// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Miscellaneous utility functions for HTML media tests. Loading this script
// should not modify the page in any way.
//
var QueryString = function () {
// Allows access to query parameters on the URL; e.g., given a URL like:
//
// http://<url>/my.html?test=123&bob=123
//
// parameters can now be accessed via QueryString.test or QueryString.bob.
var params = {};
// RegEx to split out values by &.
var r = /([^&=]+)=?([^&]*)/g;
// Lambda function for decoding extracted match values. Replaces '+' with
// space so decodeURIComponent functions properly.
function d(s) { return decodeURIComponent(s.replace(/\+/g, ' ')); }
var match;
while (match = r.exec(window.location.search.substring(1)))
params[d(match[1])] = d(match[2]);
return params;
} ();
function getCurrentTime() {
if (window.performance.now)
return window.performance.now();
else
return new Date().getTime();
}
function Timer() {
this.start_ = 0;
this.times_ = [];
}
Timer.prototype = {
start: function() {
this.start_ = getCurrentTime();
},
stop: function() {
var delta = getCurrentTime() - this.start_;
this.times_.push(delta);
return delta;
},
reset: function() {
this.start_ = 0;
this.times_ = [];
}
}
function GenerateUniqueURL(src) {
var ch = src.indexOf('?') >= 0 ? '&' : '?';
return src + ch + 't=' + (new Date()).getTime();
}