Fix DefaultAudioTrackBufferSizeProvider test

And move them in separate top level classes so that presubmit runs them.

#minor-release

PiperOrigin-RevId: 427482430

library/core/src/test/java/com/google/android/exoplayer2/audio/DefaultAudioTrackBufferSizeProviderAC3Test.java

+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.exoplayer2.audio;
+
+import static com.google.android.exoplayer2.C.MICROS_PER_SECOND;
+import static com.google.android.exoplayer2.audio.DefaultAudioSink.OUTPUT_MODE_PASSTHROUGH;
+import static com.google.android.exoplayer2.audio.DefaultAudioTrackBufferSizeProvider.getMaximumEncodedRateBytesPerSecond;
+import static com.google.common.truth.Truth.assertThat;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import com.google.android.exoplayer2.C;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/** Tests for {@link DefaultAudioTrackBufferSizeProvider} AC3 audio. */
+@RunWith(AndroidJUnit4.class)
+public class DefaultAudioTrackBufferSizeProviderAC3Test {
+
+  private static final DefaultAudioTrackBufferSizeProvider DEFAULT =
+      new DefaultAudioTrackBufferSizeProvider.Builder().build();
+
+  @Test
+  public void
+      getBufferSizeInBytes_passthroughAC3_isPassthroughBufferSizeTimesMultiplicationFactor() {
+    int bufferSize =
+        DEFAULT.getBufferSizeInBytes(
+            /* minBufferSizeInBytes= */ 0,
+            /* encoding= */ C.ENCODING_AC3,
+            /* outputMode= */ OUTPUT_MODE_PASSTHROUGH,
+            /* pcmFrameSize= */ 1,
+            /* sampleRate= */ 0,
+            /* maxAudioTrackPlaybackSpeed= */ 1);
+
+    assertThat(bufferSize)
+        .isEqualTo(
+            durationUsToAc3MaxBytes(DEFAULT.passthroughBufferDurationUs)
+                * DEFAULT.ac3BufferMultiplicationFactor);
+  }
+
+  private static int durationUsToAc3MaxBytes(long durationUs) {
+    return (int)
+        (durationUs * getMaximumEncodedRateBytesPerSecond(C.ENCODING_AC3) / MICROS_PER_SECOND);
+  }
+}

library/core/src/test/java/com/google/android/exoplayer2/audio/DefaultAudioTrackBufferSizeProviderEncodedTest.java

+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.exoplayer2.audio;
+
+import static com.google.android.exoplayer2.audio.DefaultAudioSink.OUTPUT_MODE_PASSTHROUGH;
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.android.exoplayer2.C;
+import com.google.common.collect.ImmutableList;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.ParameterizedRobolectricTestRunner;
+
+/**
+ * Tests for {@link DefaultAudioTrackBufferSizeProvider} for encoded audio except {@link
+ * C#ENCODING_AC3}.
+ */
+@RunWith(ParameterizedRobolectricTestRunner.class)
+public class DefaultAudioTrackBufferSizeProviderEncodedTest {
+
+  private static final DefaultAudioTrackBufferSizeProvider DEFAULT =
+      new DefaultAudioTrackBufferSizeProvider.Builder().build();
+
+  @ParameterizedRobolectricTestRunner.Parameter(0)
+  public @C.Encoding int encoding;
+
+  @ParameterizedRobolectricTestRunner.Parameters(name = "{index}: encoding={0}")
+  public static ImmutableList<Integer> data() {
+    return ImmutableList.of(
+        C.ENCODING_MP3,
+        C.ENCODING_AAC_LC,
+        C.ENCODING_AAC_HE_V1,
+        C.ENCODING_AC4,
+        C.ENCODING_DTS,
+        C.ENCODING_DOLBY_TRUEHD);
+  }
+
+  @Test
+  public void getBufferSizeInBytes_veryBigMinBufferSize_isMinBufferSize() {
+    int bufferSize =
+        DEFAULT.getBufferSizeInBytes(
+            /* minBufferSizeInBytes= */ 123456789,
+            /* encoding= */ encoding,
+            /* outputMode= */ OUTPUT_MODE_PASSTHROUGH,
+            /* pcmFrameSize= */ 1,
+            /* sampleRate= */ 0,
+            /* maxAudioTrackPlaybackSpeed= */ 0);
+
+    assertThat(bufferSize).isEqualTo(123456789);
+  }
+}