multiparty/rust: Add Rust version of multiparty demo

Different to the C version this also mixes all participants into a grid
with videomixer.

diff --git a/webrtc/multiparty-sendrecv/gst-rust/Cargo.lock b/webrtc/multiparty-sendrecv/gst-rust/Cargo.lock
new file mode 100644 (file)
index 0000000..90d7220
--- /dev/null
+++ b/webrtc/multiparty-sendrecv/gst-rust/Cargo.lock
@@ -0,0 +1,1366 @@
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diff --git a/webrtc/multiparty-sendrecv/gst-rust/Cargo.toml b/webrtc/multiparty-sendrecv/gst-rust/Cargo.toml
new file mode 100644 (file)
index 0000000..413a0b8
--- /dev/null
+++ b/webrtc/multiparty-sendrecv/gst-rust/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "webrtc-app"
+version = "0.1.0"
+authors = ["Sebastian Dröge <sebastian@centricular.com>"]
+edition = "2018"
+
+[dependencies]
+futures = "0.3"
+async-std = "1"
+structopt = { version = "0.3", default-features = false }
+anyhow = "1"
+url = "2"
+rand = "0.7"
+async-tungstenite = "0.2"
+gst = { package = "gstreamer", version = "0.14", features = ["v1_14"] }
+gst-webrtc = { package = "gstreamer-webrtc", version = "0.14" }
+gst-sdp = { package = "gstreamer-sdp", version = "0.14", features = ["v1_14"] }
+serde = "1"
+serde_derive = "1"
+serde_json = "1"

diff --git a/webrtc/multiparty-sendrecv/gst-rust/src/macos_workaround.rs b/webrtc/multiparty-sendrecv/gst-rust/src/macos_workaround.rs
new file mode 100644 (file)
index 0000000..f22be66
--- /dev/null
+++ b/webrtc/multiparty-sendrecv/gst-rust/src/macos_workaround.rs
@@ -0,0 +1,67 @@
+/// macOS has a specific requirement that there must be a run loop running
+/// on the main thread in order to open windows and use OpenGL.
+
+#[cfg(target_os = "macos")]
+mod runloop {
+    use std::os::raw::c_void;
+    #[repr(C)]
+    pub struct CFRunLoop(*mut c_void);
+
+    #[link(name = "foundation", kind = "framework")]
+    extern "C" {
+        fn CFRunLoopRun();
+        fn CFRunLoopGetMain() -> *mut c_void;
+        fn CFRunLoopStop(l: *mut c_void);
+    }
+
+    impl CFRunLoop {
+        pub fn run() {
+            unsafe {
+                CFRunLoopRun();
+            }
+        }
+
+        pub fn get_main() -> CFRunLoop {
+            unsafe {
+                let r = CFRunLoopGetMain();
+                assert!(!r.is_null());
+                CFRunLoop(r)
+            }
+        }
+
+        pub fn stop(&self) {
+            unsafe { CFRunLoopStop(self.0) }
+        }
+    }
+
+    unsafe impl Send for CFRunLoop {}
+}
+
+/// On macOS this launches the callback function on a thread.
+/// On other platforms it's just executed immediately.
+#[cfg(not(target_os = "macos"))]
+pub fn run<T, F: FnOnce() -> T + Send + 'static>(main: F) -> T
+where
+    T: Send + 'static,
+{
+    main()
+}
+
+#[cfg(target_os = "macos")]
+pub fn run<T, F: FnOnce() -> T + Send + 'static>(main: F) -> T
+where
+    T: Send + 'static,
+{
+    use std::thread;
+
+    let l = runloop::CFRunLoop::get_main();
+    let t = thread::spawn(move || {
+        let res = main();
+        l.stop();
+        res
+    });
+
+    runloop::CFRunLoop::run();
+
+    t.join().unwrap()
+}

diff --git a/webrtc/multiparty-sendrecv/gst-rust/src/main.rs b/webrtc/multiparty-sendrecv/gst-rust/src/main.rs
new file mode 100644 (file)
index 0000000..1011344
--- /dev/null
+++ b/webrtc/multiparty-sendrecv/gst-rust/src/main.rs
@@ -0,0 +1,1069 @@
+#![recursion_limit = "256"]
+
+mod macos_workaround;
+
+use std::collections::BTreeMap;
+use std::sync::{Arc, Mutex, Weak};
+
+use rand::prelude::*;
+
+use structopt::StructOpt;
+
+use async_std::prelude::*;
+use async_std::task;
+use futures::channel::mpsc;
+use futures::sink::{Sink, SinkExt};
+use futures::stream::StreamExt;
+
+use async_tungstenite::tungstenite;
+use tungstenite::Error as WsError;
+use tungstenite::Message as WsMessage;
+
+use gst::gst_element_error;
+use gst::prelude::*;
+
+use serde_derive::{Deserialize, Serialize};
+
+use anyhow::{anyhow, bail, Context};
+
+const STUN_SERVER: &str = "stun://stun.l.google.com:19302";
+const TURN_SERVER: &str = "turn://foo:bar@webrtc.nirbheek.in:3478";
+const VIDEO_WIDTH: u32 = 1024;
+const VIDEO_HEIGHT: u32 = 768;
+
+// upgrade weak reference or return
+#[macro_export]
+macro_rules! upgrade_weak {
+    ($x:ident, $r:expr) => {{
+        match $x.upgrade() {
+            Some(o) => o,
+            None => return $r,
+        }
+    }};
+    ($x:ident) => {
+        upgrade_weak!($x, ())
+    };
+}
+
+#[derive(Debug, StructOpt)]
+struct Args {
+    #[structopt(short, long, default_value = "wss://webrtc.nirbheek.in:8443")]
+    server: String,
+    #[structopt(short, long)]
+    room_id: u32,
+}
+
+// JSON messages we communicate with
+#[derive(Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+enum JsonMsg {
+    Ice {
+        candidate: String,
+        #[serde(rename = "sdpMLineIndex")]
+        sdp_mline_index: u32,
+    },
+    Sdp {
+        #[serde(rename = "type")]
+        type_: String,
+        sdp: String,
+    },
+}
+
+// Strong reference to our application state
+#[derive(Debug, Clone)]
+struct App(Arc<AppInner>);
+
+// Weak reference to our application state
+#[derive(Debug, Clone)]
+struct AppWeak(Weak<AppInner>);
+
+// Actual application state
+#[derive(Debug)]
+struct AppInner {
+    args: Args,
+    pipeline: gst::Pipeline,
+    video_tee: gst::Element,
+    audio_tee: gst::Element,
+    video_mixer: gst::Element,
+    audio_mixer: gst::Element,
+    send_msg_tx: Arc<Mutex<mpsc::UnboundedSender<WsMessage>>>,
+    peers: Mutex<BTreeMap<u32, Peer>>,
+}
+
+// Strong reference to the state of one peer
+#[derive(Debug, Clone)]
+struct Peer(Arc<PeerInner>);
+
+// Weak reference to the state of one peer
+#[derive(Debug, Clone)]
+struct PeerWeak(Weak<PeerInner>);
+
+// Actual peer state
+#[derive(Debug)]
+struct PeerInner {
+    peer_id: u32,
+    bin: gst::Bin,
+    webrtcbin: gst::Element,
+    send_msg_tx: Arc<Mutex<mpsc::UnboundedSender<WsMessage>>>,
+}
+
+// To be able to access the App's fields directly
+impl std::ops::Deref for App {
+    type Target = AppInner;
+
+    fn deref(&self) -> &AppInner {
+        &self.0
+    }
+}
+
+// To be able to access the Peers's fields directly
+impl std::ops::Deref for Peer {
+    type Target = PeerInner;
+
+    fn deref(&self) -> &PeerInner {
+        &self.0
+    }
+}
+
+impl AppWeak {
+    // Try upgrading a weak reference to a strong one
+    fn upgrade(&self) -> Option<App> {
+        self.0.upgrade().map(App)
+    }
+}
+
+impl PeerWeak {
+    // Try upgrading a weak reference to a strong one
+    fn upgrade(&self) -> Option<Peer> {
+        self.0.upgrade().map(Peer)
+    }
+}
+
+impl App {
+    // Downgrade the strong reference to a weak reference
+    fn downgrade(&self) -> AppWeak {
+        AppWeak(Arc::downgrade(&self.0))
+    }
+
+    fn new(
+        args: Args,
+        initial_peers: &[&str],
+    ) -> Result<
+        (
+            Self,
+            impl Stream<Item = gst::Message>,
+            impl Stream<Item = WsMessage>,
+        ),
+        anyhow::Error,
+    > {
+        // Create the GStreamer pipeline
+        let pipeline = gst::parse_launch(
+            &format!(
+                "videotestsrc is-live=true ! vp8enc deadline=1 ! rtpvp8pay pt=96 ! tee name=video-tee ! \
+                 queue ! fakesink sync=true \
+                 audiotestsrc wave=ticks is-live=true ! opusenc ! rtpopuspay pt=97 ! tee name=audio-tee ! \
+                 queue ! fakesink sync=true \
+                 audiotestsrc wave=silence is-live=true ! audio-mixer. \
+                 audiomixer name=audio-mixer sink_0::mute=true ! audioconvert ! audioresample ! autoaudiosink \
+                 videotestsrc pattern=black ! capsfilter caps=video/x-raw,width=1,height=1 ! video-mixer. \
+                 compositor name=video-mixer background=black sink_0::alpha=0.0 ! capsfilter caps=video/x-raw,width={width},height={height} ! videoconvert ! autovideosink",
+                width=VIDEO_WIDTH,
+                height=VIDEO_HEIGHT,
+        ))?;
+
+        // Downcast from gst::Element to gst::Pipeline
+        let pipeline = pipeline
+            .downcast::<gst::Pipeline>()
+            .expect("not a pipeline");
+
+        // Get access to the tees and mixers by name
+        let video_tee = pipeline
+            .get_by_name("video-tee")
+            .expect("can't find video-tee");
+        let audio_tee = pipeline
+            .get_by_name("audio-tee")
+            .expect("can't find audio-tee");
+
+        let video_mixer = pipeline
+            .get_by_name("video-mixer")
+            .expect("can't find video-mixer");
+        let audio_mixer = pipeline
+            .get_by_name("audio-mixer")
+            .expect("can't find audio-mixer");
+
+        let bus = pipeline.get_bus().unwrap();
+
+        // Send our bus messages via a futures channel to be handled asynchronously
+        let (send_gst_msg_tx, send_gst_msg_rx) = mpsc::unbounded::<gst::Message>();
+        let send_gst_msg_tx = Mutex::new(send_gst_msg_tx);
+        bus.set_sync_handler(move |_, msg| {
+            let _ = send_gst_msg_tx.lock().unwrap().unbounded_send(msg.clone());
+            gst::BusSyncReply::Drop
+        });
+
+        // Channel for outgoing WebSocket messages from other threads
+        let (send_ws_msg_tx, send_ws_msg_rx) = mpsc::unbounded::<WsMessage>();
+
+        // Asynchronously set the pipeline to Playing
+        pipeline.call_async(|pipeline| {
+            pipeline
+                .set_state(gst::State::Playing)
+                .expect("Couldn't set pipeline to Playing");
+        });
+
+        let app = App(Arc::new(AppInner {
+            args,
+            pipeline,
+            video_tee,
+            audio_tee,
+            video_mixer,
+            audio_mixer,
+            peers: Mutex::new(BTreeMap::new()),
+            send_msg_tx: Arc::new(Mutex::new(send_ws_msg_tx)),
+        }));
+
+        for peer in initial_peers {
+            app.add_peer(peer, true)?;
+        }
+
+        // Asynchronously set the pipeline to Playing
+        app.pipeline.call_async(|pipeline| {
+            // If this fails, post an error on the bus so we exit
+            if pipeline.set_state(gst::State::Playing).is_err() {
+                gst_element_error!(
+                    pipeline,
+                    gst::LibraryError::Failed,
+                    ("Failed to set pipeline to Playing")
+                );
+            }
+        });
+
+        Ok((app, send_gst_msg_rx, send_ws_msg_rx))
+    }
+
+    // Handle WebSocket messages, both our own as well as WebSocket protocol messages
+    fn handle_websocket_message(&self, msg: &str) -> Result<(), anyhow::Error> {
+        if msg.starts_with("ERROR") {
+            bail!("Got error message: {}", msg);
+        }
+
+        if msg.starts_with("ROOM_PEER_MSG ") {
+            // Parse message and pass to the peer if we know about it
+            let mut split = msg["ROOM_PEER_MSG ".len()..].splitn(2, ' ');
+            let peer_id = split
+                .next()
+                .and_then(|s| str::parse::<u32>(s).ok())
+                .ok_or_else(|| anyhow!("Can't parse peer id"))?;
+
+            let peers = self.peers.lock().unwrap();
+            let peer = peers
+                .get(&peer_id)
+                .ok_or_else(|| anyhow!("Can't find peer {}", peer_id))?
+                .clone();
+            drop(peers);
+
+            let msg = split
+                .next()
+                .ok_or_else(|| anyhow!("Can't parse peer message"))?;
+
+            let json_msg: JsonMsg = serde_json::from_str(msg)?;
+
+            match json_msg {
+                JsonMsg::Sdp { type_, sdp } => peer.handle_sdp(&type_, &sdp),
+                JsonMsg::Ice {
+                    sdp_mline_index,
+                    candidate,
+                } => peer.handle_ice(sdp_mline_index, &candidate),
+            }
+        } else if msg.starts_with("ROOM_PEER_JOINED ") {
+            // Parse message and add the new peer
+            let mut split = msg["ROOM_PEER_JOINED ".len()..].splitn(2, ' ');
+            let peer_id = split.next().ok_or_else(|| anyhow!("Can't parse peer id"))?;
+
+            self.add_peer(peer_id, false)
+        } else if msg.starts_with("ROOM_PEER_LEFT ") {
+            // Parse message and add the new peer
+            let mut split = msg["ROOM_PEER_LEFT ".len()..].splitn(2, ' ');
+            let peer_id = split.next().ok_or_else(|| anyhow!("Can't parse peer id"))?;
+
+            self.remove_peer(peer_id)
+        } else {
+            Ok(())
+        }
+    }
+
+    // Handle GStreamer messages coming from the pipeline
+    fn handle_pipeline_message(&self, message: &gst::Message) -> Result<(), anyhow::Error> {
+        use gst::message::MessageView;
+
+        match message.view() {
+            MessageView::Error(err) => bail!(
+                "Error from element {}: {} ({})",
+                err.get_src()
+                    .map(|s| String::from(s.get_path_string()))
+                    .unwrap_or_else(|| String::from("None")),
+                err.get_error(),
+                err.get_debug().unwrap_or_else(|| String::from("None")),
+            ),
+            MessageView::Warning(warning) => {
+                println!("Warning: \"{}\"", warning.get_debug().unwrap());
+            }
+            _ => (),
+        }
+
+        Ok(())
+    }
+
+    // Add this new peer and if requested, send the offer to it
+    fn add_peer(&self, peer: &str, offer: bool) -> Result<(), anyhow::Error> {
+        println!("Adding peer {}", peer);
+        let peer_id = str::parse::<u32>(peer).with_context(|| format!("Can't parse peer id"))?;
+        let mut peers = self.peers.lock().unwrap();
+        if peers.contains_key(&peer_id) {
+            bail!("Peer {} already called", peer_id);
+        }
+
+        let peer_bin = gst::parse_bin_from_description(
+            "queue name=video-queue ! webrtcbin. \
+             queue name=audio-queue ! webrtcbin. \
+             webrtcbin name=webrtcbin",
+            false,
+        )?;
+
+        // Get access to the webrtcbin by name
+        let webrtcbin = peer_bin
+            .get_by_name("webrtcbin")
+            .expect("can't find webrtcbin");
+
+        // Set some properties on webrtcbin
+        webrtcbin.set_property_from_str("stun-server", STUN_SERVER);
+        webrtcbin.set_property_from_str("turn-server", TURN_SERVER);
+        webrtcbin.set_property_from_str("bundle-policy", "max-bundle");
+
+        // Add ghost pads for connecting to the input
+        let audio_queue = peer_bin
+            .get_by_name("audio-queue")
+            .expect("can't find audio-queue");
+        let audio_sink_pad = gst::GhostPad::new(
+            Some("audio_sink"),
+            &audio_queue.get_static_pad("sink").unwrap(),
+        )
+        .unwrap();
+        peer_bin.add_pad(&audio_sink_pad).unwrap();
+
+        let video_queue = peer_bin
+            .get_by_name("video-queue")
+            .expect("can't find video-queue");
+        let video_sink_pad = gst::GhostPad::new(
+            Some("video_sink"),
+            &video_queue.get_static_pad("sink").unwrap(),
+        )
+        .unwrap();
+        peer_bin.add_pad(&video_sink_pad).unwrap();
+
+        let peer = Peer(Arc::new(PeerInner {
+            peer_id,
+            bin: peer_bin,
+            webrtcbin,
+            send_msg_tx: self.send_msg_tx.clone(),
+        }));
+
+        // Insert the peer into our map
+        peers.insert(peer_id, peer.clone());
+        drop(peers);
+
+        // Add to the whole pipeline
+        self.pipeline.add(&peer.bin).unwrap();
+
+        // If we should send the offer to the peer, do so from on-negotiation-needed
+        if offer {
+            // Connect to on-negotiation-needed to handle sending an Offer
+            let peer_clone = peer.downgrade();
+            peer.webrtcbin
+                .connect("on-negotiation-needed", false, move |values| {
+                    let _webrtc = values[0].get::<gst::Element>().unwrap();
+
+                    let peer = upgrade_weak!(peer_clone, None);
+                    if let Err(err) = peer.on_negotiation_needed() {
+                        gst_element_error!(
+                            peer.bin,
+                            gst::LibraryError::Failed,
+                            ("Failed to negotiate: {:?}", err)
+                        );
+                    }
+
+                    None
+                })
+                .unwrap();
+        }
+
+        // Whenever there is a new ICE candidate, send it to the peer
+        let peer_clone = peer.downgrade();
+        peer.webrtcbin
+            .connect("on-ice-candidate", false, move |values| {
+                let _webrtc = values[0].get::<gst::Element>().expect("Invalid argument");
+                let mlineindex = values[1].get::<u32>().expect("Invalid argument");
+                let candidate = values[2].get::<String>().expect("Invalid argument");
+
+                let peer = upgrade_weak!(peer_clone, None);
+
+                if let Err(err) = peer.on_ice_candidate(mlineindex, candidate) {
+                    gst_element_error!(
+                        peer.bin,
+                        gst::LibraryError::Failed,
+                        ("Failed to send ICE candidate: {:?}", err)
+                    );
+                }
+
+                None
+            })
+            .unwrap();
+
+        // Whenever there is a new stream incoming from the peer, handle it
+        let peer_clone = peer.downgrade();
+        peer.webrtcbin.connect_pad_added(move |_webrtc, pad| {
+            let peer = upgrade_weak!(peer_clone);
+
+            if let Err(err) = peer.on_incoming_stream(pad) {
+                gst_element_error!(
+                    peer.bin,
+                    gst::LibraryError::Failed,
+                    ("Failed to handle incoming stream: {:?}", err)
+                );
+            }
+        });
+
+        // Whenever a decoded stream comes available, handle it and connect it to the mixers
+        let app_clone = self.downgrade();
+        peer.bin.connect_pad_added(move |_bin, pad| {
+            let app = upgrade_weak!(app_clone);
+
+            if pad.get_name() == "audio_src" {
+                let audiomixer_sink_pad = app.audio_mixer.get_request_pad("sink_%u").unwrap();
+                pad.link(&audiomixer_sink_pad).unwrap();
+
+                // Once it is unlinked again later when the peer is being removed,
+                // also release the pad on the mixer
+                audiomixer_sink_pad.connect_unlinked(move |pad, _peer| {
+                    if let Some(audiomixer) = pad.get_parent() {
+                        let audiomixer = audiomixer.downcast_ref::<gst::Element>().unwrap();
+                        audiomixer.release_request_pad(pad);
+                    }
+                });
+            } else if pad.get_name() == "video_src" {
+                let videomixer_sink_pad = app.video_mixer.get_request_pad("sink_%u").unwrap();
+                pad.link(&videomixer_sink_pad).unwrap();
+
+                app.relayout_videomixer();
+
+                // Once it is unlinked again later when the peer is being removed,
+                // also release the pad on the mixer
+                let app_clone = app.downgrade();
+                videomixer_sink_pad.connect_unlinked(move |pad, _peer| {
+                    let app = upgrade_weak!(app_clone);
+
+                    if let Some(videomixer) = pad.get_parent() {
+                        let videomixer = videomixer.downcast_ref::<gst::Element>().unwrap();
+                        videomixer.release_request_pad(pad);
+                    }
+
+                    app.relayout_videomixer();
+                });
+            }
+        });
+
+        // Add pad probes to both tees for blocking them and
+        // then unblock them once we reached the Playing state.
+        //
+        // Then link them and unblock, in case they got blocked
+        // in the meantime.
+        //
+        // Otherwise it might happen that data is received before
+        // the elements are ready and then an error happens.
+        let audio_src_pad = self.audio_tee.get_request_pad("src_%u").unwrap();
+        let audio_block = audio_src_pad
+            .add_probe(gst::PadProbeType::BLOCK_DOWNSTREAM, |_pad, _info| {
+                gst::PadProbeReturn::Ok
+            })
+            .unwrap();
+        audio_src_pad.link(&audio_sink_pad)?;
+
+        let video_src_pad = self.video_tee.get_request_pad("src_%u").unwrap();
+        let video_block = video_src_pad
+            .add_probe(gst::PadProbeType::BLOCK_DOWNSTREAM, |_pad, _info| {
+                gst::PadProbeReturn::Ok
+            })
+            .unwrap();
+        video_src_pad.link(&video_sink_pad)?;
+
+        // Asynchronously set the peer bin to Playing
+        peer.bin.call_async(move |bin| {
+            // If this fails, post an error on the bus so we exit
+            if bin.sync_state_with_parent().is_err() {
+                gst_element_error!(
+                    bin,
+                    gst::LibraryError::Failed,
+                    ("Failed to set peer bin to Playing")
+                );
+            }
+
+            // And now unblock
+            audio_src_pad.remove_probe(audio_block);
+            video_src_pad.remove_probe(video_block);
+        });
+
+        Ok(())
+    }
+
+    // Remove this peer
+    fn remove_peer(&self, peer: &str) -> Result<(), anyhow::Error> {
+        println!("Removing peer {}", peer);
+        let peer_id = str::parse::<u32>(peer).with_context(|| format!("Can't parse peer id"))?;
+        let mut peers = self.peers.lock().unwrap();
+        if let Some(peer) = peers.remove(&peer_id) {
+            drop(peers);
+
+            // Now asynchronously remove the peer from the pipeline
+            let app_clone = self.downgrade();
+            self.pipeline.call_async(move |_pipeline| {
+                let app = upgrade_weak!(app_clone);
+
+                // Block the tees shortly for removal
+                let audio_tee_sinkpad = app.audio_tee.get_static_pad("sink").unwrap();
+                let audio_block = audio_tee_sinkpad
+                    .add_probe(gst::PadProbeType::BLOCK_DOWNSTREAM, |_pad, _info| {
+                        gst::PadProbeReturn::Ok
+                    })
+                    .unwrap();
+
+                let video_tee_sinkpad = app.video_tee.get_static_pad("sink").unwrap();
+                let video_block = video_tee_sinkpad
+                    .add_probe(gst::PadProbeType::BLOCK_DOWNSTREAM, |_pad, _info| {
+                        gst::PadProbeReturn::Ok
+                    })
+                    .unwrap();
+
+                // Release the tee pads and unblock
+                let audio_sinkpad = peer.bin.get_static_pad("audio_sink").unwrap();
+                let video_sinkpad = peer.bin.get_static_pad("video_sink").unwrap();
+
+                if let Some(audio_tee_srcpad) = audio_sinkpad.get_peer() {
+                    let _ = audio_tee_srcpad.unlink(&audio_sinkpad);
+                    app.audio_tee.release_request_pad(&audio_tee_srcpad);
+                }
+                audio_tee_sinkpad.remove_probe(audio_block);
+
+                if let Some(video_tee_srcpad) = video_sinkpad.get_peer() {
+                    let _ = video_tee_srcpad.unlink(&video_sinkpad);
+                    app.video_tee.release_request_pad(&video_tee_srcpad);
+                }
+                video_tee_sinkpad.remove_probe(video_block);
+
+                // Then remove the peer bin gracefully from the pipeline
+                let _ = app.pipeline.remove(&peer.bin);
+                let _ = peer.bin.set_state(gst::State::Null);
+
+                println!("Removed peer {}", peer.peer_id);
+            });
+        }
+
+        Ok(())
+    }
+
+    fn relayout_videomixer(&self) {
+        let mut pads = self.video_mixer.get_sink_pads();
+        if pads.is_empty() {
+            return;
+        }
+
+        // We ignore the first pad
+        pads.remove(0);
+        let npads = pads.len();
+
+        let (width, height) = if npads <= 1 {
+            (1, 1)
+        } else if npads <= 4 {
+            (2, 2)
+        } else if npads <= 16 {
+            (4, 4)
+        } else {
+            // FIXME: we don't support more than 16 streams for now
+            (4, 4)
+        };
+
+        let mut x: i32 = 0;
+        let mut y: i32 = 0;
+        let w = VIDEO_WIDTH as i32 / width;
+        let h = VIDEO_HEIGHT as i32 / height;
+
+        for pad in pads {
+            pad.set_property("xpos", &x).unwrap();
+            pad.set_property("ypos", &y).unwrap();
+            pad.set_property("width", &w).unwrap();
+            pad.set_property("height", &h).unwrap();
+
+            x += w;
+            if x >= VIDEO_WIDTH as i32 {
+                x = 0;
+                y += h;
+            }
+        }
+    }
+}
+
+// Make sure to shut down the pipeline when it goes out of scope
+// to release any system resources
+impl Drop for AppInner {
+    fn drop(&mut self) {
+        let _ = self.pipeline.set_state(gst::State::Null);
+    }
+}
+
+impl Peer {
+    // Downgrade the strong reference to a weak reference
+    fn downgrade(&self) -> PeerWeak {
+        PeerWeak(Arc::downgrade(&self.0))
+    }
+
+    // Whenever webrtcbin tells us that (re-)negotiation is needed, simply ask
+    // for a new offer SDP from webrtcbin without any customization and then
+    // asynchronously send it to the peer via the WebSocket connection
+    fn on_negotiation_needed(&self) -> Result<(), anyhow::Error> {
+        println!("starting negotiation with peer {}", self.peer_id);
+
+        let peer_clone = self.downgrade();
+        let promise = gst::Promise::new_with_change_func(move |promise| {
+            let peer = upgrade_weak!(peer_clone);
+
+            if let Err(err) = peer.on_offer_created(promise) {
+                gst_element_error!(
+                    peer.bin,
+                    gst::LibraryError::Failed,
+                    ("Failed to send SDP offer: {:?}", err)
+                );
+            }
+        });
+
+        self.webrtcbin
+            .emit("create-offer", &[&None::<gst::Structure>, &promise])
+            .unwrap();
+
+        Ok(())
+    }
+
+    // Once webrtcbin has create the offer SDP for us, handle it by sending it to the peer via the
+    // WebSocket connection
+    fn on_offer_created(&self, promise: &gst::Promise) -> Result<(), anyhow::Error> {
+        let reply = match promise.wait() {
+            gst::PromiseResult::Replied => promise.get_reply().unwrap(),
+            err => {
+                bail!("Offer creation future got no reponse: {:?}", err);
+            }
+        };
+
+        let offer = reply
+            .get_value("offer")
+            .unwrap()
+            .get::<gst_webrtc::WebRTCSessionDescription>()
+            .expect("Invalid argument");
+        self.webrtcbin
+            .emit("set-local-description", &[&offer, &None::<gst::Promise>])
+            .unwrap();
+
+        println!(
+            "sending SDP offer to peer: {}",
+            offer.get_sdp().as_text().unwrap()
+        );
+
+        let message = serde_json::to_string(&JsonMsg::Sdp {
+            type_: "offer".to_string(),
+            sdp: offer.get_sdp().as_text().unwrap(),
+        })
+        .unwrap();
+
+        self.send_msg_tx
+            .lock()
+            .unwrap()
+            .unbounded_send(WsMessage::Text(format!(
+                "ROOM_PEER_MSG {} {}",
+                self.peer_id, message
+            )))
+            .with_context(|| format!("Failed to send SDP offer"))?;
+
+        Ok(())
+    }
+
+    // Once webrtcbin has create the answer SDP for us, handle it by sending it to the peer via the
+    // WebSocket connection
+    fn on_answer_created(&self, promise: &gst::Promise) -> Result<(), anyhow::Error> {
+        let reply = match promise.wait() {
+            gst::PromiseResult::Replied => promise.get_reply().unwrap(),
+            err => {
+                bail!("Answer creation future got no reponse: {:?}", err);
+            }
+        };
+
+        let answer = reply
+            .get_value("answer")
+            .unwrap()
+            .get::<gst_webrtc::WebRTCSessionDescription>()
+            .expect("Invalid argument");
+        self.webrtcbin
+            .emit("set-local-description", &[&answer, &None::<gst::Promise>])
+            .unwrap();
+
+        println!(
+            "sending SDP answer to peer: {}",
+            answer.get_sdp().as_text().unwrap()
+        );
+
+        let message = serde_json::to_string(&JsonMsg::Sdp {
+            type_: "answer".to_string(),
+            sdp: answer.get_sdp().as_text().unwrap(),
+        })
+        .unwrap();
+
+        self.send_msg_tx
+            .lock()
+            .unwrap()
+            .unbounded_send(WsMessage::Text(format!(
+                "ROOM_PEER_MSG {} {}",
+                self.peer_id, message
+            )))
+            .with_context(|| format!("Failed to send SDP answer"))?;
+
+        Ok(())
+    }
+
+    // Handle incoming SDP answers from the peer
+    fn handle_sdp(&self, type_: &str, sdp: &str) -> Result<(), anyhow::Error> {
+        if type_ == "answer" {
+            print!("Received answer:\n{}\n", sdp);
+
+            let ret = gst_sdp::SDPMessage::parse_buffer(sdp.as_bytes())
+                .map_err(|_| anyhow!("Failed to parse SDP answer"))?;
+            let answer =
+                gst_webrtc::WebRTCSessionDescription::new(gst_webrtc::WebRTCSDPType::Answer, ret);
+
+            self.webrtcbin
+                .emit("set-remote-description", &[&answer, &None::<gst::Promise>])
+                .unwrap();
+
+            Ok(())
+        } else if type_ == "offer" {
+            print!("Received offer:\n{}\n", sdp);
+
+            let ret = gst_sdp::SDPMessage::parse_buffer(sdp.as_bytes())
+                .map_err(|_| anyhow!("Failed to parse SDP offer"))?;
+
+            // And then asynchronously start our pipeline and do the next steps. The
+            // pipeline needs to be started before we can create an answer
+            let peer_clone = self.downgrade();
+            self.bin.call_async(move |_pipeline| {
+                let peer = upgrade_weak!(peer_clone);
+
+                let offer = gst_webrtc::WebRTCSessionDescription::new(
+                    gst_webrtc::WebRTCSDPType::Offer,
+                    ret,
+                );
+
+                peer.0
+                    .webrtcbin
+                    .emit("set-remote-description", &[&offer, &None::<gst::Promise>])
+                    .unwrap();
+
+                let peer_clone = peer.downgrade();
+                let promise = gst::Promise::new_with_change_func(move |promise| {
+                    let peer = upgrade_weak!(peer_clone);
+
+                    if let Err(err) = peer.on_answer_created(promise) {
+                        gst_element_error!(
+                            peer.bin,
+                            gst::LibraryError::Failed,
+                            ("Failed to send SDP answer: {:?}", err)
+                        );
+                    }
+                });
+
+                peer.0
+                    .webrtcbin
+                    .emit("create-answer", &[&None::<gst::Structure>, &promise])
+                    .unwrap();
+            });
+
+            Ok(())
+        } else {
+            bail!("Sdp type is not \"answer\" but \"{}\"", type_)
+        }
+    }
+
+    // Handle incoming ICE candidates from the peer by passing them to webrtcbin
+    fn handle_ice(&self, sdp_mline_index: u32, candidate: &str) -> Result<(), anyhow::Error> {
+        self.webrtcbin
+            .emit("add-ice-candidate", &[&sdp_mline_index, &candidate])
+            .unwrap();
+
+        Ok(())
+    }
+
+    // Asynchronously send ICE candidates to the peer via the WebSocket connection as a JSON
+    // message
+    fn on_ice_candidate(&self, mlineindex: u32, candidate: String) -> Result<(), anyhow::Error> {
+        let message = serde_json::to_string(&JsonMsg::Ice {
+            candidate,
+            sdp_mline_index: mlineindex,
+        })
+        .unwrap();
+
+        self.send_msg_tx
+            .lock()
+            .unwrap()
+            .unbounded_send(WsMessage::Text(format!(
+                "ROOM_PEER_MSG {} {}",
+                self.peer_id, message
+            )))
+            .with_context(|| format!("Failed to send ICE candidate"))?;
+
+        Ok(())
+    }
+
+    // Whenever there's a new incoming, encoded stream from the peer create a new decodebin
+    // and audio/video sink depending on the stream type
+    fn on_incoming_stream(&self, pad: &gst::Pad) -> Result<(), anyhow::Error> {
+        // Early return for the source pads we're adding ourselves
+        if pad.get_direction() != gst::PadDirection::Src {
+            return Ok(());
+        }
+
+        let caps = pad.get_current_caps().unwrap();
+        let s = caps.get_structure(0).unwrap();
+        let media_type = s
+            .get::<&str>("media")
+            .ok_or_else(|| anyhow!("no media type in caps {:?}", caps))?;
+
+        let conv = if media_type == "video" {
+            gst::parse_bin_from_description(
+                &format!(
+                    "decodebin name=dbin ! queue ! videoconvert ! videoscale ! capsfilter name=src caps=video/x-raw,width={width},height={height},pixel-aspect-ratio=1/1",
+                    width=VIDEO_WIDTH,
+                    height=VIDEO_HEIGHT
+                ),
+                false,
+            )?
+        } else if media_type == "audio" {
+            gst::parse_bin_from_description(
+                "decodebin name=dbin ! queue ! audioconvert ! audioresample name=src",
+                false,
+            )?
+        } else {
+            println!("Unknown pad {:?}, ignoring", pad);
+            return Ok(());
+        };
+
+        // Add a ghost pad on our conv bin that proxies the sink pad of the decodebin
+        let dbin = conv.get_by_name("dbin").unwrap();
+        let sinkpad =
+            gst::GhostPad::new(Some("sink"), &dbin.get_static_pad("sink").unwrap()).unwrap();
+        conv.add_pad(&sinkpad).unwrap();
+
+        // And another one that proxies the source pad of the last element
+        let src = conv.get_by_name("src").unwrap();
+        let srcpad = gst::GhostPad::new(Some("src"), &src.get_static_pad("src").unwrap()).unwrap();
+        conv.add_pad(&srcpad).unwrap();
+
+        self.bin.add(&conv).unwrap();
+        conv.sync_state_with_parent()
+            .with_context(|| format!("can't start sink for stream {:?}", caps))?;
+
+        pad.link(&sinkpad)
+            .with_context(|| format!("can't link sink for stream {:?}", caps))?;
+
+        // And then add a new ghost pad to the peer bin that proxies the source pad we added above
+        if media_type == "video" {
+            let srcpad = gst::GhostPad::new(Some("video_src"), &srcpad).unwrap();
+            srcpad.set_active(true).unwrap();
+            self.bin.add_pad(&srcpad).unwrap();
+        } else if media_type == "audio" {
+            let srcpad = gst::GhostPad::new(Some("audio_src"), &srcpad).unwrap();
+            srcpad.set_active(true).unwrap();
+            self.bin.add_pad(&srcpad).unwrap();
+        }
+
+        Ok(())
+    }
+}
+
+// At least shut down the bin here if it didn't happen so far
+impl Drop for PeerInner {
+    fn drop(&mut self) {
+        let _ = self.bin.set_state(gst::State::Null);
+    }
+}
+
+async fn run(
+    args: Args,
+    initial_peers: &[&str],
+    ws: impl Sink<WsMessage, Error = WsError> + Stream<Item = Result<WsMessage, WsError>>,
+) -> Result<(), anyhow::Error> {
+    // Split the websocket into the Sink and Stream
+    let (mut ws_sink, ws_stream) = ws.split();
+    // Fuse the Stream, required for the select macro
+    let mut ws_stream = ws_stream.fuse();
+
+    // Create our application state
+    let (app, send_gst_msg_rx, send_ws_msg_rx) = App::new(args, initial_peers)?;
+
+    let mut send_gst_msg_rx = send_gst_msg_rx.fuse();
+    let mut send_ws_msg_rx = send_ws_msg_rx.fuse();
+
+    // And now let's start our message loop
+    loop {
+        let ws_msg = futures::select! {
+            // Handle the WebSocket messages here
+            ws_msg = ws_stream.select_next_some() => {
+                match ws_msg? {
+                    WsMessage::Close(_) => {
+                        println!("peer disconnected");
+                        break
+                    },
+                    WsMessage::Ping(data) => Some(WsMessage::Pong(data)),
+                    WsMessage::Pong(_) => None,
+                    WsMessage::Binary(_) => None,
+                    WsMessage::Text(text) => {
+                        if let Err(err) = app.handle_websocket_message(&text) {
+                            println!("Failed to parse message: {}", err);
+                        }
+                        None
+                    },
+                }
+            },
+            // Pass the GStreamer messages to the application control logic
+            gst_msg = send_gst_msg_rx.select_next_some() => {
+                app.handle_pipeline_message(&gst_msg)?;
+                None
+            },
+            // Handle WebSocket messages we created asynchronously
+            // to send them out now
+            ws_msg = send_ws_msg_rx.select_next_some() => Some(ws_msg),
+            // Once we're done, break the loop and return
+            complete => break,
+        };
+
+        // If there's a message to send out, do so now
+        if let Some(ws_msg) = ws_msg {
+            ws_sink.send(ws_msg).await?;
+        }
+    }
+
+    Ok(())
+}
+
+// Check if all GStreamer plugins we require are available
+fn check_plugins() -> Result<(), anyhow::Error> {
+    let needed = [
+        "videotestsrc",
+        "audiotestsrc",
+        "videoconvert",
+        "audioconvert",
+        "autodetect",
+        "opus",
+        "vpx",
+        "webrtc",
+        "nice",
+        "dtls",
+        "srtp",
+        "rtpmanager",
+        "rtp",
+        "playback",
+        "videoscale",
+        "audioresample",
+        "compositor",
+        "audiomixer",
+    ];
+
+    let registry = gst::Registry::get();
+    let missing = needed
+        .iter()
+        .filter(|n| registry.find_plugin(n).is_none())
+        .cloned()
+        .collect::<Vec<_>>();
+
+    if !missing.is_empty() {
+        bail!("Missing plugins: {:?}", missing);
+    } else {
+        Ok(())
+    }
+}
+
+async fn async_main() -> Result<(), anyhow::Error> {
+    // Initialize GStreamer first
+    gst::init()?;
+
+    check_plugins()?;
+
+    let args = Args::from_args();
+
+    // Connect to the given server
+    let url = url::Url::parse(&args.server)?;
+    let (mut ws, _) = async_tungstenite::connect_async(url).await?;
+
+    println!("connected");
+
+    // Say HELLO to the server and see if it replies with HELLO
+    let our_id = rand::thread_rng().gen_range(10, 10_000);
+    println!("Registering id {} with server", our_id);
+    ws.send(WsMessage::Text(format!("HELLO {}", our_id)))
+        .await?;
+
+    let msg = ws
+        .next()
+        .await
+        .ok_or_else(|| anyhow!("didn't receive anything"))??;
+
+    if msg != WsMessage::Text("HELLO".into()) {
+        bail!("server didn't say HELLO");
+    }
+
+    // Join the given room
+    ws.send(WsMessage::Text(format!("ROOM {}", args.room_id)))
+        .await?;
+
+    let msg = ws
+        .next()
+        .await
+        .ok_or_else(|| anyhow!("didn't receive anything"))??;
+
+    let peers_str;
+    if let WsMessage::Text(text) = &msg {
+        if !text.starts_with("ROOM_OK") {
+            bail!("server error: {:?}", text);
+        }
+
+        println!("Joined room {}", args.room_id);
+
+        peers_str = &text["ROOM_OK ".len()..];
+    } else {
+        bail!("server error: {:?}", msg);
+    }
+
+    // Collect the ids of already existing peers
+    let initial_peers = peers_str
+        .split(' ')
+        .filter_map(|p| {
+            // Filter out empty lines
+            let p = p.trim();
+            if p.is_empty() {
+                None
+            } else {
+                Some(p)
+            }
+        })
+        .collect::<Vec<_>>();
+
+    // All good, let's run our message loop
+    run(args, &initial_peers, ws).await
+}
+
+fn main() -> Result<(), anyhow::Error> {
+    macos_workaround::run(|| task::block_on(async_main()))
+}