z-music.js - AudioProcessorNode can do it
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z-music.js introduction and design overview
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z-music.js - AudioProcessorNode can do it
- 1. z-music.js : AudioProcessorNode can do it A ♪ SOUND mind in a SOUND <body> Takashi Toyoshima <toyoshim@gmail.com>
- 2. Z-MUSIC ● MML based music sequencer for OPM + ADPCM + MIDI ● For X68000 series Glossary ● MML Music Macro Language ● OPM FM Operator Type-M; 8ch x 4op FM sound chip ● ADPCM Adaptive Differential Pulse Code Modulation ● MIDI Musical Instrument Digital Interface ● X68000 Personal Workstation by SHARP (1987-1993)
- 3. MML example /-----------------------------------------------------------------------/ Synth Bass (t3) v15 l16 @3 o1 r2. g8.&(g,d)e2...ee2. Bb-ag [do] |:|:e8.e8.g8a8.b8.g8 e8.e8.e8|r4.<de>:|r|brb-rag8:|ererg8. |:e8.e8.g8a8.b8.g8e8.e8.e8|r4.<de>:|rararb8. g8.g8.a8r(f,b)&b8a8g8 e8.e8.e8r16(f,g)&g8d8.&(d,>a) <(g,a)&a8a8.a8r(a,b)&b8(a,b)&b16<d8>g8.g8.a8b8.<d8.gf+> e8.e8.e8r4(f,g)&g8&(g,e) a8.a8.a8(f,g)&g8.a8.&(a,f) g8.g8.a8rb8.aged e8.e8.e8r8<ded>bag e8.e8.e8r4.<de>e8.e8.e8r4.<de> [loop]
- 4. Demo
- 5. Design Overview ScriptProcessorNode AudioDestinationNode audioprocess Event Compiled by Emscripten X68Sound.dll (OPM+ADPCM emulation) call S16 PCM Stream Run68 (human68k emulator)Virtual Timer Callback ZMUSIC.XOPM+ADPCM wapped I/O Access Web MIDI API
- 6. (Bad) Knowhow ● manage JavaScript main thread carefully not to be busy ○ Buffer size 2048 => per ~42msec (≒2-3 frame); GC could be critical on slow machines ○ FYI: X68Sound + run68 takes 1-2 msec to handle the audioprocess callback ■ Pre-rendering technique may help, but could not be a perfect solution ● No good workaround ○ Worker ■ Can delegate rendering tasks, but data should be still transferred to AudioProcessorNode on the main thread ○ iframe ■ Still share the same thread for main threads for main frame and sub iframes ● Though Chrome will have per-origin process in the future ○ Audio Worklet ■ Still under discussion / implementation
- 7. Resources Article（Qiita） A ♪ SOUND mind in a SOUND <body> : Z-MUSIC for the Web Development (GitHub) https://github.com/toyoshim/z-music.js Demo Application https://bit.ly/sion2