feat: Support for XOne devices

lib/media/time_ranges_utils.js

@@ -6,6 +6,7 @@
 
 goog.provide('shaka.media.TimeRangesUtils');
 
+goog.require('shaka.util.Platform');
 
 /**
  * @summary A set of utility functions for dealing with TimeRanges objects.
@@ -106,13 +107,17 @@ shaka.media.TimeRangesUtils = class {
       return 0;
     }
 
+    // NOTE: The 0.1ms fudge is needed on XOne,
+    // where removal up to X may leave
+    // a range which starts at X + 1us + some small epsilon.
+    const fudge = shaka.util.Platform.isXOne() ? 0.001 : 0;
     // We calculate the buffered amount by ONLY accounting for the content
     // buffered (i.e. we ignore the times of the gaps).  We also buffer through
     // all gaps.
     // Therefore, we start at the end and add up all buffers until |time|.
     let result = 0;
     for (const {start, end} of shaka.media.TimeRangesUtils.getBufferedInfo(b)) {
-      if (end > time) {
+      if (time + fudge >= start && end > time) {
         result += end - Math.max(start, time);
       }
     }

lib/polyfill/media_capabilities.js

@@ -61,7 +61,8 @@ shaka.polyfill.MediaCapabilities = class {
         shaka.util.Platform.isWebOS() ||
         shaka.util.Platform.isTizen() ||
         shaka.util.Platform.isEOS() ||
-        shaka.util.Platform.isHisense()) {
+        shaka.util.Platform.isHisense() ||
+        shaka.util.Platform.isXOne()) {
       canUseNativeMCap = false;
     }
     if (canUseNativeMCap && navigator.mediaCapabilities) {

lib/polyfill/mediasource.js

@@ -87,6 +87,18 @@ shaka.polyfill.MediaSource = class {
       // the player from trying to play opus on Tizen, we will override media
       // source to always reject opus content.
       shaka.polyfill.MediaSource.rejectCodec_('opus');
+    } else if (shaka.util.Platform.isXOne()) {
+      // XOne look to be like safari 8 which do not correctly
+      // implement abort() on SourceBuffer.
+      // Calling abort() before appending a segment causes that segment to be
+      // incomplete in the buffer.
+      // Bug filed: https://bugs.webkit.org/show_bug.cgi?id=165342
+      shaka.polyfill.MediaSource.stubAbort_();
+      // If you remove up to a keyframe, Webkit 601.x.x incorrectly will also
+      // remove that keyframe and the content up to the next.
+      // Offsetting the end of the removal range seems to help.
+      // Bug filed: https://bugs.webkit.org/show_bug.cgi?id=177884
+      shaka.polyfill.MediaSource.patchRemovalRange_();
     } else {
       shaka.log.info('Using native MSE as-is.');
     }

lib/util/platform.js

@@ -302,7 +302,8 @@ shaka.util.Platform = class {
         !shaka.util.Platform.isAmazonFireTV() &&
         !shaka.util.Platform.isWPE() &&
         !shaka.util.Platform.isZenterio() &&
-        !shaka.util.Platform.isSkyQ();
+        !shaka.util.Platform.isSkyQ() &&
+        !shaka.util.Platform.isXOne();
   }
 
   /**
@@ -354,6 +355,15 @@ shaka.util.Platform = class {
     return shaka.util.Platform.userAgentContains_('Sky_STB');
   }
 
+  /**
+   * Check if the current platform is XOne.
+   */
+  static isXOne() {
+    return navigator.platform &&
+        navigator.platform.includes('Linux aarch64') &&
+        shaka.util.Platform.userAgentContains_('AppleWebKit');
+  }
+
   /**
    * Check if the current platform is Amazon Fire TV.
    * https://developer.amazon.com/docs/fire-tv/identify-amazon-fire-tv-devices.html
@@ -537,7 +547,8 @@ shaka.util.Platform = class {
         Platform.isEOS() || Platform.isAPL() ||
         Platform.isVirginMedia() || Platform.isOrange() ||
         Platform.isWPE() || Platform.isChromecast() ||
-        Platform.isHisense() || Platform.isZenterio()) {
+        Platform.isHisense() || Platform.isZenterio() ||
+        Platform.isXOne()) {
       return true;
     }
     return false;
@@ -639,7 +650,7 @@ shaka.util.Platform = class {
     if (Platform.isTizen2() || Platform.isTizen3() || Platform.isTizen4() ||
         Platform.isTizen5() || Platform.isTizen6() || Platform.isWebOS3() ||
         Platform.isWebOS4() || Platform.isWebOS5() || Platform.isPS4() ||
-        Platform.isPS5()) {
+        Platform.isPS5() || Platform.isXOne()) {
       return false;
     }
     // Older chromecasts without GoogleTV seem to not support SMOOTH properly.