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/*
* Webchat WebRTC application
* https://arthurdejong.org/webchat/
* Parts of this file were part of the Simple volume meter
* https://github.com/cwilso/volume-meter/
*
*
* Copyright (c) 2014 Chris Wilson
* Copyright (C) 2020 Arthur de Jong
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE
*/
(function (root, factory) {
/* if (typeof define === 'function' && define.amd) {
// AMD: register as an anonymous module
define(['jquery'], function (jquery) { return (root.volumeindicator = factory(jquery)) })
} else */ if (typeof module === 'object' && module.exports) {
// Node: only works with CommonJS-like environments that support module.exports
module.exports = factory(require('jquery'))
} else {
// Browser globals
root.volumeindicator = factory(root.jQuery)
}
}(typeof self !== 'undefined' ? self : this, function ($) {
class VolumeIndicator {
constructor(element, stream, options) {
this.element = $(element)
element.volumeindicator = this
function volumeAudioProcess(event) {
var buf = event.inputBuffer.getChannelData(0)
var bufLength = buf.length
var sum = 0
var x
// Do a root-mean-square on the samples: sum up the squares...
for (var i = 0; i < bufLength; i++) {
x = buf[i]
if (Math.abs(x) >= this.clipLevel) {
this.clipping = true
this.lastClip = window.performance.now()
}
sum += x * x
}
// ... then take the square root of the sum.
var rms = Math.sqrt(sum / bufLength)
// Now smooth this out with the averaging factor applied
// to the previous sample - take the max here because we
// want "fast attack, slow release."
this.volume = Math.max(rms, this.volume * this.averaging)
}
function createAudioMeter(audioCtx, clipLevel, averaging, clipLag) {
var processor = audioCtx.createScriptProcessor(512)
processor.onaudioprocess = volumeAudioProcess
processor.clipping = false
processor.lastClip = 0
processor.volume = 0
processor.clipLevel = clipLevel || 0.98
processor.averaging = averaging || 0.95
processor.clipLag = clipLag || 750
// this will have no effect, since we don't copy the input to the output,
// but works around a current Chrome bug.
processor.connect(audioCtx.destination)
processor.checkClipping =
function () {
if (!this.clipping) { return false }
if ((this.lastClip + this.clipLag) < window.performance.now()) { this.clipping = false }
return this.clipping
}
processor.shutdown =
function () {
this.disconnect()
this.onaudioprocess = null
}
return processor
}
// connect the stream to the meter
var audioCtx = new AudioContext()
var source = audioCtx.createMediaStreamSource(stream)
var meter = createAudioMeter(audioCtx)
source.connect(meter)
this.meter = meter
}
}
// update the volume indicator on regular intervals
setInterval(function () {
$('video').each(function () {
var volume = $(this).siblings('.volume')
var volumeindicator = $(this).data('volumeindicator')
if (volumeindicator) {
// check if we're currently clipping
if (volumeindicator.meter.checkClipping()) {
volume.removeClass('bg-info')
volume.addClass('bg-warning')
$(this).removeClass('border-dark')
$(this).addClass('border-warning')
} else {
volume.removeClass('bg-warning')
volume.addClass('bg-info')
$(this).removeClass('border-warning')
if (volumeindicator.meter.volume > 0.1) {
$(this).removeClass('border-dark')
$(this).addClass('border-info')
} else {
$(this).removeClass('border-info')
$(this).addClass('border-dark')
}
}
volume.css('height', Math.round(volumeindicator.meter.volume * 140 + 5) + '%')
} else {
volume.css('height', 0)
}
})
}, 500)
$.fn.volumeindicator = function (stream, options) {
this.each(function () {
var element = $(this)
if (element.data('volumeindicator')) { element.data('volumeindicator').remove() }
element.data('volumeindicator', new VolumeIndicator(element, stream, options))
})
return this
}
return VolumeIndicator
}))
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