LJ/www/trckr/js/libs/utils.js
2020-09-19 14:28:56 +02:00

44 lines
1.4 KiB
JavaScript

// helper functions
/**
* Provides requestAnimationFrame in a cross browser way.
*/
window.requestAnimFrame = (function() {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
return window.setTimeout(callback, 1000/60);
};
})();
/**
* Provides cancelRequestAnimationFrame in a cross browser way.
*/
window.cancelRequestAnimFrame = (function() {
return window.cancelAnimationFrame ||
window.webkitCancelRequestAnimationFrame ||
window.mozCancelRequestAnimationFrame ||
window.oCancelRequestAnimationFrame ||
window.msCancelRequestAnimationFrame ||
window.clearTimeout;
})();
// video support utility functions
function supports_video() {
return !!document.createElement('video').canPlayType;
}
function supports_h264_baseline_video() {
if (!supports_video()) { return false; }
var v = document.createElement("video");
return v.canPlayType('video/mp4; codecs="avc1.42E01E, mp4a.40.2"');
}
function supports_webm_video() {
if (!supports_video()) { return false; }
var v = document.createElement("video");
return v.canPlayType('video/webm; codecs="vp8"');
}