Basic plugin structure

Cargo.toml

@@ -18,6 +18,9 @@ gst-base = { package = "gstreamer-base", git = "https://gitlab.freedesktop.org/g
 gst-video = { package = "gstreamer-video", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs", features = ["v1_12"] }
 gst-audio = { package = "gstreamer-audio", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs", features = ["v1_12"] }
 once_cell = "1.0"
+rml_rtmp = "0.3.2"
+slab = "0.4.2"
+bytes = "0.5"
 
 [build-dependencies]
 gst-plugin-version-helper = { git = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs" }

README.md

@@ -1,3 +1,17 @@
 # GStreamer RTMP Server Plugin
 
 GStreamer Plugin that creates a server that is capable of receiving a RTMP stream.
+
+### Usage
+
+Sending a test video stream:
+
+```bash
+gst-launch-1.0 videotestsrc is-live=true ! x264enc ! flvmux ! rtmpsink location='rtmp://localhost:5000/myapp/somekey live=1'
+```
+
+Receiving a rtmp video stream:
+
+```bash
+gst-launch-1.0 -v uridecodebin uri=rtmp://localhost:1935/myapp/somekey ! autovideosink
+```

src/connection.rs

@@ -0,0 +1,173 @@
+use std::collections::VecDeque;
+use std::io;
+use std::io::{Read, Write};
+use std::time::Duration;
+use std::net::TcpStream;
+use std::sync::mpsc::{channel, Receiver, Sender, TryRecvError};
+use std::thread;
+use rml_rtmp::handshake::{Handshake, HandshakeProcessResult, PeerType};
+
+const BUFFER_SIZE: usize = 4096;
+
+pub enum ReadResult {
+    HandshakingInProgress,
+    NoBytesReceived,
+    BytesReceived {
+        buffer: [u8; BUFFER_SIZE],
+        byte_count: usize,
+    },
+}
+
+#[derive(Debug)]
+pub enum ConnectionError {
+    IoError(io::Error),
+    SocketClosed,
+}
+
+impl From<io::Error> for ConnectionError {
+    fn from(error: io::Error) -> Self {
+        ConnectionError::IoError(error)
+    }
+}
+
+pub struct Connection {
+    pub connection_id: Option<usize>,
+    writer: Sender<Vec<u8>>,
+    reader: Receiver<ReadResult>,
+    handshake: Handshake,
+    handshake_completed: bool,
+}
+
+impl Connection {
+    pub fn new(socket: TcpStream) -> Connection {
+        let (byte_sender, byte_receiver) = channel();
+        let (result_sender, result_receiver) = channel();
+
+        start_byte_writer(byte_receiver, &socket);
+        start_result_reader(result_sender, &socket);
+
+        Connection {
+            connection_id: None,
+            writer: byte_sender,
+            reader: result_receiver,
+            handshake: Handshake::new(PeerType::Server),
+            handshake_completed: false,
+        }
+    }
+
+    pub fn write(&self, bytes: Vec<u8>) {
+        self.writer.send(bytes).unwrap();
+    }
+
+    pub fn read(&mut self) -> Result<ReadResult, ConnectionError> {
+        match self.reader.try_recv() {
+            Err(TryRecvError::Empty) => Ok(ReadResult::NoBytesReceived),
+            Err(TryRecvError::Disconnected) => Err(ConnectionError::SocketClosed),
+            Ok(result) => {
+                match self.handshake_completed {
+                    true => Ok(result),
+                    false => match result {
+                        ReadResult::HandshakingInProgress => unreachable!(),
+                        ReadResult::NoBytesReceived => Ok(result),
+                        ReadResult::BytesReceived {buffer, byte_count}
+                        => self.handle_handshake_bytes(&buffer[..byte_count]),
+                    }
+                }
+            }
+        }
+    }
+
+    fn handle_handshake_bytes(&mut self, bytes: &[u8]) -> Result<ReadResult, ConnectionError> {
+        let result = match self.handshake.process_bytes(bytes) {
+            Ok(result) => result,
+            Err(error) => {
+                println!("Handshake error: {:?}", error);
+                return Err(ConnectionError::SocketClosed);
+            }
+        };
+
+        match result {
+            HandshakeProcessResult::InProgress {response_bytes} => {
+                if response_bytes.len() > 0 {
+                    self.write(response_bytes);
+                }
+
+                Ok(ReadResult::HandshakingInProgress)
+            },
+
+            HandshakeProcessResult::Completed {response_bytes, remaining_bytes} => {
+                println!("Handshake successful!");
+                if response_bytes.len() > 0 {
+                    self.write(response_bytes);
+                }
+
+                let mut buffer = [0; BUFFER_SIZE];
+                let buffer_size = remaining_bytes.len();
+                for (index, value) in remaining_bytes.into_iter().enumerate() {
+                    buffer[index] = value;
+                }
+
+                self.handshake_completed = true;
+                Ok(ReadResult::BytesReceived {buffer, byte_count: buffer_size})
+            }
+        }
+    }
+}
+
+fn start_byte_writer(byte_receiver: Receiver<Vec<u8>>, socket: &TcpStream) {
+    let mut socket = socket.try_clone().expect("failed to clone socket");
+    thread::spawn(move|| {
+        let mut send_queue = VecDeque::new();
+
+        loop {
+            loop {
+                match byte_receiver.try_recv() {
+                    Err(TryRecvError::Empty) => break,
+                    Err(TryRecvError::Disconnected) => return,
+                    Ok(bytes) => send_queue.push_back(bytes),
+                }
+            }
+
+            match send_queue.pop_front() {
+                None => thread::sleep(Duration::from_millis(1)),
+                Some(bytes) => match socket.write(&bytes) {
+                    Ok(_) => (),
+                    Err(error) => {
+                        println!("Error writing to socket: {:?}", error);
+                        return;
+                    }
+                }
+            }
+        }
+    });
+}
+
+fn start_result_reader(sender: Sender<ReadResult>, socket: &TcpStream) {
+    let mut socket = socket.try_clone().unwrap();
+    thread::spawn(move|| {
+        let mut buffer = [0; BUFFER_SIZE];
+        loop {
+            match socket.read(&mut buffer) {
+                Ok(0) => return, // socket closed
+                Ok(read_count) => {
+                    let mut send_buffer = [0; BUFFER_SIZE];
+                    for x in 0..read_count {
+                        send_buffer[x] = buffer[x];
+                    }
+
+                    let result = ReadResult::BytesReceived {
+                        buffer: send_buffer,
+                        byte_count: read_count,
+                    };
+
+                    sender.send(result).unwrap();
+                },
+
+                Err(error) => {
+                    println!("Error occurred reading from socket: {:?}", error);
+                    return;
+                }
+            }
+        }
+    });
+}

src/imp.rs

@@ -7,6 +7,10 @@ use gst_base::prelude::*;
 use gst_base::subclass::prelude::*;
 
 use once_cell::sync::Lazy;
+use std::u32;
+use crate::server::Server;
+use std::sync::Mutex;
+use bytes::Bytes;
 
 static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
     gst::DebugCategory::new(
@@ -16,8 +20,64 @@ static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
     )
 });
 
-pub struct RtmpSvrSrc {
+const DEFAULT_ADDRESS: &str = "0.0.0.0";
+const DEFAULT_PORT: u32 = 5000;
 
+#[derive(Debug, Clone)]
+struct Settings {
+    address: String,
+    port: u32
+}
+
+impl Default for Settings {
+    fn default() -> Self {
+        Settings {
+            address: DEFAULT_ADDRESS.into(),
+            port: DEFAULT_PORT
+        }
+    }
+}
+
+static PROPERTIES: [subclass::Property; 2] = [
+    subclass::Property("address", |name| {
+        glib::ParamSpec::string(
+            name,
+            "Address",
+            "The address the server should listen for incoming connections",
+            DEFAULT_ADDRESS.into(),
+            glib::ParamFlags::READWRITE
+        )
+    }),
+    subclass::Property("port", |name| {
+        glib::ParamSpec::uint(
+            name,
+            "Port",
+            "The port that the server should bind to",
+            1000,
+            u32::MAX,
+            DEFAULT_PORT,
+            glib::ParamFlags::READWRITE
+        )
+    }),
+];
+
+#[derive(Debug)]
+enum State {
+    Stopped,
+    Started {
+        stream_key: String,
+    },
+}
+
+impl Default for State {
+    fn default() -> Self {
+        State::Stopped
+    }
+}
+
+pub struct RtmpSvrSrc {
+    settings: Mutex<Settings>,
+    state: Mutex<State>,
 }
 
 impl ObjectSubclass for RtmpSvrSrc {
@@ -33,15 +93,11 @@ impl ObjectSubclass for RtmpSvrSrc {
         klass.set_metadata(
             "RTMP Server Source",
             "Source/Video",
-            "Creates a server that is capable of receiving a RTMP stream",
+            "Creates a server capable of receiving a RTMP stream",
             "Rafael Caricio <rafael@caricio.com>",
         );
 
-        let caps = gst::Caps::new_simple(
+        let caps = gst::Caps::new_any();
-            "video/x-raw",
-            &[],
-        );
-
         let src_pad_template = gst::PadTemplate::new(
             "src",
             gst::PadDirection::Src,
@@ -49,14 +105,117 @@ impl ObjectSubclass for RtmpSvrSrc {
             &caps,
         ).unwrap();
         klass.add_pad_template(src_pad_template);
+
+        klass.install_properties(&PROPERTIES);
     }
 
     fn new() -> Self {
-        Self {}
+        Self {
+            settings: Mutex::new(Default::default()),
+            state: Mutex::new(Default::default()),
+        }
+    }
+}
+
+impl ObjectImpl for RtmpSvrSrc {
+
+    fn set_property(&self, obj: &Self::Type, id: usize, value: &glib::Value) {
+        let prop = &PROPERTIES[id];
+        match *prop {
+            subclass::Property("address", ..) => {
+                let mut settings = self.settings.lock().unwrap();
+                let address = value.get().expect("type checked upstream").unwrap_or_else(|| DEFAULT_ADDRESS).into();
+                settings.address = address;
+                gst_debug!(CAT, obj: obj, "Set address to: {}", settings.address);
+            }
+            subclass::Property("port", ..) => {
+                let mut settings = self.settings.lock().unwrap();
+                let port = value.get_some().expect("type checked upstream");
+                settings.port = port;
+                gst_debug!(CAT, obj: obj, "Set port to: {}", port);
+            }
+            _ => unimplemented!(),
+        };
+    }
+    fn get_property(&self, obj: &Self::Type, id: usize) -> glib::Value {
+        let prop = &PROPERTIES[id];
+        match *prop {
+            subclass::Property("address", ..) => {
+                let settings = self.settings.lock().unwrap();
+                settings.address.to_value()
+            }
+            subclass::Property("port", ..) => {
+                let settings = self.settings.lock().unwrap();
+                settings.port.to_value()
+            }
+            _ => unimplemented!(),
+        }
+    }
+
+    fn constructed(&self, obj: &Self::Type) {
+        self.parent_constructed(obj);
+        obj.set_automatic_eos(false);
+        obj.set_format(gst::Format::Bytes);
     }
 }
 
-impl ObjectImpl for RtmpSvrSrc {}
 impl ElementImpl for RtmpSvrSrc {}
-impl BaseSrcImpl for RtmpSvrSrc {}
+
-impl PushSrcImpl for RtmpSvrSrc {}
+impl BaseSrcImpl for RtmpSvrSrc {
+    fn start(&self, src: &Self::Type) -> Result<(), gst::ErrorMessage> {
+        // TODO: Here we start the server..
+        Ok(())
+    }
+
+    fn stop(&self, src: &Self::Type) -> Result<(), gst::ErrorMessage> {
+        gst_debug!(CAT, obj: src, "Stopping");
+        // TODO: Here we stop the server
+        Ok(())
+    }
+
+    fn is_seekable(&self, _src: &Self::Type) -> bool {
+        false
+    }
+
+    fn query(&self, element: &Self::Type, query: &mut gst::QueryRef) -> bool {
+        use gst::QueryView;
+
+        match query.view_mut() {
+            QueryView::Scheduling(ref mut q) => {
+                q.set(
+                    gst::SchedulingFlags::SEQUENTIAL | gst::SchedulingFlags::BANDWIDTH_LIMITED,
+                    1,
+                    -1,
+                    0,
+                );
+                q.add_scheduling_modes(&[gst::PadMode::Push]);
+                true
+            }
+            _ => BaseSrcImplExt::parent_query(self, element, query),
+        }
+    }
+
+    fn unlock(&self, _src: &Self::Type) -> Result<(), gst::ErrorMessage> {
+        // TODO: Here we abort the server
+        Ok(())
+    }
+}
+
+impl PushSrcImpl for RtmpSvrSrc {
+    fn create(&self, src: &Self::Type) -> Result<gst::Buffer, gst::FlowError> {
+        let mut state = self.state.lock().unwrap();
+        if let State::Started { .. } = *state {
+            let chunk = Bytes::from("Mock");
+            // Here we return the buffer
+            let size = chunk.len();
+            assert_ne!(chunk.len(), 0);
+
+            let buffer = gst::Buffer::from_slice(chunk);
+
+            Ok(buffer)
+        } else {
+            gst_debug!(CAT, obj: src, "End of stream");
+            Err(gst::FlowError::Eos)
+        }
+    }
+}

src/lib.rs

@@ -1,9 +1,11 @@
 use glib::prelude::*;
 
 mod imp;
+mod connection;
+mod server;
 
 glib::wrapper! {
-    pub struct RtmpSrvSrc(ObjectSubclass<imp::RtmpSvrSrc>) @extends gst_base::BaseSrc, gst::Element, gst::Object;
+    pub struct RtmpSrvSrc(ObjectSubclass<imp::RtmpSvrSrc>) @extends gst_base::PushSrc, gst_base::BaseSrc, gst::Element, gst::Object;
 }
 
 unsafe impl Send for RtmpSrvSrc {}

src/server.rs

@@ -0,0 +1,537 @@
+use std::collections::{HashMap, HashSet};
+use std::rc::Rc;
+use bytes::Bytes;
+use slab::Slab;
+use rml_rtmp::sessions::{ServerSession, ServerSessionConfig, ServerSessionResult, ServerSessionEvent};
+use rml_rtmp::sessions::StreamMetadata;
+use rml_rtmp::chunk_io::Packet;
+use rml_rtmp::time::RtmpTimestamp;
+
+enum ClientAction {
+    Waiting,
+    Publishing(String), // Publishing to a stream key
+    Watching {
+        stream_key: String,
+        stream_id: u32,
+    },
+}
+
+enum ReceivedDataType {Audio, Video}
+
+struct Client {
+    session: ServerSession,
+    current_action: ClientAction,
+    connection_id: usize,
+    has_received_video_keyframe: bool,
+}
+
+impl Client {
+    fn get_active_stream_id(&self) -> Option<u32> {
+        match self.current_action {
+            ClientAction::Waiting => None,
+            ClientAction::Publishing(_) => None,
+            ClientAction::Watching {stream_key: _, stream_id} => Some(stream_id),
+        }
+    }
+}
+
+struct MediaChannel {
+    publishing_client_id: Option<usize>,
+    watching_client_ids: HashSet<usize>,
+    metadata: Option<Rc<StreamMetadata>>,
+    video_sequence_header: Option<Bytes>,
+    audio_sequence_header: Option<Bytes>,
+}
+
+#[derive(Debug)]
+pub enum ServerResult {
+    DisconnectConnection {connection_id: usize},
+    OutboundPacket {
+        target_connection_id: usize,
+        packet: Packet,
+    }
+}
+
+pub struct Server {
+    clients: Slab<Client>,
+    connection_to_client_map: HashMap<usize, usize>,
+    channels: HashMap<String, MediaChannel>,
+}
+
+impl Server {
+    pub fn new() -> Server {
+        Server {
+            clients: Slab::with_capacity(1024),
+            connection_to_client_map: HashMap::with_capacity(1024),
+            channels: HashMap::new(),
+        }
+    }
+
+    pub fn bytes_received(&mut self, connection_id: usize, bytes: &[u8]) -> Result<Vec<ServerResult>, String> {
+        let mut server_results = Vec::new();
+
+        if !self.connection_to_client_map.contains_key(&connection_id) {
+            // Initiate new client connection
+            let config = ServerSessionConfig::new();
+            let (session, initial_session_results) = match ServerSession::new(config) {
+                Ok(results) => results,
+                Err(error) => return Err(error.to_string()),
+            };
+
+            self.handle_session_results(connection_id, initial_session_results, &mut server_results);
+            let client = Client {
+                session,
+                connection_id,
+                current_action: ClientAction::Waiting,
+                has_received_video_keyframe: false,
+            };
+
+            let client_id = Some(self.clients.insert(client));
+            self.connection_to_client_map.insert(connection_id, client_id.unwrap());
+        }
+
+        let client_results: Vec<ServerSessionResult>;
+        {
+            let client_id = self.connection_to_client_map.get(&connection_id).unwrap();
+            let client = self.clients.get_mut(*client_id).unwrap();
+            client_results = match client.session.handle_input(bytes) {
+                Ok(results) => results,
+                Err(error) => return Err(error.to_string()),
+            };
+        }
+
+        self.handle_session_results(connection_id, client_results, &mut server_results);
+        Ok(server_results)
+    }
+
+    pub fn notify_connection_closed(&mut self, connection_id: usize) {
+        match self.connection_to_client_map.remove(&connection_id) {
+            None => (),
+            Some(client_id) => {
+                let client = self.clients.remove(client_id);
+                match client.current_action {
+                    ClientAction::Publishing(stream_key) => self.publishing_ended(stream_key),
+                    ClientAction::Watching{stream_key, stream_id: _} => self.play_ended(client_id, stream_key),
+                    ClientAction::Waiting => (),
+                }
+            },
+        }
+    }
+
+    fn handle_session_results(&mut self,
+                              executed_connection_id: usize,
+                              session_results: Vec<ServerSessionResult>,
+                              server_results: &mut Vec<ServerResult>) {
+        for result in session_results {
+            match result {
+                ServerSessionResult::OutboundResponse(packet) => {
+                    server_results.push(ServerResult::OutboundPacket {
+                        target_connection_id: executed_connection_id,
+                        packet,
+                    })
+                },
+
+                ServerSessionResult::RaisedEvent(event) =>
+                    self.handle_raised_event(executed_connection_id, event, server_results),
+
+                x => println!("Server result received: {:?}", x),
+            }
+        }
+    }
+
+    fn handle_raised_event(&mut self,
+                           executed_connection_id: usize,
+                           event: ServerSessionEvent,
+                           server_results: &mut Vec<ServerResult>) {
+        match event {
+            ServerSessionEvent::ConnectionRequested {request_id, app_name} => {
+                self.handle_connection_requested(executed_connection_id, request_id, app_name, server_results);
+            },
+
+            ServerSessionEvent::PublishStreamRequested {request_id, app_name, stream_key, mode: _} => {
+                self.handle_publish_requested(executed_connection_id, request_id, app_name, stream_key, server_results);
+            },
+
+            ServerSessionEvent::PlayStreamRequested {request_id, app_name, stream_key, start_at: _, duration: _, reset: _, stream_id} => {
+                self.handle_play_requested(executed_connection_id, request_id, app_name, stream_key, stream_id, server_results);
+            },
+
+            ServerSessionEvent::StreamMetadataChanged {app_name, stream_key, metadata} => {
+                self.handle_metadata_received(app_name, stream_key, metadata, server_results);
+            },
+
+            ServerSessionEvent::VideoDataReceived {app_name: _, stream_key, data, timestamp} => {
+                self.handle_audio_video_data_received(stream_key, timestamp, data, ReceivedDataType::Video, server_results);
+            },
+
+            ServerSessionEvent::AudioDataReceived {app_name: _, stream_key, data, timestamp} => {
+                self.handle_audio_video_data_received(stream_key, timestamp, data, ReceivedDataType::Audio, server_results);
+            },
+
+            _ => println!("Event raised by connection {}: {:?}", executed_connection_id, event),
+        }
+    }
+
+    fn handle_connection_requested(&mut self,
+                                   requested_connection_id: usize,
+                                   request_id: u32,
+                                   app_name: String,
+                                   server_results: &mut Vec<ServerResult>) {
+        println!("Connection {} requested connection to app '{}'", requested_connection_id, app_name);
+
+        let accept_result;
+        {
+            let client_id = self.connection_to_client_map.get(&requested_connection_id).unwrap();
+            let client = self.clients.get_mut(*client_id).unwrap();
+            accept_result = client.session.accept_request(request_id);
+        }
+
+        match accept_result {
+            Err(error) => {
+                println!("Error occurred accepting connection request: {:?}", error);
+                server_results.push(ServerResult::DisconnectConnection {
+                    connection_id: requested_connection_id}
+                )
+            },
+
+            Ok(results) => {
+                self.handle_session_results(requested_connection_id, results, server_results);
+            }
+        }
+    }
+
+    fn handle_publish_requested(&mut self,
+                                requested_connection_id: usize,
+                                request_id: u32,
+                                app_name: String,
+                                stream_key: String,
+                                server_results: &mut Vec<ServerResult>) {
+        println!("Publish requested on app '{}' and stream key '{}'", app_name, stream_key);
+
+        match self.channels.get(&stream_key) {
+            None => (),
+            Some(channel) => match channel.publishing_client_id {
+                None => (),
+                Some(_) => {
+                    println!("Stream key already being published to");
+                    server_results.push(ServerResult::DisconnectConnection {connection_id: requested_connection_id});
+                    return;
+                }
+            }
+        }
+
+        let accept_result;
+        {
+            let client_id = self.connection_to_client_map.get(&requested_connection_id).unwrap();
+            let client = self.clients.get_mut(*client_id).unwrap();
+            client.current_action = ClientAction::Publishing(stream_key.clone());
+
+            let channel = self.channels
+                .entry(stream_key)
+                .or_insert(MediaChannel {
+                    publishing_client_id: None,
+                    watching_client_ids: HashSet::new(),
+                    metadata: None,
+                    video_sequence_header: None,
+                    audio_sequence_header: None,
+                });
+
+            channel.publishing_client_id = Some(*client_id);
+            accept_result = client.session.accept_request(request_id);
+        }
+
+        match accept_result {
+            Err(error) => {
+                println!("Error occurred accepting publish request: {:?}", error);
+                server_results.push(ServerResult::DisconnectConnection {
+                    connection_id: requested_connection_id}
+                )
+            },
+
+            Ok(results) => {
+                self.handle_session_results(requested_connection_id, results, server_results);
+            }
+        }
+    }
+
+    fn handle_play_requested(&mut self,
+                             requested_connection_id: usize,
+                             request_id: u32,
+                             app_name: String,
+                             stream_key: String,
+                             stream_id: u32,
+                             server_results: &mut Vec<ServerResult>) {
+        println!("Play requested on app '{}' and stream key '{}'", app_name, stream_key);
+
+        let accept_result;
+        {
+            let client_id = self.connection_to_client_map.get(&requested_connection_id).unwrap();
+            let client = self.clients.get_mut(*client_id).unwrap();
+            client.current_action = ClientAction::Watching {
+                stream_key: stream_key.clone(),
+                stream_id,
+            };
+
+            let channel = self.channels
+                .entry(stream_key.clone())
+                .or_insert(MediaChannel {
+                    publishing_client_id: None,
+                    watching_client_ids: HashSet::new(),
+                    metadata: None,
+                    video_sequence_header: None,
+                    audio_sequence_header: None,
+                });
+
+            channel.watching_client_ids.insert(*client_id);
+            accept_result = match client.session.accept_request(request_id) {
+                Err(error) => Err(error),
+                Ok(mut results) => {
+
+                    // If the channel already has existing metadata, send that to the new client
+                    // so they have up to date info
+                    match channel.metadata {
+                        None => (),
+                        Some(ref metadata) => {
+                            let packet = match client.session.send_metadata(stream_id, metadata.clone()) {
+                                Ok(packet) => packet,
+                                Err(error) => {
+                                    println!("Error occurred sending existing metadata to new client: {:?}", error);
+                                    server_results.push(ServerResult::DisconnectConnection {
+                                        connection_id: requested_connection_id}
+                                    );
+
+                                    return;
+                                },
+                            };
+
+                            results.push(ServerSessionResult::OutboundResponse(packet));
+                        }
+                    }
+
+                    // If the channel already has sequence headers, send them
+                    match channel.video_sequence_header {
+                        None => (),
+                        Some(ref data) => {
+                            let packet = match client.session.send_video_data(stream_id, data.clone(), RtmpTimestamp::new(0), false) {
+                                Ok(packet) => packet,
+                                Err(error) => {
+                                    println!("Error occurred sending video header to new client: {:?}", error);
+                                    server_results.push(ServerResult::DisconnectConnection {
+                                        connection_id: requested_connection_id}
+                                    );
+
+                                    return;
+                                },
+                            };
+
+                            results.push(ServerSessionResult::OutboundResponse(packet));
+                        }
+                    }
+
+                    match channel.audio_sequence_header {
+                        None => (),
+                        Some(ref data) => {
+                            let packet = match client.session.send_audio_data(stream_id, data.clone(), RtmpTimestamp::new(0), false) {
+                                Ok(packet) => packet,
+                                Err(error) => {
+                                    println!("Error occurred sending audio header to new client: {:?}", error);
+                                    server_results.push(ServerResult::DisconnectConnection {
+                                        connection_id: requested_connection_id}
+                                    );
+
+                                    return;
+                                },
+                            };
+
+                            results.push(ServerSessionResult::OutboundResponse(packet));
+                        }
+                    }
+
+                    Ok(results)
+                }
+            }
+        }
+
+        match accept_result {
+            Err(error) => {
+                println!("Error occurred accepting playback request: {:?}", error);
+                server_results.push(ServerResult::DisconnectConnection {
+                    connection_id: requested_connection_id}
+                );
+
+                return;
+            },
+
+            Ok(results) => {
+                self.handle_session_results(requested_connection_id, results, server_results);
+            }
+        }
+    }
+
+    fn handle_metadata_received(&mut self,
+                                app_name: String,
+                                stream_key: String,
+                                metadata: StreamMetadata,
+                                server_results: &mut Vec<ServerResult>) {
+        println!("New metadata received for app '{}' and stream key '{}'", app_name, stream_key);
+        let channel = match self.channels.get_mut(&stream_key) {
+            Some(channel) => channel,
+            None => return,
+        };
+
+        let metadata = Rc::new(metadata);
+        channel.metadata = Some(metadata.clone());
+
+        // Send the metadata to all current watchers
+        for client_id in &channel.watching_client_ids {
+            let client = match self.clients.get_mut(*client_id) {
+                Some(client) => client,
+                None => continue,
+            };
+
+            let active_stream_id = match client.get_active_stream_id() {
+                Some(stream_id) => stream_id,
+                None => continue,
+            };
+
+            match client.session.send_metadata(active_stream_id, metadata.clone()) {
+                Ok(packet) => {
+                    server_results.push(ServerResult::OutboundPacket {
+                        target_connection_id: client.connection_id,
+                        packet,
+                    })
+                },
+
+                Err(error) => {
+                    println!("Error sending metadata to client on connection id {}: {:?}", client.connection_id, error);
+                    server_results.push(ServerResult::DisconnectConnection {
+                        connection_id: client.connection_id
+                    });
+                },
+            }
+        }
+    }
+
+    fn handle_audio_video_data_received(&mut self,
+                                        stream_key: String,
+                                        timestamp: RtmpTimestamp,
+                                        data: Bytes,
+                                        data_type: ReceivedDataType,
+                                        server_results: &mut Vec<ServerResult>) {
+        let channel = match self.channels.get_mut(&stream_key) {
+            Some(channel) => channel,
+            None => return,
+        };
+
+        // If this is an audio or video sequence header we need to save it, so it can be
+        // distributed to any late coming watchers
+        match data_type {
+            ReceivedDataType::Video => {
+                if is_video_sequence_header(data.clone()) {
+                    channel.video_sequence_header = Some(data.clone());
+                }
+            },
+
+            ReceivedDataType::Audio => {
+                if is_audio_sequence_header(data.clone()) {
+                    channel.audio_sequence_header = Some(data.clone());
+                }
+            }
+        }
+
+        for client_id in &channel.watching_client_ids {
+            let client = match self.clients.get_mut(*client_id) {
+                Some(client) => client,
+                None => continue,
+            };
+
+            let active_stream_id = match client.get_active_stream_id() {
+                Some(stream_id) => stream_id,
+                None => continue,
+            };
+
+            let should_send_to_client = match data_type {
+                ReceivedDataType::Video => {
+                    client.has_received_video_keyframe ||
+                        (is_video_sequence_header(data.clone()) ||
+                            is_video_keyframe(data.clone()))
+                },
+
+                ReceivedDataType::Audio => {
+                    client.has_received_video_keyframe || is_audio_sequence_header(data.clone())
+                },
+            };
+
+            if !should_send_to_client {
+                continue;
+            }
+
+            let send_result = match data_type {
+                ReceivedDataType::Audio => client.session.send_audio_data(active_stream_id, data.clone(), timestamp.clone(), true),
+                ReceivedDataType::Video => {
+                    if is_video_keyframe(data.clone()) {
+                        client.has_received_video_keyframe = true;
+                    }
+
+                    client.session.send_video_data(active_stream_id, data.clone(), timestamp.clone(), true)
+                },
+            };
+
+            match send_result {
+                Ok(packet) => {
+                    server_results.push(ServerResult::OutboundPacket {
+                        target_connection_id: client.connection_id,
+                        packet,
+                    })
+                },
+
+                Err(error) => {
+                    println!("Error sending metadata to client on connection id {}: {:?}", client.connection_id, error);
+                    server_results.push(ServerResult::DisconnectConnection {
+                        connection_id: client.connection_id
+                    });
+                },
+            }
+        }
+    }
+
+    fn publishing_ended(&mut self, stream_key: String) {
+        let channel = match self.channels.get_mut(&stream_key) {
+            Some(channel) => channel,
+            None => return,
+        };
+
+        channel.publishing_client_id = None;
+        channel.metadata = None;
+    }
+
+    fn play_ended(&mut self, client_id: usize, stream_key: String) {
+        let channel = match self.channels.get_mut(&stream_key) {
+            Some(channel) => channel,
+            None => return,
+        };
+
+        channel.watching_client_ids.remove(&client_id);
+    }
+}
+
+fn is_video_sequence_header(data: Bytes) -> bool {
+    // This is assuming h264.
+    return data.len() >= 2 &&
+        data[0] == 0x17 &&
+        data[1] == 0x00;
+}
+
+fn is_audio_sequence_header(data: Bytes) -> bool {
+    // This is assuming aac
+    return data.len() >= 2 &&
+        data[0] == 0xaf &&
+        data[1] == 0x00;
+}
+
+fn is_video_keyframe(data: Bytes) -> bool {
+    // assumings h264
+    return data.len() >= 2 &&
+        data[0] == 0x17 &&
+        data[1] != 0x00; // 0x00 is the sequence header, don't count that for now
+}