content: /*
   * Copyright (C) 2016 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.drm;
  
  import static com.google.android.exoplayer2.C.PLAYREADY_UUID;
  import static com.google.android.exoplayer2.C.UUID_NIL;
  import static com.google.android.exoplayer2.C.WIDEVINE_UUID;
  import static com.google.android.exoplayer2.util.MimeTypes.VIDEO_MP4;
  import static com.google.common.truth.Truth.assertThat;
  
  import android.os.Parcel;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.drm.DrmInitData.SchemeData;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Random;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit test for {@link DrmInitData}. */
  @RunWith(AndroidJUnit4.class)
  public class DrmInitDataTest {
  
    private static final SchemeData DATA_1 =
        new SchemeData(WIDEVINE_UUID, VIDEO_MP4, buildTestData(128, 1 /* data seed */));
    private static final SchemeData DATA_2 =
        new SchemeData(PLAYREADY_UUID, VIDEO_MP4, buildTestData(128, 2 /* data seed */));
    private static final SchemeData DATA_1B =
        new SchemeData(WIDEVINE_UUID, VIDEO_MP4, buildTestData(128, 1 /* data seed */));
    private static final SchemeData DATA_2B =
        new SchemeData(PLAYREADY_UUID, VIDEO_MP4, buildTestData(128, 2 /* data seed */));
    private static final SchemeData DATA_UNIVERSAL =
        new SchemeData(C.UUID_NIL, VIDEO_MP4, buildTestData(128, 3 /* data seed */));
  
    @Test
    public void parcelable() {
      DrmInitData drmInitDataToParcel = new DrmInitData(DATA_1, DATA_2);
  
      Parcel parcel = Parcel.obtain();
      drmInitDataToParcel.writeToParcel(parcel, 0);
      parcel.setDataPosition(0);
  
      DrmInitData drmInitDataFromParcel = DrmInitData.CREATOR.createFromParcel(parcel);
      assertThat(drmInitDataFromParcel).isEqualTo(drmInitDataToParcel);
  
      parcel.recycle();
    }
  
    @Test
    public void equals() {
      DrmInitData drmInitData = new DrmInitData(DATA_1, DATA_2);
  
      // Basic non-referential equality test.
      DrmInitData testInitData = new DrmInitData(DATA_1, DATA_2);
      assertThat(testInitData).isEqualTo(drmInitData);
      assertThat(testInitData.hashCode()).isEqualTo(drmInitData.hashCode());
  
      // Basic non-referential equality test with non-referential scheme data.
      testInitData = new DrmInitData(DATA_1B, DATA_2B);
      assertThat(testInitData).isEqualTo(drmInitData);
      assertThat(testInitData.hashCode()).isEqualTo(drmInitData.hashCode());
  
      // Passing the scheme data in reverse order shouldn't affect equality.
      testInitData = new DrmInitData(DATA_2, DATA_1);
      assertThat(testInitData).isEqualTo(drmInitData);
      assertThat(testInitData.hashCode()).isEqualTo(drmInitData.hashCode());
  
      // Ditto.
      testInitData = new DrmInitData(DATA_2B, DATA_1B);
      assertThat(testInitData).isEqualTo(drmInitData);
      assertThat(testInitData.hashCode()).isEqualTo(drmInitData.hashCode());
  
      // Different number of tuples should affect equality.
      testInitData = new DrmInitData(DATA_1);
      assertThat(drmInitData).isNotEqualTo(testInitData);
  
      // Different data in one of the tuples should affect equality.
      testInitData = new DrmInitData(DATA_1, DATA_UNIVERSAL);
      assertThat(testInitData).isNotEqualTo(drmInitData);
    }
  
    @Test
    public void getByIndex() {
      DrmInitData testInitData = new DrmInitData(DATA_1, DATA_2);
      assertThat(getAllSchemeData(testInitData)).containsAtLeast(DATA_1, DATA_2);
    }
  
    @Test
    public void schemeDatasWithSameUuid() {
      DrmInitData testInitData = new DrmInitData(DATA_1, DATA_1B);
  
      assertThat(testInitData.schemeDataCount).isEqualTo(2);
      // Test retrieval of first and second entry.
      assertThat(testInitData.get(0)).isEqualTo(DATA_1);
      assertThat(testInitData.get(1)).isEqualTo(DATA_1B);
    }
  
    @Test
    public void schemeDataMatches() {
      assertThat(DATA_1.matches(WIDEVINE_UUID)).isTrue();
      assertThat(DATA_1.matches(PLAYREADY_UUID)).isFalse();
      assertThat(DATA_2.matches(UUID_NIL)).isFalse();
  
      assertThat(DATA_2.matches(WIDEVINE_UUID)).isFalse();
      assertThat(DATA_2.matches(PLAYREADY_UUID)).isTrue();
      assertThat(DATA_2.matches(UUID_NIL)).isFalse();
  
      assertThat(DATA_UNIVERSAL.matches(WIDEVINE_UUID)).isTrue();
      assertThat(DATA_UNIVERSAL.matches(PLAYREADY_UUID)).isTrue();
      assertThat(DATA_UNIVERSAL.matches(UUID_NIL)).isTrue();
    }
  
    private List<SchemeData> getAllSchemeData(DrmInitData drmInitData) {
      ArrayList<SchemeData> schemeDatas = new ArrayList<>();
      for (int i = 0; i < drmInitData.schemeDataCount; i++) {
        schemeDatas.add(drmInitData.get(i));
      }
      return schemeDatas;
    }
  
    /** Generates an array of random bytes with the specified length. */
    // TODO(internal b/161804035): Use TestUtils when it's available in a dependency we can use here.
    private static byte[] buildTestData(int length, int seed) {
      byte[] source = new byte[length];
      new Random(seed).nextBytes(source);
      return source;
    }
  }
  