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/*
* FILE: rtp.h
* AUTHOR: Colin Perkins <c.perkins@cs.ucl.ac.uk>
*
* $Revision: 1.11 $
* $Date: 1999/04/05 20:04:49 $
*
* Copyright (c) 1998-99 University College London
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Science
* Department at University College London.
* 4. Neither the name of the University nor of the Department may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define RTP_PACKET_HEADER_SIZE ((sizeof(char *) * 2) + sizeof(u_int32 *) + (2 * sizeof(int)))
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. */
u_int32 *csrc;
char *data;
int data_len;
char *extn;
int extn_len;
/* The following map directly onto the RTP packet header... */
#ifndef DIFF_BYTE_ORDER
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
u_int16 seq; /* sequence number */
u_int32 ts; /* timestamp */
u_int32 ssrc; /* synchronization source */
/* The csrc list, header extension and data follow, but can't */
/* be represented in the struct. */
} rtp_packet;
typedef struct {
u_int32 ssrc;
u_int32 ntp_sec;
u_int32 ntp_frac;
u_int32 rtp_ts;
u_int32 sender_pcount;
u_int32 sender_bcount;
} rtcp_sr;
typedef struct {
u_int32 ssrc; /* The ssrc to which this RR pertains */
#ifndef DIFF_BYTE_ORDER
u_int32 fract_lost:8;
u_int32 total_lost:24;
#else
u_int32 total_lost:24;
u_int32 fract_lost:8;
#endif
u_int32 last_seq;
u_int32 jitter;
u_int32 lsr;
u_int32 dlsr;
} rtcp_rr;
typedef struct {
u_int8 type; /* type of SDES item */
u_int8 length; /* length of SDES item (in bytes) */
char data[1]; /* text, not zero-terminated */
} rtcp_sdes_item;
typedef struct {
u_int32 ssrc;
int type;
void *data;
struct timeval *ts;
} rtp_event;
/* rtp_event type values... */
#define RX_RTP 100
#define RX_SR 101
#define RX_RR 102
#define RX_SDES 103
#define RX_BYE 104 /* Source is leaving the session, database entry is still valid */
#define SOURCE_DELETED 105 /* Source has been removed from the database */
/* SDES packet types... */
#define RTCP_SDES_END 0
#define RTCP_SDES_CNAME 1
#define RTCP_SDES_NAME 2
#define RTCP_SDES_EMAIL 3
#define RTCP_SDES_PHONE 4
#define RTCP_SDES_LOC 5
#define RTCP_SDES_TOOL 6
#define RTCP_SDES_NOTE 7
#define RTCP_SDES_PRIV 8
struct rtp;
struct rtp *rtp_init(char *addr, u_int16 port, int ttl, double rtcp_bw, void (*callback)(struct rtp *session, rtp_event *e));
void rtp_recv(struct rtp *session, struct timeval *timeout, u_int32 curr_time);
int rtp_send_data(struct rtp *session, u_int32 ts, char pt, int m, int cc, u_int32 csrc[16],
char *data, int data_len, char *extn, int extn_len);
void rtp_send_ctrl(struct rtp *session, u_int32 ts);
void rtp_update(struct rtp *session);
u_int32 rtp_my_ssrc(struct rtp *session);
int rtp_add_csrc(struct rtp *session, u_int32 csrc);
int rtp_valid_ssrc(struct rtp *session, u_int32 ssrc);
int rtp_set_sdes(struct rtp *session, u_int32 ssrc, u_int8 type, char *value, int length);
char *rtp_get_sdes(struct rtp *session, u_int32 ssrc, u_int8 type);
rtcp_sr *rtp_get_sr(struct rtp *session, u_int32 ssrc);
rtcp_rr *rtp_get_rr(struct rtp *session, u_int32 reporter, u_int32 reportee);
void rtp_send_bye(struct rtp *session);
int rtp_sent_bye(struct rtp *session);
void rtp_done(struct rtp *session);
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