52 lines
1.9 KiB
Plaintext
52 lines
1.9 KiB
Plaintext
# Midifile.js
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This module parses the Standard Midi File.
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The code was modified to adapt to the 'require' way of nodejs. Irrelevant code have been removed.
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The SMF parser part of the jasmid project is used. See jasmid's README and LICENSE for more info
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Jasmid's original repository: https://github.com/gasman/jasmid
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# JASMID Original Readme
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```
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jasmid - A Javascript MIDI file reader and synthesiser
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Originally presented at BarCamp London 8, 13-14 November 2010
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Instructions:
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Open index.html in browser. Turn up volume. Click on link.
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Sound output is via one of the following mechanisms, according to what your
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browser supports:
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* Mozilla Audio Data API <https://wiki.mozilla.org/Audio_Data_API>
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* Web Audio API
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<https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html>
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* a Flash fallback originally taken from dynamicaudio.js by Ben Firshman
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<https://github.com/bfirsh/dynamicaudio.js> and hacked around by me.
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The code:
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stream.js - helper library for reading a string as a stream of typed data
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midifile.js - parses the MIDI file format into a header and a list of tracks,
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each consisting of a list of event objects
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replayer.js - steps over the data structure generated by midifile.js and calls
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the appropriate operations on the synthesiser
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synth.js - audio synthesiser; generates waveforms according to tweakable
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parameters
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audio.js - passes the generated waveform to either the Audio Data API or the
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Flash fallback widget (da.swf)
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Limitations:
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* The only event types supported by replayer.js are note on, note off, tempo
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change and program change
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* There are currently only two instrument presets defined in synth.js - one for
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strings and a 'piano' one for everything else - and neither of them are
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particularly good (just a single volume-modulated sine wave).
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Matt Westcott <matt@west.co.tt> - @gasmanic - http://matt.west.co.tt/
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```
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