134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/*
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* rtp.h -- RTP header file
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* RTP draft: November 1994 version
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*
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* $Id: rtp.h,v 0.9 2003/08/27 07:33:03 kkeil Exp $
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*/
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#define RTP_SEQ_MOD (1<<16)
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#define RTP_TS_MOD (0xffffffff)
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/*
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* Current type value.
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*/
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#define RTP_VERSION 2
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#define RTP_MAX_SDES 256 /* maximum text length for SDES */
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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 = 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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} rtcp_sdes_type_t;
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typedef enum {
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AE_PCMU,
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AE_1016,
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AE_G721,
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AE_GSM,
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AE_G723,
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AE_IDVI,
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AE_LPC,
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AE_PCMA,
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AE_L16,
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AE_G728,
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AE_MAX
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} audio_encoding_t;
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typedef struct {
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audio_encoding_t encoding; /* type of encoding (differs) */
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unsigned sample_rate; /* sample frames per second */
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unsigned channels; /* number of interleaved channels */
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} audio_descr_t;
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typedef struct {
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unsigned int version:2; /* protocol version */
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unsigned int p:1; /* padding flag */
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unsigned int x:1; /* header extension flag */
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unsigned int cc:4; /* CSRC count */
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unsigned int m:1; /* marker bit */
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unsigned int pt:7; /* payload type */
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u_int16_t seq; /* sequence number */
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u_int32_t ts; /* timestamp */
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u_int32_t ssrc; /* synchronization source */
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u_int32_t csrc[1]; /* optional CSRC list */
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} rtp_hdr_t;
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typedef struct {
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unsigned int version:2; /* protocol version */
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unsigned int p:1; /* padding flag */
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unsigned int count:5; /* varies by payload type */
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unsigned int pt:8; /* payload type */
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u_int16_t 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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u_int32_t ssrc; /* data source being reported */
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unsigned int fraction:8; /* fraction lost since last SR/RR */
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int lost:24; /* cumulative number of packets lost (signed!) */
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u_int32_t last_seq; /* extended last sequence number received */
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u_int32_t jitter; /* interarrival jitter */
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u_int32_t lsr; /* last SR packet from this source */
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u_int32_t dlsr; /* delay since last SR packet */
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} rtcp_rr_t;
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typedef struct {
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u_int8_t type; /* type of SDES item (rtcp_sdes_type_t) */
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u_int8_t 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_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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/* sender report (SR) */
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struct {
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u_int32_t ssrc; /* source this RTCP packet refers to */
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u_int32_t ntp_sec; /* NTP timestamp */
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u_int32_t ntp_frac;
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u_int32_t rtp_ts; /* RTP timestamp */
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u_int32_t psent; /* packets sent */
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u_int32_t osent; /* octets sent */
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/* variable-length list */
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rtcp_rr_t rr[1];
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} sr;
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/* reception report (RR) */
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struct {
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u_int32_t ssrc; /* source this generating this report */
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/* variable-length list */
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rtcp_rr_t rr[1];
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} rr;
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/* BYE */
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struct {
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u_int32_t src[1]; /* list of sources */
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/* can't express trailing text */
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} bye;
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/* source description (SDES) */
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struct rtcp_sdes_t {
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u_int32_t src; /* first SSRC/CSRC */
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rtcp_sdes_item_t item[1]; /* list of SDES items */
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} sdes;
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} r;
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} rtcp_t;
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