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 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.metadata.Metadata;
  import com.google.android.exoplayer2.metadata.MetadataInputBuffer;
  import com.google.android.exoplayer2.util.Assertions;
  import com.google.android.exoplayer2.util.ParsableByteArray;
  import com.google.common.primitives.Bytes;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit test for {@link EventMessageEncoder}. */
  @RunWith(AndroidJUnit4.class)
  public final class EventMessageEncoderTest {
  
    private static final EventMessage DECODED_MESSAGE =
        new EventMessage("urn:test", "123", 3000, 1000403, new byte[] {0, 1, 2, 3, 4});
  
    private static final byte[] ENCODED_MESSAGE =
        Bytes.concat(
            createByteArray(117, 114, 110, 58, 116, 101, 115, 116, 0), // scheme_id_uri = "urn:test"
            createByteArray(49, 50, 51, 0), // value = "123"
            createByteArray(0, 0, 0, 0, 0, 0, 11, 184), // event_duration_ms = 3000
            createByteArray(0, 0, 0, 0, 0, 15, 67, 211), // id = 1000403
            createByteArray(0, 1, 2, 3, 4)); // message_data = {0, 1, 2, 3, 4}
  
    @Test
    public void encodeEventStream() throws IOException {
      byte[] encodedByteArray = new EventMessageEncoder().encode(DECODED_MESSAGE);
      assertThat(encodedByteArray).isEqualTo(ENCODED_MESSAGE);
    }
  
    @Test
    public void encodeDecodeEventStream() throws IOException {
      byte[] encodedByteArray = new EventMessageEncoder().encode(DECODED_MESSAGE);
      MetadataInputBuffer buffer = createMetadataInputBuffer(encodedByteArray);
  
      EventMessageDecoder decoder = new EventMessageDecoder();
      Metadata metadata = decoder.decode(buffer);
      assertThat(metadata.length()).isEqualTo(1);
      assertThat(metadata.get(0)).isEqualTo(DECODED_MESSAGE);
    }
  
    @Test
    public void encodeEventStreamMultipleTimesWorkingCorrectly() throws IOException {
      EventMessage eventMessage1 =
          new EventMessage("urn:test", "123", 3000, 1000402, new byte[] {4, 3, 2, 1, 0});
      byte[] expectedEmsgBody1 =
          Bytes.concat(
              createByteArray(117, 114, 110, 58, 116, 101, 115, 116, 0), // scheme_id_uri = "urn:test"
              createByteArray(49, 50, 51, 0), // value = "123"
              createByteArray(0, 0, 0, 0, 0, 0, 11, 184), // event_duration_ms = 3000
              createByteArray(0, 0, 0, 0, 0, 15, 67, 210), // id = 1000402
              createByteArray(4, 3, 2, 1, 0)); // message_data = {4, 3, 2, 1, 0}
  
      EventMessageEncoder eventMessageEncoder = new EventMessageEncoder();
      byte[] encodedByteArray = eventMessageEncoder.encode(DECODED_MESSAGE);
      assertThat(encodedByteArray).isEqualTo(ENCODED_MESSAGE);
      byte[] encodedByteArray1 = eventMessageEncoder.encode(eventMessage1);
      assertThat(encodedByteArray1).isEqualTo(expectedEmsgBody1);
    }
  
    // https://github.com/google/ExoPlayer/issues/9123
    @Test
    public void encodeDecodeEventMessage_durationNotSet() {
      EventMessage originalMessage =
          new EventMessage("urn:test", "456", C.TIME_UNSET, 99, new byte[] {7, 8, 9});
      byte[] encodedMessage = new EventMessageEncoder().encode(originalMessage);
      EventMessage decodedMessage =
          new EventMessageDecoder().decode(new ParsableByteArray(encodedMessage));
  
      assertThat(decodedMessage).isEqualTo(originalMessage);
    }
  
    /** Converts an array of integers in the range [0, 255] into an equivalent byte array. */
    // TODO(internal b/161804035): Move to a single file.
    private static byte[] createByteArray(int... bytes) {
      byte[] byteArray = new byte[bytes.length];
      for (int i = 0; i < byteArray.length; i++) {
        Assertions.checkState(0x00 <= bytes[i] && bytes[i] <= 0xFF);
        byteArray[i] = (byte) bytes[i];
      }
      return byteArray;
    }
  
    /**
     * Create a new {@link MetadataInputBuffer} and copy {@code data} into the backing {@link
     * ByteBuffer}.
     */
    // TODO(internal b/161804035): Use TestUtils when it's available in a dependency we can use here.
    private static MetadataInputBuffer createMetadataInputBuffer(byte[] data) {
      MetadataInputBuffer buffer = new MetadataInputBuffer();
      buffer.data = ByteBuffer.allocate(data.length).put(data);
      buffer.data.flip();
      return buffer;
    }
  }
  