Replace PeriodSeekInfo by static methods.

The inner class was only used to obtain 3 distinct pieces of
information which is better handled by static methods.

#exofixit

PiperOrigin-RevId: 344767661

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java

@@ -891,15 +891,12 @@ public final class DashMediaSource extends BaseMediaSource {
     Period lastPeriod = manifest.getPeriod(lastPeriodIndex);
     long lastPeriodDurationUs = manifest.getPeriodDurationUs(lastPeriodIndex);
     long nowUnixTimeUs = C.msToUs(Util.getNowUnixTimeMs(elapsedRealtimeOffsetMs));
-    PeriodSeekInfo firstPeriodSeekInfo =
-        PeriodSeekInfo.createPeriodSeekInfo(
-            manifest.getPeriod(0), manifest.getPeriodDurationUs(0), nowUnixTimeUs);
-    PeriodSeekInfo lastPeriodSeekInfo =
-        PeriodSeekInfo.createPeriodSeekInfo(lastPeriod, lastPeriodDurationUs, nowUnixTimeUs);
     // Get the period-relative start/end times.
-    long currentStartTimeUs = firstPeriodSeekInfo.availableStartTimeUs;
+    long currentStartTimeUs =
-    long currentEndTimeUs = lastPeriodSeekInfo.availableEndTimeUs;
+        getAvailableStartTimeUs(
-    if (manifest.dynamic && !lastPeriodSeekInfo.isIndexExplicit) {
+            manifest.getPeriod(0), manifest.getPeriodDurationUs(0), nowUnixTimeUs);
+    long currentEndTimeUs = getAvailableEndTimeUs(lastPeriod, lastPeriodDurationUs, nowUnixTimeUs);
+    if (manifest.dynamic && !isIndexExplicit(lastPeriod)) {
       // The manifest describes an incomplete live stream. Update the start/end times to reflect the
       // live stream duration and the manifest's time shift buffer depth.
       long liveStreamEndPositionInLastPeriodUs = currentEndTimeUs - C.msToUs(lastPeriod.startMs);
@@ -1141,74 +1138,86 @@ public final class DashMediaSource extends BaseMediaSource {
     return LongMath.divide(intervalUs, 1000, RoundingMode.CEILING);
   }
 
-  private static final class PeriodSeekInfo {
+  private static long getAvailableStartTimeUs(
-
+      Period period, long periodDurationUs, long nowUnixTimeUs) {
-    public static PeriodSeekInfo createPeriodSeekInfo(
+    long availableStartTimeUs = 0;
-        Period period, long periodDurationUs, long nowUnixTimeUs) {
+    boolean haveAudioVideoAdaptationSets = hasVideoOrAudioAdaptationSets(period);
-      int adaptationSetCount = period.adaptationSets.size();
+    for (int i = 0; i < period.adaptationSets.size(); i++) {
-      long availableStartTimeUs = 0;
+      AdaptationSet adaptationSet = period.adaptationSets.get(i);
-      long availableEndTimeUs = Long.MAX_VALUE;
+      List<Representation> representations = adaptationSet.representations;
-      boolean isIndexExplicit = false;
+      // Exclude text adaptation sets from duration calculations, if we have at least one audio
-      boolean seenEmptyIndex = false;
+      // or video adaptation set. See: https://github.com/google/ExoPlayer/issues/4029
-
+      if ((haveAudioVideoAdaptationSets && adaptationSet.type == C.TRACK_TYPE_TEXT)
-      boolean haveAudioVideoAdaptationSets = false;
+          || representations.isEmpty()) {
-      for (int i = 0; i < adaptationSetCount; i++) {
+        continue;
-        int type = period.adaptationSets.get(i).type;
-        if (type == C.TRACK_TYPE_AUDIO || type == C.TRACK_TYPE_VIDEO) {
-          haveAudioVideoAdaptationSets = true;
-          break;
-        }
       }
-
+      @Nullable DashSegmentIndex index = representations.get(0).getIndex();
-      for (int i = 0; i < adaptationSetCount; i++) {
+      if (index == null) {
-        AdaptationSet adaptationSet = period.adaptationSets.get(i);
+        return 0;
-        List<Representation> representations = adaptationSet.representations;
-        // Exclude text adaptation sets from duration calculations, if we have at least one audio
-        // or video adaptation set. See: https://github.com/google/ExoPlayer/issues/4029
-        if ((haveAudioVideoAdaptationSets && adaptationSet.type == C.TRACK_TYPE_TEXT)
-            || representations.isEmpty()) {
-          continue;
-        }
-
-        @Nullable DashSegmentIndex index = representations.get(0).getIndex();
-        if (index == null) {
-          return new PeriodSeekInfo(
-              /* isIndexExplicit= */ true,
-              /* availableStartTimeUs= */ 0,
-              /* availableEndTimeUs= */ periodDurationUs);
-        }
-        isIndexExplicit |= index.isExplicit();
-        int availableSegmentCount = index.getAvailableSegmentCount(periodDurationUs, nowUnixTimeUs);
-        if (availableSegmentCount == 0) {
-          seenEmptyIndex = true;
-          availableStartTimeUs = 0;
-          availableEndTimeUs = 0;
-        } else if (!seenEmptyIndex) {
-          long firstAvailableSegmentNum =
-              index.getFirstAvailableSegmentNum(periodDurationUs, nowUnixTimeUs);
-          long adaptationSetAvailableStartTimeUs = index.getTimeUs(firstAvailableSegmentNum);
-          availableStartTimeUs = max(availableStartTimeUs, adaptationSetAvailableStartTimeUs);
-          long lastAvailableSegmentNum = firstAvailableSegmentNum + availableSegmentCount - 1;
-          long adaptationSetAvailableEndTimeUs =
-              index.getTimeUs(lastAvailableSegmentNum)
-                  + index.getDurationUs(lastAvailableSegmentNum, periodDurationUs);
-          availableEndTimeUs = min(availableEndTimeUs, adaptationSetAvailableEndTimeUs);
-        }
       }
-      return new PeriodSeekInfo(isIndexExplicit, availableStartTimeUs, availableEndTimeUs);
+      int availableSegmentCount = index.getAvailableSegmentCount(periodDurationUs, nowUnixTimeUs);
+      if (availableSegmentCount == 0) {
+        return 0;
+      }
+      long firstAvailableSegmentNum =
+          index.getFirstAvailableSegmentNum(periodDurationUs, nowUnixTimeUs);
+      long adaptationSetAvailableStartTimeUs = index.getTimeUs(firstAvailableSegmentNum);
+      availableStartTimeUs = max(availableStartTimeUs, adaptationSetAvailableStartTimeUs);
     }
+    return availableStartTimeUs;
+  }
 
-    public final boolean isIndexExplicit;
+  private static long getAvailableEndTimeUs(
-    public final long availableStartTimeUs;
+      Period period, long periodDurationUs, long nowUnixTimeUs) {
-    public final long availableEndTimeUs;
+    long availableEndTimeUs = Long.MAX_VALUE;
-
+    boolean haveAudioVideoAdaptationSets = hasVideoOrAudioAdaptationSets(period);
-    private PeriodSeekInfo(boolean isIndexExplicit, long availableStartTimeUs,
+    for (int i = 0; i < period.adaptationSets.size(); i++) {
-        long availableEndTimeUs) {
+      AdaptationSet adaptationSet = period.adaptationSets.get(i);
-      this.isIndexExplicit = isIndexExplicit;
+      List<Representation> representations = adaptationSet.representations;
-      this.availableStartTimeUs = availableStartTimeUs;
+      // Exclude text adaptation sets from duration calculations, if we have at least one audio
-      this.availableEndTimeUs = availableEndTimeUs;
+      // or video adaptation set. See: https://github.com/google/ExoPlayer/issues/4029
+      if ((haveAudioVideoAdaptationSets && adaptationSet.type == C.TRACK_TYPE_TEXT)
+          || representations.isEmpty()) {
+        continue;
+      }
+      @Nullable DashSegmentIndex index = representations.get(0).getIndex();
+      if (index == null) {
+        return periodDurationUs;
+      }
+      int availableSegmentCount = index.getAvailableSegmentCount(periodDurationUs, nowUnixTimeUs);
+      if (availableSegmentCount == 0) {
+        return 0;
+      }
+      long firstAvailableSegmentNum =
+          index.getFirstAvailableSegmentNum(periodDurationUs, nowUnixTimeUs);
+      long lastAvailableSegmentNum = firstAvailableSegmentNum + availableSegmentCount - 1;
+      long adaptationSetAvailableEndTimeUs =
+          index.getTimeUs(lastAvailableSegmentNum)
+              + index.getDurationUs(lastAvailableSegmentNum, periodDurationUs);
+      availableEndTimeUs = min(availableEndTimeUs, adaptationSetAvailableEndTimeUs);
     }
+    return availableEndTimeUs;
+  }
 
+  private static boolean isIndexExplicit(Period period) {
+    for (int i = 0; i < period.adaptationSets.size(); i++) {
+      @Nullable
+      DashSegmentIndex index = period.adaptationSets.get(i).representations.get(0).getIndex();
+      if (index == null || index.isExplicit()) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  private static boolean hasVideoOrAudioAdaptationSets(Period period) {
+    for (int i = 0; i < period.adaptationSets.size(); i++) {
+      int type = period.adaptationSets.get(i).type;
+      if (type == C.TRACK_TYPE_AUDIO || type == C.TRACK_TYPE_VIDEO) {
+        return true;
+      }
+    }
+    return false;
   }
 
   private static final class DashTimeline extends Timeline {