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|
//
// -- ogv-support.js
// https://github.com/brion/ogv.js
// Copyright (c) 2013-2015 Brion Vibber
//
(function() {
/**
* A quick CPU/JS engine benchmark to guesstimate whether we're
* fast enough to handle 360p video in JavaScript.
*/
function BogoSlow() {
var self = this;
var timer;
if (window.performance && window.performance.now) {
timer = function() {
return window.performance.now();
};
} else {
timer = function() {
return Date.now();
};
}
var savedSpeed = null;
function run() {
var ops = 0;
var fibonacci = function(n) {
ops++;
if (n < 2) {
return n;
} else {
return fibonacci(n - 2) + fibonacci(n - 1);
}
};
var start = timer();
fibonacci(30);
var delta = timer() - start;
savedSpeed = (ops / delta);
}
/**
* Return a scale value of operations/sec from the benchmark.
* If the benchmark has already been run, uses a memoized result.
*
* @property {number}
*/
Object.defineProperty(self, 'speed', {
get: function() {
if (savedSpeed === null) {
run();
}
return savedSpeed;
}
});
/**
* Return the defined cutoff speed value for 'slow' devices,
* based on results measured from some test devices.
*
* @property {number}
*/
Object.defineProperty(self, 'slowCutoff', {
get: function() {
// 2012 Retina MacBook Pro (Safari 7) ~150,000
// 2009 Dell T5500 (IE 11) ~100,000
// iPad Air (iOS 7) ~65,000
// 2010 MBP / OS X 10.9 (Safari 7) ~62,500
// 2010 MBP / Win7 VM (IE 11) ~50,000+-
// ^ these play 360p ok
// ----------- line of moderate doom ----------
return 50000;
// v these play 160p ok
// iPad Mini non-Retina (iOS 8 beta) ~25,000
// Dell Inspiron Duo (IE 11) ~25,000
// Surface RT (IE 11) ~18,000
// iPod Touch 5th-gen (iOS 8 beta) ~16,000
}
});
/**
* Return the defined cutoff speed value for 'too slow' devices,
* based on results measured from some test devices.
*
* @property {number}
*/
Object.defineProperty(self, 'tooSlowCutoff', {
get: function() {
// ------------ line of total doom ------------
return 12000;
// v these are toooooo slow and explode
// Chrome on iPhone 5s (iOS 8) ~8,000
// iPod 4th-gen (iOS 6.1) ~6,750
// iPhone 3Gs (iOS 6.1) ~4,500
}
});
/**
* 'Slow' devices can play audio and should sorta play our
* extra-tiny Wikimedia 160p15 transcodes
*
* @property {boolean}
*/
Object.defineProperty(self, 'slow', {
get: function() {
return (self.speed < self.slowCutoff);
}
});
/**
* 'Too slow' devices aren't reliable at all
*
* @property {boolean}
*/
Object.defineProperty(self, 'tooSlow', {
get: function() {
return (self.speed < self.tooSlowCutoff);
}
});
}
OGVCompat = {
benchmark: new BogoSlow(),
hasTypedArrays: function() {
// emscripten-compiled code requires typed arrays
return !!window.Uint32Array;
},
hasWebAudio: function() {
return !!(window.AudioContext || window.webkitAudioContext);
},
hasFlash: function() {
if (navigator.userAgent.indexOf('Trident') !== -1) {
// We only do the ActiveX test because we only need Flash in
// Internet Explorer 10/11. Other browsers use Web Audio directly
// (Edge, Safari) or native playback, so there's no need to test
// other ways of loading Flash.
try {
var obj = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
return true;
} catch(e) {
return false;
}
}
return false;
},
hasAudio: function() {
return this.hasWebAudio() || this.hasFlash();
},
isBlacklisted: function(userAgent) {
// JIT bugs in old Safari versions
var blacklist = [
/\(i.* OS [67]_.* like Mac OS X\).* Mobile\/.* Safari\//,
/\(Macintosh.* Version\/6\..* Safari\/\d/
];
var blacklisted = false;
blacklist.forEach(function(regex) {
if (userAgent.match(regex)) {
blacklisted = true;
}
});
return blacklisted;
},
isSlow: function() {
return this.benchmark.slow;
},
isTooSlow: function() {
return this.benchmark.tooSlow;
},
supported: function(component) {
if (component === 'OGVDecoder') {
return (this.hasTypedArrays() && !this.isBlacklisted(navigator.userAgent));
}
if (component === 'OGVPlayer') {
return (this.supported('OGVDecoder') && this.hasAudio() && !this.isTooSlow());
}
return false;
}
};
this.OGVCompat = OGVCompat;
})();
this.OGVVersion = "1.0-20150904182230-dd3c8e8";
|
