public Builder setLanguageCode(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      languageCode_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Required. *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/docs/languages)
for a list of the currently supported language codes.
</pre>

<code>string language_code = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@param value The languageCode to set.
@return This builder for chaining.
java-video-intelligence/proto-google-cloud-video-intelligence-v1p3beta1/src/main/java/com/google/cloud/videointelligence/v1p3beta1/SpeechTranscriptionConfig.java