确定浏览器支持的DRM系统 [英] Determine DRM system supported by browser
问题描述
我试图找出如何确定哪个DRM系统浏览器正在使用。事实上,只有铬说它是使用'com.widevine.alpha',其中IE& 'requestMediaKeySystemAccess'上的Safari(Win)抛出错误,并且firefox甚至没有尝试使用'com.adobe.acccess'=]
I've trying to find out how to determine which DRM system browser is using. And in fact, only chrome say it is use 'com.widevine.alpha' where IE & Safari (Win) throw error on 'requestMediaKeySystemAccess', and firefox do not even try to say it use 'com.adobe.acccess' =]
function isKeySystemSupported(keySystem) {
var dfd = Q.defer();
console.log('check: ', keySystem);
navigator.requestMediaKeySystemAccess(keySystem, [{contentType: 'video/webm; codecs="vp9"'}]).then(function() {
dfd.resolve(true);
}, function() { dfd.resolve(false); } );
return dfd.promise;
}
是否有任何解决方案,如Modernizr或类似的解决方案,以获取我应该使用的keySystem ?
is there any solution, like Modernizr or similar to get which keySystem I should use?
推荐答案
有几个网站提供此类支票,例如 dash-player.com/browser-capabilities/ 仔细研究完成后,可以使用类似的东西:
There are several websites offering such a check, like dash-player.com/browser-capabilities/ After having a closer look at how it is done, one can use something similar to:
// EME Check
var keySystems = {
widevine: ['com.widevine.alpha'],
playready: ['com.microsoft.playready', 'com.youtube.playready'],
clearkey: ['webkit-org.w3.clearkey', 'org.w3.clearkey'],
primetime: ['com.adobe.primetime', 'com.adobe.access'],
fairplay: ['com.apple.fairplay']
};
var keySystemsCount = (function () {
var count = 0;
for (keysys in keySystems) {
if (keySystems.hasOwnProperty(keysys)) {
count += keySystems[keysys].length;
}
}
return count;
})();
var testVideoElement = document.createElement('video');
var supportedSystems = [];
var unsupportedSystems = [];
var supportsEncryptedMediaExtension = function () {
if (!testVideoElement.mediaKeys) {
if (window.navigator.requestMediaKeySystemAccess) {
if (typeof window.navigator.requestMediaKeySystemAccess === 'function') {
console.log('found default EME');
hasEME = true;
var isKeySystemSupported = function (keySystem) {
var config = [{initDataTypes: ['cenc']}];
if (window.navigator.requestMediaKeySystemAccess) {
window.navigator.requestMediaKeySystemAccess(keySystem, config).then(function (keySystemAccess) {
supportedSystems.push(keySystem);
}).catch(function () {
unsupportedSystems.push(keySystem);
});
}
};
var keysys, dummy, i;
for (keysys in keySystems) {
if (keySystems.hasOwnProperty(keysys)) {
for (dummy in keySystems[keysys]) {
isKeySystemSupported(keySystems[keysys][dummy]);
}
}
}
}
} else if (window.MSMediaKeys) {
if (typeof window.MSMediaKeys === 'function') {
console.log('found MS-EME');
hasEME = true;
var keysys, dummy, i;
for (keysys in keySystems) {
if (keySystems.hasOwnProperty(keysys)) {
for (dummy in keySystems[keysys]) {
if (MSMediaKeys.isTypeSupported(keySystems[keysys][dummy])) {
supportedSystems.push(keySystems[keysys][dummy]);
} else {
unsupportedSystems.push(keySystems[keysys][dummy]);
}
}
}
}
}
} else if (testVideoElement.webkitGenerateKeyRequest) {
if (typeof testVideoElement.webkitGenerateKeyRequest === 'function') {
console.log('found WebKit EME');
hasEME = true;
var keysys, dummy, i;
for (keysys in keySystems) {
if (keySystems.hasOwnProperty(keysys)) {
for (dummy in keySystems[keysys]) {
if (testVideoElement.canPlayType('video/mp4', keySystems[keysys][dummy])) {
supportedSystems.push(keySystems[keysys][dummy]);
} else {
unsupportedSystems.push(keySystems[keysys][dummy]);
}
}
}
}
}
} else {
console.log('no supported EME implementation found');
hasEME = false;
}
}
}
只需运行 supportsEncryptedMediaExtension()和 supportedSystems 将填充所需的信息。
Simply run supportsEncryptedMediaExtension() and supportedSystems will be filled with the desired information.
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