diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/CompositeSequenceableLoader.java b/library/core/src/main/java/com/google/android/exoplayer2/source/CompositeSequenceableLoader.java
index c28a016581..343d4f0bbe 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/CompositeSequenceableLoader.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/CompositeSequenceableLoader.java
@@ -29,7 +29,19 @@ public final class CompositeSequenceableLoader implements SequenceableLoader {
   }
 
   @Override
-  public long getNextLoadPositionUs() {
+  public final long getBufferedPositionUs() {
+    long bufferedPositionUs = Long.MAX_VALUE;
+    for (SequenceableLoader loader : loaders) {
+      long loaderBufferedPositionUs = loader.getBufferedPositionUs();
+      if (loaderBufferedPositionUs != C.TIME_END_OF_SOURCE) {
+        bufferedPositionUs = Math.min(bufferedPositionUs, loaderBufferedPositionUs);
+      }
+    }
+    return bufferedPositionUs == Long.MAX_VALUE ? C.TIME_END_OF_SOURCE : bufferedPositionUs;
+  }
+
+  @Override
+  public final long getNextLoadPositionUs() {
     long nextLoadPositionUs = Long.MAX_VALUE;
     for (SequenceableLoader loader : loaders) {
       long loaderNextLoadPositionUs = loader.getNextLoadPositionUs();
@@ -41,7 +53,7 @@ public final class CompositeSequenceableLoader implements SequenceableLoader {
   }
 
   @Override
-  public boolean continueLoading(long positionUs) {
+  public final boolean continueLoading(long positionUs) {
     boolean madeProgress = false;
     boolean madeProgressThisIteration;
     do {
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/MediaPeriod.java b/library/core/src/main/java/com/google/android/exoplayer2/source/MediaPeriod.java
index 24b7fdc75f..7a43dd7562 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/MediaPeriod.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/MediaPeriod.java
@@ -128,16 +128,6 @@ public interface MediaPeriod extends SequenceableLoader {
    */
   long readDiscontinuity();
 
-  /**
-   * Returns an estimate of the position up to which data is buffered for the enabled tracks.
-   * <p>
-   * This method should only be called when at least one track is selected.
-   *
-   * @return An estimate of the absolute position in microseconds up to which data is buffered, or
-   *     {@link C#TIME_END_OF_SOURCE} if the track is fully buffered.
-   */
-  long getBufferedPositionUs();
-
   /**
    * Attempts to seek to the specified position in microseconds.
    * <p>
@@ -153,6 +143,17 @@ public interface MediaPeriod extends SequenceableLoader {
 
   // SequenceableLoader interface. Overridden to provide more specific documentation.
 
+  /**
+   * Returns an estimate of the position up to which data is buffered for the enabled tracks.
+   * <p>
+   * This method should only be called when at least one track is selected.
+   *
+   * @return An estimate of the absolute position in microseconds up to which data is buffered, or
+   *     {@link C#TIME_END_OF_SOURCE} if the track is fully buffered.
+   */
+  @Override
+  long getBufferedPositionUs();
+
   /**
    * Returns the next load time, or {@link C#TIME_END_OF_SOURCE} if loading has finished.
    * <p>
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaPeriod.java b/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaPeriod.java
index cfb75b1b87..e6a4d4e603 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaPeriod.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaPeriod.java
@@ -168,14 +168,7 @@ import java.util.IdentityHashMap;
 
   @Override
   public long getBufferedPositionUs() {
-    long bufferedPositionUs = Long.MAX_VALUE;
-    for (MediaPeriod period : enabledPeriods) {
-      long rendererBufferedPositionUs = period.getBufferedPositionUs();
-      if (rendererBufferedPositionUs != C.TIME_END_OF_SOURCE) {
-        bufferedPositionUs = Math.min(bufferedPositionUs, rendererBufferedPositionUs);
-      }
-    }
-    return bufferedPositionUs == Long.MAX_VALUE ? C.TIME_END_OF_SOURCE : bufferedPositionUs;
+    return sequenceableLoader.getBufferedPositionUs();
   }
 
   @Override
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/SequenceableLoader.java b/library/core/src/main/java/com/google/android/exoplayer2/source/SequenceableLoader.java
index f287153719..26cb9a2666 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/SequenceableLoader.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/SequenceableLoader.java
@@ -36,6 +36,14 @@ public interface SequenceableLoader {
 
   }
 
+  /**
+   * Returns an estimate of the position up to which data is buffered.
+   *
+   * @return An estimate of the absolute position in microseconds up to which data is buffered, or
+   *     {@link C#TIME_END_OF_SOURCE} if the data is fully buffered.
+   */
+  long getBufferedPositionUs();
+
   /**
    * Returns the next load time, or {@link C#TIME_END_OF_SOURCE} if loading has finished.
    */
diff --git a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaPeriod.java b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaPeriod.java
index b74dcc4f5c..81b4a4ceed 100644
--- a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaPeriod.java
+++ b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaPeriod.java
@@ -209,14 +209,7 @@ import java.util.List;
 
   @Override
   public long getBufferedPositionUs() {
-    long bufferedPositionUs = Long.MAX_VALUE;
-    for (ChunkSampleStream<DashChunkSource> sampleStream : sampleStreams) {
-      long rendererBufferedPositionUs = sampleStream.getBufferedPositionUs();
-      if (rendererBufferedPositionUs != C.TIME_END_OF_SOURCE) {
-        bufferedPositionUs = Math.min(bufferedPositionUs, rendererBufferedPositionUs);
-      }
-    }
-    return bufferedPositionUs == Long.MAX_VALUE ? C.TIME_END_OF_SOURCE : bufferedPositionUs;
+    return sequenceableLoader.getBufferedPositionUs();
   }
 
   @Override
diff --git a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaPeriod.java b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaPeriod.java
index 32f5bc3d99..003b38efef 100644
--- a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaPeriod.java
+++ b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaPeriod.java
@@ -203,14 +203,7 @@ public final class HlsMediaPeriod implements MediaPeriod, HlsSampleStreamWrapper
 
   @Override
   public long getBufferedPositionUs() {
-    long bufferedPositionUs = Long.MAX_VALUE;
-    for (HlsSampleStreamWrapper sampleStreamWrapper : enabledSampleStreamWrappers) {
-      long rendererBufferedPositionUs = sampleStreamWrapper.getBufferedPositionUs();
-      if (rendererBufferedPositionUs != C.TIME_END_OF_SOURCE) {
-        bufferedPositionUs = Math.min(bufferedPositionUs, rendererBufferedPositionUs);
-      }
-    }
-    return bufferedPositionUs == Long.MAX_VALUE ? C.TIME_END_OF_SOURCE : bufferedPositionUs;
+    return sequenceableLoader.getBufferedPositionUs();
   }
 
   @Override
diff --git a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java
index a52c56aafd..1cc2a6833d 100644
--- a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java
+++ b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java
@@ -159,14 +159,7 @@ import java.util.ArrayList;
 
   @Override
   public long getBufferedPositionUs() {
-    long bufferedPositionUs = Long.MAX_VALUE;
-    for (ChunkSampleStream<SsChunkSource> sampleStream : sampleStreams) {
-      long rendererBufferedPositionUs = sampleStream.getBufferedPositionUs();
-      if (rendererBufferedPositionUs != C.TIME_END_OF_SOURCE) {
-        bufferedPositionUs = Math.min(bufferedPositionUs, rendererBufferedPositionUs);
-      }
-    }
-    return bufferedPositionUs == Long.MAX_VALUE ? C.TIME_END_OF_SOURCE : bufferedPositionUs;
+    return sequenceableLoader.getBufferedPositionUs();
   }
 
   @Override