135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
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/*
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* Filename: RTP.H
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*
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* RTP related data structures.
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*
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* INTEL Corporation Proprietary Information
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* This listing is supplied under the terms of a license agreement with
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* Intel Corporation and may not be copied nor disclosed except in
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* accordance with the terms of that agreement.
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* Copyright (c) 1995 Intel Corporation.
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*--------------------------------------------------------------------------*/
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#ifndef _RTP_H_
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#define _RTP_H_
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#define RTP_HDR_MIN_LEN 12
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#define RTP_SEQ_MOD (1<<16)
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#define RTP_TS_MOD (0xffffffff)
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#define RTP_TYPE 2 /* Current version */
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#define RTP_MAX_SDES 256 /* maximum text length for SDES */
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#define RTCP_SIZE_GAIN (1./16.)
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#define NTWRK_HDR_SIZE 28
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typedef enum {
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RTCP_SR = 200,
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RTCP_RR = 201,
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RTCP_SDES = 202,
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RTCP_BYE = 203,
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RTCP_APP = 204
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} RTCP_TYPE_T;
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typedef enum {
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RTCP_SDES_END,
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RTCP_SDES_CNAME,
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RTCP_SDES_NAME,
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RTCP_SDES_EMAIL,
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RTCP_SDES_PHONE,
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RTCP_SDES_LOC,
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RTCP_SDES_TOOL,
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RTCP_SDES_TXT,
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RTCP_SDES_PRIV
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} RTCP_SDES_TYPE_T;
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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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WORD cc:4; /* CSRC count */
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WORD x:1; /* header extension flag */
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WORD p:1; /* padding flag */
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WORD type:2; /* version type 1/2 */
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WORD pt:7; /* payload type */
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WORD 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_T;
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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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WORD count:5; /* varies by payload type */
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WORD p:1; /* padding flag */
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WORD type:2; /* protocol version */
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WORD pt:8; /* payload type */
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WORD length; /* packet length in words, without this word */
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} RTCP_COMMON_T;
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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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DWORD received; /* cumulative number of packets received */
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DWORD expected; /* cumulative number of packets expected */
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DWORD jitter; /* interarrival jitter */
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DWORD lsr; /* last SR packet from this source */
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DWORD dlsr; /* delay since last SR packet */
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} RTCP_RR_T;
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typedef struct {
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BYTE sdesType; /* type of SDES item (rtcp_sdes_type_t) */
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BYTE sdesLength; /* length of SDES item (in octets) */
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char sdesData[1]; /* text, not zero-terminated */
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} RTCP_SDES_ITEM_T;
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typedef struct {
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DWORD ssrc; /* source this RTCP packet refers to */
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DWORD ntp_sec; /* NTP timestamp */
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DWORD ntp_frac;
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DWORD rtp_ts; /* RTP timestamp */
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DWORD psent; /* packets sent */
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DWORD osent; /* octets sent */
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RTCP_RR_T rr[1]; /* variable-length list */
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} SENDER_RPT;
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typedef struct {
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DWORD ssrc; /* source this generating this report */
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RTCP_RR_T rr[1]; /* variable-length list */
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} RECEIVER_RPT;
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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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} BYE_PCKT;
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typedef struct {
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DWORD src; /* first SSRC/CSRC */
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RTCP_SDES_ITEM_T item[1]; /* list of SDES items */
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} RTCP_SDES_T;
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/* one RTCP packet */
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typedef struct {
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RTCP_COMMON_T common; /* common header */
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union
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{
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SENDER_RPT sr; /* sender report (SR) */
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RECEIVER_RPT rr; /* reception report (RR) */
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BYE_PCKT bye; /* BYE */
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RTCP_SDES_T sdes; /* source description (SDES) */
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} r;
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} RTCP_T;
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typedef DWORD MEMBER_T;
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#endif /* ifndef _RTP_H_ */
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