Ensure chunk duration is set in CmcdData for HLS media

Previously, encrypted media segments did not have the chunk duration set,
causing an assertion failure during `CmcdData` creation. With this change,
the chunk duration is always set, while `CmcdData` ensures it is applied
only for media chunks.

Issue: #2312
PiperOrigin-RevId: 745196718

Author: rohitjoins

RELEASENOTES.md

@@ -80,6 +80,9 @@
 *   Cronet extension:
 *   RTMP extension:
 *   HLS extension:
+    *   Fix issue where chunk duration wasn't set in `CmcdData` for HLS media,
+        causing an assertion failure when processing encrypted media segments
+        ([#2312](https://github.com/androidx/media/issues/2312)).
 *   DASH extension:
 *   Smooth Streaming extension:
 *   RTSP extension:

libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsChunkSource.java

@@ -517,7 +517,8 @@ public void getNextChunk(
               .setPlaybackRate(loadingInfo.playbackSpeed)
               .setIsLive(!playlist.hasEndTag)
               .setDidRebuffer(loadingInfo.rebufferedSince(lastChunkRequestRealtimeMs))
-              .setIsBufferEmpty(queue.isEmpty());
+              .setIsBufferEmpty(queue.isEmpty())
+              .setChunkDurationUs(segmentBaseHolder.segmentBase.durationUs);
       long nextMediaSequence =
           segmentBaseHolder.partIndex == C.INDEX_UNSET
               ? segmentBaseHolder.mediaSequence + 1

libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsMediaChunk.java

@@ -112,8 +112,7 @@ public static HlsMediaChunk createInstance(
             .setFlags(segmentBaseHolder.isPreload ? FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED : 0)
             .build();
     if (cmcdDataFactory != null) {
-      CmcdData cmcdData =
-          cmcdDataFactory.setChunkDurationUs(mediaSegment.durationUs).createCmcdData();
+      CmcdData cmcdData = cmcdDataFactory.createCmcdData();
       dataSpec = cmcdData.addToDataSpec(dataSpec);
     }