syntax="proto2";
package example;

option cc_generic_services = true;



message AudioRequest {
      required string audio = 1;
      required string extra = 2; 
};

message AudioResponse {
      required int32 err_no = 1;
      required string err_msg = 2;
      required string result = 3;
      required float cost_time = 4;
};

service EchoService {
      rpc audiorecognition(AudioRequest) returns (AudioResponse);
};