Fix audio slow motion flattening

PiperOrigin-RevId: 488981968

libraries/common/src/main/java/androidx/media3/common/audio/AudioProcessingPipeline.java

@@ -15,7 +15,6 @@
  */
  */
 package androidx.media3.common.audio;
 package androidx.media3.common.audio;
 
 
-import static androidx.media3.common.audio.AudioProcessor.EMPTY_BUFFER;
 import static androidx.media3.common.util.Assertions.checkState;
 import static androidx.media3.common.util.Assertions.checkState;
 
 
 import androidx.annotation.Nullable;
 import androidx.annotation.Nullable;
@@ -24,6 +23,7 @@ import androidx.media3.common.util.UnstableApi;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableList;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import java.nio.ByteBuffer;
 import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
 import java.util.ArrayList;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.List;
 
 
@@ -68,6 +68,11 @@ import java.util.List;
  */
  */
 @UnstableApi
 @UnstableApi
 public final class AudioProcessingPipeline {
 public final class AudioProcessingPipeline {
+
+  /** An empty, direct {@link ByteBuffer}. */
+  private static final ByteBuffer EMPTY_BUFFER =
+      ByteBuffer.allocateDirect(0).order(ByteOrder.nativeOrder());
+
   /** The {@link AudioProcessor} instances passed to {@link AudioProcessingPipeline}. */
   /** The {@link AudioProcessor} instances passed to {@link AudioProcessingPipeline}. */
   private final ImmutableList<AudioProcessor> audioProcessors;
   private final ImmutableList<AudioProcessor> audioProcessors;
   /**
   /**