@java.lang.Override
  public com.google.protobuf.ByteString getOutputGcsUriBytes() {
    java.lang.Object ref = outputGcsUri_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      outputGcsUri_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Required. Specifies a Cloud Storage URI for the synthesis results. Must be
specified in the format: `gs://bucket_name/object_name`, and the bucket
must already exist.
</pre>

<code>string output_gcs_uri = 4 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for outputGcsUri.
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeLongAudioRequest.java