int AmSession::onSdpCompleted(const AmSdp& local_sdp, const AmSdp& remote_sdp)
{
DBG("AmSession::onSdpCompleted(...) ...\n");
if(local_sdp.media.empty() || remote_sdp.media.empty()) {
ERROR("Invalid SDP");
string debug_str;
local_sdp.print(debug_str);
ERROR("Local SDP:\n%s",
debug_str.empty() ? "<empty>"
: debug_str.c_str());
remote_sdp.print(debug_str);
ERROR("Remote SDP:\n%s",
debug_str.empty() ? "<empty>"
: debug_str.c_str());
return -1;
}
bool set_on_hold = false;
if (!remote_sdp.media.empty()) {
vector<SdpAttribute>::const_iterator pos =
std::find(remote_sdp.media[0].attributes.begin(), remote_sdp.media[0].attributes.end(), SdpAttribute("sendonly"));
set_on_hold = pos != remote_sdp.media[0].attributes.end();
}
lockAudio();
// TODO:
// - get the right media ID
// - check if the stream coresponding to the media ID
// should be created or updated
//
int ret = 0;
try {
ret = RTPStream()->init(local_sdp, remote_sdp, AmConfig::ForceSymmetricRtp);
} catch (const string& s) {
ERROR("Error while initializing RTP stream: '%s'\n", s.c_str());
ret = -1;
} catch (...) {
ERROR("Error while initializing RTP stream (unknown exception in AmRTPStream::init)\n");
ret = -1;
}
unlockAudio();
if (!isProcessingMedia()) {
setInbandDetector(AmConfig::DefaultDTMFDetector);
}
return ret;
}
int DSMCall::onSdpCompleted(const AmSdp& offer, const AmSdp& answer)
{
AmMimeBody* sdp_body = invite_req.body.hasContentType(SIP_APPLICATION_SDP);
if(!sdp_body) {
sdp_body = invite_req.body.addPart(SIP_APPLICATION_SDP);
}
if(sdp_body) {
string sdp_buf;
answer.print(sdp_buf);
sdp_body->setPayload((const unsigned char*)sdp_buf.c_str(),
sdp_buf.length());
}
return AmB2BCallerSession::onSdpCompleted(offer,answer);
}
int AmRtpStream::init(const AmSdp& local,
const AmSdp& remote,
bool force_passive_mode)
{
if((sdp_media_index < 0) ||
((unsigned)sdp_media_index >= local.media.size()) ||
((unsigned)sdp_media_index >= remote.media.size()) ) {
ERROR("Media index %i is invalid, either within local or remote SDP (or both)",sdp_media_index);
return -1;
}
const SdpMedia& local_media = local.media[sdp_media_index];
const SdpMedia& remote_media = remote.media[sdp_media_index];
payloads.clear();
pl_map.clear();
payloads.resize(local_media.payloads.size());
int i=0;
vector<SdpPayload>::const_iterator sdp_it = local_media.payloads.begin();
vector<Payload>::iterator p_it = payloads.begin();
// first pass on local SDP - fill pl_map with intersection of codecs
while(sdp_it != local_media.payloads.end()) {
int int_pt = payload_provider->getDynPayload(sdp_it->encoding_name,
sdp_it->clock_rate,
sdp_it->encoding_param);
amci_payload_t* a_pl = NULL;
if(int_pt >= 0)
a_pl = payload_provider->payload(int_pt);
if(a_pl == NULL){
if (relay_payloads.get(sdp_it->payload_type)) {
// this payload should be relayed, ignore
++sdp_it;
continue;
} else {
ERROR("No internal payload corresponding to type %s/%i (ignoring)\n",
sdp_it->encoding_name.c_str(),
sdp_it->clock_rate);
// ignore this payload
++sdp_it;
continue;
}
};
p_it->pt = sdp_it->payload_type;
p_it->name = sdp_it->encoding_name;
p_it->codec_id = a_pl->codec_id;
p_it->clock_rate = a_pl->sample_rate;
p_it->advertised_clock_rate = sdp_it->clock_rate;
pl_map[sdp_it->payload_type].index = i;
pl_map[sdp_it->payload_type].remote_pt = -1;
++p_it;
++sdp_it;
++i;
}
// remove payloads which were not initialised (because of unknown payloads
// which are to be relayed)
if (p_it != payloads.end()) payloads.erase(p_it, payloads.end());
// second pass on remote SDP - initialize payload IDs used by remote (remote_pt)
sdp_it = remote_media.payloads.begin();
while(sdp_it != remote_media.payloads.end()) {
// TODO: match not only on encoding name
// but also on parameters, if necessary
// Some codecs define multiple payloads
// with different encoding parameters
PayloadMappingTable::iterator pmt_it = pl_map.end();
if(sdp_it->encoding_name.empty()){ // must be a static payload
pmt_it = pl_map.find(sdp_it->payload_type);
}
else {
for(p_it = payloads.begin(); p_it != payloads.end(); ++p_it){
if(!strcasecmp(p_it->name.c_str(),sdp_it->encoding_name.c_str()) &&
(p_it->advertised_clock_rate == (unsigned int)sdp_it->clock_rate)){
pmt_it = pl_map.find(p_it->pt);
break;
}
}
}
// TODO: remove following code once proper
// payload matching is implemented
//
// initialize remote_pt if not already there
if(pmt_it != pl_map.end() && (pmt_it->second.remote_pt < 0)){
pmt_it->second.remote_pt = sdp_it->payload_type;
}
++sdp_it;
}
if(!l_port){
// only if socket not yet bound:
// set local address - media c-line having precedence over session c-line
if (local_media.conn.address.empty())
setLocalIP(local.conn.address);
else
setLocalIP(local_media.conn.address);
}
setPassiveMode(remote_media.dir == SdpMedia::DirActive || force_passive_mode);
// set remote address - media c-line having precedence over session c-line
if (remote.conn.address.empty() && remote_media.conn.address.empty()) {
WARN("no c= line given globally or in m= section in remote SDP\n");
return -1;
}
if (remote_media.conn.address.empty())
setRAddr(remote.conn.address, remote_media.port);
else
setRAddr(remote_media.conn.address, remote_media.port);
if(local_media.payloads.empty()) {
ERROR("local_media.payloads.empty()\n");
return -1;
}
payload = getDefaultPT();
if(payload < 0) {
ERROR("could not set a default payload\n");
return -1;
}
DBG("default payload selected = %i\n",payload);
last_payload = payload;
remote_telephone_event_pt.reset(remote.telephoneEventPayload());
if (remote_telephone_event_pt.get()) {
DBG("remote party supports telephone events (pt=%i)\n",
remote_telephone_event_pt->payload_type);
} else {
DBG("remote party doesn't support telephone events\n");
}
local_telephone_event_pt.reset(local.telephoneEventPayload());
if(local_media.recv) {
resume();
}
else {
pause();
}
if(local_media.send && !hold
&& (remote_media.port != 0)
#ifndef SUPPORT_IPV6
&& (r_saddr.sin_addr.s_addr != 0)
#endif
) {
mute = false;
}
else {
mute = true;
}
#ifdef WITH_ZRTP
if( session->zrtp_audio ) {
DBG("now starting zrtp stream...\n");
zrtp_start_stream( session->zrtp_audio );
}
#endif
active = false; // mark as nothing received yet
return 0;
}