Determine DRM system supported by browser
Solution 1
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;
}
}
}
Simply run supportsEncryptedMediaExtension() and supportedSystems will be filled with the desired information.
Note that the config
object should be extended to include the specific codec claims respective to your particular media. It isn't enough to just detect the key system as codec support sometimes depends on Guest OS dependencies.
var config = [{
"initDataTypes": ["cenc"],
"audioCapabilities": [{
"contentType": "audio/mp4;codecs=\"mp4a.40.2\""
}],
"videoCapabilities": [{
"contentType": "video/mp4;codecs=\"avc1.42E01E\""
}]
}];
Solution 2
In addition to the information listed here, I want to mention that in Chrome, whether you are using https
or not will affect the availability of navigator.requestMediaKeySystemAccess
function.
In your development environment that probably is running on http
, navigator.requestMediaKeySystemAccess
will return undefined
for Chrome whereas the same code will return a function in Firefox.
In your prod environment that has https
, navigator.requestMediaKeySystemAccess
will return a function both in Chrome and Firefox.
nilphilus
Updated on June 04, 2022Comments
-
nilphilus almost 2 years
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; }
is there any solution, like Modernizr or similar to get which keySystem I should use?
-
Boushley over 7 yearsThis is great! Where did you find the list of key system strings? I know
org.w3.clearkey
comes from the w3 spec - w3c.github.io/encrypted-media/#common-key-systems -. But I have trouble tracking down where the others come from. -
Thiago Miranda de Oliveira almost 7 yearsSafari seems to return undefined on the
webkitGenerateKeyRequest
property. Does anyone are experimenting this problem? Thanks -
Haris ur Rehman about 5 yearsOn Firefox, its working with http, but giving warning that soon it will be deprecated and use of https will be mandatory.