diff --git a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java
index 34301742e5..b6663ac3d7 100644
--- a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java
+++ b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java
@@ -137,7 +137,7 @@ public class LibvpxVideoRenderer extends BaseRenderer {
   private long joiningDeadlineMs;
   private Surface surface;
   private VpxOutputBufferRenderer outputBufferRenderer;
-  private int outputMode;
+  @C.VideoOutputMode private int outputMode;
   private boolean waitingForKeys;
 
   private boolean inputStreamEnded;
@@ -275,7 +275,7 @@ public class LibvpxVideoRenderer extends BaseRenderer {
     formatQueue = new TimedValueQueue<>();
     flagsOnlyBuffer = DecoderInputBuffer.newFlagsOnlyInstance();
     eventDispatcher = new EventDispatcher(eventHandler, eventListener);
-    outputMode = VpxDecoder.OUTPUT_MODE_NONE;
+    outputMode = C.VIDEO_OUTPUT_MODE_NONE;
     decoderReinitializationState = REINITIALIZATION_STATE_NONE;
   }
 
@@ -349,8 +349,9 @@ public class LibvpxVideoRenderer extends BaseRenderer {
     if (waitingForKeys) {
       return false;
     }
-    if (format != null && (isSourceReady() || outputBuffer != null)
-        && (renderedFirstFrame || outputMode == VpxDecoder.OUTPUT_MODE_NONE)) {
+    if (format != null
+        && (isSourceReady() || outputBuffer != null)
+        && (renderedFirstFrame || outputMode == C.VIDEO_OUTPUT_MODE_NONE)) {
       // Ready. If we were joining then we've now joined, so clear the joining deadline.
       joiningDeadlineMs = C.TIME_UNSET;
       return true;
@@ -628,8 +629,8 @@ public class LibvpxVideoRenderer extends BaseRenderer {
    */
   protected void renderOutputBuffer(VpxOutputBuffer outputBuffer) throws VpxDecoderException {
     int bufferMode = outputBuffer.mode;
-    boolean renderSurface = bufferMode == VpxDecoder.OUTPUT_MODE_SURFACE_YUV && surface != null;
-    boolean renderYuv = bufferMode == VpxDecoder.OUTPUT_MODE_YUV && outputBufferRenderer != null;
+    boolean renderSurface = bufferMode == C.VIDEO_OUTPUT_MODE_SURFACE_YUV && surface != null;
+    boolean renderYuv = bufferMode == C.VIDEO_OUTPUT_MODE_YUV && outputBufferRenderer != null;
     lastRenderTimeUs = SystemClock.elapsedRealtime() * 1000;
     if (!renderYuv && !renderSurface) {
       dropOutputBuffer(outputBuffer);
@@ -713,12 +714,12 @@ public class LibvpxVideoRenderer extends BaseRenderer {
       this.surface = surface;
       this.outputBufferRenderer = outputBufferRenderer;
       if (surface != null) {
-        outputMode = VpxDecoder.OUTPUT_MODE_SURFACE_YUV;
+        outputMode = C.VIDEO_OUTPUT_MODE_SURFACE_YUV;
       } else {
         outputMode =
-            outputBufferRenderer != null ? VpxDecoder.OUTPUT_MODE_YUV : VpxDecoder.OUTPUT_MODE_NONE;
+            outputBufferRenderer != null ? C.VIDEO_OUTPUT_MODE_YUV : C.VIDEO_OUTPUT_MODE_NONE;
       }
-      if (outputMode != VpxDecoder.OUTPUT_MODE_NONE) {
+      if (outputMode != C.VIDEO_OUTPUT_MODE_NONE) {
         if (decoder != null) {
           decoder.setOutputMode(outputMode);
         }
@@ -735,7 +736,7 @@ public class LibvpxVideoRenderer extends BaseRenderer {
         clearReportedVideoSize();
         clearRenderedFirstFrame();
       }
-    } else if (outputMode != VpxDecoder.OUTPUT_MODE_NONE) {
+    } else if (outputMode != C.VIDEO_OUTPUT_MODE_NONE) {
       // The output is unchanged and non-null. If we know the video size and/or have already
       // rendered to the output, report these again immediately.
       maybeRenotifyVideoSizeChanged();
@@ -915,7 +916,7 @@ public class LibvpxVideoRenderer extends BaseRenderer {
     }
 
     long earlyUs = outputBuffer.timeUs - positionUs;
-    if (outputMode == VpxDecoder.OUTPUT_MODE_NONE) {
+    if (outputMode == C.VIDEO_OUTPUT_MODE_NONE) {
       // Skip frames in sync with playback, so we'll be at the right frame if the mode changes.
       if (isBufferLate(earlyUs)) {
         skipOutputBuffer(outputBuffer);
diff --git a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxDecoder.java b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxDecoder.java
index 544259ffc0..93a4a2fc1f 100644
--- a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxDecoder.java
+++ b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxDecoder.java
@@ -29,10 +29,6 @@ import java.nio.ByteBuffer;
 /* package */ final class VpxDecoder
     extends SimpleDecoder<VideoDecoderInputBuffer, VpxOutputBuffer, VpxDecoderException> {
 
-  public static final int OUTPUT_MODE_NONE = -1;
-  public static final int OUTPUT_MODE_YUV = 0;
-  public static final int OUTPUT_MODE_SURFACE_YUV = 1;
-
   private static final int NO_ERROR = 0;
   private static final int DECODE_ERROR = 1;
   private static final int DRM_ERROR = 2;
@@ -40,7 +36,7 @@ import java.nio.ByteBuffer;
   private final ExoMediaCrypto exoMediaCrypto;
   private final long vpxDecContext;
 
-  private volatile int outputMode;
+  @C.VideoOutputMode private volatile int outputMode;
 
   /**
    * Creates a VP9 decoder.
@@ -87,10 +83,9 @@ import java.nio.ByteBuffer;
   /**
    * Sets the output mode for frames rendered by the decoder.
    *
-   * @param outputMode The output mode. One of {@link #OUTPUT_MODE_NONE} and {@link
-   *     #OUTPUT_MODE_YUV}.
+   * @param outputMode The output mode.
    */
-  public void setOutputMode(int outputMode) {
+  public void setOutputMode(@C.VideoOutputMode int outputMode) {
     this.outputMode = outputMode;
   }
 
@@ -108,7 +103,7 @@ import java.nio.ByteBuffer;
   protected void releaseOutputBuffer(VpxOutputBuffer buffer) {
     // Decode only frames do not acquire a reference on the internal decoder buffer and thus do not
     // require a call to vpxReleaseFrame.
-    if (outputMode == OUTPUT_MODE_SURFACE_YUV && !buffer.isDecodeOnly()) {
+    if (outputMode == C.VIDEO_OUTPUT_MODE_SURFACE_YUV && !buffer.isDecodeOnly()) {
       vpxReleaseFrame(vpxDecContext, buffer);
     }
     super.releaseOutputBuffer(buffer);
diff --git a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxOutputBuffer.java b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxOutputBuffer.java
index 30d7b8e92c..de411089ab 100644
--- a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxOutputBuffer.java
+++ b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/VpxOutputBuffer.java
@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.ext.vp9;
 
+import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.decoder.OutputBuffer;
 import com.google.android.exoplayer2.video.ColorInfo;
 import java.nio.ByteBuffer;
@@ -31,7 +32,8 @@ public final class VpxOutputBuffer extends OutputBuffer {
   /** Decoder private data. */
   public int decoderPrivate;
 
-  public int mode;
+  /** Output mode. */
+  @C.VideoOutputMode public int mode;
   /**
    * RGB buffer for RGB mode.
    */
@@ -60,10 +62,10 @@ public final class VpxOutputBuffer extends OutputBuffer {
    * Initializes the buffer.
    *
    * @param timeUs The presentation timestamp for the buffer, in microseconds.
-   * @param mode The output mode. One of {@link VpxDecoder#OUTPUT_MODE_NONE}, {@link
-   *     VpxDecoder#OUTPUT_MODE_YUV} and {@link VpxDecoder#OUTPUT_MODE_SURFACE_YUV}.
+   * @param mode The output mode. One of {@link C#VIDEO_OUTPUT_MODE_NONE}, {@link
+   *     C#VIDEO_OUTPUT_MODE_YUV} and {@link C#VIDEO_OUTPUT_MODE_SURFACE_YUV}.
    */
-  public void init(long timeUs, int mode) {
+  public void init(long timeUs, @C.VideoOutputMode int mode) {
     this.timeUs = timeUs;
     this.mode = mode;
   }
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/C.java b/library/core/src/main/java/com/google/android/exoplayer2/C.java
index 8ded5038b0..9ed5cb7e36 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/C.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/C.java
@@ -499,6 +499,21 @@ public final class C {
   /** Indicates that a buffer should be decoded but not rendered. */
   public static final int BUFFER_FLAG_DECODE_ONLY = 1 << 31; // 0x80000000
 
+  /**
+   * Video decoder output modes. Possible modes are {@link #VIDEO_OUTPUT_MODE_NONE}, {@link
+   * #VIDEO_OUTPUT_MODE_YUV} and {@link #VIDEO_OUTPUT_MODE_SURFACE_YUV}.
+   */
+  @Documented
+  @Retention(RetentionPolicy.SOURCE)
+  @IntDef(value = {VIDEO_OUTPUT_MODE_NONE, VIDEO_OUTPUT_MODE_YUV, VIDEO_OUTPUT_MODE_SURFACE_YUV})
+  public @interface VideoOutputMode {}
+  /** Video decoder output mode is not set. */
+  public static final int VIDEO_OUTPUT_MODE_NONE = -1;
+  /** Video decoder output mode that outputs raw 4:2:0 YUV planes. */
+  public static final int VIDEO_OUTPUT_MODE_YUV = 0;
+  /** Video decoder output mode that renders 4:2:0 YUV planes directly to a surface. */
+  public static final int VIDEO_OUTPUT_MODE_SURFACE_YUV = 1;
+
   /**
    * Video scaling modes for {@link MediaCodec}-based {@link Renderer}s. One of {@link
    * #VIDEO_SCALING_MODE_SCALE_TO_FIT} or {@link #VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING}.