カメラから映像とるやつ

webcam.coffee

class window.WebCam
  constructor: ->
    @video = document.createElement('video')

  init: (playCallback, failCallback) ->
    userMedia = navigator.getUserMedia or navigator.webkitGetUserMedia
    if not userMedia
      return failCallback?()

    @video.addEventListener('canplay', => @video.play())
    @video.addEventListener('timeupdate', =>
      @width = @video.videoWidth
      @height = @video.videoHeight
      if @width or @height
        @video.removeEventListener('timeupdate', arguments.callee, false)
        playCallback?()
    , false)
    setSourceURL = (src) =>
      url = window.URL or window.webkitURL
      @video.src = if url then url.createObjectURL(src) else src

    userMedia.call(navigator,
      { video: true, toString: -> 'video' }, setSourceURL, failCallback)