Command-line utility and Node module for generating raw audio data from MIDI files.
$ npm link synth-js$ npm install --save synth-js<script src="synth.min.js"></script>After including the file from dst/synth.min.js, the global variable synth will be initialized.
# assuming song.mid in cwd $ synth -i song # now song.wav contains raw audio data for song.midconst synth = require('synth-js'); const fs = require('fs'); let midBuffer = fs.readFileSync('song.mid'); // convert midi buffer to wav buffer let wavBuffer = synth.midiToWav(midiBuffer).toBuffer(); fs.writeFileSync('song.wav', wavBuffer, {encoding: 'binary'});<style> #wav:after { content: " " attr(download); } #wav:not([href]) { display: none; } </style> <input type="file" id="midi" accept="audio/midi"> <a id="wav">Download</a> <script> var audio; var input = document.getElementById('midi'); var anchor = document.getElementById('wav'); input.addEventListener('change', function change() { // clean up previous song, if any if (anchor.hasAttribute('href')) { URL.revokeObjectURL(anchor.href); anchor.removeAttribute('href'); if (audio && !audio.paused) { audio.pause(); } } // check if file exists if (input.files.length > 0) { var reader = new FileReader(); var midName = input.files[0].name; // replace file extension with .wav var wavName = midName.replace(/\..+?$/, '.wav'); // set callback for array buffer reader.addEventListener('load', function load(event) { // convert midi arraybuffer to wav blob var wav = synth.midiToWav(event.target.result).toBlob(); // create a temporary URL to the wav file var src = URL.createObjectURL(wav); audio = new Audio(src); audio.play(); anchor.setAttribute('href', src); }); // read the file as an array buffer reader.readAsArrayBuffer(input.files[0]); // set the name of the wav file anchor.setAttribute('download', wavName); } }); </script>See the demo here.
Currently, documentation only exists for the command-line utility. To access it, use man:
$ man synthFor Node or JavaScript, refer to the src/ directory for accessible APIs:
synth.WAV()synth.MIDIStream()synth.midiToWav()
Available under the MIT License
