@java.lang.Override
        public com.google.protobuf.ByteString getFormatBytes() {
            java.lang.Object ref = format_;
            if (ref instanceof java.lang.String) {
                com.google.protobuf.ByteString b =
                        com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
                format_ = b;
                return b;
            } else {
                return (com.google.protobuf.ByteString) ref;
            }
        }
<code>optional string format = 4;</code>

@return The bytes for format.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/model/file/AudioFile.java