rt

#ifndef _INC_RTP
#define _INC_RTP

#define RTP_TYPE 2
#define RTP_MAX_SDES 256
#define RTP_MAX_EKEY 32

typedef struct _RTP_SDES_ITEM {
BYTE Type;
BYTE TextLength;
BYTE Text[RTP_MAX_SDES];
} RTCP_SDES_ITEM, *PRTCP_SDES_ITEM;

typedef struct _RTCP_SENDER_REPORT {
DWORD NtpTimestampSec;
DWORD NtpTimestampFrac;
DWORD RtpTimestamp;
DWORD TotalPackets;
DWORD TotalOctets;
} RTCP_SENDER_REPORT, *PRTCP_SENDER_REPORT;

typedef struct _RTCP_RECEIVER_REPORT {
DWORD FractionLost:8;
DWORD TotalLostPackets:24;
DWORD HighestSequenceNum;
DWORD InterarrivalJitter;
DWORD LastSRTimestamp;
DWORD DelaySinceLastSR;
} RTCP_RECEIVER_REPORT, *PRTCP_RECEIVER_REPORT;

typedef struct _RTCP_PARTICIPANT_REPORT {
DWORD SSRC;
RTCP_SENDER_REPORT LastSR;
RTCP_RECEIVER_REPORT LastIncomingRR;
RTCP_RECEIVER_REPORT LastOutgoingRR;
} RTCP_PARTICIPANT_REPORT, *PRTCP_PARTICIPANT_REPORT;

typedef struct _RTP_HEADER {
//--- NETWORK BYTE ORDER BEGIN ---//
WORD NumCSRC:4;
WORD fExtHeader:1;
WORD fPadding:1;
WORD Version:2;
WORD PayloadType:7;
WORD fMarker:1;
//---- NETWORK BYTE ORDER END ----//
WORD SequenceNum;
DWORD Timestamp;
DWORD SSRC;
} RTP_HEADER, *PRTP_HEADER;

typedef struct _RTP_HEADER_X {
WORD Identifier;
WORD DataLength;
DWORD Data[1];
} RTP_HEADER_X, *PRTP_HEADER_X;

typedef struct _RTP_ENCRYPTION_INFO {
DWORD Scheme;
DWORD Key[RTP_MAX_EKEY];
} RTP_ENCRYPTION_INFO, *PRTP_ENCRYPTION_INFO;

#endif // _INC_RTP

意义：变量长度
单位：位