Форматы файлов ритм-игр Beatmania: BMS и bmson

Beatmania (rhythm game) file format

BMS is a file format for rhythm games developed by Urao Yane in 1998. The format was originally developed for BM98 (a simulator of the game Beatmania by Konami), though the term BMS is now widely used to describe the Beatmania esque music data system in general. The acronym has been confirmed by Yane to be Be Music Source in the official BMS format specification.

Similar to the Beatmania and Beatmania IIDX series, the purpose of the game is to hit notes as they descend from the top of the screen. When the player hits notes with the proper timing, a gauge will fill up. When the player misses a note, the gauge will drain. In addition to normal notes, there are also long notes that must be held, and mine notes that will explode and drain the gauge if hit. To clear the game, the player's gauge must be filled to a specified level at the end of the song.

Main field data is written in the form of #XXXYY:ZZZZZZ. XXX defines the number of the measure, YY defines the channel, and ZZ defines the components of the measure using a base 36 2 digit number. The colon separating the definer and components is required.

bmson is a JSON based format initially developed by wosderge. The original purpose of the format was to make an alternative to BMS that was easy to implement and use by developers, artists and chart creators alike. bmson has no limit on the amount of key sounds one can have in a chart, unlike BMS, which has a hard limit of 1296 key sounds. After the format was proposed, the version 0.26 format was implemented to a couple of BMS players, such as Bemuse and raindrop. After bmson's initial implementation, the developers of these games, as well as a few others, worked together to create the bmson version 1.0 technical specification.