Support voice calls

src/WebRTCSession.h

@@ -0,0 +1,58 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <QObject>
+
+#include "mtx/events/voip.hpp"
+
+typedef struct _GstElement GstElement;
+
+class WebRTCSession : public QObject
+{
+        Q_OBJECT
+
+public:
+        static WebRTCSession& instance()
+        {
+          static WebRTCSession instance;
+          return instance;
+        }
+
+        bool init(std::string *errorMessage = nullptr);
+
+        bool createOffer();
+        bool acceptOffer(const std::string &sdp);
+        bool acceptAnswer(const std::string &sdp);
+        void acceptICECandidates(const std::vector<mtx::events::msg::CallCandidates::Candidate>&);
+
+        bool isActive() { return pipe_ != nullptr; }
+        bool toggleMuteAudioSrc(bool &isMuted);
+        void end();
+
+        void setStunServer(const std::string &stunServer) {stunServer_ = stunServer;}
+        void setTurnServers(const std::vector<std::string> &uris) {turnServers_ = uris;}
+
+signals:
+        void offerCreated(const std::string &sdp, const std::vector<mtx::events::msg::CallCandidates::Candidate>&);
+        void answerCreated(const std::string &sdp, const std::vector<mtx::events::msg::CallCandidates::Candidate>&);
+        void pipelineChanged(bool started);
+
+private:
+        WebRTCSession() : QObject() {}
+
+        bool initialised_ = false;
+        GstElement *pipe_ = nullptr;
+        GstElement *webrtc_ = nullptr;
+        std::string stunServer_;
+        std::vector<std::string> turnServers_;
+
+        bool startPipeline(int opusPayloadType);
+        bool createPipeline(int opusPayloadType);
+        void addTurnServers();
+
+public:
+        WebRTCSession(WebRTCSession const&) = delete;
+        void operator=(WebRTCSession const&) = delete;
+};