content: /*
   * Copyright (C) 2021 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.util;
  
  import static com.google.android.exoplayer2.util.TimestampAdjuster.MODE_NO_OFFSET;
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Tests for {@link TimestampAdjuster}. */
  @RunWith(AndroidJUnit4.class)
  public class TimestampAdjusterTest {
  
    @Test
    public void adjustSampleTimestamp_fromZero() {
      TimestampAdjuster adjuster = new TimestampAdjuster(/* firstSampleTimestampUs= */ 0);
      long firstAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 2000);
      long secondAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 6000);
  
      assertThat(firstAdjustedTimestampUs).isEqualTo(0);
      assertThat(secondAdjustedTimestampUs).isEqualTo(4000);
    }
  
    @Test
    public void adjustSampleTimestamp_fromNonZero() {
      TimestampAdjuster adjuster = new TimestampAdjuster(/* firstSampleTimestampUs= */ 1000);
      long firstAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 2000);
      long secondAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 6000);
  
      assertThat(firstAdjustedTimestampUs).isEqualTo(1000);
      assertThat(secondAdjustedTimestampUs).isEqualTo(5000);
    }
  
    @Test
    public void adjustSampleTimestamp_noOffset() {
      TimestampAdjuster adjuster =
          new TimestampAdjuster(/* firstSampleTimestampUs= */ MODE_NO_OFFSET);
      long firstAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 2000);
      long secondAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 6000);
  
      assertThat(firstAdjustedTimestampUs).isEqualTo(2000);
      assertThat(secondAdjustedTimestampUs).isEqualTo(6000);
    }
  
    @Test
    public void adjustSampleTimestamp_afterResetToNoOffset() {
      TimestampAdjuster adjuster = new TimestampAdjuster(/* firstSampleTimestampUs= */ 0);
      // Let the adjuster establish an offset, to make sure that reset really clears it.
      adjuster.adjustSampleTimestamp(/* timeUs= */ 1000);
      adjuster.reset(/* firstSampleTimestampUs= */ MODE_NO_OFFSET);
      long firstAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 2000);
      long secondAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 6000);
  
      assertThat(firstAdjustedTimestampUs).isEqualTo(2000);
      assertThat(secondAdjustedTimestampUs).isEqualTo(6000);
    }
  
    @Test
    public void adjustSampleTimestamp_afterResetToDifferentStartTime() {
      TimestampAdjuster adjuster = new TimestampAdjuster(/* firstSampleTimestampUs= */ 0);
      // Let the adjuster establish an offset, to make sure that reset really clears it.
      adjuster.adjustSampleTimestamp(/* timeUs= */ 1000);
      adjuster.reset(/* firstSampleTimestampUs= */ 5000);
      long firstAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 2000);
      long secondAdjustedTimestampUs = adjuster.adjustSampleTimestamp(/* timeUs= */ 6000);
  
      assertThat(firstAdjustedTimestampUs).isEqualTo(5000);
      assertThat(secondAdjustedTimestampUs).isEqualTo(9000);
    }
  }
  