feat(MSS): Add support for MediaQualityInfo events

lib/media/quality_observer.js

@@ -11,6 +11,7 @@ goog.require('shaka.log');
 goog.require('shaka.util.ArrayUtils');
 goog.require('shaka.util.FakeEvent');
 goog.require('shaka.util.FakeEventTarget');
+goog.require('shaka.util.ManifestParserUtils');
 
 /**
  * Monitors the quality of content being appended to the source buffers and
@@ -153,29 +154,23 @@ shaka.media.QualityObserver = class extends shaka.util.FakeEventTarget {
   /** @override */
   poll(positionInSeconds, wasSeeking) {
     for (const contentTypeState of this.contentTypeStates_.values()) {
+      const currentQuality = contentTypeState.currentQuality;
       const qualityAtPosition =
         shaka.media.QualityObserver.getMediaQualityAtPosition_(
             positionInSeconds, contentTypeState);
 
       const differentQualities = qualityAtPosition &&
           !shaka.media.QualityObserver.mediaQualitiesAreTheSame_(
-              contentTypeState.currentQuality, qualityAtPosition);
-      const differentLabel = qualityAtPosition &&
-          contentTypeState.currentQuality &&
-          qualityAtPosition.label &&
-          contentTypeState.currentQuality.label &&
-          contentTypeState.currentQuality.label !== qualityAtPosition.label;
-      const differentLanguage = qualityAtPosition &&
-          contentTypeState.currentQuality &&
-          qualityAtPosition.language &&
-          contentTypeState.currentQuality.language &&
-          contentTypeState.currentQuality.language !==
-              qualityAtPosition.language;
-      const differentRoles = qualityAtPosition &&
-          contentTypeState.currentQuality &&
-          qualityAtPosition.roles &&
-          contentTypeState.currentQuality.roles &&
-          !shaka.util.ArrayUtils.equal(contentTypeState.currentQuality.roles,
+              currentQuality, qualityAtPosition);
+      const differentLabel = qualityAtPosition && currentQuality &&
+          qualityAtPosition.label && currentQuality.label &&
+          currentQuality.label !== qualityAtPosition.label;
+      const differentLanguage = qualityAtPosition && currentQuality &&
+          qualityAtPosition.language && currentQuality.language &&
+          currentQuality.language !== qualityAtPosition.language;
+      const differentRoles = qualityAtPosition && currentQuality &&
+          qualityAtPosition.roles && currentQuality.roles &&
+          !shaka.util.ArrayUtils.equal(currentQuality.roles,
               qualityAtPosition.roles);
 
       if (differentLabel || differentLanguage || differentRoles) {
@@ -266,6 +261,43 @@ shaka.media.QualityObserver = class extends shaka.util.FakeEventTarget {
       contentTypeState.qualityChangePositions = [];
     }
   }
+
+  /**
+   * Create a MediaQualityInfo object from a stream object.
+   *
+   * @param {!shaka.extern.Stream} stream
+   * @return {!shaka.extern.MediaQualityInfo}
+   */
+  static createQualityInfo(stream) {
+    const basicQuality = {
+      bandwidth: stream.bandwidth || 0,
+      audioSamplingRate: null,
+      codecs: stream.codecs,
+      contentType: stream.type,
+      frameRate: null,
+      height: null,
+      mimeType: stream.mimeType,
+      channelsCount: null,
+      pixelAspectRatio: null,
+      width: null,
+      label: null,
+      roles: stream.roles,
+      language: null,
+    };
+    if (stream.type == shaka.util.ManifestParserUtils.ContentType.VIDEO) {
+      basicQuality.frameRate = stream.frameRate || null;
+      basicQuality.height = stream.height || null;
+      basicQuality.pixelAspectRatio = stream.pixelAspectRatio || null;
+      basicQuality.width = stream.width || null;
+    }
+    if (stream.type == shaka.util.ManifestParserUtils.ContentType.AUDIO) {
+      basicQuality.audioSamplingRate = stream.audioSamplingRate;
+      basicQuality.channelsCount = stream.channelsCount;
+      basicQuality.label = stream.label || null;
+      basicQuality.language = stream.language;
+    }
+    return basicQuality;
+  }
 };
 
 /**

lib/mss/mss_parser.js

@@ -13,6 +13,7 @@ goog.require('shaka.log');
 goog.require('shaka.media.InitSegmentReference');
 goog.require('shaka.media.ManifestParser');
 goog.require('shaka.media.PresentationTimeline');
+goog.require('shaka.media.QualityObserver');
 goog.require('shaka.media.SegmentIndex');
 goog.require('shaka.media.SegmentReference');
 goog.require('shaka.mss.ContentProtection');
@@ -708,12 +709,14 @@ shaka.mss.MssParser = class {
         initSegmentData = mp4Generator.initSegment();
         this.initSegmentDataByStreamId_.set(stream.id, initSegmentData);
       }
+      const qualityInfo =
+          shaka.media.QualityObserver.createQualityInfo(stream);
       const initSegmentRef = new shaka.media.InitSegmentReference(
           () => [],
           /* startByte= */ 0,
           /* endByte= */ null,
-          /* mediaQuality= */ null,
-          /* timescale= */ undefined,
+          qualityInfo,
+          stream.mssPrivateData.timescale,
           initSegmentData);
 
       const segments = this.createSegments_(initSegmentRef,

lib/player.js

@@ -174,7 +174,7 @@ goog.requireType('shaka.media.PresentationTimeline');
  * @description Fired when the media quality changes at the playhead.
  * That may be caused by an adaptation change or a DASH period transition.
  * Separate events are emitted for audio and video contentTypes.
- * This is supported for only DASH streams at this time.
+ * This is supported for only DASH and MSS streams at this time.
  * @property {string} type
  *   'mediaqualitychanged'
  * @property {shaka.extern.MediaQualityInfo} mediaQuality
@@ -188,7 +188,7 @@ goog.requireType('shaka.media.PresentationTimeline');
  * @event shaka.Player.AudioTrackChangedEvent
  * @description Fired when the audio track changes at the playhead.
  * That may be caused by a user requesting to chang audio tracks.
- * This is supported for only DASH streams at this time.
+ * This is supported for only DASH and MSS streams at this time.
  * @property {string} type
  *   'audiotrackchanged'
  * @property {shaka.extern.MediaQualityInfo} mediaQuality