default void synthesizeLongAudio(
        com.google.cloud.texttospeech.v1beta1.SynthesizeLongAudioRequest request,
        io.grpc.stub.StreamObserver<com.google.longrunning.Operation> responseObserver) {
      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(
          getSynthesizeLongAudioMethod(), responseObserver);
    }
<pre>
Synthesizes long form text asynchronously.
</pre>
java-texttospeech/grpc-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/TextToSpeechLongAudioSynthesizeGrpc.java