@java.lang.Override
    public boolean hasStreamingConfig() {
      return streamingRequestCase_ == 1;
    }
<pre>
StreamingSynthesizeConfig to be used in this streaming attempt. Only
specified in the first message sent in a `StreamingSynthesize` call.
</pre>

<code>.google.cloud.texttospeech.v1beta1.StreamingSynthesizeConfig streaming_config = 1;
</code>

@return Whether the streamingConfig field is set.
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/StreamingSynthesizeRequest.java