rtpsession.c 60.7 KB
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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
*/


#if defined(WIN32) || defined(_WIN32_WCE)
#include "ortp-config-win32.h"
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#elif HAVE_CONFIG_H
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#include "ortp-config.h"
#endif

#include "ortp/ortp.h"
#include "ortp/telephonyevents.h"
#include "ortp/rtcp.h"
#include "jitterctl.h"
#include "scheduler.h"
#include "utils.h"
#include "rtpsession_priv.h"

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#if (_WIN32_WINNT >= 0x0600)
#include <delayimp.h>
#undef ExternC /* avoid redefinition... */
#include <QOS2.h>
#endif

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extern mblk_t *rtcp_create_simple_bye_packet(uint32_t ssrc, const char *reason);
extern int rtcp_sr_init(RtpSession *session, char *buf, int size);
extern int rtcp_rr_init(RtpSession *session, char *buf, int size);



/* this function initialize all session parameter's that depend on the payload type */
static void payload_type_changed(RtpSession *session, PayloadType *pt){
	jitter_control_set_payload(&session->rtp.jittctl,pt);
	rtp_session_set_time_jump_limit(session,session->rtp.time_jump);
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	rtp_session_set_rtcp_report_interval(session,session->rtcp.interval);
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	if (pt->type==PAYLOAD_VIDEO){
		session->permissive=TRUE;
		ortp_message("Using permissive algorithm");
	}
	else session->permissive=FALSE;
}

void wait_point_init(WaitPoint *wp){
	ortp_mutex_init(&wp->lock,NULL);
	ortp_cond_init(&wp->cond,NULL);
	wp->time=0;
	wp->wakeup=FALSE;
}
void wait_point_uninit(WaitPoint *wp){
	ortp_cond_destroy(&wp->cond);
	ortp_mutex_destroy(&wp->lock);
}

#define wait_point_lock(wp) ortp_mutex_lock(&(wp)->lock)
#define wait_point_unlock(wp) ortp_mutex_unlock(&(wp)->lock)

void wait_point_wakeup_at(WaitPoint *wp, uint32_t t, bool_t dosleep){
	wp->time=t;
	wp->wakeup=TRUE;
	if (dosleep) ortp_cond_wait(&wp->cond,&wp->lock);
}


bool_t wait_point_check(WaitPoint *wp, uint32_t t){
	bool_t ok=FALSE;
	
	if (wp->wakeup){
		if (TIME_IS_NEWER_THAN(t,wp->time)){
			wp->wakeup=FALSE;
			ok=TRUE;
			
		}
	}
	return ok;
}
#define wait_point_wakeup(wp) ortp_cond_signal(&(wp)->cond);

extern void rtp_parse(RtpSession *session, mblk_t *mp, uint32_t local_str_ts,
		struct sockaddr *addr, socklen_t addrlen);


static uint32_t uint32_t_random(){
	return random();
}


#define RTP_SEQ_IS_GREATER(seq1,seq2)\
	((uint16_t)((uint16_t)(seq1) - (uint16_t)(seq2))< (uint16_t)(1<<15))

/* put an rtp packet in queue. It is called by rtp_parse()*/
void rtp_putq(queue_t *q, mblk_t *mp)
{
	mblk_t *tmp;
	rtp_header_t *rtp=(rtp_header_t*)mp->b_rptr,*tmprtp;
	/* insert message block by increasing time stamp order : the last (at the bottom)
		message of the queue is the newest*/
	ortp_debug("rtp_putq(): Enqueuing packet with ts=%i and seq=%i",rtp->timestamp,rtp->seq_number);
	
	if (qempty(q)) {
		putq(q,mp);
		return;
	}
	tmp=qlast(q);
	/* we look at the queue from bottom to top, because enqueued packets have a better chance
	to be enqueued at the bottom, since there are surely newer */
	while (!qend(q,tmp))
	{
		tmprtp=(rtp_header_t*)tmp->b_rptr;
		ortp_debug("rtp_putq(): Seeing packet with seq=%i",tmprtp->seq_number);
		
 		if (rtp->seq_number == tmprtp->seq_number)
 		{
 			/* this is a duplicated packet. Don't queue it */
 			ortp_debug("rtp_putq: duplicated message.");
 			freemsg(mp);
 			return;
		}else if (RTP_SEQ_IS_GREATER(rtp->seq_number,tmprtp->seq_number)){
			
			insq(q,tmp->b_next,mp);
			return;
 		}
		tmp=tmp->b_prev;
	}
	/* this packet is the oldest, it has to be 
	placed on top of the queue */
	insq(q,qfirst(q),mp);
	
}



mblk_t *rtp_getq(queue_t *q,uint32_t timestamp, int *rejected)
{
	mblk_t *tmp,*ret=NULL,*old=NULL;
	rtp_header_t *tmprtp;
	uint32_t ts_found=0;
	
	*rejected=0;
	ortp_debug("rtp_getq(): Timestamp %i wanted.",timestamp);

	if (qempty(q))
	{
		/*ortp_debug("rtp_getq: q is empty.");*/
		return NULL;
	}
	/* return the packet with ts just equal or older than the asked timestamp */
	/* packets with older timestamps are discarded */
	while ((tmp=qfirst(q))!=NULL)
	{
		tmprtp=(rtp_header_t*)tmp->b_rptr;
		ortp_debug("rtp_getq: Seeing packet with ts=%i",tmprtp->timestamp);
		if ( RTP_TIMESTAMP_IS_NEWER_THAN(timestamp,tmprtp->timestamp) )
		{
			if (ret!=NULL && tmprtp->timestamp==ts_found) {
				/* we've found two packets with same timestamp. return the first one */
				break;
			}
			if (old!=NULL) {
				ortp_debug("rtp_getq: discarding too old packet with ts=%i",ts_found);
				(*rejected)++;
				freemsg(old);
			}
			ret=getq(q); /* dequeue the packet, since it has an interesting timestamp*/
			ts_found=tmprtp->timestamp;
			ortp_debug("rtp_getq: Found packet with ts=%i",tmprtp->timestamp);
			old=ret;
		}
		else
		{
			break;
		}
	}
	return ret;
}

mblk_t *rtp_getq_permissive(queue_t *q,uint32_t timestamp, int *rejected)
{
	mblk_t *tmp,*ret=NULL;
	rtp_header_t *tmprtp;
	
	*rejected=0;
	ortp_debug("rtp_getq_permissive(): Timestamp %i wanted.",timestamp);

	if (qempty(q))
	{
		/*ortp_debug("rtp_getq: q is empty.");*/
		return NULL;
	}
	/* return the packet with the older timestamp (provided that it is older than
	the asked timestamp) */
	tmp=qfirst(q);
	tmprtp=(rtp_header_t*)tmp->b_rptr;
	ortp_debug("rtp_getq_permissive: Seeing packet with ts=%i",tmprtp->timestamp);
	if ( RTP_TIMESTAMP_IS_NEWER_THAN(timestamp,tmprtp->timestamp) )
	{
		ret=getq(q); /* dequeue the packet, since it has an interesting timestamp*/
		ortp_debug("rtp_getq_permissive: Found packet with ts=%i",tmprtp->timestamp);
	}
	return ret;
}


void
rtp_session_init (RtpSession * session, int mode)
{
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	JBParameters jbp;
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	if (session == NULL) 
	{
	    ortp_debug("rtp_session_init: Invalid paramter (session=NULL)");
	    return;
	}
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	memset (session, 0, sizeof (RtpSession));
	session->mode = (RtpSessionMode) mode;
	if ((mode == RTP_SESSION_RECVONLY) || (mode == RTP_SESSION_SENDRECV))
	{
		rtp_session_set_flag (session, RTP_SESSION_RECV_SYNC);
		rtp_session_set_flag (session, RTP_SESSION_RECV_NOT_STARTED);
		
	}
	if ((mode == RTP_SESSION_SENDONLY) || (mode == RTP_SESSION_SENDRECV))
	{
		rtp_session_set_flag (session, RTP_SESSION_SEND_NOT_STARTED);
		session->snd.ssrc=uint32_t_random();
		/* set default source description */
		rtp_session_set_source_description(session,"unknown@unknown",NULL,NULL,
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				NULL,NULL,"oRTP-" ORTP_VERSION,NULL);
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	}
	session->snd.telephone_events_pt=-1;	/* not defined a priori */
	session->rcv.telephone_events_pt=-1;	/* not defined a priori */
	rtp_session_set_profile (session, &av_profile); /*the default profile to work with */
	session->rtp.socket=-1;
	session->rtcp.socket=-1;
#ifndef WIN32
	session->rtp.snd_socket_size=0;	/*use OS default value unless on windows where they are definitely too short*/
	session->rtp.rcv_socket_size=0;
#else
	session->rtp.snd_socket_size=session->rtp.rcv_socket_size=65536;
#endif
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	session->rtp.ssrc_changed_thres=50;
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	session->dscp=RTP_DEFAULT_DSCP;
	session->multicast_ttl=RTP_DEFAULT_MULTICAST_TTL;
	session->multicast_loopback=RTP_DEFAULT_MULTICAST_LOOPBACK;
	qinit(&session->rtp.rq);
	qinit(&session->rtp.tev_rq);
	qinit(&session->contributing_sources);
	session->eventqs=NULL;
	/* init signal tables */
	rtp_signal_table_init (&session->on_ssrc_changed, session,"ssrc_changed");
	rtp_signal_table_init (&session->on_payload_type_changed, session,"payload_type_changed");
	rtp_signal_table_init (&session->on_telephone_event, session,"telephone-event");
	rtp_signal_table_init (&session->on_telephone_event_packet, session,"telephone-event_packet");
	rtp_signal_table_init (&session->on_timestamp_jump,session,"timestamp_jump");
	rtp_signal_table_init (&session->on_network_error,session,"network_error");
	rtp_signal_table_init (&session->on_rtcp_bye,session,"rtcp_bye");
	wait_point_init(&session->snd.wp);
	wait_point_init(&session->rcv.wp);
	/*defaults send payload type to 0 (pcmu)*/
	rtp_session_set_send_payload_type(session,0);
	/*sets supposed recv payload type to undefined */
	rtp_session_set_recv_payload_type(session,-1);
	/* configure jitter buffer with working default parameters */
	jbp.min_size=RTP_DEFAULT_JITTER_TIME;
	jbp.nom_size=RTP_DEFAULT_JITTER_TIME;
	jbp.max_size=-1;
	jbp.max_packets= 100;/* maximum number of packet allowed to be queued */
	jbp.adaptive=TRUE;
	rtp_session_enable_jitter_buffer(session,TRUE);
	rtp_session_set_jitter_buffer_params(session,&jbp);
	rtp_session_set_time_jump_limit(session,5000);
	rtp_session_enable_rtcp(session,TRUE);
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	rtp_session_set_rtcp_report_interval(session,RTCP_DEFAULT_REPORT_INTERVAL);
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	session->recv_buf_size = UDP_MAX_SIZE;
	session->symmetric_rtp = FALSE;
	session->permissive=FALSE;
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	session->reuseaddr=TRUE;
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	msgb_allocator_init(&session->allocator);
}


/**
 * Creates a new rtp session.
 * If the session is able to send data (RTP_SESSION_SENDONLY or
 * RTP_SESSION_SENDRECV), then a random SSRC number is choosed for 
 * the outgoing stream.
 * @param mode One of the RtpSessionMode flags.	
 *
 * @return the newly created rtp session.
**/
RtpSession *
rtp_session_new (int mode)
{
	RtpSession *session;
	session = (RtpSession *) ortp_malloc (sizeof (RtpSession));
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	if (session == NULL)
	{
	    ortp_error("rtp_session_new: Memory allocation failed");
	    return NULL;
	}
      rtp_session_init (session, mode);
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	return session;
}

/**
 * Sets the scheduling mode of the rtp session. If @yesno is TRUE, the rtp session is in
 *	the scheduled mode, that means that you can use session_set_select() to block until it's time
 *	to receive or send on this session according to the timestamp passed to the respective functions.
 *  You can also use blocking mode (see rtp_session_set_blocking_mode() ), to simply block within
 *	the receive and send functions.
 *	If @yesno is FALSE, the ortp scheduler will not manage those sessions, meaning that blocking mode 
 *  and the use of session_set_select() for this session are disabled.
 *@param session a rtp session.
 *@param yesno 	a boolean to indicate the scheduling mode.
 *
 *
**/
void
rtp_session_set_scheduling_mode (RtpSession * session, int yesno)
{
	if (yesno)
	{
		RtpScheduler *sched;
		sched = ortp_get_scheduler ();
		if (sched != NULL)
		{
			rtp_session_set_flag (session, RTP_SESSION_SCHEDULED);
			session->sched = sched;
			rtp_scheduler_add_session (sched, session);
		}
		else
			ortp_warning
				("rtp_session_set_scheduling_mode: Cannot use scheduled mode because the "
				 "scheduler is not started. Use ortp_scheduler_init() before.");
	}
	else
		rtp_session_unset_flag (session, RTP_SESSION_SCHEDULED);
}


/**
 *	This function implicitely enables the scheduling mode if yesno is TRUE.
 *	rtp_session_set_blocking_mode() defines the behaviour of the rtp_session_recv_with_ts() and 
 *	rtp_session_send_with_ts() functions. If @yesno is TRUE, rtp_session_recv_with_ts()
 *	will block until it is time for the packet to be received, according to the timestamp
 *	passed to the function. After this time, the function returns.
 *	For rtp_session_send_with_ts(), it will block until it is time for the packet to be sent.
 *	If @yesno is FALSE, then the two functions will return immediately.
 *
 *  @param session a rtp session
 *  @param yesno a boolean
**/
void
rtp_session_set_blocking_mode (RtpSession * session, int yesno)
{
	if (yesno){
		rtp_session_set_scheduling_mode(session,TRUE);
		rtp_session_set_flag (session, RTP_SESSION_BLOCKING_MODE);
	}else
		rtp_session_unset_flag (session, RTP_SESSION_BLOCKING_MODE);
}

/**
 *	Set the RTP profile to be used for the session. By default, all session are created by
 *	rtp_session_new() are initialized with the AV profile, as defined in RFC 3551. The application
 *	can set any other profile instead using that function.
 *
 * @param session a rtp session
 * @param profile a rtp profile
**/

void
rtp_session_set_profile (RtpSession * session, RtpProfile * profile)
{
	session->snd.profile = profile;
	session->rcv.profile = profile;
	rtp_session_telephone_events_supported(session);
}

/**
 *	By default oRTP automatically sends RTCP SR or RR packets. If
 *	yesno is set to FALSE, the RTCP sending of packet is disabled.
 *	This functionnality might be needed for some equipments that do not
 *	support RTCP, leading to a traffic of ICMP errors on the network.
 *	It can also be used to save bandwidth despite the RTCP bandwidth is 
 *	actually and usually very very low.
**/
void rtp_session_enable_rtcp(RtpSession *session, bool_t yesno){
	session->rtcp.enabled=yesno;
}

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/**
 * Sets the default interval in milliseconds for RTCP reports emitted by the session
 *
**/
void rtp_session_set_rtcp_report_interval(RtpSession *session, int value_ms){
	int recvpt=rtp_session_get_recv_payload_type(session);
	int sendpt=rtp_session_get_send_payload_type(session);
	if (recvpt!=-1){
		PayloadType *pt=rtp_profile_get_payload(session->rcv.profile,recvpt);
		if (pt!=NULL){
			session->rtcp.rtcp_report_snt_interval_r=(value_ms*pt->clock_rate)/1000;
		}
	}
	if (sendpt!=-1){
		PayloadType *pt=rtp_profile_get_payload(session->snd.profile,sendpt);
		if (pt!=NULL){
			session->rtcp.rtcp_report_snt_interval_s=(value_ms*pt->clock_rate)/1000;
		}
	}
	session->rtcp.interval=value_ms;
}

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/**
 *	Set the RTP profile to be used for the sending by this session. By default, all session are created by
 *	rtp_session_new() are initialized with the AV profile, as defined in RFC 3551. The application
 *	can set any other profile instead using that function.
 * @param session a rtp session
 * @param profile a rtp profile
 *
**/

void
rtp_session_set_send_profile (RtpSession * session, RtpProfile * profile)
{
	session->snd.profile = profile;
	rtp_session_send_telephone_events_supported(session);
}



/**
 *	Set the RTP profile to be used for the receiveing by this session. By default, all session are created by
 *	rtp_session_new() are initialized with the AV profile, as defined in RFC 3551. The application
 *	can set any other profile instead using that function.
 *
 * @param session a rtp session
 * @param profile a rtp profile
**/

void
rtp_session_set_recv_profile (RtpSession * session, RtpProfile * profile)
{
	session->rcv.profile = profile;
	rtp_session_recv_telephone_events_supported(session);
}

/**
 *@param session a rtp session
 *
 *	DEPRECATED! Returns current send profile.
 *	Use rtp_session_get_send_profile() or rtp_session_get_recv_profile()
 *
**/
RtpProfile *rtp_session_get_profile(RtpSession *session){
	return session->snd.profile;
}


/**
 *@param session a rtp session
 *
 *	Returns current send profile.
 *
**/
RtpProfile *rtp_session_get_send_profile(RtpSession *session){
	return session->snd.profile;
}

/**
 *@param session a rtp session
 *
 *	Returns current receive profile.
 *
**/
RtpProfile *rtp_session_get_recv_profile(RtpSession *session){
	return session->rcv.profile;
}

/**
 *	The default value is UDP_MAX_SIZE bytes, a value which is working for mostly everyone.
 *	However if your application can make assumption on the sizes of received packet,
 *	it can be interesting to set it to a lower value in order to save memory.
 *
 * @param session a rtp session
 * @param bufsize max size in bytes for receiving packets
**/
void rtp_session_set_recv_buf_size(RtpSession *session, int bufsize){
	session->recv_buf_size=bufsize;
}

/**
 *	Set kernel send maximum buffer size for the rtp socket.
 *	A value of zero defaults to the operating system default.
**/
void rtp_session_set_rtp_socket_send_buffer_size(RtpSession * session, unsigned int size){
	session->rtp.snd_socket_size=size;
}

/**
 *	Set kernel recv maximum buffer size for the rtp socket.
 *	A value of zero defaults to the operating system default.
**/
void rtp_session_set_rtp_socket_recv_buffer_size(RtpSession * session, unsigned int size){
	session->rtp.rcv_socket_size=size;
}

/**
 *	This function provides the way for an application to be informed of various events that
 *	may occur during a rtp session. @signal is a string identifying the event, and @cb is 
 *	a user supplied function in charge of processing it. The application can register
 *	several callbacks for the same signal, in the limit of #RTP_CALLBACK_TABLE_MAX_ENTRIES.
 *	Here are name and meaning of supported signals types:
 *
 *	"ssrc_changed" : the SSRC of the incoming stream has changed.
 *
 *	"payload_type_changed" : the payload type of the incoming stream has changed.
 *
 *	"telephone-event_packet" : a telephone-event rtp packet (RFC2833) is received.
 *
 *	"telephone-event" : a telephone event has occured. This is a high-level shortcut for "telephone-event_packet".
 *
 *	"network_error" : a network error happened on a socket. Arguments of the callback functions are
 *						a const char * explaining the error, an int errno error code and the user_data as usual.
 *
 *	"timestamp_jump" : we have received a packet with timestamp in far future compared to last timestamp received.
 *						The farness of far future is set by rtp_sesssion_set_time_jump_limit()
 *  "rtcp_bye": we have received a RTCP bye packet. Arguments of the callback
 *              functions are a const char * containing the leaving reason and
 *              the user_data.
 * 
 *	Returns: 0 on success, -EOPNOTSUPP if the signal does not exists, -1 if no more callbacks
 *	can be assigned to the signal type.
 *
 * @param session 	a rtp session
 * @param signal_name	the name of a signal
 * @param cb		a RtpCallback
 * @param user_data	a pointer to any data to be passed when invoking the callback.
 *
**/
int
rtp_session_signal_connect (RtpSession * session, const char *signal_name,
			    RtpCallback cb, unsigned long user_data)
{
	OList *elem;
	for (elem=session->signal_tables;elem!=NULL;elem=o_list_next(elem)){
		RtpSignalTable *s=(RtpSignalTable*) elem->data;
		if (strcmp(signal_name,s->signal_name)==0){
			return rtp_signal_table_add(s,cb,user_data);
		}
	}
	ortp_warning ("rtp_session_signal_connect: inexistant signal %s",signal_name);
	return -1;
}


/**
 *	Removes callback function @cb to the list of callbacks for signal @signal.
 *
 * @param session a rtp session
 * @param signal_name	a signal name
 * @param cb	a callback function.
 * @return: 0 on success, a negative value if the callback was not found.
**/
int
rtp_session_signal_disconnect_by_callback (RtpSession * session, const char *signal_name,
					   RtpCallback cb)
{
	OList *elem;
	for (elem=session->signal_tables;elem!=NULL;elem=o_list_next(elem)){
		RtpSignalTable *s=(RtpSignalTable*) elem->data;
		if (strcmp(signal_name,s->signal_name)==0){
			return rtp_signal_table_remove_by_callback(s,cb);
		}
	}
	ortp_warning ("rtp_session_signal_connect: inexistant signal %s",signal_name);
	return -1;
}


/**
 * sets the initial sequence number of a sending session.
 * @param session		a rtp session freshly created.
 * @param addr			a 16 bit unsigned number.
 *
**/
void rtp_session_set_seq_number(RtpSession *session, uint16_t seq){
	session->rtp.snd_seq=seq;
}


uint16_t rtp_session_get_seq_number(RtpSession *session){
	return session->rtp.snd_seq;
}


/**
 *	Sets the SSRC for the outgoing stream.
 *  If not done, a random ssrc is used.
 *
 * @param session a rtp session.
 * @param ssrc an unsigned 32bit integer representing the synchronisation source identifier (SSRC).
**/
void
rtp_session_set_ssrc (RtpSession * session, uint32_t ssrc)
{
	session->snd.ssrc = ssrc;
}

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/**
 *	Get the SSRC for the outgoing stream.
 *
 * @param session a rtp session.
**/
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uint32_t
rtp_session_get_send_ssrc (RtpSession* session)
{
	return session->snd.ssrc;
}

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/**
 * Get the SSRC for the incoming stream.
 * 
 * If no packets have been received yet, 0 is returned.
**/
uint32_t rtp_session_get_recv_ssrc(RtpSession *session){
	return session->rcv.ssrc;
}

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void rtp_session_update_payload_type(RtpSession *session, int paytype){
	/* check if we support this payload type */
	PayloadType *pt=rtp_profile_get_payload(session->rcv.profile,paytype);
	if (pt!=0){
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		session->hw_recv_pt=paytype;
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		ortp_message ("payload type changed to %i(%s) !",
				 paytype,pt->mime_type);
		payload_type_changed(session,pt);
	}else{
		ortp_warning("Receiving packet with unknown payload type %i.",paytype);
	}
}
/**
 *	Sets the payload type of the rtp session. It decides of the payload types written in the
 *	of the rtp header for the outgoing stream, if the session is SENDRECV or SENDONLY.
 *	For payload type in incoming packets, the application can be informed by registering
 *	for the "payload_type_changed" signal, so that it can make the necessary changes
 *	on the downstream decoder that deals with the payload of the packets.
 *
 * @param session a rtp session
 * @param paytype the payload type number
 * @return 0 on success, -1 if the payload is not defined.
**/

int
rtp_session_set_send_payload_type (RtpSession * session, int paytype)
{
	session->snd.pt=paytype;
	return 0;
}

/**
 *@param session a rtp session
 *
 *@return the payload type currently used in outgoing rtp packets
**/
int rtp_session_get_send_payload_type(const RtpSession *session){
	return session->snd.pt;
}

/**
 *
 *	Sets the expected payload type for incoming packets.
 *	If the actual payload type in incoming packets is different that this expected payload type, thus
 *	the "payload_type_changed" signal is emitted.
 *
 *@param session a rtp session
 *@param paytype the payload type number
 *@return 0 on success, -1 if the payload is not defined.
**/

int
rtp_session_set_recv_payload_type (RtpSession * session, int paytype)
{
	PayloadType *pt;
	session->rcv.pt=paytype;
	session->hw_recv_pt=paytype;
	pt=rtp_profile_get_payload(session->rcv.profile,paytype);
	if (pt!=NULL){
		payload_type_changed(session,pt);
	}
	return 0;
}

/**
 *@param session a rtp session
 *
 * @return the payload type currently used in incoming rtp packets
**/
int rtp_session_get_recv_payload_type(const RtpSession *session){
	return session->rcv.pt;
}

/**
 *	Sets the expected payload type for incoming packets and payload type to be used for outgoing packets.
 *	If the actual payload type in incoming packets is different that this expected payload type, thus
 *	the "payload_type_changed" signal is emitted.
 *
 * @param session a rtp session
 * @param paytype the payload type number
 * @return 0 on success, -1 if the payload is not defined.
**/
int rtp_session_set_payload_type(RtpSession *session, int pt){
	if (rtp_session_set_send_payload_type(session,pt)<0) return -1;
	if (rtp_session_set_recv_payload_type(session,pt)<0) return -1;
	return 0;
}


static void rtp_header_init_from_session(rtp_header_t *rtp, RtpSession *session){
	rtp->version = 2;
	rtp->padbit = 0;
	rtp->extbit = 0;
	rtp->markbit= 0;
	rtp->cc = 0;
	rtp->paytype = session->snd.pt;
	rtp->ssrc = session->snd.ssrc;
	rtp->timestamp = 0;	/* set later, when packet is sended */
	/* set a seq number */
	rtp->seq_number=session->rtp.snd_seq;
}

/**
 *	Allocates a new rtp packet. In the header, ssrc and payload_type according to the session's
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 *	context. Timestamp is not set, it will be set when the packet is going to be
 *	sent with rtp_session_sendm_with_ts(). Sequence number is initalized to previous sequence number sent + 1
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 *	If payload_size is zero, thus an empty packet (just a RTP header) is returned.
 *
 *@param session a rtp session.
 *@param header_size the rtp header size. For standart size (without extensions), it is RTP_FIXED_HEADER_SIZE
 *@param payload data to be copied into the rtp packet.
 *@param payload_size size of data carried by the rtp packet.
 *@return a rtp packet in a mblk_t (message block) structure.
**/
mblk_t * rtp_session_create_packet(RtpSession *session,int header_size, const uint8_t *payload, int payload_size)
{
	mblk_t *mp;
	int msglen=header_size+payload_size;
	rtp_header_t *rtp;
	
	mp=allocb(msglen,BPRI_MED);
	rtp=(rtp_header_t*)mp->b_rptr;
	rtp_header_init_from_session(rtp,session);
	/*copy the payload, if any */
	mp->b_wptr+=header_size;
	if (payload_size){
		memcpy(mp->b_wptr,payload,payload_size);
		mp->b_wptr+=payload_size;
	}
	return mp;
}

/**
 *	Creates a new rtp packet using the given payload buffer (no copy). The header will be allocated separetely.
 *  In the header, ssrc and payload_type according to the session's
 *	context. Timestamp and seq number are not set, there will be set when the packet is going to be
 *	sent with rtp_session_sendm_with_ts().
 *	oRTP will send this packet using libc's sendmsg() (if this function is availlable!) so that there will be no
 *	packet concatenation involving copies to be done in user-space.
 *  @freefn can be NULL, in that case payload will be kept untouched.
 *
 * @param session a rtp session.
 * @param payload the data to be sent with this packet
 * @param payload_size size of data
 * @param freefn a function that will be called when the payload buffer is no more needed.
 * @return: a rtp packet in a mblk_t (message block) structure.
**/

mblk_t * rtp_session_create_packet_with_data(RtpSession *session, uint8_t *payload, int payload_size, void (*freefn)(void*))
{
	mblk_t *mp,*mpayload;
	int header_size=RTP_FIXED_HEADER_SIZE; /* revisit when support for csrc is done */
	rtp_header_t *rtp;
	
	mp=allocb(header_size,BPRI_MED);
	rtp=(rtp_header_t*)mp->b_rptr;
	rtp_header_init_from_session(rtp,session);
	mp->b_wptr+=header_size;
	/* create a mblk_t around the user supplied payload buffer */
	mpayload=esballoc(payload,payload_size,BPRI_MED,freefn);
	mpayload->b_wptr+=payload_size;
	/* link it with the header */
	mp->b_cont=mpayload;
	return mp;
}


/**
 * Creates a new rtp packet using the buffer given in arguments (no copy). 
 * In the header, ssrc and payload_type according to the session's
 *context. Timestamp and seq number are not set, there will be set when the packet is going to be
 *	sent with rtp_session_sendm_with_ts().
 *  @freefn can be NULL, in that case payload will be kept untouched.
 *
 * @param session a rtp session.
 * @param buffer a buffer that contains first just enough place to write a RTP header, then the data to send.
 * @param size the size of the buffer
 * @param freefn a function that will be called once the buffer is no more needed (the data has been sent).
 * @return a rtp packet in a mblk_t (message block) structure.
**/
mblk_t * rtp_session_create_packet_in_place(RtpSession *session,uint8_t *buffer, int size, void (*freefn)(void*) )
{
	mblk_t *mp;
	rtp_header_t *rtp;
	
	mp=esballoc(buffer,size,BPRI_MED,freefn);

	rtp=(rtp_header_t*)mp->b_rptr;
	rtp_header_init_from_session(rtp,session);
	return mp;
}


int
__rtp_session_sendm_with_ts (RtpSession * session, mblk_t *mp, uint32_t packet_ts, uint32_t send_ts)
{
	rtp_header_t *rtp;
	uint32_t packet_time;
	int error = 0;
	int packsize;
	RtpScheduler *sched=session->sched;
	RtpStream *stream=&session->rtp;

	if (session->flags & RTP_SESSION_SEND_NOT_STARTED)
	{
		session->rtp.snd_ts_offset = send_ts;
		/* Set initial last_rcv_time to first send time. */
		if ((session->flags & RTP_SESSION_RECV_NOT_STARTED)
		|| session->mode == RTP_SESSION_SENDONLY)
		{
		gettimeofday(&session->last_recv_time, NULL);
		}
		if (session->flags & RTP_SESSION_SCHEDULED)
		{
			session->rtp.snd_time_offset = sched->time_;
		}
		rtp_session_unset_flag (session,RTP_SESSION_SEND_NOT_STARTED);
	}
	/* if we are in blocking mode, then suspend the process until the scheduler it's time to send  the
	 * next packet */
	/* if the timestamp of the packet queued is older than current time, then you we must
	 * not block */
	if (session->flags & RTP_SESSION_SCHEDULED)
	{
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		wait_point_lock(&session->snd.wp);
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		packet_time =
			rtp_session_ts_to_time (session,
				     send_ts -
				     session->rtp.snd_ts_offset) +
					session->rtp.snd_time_offset;
		/*ortp_message("rtp_session_send_with_ts: packet_time=%i time=%i",packet_time,sched->time_);*/
		if (TIME_IS_STRICTLY_NEWER_THAN (packet_time, sched->time_))
		{
			wait_point_wakeup_at(&session->snd.wp,packet_time,(session->flags & RTP_SESSION_BLOCKING_MODE)!=0);	
			session_set_clr(&sched->w_sessions,session);	/* the session has written */
		}
		else session_set_set(&sched->w_sessions,session);	/*to indicate select to return immediately */
		wait_point_unlock(&session->snd.wp);
	}
	
	if(mp==NULL) {/*for people who just want to be blocked but
		 do not want to send anything.*/
		session->rtp.snd_last_ts = packet_ts;
		return 0;
	}

	rtp=(rtp_header_t*)mp->b_rptr;
	
	packsize = msgdsize(mp) ;

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	if (rtp->version == 0) {
		/* We are probably trying to send a STUN packet so don't change its content. */
	} else {
		rtp->timestamp=packet_ts;
		if (session->snd.telephone_events_pt==rtp->paytype)
		{
			rtp->seq_number = session->rtp.snd_seq;
			session->rtp.snd_seq++;
		}
		else
			session->rtp.snd_seq=rtp->seq_number+1;
		session->rtp.snd_last_ts = packet_ts;
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		ortp_global_stats.sent += packsize;
		stream->sent_payload_bytes+=packsize-RTP_FIXED_HEADER_SIZE;
		stream->stats.sent += packsize;
		ortp_global_stats.packet_sent++;
		stream->stats.packet_sent++;
	}
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	error = rtp_session_rtp_send (session, mp);
	/*send RTCP packet if needed */
	rtp_session_rtcp_process_send(session);
	/* receives rtcp packet if session is send-only*/
	/*otherwise it is done in rtp_session_recvm_with_ts */
	if (session->mode==RTP_SESSION_SENDONLY) rtp_session_rtcp_recv(session);
	return error;
}

/**
 *	Send the rtp datagram @mp to the destination set by rtp_session_set_remote_addr() 
 *	with timestamp @timestamp. For audio data, the timestamp is the number
 *	of the first sample resulting of the data transmitted. See rfc1889 for details.
 *  The packet (@mp) is freed once it is sended.
 *
 *@param session a rtp session.
 *@param mp a rtp packet presented as a mblk_t.
 *@param timestamp the timestamp of the data to be sent.
 * @return the number of bytes sent over the network.
**/

int rtp_session_sendm_with_ts(RtpSession *session, mblk_t *packet, uint32_t timestamp){
	return __rtp_session_sendm_with_ts(session,packet,timestamp,timestamp);
}




/**
 *	Send a rtp datagram to the destination set by rtp_session_set_remote_addr() containing
 *	the data from @buffer with timestamp @userts. This is a high level function that uses
 *	rtp_session_create_packet() and rtp_session_sendm_with_ts() to send the data.
 *
 *@param session a rtp session.
 *@param buffer a buffer containing the data to be sent in a rtp packet.
 *@param len the length of the data buffer, in bytes.
 *@param userts	the timestamp of the data to be sent. Refer to the rfc to know what it is.
 *
 *@param return the number of bytes sent over the network.
**/
int
rtp_session_send_with_ts (RtpSession * session, const uint8_t * buffer, int len,
			  uint32_t userts)
{
	mblk_t *m;
	int err;
#ifdef USE_SENDMSG
	m=rtp_session_create_packet_with_data(session,(uint8_t*)buffer,len,NULL);
#else
	m = rtp_session_create_packet(session,RTP_FIXED_HEADER_SIZE,(uint8_t*)buffer,len);
#endif
	err=rtp_session_sendm_with_ts(session,m,userts);
	return err;
}



extern void rtcp_parse(RtpSession *session, mblk_t *mp);



static void payload_type_changed_notify(RtpSession *session, int paytype){
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	PayloadType *pt = rtp_profile_get_payload(session->rcv.profile,paytype);
	if (pt) {
		session->rcv.pt = paytype;
		rtp_signal_table_emit (&session->on_payload_type_changed);
	}
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}
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/**
 *	Try to get an rtp packet presented as a mblk_t structure from the rtp session at a given sequence number.
 *	This function is very usefull for codec with Forward error correction capabilities
 *
 *	This function returns the entire packet (with header).
 *
 *	 *
 * @param session a rtp session.
 * @param sequence_number a sequence number.
 *
 * @return a rtp packet presented as a mblk_t, or NULL if not found.
 **/

mblk_t *
rtp_session_pick_with_cseq (RtpSession * session, const uint16_t sequence_number) {
	queue_t* q= &session->rtp.rq;
	mblk_t* mb;
	for (mb=qbegin(q); !qend(q,mb); mb=qnext(q,mb)){
		if (rtp_get_seqnumber(mb)==sequence_number) {
			return mb;
		}
	}
	return NULL;
}
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/**
 *	Try to get a rtp packet presented as a mblk_t structure from the rtp session.
 *	The @user_ts parameter is relative to the first timestamp of the incoming stream. In other
 *	words, the application does not have to know the first timestamp of the stream, it can
 *	simply call for the first time this function with @user_ts=0, and then incrementing it
 *	as it want. The RtpSession takes care of synchronisation between the stream timestamp
 *	and the user timestamp given here.
 *
 *	This function returns the entire packet (with header).
 *
 *	The behaviour of this function has changed since version 0.15.0. Previously the payload data could be 
 *	accessed using  mblk_t::b_cont::b_rptr field of the returned mblk_t.
 *	This is no more the case.
 *	The convenient way of accessing the payload data is to use rtp_get_payload() :
 *	@code
 *	unsigned char *payload;
 *	int payload_size;
 *	payload_size=rtp_get_payload(mp,&payload);
 *	@endcode
 *	OR simply skip the header this way, the data is then comprised between mp->b_rptr and mp->b_wptr:
 *	@code
 *	rtp_get_payload(mp,&mp->b_rptr);
 *	@endcode
 *
 *
 * @param session a rtp session.
 * @param user_ts a timestamp.
 *
 * @return a rtp packet presented as a mblk_t.
**/

mblk_t *
rtp_session_recvm_with_ts (RtpSession * session, uint32_t user_ts)
{
	mblk_t *mp = NULL;
	rtp_header_t *rtp;
	uint32_t ts;
	uint32_t packet_time;
	RtpScheduler *sched=session->sched;
	RtpStream *stream=&session->rtp;
	int rejected=0;
	bool_t read_socket=TRUE;

	/* if we are scheduled, remember the scheduler time at which the application has
	 * asked for its first timestamp */

	if (session->flags & RTP_SESSION_RECV_NOT_STARTED)
	{
		session->rtp.rcv_query_ts_offset = user_ts;
		/* Set initial last_rcv_time to first recv time. */
		if ((session->flags & RTP_SESSION_SEND_NOT_STARTED)
		|| session->mode == RTP_SESSION_RECVONLY){
			gettimeofday(&session->last_recv_time, NULL);
		}
		if (session->flags & RTP_SESSION_SCHEDULED)
		{
			session->rtp.rcv_time_offset = sched->time_;
			//ortp_message("setting snd_time_offset=%i",session->rtp.snd_time_offset);
		}
		rtp_session_unset_flag (session,RTP_SESSION_RECV_NOT_STARTED);
	}else{
		/*prevent reading from the sockets when two 
		consecutives calls for a same timestamp*/
		if (user_ts==session->rtp.rcv_last_app_ts)
			read_socket=FALSE;
	}
	session->rtp.rcv_last_app_ts = user_ts;
	if (read_socket){
		rtp_session_rtp_recv (session, user_ts);
		rtp_session_rtcp_recv(session);
	}
	/* check for telephone event first */
	mp=getq(&session->rtp.tev_rq);
	if (mp!=NULL){
		int msgsize=msgdsize(mp);
		ortp_global_stats.recv += msgsize;
		stream->stats.recv += msgsize;
		rtp_signal_table_emit2(&session->on_telephone_event_packet,(long)mp);
		rtp_session_check_telephone_events(session,mp);
		freemsg(mp);
		mp=NULL;
	}
	
	/* then now try to return a media packet, if possible */
	/* first condition: if the session is starting, don't return anything
	 * until the queue size reaches jitt_comp */
	
	if (session->flags & RTP_SESSION_RECV_SYNC)
	{
		queue_t *q = &session->rtp.rq;
		if (qempty(q))
		{
			ortp_debug ("Queue is empty.");
			goto end;
		}
		rtp = (rtp_header_t *) qfirst(q)->b_rptr;
		session->rtp.rcv_ts_offset = rtp->timestamp;
		session->rtp.rcv_last_ret_ts = user_ts;	/* just to have an init value */
		session->rcv.ssrc = rtp->ssrc;
		/* delete the recv synchronisation flag */
		rtp_session_unset_flag (session, RTP_SESSION_RECV_SYNC);
	}

	/*calculate the stream timestamp from the user timestamp */
	ts = jitter_control_get_compensated_timestamp(&session->rtp.jittctl,user_ts);
	if (session->rtp.jittctl.enabled==TRUE){
		if (session->permissive)
			mp = rtp_getq_permissive(&session->rtp.rq, ts,&rejected);
		else{
			mp = rtp_getq(&session->rtp.rq, ts,&rejected);
		}
	}else mp=getq(&session->rtp.rq);/*no jitter buffer at all*/
	
	stream->stats.outoftime+=rejected;
	ortp_global_stats.outoftime+=rejected;

	goto end;

      end:
	if (mp != NULL)
	{
		int msgsize = msgdsize (mp);	/* evaluate how much bytes (including header) is received by app */
		uint32_t packet_ts;
		ortp_global_stats.recv += msgsize;
		stream->stats.recv += msgsize;
		rtp = (rtp_header_t *) mp->b_rptr;
		packet_ts=rtp->timestamp;
		ortp_debug("Returning mp with ts=%i", packet_ts);
		/* check for payload type changes */
		if (session->rcv.pt != rtp->paytype)
		{
			payload_type_changed_notify(session, rtp->paytype);
		}
		/* update the packet's timestamp so that it corrected by the 
		adaptive jitter buffer mechanism */
		if (session->rtp.jittctl.adaptive){
			uint32_t changed_ts;
			/* only update correction offset between packets of different
			timestamps*/
			if (packet_ts!=session->rtp.rcv_last_ts)
				jitter_control_update_corrective_slide(&session->rtp.jittctl);
			changed_ts=packet_ts+session->rtp.jittctl.corrective_slide;
			rtp->timestamp=changed_ts;
			/*ortp_debug("Returned packet has timestamp %u, with clock slide compensated it is %u",packet_ts,rtp->timestamp);*/
		}
		session->rtp.rcv_last_ts = packet_ts;
		if (!(session->flags & RTP_SESSION_FIRST_PACKET_DELIVERED)){
			rtp_session_set_flag(session,RTP_SESSION_FIRST_PACKET_DELIVERED);
		}
	}
	else
	{
		ortp_debug ("No mp for timestamp queried");
	}
	rtp_session_rtcp_process_recv(session);
	
	if (session->flags & RTP_SESSION_SCHEDULED)
	{
		/* if we are in blocking mode, then suspend the calling process until timestamp
		 * wanted expires */
		/* but we must not block the process if the timestamp wanted by the application is older
		 * than current time */
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		wait_point_lock(&session->rcv.wp);
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		packet_time =
			rtp_session_ts_to_time (session,
				     user_ts -
				     session->rtp.rcv_query_ts_offset) +
			session->rtp.rcv_time_offset;
		ortp_debug ("rtp_session_recvm_with_ts: packet_time=%i, time=%i",packet_time, sched->time_);
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		if (TIME_IS_STRICTLY_NEWER_THAN (packet_time, sched->time_))
		{
			wait_point_wakeup_at(&session->rcv.wp,packet_time, (session->flags & RTP_SESSION_BLOCKING_MODE)!=0);
			session_set_clr(&sched->r_sessions,session);
		}
		else session_set_set(&sched->r_sessions,session);	/*to unblock _select() immediately */
		wait_point_unlock(&session->rcv.wp);
	}
	return mp;
}


/**
 *	NOTE: use of this function is discouraged when sending payloads other than
 *	pcm/pcmu/pcma/adpcm types.
 *	rtp_session_recvm_with_ts() does better job.
 *
 *	Tries to read the bytes of the incoming rtp stream related to timestamp ts. In case 
 *	where the user supplied buffer @buffer is not large enough to get all the data 
 *	related to timestamp ts, then *( have_more) is set to 1 to indicate that the application
 *	should recall the function with the same timestamp to get more data.
 *	
 *  When the rtp session is scheduled (see rtp_session_set_scheduling_mode() ), and the 
 *	blocking mode is on (see rtp_session_set_blocking_mode() ), then the calling thread
 *	is suspended until the timestamp given as argument expires, whatever a received packet 
 *	fits the query or not.
 *
 *	Important note: it is clear that the application cannot know the timestamp of the first
 *	packet of the incoming stream, because it can be random. The @ts timestamp given to the
 *	function is used relatively to first timestamp of the stream. In simple words, 0 is a good
 *	value to start calling this function.
 *
 *	This function internally calls rtp_session_recvm_with_ts() to get a rtp packet. The content
 *	of this packet is then copied into the user supplied buffer in an intelligent manner:
 *	the function takes care of the size of the supplied buffer and the timestamp given in  
 *	argument. Using this function it is possible to read continous audio data (e.g. pcma,pcmu...)
 *	with for example a standart buffer of size of 160 with timestamp incrementing by 160 while the incoming
 *	stream has a different packet size.
 *
 *Returns: if a packet was availlable with the corresponding timestamp supplied in argument 
 *	then the number of bytes written in the user supplied buffer is returned. If no packets
 *	are availlable, either because the sender has not started to send the stream, or either
 *	because silence packet are not transmitted, or either because the packet was lost during
 *	network transport, then the function returns zero.
 *@param session a rtp session.
 *@param buffer a user supplied buffer to write the data.
 *@param len the length in bytes of the user supplied buffer.
 *@param ts the timestamp wanted.
 *@param have_more the address of an integer to indicate if more data is availlable for the given timestamp.
 *
**/
int rtp_session_recv_with_ts (RtpSession * session, uint8_t * buffer,
			       int len, uint32_t ts, int * have_more){
	mblk_t *mp=NULL;
	int plen,blen=0;
	*have_more=0;
	while(1){
		if (session->pending){
			mp=session->pending;
			session->pending=NULL;
		}else {
			mp=rtp_session_recvm_with_ts(session,ts);
			if (mp!=NULL) rtp_get_payload(mp,&mp->b_rptr);
		}
		if (mp){
			plen=mp->b_wptr-mp->b_rptr;
			if (plen<=len){
				memcpy(buffer,mp->b_rptr,plen);
				buffer+=plen;
				blen+=plen;
				len-=plen;
				freemsg(mp);
				mp=NULL;
			}else{
				memcpy(buffer,mp->b_rptr,len);
				mp->b_rptr+=len;
				buffer+=len;
				blen+=len;
				len=0;
				session->pending=mp;
				*have_more=1;
				break;
			}
		}else break;
	}
	return blen;
}
/**
 *	When the rtp session is scheduled and has started to send packets, this function
 *	computes the timestamp that matches to the present time. Using this function can be 
 *	usefull when sending discontinuous streams. Some time can be elapsed between the end
 *	of a stream burst and the begin of a new stream burst, and the application may be not
 *	not aware of this elapsed time. In order to get a valid (current) timestamp to pass to 
 *	#rtp_session_send_with_ts() or #rtp_session_sendm_with_ts(), the application may
 *	use rtp_session_get_current_send_ts().
 *
 * @param session a rtp session.
 * @return the current send timestamp for the rtp session.
**/
uint32_t rtp_session_get_current_send_ts(RtpSession *session)
{
	uint32_t userts;
	uint32_t session_time;
	RtpScheduler *sched=session->sched;
	PayloadType *payload;
	payload=rtp_profile_get_payload(session->snd.profile,session->snd.pt);
	return_val_if_fail(payload!=NULL, 0);
	if ( (session->flags & RTP_SESSION_SCHEDULED)==0 ){
		ortp_warning("can't guess current timestamp because session is not scheduled.");
		return 0;
	}
	session_time=sched->time_-session->rtp.snd_time_offset;
	userts=  (uint32_t)( ( (double)(session_time) * (double) payload->clock_rate )/ 1000.0)
				+ session->rtp.snd_ts_offset;
	return userts;
}

/**
 * Same thing as rtp_session_get_current_send_ts() except that it's for an incoming stream.
 * Works only on scheduled mode.
 *
 * @param session a rtp session.
 * @return the theoritical that would have to be receive now.
 *
**/
uint32_t rtp_session_get_current_recv_ts(RtpSession *session){
	uint32_t userts;
	uint32_t session_time;
	RtpScheduler *sched=ortp_get_scheduler();
	PayloadType *payload;
	payload=rtp_profile_get_payload(session->rcv.profile,session->rcv.pt);
	return_val_if_fail(payload!=NULL, 0);
	if ( (session->flags & RTP_SESSION_SCHEDULED)==0 ){
		ortp_warning("can't guess current timestamp because session is not scheduled.");
		return 0;
	}
	session_time=sched->time_-session->rtp.rcv_time_offset;
	userts=  (uint32_t)( ( (double)(session_time) * (double) payload->clock_rate )/ 1000.0)
				+ session->rtp.rcv_ts_offset;
	return userts;
}

/**
 * oRTP has the possibility to inform the application through a callback registered 
 * with rtp_session_signal_connect about crazy incoming RTP stream that jumps from 
 * a timestamp N to N+some_crazy_value. This lets the opportunity for the application
 * to reset the session in order to resynchronize, or any other action like stopping the call
 * and reporting an error.
 * @param session the rtp session
 * @param ts_step a time interval in miliseconds
 *
**/
void rtp_session_set_time_jump_limit(RtpSession *session, int milisecs){
	uint32_t ts;
	session->rtp.time_jump=milisecs;
	ts=rtp_session_time_to_ts(session,milisecs);
	if (ts==0) session->rtp.ts_jump=1<<31;	/* do not detect ts jump */
	else session->rtp.ts_jump=ts;
}

/**
 * Closes the rtp and rtcp sockets.
**/
void rtp_session_release_sockets(RtpSession *session){
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	if (session->rtp.socket!=(ortp_socket_t)-1) close_socket (session->rtp.socket);
	if (session->rtcp.socket!=(ortp_socket_t)-1) close_socket (session->rtcp.socket);
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	session->rtp.socket=-1;
	session->rtcp.socket=-1;
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	if (session->rtp.tr && session->rtp.tr->t_close)
		session->rtp.tr->t_close(session->rtp.tr, session->rtp.tr->data);
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	session->rtp.tr = 0;
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	if (session->rtcp.tr && session->rtcp.tr->t_close)
		session->rtcp.tr->t_close(session->rtcp.tr, session->rtcp.tr->data);
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	session->rtcp.tr = 0;

	/* don't discard remote addresses, then can be preserved for next use.
	session->rtp.rem_addrlen=0;
	session->rtcp.rem_addrlen=0;
	*/
}

ortp_socket_t rtp_session_get_rtp_socket(const RtpSession *session){
	return rtp_session_using_transport(session, rtp) ? (session->rtp.tr->t_getsocket)(session->rtp.tr) : session->rtp.socket;
}

ortp_socket_t rtp_session_get_rtcp_socket(const RtpSession *session){
	return rtp_session_using_transport(session, rtcp) ? (session->rtcp.tr->t_getsocket)(session->rtcp.tr) : session->rtcp.socket;
}

/**
 * Register an event queue.
 * An application can use an event queue to get informed about various RTP events.
**/
void rtp_session_register_event_queue(RtpSession *session, OrtpEvQueue *q){
	session->eventqs=o_list_append(session->eventqs,q);
}

void rtp_session_unregister_event_queue(RtpSession *session, OrtpEvQueue *q){
	session->eventqs=o_list_remove(session->eventqs,q);
}

void rtp_session_dispatch_event(RtpSession *session, OrtpEvent *ev){
	OList *it;
	int i;
	for(i=0,it=session->eventqs;it!=NULL;it=it->next,++i){
		ortp_ev_queue_put((OrtpEvQueue*)it->data,ortp_event_dup(ev));
	}	
	ortp_event_destroy(ev);
}


void rtp_session_uninit (RtpSession * session)
{
	/* first of all remove the session from the scheduler */
	if (session->flags & RTP_SESSION_SCHEDULED)
	{
		rtp_scheduler_remove_session (session->sched,session);
	}
	/*flush all queues */
	flushq(&session->rtp.rq, FLUSHALL);
	flushq(&session->rtp.tev_rq, FLUSHALL);

	if (session->eventqs!=NULL) o_list_free(session->eventqs);
	/* close sockets */
	rtp_session_release_sockets(session);

	wait_point_uninit(&session->snd.wp);
	wait_point_uninit(&session->rcv.wp);
	if (session->current_tev!=NULL) freemsg(session->current_tev);
	if (session->rtp.cached_mp!=NULL) freemsg(session->rtp.cached_mp);
	if (session->rtcp.cached_mp!=NULL) freemsg(session->rtcp.cached_mp);
	if (session->sd!=NULL) freemsg(session->sd);

	session->signal_tables = o_list_free(session->signal_tables);
	msgb_allocator_uninit(&session->allocator);
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	if (session->net_sim_ctx)
		ortp_network_simulator_destroy(session->net_sim_ctx);

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#if (_WIN32_WINNT >= 0x0600)
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	if (session->rtp.QoSFlowID != 0)
    {
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		OSVERSIONINFOEX ovi;
		memset(&ovi, 0, sizeof(ovi));
		ovi.dwOSVersionInfoSize = sizeof(ovi);
		GetVersionEx((LPOSVERSIONINFO) & ovi);

		ortp_message("check OS support for qwave.lib: %i %i %i\n",
					ovi.dwMajorVersion, ovi.dwMinorVersion, ovi.dwBuildNumber);
		if (ovi.dwMajorVersion > 5) {

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			if (FAILED(__HrLoadAllImportsForDll("qwave.dll"))) {
				ortp_warning("Failed to load qwave.dll: no QoS available\n" );
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			}
			else
			{
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				BOOL QoSResult;
				QoSResult = QOSRemoveSocketFromFlow(session->rtp.QoSHandle, 
													0, 
													session->rtp.QoSFlowID, 
													0);

				if (QoSResult != TRUE){
					ortp_error("QOSRemoveSocketFromFlow failed to end a flow with error %d\n", 
							GetLastError());
				}
				session->rtp.QoSFlowID=0;
			}
		}
    }

    if (session->rtp.QoSHandle != NULL)
    {
        QOSCloseHandle(session->rtp.QoSHandle);
		session->rtp.QoSHandle=NULL;
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    }
#endif
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}

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/**
 * Sets the number of packets containg a new SSRC that will trigger the
 * "ssrc_changed" callback.
**/
void rtp_session_set_ssrc_changed_threshold(RtpSession *session, int numpackets){
	session->rtp.ssrc_changed_thres=numpackets;
}

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/**
 * Resynchronize to the incoming RTP streams.
 * This can be useful to handle discoutinuous timestamps.
 * For example, call this function from the timestamp_jump signal handler.
 * @param session the rtp session
**/
void rtp_session_resync(RtpSession *session){
	flushq (&session->rtp.rq, FLUSHALL);
	rtp_session_set_flag(session, RTP_SESSION_RECV_SYNC);
	rtp_session_unset_flag(session,RTP_SESSION_FIRST_PACKET_DELIVERED);
	jitter_control_init(&session->rtp.jittctl,-1,NULL);
}

/**
 * Reset the session: local and remote addresses are kept. It resets timestamp, sequence 
 * number, and calls rtp_session_resync().
 *
 * @param session a rtp session.
**/
void rtp_session_reset (RtpSession * session)
{
	rtp_session_set_flag (session, RTP_SESSION_RECV_NOT_STARTED);
	rtp_session_set_flag (session, RTP_SESSION_SEND_NOT_STARTED);
	//session->ssrc=0;
	session->rtp.snd_time_offset = 0;
	session->rtp.snd_ts_offset = 0;
	session->rtp.snd_rand_offset = 0;
	session->rtp.snd_last_ts = 0;
	session->rtp.rcv_time_offset = 0;
	session->rtp.rcv_ts_offset = 0;
	session->rtp.rcv_query_ts_offset = 0;
	session->rtp.rcv_last_ts = 0;
	session->rtp.rcv_last_app_ts = 0;
	session->rtp.hwrcv_extseq = 0;
	session->rtp.hwrcv_since_last_SR=0;
	session->rtp.snd_seq = 0;
	session->rtp.sent_payload_bytes=0;
	rtp_session_clear_send_error_code(session);
	rtp_session_clear_recv_error_code(session);
	rtp_stats_reset(&session->rtp.stats);
	rtp_session_resync(session);
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	session->ssrc_set=FALSE;
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}

/**
 * Retrieve the session's statistics.
**/
const rtp_stats_t * rtp_session_get_stats(const RtpSession *session){
	return &session->rtp.stats;
}

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/**
 * Retrieves the session's jitter specific statistics.
**/
const jitter_stats_t * rtp_session_get_jitter_stats( const RtpSession *session ) {
	return &session->rtp.jitter_stats;
}

/**
 * @brief For <b>test purpose only</b>, sets a constant lost packet value within <b>all</b> RTCP output packets.@n
 *
 * The SR or RR RTCP packet contain a lost packet field. After this procedure is called, the lost packet field will be set to a constant value in all output SR or RR packets. This parameter will overridden the actual number of lost packets in the input RTP stream that the RTCP stack had previously processed.
 * @param s : the rtp session.
 * @param value : the lost packets test vector value.
**/
void rtp_session_rtcp_set_lost_packet_value( struct _RtpSession *s, const unsigned int value ) {
	s->lost_packets_test_vector = value;
	s->flags|=RTCP_OVERRIDE_LOST_PACKETS;
}

/**
 * @brief For <b>test purpose only</b>, sets a constant interarrival_jitter value within <b>all</b> RTCP output packets.@n
 *
 * The SR or RR RTCP packet contain an interarrival jitter field. After this procedure is called, the interarrival jitter field will be set to a constant value in all output SR or RR packets. This parameter will overridden the actual interarrival jitter value that was processed by the RTCP stack.
 * @param s : the rtp session.
 * @param value : the interarrival jitter test vector value.
**/
void rtp_session_rtcp_set_jitter_value( struct _RtpSession *s, const unsigned int value ) {
	s->interarrival_jitter_test_vector = value;
	s->flags|=RTCP_OVERRIDE_JITTER;
}

/**
 * @brief For <b>test purpose only</b>, simulates a constant RTT (Round Trip Time) value by setting the LSR field within <b>all</b> returned RTCP output packets.@n
 *
 * The RTT processing involves two RTCP packets exchanged between two different devices.@n
 * In a <b>normal</b> operation the device 1 issues a SR packets at time T0, hence this packet has a timestamp field set to T0.
 * The LSR and DLSR fiels of that packet are not considered here. This packet is received by the Device 2 at T1. 
 * In response, the Device 2 issues another SR or RR packets at T2 with the following fields;
 * - a timestamp set to T2.
 * - a LSR (Last SR packet timestamp) field set to T0 ( this value has been extracted from the first packet).
 * - a DLSR (Delay since Last SR packet) field set to (T2 - T1).
 * .
 * This packet is received by The Device 1 at T3. So the Device 1 is now able to process the RTT using the formula :
 * RTT = T3 - LSR - DLSR = (T1 - T0) - (T3 - T2).@n
 * This way of processing is described in par. 6.4 of the RFC3550 standard.
 *
 * In the <b>test</b> mode that is enabled by this procedure, the RTCP stack is considered as beeing part of the device 2. For setting the RTT to a constant RTT0 value, the Device 2 artificially sets the LSR field of the second packet to (T1 - RTT0), instead of T0 in normal mode. The two other fields (timestamp and DLSR) are set as in the normal mode. So the Device 1 will process :
 * RTT = T3 - LSR - DLSR = RTT0 + (T3 - T2) that is near to RTT0 is T3 - T2 is small enough.
 * @note It is impossible to actually make the mesured RTT strictly equal to RTT0, as the packet trip time (T3 - T2) is unknown when this packet is issued by the Device 2.
 * @param s : the rtp session.
 * @param value : The desired RTT test vector value (RTT0).
**/
void rtp_session_rtcp_set_delay_value( struct _RtpSession *s, const unsigned int value ) {
	s->delay_test_vector= value;
	s->flags|=RTCP_OVERRIDE_DELAY;
}

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void rtp_session_reset_stats(RtpSession *session){
	memset(&session->rtp.stats,0,sizeof(rtp_stats_t));
}

/**
 * Stores some application specific data into the session, so that it is easy to retrieve it from the signal callbacks using rtp_session_get_data().
 * @param session a rtp session
 * @param data an opaque pointer to be stored in the session
**/

void rtp_session_set_data(RtpSession *session, void *data){
	session->user_data=data;
}

/**
 * @param session a rtp session
 * @return the void pointer previously set using rtp_session_set_data()
**/
void *rtp_session_get_data(const RtpSession *session){
	return session->user_data;
}

/**
 * Enable or disable the "rtp symmetric" hack which consists of the following:
 * after the first packet is received, the source address of the packet 
 * is set to be the destination address for all next packets.
 * This is useful to pass-through firewalls.
 * @param session a rtp session
 * @param yesno a boolean to enable or disable the feature
 *
**/
void
rtp_session_set_symmetric_rtp (RtpSession * session, bool_t yesno)
{
	session->symmetric_rtp =yesno;
}

/**
 *	If yesno is TRUE, thus a connect() syscall is done on the socket to 
 *	the destination address set by rtp_session_set_remote_addr(), or
 *	if the session does symmetric rtp (see rtp_session_set_symmetric_rtp())
 *	a the connect() is done to the source address of the first packet received.
 *	Connecting a socket has effect of rejecting all incoming packets that 
 *	don't come from the address specified in connect().
 *	It also makes ICMP errors (such as connection refused) available to the
 *	application.
 *	@param session a rtp session
 *	@param yesno a boolean to enable or disable the feature
 *
**/
void rtp_session_set_connected_mode(RtpSession *session, bool_t yesno){
	session->use_connect=yesno;
}

static float compute_bw(struct timeval *orig, unsigned int bytes){
	struct timeval current;
	float bw;
	float time;
	if (bytes==0) return 0;
	gettimeofday(&current,NULL);
	time=(float)(current.tv_sec - orig->tv_sec) +
		((float)(current.tv_usec - orig->tv_usec)*1e-6);
	bw=((float)bytes)*8/(time+0.001); 
	/*+0.0001 avoids a division by zero without changing the results significatively*/
	return bw;
}

float rtp_session_compute_recv_bandwidth(RtpSession *session){
	float bw;
	bw=compute_bw(&session->rtp.recv_bw_start,session->rtp.recv_bytes);
	session->rtp.recv_bytes=0;
	return bw;
}

float rtp_session_compute_send_bandwidth(RtpSession *session){
	float bw;
	bw=compute_bw(&session->rtp.send_bw_start,session->rtp.sent_bytes);
	session->rtp.sent_bytes=0;
	return bw;
}

int rtp_session_get_last_send_error_code(RtpSession *session){
	return session->rtp.send_errno;
}

void rtp_session_clear_send_error_code(RtpSession *session){
	session->rtp.send_errno=0;
}

int rtp_session_get_last_recv_error_code(RtpSession *session){
	return session->rtp.recv_errno;
}

void rtp_session_clear_recv_error_code(RtpSession *session){
	session->rtp.send_errno=0;
}

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/**
 * Returns the last known round trip propagation delay.
 *
 * This value is known after successful RTCP SR or RR exchanged between a sender and a receiver.
 * oRTP automatically takes care of sending SR or RR packets.
 * You might want to call this function when you receive an RTCP event (see rtp_session_register_event_queue() ).
 * This value might not be known: at the beginning when no RTCP packets have been exchanged yet, or simply because the
 * rtcp channel is broken due to firewall problematics, or because the remote implementation does not support RTCP.
 *
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 * @returns the round trip propagation time in seconds if known, -1 if unknown. 
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**/
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float rtp_session_get_round_trip_propagation(RtpSession *session){
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	return session->rtt;
}

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/**
 * Destroys a rtp session.
 * All memory allocated for the RtpSession is freed.
 *
 * @param session a rtp session.
**/
void rtp_session_destroy (RtpSession * session)
{
	rtp_session_uninit (session);
	ortp_free (session);
}

void rtp_session_make_time_distorsion(RtpSession *session, int milisec)
{
	session->rtp.snd_time_offset+=milisec;
}


/* packet api */

void rtp_add_csrc(mblk_t *mp, uint32_t csrc)
{
	rtp_header_t *hdr=(rtp_header_t*)mp->b_rptr;
	hdr->csrc[hdr->cc]=csrc;
	hdr->cc++;
}

/**
 * Get a pointer to the beginning of the payload data of the RTP packet.
 * @param packet a RTP packet represented as a mblk_t
 * @param start a pointer to the beginning of the payload data, pointing inside the packet.
 * @return the length of the payload data.
**/
int rtp_get_payload(mblk_t *packet, unsigned char **start){
	unsigned char *tmp;
	int header_len=RTP_FIXED_HEADER_SIZE+(rtp_get_cc(packet)*4);
	tmp=packet->b_rptr+header_len;
	if (tmp>packet->b_wptr){
		if (packet->b_cont!=NULL){
			tmp=packet->b_cont->b_rptr+(header_len- (packet->b_wptr-packet->b_rptr));
			if (tmp<=packet->b_cont->b_wptr){
				*start=tmp;
				return packet->b_cont->b_wptr-tmp;
			}
		}
		ortp_warning("Invalid RTP packet");
		return -1;
	}
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	if (rtp_get_extbit(packet)){
		int extsize=rtp_get_extheader(packet,NULL,NULL);
		if (extsize>=0){
			tmp+=4+extsize;
		}
	}
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	*start=tmp;
	return packet->b_wptr-tmp;
}

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/**
 * Obtain the extension header if any.
 * @param packet the RTP packet.
 * @param profile the profile field of the extension header
 * @param start_ext_header pointer that will be set to the beginning of the payload of the extension header.
 * @return the size of the extension in bytes (the payload size, it can be 0), -1 if parsing of the extension header failed or if no extension is present.
**/
int rtp_get_extheader(mblk_t *packet, uint16_t *profile, uint8_t **start_ext){
	int size=0;
	uint8_t *ext_header;
	if (rtp_get_extbit(packet)){
		ext_header=packet->b_rptr+RTP_FIXED_HEADER_SIZE+(rtp_get_cc(packet)*4);
		if (ext_header+4 <= packet->b_wptr){
			uint32_t h=ntohl(*(uint32_t*)ext_header);
			size=(int)(h & 0xFFFF);
			if (profile) *profile=(h>>16);
			size=(size*4); /*the size is given in the packet as multiple of 32 bit words, excluding the 4 byte header*/
			if ((ext_header+4+size)> packet->b_wptr){
				ortp_warning("Inconsistent size for rtp extension header");
				return -1;
			}
			if (start_ext) *start_ext=ext_header+4;
			return size;
		}else{
			ortp_warning("Insufficient size for rtp extension header.");
			return -1;
		}
	}
	return -1;
}

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/**
 *  Gets last time a valid RTP or RTCP packet was received.
 * @param session RtpSession to get last receive time from.
 * @param tv Pointer to struct timeval to fill.
 *
**/
void
rtp_session_get_last_recv_time(RtpSession *session, struct timeval *tv)
{
#ifdef PERF
	ortp_error("rtp_session_get_last_recv_time() feature disabled.");
#else
    	*tv = session->last_recv_time;
#endif
}



uint32_t rtp_session_time_to_ts(RtpSession *session, int millisecs){
	PayloadType *payload;
	payload =
		rtp_profile_get_payload (session->snd.profile,
					 session->snd.pt);
	if (payload == NULL)
	{
		ortp_warning
			("rtp_session_ts_to_t: use of unsupported payload type %d.", session->snd.pt);
		return 0;
	}
	/* the return value is in milisecond */
	return (uint32_t) (payload->clock_rate*(double) (millisecs/1000.0f));
}

/* function used by the scheduler only:*/
uint32_t rtp_session_ts_to_time (RtpSession * session, uint32_t timestamp)
{
	PayloadType *payload;
	payload =
		rtp_profile_get_payload (session->snd.profile,
					 session->snd.pt);
	if (payload == NULL)
	{
		ortp_warning
			("rtp_session_ts_to_t: use of unsupported payload type %d.", session->snd.pt);
		return 0;
	}
	/* the return value is in milisecond */
	return (uint32_t) (1000.0 *
			  ((double) timestamp /
			   (double) payload->clock_rate));
}


/* time is the number of miliseconds elapsed since the start of the scheduler */
void rtp_session_process (RtpSession * session, uint32_t time, RtpScheduler *sched)
{
	wait_point_lock(&session->snd.wp);
	if (wait_point_check(&session->snd.wp,time)){
		session_set_set(&sched->w_sessions,session);
		wait_point_wakeup(&session->snd.wp);
	}
	wait_point_unlock(&session->snd.wp);
	
	wait_point_lock(&session->rcv.wp);
	if (wait_point_check(&session->rcv.wp,time)){
		session_set_set(&sched->r_sessions,session);
		wait_point_wakeup(&session->rcv.wp);
	}
	wait_point_unlock(&session->rcv.wp);
}

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void rtp_session_set_reuseaddr(RtpSession *session, bool_t yes) {
	session->reuseaddr=yes;
}