public Builder mergeAes128(
        com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption value) {
      if (aes128Builder_ == null) {
        if (encryptionModeCase_ == 4
            && encryptionMode_
                != com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption
                    .getDefaultInstance()) {
          encryptionMode_ =
              com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption.newBuilder(
                      (com.google.cloud.video.livestream.v1.Encryption.Aes128Encryption)
                          encryptionMode_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          encryptionMode_ = value;
        }
        onChanged();
      } else {
        if (encryptionModeCase_ == 4) {
          aes128Builder_.mergeFrom(value);
        } else {
          aes128Builder_.setMessage(value);
        }
      }
      encryptionModeCase_ = 4;
      return this;
    }
<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