@java.lang.Override
    public int getAudioEncodingValue() {
      return audioEncoding_;
    }
<pre>
Required. The format of the audio byte stream.
For now, streaming only supports PCM and OGG_OPUS. All other encodings
will return an error.
</pre>

<code>
.google.cloud.texttospeech.v1beta1.AudioEncoding audio_encoding = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return The enum numeric value on the wire for audioEncoding.
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/StreamingAudioConfig.java