public com.google.protobuf.ByteString getLanguageCodeBytes() {
      java.lang.Object ref = languageCode_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        languageCode_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
Required. The language of the supplied audio as a
[BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tag.
Example: "en-US".
See [Language
Support](https://cloud.google.com/speech-to-text/docs/languages) for a list
of the currently supported language codes.
</pre>

<code>string language_code = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for languageCode.
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/RecognitionConfig.java