+tdm_client_voutput_add_commit_handler(tdm_client_voutput *voutput, tdm_client_voutput_commit_handler func, void *user_data);
+
+void
+tdm_client_voutput_remove_commit_handler(tdm_client_voutput *voutput, tdm_client_voutput_commit_handler func, void *user_data);