├── index.js
└── package.json


/index.js:
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  1 | /* global Audio, Blob, File, URL */
  2 | const record = require('media-recorder-stream')
  3 | const MediaStream = window.MediaStream || window.webkitMediaStream
  4 | 
  5 | module.exports = function (context) {
  6 | 
  7 |   class MediaStreamWrapper {
  8 |     constructor (stream) {
  9 |       // Hack, but Chrome won't work without this
 10 |       // We never do anything with this node, it's just a workaround
 11 |       let node = new Audio()
 12 |       try {
 13 |         node.src = URL.createObjectURL(stream)
 14 |       } catch (e) {
 15 |         // This fails in some non-Chrome browsers, ignore it.
 16 |       }
 17 | 
 18 |       this.microphone = context.createMediaStreamSource(stream)
 19 |       this.gainFilter = context.createGain()
 20 |       this.destination = context.createMediaStreamDestination()
 21 |       this.microphone.connect(this.gainFilter)
 22 |       this.gainFilter.connect(this.destination)
 23 |       this.stream = this.destination.stream
 24 |     }
 25 |   }
 26 | 
 27 |   class Waudio {
 28 |     constructor () {
 29 |       this.el = new Audio()
 30 |       this.source = context.createMediaElementSource(this.el)
 31 |       this.gainFilter = context.createGain()
 32 |       this.destination = context.createMediaStreamDestination()
 33 |       this.source.connect(this.gainFilter)
 34 |       this.gainFilter.connect(this.destination)
 35 |       this.stream = this.destination.stream
 36 |       this.context = context
 37 |     }
 38 |     connect (dest) {
 39 |       if (dest.gainFilter) dest = dest.gainFilter
 40 |       this.gainFilter.connect(dest)
 41 |     }
 42 |     disconnect (dest) {
 43 |       if (dest && dest.gainFilter) dest = dest.gainFilter
 44 |       this.gainFilter.disconnect(dest)
 45 |     }
 46 |     record (opts) {
 47 |       return record(this.stream, opts)
 48 |     }
 49 |     volume (value) {
 50 |       this.gainFilter.gain.value = value
 51 |     }
 52 |     seek (value) {
 53 |       this.el.currentTime = value
 54 |     }
 55 |     mute () {
 56 |       this._volume = this.gainFilter.gain.value
 57 |       this.volume(0)
 58 |     }
 59 |     unmute () {
 60 |       if (!this._volume) return
 61 |       this.volume(this._volume)
 62 |       this._volume = null
 63 |     }
 64 |     play () {
 65 |       this.el.play()
 66 |     }
 67 |     pause () {
 68 |       this.el.pause()
 69 |     }
 70 |     fadeVolume (value, delay) {
 71 |       let now = context.currentTime
 72 |       let gainNode = this.gainFilter.gain
 73 |       gainNode.setValueAtTime(gainNode.value, now)
 74 |       gainNode.linearRampToValueAtTime(value, now + delay)
 75 |     }
 76 |   }
 77 | 
 78 |   function createWaudio (inst, play) {
 79 |     let waud
 80 |     if (inst instanceof MediaStream) {
 81 |       let wrapper = new MediaStreamWrapper(inst)
 82 |       waud = new Waudio()
 83 |       wrapper.gainFilter.connect(waud.gainFilter)
 84 |     }
 85 |     if (inst instanceof Blob || inst instanceof File) {
 86 |       waud = new Waudio()
 87 |       waud.el.src = URL.createObjectURL(inst)
 88 |     }
 89 |     if (typeof inst === 'boolean') {
 90 |       play = inst
 91 |       inst = null
 92 |     }
 93 |     if (!inst) {
 94 |       waud = new Waudio()
 95 |     } else {
 96 |       // TODO: type error.
 97 |     }
 98 |     if (play) waud.gainFilter.connect(context.destination)
 99 |     return waud
100 |   }
101 | 
102 |   let exports = createWaudio
103 |   exports.context = context
104 |   exports.Waudio = Waudio
105 | 
106 |   return exports
107 | }
108 | 


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/package.json:
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 1 | {
 2 |   "name": "waudio",
 3 |   "version": "2.7.1",
 4 |   "description": "Web Audio made sane.",
 5 |   "main": "index.js",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1"
 8 |   },
 9 |   "keywords": [],
10 |   "author": "Mikeal Rogers <mikeal.rogers@gmail.com> (http://www.mikealrogers.com)",
11 |   "license": "Apache-2.0",
12 |   "dependencies": {
13 |     "media-recorder-stream": "^2.1.0"
14 |   }
15 | }
16 | 


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