117 lines
3 KiB
C
117 lines
3 KiB
C
/*
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RTP.H
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RTP structures and prototypes
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*/
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#ifndef _RTP_H_
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#define _RTP_H_
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#include <pshpack8.h> /* Assume 8 byte packing throughout */
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#define RTP_VERSION 2
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/* Defined in rrcm_dll.h
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typedef enum {
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RTCP_SDES_END = 0,
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RTCP_SDES_CNAME = 1,
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RTCP_SDES_NAME = 2,
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RTCP_SDES_EMAIL = 3,
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RTCP_SDES_PHONE = 4,
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RTCP_SDES_LOC = 5,
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RTCP_SDES_TOOL = 6,
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RTCP_SDES_NOTE = 7,
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RTCP_SDES_PRIV = 8,
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RTCP_SDES_IMG = 9,
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RTCP_SDES_DOOR = 10,
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RTCP_SDES_SOURCE = 11
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} SDES_TYPE;
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*/
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typedef enum {
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RTCP_TYPE_SR = 200, // sender report
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RTCP_TYPE_RR = 201, // receiver report
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RTCP_TYPE_SDES = 202, // source description
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RTCP_TYPE_BYE = 203, // end of session
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RTCP_TYPE_APP = 204 // app. specific
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} RTCP_TYPE;
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typedef unsigned __int64 NTP_TS;
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typedef struct {
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// !!! WARNING !!!
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// The following word doesn't need to be swapped for NtoH()
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unsigned short cc:4; /* CSRC count */
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unsigned short x:1; /* header extension flag */
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unsigned short p:1; /* padding flag */
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unsigned short version:2; /* protocol version */
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unsigned short payload:7; /* payload type */
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unsigned short m:1; /* marker bit */
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WORD seq; /* sequence number */
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DWORD ts; /* timestamp */
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DWORD ssrc; /* synchronization source */
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//DWORD csrc[1]; /* optional CSRC list */
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} RTP_HDR;
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// common part of RTCP header
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typedef struct {
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unsigned short version:2; /* protocol version */
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unsigned short p:1; /* padding flag */
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unsigned short count:5; /* varies by payload type */
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unsigned short rtcpType:8; /* payload type */
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WORD length; /* packet length in dwords, without this hdr */
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} RTCP_HDR;
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/* reception report */
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typedef struct {
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DWORD ssrc; /* data source being reported */
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BYTE fracLost; /* fraction lost since last SR/RR */
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BYTE lostHi; /* cumulative number of packets lost (signed!) */
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WORD lostLo;
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DWORD lastSeq; /* extended last sequence number received */
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DWORD jitter; /* interarrival jitter */
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DWORD lastSR; /* last SR packet from this source */
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DWORD delayLastSR; /* delay since last SR packet */
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} RTCP_RR;
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/* sender report (SR) */
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typedef struct {
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DWORD ssrc; /* source this RTCP packet refers to */
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DWORD ntpHi; /* NTP timestamp - seconds */
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DWORD ntpLo; /* mantissa */
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DWORD timestamp; /* RTP timestamp */
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DWORD packetsSent; /* packets sent */
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DWORD bytesSent; /* octets sent */
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/* variable-length list */
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//RTCP_RR rr[1];
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} RTCP_SR;
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/* BYE */
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typedef struct {
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DWORD src[1]; /* list of sources */
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/* can't express trailing text */
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} RTCP_BYE;
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typedef struct {
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BYTE type; /* type of SDES item (rtcp_sdes_type_t) */
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BYTE length; /* length of SDES item (in octets) */
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char data[1]; /* text, not zero-terminated */
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} RTCP_SDES_ITEM;
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/* source description (SDES) */
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typedef struct {
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DWORD src; /* first SSRC/CSRC */
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RTCP_SDES_ITEM item[1]; /* list of SDES items */
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} RTCP_SDES;
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#define INVALID_RTP_SEQ_NUMBER 0xffffffff
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#include <poppack.h> /* End byte packing */
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#endif // _RTP_H_
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