private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption,
            com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption.Builder,
            com.google.cloud.video.livestream.v1.Encryption.Aes128EncryptionOrBuilder>
        getAes128FieldBuilder() {
      if (aes128Builder_ == null) {
        if (!(encryptionModeCase_ == 4)) {
          encryptionMode_ =
              com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption.getDefaultInstance();
        }
        aes128Builder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption,
                com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption.Builder,
                com.google.cloud.video.livestream.v1.Encryption.Aes128EncryptionOrBuilder>(
                (com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption) encryptionMode_,
                getParentForChildren(),
                isClean());
        encryptionMode_ = null;
      }
      encryptionModeCase_ = 4;
      onChanged();
      return aes128Builder_;
    }
<pre>
Configuration for HLS AES-128 encryption.
</pre>

<code>.google.cloud.video.livestream.v1.Encryption.Aes128Encryption aes128 = 4;</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/Encryption.java