diff --git a/libraries/common/src/main/java/androidx/media3/common/Format.java b/libraries/common/src/main/java/androidx/media3/common/Format.java
index 188a7f25d8..046a86fe51 100644
--- a/libraries/common/src/main/java/androidx/media3/common/Format.java
+++ b/libraries/common/src/main/java/androidx/media3/common/Format.java
@@ -196,6 +196,9 @@ public final class Format {
 
     private @C.CryptoType int cryptoType;
 
+    // Extra custom data added to the class.
+    @Nullable private Object customData;
+
     /** Creates a new instance with default values. */
     public Builder() {
       labels = ImmutableList.of();
@@ -273,6 +276,8 @@ public final class Format {
       this.tileCountVertical = format.tileCountVertical;
       // Provided by the source.
       this.cryptoType = format.cryptoType;
+      // Extra custom data added to the class.
+      this.customData = format.customData;
     }
 
     /**
@@ -729,6 +734,20 @@ public final class Format {
       return this;
     }
 
+    // Extra custom data added to the class.
+
+    /**
+     * Sets the opaque object {@link Format#customData}. The default value is null.
+     *
+     * @param customData The {@link Format#customData}.
+     * @return The builder.
+     */
+    @CanIgnoreReturnValue
+    public Builder setCustomData(@Nullable Object customData) {
+      this.customData = customData;
+      return this;
+    }
+
     // Build.
 
     public Format build() {
@@ -985,6 +1004,12 @@ public final class Format {
    */
   @UnstableApi public final @C.CryptoType int cryptoType;
 
+  /**
+   * An extra opaque object that can be added to the {@link Format} to provide additional information
+   * that can be passed through the player.
+   */
+  @UnstableApi @Nullable public final Object customData;
+
   // Lazily initialized hashcode.
   private int hashCode;
 
@@ -1060,6 +1085,8 @@ public final class Format {
     } else {
       cryptoType = builder.cryptoType;
     }
+    // Extra custom data added to the class.
+    customData = builder.customData;
   }
 
   /** Returns a {@link Format.Builder} initialized with the values of this instance. */
@@ -1234,6 +1261,8 @@ public final class Format {
       result = 31 * result + tileCountVertical;
       // Provided by the source.
       result = 31 * result + cryptoType;
+      // Extra custom data added to the class.
+      result = 31 * result + (customData == null ? 0 : customData.hashCode());
       hashCode = result;
     }
     return hashCode;
@@ -1284,7 +1313,8 @@ public final class Format {
         && Util.areEqual(metadata, other.metadata)
         && Util.areEqual(colorInfo, other.colorInfo)
         && Util.areEqual(drmInitData, other.drmInitData)
-        && initializationDataEquals(other);
+        && initializationDataEquals(other)
+        && Util.areEqual(customData, other.customData);
   }
 
   /**
@@ -1382,6 +1412,9 @@ public final class Format {
       Joiner.on(',').appendTo(builder, Util.getRoleFlagStrings(format.roleFlags));
       builder.append("]");
     }
+    if (format.customData != null) {
+      builder.append(", customData=").append(format.customData);
+    }
     return builder.toString();
   }
 
diff --git a/libraries/common/src/test/java/androidx/media3/common/FormatTest.java b/libraries/common/src/test/java/androidx/media3/common/FormatTest.java
index e95ee68631..a216276b71 100644
--- a/libraries/common/src/test/java/androidx/media3/common/FormatTest.java
+++ b/libraries/common/src/test/java/androidx/media3/common/FormatTest.java
@@ -23,6 +23,7 @@ import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.assertThrows;
 
 import android.os.Bundle;
+import androidx.media3.common.util.Util;
 import androidx.media3.test.utils.FakeMetadataEntry;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.common.collect.ImmutableList;
@@ -35,6 +36,36 @@ import org.junit.runner.RunWith;
 @RunWith(AndroidJUnit4.class)
 public final class FormatTest {
 
+  public static class ExoCustomData {
+    public final String extraMetadata;
+    public final int customInt;
+
+    public ExoCustomData(String extraMetadata, int customInt) {
+      this.extraMetadata = extraMetadata;
+      this.customInt = customInt;
+    }
+
+    @Override
+    public int hashCode() {
+      int result = 17;
+      result = 31 * result + (extraMetadata == null ? 0 : extraMetadata.hashCode());
+      result = 31 * result + customInt;
+      return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (this == obj) {
+        return true;
+      }
+      if (obj == null || getClass() != obj.getClass()) {
+        return false;
+      }
+      ExoCustomData other = (ExoCustomData) obj;
+      return Util.areEqual(extraMetadata, other.extraMetadata) && customInt == other.customInt;
+    }
+  }
+
   @Test
   public void buildUponFormat_createsEqualFormat() {
     Format testFormat = createTestFormat();
@@ -116,7 +147,16 @@ public final class FormatTest {
                 .build());
   }
 
-  private static Format createTestFormat() {
+  @Test
+  public void copyFormat_copiesCustomData() {
+    Format format = createTestFormat().buildUpon().setCustomData(new ExoCustomData("CustomData", 100)).build();
+
+    Format copy = format.buildUpon().build();
+    assertThat(format.customData).isEqualTo(copy.customData);
+    assertThat(format.customData).isEqualTo(new ExoCustomData("CustomData", 100));
+  }
+
+private static Format createTestFormat() {
     byte[] initData1 = new byte[] {1, 2, 3};
     byte[] initData2 = new byte[] {4, 5, 6};
     List<byte[]> initializationData = new ArrayList<>();
diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DecoderAudioRenderer.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DecoderAudioRenderer.java
index 12b4860c13..5a40f90214 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DecoderAudioRenderer.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DecoderAudioRenderer.java
@@ -449,6 +449,7 @@ public abstract class DecoderAudioRenderer<
               .setEncoderDelay(encoderDelay)
               .setEncoderPadding(encoderPadding)
               .setMetadata(inputFormat.metadata)
+              .setCustomData(inputFormat.customData)
               .setId(inputFormat.id)
               .setLabel(inputFormat.label)
               .setLabels(inputFormat.labels)
diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/MediaCodecAudioRenderer.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/MediaCodecAudioRenderer.java
index 24d4cf307b..e3329d2739 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/MediaCodecAudioRenderer.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/MediaCodecAudioRenderer.java
@@ -573,6 +573,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
               .setEncoderDelay(format.encoderDelay)
               .setEncoderPadding(format.encoderPadding)
               .setMetadata(format.metadata)
+              .setCustomData(format.customData)
               .setId(format.id)
               .setLabel(format.label)
               .setLabels(format.labels)