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 typedef struct _RTP_header {
        /* byte 0 */
        #if (BYTE_ORDER == LITTLE_ENDIAN)
            unsigned char csrc_len:4;        /* expect 0 */
            unsigned char extension:1;        /* expect 1, see RTP_OP below */
            unsigned char padding:1;        /* expect 0 */
            unsigned char version:2;        /* expect 2 */
        #elif (BYTE_ORDER == BIG_ENDIAN)
            unsigned char version:2;
            unsigned char padding:1;
            unsigned char extension:1;
            unsigned char csrc_len:4;
        #else
            #error Neither big nor little
        #endif
        /* byte 1 */
        #if (BYTE_ORDER == LITTLE_ENDIAN)
            unsigned char payload:7;        /* RTP_PAYLOAD_RTSP */
            unsigned char marker:1;            /* expect 1 */
        #elif (BYTE_ORDER == BIG_ENDIAN)
            unsigned char marker:1;
            unsigned char payload:7;
       &n


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