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November 24, 2020 12:22
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Data sonification service client / index.html
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<HTML> | |
<HEAD> | |
<TITLE>Sonification Service</TITLE> | |
<script src='WebAudioFontPlayer.js'></script> | |
<script src='MIDIFile.js'></script> | |
</HEAD> | |
<BODY onload="onPageLoad()"> | |
<H1>Data</H1> | |
<DIV ID="dataDiv"> | |
</DIV> | |
</BODY> | |
<SCRIPT TYPE="text/javascript"> | |
function onPageLoad() { | |
var source = new EventSource("/logmonitor/application/appA/sonify"); | |
source.onmessage = function(event) { | |
var data = event.data; | |
if(data.indexOf('base64')!=-1){ | |
var base64 = data.split('base64=')[1]; | |
handleExamplePlay(base64); | |
}else{ | |
document.getElementById("dataDiv").innerHTML += data + "<br>"; | |
} | |
}; | |
} | |
console.log('start'); | |
var audioContext = null; | |
var player = null; | |
var reverberator = null; | |
var songStart = 0; | |
var input = null; | |
var currentSongTime = 0; | |
var nextStepTime = 0; | |
var nextPositionTime = 0; | |
var loadedsong = null; | |
function startPlay(song) { | |
currentSongTime = 0; | |
songStart = audioContext.currentTime; | |
nextStepTime = audioContext.currentTime; | |
var stepDuration = 44 / 1000; | |
tick(song, stepDuration); | |
} | |
function tick(song, stepDuration) { | |
if (audioContext.currentTime > nextStepTime - stepDuration) { | |
sendNotes(song, songStart, currentSongTime, currentSongTime + stepDuration, audioContext, input, player); | |
currentSongTime = currentSongTime + stepDuration; | |
nextStepTime = nextStepTime + stepDuration; | |
} | |
if (nextPositionTime < audioContext.currentTime) { | |
nextPositionTime = audioContext.currentTime + 3; | |
} | |
window.requestAnimationFrame(function (t) { | |
if (currentSongTime < song.duration) { | |
tick(song, stepDuration); | |
} | |
}); | |
} | |
function sendNotes(song, songStart, start, end, audioContext, input, player) { | |
for (var t = 0; t < song.tracks.length; t++) { | |
var track = song.tracks[t]; | |
for (var i = 0; i < track.notes.length; i++) { | |
if (track.notes[i].when >= start && track.notes[i].when < end) { | |
var when = songStart + track.notes[i].when; | |
var duration = track.notes[i].duration; | |
if (duration > 3) { | |
duration = 3; | |
} | |
var instr = track.info.variable; | |
var v = track.volume / 7; | |
player.queueWaveTable(audioContext, input, window[instr], when, track.notes[i].pitch, duration, v, track.notes[i].slides); | |
} | |
} | |
} | |
for (var b = 0; b < song.beats.length; b++) { | |
var beat = song.beats[b]; | |
for (var i = 0; i < beat.notes.length; i++) { | |
if (beat.notes[i].when >= start && beat.notes[i].when < end) { | |
var when = songStart + beat.notes[i].when; | |
var duration = 1.5; | |
var instr = beat.info.variable; | |
var v = beat.volume / 2; | |
player.queueWaveTable(audioContext, input, window[instr], when, beat.n, duration, v); | |
} | |
} | |
} | |
} | |
function startLoad(song) { | |
console.log(song); | |
var AudioContextFunc = window.AudioContext || window.webkitAudioContext; | |
audioContext = new AudioContextFunc(); | |
player = new WebAudioFontPlayer(); | |
reverberator = player.createReverberator(audioContext); | |
reverberator.output.connect(audioContext.destination); | |
input = reverberator.input; | |
for (var i = 0; i < song.tracks.length; i++) { | |
var nn = player.loader.findInstrument(song.tracks[i].program); | |
var info = player.loader.instrumentInfo(nn); | |
song.tracks[i].info = info; | |
song.tracks[i].id = nn; | |
player.loader.startLoad(audioContext, info.url, info.variable); | |
} | |
for (var i = 0; i < song.beats.length; i++) { | |
var nn = player.loader.findDrum(song.beats[i].n); | |
var info = player.loader.drumInfo(nn); | |
song.beats[i].info = info; | |
song.beats[i].id = nn; | |
player.loader.startLoad(audioContext, info.url, info.variable); | |
} | |
player.loader.waitLoad(function () { | |
startPlay(song); | |
}); | |
} | |
function handleExamplePlay(base64) { | |
var arrayBuffer = _base64ToArrayBuffer(base64); | |
var midiFile = new MIDIFile(arrayBuffer); | |
var song = midiFile.parseSong(); | |
startLoad(song); | |
} | |
function _base64ToArrayBuffer(base64_string) { | |
var byteArray = Base64Binary.decodeArrayBuffer(base64_string); | |
return byteArray; | |
} | |
/* | |
Copyright (c) 2011, Daniel Guerrero | |
All rights reserved. | |
Redistribution and use in source and binary forms, with or without | |
modification, are permitted provided that the following conditions are met: | |
* Redistributions of source code must retain the above copyright | |
notice, this list of conditions and the following disclaimer. | |
* Redistributions in binary form must reproduce the above copyright | |
notice, this list of conditions and the following disclaimer in the | |
documentation and/or other materials provided with the distribution. | |
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND | |
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
DISCLAIMED. IN NO EVENT SHALL DANIEL GUERRERO BE LIABLE FOR ANY | |
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
/** | |
* Uses the new array typed in javascript to binary base64 encode/decode | |
* at the moment just decodes a binary base64 encoded | |
* into either an ArrayBuffer (decodeArrayBuffer) | |
* or into an Uint8Array (decode) | |
* | |
* References: | |
* https://developer.mozilla.org/en/JavaScript_typed_arrays/ArrayBuffer | |
* https://developer.mozilla.org/en/JavaScript_typed_arrays/Uint8Array | |
*/ | |
var Base64Binary = { | |
_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", | |
/* will return a Uint8Array type */ | |
decodeArrayBuffer: function(input) { | |
var bytes = (input.length/4) * 3; | |
var ab = new ArrayBuffer(bytes); | |
this.decode(input, ab); | |
return ab; | |
}, | |
removePaddingChars: function(input){ | |
var lkey = this._keyStr.indexOf(input.charAt(input.length - 1)); | |
if(lkey == 64){ | |
return input.substring(0,input.length - 1); | |
} | |
return input; | |
}, | |
decode: function (input, arrayBuffer) { | |
//get last chars to see if are valid | |
input = this.removePaddingChars(input); | |
input = this.removePaddingChars(input); | |
var bytes = parseInt((input.length / 4) * 3, 10); | |
var uarray; | |
var chr1, chr2, chr3; | |
var enc1, enc2, enc3, enc4; | |
var i = 0; | |
var j = 0; | |
if (arrayBuffer) | |
uarray = new Uint8Array(arrayBuffer); | |
else | |
uarray = new Uint8Array(bytes); | |
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); | |
for (i=0; i<bytes; i+=3) { | |
//get the 3 octects in 4 ascii chars | |
enc1 = this._keyStr.indexOf(input.charAt(j++)); | |
enc2 = this._keyStr.indexOf(input.charAt(j++)); | |
enc3 = this._keyStr.indexOf(input.charAt(j++)); | |
enc4 = this._keyStr.indexOf(input.charAt(j++)); | |
chr1 = (enc1 << 2) | (enc2 >> 4); | |
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); | |
chr3 = ((enc3 & 3) << 6) | enc4; | |
uarray[i] = chr1; | |
if (enc3 != 64) uarray[i+1] = chr2; | |
if (enc4 != 64) uarray[i+2] = chr3; | |
} | |
return uarray; | |
} | |
} | |
</SCRIPT> | |
</HTML> |
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