Source: lib/util/platform.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  7. goog.provide('shaka.util.Platform');
  9. goog.require('shaka.log');
  10. goog.require('shaka.util.DrmUtils');
  11. goog.require('shaka.util.Timer');
  14. /**
  15.  * A wrapper for platform-specific functions.
  16.  *
  17.  * @final
  18.  */
  19. shaka.util.Platform = class {
  20.   /**
  21.    * Check if the current platform supports media source. We assume that if
  22.    * the current platform supports media source, then we can use media source
  23.    * as per its design.
  24.    *
  25.    * @return {boolean}
  26.    */
  27.   static supportsMediaSource() {
  28.     const mediaSource = window.ManagedMediaSource || window.MediaSource;
  29.     // Browsers that lack a media source implementation will have no reference
  30.     // to |window.MediaSource|. Platforms that we see having problematic media
  31.     // source implementations will have this reference removed via a polyfill.
  32.     if (!mediaSource) {
  33.       return false;
  34.     }
  36.     // Some very old MediaSource implementations didn't have isTypeSupported.
  37.     if (!mediaSource.isTypeSupported) {
  38.       return false;
  39.     }
  41.     return true;
  42.   }
  44.   /**
  45.    * Returns true if the media type is supported natively by the platform.
  46.    *
  47.    * @param {string} mimeType
  48.    * @return {boolean}
  49.    */
  50.   static supportsMediaType(mimeType) {
  51.     const video = shaka.util.Platform.anyMediaElement();
  52.     return video.canPlayType(mimeType) != '';
  53.   }
  55.   /**
  56.    * Check if the current platform is MS Edge.
  57.    *
  58.    * @return {boolean}
  59.    */
  60.   static isEdge() {
  61.     // Legacy Edge contains "Edge/version".
  62.     // Chromium-based Edge contains "Edg/version" (no "e").
  63.     if (navigator.userAgent.match(/Edge?\//)) {
  64.       return true;
  65.     }
  67.     return false;
  68.   }
  70.   /**
  71.    * Check if the current platform is Legacy Edge.
  72.    *
  73.    * @return {boolean}
  74.    */
  75.   static isLegacyEdge() {
  76.     // Legacy Edge contains "Edge/version".
  77.     // Chromium-based Edge contains "Edg/version" (no "e").
  78.     if (navigator.userAgent.match(/Edge\//)) {
  79.       return true;
  80.     }
  82.     return false;
  83.   }
  85.   /**
  86.    * Check if the current platform is MS IE.
  87.    *
  88.    * @return {boolean}
  89.    */
  90.   static isIE() {
  91.     return shaka.util.Platform.userAgentContains_('Trident/');
  92.   }
  94.   /**
  95.    * Check if the current platform is an Xbox One.
  96.    *
  97.    * @return {boolean}
  98.    */
  99.   static isXboxOne() {
  100.     return shaka.util.Platform.userAgentContains_('Xbox One');
  101.   }
  103.   /**
  104.    * Check if the current platform is a Tizen TV.
  105.    *
  106.    * @return {boolean}
  107.    */
  108.   static isTizen() {
  109.     return shaka.util.Platform.userAgentContains_('Tizen');
  110.   }
  112.   /**
  113.    * Check if the current platform is a Tizen 6 TV.
  114.    *
  115.    * @return {boolean}
  116.    */
  117.   static isTizen6() {
  118.     return shaka.util.Platform.userAgentContains_('Tizen 6');
  119.   }
  121.   /**
  122.    * Check if the current platform is a Tizen 5.0 TV.
  123.    *
  124.    * @return {boolean}
  125.    */
  126.   static isTizen5_0() {
  127.     return shaka.util.Platform.userAgentContains_('Tizen 5.0');
  128.   }
  130.   /**
  131.    * Check if the current platform is a Tizen 5 TV.
  132.    *
  133.    * @return {boolean}
  134.    */
  135.   static isTizen5() {
  136.     return shaka.util.Platform.userAgentContains_('Tizen 5');
  137.   }
  139.   /**
  140.    * Check if the current platform is a Tizen 4 TV.
  141.    *
  142.    * @return {boolean}
  143.    */
  144.   static isTizen4() {
  145.     return shaka.util.Platform.userAgentContains_('Tizen 4');
  146.   }
  148.   /**
  149.    * Check if the current platform is a Tizen 3 TV.
  150.    *
  151.    * @return {boolean}
  152.    */
  153.   static isTizen3() {
  154.     return shaka.util.Platform.userAgentContains_('Tizen 3');
  155.   }
  157.   /**
  158.    * Check if the current platform is a Tizen 2 TV.
  159.    *
  160.    * @return {boolean}
  161.    */
  162.   static isTizen2() {
  163.     return shaka.util.Platform.userAgentContains_('Tizen 2');
  164.   }
  166.   /**
  167.    * Check if the current platform is a WebOS.
  168.    *
  169.    * @return {boolean}
  170.    */
  171.   static isWebOS() {
  172.     return shaka.util.Platform.userAgentContains_('Web0S');
  173.   }
  175.   /**
  176.    * Check if the current platform is a WebOS 3.
  177.    *
  178.    * @return {boolean}
  179.    */
  180.   static isWebOS3() {
  181.     // See: https://webostv.developer.lge.com/develop/specifications/web-api-and-web-engine#useragent-string
  182.     return shaka.util.Platform.isWebOS() &&
  183.         shaka.util.Platform.chromeVersion() === 38;
  184.   }
  186.   /**
  187.    * Check if the current platform is a WebOS 4.
  188.    *
  189.    * @return {boolean}
  190.    */
  191.   static isWebOS4() {
  192.     // See: https://webostv.developer.lge.com/develop/specifications/web-api-and-web-engine#useragent-string
  193.     return shaka.util.Platform.isWebOS() &&
  194.         shaka.util.Platform.chromeVersion() === 53;
  195.   }
  197.   /**
  198.    * Check if the current platform is a WebOS 5.
  199.    *
  200.    * @return {boolean}
  201.    */
  202.   static isWebOS5() {
  203.     // See: https://webostv.developer.lge.com/develop/specifications/web-api-and-web-engine#useragent-string
  204.     return shaka.util.Platform.isWebOS() &&
  205.         shaka.util.Platform.chromeVersion() === 68;
  206.   }
  208.   /**
  209.    * Check if the current platform is a WebOS 6.
  210.    *
  211.    * @return {boolean}
  212.    */
  213.   static isWebOS6() {
  214.     // See: https://webostv.developer.lge.com/develop/specifications/web-api-and-web-engine#useragent-string
  215.     return shaka.util.Platform.isWebOS() &&
  216.         shaka.util.Platform.chromeVersion() === 79;
  217.   }
  219.   /**
  220.    * Check if the current platform is a Google Chromecast.
  221.    *
  222.    * @return {boolean}
  223.    */
  224.   static isChromecast() {
  225.     return shaka.util.Platform.userAgentContains_('CrKey');
  226.   }
  228.   /**
  229.    * Check if the current platform is a Google Chromecast with Android
  230.    * (i.e. Chromecast with GoogleTV).
  231.    *
  232.    * @return {boolean}
  233.    */
  234.   static isAndroidCastDevice() {
  235.     const Platform = shaka.util.Platform;
  236.     return Platform.isChromecast() && Platform.isAndroid();
  237.   }
  239.   /**
  240.    * Check if the current platform is a Google Chromecast with Fuchsia
  241.    * (i.e. Google Nest Hub).
  242.    *
  243.    * @return {boolean}
  244.    */
  245.   static isFuchsiaCastDevice() {
  246.     const Platform = shaka.util.Platform;
  247.     return Platform.isChromecast() && Platform.isFuchsia();
  248.   }
  250.   /**
  251.    * Returns a major version number for Chrome, or Chromium-based browsers.
  252.    *
  253.    * For example:
  254.    *   - Chrome 106.0.5249.61 returns 106.
  255.    *   - Edge 106.0.1370.34 returns 106 (since this is based on Chromium).
  256.    *   - Safari returns null (since this is independent of Chromium).
  257.    *
  258.    * @return {?number} A major version number or null if not Chromium-based.
  259.    */
  260.   static chromeVersion() {
  261.     if (!shaka.util.Platform.isChrome()) {
  262.       return null;
  263.     }
  265.     // Looking for something like "Chrome/106.0.0.0".
  266.     const match = navigator.userAgent.match(/Chrome\/(\d+)/);
  267.     if (match) {
  268.       return parseInt(match[1], /* base= */ 10);
  269.     }
  271.     return null;
  272.   }
  274.   /**
  275.    * Check if the current platform is Google Chrome.
  276.    *
  277.    * @return {boolean}
  278.    */
  279.   static isChrome() {
  280.     // The Edge Legacy user agent will also contain the "Chrome" keyword, so we
  281.     // need to make sure this is not Edge Legacy.
  282.     return shaka.util.Platform.userAgentContains_('Chrome') &&
  283.            !shaka.util.Platform.isLegacyEdge();
  284.   }
  286.   /**
  287.    * Check if the current platform is Firefox.
  288.    *
  289.    * @return {boolean}
  290.    */
  291.   static isFirefox() {
  292.     return shaka.util.Platform.userAgentContains_('Firefox');
  293.   }
  295.   /**
  296.    * Check if the current platform is from Apple.
  297.    *
  298.    * Returns true on all iOS browsers and on desktop Safari.
  299.    *
  300.    * Returns false for non-Safari browsers on macOS, which are independent of
  301.    * Apple.
  302.    *
  303.    * @return {boolean}
  304.    */
  305.   static isApple() {
  306.     return !!navigator.vendor && navigator.vendor.includes('Apple') &&
  307.         !shaka.util.Platform.isTizen() &&
  308.         !shaka.util.Platform.isEOS() &&
  309.         !shaka.util.Platform.isAPL() &&
  310.         !shaka.util.Platform.isVirginMedia() &&
  311.         !shaka.util.Platform.isOrange() &&
  312.         !shaka.util.Platform.isPS4() &&
  313.         !shaka.util.Platform.isAmazonFireTV() &&
  314.         !shaka.util.Platform.isComcastX1() &&
  315.         !shaka.util.Platform.isZenterio() &&
  316.         !shaka.util.Platform.isSkyQ();
  317.   }
  319.   /**
  320.    * Check if the current platform is Playstation 5.
  321.    *
  322.    * Returns true on Playstation 5 browsers.
  323.    *
  324.    * Returns false for Playstation 5 browsers
  325.    *
  326.    * @return {boolean}
  327.    */
  328.   static isPS5() {
  329.     return shaka.util.Platform.userAgentContains_('PlayStation 5');
  330.   }
  332.   /**
  333.    * Check if the current platform is Playstation 4.
  334.    */
  335.   static isPS4() {
  336.     return shaka.util.Platform.userAgentContains_('PlayStation 4');
  337.   }
  339.   /**
  340.    * Check if the current platform is Hisense.
  341.    */
  342.   static isHisense() {
  343.     return shaka.util.Platform.userAgentContains_('Hisense') ||
  344.         shaka.util.Platform.userAgentContains_('VIDAA');
  345.   }
  347.   /**
  348.    * Check if the current platform is Virgin Media device.
  349.    */
  350.   static isVirginMedia() {
  351.     return shaka.util.Platform.userAgentContains_('VirginMedia');
  352.   }
  354.   /**
  355.    * Check if the current platform is Orange.
  356.    */
  357.   static isOrange() {
  358.     return shaka.util.Platform.userAgentContains_('SOPOpenBrowser');
  359.   }
  361.   /**
  362.    * Check if the current platform is SkyQ STB.
  363.    */
  364.   static isSkyQ() {
  365.     return shaka.util.Platform.userAgentContains_('Sky_STB');
  366.   }
  368.   /**
  369.    * Check if the current platform is Amazon Fire TV.
  370.    * https://developer.amazon.com/docs/fire-tv/identify-amazon-fire-tv-devices.html
  371.    *
  372.    * @return {boolean}
  373.    */
  374.   static isAmazonFireTV() {
  375.     return shaka.util.Platform.userAgentContains_('AFT');
  376.   }
  378.   /**
  379.    * Check if the current platform is Comcast X1.
  380.    * @return {boolean}
  381.    */
  382.   static isComcastX1() {
  383.     return shaka.util.Platform.userAgentContains_('WPE');
  384.   }
  386.   /**
  387.    * Check if the current platform is Deutsche Telecom Zenterio STB.
  388.    * @return {boolean}
  389.    */
  390.   static isZenterio() {
  391.     return shaka.util.Platform.userAgentContains_('DT_STB_BCM');
  392.   }
  394.   /**
  395.    * Returns a major version number for Safari, or Safari-based iOS browsers.
  396.    *
  397.    * For example:
  398.    *   - Safari 13.0.4 on macOS returns 13.
  399.    *   - Safari on iOS 13.3.1 returns 13.
  400.    *   - Chrome on iOS 13.3.1 returns 13 (since this is based on Safari/WebKit).
  401.    *   - Chrome on macOS returns null (since this is independent of Apple).
  402.    *
  403.    * Returns null on Firefox on iOS, where this version information is not
  404.    * available.
  405.    *
  406.    * @return {?number} A major version number or null if not iOS.
  407.    */
  408.   static safariVersion() {
  409.     // All iOS browsers and desktop Safari will return true for isApple().
  410.     if (!shaka.util.Platform.isApple()) {
  411.       return null;
  412.     }
  414.     // This works for iOS Safari and desktop Safari, which contain something
  415.     // like "Version/13.0" indicating the major Safari or iOS version.
  416.     let match = navigator.userAgent.match(/Version\/(\d+)/);
  417.     if (match) {
  418.       return parseInt(match[1], /* base= */ 10);
  419.     }
  421.     // This works for all other browsers on iOS, which contain something like
  422.     // "OS 13_3" indicating the major & minor iOS version.
  423.     match = navigator.userAgent.match(/OS (\d+)(?:_\d+)?/);
  424.     if (match) {
  425.       return parseInt(match[1], /* base= */ 10);
  426.     }
  428.     return null;
  429.   }
  431.   /**
  432.    * Check if the current platform is Apple Safari
  433.    * or Safari-based iOS browsers.
  434.    *
  435.    * @return {boolean}
  436.    */
  437.   static isSafari() {
  438.     return !!shaka.util.Platform.safariVersion();
  439.   }
  441.   /**
  442.    * Check if the current platform is an EOS set-top box.
  443.    *
  444.    * @return {boolean}
  445.    */
  446.   static isEOS() {
  447.     return shaka.util.Platform.userAgentContains_('PC=EOS');
  448.   }
  450.   /**
  451.    * Check if the current platform is an APL set-top box.
  452.    *
  453.    * @return {boolean}
  454.    */
  455.   static isAPL() {
  456.     return shaka.util.Platform.userAgentContains_('PC=APL');
  457.   }
  459.   /**
  460.    * Guesses if the platform is a mobile one (iOS or Android).
  461.    *
  462.    * @return {boolean}
  463.    */
  464.   static isMobile() {
  465.     if (/(?:iPhone|iPad|iPod|Android)/.test(navigator.userAgent)) {
  466.       // This is Android, iOS, or iPad < 13.
  467.       return true;
  468.     }
  470.     // Starting with iOS 13 on iPad, the user agent string no longer has the
  471.     // word "iPad" in it.  It looks very similar to desktop Safari.  This seems
  472.     // to be intentional on Apple's part.
  473.     // See: https://forums.developer.apple.com/thread/119186
  474.     //
  475.     // So if it's an Apple device with multi-touch support, assume it's a mobile
  476.     // device.  If some future iOS version starts masking their user agent on
  477.     // both iPhone & iPad, this clause should still work.  If a future
  478.     // multi-touch desktop Mac is released, this will need some adjustment.
  479.     //
  480.     // As of January 2020, this is mainly used to adjust the default UI config
  481.     // for mobile devices, so it's low risk if something changes to break this
  482.     // detection.
  483.     return shaka.util.Platform.isApple() && navigator.maxTouchPoints > 1;
  484.   }
  486.   /**
  487.    * Return true if the platform is a Mac, regardless of the browser.
  488.    *
  489.    * @return {boolean}
  490.    */
  491.   static isMac() {
  492.     // Try the newer standard first.
  493.     if (navigator.userAgentData && navigator.userAgentData.platform) {
  494.       return navigator.userAgentData.platform.toLowerCase() == 'macos';
  495.     }
  496.     // Fall back to the old API, with less strict matching.
  497.     if (!navigator.platform) {
  498.       return false;
  499.     }
  500.     return navigator.platform.toLowerCase().includes('mac');
  501.   }
  503.   /**
  504.    * Return true if the platform is a Windows, regardless of the browser.
  505.    *
  506.    * @return {boolean}
  507.    */
  508.   static isWindows() {
  509.     // Try the newer standard first.
  510.     if (navigator.userAgentData && navigator.userAgentData.platform) {
  511.       return navigator.userAgentData.platform.toLowerCase() == 'windows';
  512.     }
  513.     // Fall back to the old API, with less strict matching.
  514.     if (!navigator.platform) {
  515.       return false;
  516.     }
  517.     return navigator.platform.toLowerCase().includes('win32');
  518.   }
  520.   /**
  521.    * Return true if the platform is a Android, regardless of the browser.
  522.    *
  523.    * @return {boolean}
  524.    */
  525.   static isAndroid() {
  526.     return shaka.util.Platform.userAgentContains_('Android');
  527.   }
  529.   /**
  530.    * Return true if the platform is a Fuchsia, regardless of the browser.
  531.    *
  532.    * @return {boolean}
  533.    */
  534.   static isFuchsia() {
  535.     return shaka.util.Platform.userAgentContains_('Fuchsia');
  536.   }
  538.   /**
  539.    * Return true if the platform is controlled by a remote control.
  540.    *
  541.    * @return {boolean}
  542.    */
  543.   static isSmartTV() {
  544.     const Platform = shaka.util.Platform;
  545.     if (Platform.isTizen() || Platform.isWebOS() ||
  546.         Platform.isXboxOne() || Platform.isPS4() ||
  547.         Platform.isPS5() || Platform.isAmazonFireTV() ||
  548.         Platform.isEOS() || Platform.isAPL() ||
  549.         Platform.isVirginMedia() || Platform.isOrange() ||
  550.         Platform.isComcastX1() || Platform.isChromecast() ||
  551.         Platform.isHisense() || Platform.isZenterio()) {
  552.       return true;
  553.     }
  554.     return false;
  555.   }
  557.   /**
  558.    * Check if the user agent contains a key. This is the best way we know of
  559.    * right now to detect platforms. If there is a better way, please send a
  560.    * PR.
  561.    *
  562.    * @param {string} key
  563.    * @return {boolean}
  564.    * @private
  565.    */
  566.   static userAgentContains_(key) {
  567.     const userAgent = navigator.userAgent || '';
  568.     return userAgent.includes(key);
  569.   }
  571.   /**
  572.    * For canPlayType queries, we just need any instance.
  573.    *
  574.    * First, use a cached element from a previous query.
  575.    * Second, search the page for one.
  576.    * Third, create a temporary one.
  577.    *
  578.    * Cached elements expire in one second so that they can be GC'd or removed.
  579.    *
  580.    * @return {!HTMLMediaElement}
  581.    */
  582.   static anyMediaElement() {
  583.     const Platform = shaka.util.Platform;
  584.     if (Platform.cachedMediaElement_) {
  585.       return Platform.cachedMediaElement_;
  586.     }
  588.     if (!Platform.cacheExpirationTimer_) {
  589.       Platform.cacheExpirationTimer_ = new shaka.util.Timer(() => {
  590.         Platform.cachedMediaElement_ = null;
  591.       });
  592.     }
  594.     Platform.cachedMediaElement_ = /** @type {HTMLMediaElement} */(
  595.       document.getElementsByTagName('video')[0] ||
  596.       document.getElementsByTagName('audio')[0]);
  598.     if (!Platform.cachedMediaElement_) {
  599.       Platform.cachedMediaElement_ = /** @type {!HTMLMediaElement} */(
  600.         document.createElement('video'));
  601.     }
  603.     Platform.cacheExpirationTimer_.tickAfter(/* seconds= */ 1);
  604.     return Platform.cachedMediaElement_;
  605.   }
  607.   /**
  608.    * Returns true if the platform requires encryption information in all init
  609.    * segments.  For such platforms, MediaSourceEngine will attempt to work
  610.    * around a lack of such info by inserting fake encryption information into
  611.    * initialization segments.
  612.    *
  613.    * @param {?string} keySystem
  614.    * @return {boolean}
  615.    * @see https://github.com/shaka-project/shaka-player/issues/2759
  616.    */
  617.   static requiresEncryptionInfoInAllInitSegments(keySystem) {
  618.     const Platform = shaka.util.Platform;
  619.     const isPlayReady = shaka.util.DrmUtils.isPlayReadyKeySystem(keySystem);
  620.     return Platform.isTizen() || Platform.isXboxOne() || Platform.isOrange() ||
  621.       (Platform.isEdge() && Platform.isWindows() && isPlayReady);
  622.   }
  624.   /**
  625.    * Returns true if the platform supports SourceBuffer "sequence mode".
  626.    *
  627.    * @return {boolean}
  628.    */
  629.   static supportsSequenceMode() {
  630.     const Platform = shaka.util.Platform;
  631.     if (Platform.isTizen3() || Platform.isTizen2() ||
  632.         Platform.isWebOS3() || Platform.isPS4()) {
  633.       return false;
  634.     }
  635.     return true;
  636.   }
  638.   /**
  639.    * Returns if codec switching SMOOTH is known reliable device support.
  640.    *
  641.    * Some devices are known not to support <code>SourceBuffer.changeType</code>
  642.    * well. These devices should use the reload strategy. If a device
  643.    * reports that it supports <code<changeType</code> but supports it unreliably
  644.    * it should be disallowed in this method.
  645.    *
  646.    * @return {boolean}
  647.    */
  648.   static supportsSmoothCodecSwitching() {
  649.     const Platform = shaka.util.Platform;
  650.     // All Tizen versions (up to Tizen 8) do not support SMOOTH so far.
  651.     // webOS seems to support SMOOTH from webOS 22.
  652.     if (Platform.isTizen() || Platform.isPS4() || Platform.isPS5() ||
  653.         Platform.isWebOS6()) {
  654.       return false;
  655.     }
  656.     // Older chromecasts without GoogleTV seem to not support SMOOTH properly.
  657.     if (Platform.isChromecast() && !Platform.isAndroidCastDevice() &&
  658.         !Platform.isFuchsiaCastDevice()) {
  659.       return false;
  660.     }
  661.     // See: https://chromium-review.googlesource.com/c/chromium/src/+/4577759
  662.     if (Platform.isWindows() && Platform.isEdge()) {
  663.       return false;
  664.     }
  665.     return true;
  666.   }
  668.   /**
  669.    * On some platforms, such as v1 Chromecasts, the act of seeking can take a
  670.    * significant amount of time.
  671.    *
  672.    * @return {boolean}
  673.    */
  674.   static isSeekingSlow() {
  675.     const Platform = shaka.util.Platform;
  676.     if (Platform.isChromecast()) {
  677.       if (Platform.isAndroidCastDevice()) {
  678.         // Android-based Chromecasts are new enough to not be a problem.
  679.         return false;
  680.       } else {
  681.         return true;
  682.       }
  683.     }
  684.     return false;
  685.   }
  687.   /**
  688.    * Returns true if MediaKeys is polyfilled
  689.    *
  690.    * @param {string=} polyfillType
  691.    * @return {boolean}
  692.    */
  693.   static isMediaKeysPolyfilled(polyfillType) {
  694.     if (polyfillType) {
  695.       return polyfillType === window.shakaMediaKeysPolyfill;
  696.     }
  697.     return !!window.shakaMediaKeysPolyfill;
  698.   }
  701.   /**
  702.    * Detect the maximum resolution that the platform's hardware can handle.
  703.    *
  704.    * @return {!Promise.<shaka.extern.Resolution>}
  705.    */
  706.   static async detectMaxHardwareResolution() {
  707.     const Platform = shaka.util.Platform;
  709.     /** @type {shaka.extern.Resolution} */
  710.     const maxResolution = {
  711.       width: Infinity,
  712.       height: Infinity,
  713.     };
  715.     if (Platform.isChromecast()) {
  716.       // In our tests, the original Chromecast seems to have trouble decoding
  717.       // above 1080p. It would be a waste to select a higher res anyway, given
  718.       // that the device only outputs 1080p to begin with.
  719.       // Chromecast has an extension to query the device/display's resolution.
  720.       const hasCanDisplayType = window.cast && cast.__platform__ &&
  721.           cast.__platform__.canDisplayType;
  723.       // Some hub devices can only do 720p. Default to that.
  724.       maxResolution.width = 1280;
  725.       maxResolution.height = 720;
  727.       try {
  728.         if (hasCanDisplayType && await cast.__platform__.canDisplayType(
  729.             'video/mp4; codecs="avc1.640028"; width=3840; height=2160')) {
  730.           // The device and display can both do 4k. Assume a 4k limit.
  731.           maxResolution.width = 3840;
  732.           maxResolution.height = 2160;
  733.         } else if (hasCanDisplayType && await cast.__platform__.canDisplayType(
  734.             'video/mp4; codecs="avc1.640028"; width=1920; height=1080')) {
  735.           // Most Chromecasts can do 1080p.
  736.           maxResolution.width = 1920;
  737.           maxResolution.height = 1080;
  738.         }
  739.       } catch (error) {
  740.         // This shouldn't generally happen. Log the error.
  741.         shaka.log.alwaysError('Failed to check canDisplayType:', error);
  742.         // Now ignore the error and let the 720p default stand.
  743.       }
  744.     } else if (Platform.isTizen()) {
  745.       maxResolution.width = 1920;
  746.       maxResolution.height = 1080;
  747.       try {
  748.         if (webapis.systeminfo && webapis.systeminfo.getMaxVideoResolution) {
  749.           const maxVideoResolution =
  750.               webapis.systeminfo.getMaxVideoResolution();
  751.           maxResolution.width = maxVideoResolution.width;
  752.           maxResolution.height = maxVideoResolution.height;
  753.         } else {
  754.           if (webapis.productinfo.is8KPanelSupported &&
  755.               webapis.productinfo.is8KPanelSupported()) {
  756.             maxResolution.width = 7680;
  757.             maxResolution.height = 4320;
  758.           } else if (webapis.productinfo.isUdPanelSupported &&
  759.               webapis.productinfo.isUdPanelSupported()) {
  760.             maxResolution.width = 3840;
  761.             maxResolution.height = 2160;
  762.           }
  763.         }
  764.       } catch (e) {
  765.         shaka.log.alwaysWarn('Tizen: Error detecting screen size, default ' +
  766.             'screen size 1920x1080.');
  767.       }
  768.     } else if (Platform.isWebOS()) {
  769.       try {
  770.         const deviceInfo =
  771.         /** @type {{screenWidth: number, screenHeight: number}} */(
  772.             JSON.parse(window.PalmSystem.deviceInfo));
  773.         // WebOS has always been able to do 1080p.  Assume a 1080p limit.
  774.         maxResolution.width = Math.max(1920, deviceInfo['screenWidth']);
  775.         maxResolution.height = Math.max(1080, deviceInfo['screenHeight']);
  776.       } catch (e) {
  777.         shaka.log.alwaysWarn('WebOS: Error detecting screen size, default ' +
  778.             'screen size 1920x1080.');
  779.         maxResolution.width = 1920;
  780.         maxResolution.height = 1080;
  781.       }
  782.     } else if (Platform.isHisense()) {
  783.       // eslint-disable-next-line new-cap
  784.       if (window.Hisense_Get4KSupportState &&
  785.           // eslint-disable-next-line new-cap
  786.           window.Hisense_Get4KSupportState()) {
  787.         maxResolution.width = 3840;
  788.         maxResolution.height = 2160;
  789.       } else {
  790.         maxResolution.width = 1920;
  791.         maxResolution.height = 1080;
  792.       }
  793.     } else if (Platform.isPS4() || Platform.isPS5()) {
  794.       let supports4K = false;
  795.       try {
  796.         const result = await window.msdk.device.getDisplayInfo();
  797.         supports4K = result.resolution === '4K';
  798.       } catch (e) {
  799.         try {
  800.           const result = await window.msdk.device.getDisplayInfoImmediate();
  801.           supports4K = result.resolution === '4K';
  802.         } catch (e) {
  803.           shaka.log.alwaysWarn(
  804.               'PlayStation: Failed to get the display info:', e);
  805.         }
  806.       }
  807.       if (supports4K) {
  808.         maxResolution.width = 3840;
  809.         maxResolution.height = 2160;
  810.       } else {
  811.         maxResolution.width = 1920;
  812.         maxResolution.height = 1080;
  813.       }
  814.     } else {
  815.       // For Xbox and UWP apps.
  816.       let winRT = undefined;
  817.       try {
  818.         // Try to access to WinRT for WebView, if it's not defined,
  819.         // try to access to WinRT for WebView2, if it's not defined either,
  820.         // let it throw.
  821.         if (typeof Windows !== 'undefined') {
  822.           winRT = Windows;
  823.         } else {
  824.           winRT = chrome.webview.hostObjects.sync.Windows;
  825.         }
  826.       } catch (e) {}
  827.       if (winRT) {
  828.         maxResolution.width = 1920;
  829.         maxResolution.height = 1080;
  830.         try {
  831.           const protectionCapabilities =
  832.               new winRT.Media.Protection.ProtectionCapabilities();
  833.           const protectionResult =
  834.               winRT.Media.Protection.ProtectionCapabilityResult;
  835.           // isTypeSupported may return "maybe", which means the operation
  836.           // is not completed. This means we need to retry
  837.           // https://learn.microsoft.com/en-us/uwp/api/windows.media.protection.protectioncapabilityresult?view=winrt-22621
  838.           let result = null;
  839.           const type =
  840.               'video/mp4;codecs="hvc1,mp4a";features="decode-res-x=3840,' +
  841.               'decode-res-y=2160,decode-bitrate=20000,decode-fps=30,' +
  842.               'decode-bpc=10,display-res-x=3840,display-res-y=2160,' +
  843.               'display-bpc=8"';
  844.           const keySystem = 'com.microsoft.playready.recommendation';
  845.           do {
  846.             result = protectionCapabilities.isTypeSupported(type, keySystem);
  847.           } while (result === protectionResult.maybe);
  848.           if (result === protectionResult.probably) {
  849.             maxResolution.width = 3840;
  850.             maxResolution.height = 2160;
  851.           }
  852.         } catch (e) {
  853.           shaka.log.alwaysWarn('Xbox: Error detecting screen size, default ' +
  854.               'screen size 1920x1080.');
  855.         }
  856.       } else if (Platform.isXboxOne()) {
  857.         maxResolution.width = 1920;
  858.         maxResolution.height = 1080;
  859.         shaka.log.alwaysWarn('Xbox: Error detecting screen size, default ' +
  860.             'screen size 1920x1080.');
  861.       }
  862.     }
  863.     return maxResolution;
  864.   }
  865. };
  867. /** @private {shaka.util.Timer} */
  868. shaka.util.Platform.cacheExpirationTimer_ = null;
  870. /** @private {HTMLMediaElement} */
  871. shaka.util.Platform.cachedMediaElement_ = null;