include/ortp/rtpsession.h

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 /*
  The oRTP library is an RTP (Realtime Transport Protocol - rfc3550) stack.
  Copyright (C) 2001  Simon MORLAT simon.morlat@linphone.org

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef RTPSESSION_H
#define RTPSESSION_H


#include <ortp/port.h>
#include <ortp/rtp.h>
#include <ortp/payloadtype.h>
#include <ortp/sessionset.h>
#include <ortp/rtcp.h>
#include <ortp/str_utils.h>
#include <ortp/rtpsignaltable.h>
#include <ortp/event.h>



typedef enum {
        RTP_SESSION_RECVONLY,
        RTP_SESSION_SENDONLY,
        RTP_SESSION_SENDRECV
} RtpSessionMode;


typedef struct _JBParameters{
        int min_size; 
        int nom_size; 
        int max_size; 
        bool_t adaptive;
        bool_t pad[3];
        int max_packets; 
} JBParameters;

typedef struct _JitterControl
{
        int count;
        int jitt_comp;   /* the user jitt_comp in miliseconds*/
        int jitt_comp_ts; /* the jitt_comp converted in rtp time (same unit as timestamp) */
        int adapt_jitt_comp_ts;
        int64_t slide;
        int64_t prev_slide;
        float jitter;
        int olddiff;
        float inter_jitter;     /* interarrival jitter as defined in the RFC */
        int corrective_step;
        int corrective_slide;
        bool_t adaptive;
        bool_t enabled;
} JitterControl;

typedef struct _WaitPoint
{
        ortp_mutex_t lock;
        ortp_cond_t  cond;
        uint32_t time;
        bool_t wakeup;
} WaitPoint;

typedef struct _RtpTransport
{
        void *data;
        ortp_socket_t (*t_getsocket)(struct _RtpTransport *t);
        int  (*t_sendto)(struct _RtpTransport *t, mblk_t *msg , int flags, const struct sockaddr *to, socklen_t tolen);
        int  (*t_recvfrom)(struct _RtpTransport *t, mblk_t *msg, int flags, struct sockaddr *from, socklen_t *fromlen);
        struct _RtpSession *session;//<back pointer to the owning session, set by oRTP
}  RtpTransport;


        
typedef struct _RtpStream
{
        //RTSP Over HTTP
        ortp_socket_t outSocket;
        ortp_socket_t socket;
        struct _RtpTransport *tr; 
        int sockfamily;
        int max_rq_size;
        int time_jump;
        uint32_t ts_jump;
        queue_t rq;
        queue_t tev_rq;
        mblk_t *cached_mp;
        int loc_port;
#ifdef ORTP_INET6
        struct sockaddr_storage rem_addr;
#else
        struct sockaddr_in rem_addr;
#endif
        int rem_addrlen;
        JitterControl jittctl;
        uint32_t snd_time_offset;/*the scheduler time when the application send its first timestamp*/   
        uint32_t snd_ts_offset; /* the first application timestamp sent by the application */
        uint32_t snd_rand_offset;       /* a random number added to the user offset to make the stream timestamp*/
        uint32_t snd_last_ts;   /* the last stream timestamp sended */
        uint32_t rcv_time_offset; /*the scheduler time when the application ask for its first timestamp*/
        uint32_t rcv_ts_offset;  /* the first stream timestamp */
        uint32_t rcv_query_ts_offset;   /* the first user timestamp asked by the application */
        uint32_t rcv_last_ts;   /* the last stream timestamp got by the application */
        uint32_t rcv_last_app_ts; /* the last application timestamp asked by the application */ 
        uint32_t rcv_last_ret_ts; /* the timestamp of the last sample returned (only for continuous audio)*/
        uint32_t hwrcv_extseq; /* last received on socket extended sequence number */
        uint32_t hwrcv_seq_at_last_SR;
        uint32_t hwrcv_since_last_SR;
        uint32_t last_rcv_SR_ts;     /* NTP timestamp (middle 32 bits) of last received SR */
        struct timeval last_rcv_SR_time;   /* time at which last SR was received  */
        uint16_t snd_seq; /* send sequence number */
        uint32_t last_rtcp_report_snt_r;        /* the time of the last rtcp report sent, in recv timestamp unit */
        uint32_t last_rtcp_report_snt_s;        /* the time of the last rtcp report sent, in send timestamp unit */
        uint32_t rtcp_report_snt_interval; /* the interval in timestamp unit between rtcp report sent */
        uint32_t last_rtcp_packet_count; /*the sender's octet count in the last sent RTCP SR*/
        uint32_t sent_payload_bytes; /*used for RTCP sender reports*/
        unsigned int sent_bytes; /* used for bandwidth estimation */
        struct timeval send_bw_start; /* used for bandwidth estimation */
        unsigned int recv_bytes; /* used for bandwidth estimation */
        struct timeval recv_bw_start; /* used for bandwidth estimation */
        rtp_stats_t stats;
        int recv_errno;
        int send_errno;
        int snd_socket_size;
        int rcv_socket_size;
}RtpStream;

typedef struct _RtcpStream
{
        //RTSP Over HTTP
        ortp_socket_t outSocket;
        ortp_socket_t socket;
        int sockfamily;
        struct _RtpTransport *tr; 

        mblk_t *cached_mp;
#ifdef ORTP_INET6
        struct sockaddr_storage rem_addr;
#else
        struct sockaddr_in rem_addr;
#endif
        int rem_addrlen;
        bool_t enabled; /*tells whether we can send RTCP packets */
} RtcpStream;

typedef struct _RtpSession RtpSession;


struct _RtpSession
{
        RtpSession *next;       /* next RtpSession, when the session are enqueued by the scheduler */
        int mask_pos;   /* the position in the scheduler mask of RtpSession : do not move this field: it is part of the ABI since the session_set macros use it*/
        struct {
          RtpProfile *profile;
          int pt;
          unsigned int ssrc;
          WaitPoint wp;
          int telephone_events_pt;      /* the payload type used for telephony events */
        } snd,rcv;
        unsigned int inc_ssrc_candidate;
        int inc_same_ssrc_count;
        int hw_recv_pt; /* recv payload type before jitter buffer */
        int recv_buf_size;
        RtpSignalTable on_ssrc_changed;
        RtpSignalTable on_payload_type_changed;
        RtpSignalTable on_telephone_event_packet;
        RtpSignalTable on_telephone_event;
        RtpSignalTable on_timestamp_jump;
        RtpSignalTable on_network_error;
        RtpSignalTable on_rtcp_bye;
        struct _OList *signal_tables;
        struct _OList *eventqs;
        msgb_allocator_t allocator;
        RtpStream rtp;
        RtcpStream rtcp;
        RtpSessionMode mode;
        struct _RtpScheduler *sched;
        uint32_t flags;
        int dscp;
        int multicast_ttl;
        int multicast_loopback;
        void * user_data;
        /* FIXME: Should be a table for all session participants. */
        struct timeval last_recv_time; /* Time of receiving the RTP/RTCP packet. */
        mblk_t *pending;
        /* telephony events extension */
        mblk_t *current_tev;            /* the pending telephony events */
        mblk_t *sd;
        queue_t contributing_sources;
        uint32_t rtcp_rcv_time_msw;
        uint8_t fraction_lost;
        bool_t symmetric_rtp;
        bool_t permissive; /*use the permissive algorithm*/
        bool_t use_connect; /* use connect() on the socket */
        bool_t ssrc_set;
};
        



#ifdef __cplusplus
extern "C"
{
#endif

/* public API */
RtpSession *rtp_session_new(int mode);
void rtp_session_set_scheduling_mode(RtpSession *session, int yesno);
void rtp_session_set_blocking_mode(RtpSession *session, int yesno);
void rtp_session_set_profile(RtpSession *session, RtpProfile *profile);
void rtp_session_set_send_profile(RtpSession *session,RtpProfile *profile);
void rtp_session_set_recv_profile(RtpSession *session,RtpProfile *profile);
RtpProfile *rtp_session_get_profile(RtpSession *session);
RtpProfile *rtp_session_get_send_profile(RtpSession *session);
RtpProfile *rtp_session_get_recv_profile(RtpSession *session);
int rtp_session_signal_connect(RtpSession *session,const char *signal_name, RtpCallback cb, unsigned long user_data);
int rtp_session_signal_disconnect_by_callback(RtpSession *session,const char *signal_name, RtpCallback cb);
void rtp_session_set_ssrc(RtpSession *session, uint32_t ssrc);
void rtp_session_set_seq_number(RtpSession *session, uint16_t seq);
uint16_t rtp_session_get_seq_number(RtpSession *session);

void rtp_session_enable_jitter_buffer(RtpSession *session , bool_t enabled);
bool_t rtp_session_jitter_buffer_enabled(const RtpSession *session);
void rtp_session_set_jitter_buffer_params(RtpSession *session, const JBParameters *par);
void rtp_session_get_jitter_buffer_params(RtpSession *session, JBParameters *par);

/*deprecated jitter control functions*/
void rtp_session_set_jitter_compensation(RtpSession *session, int milisec);
void rtp_session_enable_adaptive_jitter_compensation(RtpSession *session, bool_t val);
bool_t rtp_session_adaptive_jitter_compensation_enabled(RtpSession *session);

void rtp_session_set_time_jump_limit(RtpSession *session, int miliseconds);
int rtp_session_set_local_addr(RtpSession *session,const char *addr, int port);
int rtp_session_get_local_port(const RtpSession *session);

int
rtp_session_set_remote_addr_full (RtpSession * session, const char * addr, int rtp_port, int rtcp_port);
/*same as previous function, old name:*/
int rtp_session_set_remote_addr_and_port (RtpSession * session, const char * addr, int rtp_port, int rtcp_port);
int rtp_session_set_remote_addr(RtpSession *session,const char *addr, int port);
/* alternatively to the set_remote_addr() and set_local_addr(), an application can give
a valid socket (potentially connect()ed )to be used by the RtpSession */
void rtp_session_set_sockets(RtpSession *session, int rtpfd, int rtcpfd);
void rtp_session_set_http_sockets(RtpSession *session, int inSock, int outSock);
void rtp_session_set_transports(RtpSession *session, RtpTransport *rtptr, RtpTransport *rtcptr);

/*those methods are provided for people who wants to send non-RTP messages using the RTP/RTCP sockets */
ortp_socket_t rtp_session_get_rtp_socket(const RtpSession *session);
ortp_socket_t rtp_session_get_rtcp_socket(const RtpSession *session);


/* QOS / DSCP */
int rtp_session_set_dscp(RtpSession *session, int dscp);
int rtp_session_get_dscp(const RtpSession *session);


/* Multicast methods */
int rtp_session_set_multicast_ttl(RtpSession *session, int ttl);
int rtp_session_get_multicast_ttl(RtpSession *session);

int rtp_session_set_multicast_loopback(RtpSession *session, int yesno);
int rtp_session_get_multicast_loopback(RtpSession *session);



int rtp_session_set_send_payload_type(RtpSession *session, int paytype);
int rtp_session_get_send_payload_type(const RtpSession *session);

int rtp_session_get_recv_payload_type(const RtpSession *session);
int rtp_session_set_recv_payload_type(RtpSession *session, int pt);

int rtp_session_set_payload_type(RtpSession *session, int pt);

void rtp_session_set_symmetric_rtp (RtpSession * session, bool_t yesno);

void rtp_session_set_connected_mode(RtpSession *session, bool_t yesno);

void rtp_session_enable_rtcp(RtpSession *session, bool_t yesno);

/*low level recv and send functions */
mblk_t * rtp_session_recvm_with_ts (RtpSession * session, uint32_t user_ts);
mblk_t * rtp_session_create_packet(RtpSession *session,int header_size, const uint8_t *payload, int payload_size, int marker);
mblk_t * rtp_session_create_packet_with_data(RtpSession *session, uint8_t *payload, int payload_size, void (*freefn)(void*));
mblk_t * rtp_session_create_packet_in_place(RtpSession *session,uint8_t *buffer, int size, void (*freefn)(void*) );
int rtp_session_sendm_with_ts (RtpSession * session, mblk_t *mp, uint32_t userts);
/* high level recv and send functions */
int rtp_session_recv_with_ts(RtpSession *session, uint8_t *buffer, int len, uint32_t ts, int *have_more);
int rtp_session_send_with_ts(RtpSession *session, const uint8_t *buffer, int len, uint32_t userts, int marker);

/* event API*/
void rtp_session_register_event_queue(RtpSession *session, OrtpEvQueue *q);
void rtp_session_unregister_event_queue(RtpSession *session, OrtpEvQueue *q);


/* IP bandwidth usage estimation functions, returning bits/s*/
float rtp_session_compute_send_bandwidth(RtpSession *session);
float rtp_session_compute_recv_bandwidth(RtpSession *session);

void rtp_session_send_rtcp_APP(RtpSession *session, uint8_t subtype, const char *name, const uint8_t *data, int datalen);

uint32_t rtp_session_get_current_send_ts(RtpSession *session);
uint32_t rtp_session_get_current_recv_ts(RtpSession *session);
void rtp_session_flush_sockets(RtpSession *session);
void rtp_session_release_sockets(RtpSession *session);
void rtp_session_resync(RtpSession *session);
void rtp_session_reset(RtpSession *session);
void rtp_session_destroy(RtpSession *session);

const rtp_stats_t * rtp_session_get_stats(const RtpSession *session);
void rtp_session_reset_stats(RtpSession *session);

void rtp_session_set_data(RtpSession *session, void *data);
void *rtp_session_get_data(const RtpSession *session);

void rtp_session_set_recv_buf_size(RtpSession *session, int bufsize);
void rtp_session_set_rtp_socket_send_buffer_size(RtpSession * session, unsigned int size);
void rtp_session_set_rtp_socket_recv_buffer_size(RtpSession * session, unsigned int size);

/* in use with the scheduler to convert a timestamp in scheduler time unit (ms) */
uint32_t rtp_session_ts_to_time(RtpSession *session,uint32_t timestamp);
uint32_t rtp_session_time_to_ts(RtpSession *session, int millisecs);
/* this function aims at simulating senders with "imprecise" clocks, resulting in 
rtp packets sent with timestamp uncorrelated with the system clock .
This is only availlable to sessions working with the oRTP scheduler */
void rtp_session_make_time_distorsion(RtpSession *session, int milisec);

/*RTCP functions */
void rtp_session_set_source_description(RtpSession *session, const char *cname,
        const char *name, const char *email, const char *phone, 
    const char *loc, const char *tool, const char *note);
void rtp_session_add_contributing_source(RtpSession *session, uint32_t csrc, 
    const char *cname, const char *name, const char *email, const char *phone, 
    const char *loc, const char *tool, const char *note);
void rtp_session_remove_contributing_sources(RtpSession *session, uint32_t csrc);
mblk_t* rtp_session_create_rtcp_sdes_packet(RtpSession *session);

void rtp_session_get_last_recv_time(RtpSession *session, struct timeval *tv);
int rtp_session_bye(RtpSession *session, const char *reason);

int rtp_session_get_last_send_error_code(RtpSession *session);
void rtp_session_clear_send_error_code(RtpSession *session);
int rtp_session_get_last_recv_error_code(RtpSession *session);
void rtp_session_clear_recv_error_code(RtpSession *session);

/*private */
void rtp_session_init(RtpSession *session, int mode);
#define rtp_session_set_flag(session,flag) (session)->flags|=(flag)
#define rtp_session_unset_flag(session,flag) (session)->flags&=~(flag)
void rtp_session_uninit(RtpSession *session);

#ifdef __cplusplus
}
#endif

#endif