content: /*
   * Copyright (C) 2017 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.metadata.emsg;
  
  import com.google.android.exoplayer2.metadata.Metadata;
  import com.google.android.exoplayer2.metadata.MetadataInputBuffer;
  import com.google.android.exoplayer2.metadata.SimpleMetadataDecoder;
  import com.google.android.exoplayer2.util.Assertions;
  import com.google.android.exoplayer2.util.ParsableByteArray;
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  
  /** Decodes data encoded by {@link EventMessageEncoder}. */
  public final class EventMessageDecoder extends SimpleMetadataDecoder {
  
    @Override
    @SuppressWarnings("ByteBufferBackingArray") // Buffer validated by SimpleMetadataDecoder.decode
    protected Metadata decode(MetadataInputBuffer inputBuffer, ByteBuffer buffer) {
      return new Metadata(decode(new ParsableByteArray(buffer.array(), buffer.limit())));
    }
  
    public EventMessage decode(ParsableByteArray emsgData) {
      String schemeIdUri = Assertions.checkNotNull(emsgData.readNullTerminatedString());
      String value = Assertions.checkNotNull(emsgData.readNullTerminatedString());
      long durationMs = emsgData.readLong();
      long id = emsgData.readLong();
      byte[] messageData =
          Arrays.copyOfRange(emsgData.getData(), emsgData.getPosition(), emsgData.limit());
      return new EventMessage(schemeIdUri, value, durationMs, id, messageData);
    }
  }
  