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.extractor.mp4;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.ParserException;
  import com.google.android.exoplayer2.util.ParsableByteArray;
  import com.google.android.exoplayer2.util.Util;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Tests for {@link AtomParsers}. */
  @RunWith(AndroidJUnit4.class)
  public final class AtomParsersTest {
  
    private static final String ATOM_HEADER = "000000000000000000000000";
    private static final String SAMPLE_COUNT = "00000004";
    private static final byte[] FOUR_BIT_STZ2 =
        Util.getBytesFromHexString(ATOM_HEADER + "00000004" + SAMPLE_COUNT + "1234");
    private static final byte[] EIGHT_BIT_STZ2 =
        Util.getBytesFromHexString(ATOM_HEADER + "00000008" + SAMPLE_COUNT + "01020304");
    private static final byte[] SIXTEEN_BIT_STZ2 =
        Util.getBytesFromHexString(ATOM_HEADER + "00000010" + SAMPLE_COUNT + "0001000200030004");
  
    @Test
    public void parseCommonEncryptionSinfFromParentIgnoresUnknownSchemeType() throws ParserException {
      byte[] cencSinf =
          new byte[] {
            0, 0, 0, 24, 115, 105, 110, 102, // size (4), 'sinf' (4)
            0, 0, 0, 16, 115, 99, 104, 109, // size (4), 'schm' (4)
            0, 0, 0, 0, 88, 88, 88, 88
          }; // version (1), flags (3), 'xxxx' (4)
      assertThat(
              AtomParsers.parseCommonEncryptionSinfFromParent(
                  new ParsableByteArray(cencSinf), 0, cencSinf.length))
          .isNull();
    }
  
    @Test
    public void stz2Parsing4BitFieldSize() {
      verifyStz2Parsing(new Atom.LeafAtom(Atom.TYPE_stsz, new ParsableByteArray(FOUR_BIT_STZ2)));
    }
  
    @Test
    public void stz2Parsing8BitFieldSize() {
      verifyStz2Parsing(new Atom.LeafAtom(Atom.TYPE_stsz, new ParsableByteArray(EIGHT_BIT_STZ2)));
    }
  
    @Test
    public void stz2Parsing16BitFieldSize() {
      verifyStz2Parsing(new Atom.LeafAtom(Atom.TYPE_stsz, new ParsableByteArray(SIXTEEN_BIT_STZ2)));
    }
  
    private static void verifyStz2Parsing(Atom.LeafAtom stz2Atom) {
      AtomParsers.Stz2SampleSizeBox box = new AtomParsers.Stz2SampleSizeBox(stz2Atom);
      assertThat(box.getSampleCount()).isEqualTo(4);
      assertThat(box.getFixedSampleSize()).isEqualTo(C.LENGTH_UNSET);
      for (int i = 0; i < box.getSampleCount(); i++) {
        assertThat(box.readNextSampleSize()).isEqualTo(i + 1);
      }
    }
  }
  