New Case Study:See how Anthropic automated 95% of dependency reviews with Socket.Learn More →
eme-encryption-scheme-polyfill
Advanced tools
eme-encryption-scheme-polyfill - npm Package Compare versions
Comparing version 1.0.3 to 2.0.0
@@ -0,1 +1,8 @@ | ||
| ## 2.0.0 (2019-12-12) | ||
| Features: | ||
| - Added support for polyfilling MediaCapabilities, too | ||
| - https://github.com/w3c/media-capabilities/issues/100 | ||
| ## 1.0.3 (2019-12-05) | ||
@@ -2,0 +9,0 @@ |
@@ -8,2 +8,2 @@ /*! | ||
| !function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).EmeEncryptionSchemePolyfill=e()}}(function(){var e={exports:{}};function i(e,i,t){return t?i?i(e):e:(e&&e.then||(e=Promise.resolve(e)),i?e.then(i):e)}var t=function(){function e(){}return e.install=function(){e.originalRMKSA_||navigator.requestMediaKeySystemAccess&&MediaKeySystemAccess.prototype.getConfiguration&&(e.originalRMKSA_=navigator.requestMediaKeySystemAccess,navigator.requestMediaKeySystemAccess=e.probeRMKSA_)},e.guessSupportedScheme_=function(e){return e.startsWith("com.widevine")?"cenc":e.startsWith("com.microsoft")?"cenc":e.startsWith("com.adobe")?"cenc":e.startsWith("org.w3")?"cenc":e.startsWith("com.apple")?"cbcs-1-9":(console.warn("EmeEncryptionSchemePolyfill: Unknown key system:",e,"Please contribute!"),null)},e.probeRMKSA_=function(t,r){try{var n=this;return i(e.originalRMKSA_.call(n,t,r),function(i){var a=i.getConfiguration(),o=a.videoCapabilities&&a.videoCapabilities[0],s=a.audioCapabilities&&a.audioCapabilities[0];return void 0!==(o||s).encryptionScheme?(navigator.requestMediaKeySystemAccess=e.originalRMKSA_,i):(navigator.requestMediaKeySystemAccess=e.polyfillRMKSA_,e.polyfillRMKSA_.call(n,t,r))})}catch(a){return Promise.reject(a)}},e.polyfillRMKSA_=function(t,n){try{var a=e.guessSupportedScheme_(t),o=[],s=n,l=Array.isArray(s),c=0;for(s=l?s:s[Symbol.iterator]();;){var u;if(l){if(c>=s.length)break;u=s[c++]}else{if((c=s.next()).done)break;u=c.value}var f=u,p=e.filterCapabilities_(f.videoCapabilities,a),y=e.filterCapabilities_(f.audioCapabilities,a);if(f.videoCapabilities&&f.videoCapabilities.length&&!p.length);else if(f.audioCapabilities&&f.audioCapabilities.length&&!y.length);else{var d=Object.assign({},f);d.videoCapabilities=p,d.audioCapabilities=y,o.push(d)}}if(!o.length){var m=new Error("Unsupported keySystem or supportedConfigurations.");throw m.name="NotSupportedError",m.code=DOMException.NOT_SUPPORTED_ERR,m}return i(e.originalRMKSA_.call(this,t,o),function(e){return new r(e,a)})}catch(h){return Promise.reject(h)}},e.filterCapabilities_=function(e,i){return e?e.filter(function(e){return!e.encryptionScheme||e.encryptionScheme==i}):e},e}(),r=function(){function e(e,i){this.mksa_=e,this.scheme_=i,this.keySystem=e.keySystem}var i=e.prototype;return i.getConfiguration=function(){var e=this.mksa_.getConfiguration();if(e.videoCapabilities){var i=e.videoCapabilities,t=Array.isArray(i),r=0;for(i=t?i:i[Symbol.iterator]();;){var n;if(t){if(r>=i.length)break;n=i[r++]}else{if((r=i.next()).done)break;n=r.value}n.encryptionScheme=this.scheme_}}if(e.audioCapabilities){var a=e.audioCapabilities,o=Array.isArray(a),s=0;for(a=o?a:a[Symbol.iterator]();;){var l;if(o){if(s>=a.length)break;l=a[s++]}else{if((s=a.next()).done)break;l=s.value}l.encryptionScheme=this.scheme_}}return e},i.createMediaKeys=function(){return this.mksa_.createMediaKeys()},e}();return t.originalRMKSA_,e.exports&&(e.exports=t),e=e.exports}); | ||
| !function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).EncryptionSchemePolyfills=e()}}(function(){var e={exports:{}};function i(e,i,t){return t?i?i(e):e:(e&&e.then||(e=Promise.resolve(e)),i?e.then(i):e)}var t=function(){function e(){}return e.install=function(){e.originalRMKSA_||navigator.requestMediaKeySystemAccess&&MediaKeySystemAccess.prototype.getConfiguration&&(e.originalRMKSA_=navigator.requestMediaKeySystemAccess,navigator.requestMediaKeySystemAccess=e.probeRMKSA_)},e.probeRMKSA_=function(t,n){try{var o=this;return i(e.originalRMKSA_.call(o,t,n),function(i){return a(i)?(navigator.requestMediaKeySystemAccess=e.originalRMKSA_,i):(navigator.requestMediaKeySystemAccess=e.polyfillRMKSA_,e.polyfillRMKSA_.call(o,t,n))})}catch(r){return Promise.reject(r)}},e.polyfillRMKSA_=function(t,n){try{var a=r(t),s=[],c=n,l=Array.isArray(c),f=0;for(c=l?c:c[Symbol.iterator]();;){var u;if(l){if(f>=c.length)break;u=c[f++]}else{if((f=c.next()).done)break;u=f.value}var d=u,y=e.filterCapabilities_(d.videoCapabilities,a),p=e.filterCapabilities_(d.audioCapabilities,a);if(d.videoCapabilities&&d.videoCapabilities.length&&!y.length);else if(d.audioCapabilities&&d.audioCapabilities.length&&!p.length);else{var g=Object.assign({},d);g.videoCapabilities=y,g.audioCapabilities=p,s.push(g)}}if(!s.length){var m=new Error("Unsupported keySystem or supportedConfigurations.");throw m.name="NotSupportedError",m.code=DOMException.NOT_SUPPORTED_ERR,m}return i(e.originalRMKSA_.call(this,t,s),function(e){return new o(e,a)})}catch(h){return Promise.reject(h)}},e.filterCapabilities_=function(e,i){return e?e.filter(function(e){return!e.encryptionScheme||e.encryptionScheme==i}):e},e}(),n=function(){function e(){}return e.install=function(){navigator.mediaCapabilities&&(e.originalDecodingInfo_=navigator.mediaCapabilities.decodingInfo,navigator.mediaCapabilities.decodingInfo=e.probeDecodingInfo_)},e.probeDecodingInfo_=function(t){try{var n=this;return i(e.originalDecodingInfo_.call(n,t),function(i){return t.keySystemConfiguration?a(i.keySystemAccess)?(navigator.mediaCapabilities.decodingInfo=e.originalDecodingInfo_,i):(navigator.mediaCapabilities.decodingInfo=e.polyfillDecodingInfo_,e.polyfillDecodingInfo_.call(n,t)):i})}catch(o){return Promise.reject(o)}},e.polyfillDecodingInfo_=function(t){try{var n=null;if(t.keySystemConfiguration){var a=t.keySystemConfiguration,s=a.keySystem,c=a.audio&&a.audio.encryptionScheme,l=a.video&&a.video.encryptionScheme;n=r(s);var f={powerEfficient:!1,smooth:!1,supported:!1,keySystemAccess:null,configuration:t};if(c&&c!=n)return f;if(l&&l!=n)return f}return i(e.originalDecodingInfo_.call(this,t),function(e){return e.keySystemAccess&&(e.keySystemAccess=new o(e.keySystemAccess,n)),e})}catch(u){return Promise.reject(u)}},e}(),o=function(){function e(e,i){this.mksa_=e,this.scheme_=i,this.keySystem=e.keySystem}var i=e.prototype;return i.getConfiguration=function(){var e=this.mksa_.getConfiguration();if(e.videoCapabilities){var i=e.videoCapabilities,t=Array.isArray(i),n=0;for(i=t?i:i[Symbol.iterator]();;){var o;if(t){if(n>=i.length)break;o=i[n++]}else{if((n=i.next()).done)break;o=n.value}o.encryptionScheme=this.scheme_}}if(e.audioCapabilities){var r=e.audioCapabilities,a=Array.isArray(r),s=0;for(r=a?r:r[Symbol.iterator]();;){var c;if(a){if(s>=r.length)break;c=r[s++]}else{if((s=r.next()).done)break;c=s.value}c.encryptionScheme=this.scheme_}}return e},i.createMediaKeys=function(){return this.mksa_.createMediaKeys()},e}();function r(e){return e.startsWith("com.widevine")?"cenc":e.startsWith("com.microsoft")?"cenc":e.startsWith("com.adobe")?"cenc":e.startsWith("org.w3")?"cenc":e.startsWith("com.apple")?"cbcs-1-9":(console.warn("EmeEncryptionSchemePolyfill: Unknown key system:",e,"Please contribute!"),null)}function a(e){var i=e.getConfiguration(),t=i.videoCapabilities&&i.videoCapabilities[0],n=i.audioCapabilities&&i.audioCapabilities[0];return void 0!==(t||n).encryptionScheme}t.originalRMKSA_,n.originalDecodingInfo_;var s=function(){function e(){}return e.install=function(){t.install(),n.install()},e}();return e.exports&&(e.exports=s),e=e.exports}); |
306
index.js
@@ -59,34 +59,2 @@ /*! | ||
| /** | ||
| * Guess the supported encryption scheme for the key system. | ||
| * | ||
| * @param {string} keySystem The key system ID. | ||
| * @return {?string} A guess at the encryption scheme this key system | ||
| * supports. | ||
| * @private | ||
| */ | ||
| static guessSupportedScheme_(keySystem) { | ||
| if (keySystem.startsWith('com.widevine')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('com.microsoft')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('com.adobe')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('org.w3')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('com.apple')) { | ||
| return 'cbcs-1-9'; | ||
| } | ||
| // We don't have this key system in our map! | ||
| // Log a warning. The only way the request will succeed now is if the | ||
| // app doesn't specify an encryption scheme in their own configs. | ||
| // Use bracket notation to keep this from being stripped from the build. | ||
| console['warn']('EmeEncryptionSchemePolyfill: Unknown key system:', | ||
| keySystem, 'Please contribute!'); | ||
| return null; | ||
| } | ||
| /** | ||
| * A shim for navigator.requestMediaKeySystemAccess to check for | ||
@@ -114,16 +82,3 @@ * encryptionScheme support. Only used until we know if the browser has | ||
| const configuration = mediaKeySystemAccess.getConfiguration(); | ||
| // It doesn't matter which capability we look at. For this check, they | ||
| // should all produce the same result. | ||
| const firstVideoCapability = | ||
| configuration.videoCapabilities && configuration.videoCapabilities[0]; | ||
| const firstAudioCapability = | ||
| configuration.audioCapabilities && configuration.audioCapabilities[0]; | ||
| const firstCapability = firstVideoCapability || firstAudioCapability; | ||
| // If supported by the browser, the encryptionScheme field must appear in | ||
| // the returned configuration, regardless of whether or not it was | ||
| // specified in the supportedConfigurations given by the application. | ||
| if (firstCapability['encryptionScheme'] !== undefined) { | ||
| if (hasEncryptionScheme(mediaKeySystemAccess)) { | ||
| // The browser supports the encryptionScheme field! | ||
@@ -175,4 +130,3 @@ // No need for a patch. Revert back to the original implementation. | ||
| const supportedScheme = EmeEncryptionSchemePolyfill.guessSupportedScheme_( | ||
| keySystem); | ||
| const supportedScheme = guessSupportedScheme(keySystem); | ||
@@ -263,2 +217,171 @@ // Filter the application's configurations based on our guess of what | ||
| /** | ||
| * A polyfill to add support for EncryptionScheme queries in MediaCapabilities. | ||
| * | ||
| * Because this polyfill can't know what schemes the UA or CDM actually support, | ||
| * it assumes support for the historically-supported schemes of each well-known | ||
| * key system. | ||
| * | ||
| * In source form, this is compatible with the Closure Compiler, CommonJS, and | ||
| * AMD module formats. It can also be directly included via a script tag. | ||
| * | ||
| * The minified bundle is a standalone module compatible with the CommonJS and | ||
| * AMD module formats, and can also be directly included via a script tag. | ||
| * | ||
| * @see https://wicg.github.io/encrypted-media-encryption-scheme/ | ||
| * @see https://github.com/w3c/encrypted-media/pull/457 | ||
| * @export | ||
| */ | ||
| class McEncryptionSchemePolyfill { | ||
| /** | ||
| * Installs the polyfill. To avoid the possibility of extra user prompts, | ||
| * this will shim MC so long as it exists, without checking support for | ||
| * encryptionScheme upfront. The support check will happen on-demand the | ||
| * first time MC is used. | ||
| * | ||
| * @export | ||
| */ | ||
| static install() { | ||
| if (!navigator.mediaCapabilities) { | ||
| console.debug('McEncryptionSchemePolyfill: MediaCapabilities not found'); | ||
| // No MediaCapabilities. | ||
| return; | ||
| } | ||
| // Save the original. | ||
| McEncryptionSchemePolyfill.originalDecodingInfo_ = | ||
| navigator.mediaCapabilities.decodingInfo; | ||
| // Patch in a method which will check for support on the first call. | ||
| console.debug('McEncryptionSchemePolyfill: ' + | ||
| 'Waiting to detect encryptionScheme support.'); | ||
| navigator.mediaCapabilities.decodingInfo = | ||
| McEncryptionSchemePolyfill.probeDecodingInfo_; | ||
| } | ||
| /** | ||
| * A shim for mediaCapabilities.decodingInfo to check for encryptionScheme | ||
| * support. Only used until we know if the browser has native support for the | ||
| * encryptionScheme field. | ||
| * | ||
| * @this {MediaCapabilities} | ||
| * @param {!MediaDecodingConfiguration} requestedConfiguration The requested | ||
| * decoding configuration. | ||
| * @return {!Promise.<!MediaCapabilitiesDecodingInfo>} A Promise to a result | ||
| * describing the capabilities of the browser in the request configuration. | ||
| * @private | ||
| */ | ||
| static async probeDecodingInfo_(requestedConfiguration) { | ||
| console.assert(this == navigator.mediaCapabilities, | ||
| 'bad "this" for decodingInfo'); | ||
| // Call the original version. If the call succeeds, we look at the result | ||
| // to decide if the encryptionScheme field is supported or not. | ||
| const capabilities = | ||
| await McEncryptionSchemePolyfill.originalDecodingInfo_.call( | ||
| this, requestedConfiguration); | ||
| if (!requestedConfiguration.keySystemConfiguration) { | ||
| // This was not a query regarding encrypted content. The results are | ||
| // valid, but won't tell us anything about native support for | ||
| // encryptionScheme. Just return the results. | ||
| return capabilities; | ||
| } | ||
| const mediaKeySystemAccess = capabilities.keySystemAccess; | ||
| if (hasEncryptionScheme(mediaKeySystemAccess)) { | ||
| // The browser supports the encryptionScheme field! | ||
| // No need for a patch. Revert back to the original implementation. | ||
| console.debug('McEncryptionSchemePolyfill: ' + | ||
| 'Native encryptionScheme support found.'); | ||
| // eslint-disable-next-line require-atomic-updates | ||
| navigator.mediaCapabilities.decodingInfo = | ||
| McEncryptionSchemePolyfill.originalDecodingInfo_; | ||
| // Return the results, which are completely valid. | ||
| return capabilities; | ||
| } | ||
| // If we land here, the browser does _not_ support the encryptionScheme | ||
| // field. So we install another patch to check the encryptionScheme field | ||
| // in future calls. | ||
| console.debug('McEncryptionSchemePolyfill: ' + | ||
| 'No native encryptionScheme support found. '+ | ||
| 'Patching encryptionScheme support.'); | ||
| // eslint-disable-next-line require-atomic-updates | ||
| navigator.mediaCapabilities.decodingInfo = | ||
| McEncryptionSchemePolyfill.polyfillDecodingInfo_; | ||
| // The results we have may not be valid. Run the query again through our | ||
| // polyfill. | ||
| return McEncryptionSchemePolyfill.polyfillDecodingInfo_.call( | ||
| this, requestedConfiguration); | ||
| } | ||
| /** | ||
| * A polyfill for mediaCapabilities.decodingInfo to handle the | ||
| * encryptionScheme field in browsers that don't support it. It uses the | ||
| * user-agent string to guess what encryption schemes are supported, then | ||
| * those guesses are used to reject unsupported schemes. | ||
| * | ||
| * @this {MediaCapabilities} | ||
| * @param {!MediaDecodingConfiguration} requestedConfiguration The requested | ||
| * decoding configuration. | ||
| * @return {!Promise.<!MediaCapabilitiesDecodingInfo>} A Promise to a result | ||
| * describing the capabilities of the browser in the request configuration. | ||
| * @private | ||
| */ | ||
| static async polyfillDecodingInfo_(requestedConfiguration) { | ||
| console.assert(this == navigator.mediaCapabilities, | ||
| 'bad "this" for decodingInfo'); | ||
| let supportedScheme = null; | ||
| if (requestedConfiguration.keySystemConfiguration) { | ||
| const keySystemConfig = requestedConfiguration.keySystemConfiguration; | ||
| const keySystem = keySystemConfig.keySystem; | ||
| const audioScheme = keySystemConfig.audio && | ||
| keySystemConfig.audio.encryptionScheme; | ||
| const videoScheme = keySystemConfig.video && | ||
| keySystemConfig.video.encryptionScheme; | ||
| supportedScheme = guessSupportedScheme(keySystem); | ||
| const notSupportedResult = { | ||
| powerEfficient: false, | ||
| smooth: false, | ||
| supported: false, | ||
| keySystemAccess: null, | ||
| configuration: requestedConfiguration, | ||
| }; | ||
| if (audioScheme && audioScheme != supportedScheme) { | ||
| return notSupportedResult; | ||
| } | ||
| if (videoScheme && videoScheme != supportedScheme) { | ||
| return notSupportedResult; | ||
| } | ||
| } | ||
| // At this point, either it's unencrypted or we assume the encryption scheme | ||
| // is supported. So delegate to the original decodingInfo() method. | ||
| const capabilities = | ||
| await McEncryptionSchemePolyfill.originalDecodingInfo_.call( | ||
| this, requestedConfiguration); | ||
| if (capabilities.keySystemAccess) { | ||
| // If the result is supported and encrypted, this will be a | ||
| // MediaKeySystemAccess instance. Wrap the MKSA object in ours to provide | ||
| // the missing field in the returned configuration. | ||
| capabilities.keySystemAccess = | ||
| new EmeEncryptionSchemePolyfillMediaKeySystemAccess( | ||
| capabilities.keySystemAccess, supportedScheme); | ||
| } | ||
| return capabilities; | ||
| } | ||
| } | ||
| /** | ||
| * A wrapper around MediaKeySystemAccess that adds encryptionScheme | ||
@@ -323,2 +446,58 @@ * fields to the configuration, to emulate what a browser with native support | ||
| /** | ||
| * Guess the supported encryption scheme for the key system. | ||
| * | ||
| * @param {string} keySystem The key system ID. | ||
| * @return {?string} A guess at the encryption scheme this key system | ||
| * supports. | ||
| */ | ||
| function guessSupportedScheme(keySystem) { | ||
| if (keySystem.startsWith('com.widevine')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('com.microsoft')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('com.adobe')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('org.w3')) { | ||
| return 'cenc'; | ||
| } else if (keySystem.startsWith('com.apple')) { | ||
| return 'cbcs-1-9'; | ||
| } | ||
| // We don't have this key system in our map! | ||
| // Log a warning. The only way the request will succeed now is if the | ||
| // app doesn't specify an encryption scheme in their own configs. | ||
| // Use bracket notation to keep this from being stripped from the build. | ||
| console['warn']('EmeEncryptionSchemePolyfill: Unknown key system:', | ||
| keySystem, 'Please contribute!'); | ||
| return null; | ||
| } | ||
| /** | ||
| * @param {?MediaKeySystemAccess} mediaKeySystemAccess A native | ||
| * MediaKeySystemAccess instance from the browser. | ||
| * @return {boolean} True if browser natively supports encryptionScheme. | ||
| */ | ||
| function hasEncryptionScheme(mediaKeySystemAccess) { | ||
| const configuration = mediaKeySystemAccess.getConfiguration(); | ||
| // It doesn't matter which capability we look at. For this check, they | ||
| // should all produce the same result. | ||
| const firstVideoCapability = | ||
| configuration.videoCapabilities && configuration.videoCapabilities[0]; | ||
| const firstAudioCapability = | ||
| configuration.audioCapabilities && configuration.audioCapabilities[0]; | ||
| const firstCapability = firstVideoCapability || firstAudioCapability; | ||
| // If supported by the browser, the encryptionScheme field must appear in | ||
| // the returned configuration, regardless of whether or not it was | ||
| // specified in the supportedConfigurations given by the application. | ||
| if (firstCapability['encryptionScheme'] !== undefined) { | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
| /** | ||
| * The original requestMediaKeySystemAccess, before we patched it. | ||
@@ -336,2 +515,31 @@ * | ||
| /** | ||
| * The original decodingInfo, before we patched it. | ||
| * | ||
| * @type { | ||
| * function(this:MediaCapabilities, | ||
| * !MediaDecodingConfiguration | ||
| * ):!Promise.<!MediaCapabilitiesDecodingInfo> | ||
| * } | ||
| * @private | ||
| */ | ||
| McEncryptionSchemePolyfill.originalDecodingInfo_; | ||
| /** | ||
| * A single entry point for both polyfills (EME & MC). | ||
| * | ||
| * @export | ||
| */ | ||
| class EncryptionSchemePolyfills { | ||
| /** | ||
| * Installs both polyfills (EME & MC). | ||
| * | ||
| * @export | ||
| */ | ||
| static install() { | ||
| EmeEncryptionSchemePolyfill.install(); | ||
| McEncryptionSchemePolyfill.install(); | ||
| } | ||
| } | ||
| // Support for CommonJS and AMD module formats. | ||
@@ -341,4 +549,4 @@ /** @suppress {undefinedVars} */ | ||
| if (typeof module !== 'undefined' && module.exports) { | ||
| module.exports = EmeEncryptionSchemePolyfill; | ||
| module.exports = EncryptionSchemePolyfills; | ||
| } | ||
| })(); |
| { | ||
| "name": "eme-encryption-scheme-polyfill", | ||
| "description": "A polyfill for the encryptionScheme field in EME", | ||
| "version": "1.0.3", | ||
| "version": "2.0.0", | ||
| "license": "Apache-2.0", | ||
@@ -20,3 +20,3 @@ "author": "Google", | ||
| "closure-compiler-check": "google-closure-compiler -O ADVANCED --generate_exports --js_output_file /dev/null --jscomp_error '*' closure-compiler-check/* index.js", | ||
| "build": "browserify index.js -s EmeEncryptionSchemePolyfill -t babelify -t stripify -p tinyify -p browserify-header -o dist/eme-encryption-scheme-polyfill.js", | ||
| "build": "browserify index.js -s EncryptionSchemePolyfills -t babelify -t stripify -p tinyify -p browserify-header -o dist/eme-encryption-scheme-polyfill.js", | ||
| "prepublishOnly": "npm run-script lint && npm run-script closure-compiler-check && npm run-script build" | ||
@@ -23,0 +23,0 @@ }, |
@@ -1,4 +0,5 @@ | ||
| # EME Encryption Scheme Polyfill | ||
| # EME & MediaCapabilities Encryption Scheme Polyfill | ||
| A polyfill to add support for EncryptionScheme queries in EME. | ||
| A polyfill to add support for EncryptionScheme queries in EME and | ||
| MediaCapabilities. | ||
@@ -8,2 +9,3 @@ - https://wicg.github.io/encrypted-media-encryption-scheme/ | ||
| - https://github.com/WICG/encrypted-media-encryption-scheme/issues/13 | ||
| - https://github.com/w3c/media-capabilities/issues/100 | ||
@@ -19,8 +21,8 @@ Because this polyfill can't know what schemes the UA or CDM actually support, | ||
| module compatible with the CommonJS and AMD module formats, and can also be | ||
| directly included via a script tag. It is about 3.1kB uncompressed, and gzips | ||
| to about 1.2kB. | ||
| directly included via a script tag. It is about 4.4kB uncompressed, and gzips | ||
| to about 1.5kB. | ||
| To avoid the possibility of extra user prompts, this will shim EME so long as | ||
| it exists, without checking support for `encryptionScheme` upfront. The | ||
| support check will happen on-demand the first time EME is used. | ||
| To avoid the possibility of extra user prompts, this will shim EME & MC so long | ||
| as they exist, without checking support for `encryptionScheme` upfront. The | ||
| support check will happen on-demand the first time EME/MC are used. | ||
@@ -39,3 +41,8 @@ | ||
| ```js | ||
| // Install both EME & MC polyfills at once: | ||
| EncryptionSchemePolyfills.install(); | ||
| // Install each one separately (unminified source only): | ||
| EmeEncryptionSchemePolyfill.install(); | ||
| McEncryptionSchemePolyfill.install(); | ||
| ``` |
No alert changes
Improved metrics
- Total package byte prevSize
- increased by29.12%
39870
- Lines of code
- increased by59.35%
494
- Number of lines in readme file
- increased by17.95%
46
No dependency changes