@io.grpc.ExperimentalApi("https://github.com/grpc/grpc-java/issues/10918")
    public io.grpc.stub.BlockingClientCall<
            com.google.cloud.texttospeech.v1beta1.StreamingSynthesizeRequest,
            com.google.cloud.texttospeech.v1beta1.StreamingSynthesizeResponse>
        streamingSynthesize() {
      return io.grpc.stub.ClientCalls.blockingBidiStreamingCall(
          getChannel(), getStreamingSynthesizeMethod(), getCallOptions());
    }
<pre>
Performs bidirectional streaming speech synthesis: receive audio while
sending text.
</pre>
java-texttospeech/grpc-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/TextToSpeechGrpc.java