adsr-gain-node
Version:
A simple and small nodejs module for creating an adsr gain node
374 lines (317 loc) • 25.3 kB
JavaScript
(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var options = {
attackAmp: {
label: 'Attack Amp',
value: 0.1,
min: 0,
max: 1,
step: 0.001
},
decayAmp: {
label: 'Decay Amp',
value: 0.1,
min: 0,
max: 1,
step: 0.01
},
sustainAmp: {
label: 'Sustain Amp',
value: 0.1,
min: 0,
max: 1,
step: 0.01
},
releaseAmp: {
label: 'Release Amp',
value: 0.1,
min: 0,
max: 1,
step: 0.01
},
attackTime: {
label: 'Attack Time',
value: 0.1,
min: 0,
max: 1,
step: 0.01
},
decayTime: {
label: 'Decay Time',
value: 0.1,
min: 0,
max: 1,
step: 0.01
},
sustainTime: {
label: 'Sustain Time',
value: 0.1,
min: 0,
max: 1,
step: 0.01
},
releaseTime: {
label: 'Release Time',
value: 0.1,
min: 0,
max: 1,
step: 0.01
},
adsrInterval: {
value: 1
}
}
function getAdsrFormHtml (defaultValues) {
setOptionsDefaultValues(defaultValues)
return `
<form id="adsr">
${getAdsrFormParts(options)}
</form>`
}
function setOptionsDefaultValues (values) {
for(var i in values) {
options[i].value = values[i]
}
}
function getAdsrFormParts(options) {
var str = '';
for(var name in options) {
if (name == 'adsrInterval') {
str += getAdsrFormPartAdsrInterval(options);
} else {
str += getAdsrFormPart(name, options[name]);
}
}
return str;
}
function getAdsrFormPartAdsrInterval (options) {
return `
<div>
<span class="adsr-label">Time interval</span>
<input
name="adsrInterval"
id="adsr-interval"
size="1"
type="text"
maxlength="4"
value="${options.adsrInterval.value}" />
<span> second(s)</span>
</div>
`;
}
function getAdsrFormPart(name, option) {
return `
<div>
<span class="adsr-label">${option.label}</span>
<span class="adsr-input">
<input
name = "${name}"
type="range"
max="${option.max}"
min="${option.min}"
step="${option.step}"
value="${option.value}"
>
</span>
</div>
`;
}
function adsrPreventSubmit () {
var elem = document.getElementById('adsr-interval');
elem.addEventListener('keydown' , function (e) {
if (e.keyIdentifier == 'U+000A' || e.keyIdentifier == 'Enter' || e.keyCode == 13) {
e.preventDefault();
}
});
}
function getAdsrTimeInterval () {
var interval = document.getElementById('adsr-interval').value
interval = parseFloat(interval)
if (!interval) {
interval = 1;
}
return interval;
}
function getFormValuesRaw () {
var values = getFormValues('raw');
// values.timeInterval = getTimeInterval();
return values;
}
function getFormValues (raw) {
var elems = document.getElementById("adsr").elements;
var interval = getAdsrTimeInterval();
var ret = {};
for(var i = 0; i < elems.length; i++ ) {
var name = elems[i].name;
var value = parseFloat(elems[i].value);
if (value == 0) {
value = 0.0001
}
ret[name] = value
if (raw) continue;
if (name == 'sustainTime' ||
name == 'releaseTime' ||
name == 'decayTime' ||
name == 'attackTime') {
ret[name] = interval * ret[name]
}
}
return ret;
}
function insertHTML (elem, defaultValues) {
var adsrHtml = getAdsrFormHtml(defaultValues);
elem.insertAdjacentHTML( 'afterbegin', adsrHtml);
adsrPreventSubmit()
}
module.exports.insertHTML = insertHTML
module.exports.getFormValues = getFormValues
module.exports.getFormValuesRaw = getFormValuesRaw
},{}],2:[function(require,module,exports){
function AdsrGainNode(ctx) {
this.ctx = ctx;
this.mode = 'exponentialRampToValueAtTime';
// this.mode = 'linearRampToValueAtTime';
this.options = {
attackAmp: 0.1,
decayAmp: 0.3,
sustainAmp: 0.7,
releaseAmp: 0.01,
attackTime: 0.1,
decayTime: 0.2,
sustainTime: 1.0,
releaseTime: 3.4,
autoRelease: true
};
/**
* Set options or use defaults
* @param {object} options
*/
this.setOptions = function (options) {
this.options = Object.assign(this.options, options);
};
this.gainNode
this.audioTime
/**
* Get a gain node from defined options
* @param {float} audioTime an audio context time stamp
*/
this.getGainNode = (audioTime) => {
this.gainNode = this.ctx.createGain();
this.audioTime = audioTime
// Firefox does not like 0 -> therefor 0.0000001
this.gainNode.gain.setValueAtTime(0.0000001, audioTime)
// Attack
this.gainNode.gain[this.mode](
this.options.attackAmp,
audioTime + this.options.attackTime)
// Decay
this.gainNode.gain[this.mode](
this.options.decayAmp,
audioTime + this.options.attackTime + this.options.decayTime)
// Sustain
this.gainNode.gain[this.mode](
this.options.sustainAmp,
audioTime + this.options.attackTime + this.options.sustainTime)
// Check if auto-release
// Then calculate when note should stop
if (this.options.autoRelease) {
this.gainNode.gain[this.mode](
this.options.releaseAmp,
audioTime + this.releaseTime()
)
// Disconnect the gain node
this.disconnect(audioTime + this.releaseTime())
}
return this.gainNode;
};
/**
* Release the note dynamicaly
* E.g. if your are making a keyboard, and you want the note
* to be released according to current audio time + the ADSR release time
*/
this.releaseNow = () => {
this.gainNode.gain[this.mode](
this.options.releaseAmp,
this.ctx.currentTime + this.options.releaseTime)
this.disconnect(this.options.releaseTime)
}
/**
* Get release time according to the adsr release time
*/
this.releaseTime = function() {
return this.options.attackTime + this.options.decayTime + this.options.sustainTime + this.options.releaseTime
}
/**
* Get release time according to 'now'
*/
this.releaseTimeNow = function () {
return this.ctx.currentTime + this.releaseTime()
}
/**
*
* @param {float} disconnectTime the time when gainNode should disconnect
*/
this.disconnect = (disconnectTime) => {
setTimeout( () => {
this.gainNode.disconnect();
},
disconnectTime * 1000);
};
}
module.exports = AdsrGainNode;
},{}],3:[function(require,module,exports){
var adsrGainNode = require('./index')
var adsrForm = require('./adsrForm')
var audioCtx = new AudioContext();
var oscillator = audioCtx.createOscillator();
// Helper function to get new gain node
function getADSR () {
let adsr = new adsrGainNode(audioCtx);
let options = adsrForm.getFormValues()
adsr.setOptions(options)
console.log(adsrForm.getFormValuesRaw())
return adsr
}
// Begin time for gain
var nowTime = audioCtx.currentTime
function playNoteIn (inTime) {
if(audioCtx.state === 'suspended') {
audioCtx.resume().then(function() {
console.log('Resumed')
});
}
let adsr = getADSR()
let gainNode = adsr.getGainNode(audioCtx.currentTime + inTime );
let oscillator = audioCtx.createOscillator();
// Connect the oscillator to the gain node
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
// Start
oscillator.start(audioCtx.currentTime + inTime);
// Stop oscillator according to the ADSR
let endTime = adsr.releaseTime() + audioCtx.currentTime
oscillator.stop(endTime)
}
var defaultValues = {
attackAmp: 0.1,
decayAmp: 0.3,
sustainAmp: 0.7,
releaseAmp: 0.01,
attackTime: 0.1,
decayTime: 0.2,
sustainTime: 1.0,
releaseTime: 0.1,
adsrInterval: 2.1,
// all above values are between 0 and 1.
// Except adsrInterval which are multiplied
// With the time constants.
};
document.addEventListener("DOMContentLoaded", function(event) {
var elem = document.getElementById('adsr-parent')
adsrForm.insertHTML(elem, defaultValues)
var play = document.getElementById('play')
play.addEventListener('click', function () {
playNoteIn(0)
})
});
},{"./adsrForm":1,"./index":2}]},{},[3])
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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","var options = {\n    attackAmp: {\n        label: 'Attack Amp',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.001\n    },\n    decayAmp: { \n        label: 'Decay Amp',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.01\n    },\n    sustainAmp: { \n        label: 'Sustain Amp',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.01\n    },\n    releaseAmp: { \n        label: 'Release Amp',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.01\n    },\n    attackTime: { \n        label: 'Attack Time',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.01\n    },\n    decayTime: { \n        label: 'Decay Time',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.01\n    },\n    sustainTime: { \n        label: 'Sustain Time',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.01\n    }, \n    releaseTime: { \n        label: 'Release Time',\n        value: 0.1, \n        min: 0,\n        max: 1,\n        step: 0.01\n    },\n    adsrInterval: {\n        value: 1\n    }\n}\n\nfunction getAdsrFormHtml (defaultValues) {\n\n    setOptionsDefaultValues(defaultValues)\n\n    return `\n    <form id=\"adsr\">\n        ${getAdsrFormParts(options)}\n    </form>`\n}\n\nfunction setOptionsDefaultValues (values) {\n    for(var i in values) {\n        options[i].value = values[i]\n    }\n\n}\n\nfunction getAdsrFormParts(options) {\n    var str = '';\n    for(var name in options) {\n        if (name == 'adsrInterval') {\n            str += getAdsrFormPartAdsrInterval(options);\n        } else {\n            str += getAdsrFormPart(name, options[name]);\n        }\n    }\n\n    return str;\n}\n\nfunction getAdsrFormPartAdsrInterval (options) {\n    return `\n    <div>\n        <span class=\"adsr-label\">Time interval</span>\n        <input \n            name=\"adsrInterval\" \n            id=\"adsr-interval\" \n            size=\"1\" \n            type=\"text\" \n            maxlength=\"4\" \n            value=\"${options.adsrInterval.value}\" />\n        <span> second(s)</span>\n    </div>\n    `;\n}\n\nfunction getAdsrFormPart(name, option) {\n    return `\n    <div>\n        <span class=\"adsr-label\">${option.label}</span>\n        <span class=\"adsr-input\">\n            <input \n                name = \"${name}\" \n                type=\"range\" \n                max=\"${option.max}\" \n                min=\"${option.min}\" \n                step=\"${option.step}\" \n                value=\"${option.value}\"\n            >\n        </span>\n    </div>\n    `;\n}\n\nfunction adsrPreventSubmit () {\n\n    var elem = document.getElementById('adsr-interval');\n    elem.addEventListener('keydown' , function (e) {\n        if (e.keyIdentifier == 'U+000A' || e.keyIdentifier == 'Enter' || e.keyCode == 13) {\n            e.preventDefault();\n        }\n    });\n}\n\nfunction getAdsrTimeInterval () {\n    var interval = document.getElementById('adsr-interval').value\n    interval = parseFloat(interval)\n    if (!interval) {\n        interval = 1;\n    }\n    return interval;\n}\n\nfunction getFormValuesRaw () {\n    var values = getFormValues('raw');\n    // values.timeInterval = getTimeInterval();\n    return values;\n}\n\nfunction getFormValues (raw) {\n    var elems = document.getElementById(\"adsr\").elements;\n    \n    var interval = getAdsrTimeInterval();\n\n    var ret = {};\n    for(var i = 0; i < elems.length; i++ ) {\n        var name = elems[i].name;\n        var value = parseFloat(elems[i].value);\n        if (value == 0) {\n            value = 0.0001\n        }\n\n        ret[name] = value\n        if (raw) continue;\n\n        if (name == 'sustainTime' || \n            name == 'releaseTime'  || \n            name == 'decayTime' || \n            name == 'attackTime') {\n            ret[name] = interval * ret[name]\n        }\n    }\n    return ret;\n}\n\nfunction insertHTML (elem, defaultValues) {\n    var adsrHtml = getAdsrFormHtml(defaultValues);\n    elem.insertAdjacentHTML( 'afterbegin', adsrHtml);\n    adsrPreventSubmit()\n}\n\n\nmodule.exports.insertHTML = insertHTML\nmodule.exports.getFormValues = getFormValues\nmodule.exports.getFormValuesRaw = getFormValuesRaw\n\n","function AdsrGainNode(ctx) {\n\n    this.ctx = ctx;\n\n    this.mode = 'exponentialRampToValueAtTime';\n    // this.mode = 'linearRampToValueAtTime';\n\n    this.options = {\n        attackAmp: 0.1, \n        decayAmp: 0.3,\n        sustainAmp: 0.7,\n        releaseAmp: 0.01,\n        attackTime: 0.1,\n        decayTime: 0.2,\n        sustainTime: 1.0, \n        releaseTime: 3.4,\n        autoRelease: true\n    };\n\n    /**\n     * Set options or use defaults\n     * @param {object} options \n     */\n    this.setOptions = function (options) {\n        this.options = Object.assign(this.options, options);\n    };\n\n    this.gainNode\n    this.audioTime\n    \n    /**\n     * Get a gain node from defined options\n     * @param {float} audioTime an audio context time stamp\n     */\n    this.getGainNode =  (audioTime) => {\n\n        this.gainNode = this.ctx.createGain();\n        this.audioTime = audioTime\n\n        // Firefox does not like 0 -> therefor 0.0000001\n        this.gainNode.gain.setValueAtTime(0.0000001, audioTime)        \n        \n        // Attack\n        this.gainNode.gain[this.mode](\n            this.options.attackAmp, \n            audioTime + this.options.attackTime)\n\n        // Decay\n        this.gainNode.gain[this.mode](\n            this.options.decayAmp, \n            audioTime + this.options.attackTime + this.options.decayTime)\n\n        // Sustain\n        this.gainNode.gain[this.mode](\n            this.options.sustainAmp, \n            audioTime + this.options.attackTime + this.options.sustainTime)\n \n        // Check if auto-release\n        // Then calculate when note should stop\n        if (this.options.autoRelease) {\n            this.gainNode.gain[this.mode](\n                this.options.releaseAmp,\n                audioTime + this.releaseTime()\n            )\n            \n            // Disconnect the gain node \n            this.disconnect(audioTime + this.releaseTime())\n        }\n        return this.gainNode;\n    };\n\n    /**\n     * Release the note dynamicaly\n     * E.g. if your are making a keyboard, and you want the note\n     * to be released according to current audio time + the ADSR release time \n     */\n    this.releaseNow = () => {\n        this.gainNode.gain[this.mode](\n            this.options.releaseAmp,\n            this.ctx.currentTime + this.options.releaseTime) \n        this.disconnect(this.options.releaseTime)\n    }\n\n    /**\n     * Get release time according to the adsr release time\n     */\n    this.releaseTime = function() {\n        return this.options.attackTime + this.options.decayTime + this.options.sustainTime + this.options.releaseTime\n    }\n\n    /**\n     * Get release time according to 'now'\n     */\n    this.releaseTimeNow = function () {\n        return this.ctx.currentTime + this.releaseTime()\n    }\n    \n    /**\n     * \n     * @param {float} disconnectTime the time when gainNode should disconnect \n     */\n    this.disconnect = (disconnectTime) => {\n        setTimeout( () => {\n            this.gainNode.disconnect();\n        },\n        disconnectTime * 1000);\n    };\n}\n\nmodule.exports = AdsrGainNode;\n","var adsrGainNode = require('./index')\nvar adsrForm = require('./adsrForm')\n\nvar audioCtx = new AudioContext();\nvar oscillator = audioCtx.createOscillator();\n\n// Helper function to get new gain node\nfunction getADSR () {\n    let adsr = new adsrGainNode(audioCtx);\n    let options = adsrForm.getFormValues()\n    adsr.setOptions(options)\n    console.log(adsrForm.getFormValuesRaw())\n    return adsr\n}\n\n// Begin time for gain\nvar nowTime = audioCtx.currentTime\n\nfunction playNoteIn (inTime) {\n\n    if(audioCtx.state === 'suspended') {\n        audioCtx.resume().then(function() {\n            console.log('Resumed')\n        });\n    }\n\n    let adsr = getADSR()\n    let gainNode = adsr.getGainNode(audioCtx.currentTime + inTime );\n\n    let oscillator = audioCtx.createOscillator();\n\n    // Connect the oscillator to the gain node\n    oscillator.connect(gainNode);\n    gainNode.connect(audioCtx.destination);\n\n    // Start\n    oscillator.start(audioCtx.currentTime + inTime);\n\n    // Stop oscillator according to the ADSR\n    let endTime = adsr.releaseTime() + audioCtx.currentTime\n    oscillator.stop(endTime)\n}\n\nvar defaultValues = {\n    attackAmp: 0.1, \n    decayAmp: 0.3,\n    sustainAmp: 0.7,\n    releaseAmp: 0.01,\n    attackTime: 0.1,\n    decayTime: 0.2,\n    sustainTime: 1.0, \n    releaseTime: 0.1,\n    adsrInterval: 2.1, \n    // all above values are between 0 and 1.\n    // Except adsrInterval which are multiplied\n    // With the time constants.\n};\n\ndocument.addEventListener(\"DOMContentLoaded\", function(event) { \n    var elem = document.getElementById('adsr-parent')\n    adsrForm.insertHTML(elem, defaultValues)\n\n    var play = document.getElementById('play')\n    play.addEventListener('click', function () {\n        playNoteIn(0)\n    })\n});\n"]}