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/*
* Copyright (c) 2004-2006 Maxim Sobolev <sobomax@FreeBSD.org>
* Copyright (c) 2006-2007 Sippy Software, Inc., http://www.sippysoft.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR 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.
*
* $Id: rtp.h,v 1.8 2008/04/17 22:38:00 sobomax Exp $
*
*/
#ifndef _RTP_H_
#define _RTP_H_
#include <sys/socket.h>
#include <sys/types.h>
/*
* RTP payload types
*/
typedef enum {
RTP_PCMU = 0,
RTP_GSM = 3,
RTP_G723 = 4,
RTP_PCMA = 8,
RTP_CN = 13,
RTP_G729 = 18,
RTP_TSE = 100,
RTP_TSE_CISCO = 101
} rtp_type_t;
#define RTP_NSAMPLES_UNKNOWN (-1)
/*
* RTP data header
*/
typedef struct {
#if BYTE_ORDER == BIG_ENDIAN
unsigned int version:2; /* protocol version */
unsigned int p:1; /* padding flag */
unsigned int x:1; /* header extension flag */
unsigned int cc:4; /* CSRC count */
unsigned int m:1; /* marker bit */
unsigned int pt:7; /* payload type */
#else
unsigned int cc:4; /* CSRC count */
unsigned int x:1; /* header extension flag */
unsigned int p:1; /* padding flag */
unsigned int version:2; /* protocol version */
unsigned int pt:7; /* payload type */
unsigned int m:1; /* marker bit */
#endif
unsigned int seq:16; /* sequence number */
uint32_t ts; /* timestamp */
uint32_t ssrc; /* synchronization source */
uint32_t csrc[0]; /* optional CSRC list */
} rtp_hdr_t;
struct rtp_packet {
size_t size;
struct sockaddr_storage raddr;
socklen_t rlen;
size_t data_size;
int data_offset;
int nsamples;
uint32_t ts;
uint16_t seq;
int appendable;
double rtime;
struct rtp_packet *next;
struct rtp_packet *prev;
/*
* The packet, keep it the last member so that we can use
* memcpy() only on portion that it's actually being
* utilized.
*/
union {
rtp_hdr_t header;
unsigned char buf[8192];
};
};
struct rtp_packet_chunk {
int bytes;
int nsamples;
int whole_packet_matched;
};
#define RTP_HDR_LEN(rhp) (sizeof(*(rhp)) + ((rhp)->cc * sizeof((rhp)->csrc[0])))
void rtp_packet_parse(struct rtp_packet *);
struct rtp_packet *rtp_recv(int);
struct rtp_packet *rtp_packet_alloc();
void rtp_packet_free(struct rtp_packet *);
void rtp_packet_set_seq(struct rtp_packet *, uint16_t seq);
void rtp_packet_set_ts(struct rtp_packet *, uint32_t ts);
void rtp_packet_first_chunk_find(struct rtp_packet *, struct rtp_packet_chunk *, int min_nsamples);
#define ts_less(ts1, ts2) (((ts1) - (ts2)) > (uint32_t) (1 << 31))
#endif
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