fix(HLS): getPlayheadTimeAsDate() differs from X-EXT-PROGRAM-DATE-TIME (

shaka-project#6059) Fixes shaka-project#5939
theodab · Jan 9, 2024 · 776b69d · 776b69d
1 parent 4022788
commit 776b69d
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diff --git a/lib/hls/hls_parser.js b/lib/hls/hls_parser.js
@@ -979,6 +979,22 @@ shaka.hls.HlsParser = class {
         this.presentationTimeline_.setSegmentAvailabilityDuration(
             segmentAvailabilityDuration);
       }
+
+      if (!this.presentationTimeline_.isStartTimeLocked()) {
+        const streamInfos = Array.from(this.uriToStreamInfosMap_.values());
+        const activeStreamInfos =
+            streamInfos.filter((s) => s.stream.segmentIndex);
+        for (const streamInfo of activeStreamInfos) {
+          if (streamInfo.type != 'audio' && streamInfo.type != 'video') {
+            continue;
+          }
+          const firstReference = streamInfo.stream.segmentIndex.get(0);
+          if (firstReference && firstReference.syncTime) {
+            const syncTime = firstReference.syncTime;
+            this.presentationTimeline_.setPresentationStartTime(syncTime);
+          }
+        }
+      }
     } else {
       // Use the minimum duration as the presentation duration.
       this.presentationTimeline_.setDuration(this.getMinDuration_());

diff --git a/lib/media/presentation_timeline.js b/lib/media/presentation_timeline.js
@@ -328,6 +328,17 @@ shaka.media.PresentationTimeline = class {
   }
 
 
+  /**
+   * Returns if the presentation timeline's start time is locked.
+   *
+   * @return {boolean}
+   * @export
+   */
+  isStartTimeLocked() {
+    return this.startTimeLocked_;
+  }
+
+
   /**
    * Gives PresentationTimeline a Stream's minimum segment start time.
    *