diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/DefaultMediaSourceFactory.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/DefaultMediaSourceFactory.java
index 291fbbe340..64f849448d 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/DefaultMediaSourceFactory.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/DefaultMediaSourceFactory.java
@@ -412,7 +412,7 @@ public final class DefaultMediaSourceFactory implements MediaSourceFactory {
 
   @UnstableApi
   @Override
-  public int[] getSupportedTypes() {
+  public @C.ContentType int[] getSupportedTypes() {
     return delegateFactoryLoader.getSupportedTypes();
   }
 
diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/ProgressiveMediaSource.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/ProgressiveMediaSource.java
index aef2e708a9..a97818f146 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/ProgressiveMediaSource.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/ProgressiveMediaSource.java
@@ -227,7 +227,7 @@ public final class ProgressiveMediaSource extends BaseMediaSource
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_OTHER};
     }
   }
diff --git a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DashMediaSource.java b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DashMediaSource.java
index c7706612b4..d9603d742f 100644
--- a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DashMediaSource.java
+++ b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DashMediaSource.java
@@ -313,7 +313,7 @@ public final class DashMediaSource extends BaseMediaSource {
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_DASH};
     }
   }
diff --git a/libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsMediaSource.java b/libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsMediaSource.java
index 26c34e64a5..256cda9c79 100644
--- a/libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsMediaSource.java
+++ b/libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsMediaSource.java
@@ -361,7 +361,7 @@ public final class HlsMediaSource extends BaseMediaSource
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_HLS};
     }
   }
diff --git a/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java b/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java
index 822c8cf872..e5467d7a54 100644
--- a/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java
+++ b/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java
@@ -154,7 +154,7 @@ public final class ImaServerSideAdInsertionMediaSource extends CompositeMediaSou
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return contentMediaSourceFactory.getSupportedTypes();
     }
 
diff --git a/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaSource.java b/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaSource.java
index f0e5877a12..f2f6b52e61 100644
--- a/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaSource.java
+++ b/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaSource.java
@@ -166,7 +166,7 @@ public final class RtspMediaSource extends BaseMediaSource {
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_RTSP};
     }
 
diff --git a/libraries/exoplayer_smoothstreaming/src/main/java/androidx/media3/exoplayer/smoothstreaming/SsMediaSource.java b/libraries/exoplayer_smoothstreaming/src/main/java/androidx/media3/exoplayer/smoothstreaming/SsMediaSource.java
index 1186cfc350..b92deea4ac 100644
--- a/libraries/exoplayer_smoothstreaming/src/main/java/androidx/media3/exoplayer/smoothstreaming/SsMediaSource.java
+++ b/libraries/exoplayer_smoothstreaming/src/main/java/androidx/media3/exoplayer/smoothstreaming/SsMediaSource.java
@@ -292,7 +292,7 @@ public final class SsMediaSource extends BaseMediaSource
     }
 
     @Override
-    public int[] getSupportedTypes() {
+    public @C.ContentType int[] getSupportedTypes() {
       return new int[] {C.CONTENT_TYPE_SS};
     }
   }
diff --git a/libraries/test_utils/src/main/java/androidx/media3/test/utils/FakeMediaSourceFactory.java b/libraries/test_utils/src/main/java/androidx/media3/test/utils/FakeMediaSourceFactory.java
index bd92f38471..307ec5bbe9 100644
--- a/libraries/test_utils/src/main/java/androidx/media3/test/utils/FakeMediaSourceFactory.java
+++ b/libraries/test_utils/src/main/java/androidx/media3/test/utils/FakeMediaSourceFactory.java
@@ -49,7 +49,7 @@ public final class FakeMediaSourceFactory implements MediaSourceFactory {
   }
 
   @Override
-  public int[] getSupportedTypes() {
+  public @C.ContentType int[] getSupportedTypes() {
     return new int[] {C.CONTENT_TYPE_OTHER};
   }