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/*
The oRTP library is an RTP (Realtime Transport Protocol - rfc1889) 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
*/
/***************************************************************************
* rtcp.c
*
* Wed Dec 1 11:45:30 2004
* Copyright 2004 Simon Morlat
* Email simon dot morlat at linphone dot org
****************************************************************************/
#include <rtpsession.h>
#include <rtcp.h>
extern gint ortp_rtcp_send (RtpSession * session, mblk_t * m);
void rtcp_common_header_init(rtcp_common_header_t *ch, RtpSession *s,int type, int rc, int bytes_len){
rtcp_common_header_set_version(ch,2);
rtcp_common_header_set_padbit(ch,0);
rtcp_common_header_set_packet_type(ch,type);
rtcp_common_header_set_rc(ch,rc); /* as we don't yet support multi source receiving */
rtcp_common_header_set_length(ch,(bytes_len/4)-1);
}
mblk_t *sdes_chunk_new(guint32 ssrc){
mblk_t *m=allocb(RTCP_SDES_CHUNK_DEFAULT_SIZE,0);
sdes_chunk_t *sc=(sdes_chunk_t*)m->b_rptr;
sc->csrc=htonl(ssrc);
m->b_wptr+=sizeof(sc->csrc);
return m;
}
mblk_t * sdes_chunk_append_item(mblk_t *m, rtcp_sdes_type_t sdes_type, const gchar *content)
{
if ( content )
{
sdes_item_t si;
si.item_type=sdes_type;
si.len=MIN(strlen(content),RTCP_SDES_MAX_STRING_SIZE);
m=appendb(m,(char*)&si,RTCP_SDES_ITEM_HEADER_SIZE,FALSE);
m=appendb(m,content,si.len,FALSE);
}
return m;
}
void sdes_chunk_set_ssrc(mblk_t *m, guint32 ssrc){
sdes_chunk_t *sc=(sdes_chunk_t*)m->b_rptr;
sc->csrc=htonl(ssrc);
}
#define sdes_chunk_get_ssrc(m) ntohl(((sdes_chunk_t*)((m)->b_rptr))->csrc)
mblk_t * sdes_chunk_pad(mblk_t *m){
return appendb(m,NULL,0,TRUE);
}
void rtp_session_set_source_description(RtpSession *session,
const gchar *cname, const gchar *name, const gchar *email, const gchar *phone,
const gchar *loc, const gchar *tool, const gchar *note){
mblk_t *chunk = sdes_chunk_new(session->send_ssrc);
mblk_t *m=chunk;
const gchar *_cname=cname;
if (_cname==NULL)
{
_cname="Unknown";
}
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_CNAME, _cname);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_NAME, name);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_EMAIL, email);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_PHONE, phone);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_LOC, loc);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_TOOL, tool);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_NOTE, note);
chunk=sdes_chunk_pad(chunk);
rtp_session_lock(session);
if (session->sd!=NULL) freemsg(session->sd);
session->sd=m;
rtp_session_unlock(session);
}
void
rtp_session_add_contributing_source(RtpSession *session, guint32 csrc,
const gchar *cname, const gchar *name, const gchar *email, const gchar *phone,
const gchar *loc, const gchar *tool, const gchar *note)
{
mblk_t *chunk = sdes_chunk_new(csrc);
mblk_t *m=chunk;
gchar *_cname=(gchar*)cname;
if (_cname==NULL)
{
_cname="toto";
}
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_CNAME, cname);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_NAME, name);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_EMAIL, email);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_PHONE, phone);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_LOC, loc);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_TOOL, tool);
chunk=sdes_chunk_append_item(chunk, RTCP_SDES_NOTE, note);
chunk=sdes_chunk_pad(chunk);
rtp_session_lock(session);
putq(&session->contributing_sources,m);
rtp_session_unlock(session);
}
mblk_t* rtp_session_create_rtcp_sdes_packet(RtpSession *session)
{
mblk_t *mp=allocb(sizeof(rtcp_common_header_t),0);
rtcp_common_header_t *rtcp;
mblk_t *tmp,*m=mp;
queue_t *q;
int rc=0;
rtcp = (rtcp_common_header_t*)mp->b_wptr;
mp->b_wptr+=sizeof(rtcp_common_header_t);
/* concatenate all sdes chunks */
sdes_chunk_set_ssrc(session->sd,session->send_ssrc);
m=concatb(m,dupmsg(session->sd));
rc++;
q=&session->contributing_sources;
for (tmp=qbegin(q); !qend(q,tmp); tmp=qnext(q,mp)){
m=concatb(m,dupmsg(tmp));
rc++;
}
rtcp_common_header_init(rtcp,session,RTCP_SDES,rc,msgdsize(mp));
return mp;
}
mblk_t *rtcp_create_simple_bye_packet(guint32 ssrc, const gchar *reason)
{
gint strsize=0;
gint packet_size;
mblk_t *mp;
rtcp_bye_t *rtcp;
packet_size = RTCP_BYE_HEADER_SIZE + 1 + strsize;
if (reason!=NULL)
strsize=MIN(strlen(reason),RTCP_BYE_REASON_MAX_STRING_SIZE);
mp = allocb(packet_size, 0);
rtcp = (rtcp_bye_t*)mp->b_rptr;
rtcp_common_header_init(&rtcp->ch,NULL,RTCP_BYE,1,packet_size);
rtcp->ssrc[0] = htonl(ssrc);
mp->b_wptr += packet_size;
/* append the reason if any*/
if (reason!=NULL)
appendb(mp,reason,strsize,FALSE);
return mp;
}
void rtp_session_remove_contributing_sources(RtpSession *session, guint32 ssrc)
{
queue_t *q=&session->contributing_sources;
mblk_t *tmp;
for (tmp=qbegin(q); !qend(q,tmp); tmp=qnext(q,tmp)){
guint32 csrc=sdes_chunk_get_ssrc(tmp);
if (csrc==ssrc) {
remq(q,tmp);
break;
}
}
tmp=rtcp_create_simple_bye_packet(ssrc, NULL);
ortp_rtcp_send(session,tmp);
}
void sender_info_init(sender_info_t *info, RtpSession *session){
struct timeval tv;
guint32 tmp;
gettimeofday(&tv,NULL);
info->ntp_timestamp_msw=htonl(tv.tv_sec);
tmp=(guint32)((double)tv.tv_usec*(double)(1LL<<32)*1.0e-6);
info->ntp_timestamp_lsw=htonl(tmp);
info->rtp_timestamp=htonl(session->rtp.snd_last_ts);
info->senders_packet_count=htonl(session->rtp.stats.packet_sent);
info->senders_octet_count=htonl(session->rtp.stats.sent);
}
void report_block_init(report_block_t *b, RtpSession *session){
guint packet_loss=0;
guint8 loss_fraction=0;
RtpStream *stream=&session->rtp;
guint32 delay_snc_last_sr=0;
/* compute the statistics */
/*printf("hwrcv_extseq.one=%u, hwrcv_seq_at_last_SR=%u hwrcv_since_last_SR=%u\n",
stream->hwrcv_extseq.one,
stream->hwrcv_seq_at_last_SR,
stream->hwrcv_since_last_SR
);*/
if (stream->hwrcv_seq_at_last_SR!=0){
packet_loss=(stream->hwrcv_extseq.one - stream->hwrcv_seq_at_last_SR) - stream->hwrcv_since_last_SR;
stream->stats.cum_packet_loss+=packet_loss;
loss_fraction=(int)(256.0*(float)packet_loss/(float)stream->hwrcv_since_last_SR);
}
/* reset them */
stream->hwrcv_since_last_SR=0;
stream->hwrcv_seq_at_last_SR=stream->hwrcv_extseq.one;
if (stream->last_rcv_SR_time.tv_sec!=0){
struct timeval now;
gfloat delay;
gettimeofday(&now,NULL);
delay=((now.tv_sec-stream->last_rcv_SR_time.tv_sec)*1e6 ) + (now.tv_usec-stream->last_rcv_SR_time.tv_usec);
delay=delay*65536*1e-6;
delay_snc_last_sr=(guint32) delay;
}
b->ssrc=htonl(session->recv_ssrc);
b->fraction_lost=loss_fraction;
b->cum_num_packet_lost=hton24(stream->stats.cum_packet_loss);
b->interarrival_jitter=htonl((guint32) stream->jittctl.inter_jitter);
b->ext_high_seq_num_rec=htonl(stream->hwrcv_extseq.one);
b->lsr=htonl(stream->last_rcv_SR_ts);
b->delay_snc_last_sr=htonl(delay_snc_last_sr);
}
int rtcp_sr_init(RtpSession *session, char *buf, int size){
rtcp_sr_t *sr=(rtcp_sr_t*)buf;
if (size<sizeof(rtcp_sr_t)) return -1;
rtcp_common_header_init(&sr->ch,session,RTCP_SR,1,sizeof(rtcp_sr_t));
sr->ssrc=htonl(session->send_ssrc);
sender_info_init(&sr->si,session);
report_block_init(&sr->rb[0],session);
return sizeof(rtcp_sr_t);
}
int rtcp_rr_init(RtpSession *session, char *buf, int size){
rtcp_rr_t *rr=(rtcp_rr_t*)buf;
if (size<sizeof(rtcp_rr_t)) return -1;
rtcp_common_header_init(&rr->ch,session,RTCP_RR,1,sizeof(rtcp_sr_t));
rr->ssrc=htonl(session->send_ssrc);
report_block_init(&rr->rb[0],session);
return sizeof(rtcp_sr_t);
}
void __rtp_session_rtcp_process(RtpSession *session){
mblk_t *cm=NULL;
mblk_t *sdes=NULL;
if (session->mode==RTP_SESSION_SENDONLY || session->mode==RTP_SESSION_SENDRECV){
/* first make a SR packet */
cm=allocb(sizeof(rtcp_sr_t),0);
cm->b_wptr+=rtcp_sr_init(session,cm->b_wptr,sizeof(rtcp_sr_t));
/* make a SDES packet */
sdes=rtp_session_create_rtcp_sdes_packet(session);
/* link them */
cm->b_cont=sdes;
}else{
/* make a RR packet */
cm=allocb(sizeof(rtcp_rr_t),0);
cm->b_wptr+=rtcp_rr_init(session,cm->b_wptr,sizeof(rtcp_rr_t));
/* if we are recv-only do we need to add SDES packet ? I don't think so
as we are not a source */
}
/* send the compound packet */
ortp_rtcp_send(session,cm);
ortp_debug("Rtcp compound message sent.");
}
void rtp_session_rtcp_process(RtpSession *session){
RtpStream *st=&session->rtp;
if (st->rcv_last_app_ts - st->last_rtcp_report_snt_r > st->rtcp_report_snt_interval
|| st->snd_last_ts - st->last_rtcp_report_snt_s > st->rtcp_report_snt_interval){
st->last_rtcp_report_snt_r=st->rcv_last_app_ts;
st->last_rtcp_report_snt_s=st->snd_last_ts;
__rtp_session_rtcp_process(session);
}
}
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