Add support for unencrypted RTP calls to libdino

Co-authored-by: Marvin W <git@larma.de>

13 files changed, 811 insertions, 7 deletions

diff --git a/libdino/src/application.vala b/libdino/src/application.vala
index c1fd7e39..f381c21d 100644
--- a/libdino/src/application.vala
+++ b/libdino/src/application.vala
@@ -39,6 +39,8 @@ public interface Application : GLib.Application {
         AvatarManager.start(stream_interactor, db);
         RosterManager.start(stream_interactor, db);
         FileManager.start(stream_interactor, db);
+        Calls.start(stream_interactor, db);
+        CallStore.start(stream_interactor, db);
         ContentItemStore.start(stream_interactor, db);
         ChatInteraction.start(stream_interactor);
         NotificationEvents.start(stream_interactor);
diff --git a/libdino/src/entity/call.vala b/libdino/src/entity/call.vala
new file mode 100644
index 00000000..b836e2cd
--- /dev/null
+++ b/libdino/src/entity/call.vala
@@ -0,0 +1,126 @@
+using Xmpp;
+
+namespace Dino.Entities {
+
+    public class Call : Object {
+
+        public const bool DIRECTION_OUTGOING = true;
+        public const bool DIRECTION_INCOMING = false;
+
+        public enum State {
+            RINGING,
+            ESTABLISHING,
+            IN_PROGRESS,
+            OTHER_DEVICE_ACCEPTED,
+            ENDED,
+            DECLINED,
+            MISSED,
+            FAILED
+        }
+
+        public int id { get; set; default=-1; }
+        public Account account { get; set; }
+        public Jid counterpart { get; set; }
+        public Jid ourpart { get; set; }
+        public Jid? from {
+            get { return direction == DIRECTION_OUTGOING ? ourpart : counterpart; }
+        }
+        public Jid? to {
+            get { return direction == DIRECTION_OUTGOING ? counterpart : ourpart; }
+        }
+        public bool direction { get; set; }
+        public DateTime time { get; set; }
+        public DateTime local_time { get; set; }
+        public DateTime end_time { get; set; }
+
+        public State state { get; set; }
+
+        private Database? db;
+
+        public Call.from_row(Database db, Qlite.Row row) throws InvalidJidError {
+            this.db = db;
+
+            id = row[db.call.id];
+            account = db.get_account_by_id(row[db.call.account_id]);
+
+            counterpart = db.get_jid_by_id(row[db.call.counterpart_id]);
+            string counterpart_resource = row[db.call.counterpart_resource];
+            if (counterpart_resource != null) counterpart = counterpart.with_resource(counterpart_resource);
+
+            string our_resource = row[db.call.our_resource];
+            if (our_resource != null) {
+                ourpart = account.bare_jid.with_resource(our_resource);
+            } else {
+                ourpart = account.bare_jid;
+            }
+            direction = row[db.call.direction];
+            time = new DateTime.from_unix_utc(row[db.call.time]);
+            local_time = new DateTime.from_unix_utc(row[db.call.local_time]);
+            end_time = new DateTime.from_unix_utc(row[db.call.end_time]);
+            state = (State) row[db.call.state];
+
+            notify.connect(on_update);
+        }
+
+        public void persist(Database db) {
+            if (id != -1) return;
+
+            this.db = db;
+            Qlite.InsertBuilder builder = db.call.insert()
+                    .value(db.call.account_id, account.id)
+                    .value(db.call.counterpart_id, db.get_jid_id(counterpart))
+                    .value(db.call.counterpart_resource, counterpart.resourcepart)
+                    .value(db.call.our_resource, ourpart.resourcepart)
+                    .value(db.call.direction, direction)
+                    .value(db.call.time, (long) time.to_unix())
+                    .value(db.call.local_time, (long) local_time.to_unix())
+                    .value(db.call.state, State.ENDED); // No point in persisting states that can't survive a restart
+            if (end_time != null) {
+                builder.value(db.call.end_time, (long) end_time.to_unix());
+            }
+            id = (int) builder.perform();
+
+            notify.connect(on_update);
+        }
+
+        public bool equals(Call c) {
+            return equals_func(this, c);
+        }
+
+        public static bool equals_func(Call c1, Call c2) {
+            if (c1.id == c2.id) {
+                return true;
+            }
+            return false;
+        }
+
+        public static uint hash_func(Call call) {
+            return (uint)call.id;
+        }
+
+        private void on_update(Object o, ParamSpec sp) {
+            Qlite.UpdateBuilder update_builder = db.call.update().with(db.call.id, "=", id);
+            switch (sp.name) {
+                case "counterpart":
+                    update_builder.set(db.call.counterpart_id, db.get_jid_id(counterpart));
+                    update_builder.set(db.call.counterpart_resource, counterpart.resourcepart); break;
+                case "ourpart":
+                    update_builder.set(db.call.our_resource, ourpart.resourcepart); break;
+                case "direction":
+                    update_builder.set(db.call.direction, direction); break;
+                case "time":
+                    update_builder.set(db.call.time, (long) time.to_unix()); break;
+                case "local-time":
+                    update_builder.set(db.call.local_time, (long) local_time.to_unix()); break;
+                case "end-time":
+                    update_builder.set(db.call.end_time, (long) end_time.to_unix()); break;
+                case "state":
+                    // No point in persisting states that can't survive a restart
+                    if (state == State.RINGING || state == State.ESTABLISHING || state == State.IN_PROGRESS) return;
+                    update_builder.set(db.call.state, state);
+                    break;
+            }
+            update_builder.perform();
+        }
+    }
+}
diff --git a/libdino/src/plugin/interfaces.vala b/libdino/src/plugin/interfaces.vala
index dab058af..8be77895 100644
--- a/libdino/src/plugin/interfaces.vala
+++ b/libdino/src/plugin/interfaces.vala
@@ -84,6 +84,31 @@ public abstract interface ConversationAdditionPopulator : ConversationItemPopula
     public virtual void populate_timespan(Conversation conversation, DateTime from, DateTime to) { }
 }
 
+public abstract interface VideoCallPlugin : Object {
+    // Video widget
+    public abstract VideoCallWidget? create_widget(WidgetType type);
+
+    // Devices
+    public signal void devices_changed(string media, bool incoming);
+    public abstract Gee.List<MediaDevice> get_devices(string media, bool incoming);
+    public abstract MediaDevice? get_device(Xmpp.Xep.JingleRtp.Stream stream, bool incoming);
+    public abstract void set_pause(Xmpp.Xep.JingleRtp.Stream stream, bool pause);
+    public abstract void set_device(Xmpp.Xep.JingleRtp.Stream stream, MediaDevice? device);
+}
+
+public abstract interface VideoCallWidget : Object {
+    public signal void resolution_changed(uint width, uint height);
+    public abstract void display_stream(Xmpp.Xep.JingleRtp.Stream stream); // TODO: Multi participant
+    public abstract void display_device(MediaDevice device);
+    public abstract void detach();
+}
+
+public abstract interface MediaDevice : Object {
+    public abstract string id { get; }
+    public abstract string display_name { get; }
+    public abstract string detail_name { get; }
+}
+
 public abstract interface NotificationPopulator : Object {
     public abstract string id { get; }
     public abstract void init(Conversation conversation, NotificationCollection summary, WidgetType type);
diff --git a/libdino/src/plugin/loader.vala b/libdino/src/plugin/loader.vala
index 102bf3f9..8b0d93ad 100644
--- a/libdino/src/plugin/loader.vala
+++ b/libdino/src/plugin/loader.vala
@@ -26,7 +26,7 @@ public class Loader : Object {
         this.search_paths = app.search_path_generator.get_plugin_paths();
     }
 
-    public void loadAll() throws Error {
+    public void load_all() throws Error {
         if (Module.supported() == false) {
             throw new Error(-1, 0, "Plugins are not supported");
         }
diff --git a/libdino/src/plugin/registry.vala b/libdino/src/plugin/registry.vala
index e3f73855..27d72b80 100644
--- a/libdino/src/plugin/registry.vala
+++ b/libdino/src/plugin/registry.vala
@@ -12,6 +12,7 @@ public class Registry {
     internal Gee.Collection<ConversationTitlebarEntry> conversation_titlebar_entries = new Gee.TreeSet<ConversationTitlebarEntry>((a, b) => {
         return (int)(a.order - b.order);
     });
+    public VideoCallPlugin? video_call_plugin;
 
     public bool register_encryption_list_entry(EncryptionListEntry entry) {
         lock(encryption_list_entries) {
diff --git a/libdino/src/service/call_store.vala b/libdino/src/service/call_store.vala
new file mode 100644
index 00000000..fa6e63ee
--- /dev/null
+++ b/libdino/src/service/call_store.vala
@@ -0,0 +1,61 @@
+using Xmpp;
+using Gee;
+using Qlite;
+
+using Dino.Entities;
+
+namespace Dino {
+
+    public class CallStore : StreamInteractionModule, Object {
+        public static ModuleIdentity<CallStore> IDENTITY = new ModuleIdentity<CallStore>("call_store");
+        public string id { get { return IDENTITY.id; } }
+
+        private StreamInteractor stream_interactor;
+        private Database db;
+
+        private WeakMap<int, Call> calls_by_db_id = new WeakMap<int, Call>();
+
+        public static void start(StreamInteractor stream_interactor, Database db) {
+            CallStore m = new CallStore(stream_interactor, db);
+            stream_interactor.add_module(m);
+        }
+
+        private CallStore(StreamInteractor stream_interactor, Database db) {
+            this.stream_interactor = stream_interactor;
+            this.db = db;
+        }
+
+        public void add_call(Call call, Conversation conversation) {
+            call.persist(db);
+            cache_call(call);
+        }
+
+        public Call? get_call_by_id(int id) {
+            Call? call = calls_by_db_id[id];
+            if (call != null) {
+                return call;
+            }
+
+            RowOption row_option = db.call.select().with(db.call.id, "=", id).row();
+
+            return create_call_from_row_opt(row_option);
+        }
+
+        private Call? create_call_from_row_opt(RowOption row_opt) {
+            if (!row_opt.is_present()) return null;
+
+            try {
+                Call call = new Call.from_row(db, row_opt.inner);
+                cache_call(call);
+                return call;
+            } catch (InvalidJidError e) {
+                warning("Got message with invalid Jid: %s", e.message);
+            }
+            return null;
+        }
+
+        private void cache_call(Call call) {
+            calls_by_db_id[call.id] = call;
+        }
+    }
+}
\ No newline at end of file
diff --git a/libdino/src/service/calls.vala b/libdino/src/service/calls.vala
new file mode 100644
index 00000000..5224bdd1
--- /dev/null
+++ b/libdino/src/service/calls.vala
@@ -0,0 +1,514 @@
+using Gee;
+
+using Xmpp;
+using Dino.Entities;
+
+namespace Dino {
+
+    public class Calls : StreamInteractionModule, Object {
+
+        public signal void call_incoming(Call call, Conversation conversation, bool video);
+        public signal void call_outgoing(Call call, Conversation conversation);
+
+        public signal void call_terminated(Call call, string? reason_name, string? reason_text);
+        public signal void counterpart_ringing(Call call);
+        public signal void counterpart_sends_video_updated(Call call, bool mute);
+        public signal void info_received(Call call, Xep.JingleRtp.CallSessionInfo session_info);
+
+        public signal void stream_created(Call call, string media);
+
+        public static ModuleIdentity<Calls> IDENTITY = new ModuleIdentity<Calls>("calls");
+        public string id { get { return IDENTITY.id; } }
+
+        private StreamInteractor stream_interactor;
+        private Xep.JingleRtp.SessionInfoType session_info_type;
+
+        private HashMap<Account, HashMap<Call, string>> sid_by_call = new HashMap<Account, HashMap<Call, string>>(Account.hash_func, Account.equals_func);
+        private HashMap<Account, HashMap<string, Call>> call_by_sid = new HashMap<Account, HashMap<string, Call>>(Account.hash_func, Account.equals_func);
+        public HashMap<Call, Xep.Jingle.Session> sessions = new HashMap<Call, Xep.Jingle.Session>(Call.hash_func, Call.equals_func);
+
+        public Call? mi_accepted_call = null;
+        public string? mi_accepted_sid = null;
+        public bool mi_accepted_video = false;
+
+        private HashMap<Call, bool> counterpart_sends_video = new HashMap<Call, bool>(Call.hash_func, Call.equals_func);
+        private HashMap<Call, bool> we_should_send_video = new HashMap<Call, bool>(Call.hash_func, Call.equals_func);
+        private HashMap<Call, bool> we_should_send_audio = new HashMap<Call, bool>(Call.hash_func, Call.equals_func);
+
+        private HashMap<Call, Xep.JingleRtp.Parameters> audio_content_parameter = new HashMap<Call, Xep.JingleRtp.Parameters>(Call.hash_func, Call.equals_func);
+        private HashMap<Call, Xep.JingleRtp.Parameters> video_content_parameter = new HashMap<Call, Xep.JingleRtp.Parameters>(Call.hash_func, Call.equals_func);
+        private HashMap<Call, Xep.Jingle.Content> video_content = new HashMap<Call, Xep.Jingle.Content>(Call.hash_func, Call.equals_func);
+
+        public static void start(StreamInteractor stream_interactor, Database db) {
+            Calls m = new Calls(stream_interactor, db);
+            stream_interactor.add_module(m);
+        }
+
+        private Calls(StreamInteractor stream_interactor, Database db) {
+            this.stream_interactor = stream_interactor;
+
+            stream_interactor.account_added.connect(on_account_added);
+        }
+
+        public Xep.JingleRtp.Stream? get_video_stream(Call call) {
+            if (video_content_parameter.has_key(call)) {
+                return video_content_parameter[call].stream;
+            }
+            return null;
+        }
+
+        public Xep.JingleRtp.Stream? get_audio_stream(Call call) {
+            if (audio_content_parameter.has_key(call)) {
+                return audio_content_parameter[call].stream;
+            }
+            return null;
+        }
+
+        public async Call? initiate_call(Conversation conversation, bool video) {
+            Call call = new Call();
+            call.direction = Call.DIRECTION_OUTGOING;
+            call.account = conversation.account;
+            call.counterpart = conversation.counterpart;
+            call.ourpart = conversation.account.full_jid;
+            call.time = call.local_time = new DateTime.now_utc();
+            call.state = Call.State.RINGING;
+
+            stream_interactor.get_module(CallStore.IDENTITY).add_call(call, conversation);
+
+            XmppStream? stream = stream_interactor.get_stream(conversation.account);
+            if (stream == null) return null;
+
+            Gee.List<Jid> call_resources = yield get_call_resources(conversation);
+            if (call_resources.size > 0) {
+                Jid full_jid = call_resources[0];
+                Xep.Jingle.Session session = yield stream.get_module(Xep.JingleRtp.Module.IDENTITY).start_call(stream, full_jid, video);
+                sessions[call] = session;
+                call_by_sid[call.account][session.sid] = call;
+                sid_by_call[call.account][call] = session.sid;
+
+                connect_session_signals(call, session);
+            }
+
+            we_should_send_video[call] = video;
+            we_should_send_audio[call] = true;
+
+            conversation.last_active = call.time;
+            call_outgoing(call, conversation);
+
+            return call;
+        }
+
+        public void end_call(Conversation conversation, Call call) {
+            XmppStream? stream = stream_interactor.get_stream(call.account);
+            if (stream == null) return;
+
+            if (call.state == Call.State.IN_PROGRESS || call.state == Call.State.ESTABLISHING) {
+                sessions[call].terminate(Xep.Jingle.ReasonElement.SUCCESS, null, "success");
+                call.state = Call.State.ENDED;
+            } else if (call.state == Call.State.RINGING) {
+                if (sessions.has_key(call)) {
+                    sessions[call].terminate(Xep.Jingle.ReasonElement.CANCEL, null, "cancel");
+                } else {
+                    // Only a JMI so far
+                }
+                call.state = Call.State.MISSED;
+            } else {
+                return;
+            }
+
+            call.end_time = new DateTime.now_utc();
+
+            remove_call_from_datastructures(call);
+        }
+
+        public void accept_call(Call call) {
+            call.state = Call.State.ESTABLISHING;
+
+            if (sessions.has_key(call)) {
+                foreach (Xep.Jingle.Content content in sessions[call].contents.values) {
+                    content.accept();
+                }
+            } else {
+                // Only a JMI so far
+                XmppStream stream = stream_interactor.get_stream(call.account);
+                if (stream == null) return;
+
+                mi_accepted_call = call;
+                mi_accepted_sid = sid_by_call[call.account][call];
+                mi_accepted_video = we_should_send_video[call];
+
+                stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_accept_to_self(stream, mi_accepted_sid);
+                stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_proceed_to_peer(stream, call.counterpart, mi_accepted_sid);
+            }
+        }
+
+        public void reject_call(Call call) {
+            call.state = Call.State.DECLINED;
+
+            if (sessions.has_key(call)) {
+                foreach (Xep.Jingle.Content content in sessions[call].contents.values) {
+                    content.reject();
+                }
+                remove_call_from_datastructures(call);
+            } else {
+                // Only a JMI so far
+                XmppStream stream = stream_interactor.get_stream(call.account);
+                if (stream == null) return;
+
+                string sid = sid_by_call[call.account][call];
+                stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_reject_to_self(stream, sid);
+                stream.get_module(Xep.JingleMessageInitiation.Module.IDENTITY).send_session_reject_to_peer(stream, call.counterpart, sid);
+                remove_call_from_datastructures(call);
+            }
+        }
+
+        public void mute_own_audio(Call call, bool mute) {
+            we_should_send_audio[call] = !mute;
+
+            Xep.JingleRtp.Stream stream = audio_content_parameter[call].stream;
+            // The user might mute audio before a feed was created. The feed will be muted as soon as it has been created.
+            if (stream == null) return;
+
+            // Inform our counterpart that we (un)muted our audio
+            stream_interactor.module_manager.get_module(call.account, Xep.JingleRtp.Module.IDENTITY).session_info_type.send_mute(sessions[call], mute, "audio");
+
+            // Start/Stop sending audio data
+            Application.get_default().plugin_registry.video_call_plugin.set_pause(stream, mute);
+        }
+
+        public void mute_own_video(Call call, bool mute) {
+            we_should_send_video[call] = !mute;
+
+            Xep.JingleRtp.Module rtp_module = stream_interactor.module_manager.get_module(call.account, Xep.JingleRtp.Module.IDENTITY);
+
+            if (video_content_parameter.has_key(call) &&
+                    video_content_parameter[call].stream != null &&
+                    sessions[call].senders_include_us(video_content[call].senders)) {
+                // A video feed has already been established
+
+                // Start/Stop sending video data
+                Xep.JingleRtp.Stream stream = video_content_parameter[call].stream;
+                if (stream != null) {
+                    // TODO maybe the user muted video before the feed was created...
+                    Application.get_default().plugin_registry.video_call_plugin.set_pause(stream, mute);
+                }
+
+                // Inform our counterpart that we started/stopped our video
+                rtp_module.session_info_type.send_mute(sessions[call], mute, "video");
+            } else if (!mute) {
+                // Need to start a new video feed
+                XmppStream stream = stream_interactor.get_stream(call.account);
+                rtp_module.add_outgoing_video_content.begin(stream, sessions[call], (_, res) => {
+                    if (video_content_parameter[call] == null) {
+                        Xep.Jingle.Content content = rtp_module.add_outgoing_video_content.end(res);
+                        Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters;
+                        if (rtp_content_parameter != null) {
+                            connect_content_signals(call, content, rtp_content_parameter);
+                        }
+                    }
+                });
+            }
+            // If video_feed == null && !mute we're trying to mute a non-existant feed. It will be muted as soon as it is created.
+        }
+
+        public async Gee.List<Jid> get_call_resources(Conversation conversation) {
+            ArrayList<Jid> ret = new ArrayList<Jid>();
+
+            XmppStream? stream = stream_interactor.get_stream(conversation.account);
+            if (stream == null) return ret;
+
+            Gee.List<Jid>? full_jids = stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart);
+            if (full_jids == null) return ret;
+
+            foreach (Jid full_jid in full_jids) {
+                bool supports_rtc = yield stream.get_module(Xep.JingleRtp.Module.IDENTITY).is_available(stream, full_jid);
+                if (!supports_rtc) continue;
+
+                // dtls support indicates webRTC support. Clients tend to not do normal ice udp in that case. Except Dino.
+                bool supports_dtls = yield stream_interactor.get_module(EntityInfo.IDENTITY).has_feature(conversation.account, full_jid, "urn:xmpp:jingle:apps:dtls:0");
+                if (supports_dtls) {
+                    Xep.ServiceDiscovery.Identity? identity = yield stream_interactor.get_module(EntityInfo.IDENTITY).get_identity(conversation.account, full_jid);
+                    bool is_dino = identity != null && identity.name == "Dino";
+
+                    if (!is_dino) continue;
+                }
+
+                ret.add(full_jid);
+            }
+            return ret;
+        }
+
+        public bool should_we_send_video(Call call) {
+            return we_should_send_video[call];
+        }
+
+        public Jid? is_call_in_progress() {
+            foreach (Call call in sessions.keys) {
+                if (call.state == Call.State.IN_PROGRESS || call.state == Call.State.RINGING || call.state == Call.State.ESTABLISHING) {
+                    return call.counterpart;
+                }
+            }
+            return null;
+        }
+
+        private void on_incoming_call(Account account, Xep.Jingle.Session session) {
+            bool counterpart_wants_video = false;
+            foreach (Xep.Jingle.Content content in session.contents.values) {
+                Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters;
+                if (rtp_content_parameter == null) continue;
+                if (rtp_content_parameter.media == "video" && session.senders_include_us(content.senders)) {
+                    counterpart_wants_video = true;
+                }
+            }
+
+            // Session might have already been accepted via Jingle Message Initiation
+            bool already_accepted = mi_accepted_sid == session.sid && mi_accepted_call.account.equals(account) &&
+                    mi_accepted_call.counterpart.equals_bare(session.peer_full_jid) &&
+                    mi_accepted_video == counterpart_wants_video;
+
+            Call? call = null;
+            if (already_accepted) {
+                call = mi_accepted_call;
+            } else {
+                call = create_received_call(account, session.peer_full_jid, account.full_jid, counterpart_wants_video);
+            }
+            sessions[call] = session;
+
+            call_by_sid[account][session.sid] = call;
+            sid_by_call[account][call] = session.sid;
+
+            connect_session_signals(call, session);
+
+            if (already_accepted) {
+                accept_call(call);
+            } else {
+                stream_interactor.module_manager.get_module(account, Xep.JingleRtp.Module.IDENTITY).session_info_type.send_ringing(session);
+            }
+        }
+
+        private Call create_received_call(Account account, Jid from, Jid to, bool video_requested) {
+            Call call = new Call();
+            if (from.equals_bare(account.bare_jid)) {
+                // Call requested by another of our devices
+                call.direction = Call.DIRECTION_OUTGOING;
+                call.ourpart = from;
+                call.counterpart = to;
+            } else {
+                call.direction = Call.DIRECTION_INCOMING;
+                call.ourpart = account.full_jid;
+                call.counterpart = from;
+            }
+            call.account = account;
+            call.time = call.local_time = new DateTime.now_utc();
+            call.state = Call.State.RINGING;
+
+            Conversation conversation = stream_interactor.get_module(ConversationManager.IDENTITY).create_conversation(call.counterpart.bare_jid, account, Conversation.Type.CHAT);
+
+            stream_interactor.get_module(CallStore.IDENTITY).add_call(call, conversation);
+
+            conversation.last_active = call.time;
+
+            we_should_send_video[call] = video_requested;
+            we_should_send_audio[call] = true;
+
+            if (call.direction == Call.DIRECTION_INCOMING) {
+                call_incoming(call, conversation, video_requested);
+            } else {
+                call_outgoing(call, conversation);
+            }
+
+            return call;
+        }
+
+        private void on_incoming_content_add(XmppStream stream, Call call, Xep.Jingle.Session session, Xep.Jingle.Content content) {
+            Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters;
+
+            if (rtp_content_parameter == null || session.senders_include_us(content.senders)) {
+                content.reject();
+                return;
+            }
+
+            connect_content_signals(call, content, rtp_content_parameter);
+            content.accept();
+        }
+
+        private void on_connection_ready(Call call) {
+            if (call.state == Call.State.RINGING || call.state == Call.State.ESTABLISHING) {
+                call.state = Call.State.IN_PROGRESS;
+            }
+        }
+
+        private void on_call_terminated(Call call, bool we_terminated, string? reason_name, string? reason_text) {
+            if (call.state == Call.State.RINGING || call.state == Call.State.IN_PROGRESS || call.state == Call.State.ESTABLISHING) {
+                call.end_time = new DateTime.now_utc();
+            }
+            if (call.state == Call.State.IN_PROGRESS) {
+                call.state = Call.State.ENDED;
+                call_terminated(call, reason_name, reason_text);
+            } else if (call.state == Call.State.RINGING || call.state == Call.State.ESTABLISHING) {
+                if (reason_name == Xep.Jingle.ReasonElement.DECLINE) {
+                    call.state = Call.State.DECLINED;
+                } else {
+                    call.state = Call.State.FAILED;
+                }
+                call_terminated(call, reason_name, reason_text);
+            }
+
+            remove_call_from_datastructures(call);
+        }
+
+        private void on_stream_created(Call call, string media, Xep.JingleRtp.Stream stream) {
+            if (media == "video" && stream.receiving) {
+                counterpart_sends_video[call] = true;
+                video_content_parameter[call].connection_ready.connect((status) => {
+                    counterpart_sends_video_updated(call, false);
+                });
+            }
+            stream_created(call, media);
+
+            // Outgoing audio/video might have been muted in the meanwhile.
+            if (media == "video" && !we_should_send_video[call]) {
+                mute_own_video(call, true);
+            } else if (media == "audio" && !we_should_send_audio[call]) {
+                mute_own_audio(call, true);
+            }
+        }
+
+        private void on_counterpart_mute_update(Call call, bool mute, string? media) {
+            if (!call.equals(call)) return;
+
+            if (media == "video") {
+                counterpart_sends_video[call] = !mute;
+                counterpart_sends_video_updated(call, mute);
+            }
+        }
+
+        private void connect_session_signals(Call call, Xep.Jingle.Session session) {
+            session.terminated.connect((stream, we_terminated, reason_name, reason_text) =>
+                on_call_terminated(call, we_terminated, reason_name, reason_text)
+            );
+            session.additional_content_add_incoming.connect((session,stream, content) =>
+                on_incoming_content_add(stream, call, session, content)
+            );
+
+            foreach (Xep.Jingle.Content content in session.contents.values) {
+                Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters;
+                if (rtp_content_parameter == null) continue;
+
+                connect_content_signals(call, content, rtp_content_parameter);
+            }
+        }
+
+        private void connect_content_signals(Call call, Xep.Jingle.Content content, Xep.JingleRtp.Parameters rtp_content_parameter) {
+            if (rtp_content_parameter.media == "audio") {
+                audio_content_parameter[call] = rtp_content_parameter;
+            } else if (rtp_content_parameter.media == "video") {
+                video_content[call] = content;
+                video_content_parameter[call] = rtp_content_parameter;
+            }
+
+            rtp_content_parameter.stream_created.connect((stream) => on_stream_created(call, rtp_content_parameter.media, stream));
+            rtp_content_parameter.connection_ready.connect((status) => on_connection_ready(call));
+
+            content.senders_modify_incoming.connect((content, proposed_senders) => {
+                if (content.session.senders_include_us(content.senders) != content.session.senders_include_us(proposed_senders)) {
+                    warning("counterpart set us to (not)sending %s. ignoring", content.content_name);
+                    return;
+                }
+
+                if (!content.session.senders_include_counterpart(content.senders) && content.session.senders_include_counterpart(proposed_senders)) {
+                    // Counterpart wants to start sending. Ok.
+                    content.accept_content_modify(proposed_senders);
+                    on_counterpart_mute_update(call, false, "video");
+                }
+            });
+        }
+
+        private void remove_call_from_datastructures(Call call) {
+            string? sid = sid_by_call[call.account][call];
+            sid_by_call[call.account].unset(call);
+            if (sid != null) call_by_sid[call.account].unset(sid);
+
+            sessions.unset(call);
+
+            counterpart_sends_video.unset(call);
+            we_should_send_video.unset(call);
+            we_should_send_audio.unset(call);
+
+            audio_content_parameter.unset(call);
+            video_content_parameter.unset(call);
+            video_content.unset(call);
+        }
+
+        private void on_account_added(Account account) {
+            call_by_sid[account] = new HashMap<string, Call>();
+            sid_by_call[account] = new HashMap<Call, string>();
+
+            Xep.Jingle.Module jingle_module = stream_interactor.module_manager.get_module(account, Xep.Jingle.Module.IDENTITY);
+            jingle_module.session_initiate_received.connect((stream, session) => {
+                foreach (Xep.Jingle.Content content in session.contents.values) {
+                    Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters;
+                    if (rtp_content_parameter != null) {
+                        on_incoming_call(account, session);
+                        break;
+                    }
+                }
+            });
+
+            var session_info_type = stream_interactor.module_manager.get_module(account, Xep.JingleRtp.Module.IDENTITY).session_info_type;
+            session_info_type.mute_update_received.connect((session,mute, name) => {
+                if (!call_by_sid[account].has_key(session.sid)) return;
+                Call call = call_by_sid[account][session.sid];
+
+                foreach (Xep.Jingle.Content content in session.contents.values) {
+                    if (name == null || content.content_name == name) {
+                        Xep.JingleRtp.Parameters? rtp_content_parameter = content.content_params as Xep.JingleRtp.Parameters;
+                        if (rtp_content_parameter != null) {
+                            on_counterpart_mute_update(call, mute, rtp_content_parameter.media);
+                        }
+                    }
+                }
+            });
+            session_info_type.info_received.connect((session, session_info) => {
+                if (!call_by_sid[account].has_key(session.sid)) return;
+                Call call = call_by_sid[account][session.sid];
+
+                info_received(call, session_info);
+            });
+
+            Xep.JingleMessageInitiation.Module mi_module = stream_interactor.module_manager.get_module(account, Xep.JingleMessageInitiation.Module.IDENTITY);
+            mi_module.session_proposed.connect((from, to, sid, descriptions) => {
+                bool audio_requested = descriptions.any_match((description) => description.ns_uri == Xep.JingleRtp.NS_URI && description.get_attribute("media") == "audio");
+                bool video_requested = descriptions.any_match((description) => description.ns_uri == Xep.JingleRtp.NS_URI && description.get_attribute("media") == "video");
+                if (!audio_requested && !video_requested) return;
+                Call call = create_received_call(account, from, to, video_requested);
+                call_by_sid[account][sid] = call;
+                sid_by_call[account][call] = sid;
+            });
+            mi_module.session_accepted.connect((from, sid) => {
+                if (!call_by_sid[account].has_key(sid)) return;
+
+                // Ignore session-accepted from ourselves
+                if (!from.equals(account.full_jid)) {
+                    Call call = call_by_sid[account][sid];
+                    call.state = Call.State.OTHER_DEVICE_ACCEPTED;
+                    remove_call_from_datastructures(call);
+                }
+            });
+            mi_module.session_rejected.connect((from, to, sid) => {
+                if (!call_by_sid[account].has_key(sid)) return;
+                Call call = call_by_sid[account][sid];
+                call.state = Call.State.DECLINED;
+                remove_call_from_datastructures(call);
+                call_terminated(call, null, null);
+            });
+            mi_module.session_retracted.connect((from, to, sid) => {
+                if (!call_by_sid[account].has_key(sid)) return;
+                Call call = call_by_sid[account][sid];
+                call.state = Call.State.MISSED;
+                remove_call_from_datastructures(call);
+                call_terminated(call, null, null);
+            });
+        }
+    }
+}
\ No newline at end of file
diff --git a/libdino/src/service/content_item_store.vala b/libdino/src/service/content_item_store.vala
index 2de804a1..cde8dd10 100644
--- a/libdino/src/service/content_item_store.vala
+++ b/libdino/src/service/content_item_store.vala
@@ -29,6 +29,8 @@ public class ContentItemStore : StreamInteractionModule, Object {
         stream_interactor.get_module(FileManager.IDENTITY).received_file.connect(insert_file_transfer);
         stream_interactor.get_module(MessageProcessor.IDENTITY).message_received.connect(announce_message);
         stream_interactor.get_module(MessageProcessor.IDENTITY).message_sent.connect(announce_message);
+        stream_interactor.get_module(Calls.IDENTITY).call_incoming.connect(insert_call);
+        stream_interactor.get_module(Calls.IDENTITY).call_outgoing.connect(insert_call);
     }
 
     public void init(Conversation conversation, ContentItemCollection item_collection) {
@@ -51,7 +53,6 @@ public class ContentItemStore : StreamInteractionModule, Object {
                     Message? message = stream_interactor.get_module(MessageStorage.IDENTITY).get_message_by_id(foreign_id, conversation);
                     if (message != null) {
                         var message_item = new MessageItem(message, conversation, row[db.content_item.id]);
-                        message_item.time = time;
                         items.add(message_item);
                     }
                     break;
@@ -62,6 +63,13 @@ public class ContentItemStore : StreamInteractionModule, Object {
                         items.add(file_item);
                     }
                     break;
+                case 3:
+                    Call? call = stream_interactor.get_module(CallStore.IDENTITY).get_call_by_id(foreign_id);
+                    if (call != null) {
+                        var call_item = new CallItem(call, conversation, row[db.content_item.id]);
+                        items.add(call_item);
+                    }
+                    break;
             }
         }
 
@@ -173,6 +181,15 @@ public class ContentItemStore : StreamInteractionModule, Object {
         }
     }
 
+    private void insert_call(Call call, Conversation conversation) {
+        CallItem item = new CallItem(call, conversation, -1);
+        item.id = db.add_content_item(conversation, call.time, call.local_time, 3, call.id, false);
+        if (collection_conversations.has_key(conversation)) {
+            collection_conversations.get(conversation).insert_item(item);
+        }
+        new_item(item, conversation);
+    }
+
     public bool get_item_hide(ContentItem content_item) {
         return db.content_item.row_with(db.content_item.id, content_item.id)[db.content_item.hide, false];
     }
@@ -292,4 +309,18 @@ public class FileItem : ContentItem {
     }
 }
 
+public class CallItem : ContentItem {
+    public const string TYPE = "call";
+
+    public Call call;
+    public Conversation conversation;
+
+    public CallItem(Call call, Conversation conversation, int id) {
+        base(id, TYPE, call.from, call.time, Encryption.NONE, Message.Marked.NONE);
+
+        this.call = call;
+        this.conversation = conversation;
+    }
+}
+
 }
diff --git a/libdino/src/service/database.vala b/libdino/src/service/database.vala
index 17499404..98e18d16 100644
--- a/libdino/src/service/database.vala
+++ b/libdino/src/service/database.vala
@@ -7,7 +7,7 @@ using Dino.Entities;
 namespace Dino {
 
 public class Database : Qlite.Database {
-    private const int VERSION = 19;
+    private const int VERSION = 20;
 
     public class AccountTable : Table {
         public Column<int> id = new Column.Integer("id") { primary_key = true, auto_increment = true };
@@ -155,6 +155,24 @@ public class Database : Qlite.Database {
         }
     }
 
+    public class CallTable : Table {
+        public Column<int> id = new Column.Integer("id") { primary_key = true, auto_increment = true };
+        public Column<int> account_id = new Column.Integer("account_id") { not_null = true };
+        public Column<int> counterpart_id = new Column.Integer("counterpart_id") { not_null = true };
+        public Column<string> counterpart_resource = new Column.Text("counterpart_resource");
+        public Column<string> our_resource = new Column.Text("our_resource");
+        public Column<bool> direction = new Column.BoolInt("direction") { not_null = true };
+        public Column<long> time = new Column.Long("time") { not_null = true };
+        public Column<long> local_time = new Column.Long("local_time") { not_null = true };
+        public Column<long> end_time = new Column.Long("end_time");
+        public Column<int> state = new Column.Integer("state");
+
+        internal CallTable(Database db) {
+            base(db, "call");
+            init({id, account_id, counterpart_id, counterpart_resource, our_resource, direction, time, local_time, end_time, state});
+        }
+    }
+
     public class ConversationTable : Table {
         public Column<int> id = new Column.Integer("id") { primary_key = true, auto_increment = true };
         public Column<int> account_id = new Column.Integer("account_id") { not_null = true };
@@ -275,6 +293,7 @@ public class Database : Qlite.Database {
     public MessageCorrectionTable message_correction { get; private set; }
     public RealJidTable real_jid { get; private set; }
     public FileTransferTable file_transfer { get; private set; }
+    public CallTable call { get; private set; }
     public ConversationTable conversation { get; private set; }
     public AvatarTable avatar { get; private set; }
     public EntityIdentityTable entity_identity { get; private set; }
@@ -298,6 +317,7 @@ public class Database : Qlite.Database {
         message_correction = new MessageCorrectionTable(this);
         real_jid = new RealJidTable(this);
         file_transfer = new FileTransferTable(this);
+        call = new CallTable(this);
         conversation = new ConversationTable(this);
         avatar = new AvatarTable(this);
         entity_identity = new EntityIdentityTable(this);
@@ -306,7 +326,7 @@ public class Database : Qlite.Database {
         mam_catchup = new MamCatchupTable(this);
         settings = new SettingsTable(this);
         conversation_settings = new ConversationSettingsTable(this);
-        init({ account, jid, entity, content_item, message, message_correction, real_jid, file_transfer, conversation, avatar, entity_identity, entity_feature, roster, mam_catchup, settings, conversation_settings });
+        init({ account, jid, entity, content_item, message, message_correction, real_jid, file_transfer, call, conversation, avatar, entity_identity, entity_feature, roster, mam_catchup, settings, conversation_settings });
 
         try {
             exec("PRAGMA journal_mode = WAL");
diff --git a/libdino/src/service/jingle_file_transfers.vala b/libdino/src/service/jingle_file_transfers.vala
index a96c716a..e86f923c 100644
--- a/libdino/src/service/jingle_file_transfers.vala
+++ b/libdino/src/service/jingle_file_transfers.vala
@@ -103,7 +103,7 @@ public class JingleFileProvider : FileProvider, Object {
             throw new FileReceiveError.DOWNLOAD_FAILED("Transfer data not available anymore");
         }
         try {
-            jingle_file_transfer.accept(stream);
+            yield jingle_file_transfer.accept(stream);
         } catch (IOError e) {
             throw new FileReceiveError.DOWNLOAD_FAILED("Establishing connection did not work");
         }
@@ -202,8 +202,11 @@ public class JingleFileSender : FileSender, Object {
         if (stream == null) throw new FileSendError.UPLOAD_FAILED("No stream available");
         JingleFileEncryptionHelper? helper = JingleFileHelperRegistry.instance.get_encryption_helper(file_transfer.encryption);
         bool must_encrypt = helper != null && yield helper.can_encrypt(conversation, file_transfer);
+        // TODO(hrxi): Prioritization of transports (and resources?).
         foreach (Jid full_jid in stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart)) {
-            // TODO(hrxi): Prioritization of transports (and resources?).
+            if (full_jid.equals(stream.get_flag(Bind.Flag.IDENTITY).my_jid)) {
+                continue;
+            }
             if (!yield stream.get_module(Xep.JingleFileTransfer.Module.IDENTITY).is_available(stream, full_jid)) {
                 continue;
             }
diff --git a/libdino/src/service/message_processor.vala b/libdino/src/service/message_processor.vala
index 98f14945..669aa193 100644
--- a/libdino/src/service/message_processor.vala
+++ b/libdino/src/service/message_processor.vala
@@ -331,7 +331,7 @@ public class MessageProcessor : StreamInteractionModule, Object {
         if (conversation == null) return;
 
         // MAM state database update
-        Xep.MessageArchiveManagement.MessageFlag mam_flag = Xep.MessageArchiveManagement.MessageFlag.get_flag(message_stanza);
+        Xep.MessageArchiveManagement.MessageFlag? mam_flag = Xep.MessageArchiveManagement.MessageFlag.get_flag(message_stanza);
         if (mam_flag == null) {
             if (current_catchup_id.has_key(account)) {
                 string? stanza_id = UniqueStableStanzaIDs.get_stanza_id(message_stanza, account.bare_jid);
diff --git a/libdino/src/service/module_manager.vala b/libdino/src/service/module_manager.vala
index c3f524df..a6165392 100644
--- a/libdino/src/service/module_manager.vala
+++ b/libdino/src/service/module_manager.vala
@@ -79,6 +79,7 @@ public class ModuleManager {
             module_map[account].add(new Xep.Jet.Module());
             module_map[account].add(new Xep.LastMessageCorrection.Module());
             module_map[account].add(new Xep.DirectMucInvitations.Module());
+            module_map[account].add(new Xep.JingleMessageInitiation.Module());
             initialize_account_modules(account, module_map[account]);
         }
     }
diff --git a/libdino/src/service/notification_events.vala b/libdino/src/service/notification_events.vala
index 7e99dcf9..0243dbe5 100644
--- a/libdino/src/service/notification_events.vala
+++ b/libdino/src/service/notification_events.vala
@@ -24,12 +24,15 @@ public class NotificationEvents : StreamInteractionModule, Object {
 
         stream_interactor.get_module(ContentItemStore.IDENTITY).new_item.connect(on_content_item_received);
         stream_interactor.get_module(PresenceManager.IDENTITY).received_subscription_request.connect(on_received_subscription_request);
+
         stream_interactor.get_module(MucManager.IDENTITY).invite_received.connect(on_invite_received);
         stream_interactor.get_module(MucManager.IDENTITY).voice_request_received.connect((account, room_jid, from_jid, nick) => {
             Conversation? conversation = stream_interactor.get_module(ConversationManager.IDENTITY).get_conversation(room_jid, account, Conversation.Type.GROUPCHAT);
             if (conversation == null) return;
             notifier.notify_voice_request.begin(conversation, from_jid);
         });
+
+        stream_interactor.get_module(Calls.IDENTITY).call_incoming.connect(on_call_incoming);
         stream_interactor.connection_manager.connection_error.connect((account, error) => notifier.notify_connection_error.begin(account, error));
         stream_interactor.get_module(ChatInteraction.IDENTITY).focused_in.connect((conversation) => {
             notifier.retract_content_item_notifications.begin();
@@ -91,6 +94,9 @@ public class NotificationEvents : StreamInteractionModule, Object {
                     notifier.notify_file.begin(file_transfer, conversation, is_image, conversation_display_name, participant_display_name);
                 }
                 break;
+            case CallItem.TYPE:
+                // handled in `on_call_incoming`
+                break;
         }
     }
 
@@ -101,6 +107,18 @@ public class NotificationEvents : StreamInteractionModule, Object {
         notifier.notify_subscription_request.begin(conversation);
     }
 
+    private void on_call_incoming(Call call, Conversation conversation, bool video) {
+        string conversation_display_name = get_conversation_display_name(stream_interactor, conversation, null);
+
+        notifier.notify_call.begin(call, conversation, video, conversation_display_name);
+        call.notify["state"].connect(() => {
+
+            if (call.state != Call.State.RINGING) {
+                notifier.retract_call_notification(call, conversation);
+            }
+        });
+    }
+
     private void on_invite_received(Account account, Jid room_jid, Jid from_jid, string? password, string? reason) {
         string inviter_display_name;
         if (room_jid.equals_bare(from_jid)) {
@@ -119,6 +137,8 @@ public interface NotificationProvider : Object {
 
     public abstract async void notify_message(Message message, Conversation conversation, string conversation_display_name, string? participant_display_name);
     public abstract async void notify_file(FileTransfer file_transfer, Conversation conversation, bool is_image, string conversation_display_name, string? participant_display_name);
+    public abstract async void notify_call(Call call, Conversation conversation, bool video, string conversation_display_name);
+    public abstract async void retract_call_notification(Call call, Conversation conversation);
     public abstract async void notify_subscription_request(Conversation conversation);
     public abstract async void notify_connection_error(Account account, ConnectionManager.ConnectionError error);
     public abstract async void notify_muc_invite(Account account, Jid room_jid, Jid from_jid, string inviter_display_name);