Make ChunkExtractor return a ChunkIndex instead of a SeekMap

PiperOrigin-RevId: 315283645

library/core/src/main/java/com/google/android/exoplayer2/source/chunk/BundledChunkExtractor.java

@@ -21,6 +21,7 @@ import android.util.SparseArray;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.extractor.ChunkIndex;
 import com.google.android.exoplayer2.extractor.DummyTrackOutput;
 import com.google.android.exoplayer2.extractor.Extractor;
 import com.google.android.exoplayer2.extractor.ExtractorInput;
@@ -74,8 +75,8 @@ public final class BundledChunkExtractor implements ExtractorOutput, ChunkExtrac
 
   @Override
   @Nullable
-  public SeekMap getSeekMap() {
-    return seekMap;
+  public ChunkIndex getChunkIndex() {
+    return seekMap instanceof ChunkIndex ? (ChunkIndex) seekMap : null;
   }
 
   @Override

library/core/src/main/java/com/google/android/exoplayer2/source/chunk/ChunkExtractor.java

@@ -18,9 +18,9 @@ package com.google.android.exoplayer2.source.chunk;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.extractor.ChunkIndex;
 import com.google.android.exoplayer2.extractor.Extractor;
 import com.google.android.exoplayer2.extractor.ExtractorInput;
-import com.google.android.exoplayer2.extractor.SeekMap;
 import com.google.android.exoplayer2.extractor.TrackOutput;
 import java.io.IOException;
 
@@ -50,11 +50,11 @@ public interface ChunkExtractor {
   }
 
   /**
-   * Returns the {@link SeekMap} most recently output by the extractor, or null if the extractor has
-   * not output a {@link SeekMap}.
+   * Returns the {@link ChunkIndex} most recently obtained from the chunks, or null if a {@link
+   * ChunkIndex} has not been obtained.
    */
   @Nullable
-  SeekMap getSeekMap();
+  ChunkIndex getChunkIndex();
 
   /**
    * Returns the sample {@link Format}s for the tracks identified by the extractor, or null if the

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

@@ -136,9 +136,10 @@ public final class DashUtil {
   @Nullable
   public static ChunkIndex loadChunkIndex(
       DataSource dataSource, int trackType, Representation representation) throws IOException {
+    @Nullable
     ChunkExtractor chunkExtractor =
         loadInitializationData(dataSource, trackType, representation, true);
-    return chunkExtractor == null ? null : (ChunkIndex) chunkExtractor.getSeekMap();
+    return chunkExtractor == null ? null : chunkExtractor.getChunkIndex();
   }
 
   /**

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

@@ -24,7 +24,6 @@ import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.SeekParameters;
 import com.google.android.exoplayer2.extractor.ChunkIndex;
 import com.google.android.exoplayer2.extractor.Extractor;
-import com.google.android.exoplayer2.extractor.SeekMap;
 import com.google.android.exoplayer2.extractor.TrackOutput;
 import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer2.extractor.mp4.FragmentedMp4Extractor;
@@ -400,13 +399,12 @@ public class DefaultDashChunkSource implements DashChunkSource {
       // from the stream. If the manifest defines an index then the stream shouldn't, but in cases
       // where it does we should ignore it.
       if (representationHolder.segmentIndex == null) {
-        SeekMap seekMap = representationHolder.chunkExtractor.getSeekMap();
-        if (seekMap != null) {
+        @Nullable ChunkIndex chunkIndex = representationHolder.chunkExtractor.getChunkIndex();
+        if (chunkIndex != null) {
           representationHolders[trackIndex] =
               representationHolder.copyWithNewSegmentIndex(
                   new DashWrappingSegmentIndex(
-                      (ChunkIndex) seekMap,
-                      representationHolder.representation.presentationTimeOffsetUs));
+                      chunkIndex, representationHolder.representation.presentationTimeOffsetUs));
         }
       }
     }