rtp.h

最新版本的开源流媒体服务器

/* * 
 *  $Id: rtp.h 395 2006-10-05 16:08:10Z shawill $
 *  
 *  This file is part of Fenice
 *
 *  Fenice -- Open Media Server
 *
 *  Copyright (C) 2004 by
 *  	
 *	- Giampaolo Mancini	<[e-mail]>
 *	- Francesco Varano	<[e-mail]>
 *	- Marco Penno		<[e-mail]>
 *	- Federico Ridolfo	<[e-mail]>
 *	- Eugenio Menegatti 	<[e-mail]>
 *	- Stefano Cau
 *	- Giuliano Emma
 *	- Stefano Oldrini
 *	- Dario Gallucci	<[e-mail]>
 * 
 *  Fenice is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Fenice is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Fenice; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *  
 * */

#ifndef _RTPH
#define _RTPH

#include <time.h>
#include <sys/timeb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <fenice/socket.h>
#include <fenice/mediainfo.h>
#include <fenice/bufferpool.h>
#include <fenice/types.h>
#include <fenice/prefs.h>
#define RTP_DEFAULT_PORT 5004
#define RTCP_BUFFERSIZE	1024

typedef enum {
	i_server = 0,
	i_client = 1
} rtcp_index;

typedef struct {
	int RTP;
	int RTCP;
} port_pair;

typedef enum {
	rtp_proto = 0,
	rtcp_proto
} rtp_protos;

typedef struct {
	uint16 RTP;
	uint16 RTCP;
} stream_pair;

typedef struct _RTP_transport {
	enum {
		RTP_no_transport = 0,
		RTP_rtp_avp,
		RTP_rtp_avp_tcp,
		RTP_rtp_avp_sctp
	} type;
	tsocket rtp_fd;
	tsocket rtcp_fd_out;
	tsocket rtcp_fd_in;
	union {
		struct {
			struct sockaddr rtp_peer;
			struct sockaddr rtcp_in_peer;
			struct sockaddr rtcp_out_peer;
			port_pair cli_ports;
			port_pair ser_ports;
			unsigned char is_multicast;
		} udp;
		struct {
			stream_pair interleaved;
		} tcp;
		struct {
			stream_pair streams;
		} sctp;
		// other trasports here
	} u;
} RTP_transport;

typedef struct _RTCP_stats {
	unsigned int RR_received;
	unsigned int SR_received;
	unsigned long dest_SSRC;
	unsigned int pkt_count;
	unsigned int octet_count;
	int pkt_lost;
	unsigned char fract_lost;
	unsigned int highest_seq_no;
	unsigned int jitter;
	unsigned int last_SR;
	unsigned int delay_since_last_SR;
} RTCP_stats;

typedef struct _RTP_session {
	RTP_transport transport;
	unsigned char rtcp_inbuffer[RTCP_BUFFERSIZE];
	int rtcp_insize;
	unsigned char rtcp_outbuffer[RTCP_BUFFERSIZE];
	uint32 rtcp_outsize;
	/*      
	   //these time vars now are in media_entry structure
	   double mtime;
	   double mstart;
	   double mstart_offset; */

	double mprev_tx_time;
	unsigned int PreviousCount;
	short MinimumReached;
	short MaximumReached;
	// Back references
	int sched_id;
	unsigned int start_seq;

	unsigned int start_rtptime;

	unsigned char pause;
	//this var is in media_entry structure
	unsigned char started;

	unsigned int seq;
	unsigned int ssrc;
//              port_pair ser_ports;
//              port_pair cli_ports;
	char sd_filename[255];
	media_entry *current_media;
	SD_descr *sd_descr;

	//Consumer has transferred itself here
	OMSConsumer *cons;
	RTCP_stats rtcp_stats[2];	//client e server
	struct _RTP_session *next;
	unsigned char is_multicast_dad;	/*if is it an multicast son it cannot do TEARDOWN etc... */
} RTP_session;

typedef struct _RTP_header {
	/* byte 0 */
#if (BYTE_ORDER == LITTLE_ENDIAN)
	unsigned char csrc_len:4;	/* expect 0 */
	unsigned char extension:1;	/* expect 1, see RTP_OP below */
	unsigned char padding:1;	/* expect 0 */
	unsigned char version:2;	/* expect 2 */
#elif (BYTE_ORDER == BIG_ENDIAN)
	unsigned char version:2;
	unsigned char padding:1;
	unsigned char extension:1;
	unsigned char csrc_len:4;
#else
#error Neither big nor little
#endif
	/* byte 1 */
#if (BYTE_ORDER == LITTLE_ENDIAN)
	unsigned char payload:7;	/* RTP_PAYLOAD_RTSP */
	unsigned char marker:1;	/* expect 1 */
#elif (BYTE_ORDER == BIG_ENDIAN)
	unsigned char marker:1;
	unsigned char payload:7;
#endif
	/* bytes 2, 3 */
	unsigned short seq_no;
	/* bytes 4-7 */
	unsigned int timestamp;
	/* bytes 8-11 */
	unsigned int ssrc;	/* stream number is used here. */
} RTP_header;

typedef int (*RTP_play_action) (RTP_session * sess);

void RTP_port_pool_init(int port);
int RTP_get_port_pair(port_pair * pair);
int RTP_release_port_pair(port_pair * pair);

int RTP_send_packet(RTP_session * session);
RTP_session *RTP_session_destroy(RTP_session *);

	// RTP_transport functions
int RTP_transport_close(RTP_session *);
	// low-level sent/receive packet functions depending on transport settings.
ssize_t RTP_sendto(RTP_session *, rtp_protos, unsigned char *, ssize_t);
ssize_t RTP_recv(RTP_session *, rtp_protos);

#endif