rtp.h

目前的流媒体服务器代码有Darwin(苹果公司）

/* * 
 *  $Id$
 *  
 *  This file is part of Fenice
 *
 *  Fenice -- Open Media Server
 *
 *  Copyright (C) 2007 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 <netembryo/wsocket.h>
#include <fenice/mediathread.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 _RTP_transport {
    Sock *rtp_sock;
    Sock *rtcp_sock;
    struct sockaddr_storage last_stg;
    uint16 rtp_ch, rtcp_ch;
} 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 now back here
    double start_time;

    double prev_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;
    unsigned char started;

    unsigned int seq;
    unsigned int ssrc;

    char sd_filename[255];

    //mediathread - TODO: find better placement
    Selector *track_selector;

    //Consumer has transferred itself here
    OMSConsumer *cons;
    RTCP_stats rtcp_stats[2];    //client and server
    struct _RTP_session *next;
    unsigned char is_multicast_dad;    /*! if is it a 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);

/**
 * @defgroup RTP
 * @{
 */

/** 
 * RTP ports management functions
 * @defgroup rtp_port RTP ports management functions
 * @{
 */

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

/**
 * @}
 */

/** 
 * RTP session management functions
 * @defgroup rtp_session RTP session management functions
 * @{
 */

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_recv(RTP_session *, rtp_protos);

/**
 * @}
 */

/**
 * @}
 */

#endif