Move audio buffer/array test utility methods to TestUtil.

PiperOrigin-RevId: 504611069

library/transformer/src/test/java/com/google/android/exoplayer2/transformer/AudioMixerImplTest.java

@@ -15,14 +15,14 @@
  */
 package com.google.android.exoplayer2.transformer;
 
+import static com.google.android.exoplayer2.testutil.TestUtil.createByteBuffer;
+import static com.google.android.exoplayer2.testutil.TestUtil.createFloatArray;
 import static com.google.common.truth.Truth.assertThat;
 
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.audio.AudioProcessor.AudioFormat;
 import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.FloatBuffer;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -318,25 +318,4 @@ public final class AudioMixerImplTest {
 
     assertThat(mixer.getOutput().remaining()).isEqualTo(0);
   }
-
-  private static ByteBuffer createByteBuffer(float[] content) {
-    ByteBuffer buffer =
-        ByteBuffer.allocateDirect(content.length * 4).order(ByteOrder.nativeOrder());
-    buffer.asFloatBuffer().put(content);
-    return buffer;
-  }
-
-  private static ByteBuffer createByteBuffer(short[] content) {
-    ByteBuffer byteBuffer =
-        ByteBuffer.allocateDirect(content.length * 2).order(ByteOrder.nativeOrder());
-    byteBuffer.asShortBuffer().put(content);
-    return byteBuffer;
-  }
-
-  private static float[] createFloatArray(ByteBuffer byteBuffer) {
-    FloatBuffer buffer = byteBuffer.asFloatBuffer();
-    float[] content = new float[buffer.remaining()];
-    buffer.get(content);
-    return content;
-  }
 }

library/transformer/src/test/java/com/google/android/exoplayer2/transformer/FloatAudioMixingAlgorithmTest.java

@@ -15,14 +15,14 @@
  */
 package com.google.android.exoplayer2.transformer;
 
+import static com.google.android.exoplayer2.testutil.TestUtil.createByteBuffer;
+import static com.google.android.exoplayer2.testutil.TestUtil.createFloatArray;
 import static com.google.common.truth.Truth.assertThat;
 
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.audio.AudioProcessor.AudioFormat;
 import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.FloatBuffer;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -201,25 +201,4 @@ public final class FloatAudioMixingAlgorithmTest {
                     /* sampleRate= */ 44100, /* channelCount= */ 2, C.ENCODING_PCM_32BIT)))
         .isFalse();
   }
-
-  private static ByteBuffer createByteBuffer(float[] content) {
-    ByteBuffer byteBuffer =
-        ByteBuffer.allocateDirect(content.length * 4).order(ByteOrder.nativeOrder());
-    byteBuffer.asFloatBuffer().put(content);
-    return byteBuffer;
-  }
-
-  private static ByteBuffer createByteBuffer(short[] content) {
-    ByteBuffer byteBuffer =
-        ByteBuffer.allocateDirect(content.length * 2).order(ByteOrder.nativeOrder());
-    byteBuffer.asShortBuffer().put(content);
-    return byteBuffer;
-  }
-
-  private static float[] createFloatArray(ByteBuffer byteBuffer) {
-    FloatBuffer buffer = byteBuffer.asFloatBuffer();
-    float[] content = new float[buffer.remaining()];
-    buffer.get(content);
-    return content;
-  }
 }

testutils/src/main/java/com/google/android/exoplayer2/testutil/TestUtil.java

@@ -51,6 +51,8 @@ import java.io.InputStream;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -121,12 +123,35 @@ public class TestUtil {
    * @return The equivalent byte array.
    */
   public static byte[] createByteArray(int... bytes) {
-    byte[] byteArray = new byte[bytes.length];
-    for (int i = 0; i < byteArray.length; i++) {
+    byte[] array = new byte[bytes.length];
+    for (int i = 0; i < array.length; i++) {
       Assertions.checkState(0x00 <= bytes[i] && bytes[i] <= 0xFF);
-      byteArray[i] = (byte) bytes[i];
+      array[i] = (byte) bytes[i];
     }
-    return byteArray;
+    return array;
+  }
+
+  /** Gets the underlying data of the {@link ByteBuffer} as a {@code float[]}. */
+  public static float[] createFloatArray(ByteBuffer byteBuffer) {
+    FloatBuffer buffer = byteBuffer.asFloatBuffer();
+    float[] content = new float[buffer.remaining()];
+    buffer.get(content);
+    return content;
+  }
+
+  /** Creates a {@link ByteBuffer} containing the {@code data}. */
+  public static ByteBuffer createByteBuffer(float[] data) {
+    ByteBuffer buffer =
+        ByteBuffer.allocateDirect(data.length * C.BYTES_PER_FLOAT).order(ByteOrder.nativeOrder());
+    buffer.asFloatBuffer().put(data);
+    return buffer;
+  }
+
+  /** Creates a {@link ByteBuffer} containing the {@code data}. */
+  public static ByteBuffer createByteBuffer(short[] data) {
+    ByteBuffer buffer = ByteBuffer.allocateDirect(data.length * 2).order(ByteOrder.nativeOrder());
+    buffer.asShortBuffer().put(data);
+    return buffer;
   }
 
   /**