private void ensureMappingIsMutable() {
      if (!((bitField0_ & 0x00000004) != 0)) {
        mapping_ =
            new java.util.ArrayList<com.google.cloud.video.transcoder.v1.TextStream.TextMapping>(
                mapping_);
        bitField0_ |= 0x00000004;
      }
    }
<pre>
The BCP-47 language code, such as `en-US` or `sr-Latn`. For more
information, see
https://www.unicode.org/reports/tr35/#Unicode_locale_identifier. Not
supported in MP4 files.
</pre>

<code>string language_code = 2;</code>

@param value The bytes for languageCode to set.
@return This builder for chaining.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/TextStream.java