid: - - - Neither accept nor deny lines: This selects all songs. - - - Only accept lines: Songs that match at least one accept - expression are accepted, all others are denied: - - accept_expr1 or accept_expr2 or ... - - - Only deny lines: Songs that match at least one deny expression are - denied, all others are accepted: - - not (deny_expr1 or deny_expr2 ...) - - - Both accept and deny lines: A song is accepted if it matches - at least one accept expression, but no deny expression, i.e. - - (accept_expr1 or accept_expr2 or ..) and not - (deny_expr1 or deny_expr2 ..) - -The command - - para_client streams - -lists all available streams and - - para_client strdel streamname - -removes the stream "streamname". - -There are more sophisticated ways to define a stream than just using -one IS_SET() macro as in the example above. Of course, IS_SET(foo) -is true for a given audio file if and only if it has the attribute -"foo" set. Here are some more macros you can use: - - - IS_N_SET(attr): True if attribute attr is not set - - NAME_LIKE(string): True if basename is like (in the sense - of mysql) "string" - - LASTPLAYED(): Expands to number of minutes that are gone - since this audio file has been played (by paraslash). - - NUMPLAYED(): Expands to number of times, the file has - been played. - - PICID(): Expands to the number of the picture which is - associated with this song. - -To give a real-life example, suppose you have already added the -attributes "pop", "rock" with the "na" command. Assume also that you -have set these attributes for some or all of your songs having the -corresponding properties. - -If you like to be waked up in the morning by poprock songs, but you -have some strange feeling telling you that just a few seconds of -Madonna's voice will be enough to mess up your whole day, just write -the lines - - accept: IS_SET(pop) and IS_SET(rock) - deny: NAME_LIKE(%Madonna%) - -to some temporary file "tmp" and do - - para_client stradd wake < tmp - -You can then switch to the new stream with - - para_client cs wake - -or you can let cron do this for you on a daily basis.. - -Accept/deny lines affect only the set of admissible audio files, -but not the order in which these are streamed. That's where the score -expression comes into play. - -------- -Scoring -------- - -You may put a single score line anywhere in the stream definition. If -omitted, the default scoring rule specified in the configuration file -applies. If there is no default scoring rule in the config file either, -the compiled in default is going to be used (see para_server -h). - -Simple examples of scoring rules (either specified in a stream -definition or as the default scoring rule in the config file) include: - - LASTPLAYED()/1440 - -This means that the score of an audio file is just the number of days -that went by since it has been played the last time (one day is 1440 -minutes). In other words, the mysql selector choses that admissible -file which wasn't played for the longest time. - -However, one disadvantage of this scoring sheme is that new files, -once played, are going to be deferred for a possibly very long period -depending on the size of your collection of (admissible) files. Hence -the following scoring rule comes into mind: - - score: -NUMPLAYED() - -since this gives newer files, i.e. files to which you haven't listen to -that often, a higher score than older songs you already know by heart. - -You can also use a combination of these two methods: - - score: LASTPLAYED()/1440 - 10 * NUMPLAYED() - -which subtracts 10 score points for each time paraslash has played -this file. - -Another useful feature for scoring is due to the fact that -"true" expands to one and "false" to zero. So you can also use the -IS_SET/IS_N_SET/NAME_LIKE macros in a score line to give your favorite -band "bar" some extra points: - - score: 40 * IS_SET(foo) + 20 * NAME_LIKE(%bar%) + LASTPLAYED()/1440 - ------- -Images ------- - -The mysql selector can also magage images that, when associated -with one or more audio files, can be displayed by para_sdl_gui and -para_krell. It is also possible to just retrieve the current image via - - para_client pic > filename - -in order to feed it to your favorite tool. Try - - para_client help | grep ^pic - -and read the online help of the shown commands for more information.