client-sdk-rust/crates/livekit-webrtc/libwebrtc-sys/src/peer_connection.cpp

//
// Created by Théo Monnom on 30/08/2022.
//

#include "livekit/peer_connection.h"
#include "libwebrtc-sys/src/peer_connection.rs.h"
#include "livekit/rtc_error.h"

namespace livekit {

    inline webrtc::PeerConnectionInterface::RTCOfferAnswerOptions toNativeOfferAnswerOptions(const RTCOfferAnswerOptions& options) {
        webrtc::PeerConnectionInterface::RTCOfferAnswerOptions rtc_options;
        rtc_options.offer_to_receive_video =  options.offer_to_receive_video;
        rtc_options.offer_to_receive_audio =  options.offer_to_receive_audio;
        rtc_options.voice_activity_detection = options.voice_activity_detection;
        rtc_options.ice_restart = options.ice_restart;
        rtc_options.use_rtp_mux = options.use_rtp_mux;
        rtc_options.raw_packetization_for_video = options.raw_packetization_for_video;
        rtc_options.num_simulcast_layers = options.num_simulcast_layers;
        rtc_options.use_obsolete_sctp_sdp = options.use_obsolete_sctp_sdp;
        return rtc_options;
    }

    PeerConnection::PeerConnection(rtc::scoped_refptr<webrtc::PeerConnectionInterface> peer_connection) : peer_connection_(std::move(peer_connection)) {

    }

    void PeerConnection::create_offer(NativeCreateSdpObserverHandle &observer_handle, RTCOfferAnswerOptions options) {
        peer_connection_->CreateOffer(observer_handle.observer.get(), toNativeOfferAnswerOptions(options));
    }

    void PeerConnection::create_answer(NativeCreateSdpObserverHandle &observer_handle, RTCOfferAnswerOptions options) {
        peer_connection_->CreateAnswer(observer_handle.observer.get(), toNativeOfferAnswerOptions(options));
    }

    void PeerConnection::set_local_description(std::unique_ptr<SessionDescription> desc, NativeSetLocalSdpObserverHandle &observer) {
        peer_connection_->SetLocalDescription(desc->clone()->release(), observer.observer);
    }

    void PeerConnection::set_remote_description(std::unique_ptr<SessionDescription> desc, NativeSetRemoteSdpObserverHandle &observer) {
        peer_connection_->SetRemoteDescription(desc->clone()->release(), observer.observer);
    }

    std::unique_ptr<DataChannel> PeerConnection::create_data_channel(rust::String label, std::unique_ptr<NativeDataChannelInit> init) {
        auto result = peer_connection_->CreateDataChannelOrError(label.c_str(), init.get());

        if(!result.ok()) {
            throw std::runtime_error(serialize_error(to_error(result.error())));
        }

        return std::make_unique<DataChannel>(result.value());
    }

    void PeerConnection::add_ice_candidate(std::unique_ptr<IceCandidate> candidate, NativeAddIceCandidateObserver &observer){
        peer_connection_->AddIceCandidate(candidate->release(), [&](const webrtc::RTCError& err){
            observer.OnComplete(to_error(err));
        });
    }

    void PeerConnection::close() {
        peer_connection_->Close();
    }

    // AddIceCandidateObserver

    NativeAddIceCandidateObserver::NativeAddIceCandidateObserver(rust::Box<AddIceCandidateObserverWrapper> observer) : observer_(std::move(observer)) {

    }

    void NativeAddIceCandidateObserver::OnComplete(const RTCError &error) {
        observer_->on_complete(error);
    }

    std::unique_ptr<NativeAddIceCandidateObserver> create_native_add_ice_candidate_observer(rust::Box<AddIceCandidateObserverWrapper> observer) {
        return std::make_unique<NativeAddIceCandidateObserver>(std::move(observer));
    }

    // PeerConnectionObserver

    NativePeerConnectionObserver::NativePeerConnectionObserver(rust::Box<PeerConnectionObserverWrapper> observer) : observer_(std::move(observer)) {

    }

    void NativePeerConnectionObserver::OnSignalingChange(webrtc::PeerConnectionInterface::SignalingState new_state) {
        observer_->on_signaling_change(static_cast<SignalingState>(new_state));
    }

    void NativePeerConnectionObserver::OnAddStream(rtc::scoped_refptr<webrtc::MediaStreamInterface> stream) {
        observer_->on_add_stream(std::make_unique<MediaStreamInterface>(stream));
    }

    void NativePeerConnectionObserver::OnRemoveStream(rtc::scoped_refptr<webrtc::MediaStreamInterface> stream) {
        observer_->on_remove_stream(std::make_unique<MediaStreamInterface>(stream));
    }

    void NativePeerConnectionObserver::OnDataChannel(rtc::scoped_refptr<webrtc::DataChannelInterface> data_channel) {
        observer_->on_data_channel(std::make_unique<DataChannel>(data_channel));
    }

    void NativePeerConnectionObserver::OnRenegotiationNeeded() {
        observer_->on_renegotiation_needed();
    }

    void NativePeerConnectionObserver::OnNegotiationNeededEvent(uint32_t event_id) {
        observer_->on_negotiation_needed_event(event_id);
    }

    void
    NativePeerConnectionObserver::OnIceConnectionChange(webrtc::PeerConnectionInterface::IceConnectionState new_state) {
        observer_->on_ice_connection_change(static_cast<IceConnectionState>(new_state));
    }

    void NativePeerConnectionObserver::OnStandardizedIceConnectionChange(
            webrtc::PeerConnectionInterface::IceConnectionState new_state) {
        observer_->on_standardized_ice_connection_change(static_cast<IceConnectionState>(new_state));
    }

    void
    NativePeerConnectionObserver::OnConnectionChange(webrtc::PeerConnectionInterface::PeerConnectionState new_state) {
        observer_->on_connection_change(static_cast<PeerConnectionState>(new_state));
    }

    void
    NativePeerConnectionObserver::OnIceGatheringChange(webrtc::PeerConnectionInterface::IceGatheringState new_state) {
        observer_->on_ice_gathering_change(static_cast<IceGatheringState>(new_state));
    }

    void NativePeerConnectionObserver::OnIceCandidate(const webrtc::IceCandidateInterface *candidate) {
        auto new_candidate = webrtc::CreateIceCandidate(candidate->sdp_mid(), candidate->sdp_mline_index(),
                                                        candidate->candidate());
        observer_->on_ice_candidate(std::make_unique<IceCandidate>(std::move(new_candidate)));
    }

    void NativePeerConnectionObserver::OnIceCandidateError(const std::string &address, int port, const std::string &url,
                                                           int error_code, const std::string &error_text) {
        observer_->on_ice_candidate_error(address, port, url, error_code, error_text);
    }

    void NativePeerConnectionObserver::OnIceCandidatesRemoved(const std::vector<cricket::Candidate> &candidates) {
        rust::Vec<CandidatePtr> vec;

        for (const auto &item: candidates) {
            vec.push_back(CandidatePtr{
                    std::make_unique<Candidate>(item)
            });
        }

        observer_->on_ice_candidates_removed(std::move(vec));
    }

    void NativePeerConnectionObserver::OnIceConnectionReceivingChange(bool receiving) {
        observer_->on_ice_connection_receiving_change(receiving);
    }

    void
    NativePeerConnectionObserver::OnIceSelectedCandidatePairChanged(const cricket::CandidatePairChangeEvent &event) {
        CandidatePairChangeEvent e;
        e.selected_candidate_pair.local = std::make_unique<Candidate>(event.selected_candidate_pair.local);
        e.selected_candidate_pair.remote = std::make_unique<Candidate>(event.selected_candidate_pair.remote);
        e.last_data_received_ms = event.last_data_received_ms;
        e.reason = event.reason;
        e.estimated_disconnected_time_ms = event.estimated_disconnected_time_ms;

        observer_->on_ice_selected_candidate_pair_changed(std::move(e));
    }

    void NativePeerConnectionObserver::OnAddTrack(rtc::scoped_refptr<webrtc::RtpReceiverInterface> receiver,
                                                  const std::vector<rtc::scoped_refptr<webrtc::MediaStreamInterface>> &streams) {
        rust::Vec<MediaStreamPtr> vec;

        for (const auto &item: streams) {
            vec.push_back(MediaStreamPtr{
                    std::make_unique<MediaStreamInterface>(item)
            });
        }

        observer_->on_add_track(std::make_unique<RtpReceiver>(receiver), std::move(vec));
    }

    void NativePeerConnectionObserver::OnTrack(rtc::scoped_refptr<webrtc::RtpTransceiverInterface> transceiver) {
        observer_->on_track(std::make_unique<RtpTransceiver>(transceiver));
    }

    void NativePeerConnectionObserver::OnRemoveTrack(rtc::scoped_refptr<webrtc::RtpReceiverInterface> receiver) {
        observer_->on_remove_track(std::make_unique<RtpReceiver>(receiver));
    }

    void NativePeerConnectionObserver::OnInterestingUsage(int usage_pattern) {
        observer_->on_interesting_usage(usage_pattern);
    }

    std::unique_ptr<NativePeerConnectionObserver> create_native_peer_connection_observer(rust::Box<PeerConnectionObserverWrapper> observer) {
        return std::make_unique<NativePeerConnectionObserver>(std::move(observer));
    }
} // livekit