[완료]Byte 경계를 넘는(?) 비트필드 값의 해석..

typedef struct {
	/* The following are pointers to the data in the packet as    */
	/* it came off the wire. The packet it read in such that the  */
	/* header maps onto the latter part of this struct, and the   */
	/* fields in this first part of the struct point into it. The */
	/* entire packet can be freed by freeing this struct, without */
	/* having to free the csrc, data and extn blocks separately.  */
	/* WARNING: Don't change the size of the first portion of the */
	/* struct without changing RTP_PACKET_HEADER_SIZE to match.   */
	uint32_t	*csrc;
	char		*data;
	int		 data_len;
	unsigned char	*extn;
	uint16_t	 extn_len;	/* Size of the extension in 32 bit words minus one */
	uint16_t	 extn_type;	/* Extension type field in the RTP packet header   */
	/* The following map directly onto the RTP packet header...   */
#ifdef WORDS_BIGENDIAN
	unsigned short   v:2;		/* packet type                */
	unsigned short   p:1;		/* padding flag               */
	unsigned short   x:1;		/* header extension flag      */
	unsigned short   cc:4;		/* CSRC count                 */
	unsigned short   m:1;		/* marker bit                 */
	unsigned short   pt:7;		/* payload type               */
#else
	unsigned short   cc:4;		/* CSRC count                 */
	unsigned short   x:1;		/* header extension flag      */
	unsigned short   p:1;		/* padding flag               */
	unsigned short   v:2;		/* packet type                */
	unsigned short   pt:7;		/* payload type               */
	unsigned short   m:1;		/* marker bit                 */
#endif
	uint16_t          seq;		/* sequence number            */
	uint32_t          ts;		/* timestamp                  */
	uint32_t          ssrc;		/* synchronization source     */
	/* The csrc list, header extension and data follow, but can't */
	/* be represented in the struct.                              */
} rtp_packet;