content: /*
   * Copyright 2022 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.audio;
  
  import static com.google.common.truth.Truth.assertThat;
  import static org.junit.Assert.assertThrows;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.ParserException;
  import com.google.android.exoplayer2.util.Util;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit tests for {@link AacUtil}. */
  @RunWith(AndroidJUnit4.class)
  public final class AacUtilTest {
    private static final byte[] AAC_48K_2CH_HEADER = Util.getBytesFromHexString("1190");
  
    private static final byte[] NOT_ENOUGH_ARBITRARY_SAMPLING_FREQ_BITS_HEADER =
        Util.getBytesFromHexString("1790");
  
    private static final byte[] ARBITRARY_SAMPLING_FREQ_BITS_HEADER =
        Util.getBytesFromHexString("1780000790");
  
    @Test
    public void parseAudioSpecificConfig_twoCh48kAac_parsedCorrectly() throws Exception {
      AacUtil.Config aac = AacUtil.parseAudioSpecificConfig(AAC_48K_2CH_HEADER);
  
      assertThat(aac.channelCount).isEqualTo(2);
      assertThat(aac.sampleRateHz).isEqualTo(48000);
      assertThat(aac.codecs).isEqualTo("mp4a.40.2");
    }
  
    @Test
    public void parseAudioSpecificConfig_arbitrarySamplingFreqHeader_parsedCorrectly()
        throws Exception {
      AacUtil.Config aac = AacUtil.parseAudioSpecificConfig(ARBITRARY_SAMPLING_FREQ_BITS_HEADER);
      assertThat(aac.channelCount).isEqualTo(2);
      assertThat(aac.sampleRateHz).isEqualTo(15);
      assertThat(aac.codecs).isEqualTo("mp4a.40.2");
    }
  
    @Test
    public void
        parseAudioSpecificConfig_arbitrarySamplingFreqHeaderNotEnoughBits_throwsParserException() {
      // ISO 14496-3 1.6.2.1 allows for setting of arbitrary sampling frequency, but if the extra
      // frequency bits are missing, make sure the code will throw an exception.
      assertThrows(
          ParserException.class,
          () -> AacUtil.parseAudioSpecificConfig(NOT_ENOUGH_ARBITRARY_SAMPLING_FREQ_BITS_HEADER));
    }
  }
  