javascript - Temasys howto alter existing code -

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i have piece of code in place passes constraints getusermedia.

function captureusermedia(callback) { $('#videosource').css('display', 'none'); var videosource = videoselect.value; var constraints = null;  constraints = {     video: {          optional: [{             sourceid: videosource         }]     },     audio: false }   var htmlelement = document.getelementbyid('rtcvideo'); htmlelement.setattribute('autoplay', true); htmlelement.setattribute('controls', true);  var mediaconfig = {     video: htmlelement,     onsuccess: function(stream) {         config.attachstream = stream;         callback && callback();         htmlelement.setattribute('muted', true);         rotateincircle(htmlelement);     },       onerror: function() {         alert('unable access webcam');     } }; if (constraints) mediaconfig.constraints = constraints; getusermedia(mediaconfig); streamattached = true; }

i.ve tried numerous things working , difficulty perhaps lies in callback found hard head around. how can alter piece of code it'll work? i've tried precede getusermedia navigator needs 3 parameters 2 succes , error callbacks. can see onerror , onsucces calbacks in mediaconfig var. can please take @ it?

update

i saw getusermedia function defined in attached rtcpeerconnection-v1.5.js file:

function getusermedia(options) { var n = navigator,     media; n.getmedia = n.webkitgetusermedia || n.mozgetusermedia; n.getmedia(options.constraints || {         audio: true,         video: video_constraints     }, streaming, options.onerror || function(e) {         console.error(e);     });  function streaming(stream) {     var video = options.video;     if (video) {         video[moz ? 'mozsrcobject' : 'src'] = moz ? stream : window.url.createobjecturl(stream);         video.play();     }     options.onsuccess && options.onsuccess(stream);     media = stream; }  return media; }

i'm assuming have more code around that. (videoselect.value won't work videoselect undefined)

if check the spec, constraints , callbacks 3 separate arguments. should like: 

getusermedia(mediaconfig.constraints, mediaconfig.onsuccess, mediaconfig.onerror);

i hope helps.


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