diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ClippingMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ClippingMediaSource.java
index e8d20c1c61..9ff704e75a 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ClippingMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ClippingMediaSource.java
@@ -133,7 +133,6 @@ public final class ClippingMediaSource extends CompositeMediaSource<Void> {
   @Override
   public void prepareSource(ExoPlayer player, boolean isTopLevelSource, Listener listener) {
     super.prepareSource(player, isTopLevelSource, listener);
-    Assertions.checkState(sourceListener == null, MEDIA_SOURCE_REUSED_ERROR_MESSAGE);
     sourceListener = listener;
     prepareChildSource(/* id= */ null, mediaSource);
   }
@@ -161,6 +160,13 @@ public final class ClippingMediaSource extends CompositeMediaSource<Void> {
     mediaSource.releasePeriod(((ClippingMediaPeriod) mediaPeriod).mediaPeriod);
   }
 
+  @Override
+  public void releaseSource() {
+    super.releaseSource();
+    clippingError = null;
+    sourceListener = null;
+  }
+
   @Override
   protected void onChildSourceInfoRefreshed(
       Void id, MediaSource mediaSource, Timeline timeline, @Nullable Object manifest) {
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ConcatenatingMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ConcatenatingMediaSource.java
index 4cf0156aad..48de7de364 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ConcatenatingMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ConcatenatingMediaSource.java
@@ -88,7 +88,6 @@ public final class ConcatenatingMediaSource extends CompositeMediaSource<Integer
   @Override
   public void prepareSource(ExoPlayer player, boolean isTopLevelSource, Listener listener) {
     super.prepareSource(player, isTopLevelSource, listener);
-    Assertions.checkState(this.listener == null, MEDIA_SOURCE_REUSED_ERROR_MESSAGE);
     this.listener = listener;
     boolean[] duplicateFlags = buildDuplicateFlags(mediaSources);
     if (mediaSources.length == 0) {
@@ -119,6 +118,13 @@ public final class ConcatenatingMediaSource extends CompositeMediaSource<Integer
     mediaSources[sourceIndex].releasePeriod(mediaPeriod);
   }
 
+  @Override
+  public void releaseSource() {
+    super.releaseSource();
+    listener = null;
+    timeline = null;
+  }
+
   @Override
   protected void onChildSourceInfoRefreshed(
       Integer sourceFirstIndex,
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/LoopingMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/LoopingMediaSource.java
index f92814cadc..5eea1aa1cc 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/LoopingMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/LoopingMediaSource.java
@@ -63,7 +63,6 @@ public final class LoopingMediaSource extends CompositeMediaSource<Void> {
   @Override
   public void prepareSource(ExoPlayer player, boolean isTopLevelSource, final Listener listener) {
     super.prepareSource(player, isTopLevelSource, listener);
-    Assertions.checkState(this.listener == null, MEDIA_SOURCE_REUSED_ERROR_MESSAGE);
     this.listener = listener;
     prepareChildSource(/* id= */ null, childSource);
   }
@@ -81,6 +80,13 @@ public final class LoopingMediaSource extends CompositeMediaSource<Void> {
     childSource.releasePeriod(mediaPeriod);
   }
 
+  @Override
+  public void releaseSource() {
+    super.releaseSource();
+    listener = null;
+    childPeriodCount = 0;
+  }
+
   @Override
   protected void onChildSourceInfoRefreshed(
       Void id, MediaSource mediaSource, Timeline timeline, @Nullable Object manifest) {
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaSource.java
index 64fe35eb22..a738cb1893 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/MergingMediaSource.java
@@ -20,12 +20,12 @@ import android.support.annotation.Nullable;
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.upstream.Allocator;
-import com.google.android.exoplayer2.util.Assertions;
 import java.io.IOException;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 
 /**
  * Merges multiple {@link MediaSource}s.
@@ -100,7 +100,6 @@ public final class MergingMediaSource extends CompositeMediaSource<Integer> {
   @Override
   public void prepareSource(ExoPlayer player, boolean isTopLevelSource, Listener listener) {
     super.prepareSource(player, isTopLevelSource, listener);
-    Assertions.checkState(this.listener == null, MEDIA_SOURCE_REUSED_ERROR_MESSAGE);
     this.listener = listener;
     for (int i = 0; i < mediaSources.length; i++) {
       prepareChildSource(i, mediaSources[i]);
@@ -132,6 +131,18 @@ public final class MergingMediaSource extends CompositeMediaSource<Integer> {
     }
   }
 
+  @Override
+  public void releaseSource() {
+    super.releaseSource();
+    listener = null;
+    primaryTimeline = null;
+    primaryManifest = null;
+    periodCount = PERIOD_COUNT_UNSET;
+    mergeError = null;
+    pendingTimelineSources.clear();
+    Collections.addAll(pendingTimelineSources, mediaSources);
+  }
+
   @Override
   protected void onChildSourceInfoRefreshed(
       Integer id, MediaSource mediaSource, Timeline timeline, @Nullable Object manifest) {