void
JsepTrack::Negotiate(const SdpMediaSection& answer,
const SdpMediaSection& remote)
{
PtrVector<JsepCodecDescription> negotiatedCodecs;
negotiatedCodecs.values = GetCodecClones();
std::map<std::string, std::string> formatChanges;
NegotiateCodecs(remote,
&negotiatedCodecs.values,
&formatChanges);
// Use |formatChanges| to update mPrototypeCodecs
size_t insertPos = 0;
for (size_t i = 0; i < mPrototypeCodecs.values.size(); ++i) {
if (formatChanges.count(mPrototypeCodecs.values[i]->mDefaultPt)) {
// Update the payload type to what was negotiated
mPrototypeCodecs.values[i]->mDefaultPt =
formatChanges[mPrototypeCodecs.values[i]->mDefaultPt];
// Move this negotiated codec up front
std::swap(mPrototypeCodecs.values[insertPos],
mPrototypeCodecs.values[i]);
++insertPos;
}
}
EnsureNoDuplicatePayloadTypes(&mPrototypeCodecs.values);
UniquePtr<JsepTrackNegotiatedDetails> negotiatedDetails =
MakeUnique<JsepTrackNegotiatedDetails>();
CreateEncodings(remote, negotiatedCodecs.values, negotiatedDetails.get());
if (answer.GetAttributeList().HasAttribute(SdpAttribute::kExtmapAttribute)) {
for (auto& extmapAttr : answer.GetAttributeList().GetExtmap().mExtmaps) {
negotiatedDetails->mExtmap[extmapAttr.extensionname] = extmapAttr;
}
}
if (mDirection == sdp::kRecv) {
mSsrcs.clear();
if (remote.GetAttributeList().HasAttribute(SdpAttribute::kSsrcAttribute)) {
for (auto& ssrcAttr : remote.GetAttributeList().GetSsrc().mSsrcs) {
AddSsrc(ssrcAttr.ssrc);
}
}
}
mNegotiatedDetails = Move(negotiatedDetails);
}
void
JsepTrack::AddToAnswer(const SdpMediaSection& offer,
SdpMediaSection* answer) const
{
// We do not modify mPrototypeCodecs here, since we're only creating an
// answer. Once offer/answer concludes, we will update mPrototypeCodecs.
PtrVector<JsepCodecDescription> codecs;
codecs.values = GetCodecClones();
NegotiateCodecs(offer, &codecs.values);
if (codecs.values.empty()) {
return;
}
AddToMsection(codecs.values, answer);
if (mDirection == sdp::kSend) {
std::vector<JsConstraints> constraints;
std::vector<SdpRidAttributeList::Rid> rids;
GetRids(offer, sdp::kRecv, &rids);
NegotiateRids(rids, &constraints);
AddToMsection(constraints, sdp::kSend, answer);
}
}
