HLS: Set initial SampleQueue start times

This ensures BUFFER_FLAG_DECODE_ONLY is set on samples that are
before the playback start position, in the case that the queue
is created after the start position is set.

#minor-release

PiperOrigin-RevId: 366249188

RELEASENOTES.md

@@ -43,6 +43,9 @@
         `EXT-X-DISCONTINUITY` tags in different media playlists occur at
         different positions in time
         ([#8372](https://github.com/google/ExoPlayer/issues/8372)).
+    *   Fix issue that could cause playback of on-demand content to not start in
+        cases where the media playlists referenced by the master playlist have
+        different starting `EXT-X-PROGRAM-DATE-TIME` tags.
     *   Fix container type detection for segments with incorrect file extension
         or HTTP Content-Type
         ([#8733](https://github.com/google/ExoPlayer/issues/8733)).

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsSampleStreamWrapper.java

@@ -1070,6 +1070,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
             drmSessionManager,
             drmEventDispatcher,
             overridingDrmInitData);
+    sampleQueue.setStartTimeUs(lastSeekPositionUs);
     if (isAudioVideo) {
       sampleQueue.setDrmInitData(drmInitData);
     }