public void synthesizeLongAudio(
        com.google.cloud.texttospeech.v1.SynthesizeLongAudioRequest request,
        io.grpc.stub.StreamObserver<com.google.longrunning.Operation> responseObserver) {
      io.grpc.stub.ClientCalls.asyncUnaryCall(
          getChannel().newCall(getSynthesizeLongAudioMethod(), getCallOptions()),
          request,
          responseObserver);
    }
<pre>
Synthesizes long form text asynchronously.
</pre>
java-texttospeech/grpc-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/TextToSpeechLongAudioSynthesizeGrpc.java