rtp.h

一个关于 RTP的例子

/*******
 *
 * FILE INFO:
 * project:	RTP_lib
 * file:	RTP.h
 * started on:	03/26/03
 * started by:	Cedric Lacroix <[e-mail]>
 *
 *
 * TODO:
 *
 * BUGS:
 *
 * UPDATE INFO:
 * updated on:	05/14/03 21:33:46
 * updated by:	Julien Dupasquier <[e-mail]>
 *
 *******/

#ifndef RTP_H
#define RTP_H

#include 		"Types.h"
#include 		"Network.h"




/****************************************/
/****                                ****/
/****         STRUCTURES             ****/
/****                                ****/
/****************************************/


/**
 ** Contributor list
 **/
typedef struct   contributor
{
	u_int32		ssrc;           	/* SSRC for this contributor */
  	struct contributor *next;			/* Next contributor */
} contributor_t;



/**
 ** RTP header body
 **/
typedef struct
{
  	u_int8		flags;			/* Version(2),Padding(1), Ext(1), Cc(4) */
  	u_int8		mk_pt;			/* Marker(1), PlayLoad Type(7) */
  	u_int16		sq_nb;			/* Sequence Number */
  	u_int32		ts;			/* Timestamp */
  	u_int32		ssrc;			/* SSRC */
  	u_int32		*csrc;			/* CSRC's table */
} rtp_hdr;


/**
 ** RTP header extension
 **/
typedef struct
{
 	u_int16		ext_type;		/* Extension profile */
  	u_int16		ext_len;		/* Number of extensions */
  	u_int32		*hd_ext;		/* Extension's table */
} rtp_ext;


/**
 ** RTP Packet
 **/
typedef struct
{
  	rtp_hdr		*RTP_header;		/* Header RTP */
  	rtp_ext 	*RTP_extension;		/* extension of the header if exist */
  	char		*payload;		/* payload portion of RTP packet */
  	long		payload_len;        	/* The length of the payload */
} rtp_pkt;


/**
 ** RTP Context body
 **/
typedef struct
{
	int		context_num;		/* Context number - send/receive */
	u_int32		my_ssrc;		/* SSRC number - send/receive */
	u_int32		sending_pkt_count;	/* Number of packets sent - send/receive */
	u_int32		sending_octet_count;	/* Number of bytes sent - send/receive */
	u_int8		version;		/* Version - receive */
	u_int8		marker;			/* Marker flag - receive */
	u_int8		padding;		/* Padding length - receive */
	u_int8		CSRClen;		/* CSRC length - send/receive */
	u_int8		pt;			/* Payload type - send/receive */
	u_int32		*CSRCList;		/* CSRC list - send/receive */
	u_int32		my_previous_ssrc;	/* actually unused */
	u_int32		init_RTP_timestamp;	/* First value of timestamp - send/receive */
	u_int32		RTP_timestamp;		/* current value of timestamp - receive */
	u_int32		time_elapsed;		/* Time elapsed since the beginning - send/receive */
	u_int16		init_seq_no;		/* First sequence number - send/receive */
	u_int16		seq_no;			/* Current sequence number - send/receive */
	rtp_ext 	*hdr_extension;		/* Extension header - send/receive */
	void		*conx_data;		/* Network data */
} sess_context_t;

/****************************************/
/****                                ****/
/****         VARIABLE GLOBAL        ****/
/****                                ****/
/****************************************/

sess_context_t		**context_list;

#endif /* RTP_H */