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.android.exoplayer2.testutil.TestUtil.getByteArray;
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.annotation.Nullable;
  import androidx.test.core.app.ApplicationProvider;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.metadata.Metadata;
  import com.google.android.exoplayer2.metadata.id3.ApicFrame;
  import com.google.android.exoplayer2.metadata.id3.CommentFrame;
  import com.google.android.exoplayer2.testutil.FakeExtractorInput;
  import java.io.IOException;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit test for {@link Id3Peeker}. */
  @RunWith(AndroidJUnit4.class)
  public final class Id3PeekerTest {
  
    @Test
    public void peekId3Data_returnNull_ifId3TagNotPresentAtBeginningOfInput() throws IOException {
      Id3Peeker id3Peeker = new Id3Peeker();
      FakeExtractorInput input =
          new FakeExtractorInput.Builder()
              .setData(new byte[] {1, 'I', 'D', '3', 2, 3, 4, 5, 6, 7, 8, 9, 10})
              .build();
  
      @Nullable Metadata metadata = id3Peeker.peekId3Data(input, /* id3FramePredicate= */ null);
      assertThat(metadata).isNull();
    }
  
    @Test
    public void peekId3Data_returnId3Tag_ifId3TagPresent() throws IOException {
      Id3Peeker id3Peeker = new Id3Peeker();
      FakeExtractorInput input =
          new FakeExtractorInput.Builder()
              .setData(
                  getByteArray(ApplicationProvider.getApplicationContext(), "media/id3/apic.id3"))
              .build();
  
      @Nullable Metadata metadata = id3Peeker.peekId3Data(input, /* id3FramePredicate= */ null);
      assertThat(metadata).isNotNull();
      assertThat(metadata.length()).isEqualTo(1);
  
      ApicFrame apicFrame = (ApicFrame) metadata.get(0);
      assertThat(apicFrame.mimeType).isEqualTo("image/jpeg");
      assertThat(apicFrame.pictureType).isEqualTo(16);
      assertThat(apicFrame.description).isEqualTo("Hello World");
      assertThat(apicFrame.pictureData).hasLength(10);
      assertThat(apicFrame.pictureData).isEqualTo(new byte[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 0});
    }
  
    @Test
    public void peekId3Data_returnId3TagAccordingToGivenPredicate_ifId3TagPresent()
        throws IOException {
      Id3Peeker id3Peeker = new Id3Peeker();
      FakeExtractorInput input =
          new FakeExtractorInput.Builder()
              .setData(
                  getByteArray(
                      ApplicationProvider.getApplicationContext(), "media/id3/comm_apic.id3"))
              .build();
  
      @Nullable
      Metadata metadata =
          id3Peeker.peekId3Data(
              input,
              (majorVersion, id0, id1, id2, id3) ->
                  id0 == 'C' && id1 == 'O' && id2 == 'M' && id3 == 'M');
      assertThat(metadata).isNotNull();
      assertThat(metadata.length()).isEqualTo(1);
  
      CommentFrame commentFrame = (CommentFrame) metadata.get(0);
      assertThat(commentFrame.language).isEqualTo("eng");
      assertThat(commentFrame.description).isEqualTo("description");
      assertThat(commentFrame.text).isEqualTo("text");
    }
  }
  