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MUD Sound Protocol (MSP)

The MUD Sound Protocol (MSP) was developed jointly between many people, including implementers of various MUDs and MUD clients. Leading the MSP design effort was  Medievia MUD and the zMUD and MUD Master MUD clients.  This document provides the complete MSP specification, as well as zMUD implementation notes.

List of MUDs with MSP support
List of MUD Clients with MSP support
MSP specification
zMUD Implementation notes


MSP Specification v0.3

Changes from v0.2:
Added U=URL optional parameter for !!SOUND and !!MUSIC to download sounds via the web

!!SOUND:

Syntax:
!!SOUND(fname V=vol L=repeats P=priority T=type U=URL)
Where:
"fname" is the name of the sound file to be played
"vol" is the volume level to play the sound at
"repeats" is the number of times to play the sound
"priority" is the priority of the sound
"type" is the sound class
"URL" is the optional download URL for the sound file

Parameters:

fname:
"fname" may contain relative path information and wildcards, but may not contain absolute path information. Any directory information should be specified using "/" rather than "\", since this avoids all of those nasty problems with escape characters. If multiple wave files match a wildcard, one of them should be chosen at random. Wildcards should work just like DOS wildcards; * should match the remainder of the file name, and ? should match exactly one character. If no extension is specified, ".wav" should be assumed.
Following are some valid fname values:
weather/thund*
lightning.wav
zone231/room22.wav
And some invalid ones:
weather\lightning.wav # uses \ rather than /
*x*.wav # wildcards stop after the first *
c:\sounds\m.wav # no absolute paths
vol:
"vol" may range from 0 (0%, off) to 100 (100%, full). This parameter may be omitted, in which case it defaults to 100.
repeats:
"repeats" controls the number of times to play the sound. It may be omitted, in which case it defaults to 1. It may also be set to -1, which causes sounds to be looped until otherwise instructed.
priority:
"priority" is the priority of the sound. If a sound is requested while another sound is being played, whichever sound has the higher priority wins. In the case of a tie, the sound that is already playing wins. This is to prevent combat sounds from degenerating into a mishmash of sound fragments. Priority may range from 0 to 100, and defaults to 50 if not set.
type:
The class of the sound. This is mud specific. Some example classes might be combat, zone, death, clan. This parameter may be omitted, but if a MUD opts to use it, it's recommended that it be used everywhere. The actual type is a string, and should be case insensitive.  If this parameter is omitted, the subdirectory of the fName is used as the class.
URL:
The URL is used to download the sound if it does not exist on the local system.  If can be a full URL for the file, or a URL path to which the fname is appended.  Using a global path and putting the subdirectory information into the fName is a good way to maintain a directory structure on both the web server and the local disk. 

Notes:

  1. If a wildcard pattern is requested for multiple repeats, the actual sound played should be picked randomly for each iteration.
  2. The sound name Off is reserved, and should cause all wave files to stop playing.

Examples:

!!SOUND(thunder V=100 L=1 P=30 T=weather)
!!SOUND(weather/rain.wav V=80 P=20 T=weather)
!!SOUND(alarm P=100 T=utility)
!!SOUND(Off)

!!MUSIC:

Syntax:
!!MUSIC(fname V=vol L=repeats C=continue T=type U=URL)
Where:
"fname" is the name of the music file to be played
"vol" is the volume level to play the music at "repeats" is the number of times to play the music file
"continue" specifies whether the file should be restarted if requested again
"type" is the sound class
"URL" is the optional download URL for the sound file

Parameters:

fname:
"fname" may contain relative path information and wildcards, but may not contain absolute path information. Any directory information should be specified using "/" rather than "\", since this avoids all of those nasty problems with escape characters. If multiple music files match a wildcard, one of them should be chosen at random. Wildcards should work just like DOS wildcards; * should match the remainder of the file name, and ? should match exactly one character. If no extension is specified, ".mid" should be assumed.
Following are some valid fname values:
bach/fugue*.mid
zone231/room22.mid
And some invalid ones:
tchai\1812.mid # uses \ rather than /
*x*.mid # wildcards stop after the first *
c:\midi\m.mid # no absolute paths
vol:
"vol" may range from 0 (0%, off) to 100 (100%, full). This parameter may be omitted, in which case it defaults to 100.
repeats:
"repeats" controls the number of times to play the sound. It may be omitted, in which case it defaults to 1. It may also be set to -1, which causes the midi file to be looped continuously until otherwise instructed.
continue:
"continue" specifies whether the file should simply continue playing if requested again (1), or if it should restart (0). In either case, the new repeat count should take precedence over the old one, and the "number of plays thus far" counter should be reset to 0. By way of illustration, assume two rooms, room 110, and room 111. Room 110 is set to play bach/fugue.mid 3 times, while room 111 is set to play bach/fugue.mid 5 times. If a character enters room 110, fugue starts playing; if during halfway through the second refrain the character moves to room 111, fugue would either continue or restart based on the continue setting. fugue should play either 4.5 times (if continue was 1) or 5 times (if continue was 0). Similarly, the volume of the most recent MUSIC escape should be used. If "continue" isn't specified, it defaults to 1.
type:
The class of the sound. This is mud specific. Some example classes might be combat, zone, death, clan. This parameter may be omitted, but if a MUD opts to use it, it's recommended that it be used everywhere. The actual type is a string, and should be case insensitive. If this parameter is omitted, the subdirectory of the fName is used as the class.
URL:
The URL is used to download the sound if it does not exist on the local system.  If can be a full URL for the file, or a URL path to which the fname is appended.  Using a global path and putting the subdirectory information into the fName is a good way to maintain a directory structure on both the web server and the local disk. 

Notes:

  1. If a wildcard pattern is requested for multiple repeats, the actual music file played should be picked randomly for each iteration.
  2. The music name Off is reserved, and should cause all midi files to stop playing.

Examples:

!!MUSIC(fugue.mid V=100 L=1 C=1 T=music)
!!MUSIC(berlioz/fantas1 V=80 L=-1 C=1 T=music)
!!MUSIC(Off)


This page last updated on July 25, 2001