content: /*
   * Copyright (C) 2020 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.mediacodec;
  
  import static com.google.android.exoplayer2.testutil.TestUtil.createByteArray;
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.Format;
  import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
  import com.google.android.exoplayer2.util.MimeTypes;
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.List;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit tests for {@link C2Mp3TimestampTracker}. */
  @RunWith(AndroidJUnit4.class)
  public final class C2Mp3TimestampTrackerTest {
  
    private static final Format FORMAT =
        new Format.Builder()
            .setSampleMimeType(MimeTypes.AUDIO_MPEG)
            .setChannelCount(2)
            .setSampleRate(44_100)
            .build();
  
    private C2Mp3TimestampTracker timestampTracker;
    private DecoderInputBuffer buffer;
    private DecoderInputBuffer invalidBuffer;
  
    @Before
    public void setUp() {
      timestampTracker = new C2Mp3TimestampTracker();
      buffer = new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_DISABLED);
      buffer.data = ByteBuffer.wrap(createByteArray(0xFF, 0xFB, 0xE8, 0x3C));
      buffer.timeUs = 100_000;
      invalidBuffer = new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_DISABLED);
      invalidBuffer.data = ByteBuffer.wrap(createByteArray(0, 0, 0, 0));
      invalidBuffer.timeUs = 120_000;
    }
  
    @Test
    public void handleBuffers_outputsCorrectTimestamps() {
      List<Long> presentationTimesUs = new ArrayList<>();
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      presentationTimesUs.add(timestampTracker.getLastOutputBufferPresentationTimeUs(FORMAT));
  
      assertThat(presentationTimesUs).containsExactly(100_000L, 114_126L, 140_249L, 166_371L);
    }
  
    @Test
    public void handleBuffersWithReset_resetsTimestamps() {
      List<Long> presentationTimesUs = new ArrayList<>();
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      timestampTracker.reset();
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      presentationTimesUs.add(timestampTracker.getLastOutputBufferPresentationTimeUs(FORMAT));
  
      assertThat(presentationTimesUs).containsExactly(100_000L, 114_126L, 100_000L, 114_126L);
    }
  
    @Test
    public void handleInvalidBuffer_stopsUpdatingTimestamps() {
      List<Long> presentationTimesUs = new ArrayList<>();
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer));
      presentationTimesUs.add(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, invalidBuffer));
      presentationTimesUs.add(timestampTracker.getLastOutputBufferPresentationTimeUs(FORMAT));
  
      assertThat(presentationTimesUs).containsExactly(100_000L, 114_126L, 120_000L, 120_000L);
    }
  
    @Test
    public void firstTimestamp_matchesBuffer() {
      assertThat(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, buffer))
          .isEqualTo(buffer.timeUs);
      timestampTracker.reset();
      assertThat(timestampTracker.updateAndGetPresentationTimeUs(FORMAT, invalidBuffer))
          .isEqualTo(invalidBuffer.timeUs);
    }
  }
  