content: /*
   * Copyright (C) 2018 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.extractor;
  
  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;
  
  /** Unit test for {@link ConstantBitrateSeekMap}. */
  @RunWith(AndroidJUnit4.class)
  public final class ConstantBitrateSeekMapTest {
  
    private ConstantBitrateSeekMap constantBitrateSeekMap;
  
    @Test
    public void isSeekable_forKnownInputLength_returnSeekable() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 1000,
              /* firstFrameBytePosition= */ 0,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      assertThat(constantBitrateSeekMap.isSeekable()).isTrue();
    }
  
    @Test
    public void isSeekable_forUnknownInputLength_returnUnseekable() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ C.LENGTH_UNSET,
              /* firstFrameBytePosition= */ 0,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      assertThat(constantBitrateSeekMap.isSeekable()).isFalse();
    }
  
    @Test
    public void getSeekPoints_forUnseekableInput_returnSeekPoint0() {
      int firstBytePosition = 100;
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ C.LENGTH_UNSET,
              /* firstFrameBytePosition= */ firstBytePosition,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      SeekMap.SeekPoints seekPoints = constantBitrateSeekMap.getSeekPoints(/* timeUs= */ 123);
      assertThat(seekPoints.first.timeUs).isEqualTo(0);
      assertThat(seekPoints.first.position).isEqualTo(firstBytePosition);
      assertThat(seekPoints.second).isEqualTo(seekPoints.first);
    }
  
    @Test
    public void getDurationUs_forKnownInputLength_returnCorrectDuration() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      // Bitrate = 8000 (bits/s) = 1000 (bytes/s)
      // FrameSize = 100 (bytes), so 1 frame = 1s = 100_000 us
      // Input length = 2300 (bytes), first frame = 100, so duration = 2_200_000 us.
      assertThat(constantBitrateSeekMap.getDurationUs()).isEqualTo(2_200_000);
    }
  
    @Test
    public void getDurationUs_forUnnnownInputLength_returnUnknownDuration() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ C.LENGTH_UNSET,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      assertThat(constantBitrateSeekMap.getDurationUs()).isEqualTo(C.TIME_UNSET);
    }
  
    @Test
    public void getSeekPoints_forSeekableInput_forSyncPosition0_return1SeekPoint() {
      int firstBytePosition = 100;
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ firstBytePosition,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      SeekMap.SeekPoints seekPoints = constantBitrateSeekMap.getSeekPoints(/* timeUs= */ 0);
      assertThat(seekPoints.first.timeUs).isEqualTo(0);
      assertThat(seekPoints.first.position).isEqualTo(firstBytePosition);
      assertThat(seekPoints.second).isEqualTo(seekPoints.first);
    }
  
    @Test
    public void getSeekPoints_forSeekableInput_forSeekPointAtSyncPosition_return1SeekPoint() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      SeekMap.SeekPoints seekPoints = constantBitrateSeekMap.getSeekPoints(/* timeUs= */ 1_200_000);
      // Bitrate = 8000 (bits/s) = 1000 (bytes/s)
      // FrameSize = 100 (bytes), so 1 frame = 1s = 100_000 us
      assertThat(seekPoints.first.timeUs).isEqualTo(1_200_000);
      assertThat(seekPoints.first.position).isEqualTo(1300);
      assertThat(seekPoints.second).isEqualTo(seekPoints.first);
    }
  
    @Test
    public void getSeekPoints_forSeekableInput_forNonSyncSeekPosition_return2SeekPoints() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      SeekMap.SeekPoints seekPoints = constantBitrateSeekMap.getSeekPoints(/* timeUs= */ 345_678);
      // Bitrate = 8000 (bits/s) = 1000 (bytes/s)
      // FrameSize = 100 (bytes), so 1 frame = 1s = 100_000 us
      assertThat(seekPoints.first.timeUs).isEqualTo(300_000);
      assertThat(seekPoints.first.position).isEqualTo(400);
      assertThat(seekPoints.second.timeUs).isEqualTo(400_000);
      assertThat(seekPoints.second.position).isEqualTo(500);
    }
  
    @Test
    public void getSeekPoints_forSeekableInput_forSeekPointWithinLastFrame_return1SeekPoint() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      SeekMap.SeekPoints seekPoints = constantBitrateSeekMap.getSeekPoints(/* timeUs= */ 2_123_456);
      assertThat(seekPoints.first.timeUs).isEqualTo(2_100_000);
      assertThat(seekPoints.first.position).isEqualTo(2_200);
      assertThat(seekPoints.second).isEqualTo(seekPoints.first);
    }
  
    @Test
    public void getSeekPoints_forSeekableInput_forSeekPointAtEndOfStream_return1SeekPoint() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      SeekMap.SeekPoints seekPoints = constantBitrateSeekMap.getSeekPoints(/* timeUs= */ 2_200_000);
      assertThat(seekPoints.first.timeUs).isEqualTo(2_100_000);
      assertThat(seekPoints.first.position).isEqualTo(2_200);
      assertThat(seekPoints.second).isEqualTo(seekPoints.first);
    }
  
    @Test
    public void getTimeUsAtPosition_forPosition0_return0() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      long timeUs = constantBitrateSeekMap.getTimeUsAtPosition(0);
      assertThat(timeUs).isEqualTo(0);
    }
  
    @Test
    public void getTimeUsAtPosition_forPositionWithinStream_returnCorrectTime() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      long timeUs = constantBitrateSeekMap.getTimeUsAtPosition(1234);
      assertThat(timeUs).isEqualTo(1_134_000);
    }
  
    @Test
    public void getTimeUsAtPosition_forPositionAtEndOfStream_returnStreamDuration() {
      constantBitrateSeekMap =
          new ConstantBitrateSeekMap(
              /* inputLength= */ 2_300,
              /* firstFrameBytePosition= */ 100,
              /* bitrate= */ 8_000,
              /* frameSize= */ 100);
      long timeUs = constantBitrateSeekMap.getTimeUsAtPosition(2300);
      assertThat(timeUs).isEqualTo(constantBitrateSeekMap.getDurationUs());
    }
  }
  