public final int getNumber() {
      if (this == UNRECOGNIZED) {
        throw new java.lang.IllegalArgumentException(
            "Can't get the number of an unknown enum value.");
      }
      return value;
    }
<pre>
Opus encoded audio frames in WebM container
([OggOpus](https://wiki.xiph.org/OggOpus)). `sample_rate_hertz` must be
one of 8000, 12000, 16000, 24000, or 48000.
</pre>

<code>WEBM_OPUS = 9;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/RecognitionConfig.java