public OperationCallable<
          SynthesizeLongAudioRequest, SynthesizeLongAudioResponse, SynthesizeLongAudioMetadata>
      synthesizeLongAudioOperationCallable() {
    throw new UnsupportedOperationException(
        "Not implemented: synthesizeLongAudioOperationCallable()");
  }
Base stub class for the TextToSpeechLongAudioSynthesize service API.

<p>This class is for advanced usage and reflects the underlying API directly.
java-texttospeech/google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1beta1/stub/TextToSpeechLongAudioSynthesizeStub.java