feat: video publishing (#42)

- Prepare webrtc abstraction ( for future wasm support )
- Added track publish support for videos
  - Added LogoTrack example to simple_room demo
- Lot of cleanup
- There are compiler warnings I'll solve on our v1 release

livekit/src/room/mod.rs

@@ -1,3 +1,4 @@
+use self::track::RemoteTrack;
 use crate::participant::ConnectionQuality;
 use crate::prelude::*;
 use crate::proto;
@@ -10,6 +11,7 @@ use tokio::sync::mpsc;
 pub use crate::rtc_engine::SimulateScenario;
 
 pub mod id;
+pub mod options;
 pub mod participant;
 pub mod publication;
 pub mod room_session;
@@ -25,34 +27,36 @@ pub enum RoomError {
     Engine(#[from] EngineError),
     #[error("room failure: {0}")]
     Internal(String),
+    #[error("this track or a track of the same source is already published")]
+    TrackAlreadyPublished,
 }
 
 #[derive(Clone, Debug)]
 pub enum RoomEvent {
-    ParticipantConnected(Arc<RemoteParticipant>),
-    ParticipantDisconnected(Arc<RemoteParticipant>),
+    ParticipantConnected(RemoteParticipant),
+    ParticipantDisconnected(RemoteParticipant),
     TrackSubscribed {
-        track: RemoteTrackHandle,
+        track: RemoteTrack,
         publication: RemoteTrackPublication,
-        participant: Arc<RemoteParticipant>,
+        participant: RemoteParticipant,
     },
     TrackPublished {
         publication: RemoteTrackPublication,
-        participant: Arc<RemoteParticipant>,
+        participant: RemoteParticipant,
     },
     TrackUnpublished {
         publication: RemoteTrackPublication,
-        participant: Arc<RemoteParticipant>,
+        participant: RemoteParticipant,
     },
     TrackUnsubscribed {
-        track: RemoteTrackHandle,
+        track: RemoteTrack,
         publication: RemoteTrackPublication,
-        participant: Arc<RemoteParticipant>,
+        participant: RemoteParticipant,
     },
     TrackSubscriptionFailed {
         error: track::TrackError,
         sid: TrackSid,
-        participant: Arc<RemoteParticipant>,
+        participant: RemoteParticipant,
     },
     TrackMuted {
         participant: Participant,
@@ -72,7 +76,7 @@ pub enum RoomEvent {
     DataReceived {
         payload: Arc<Vec<u8>>,
         kind: proto::data_packet::Kind,
-        participant: Arc<RemoteParticipant>,
+        participant: RemoteParticipant,
     },
     ConnectionStateChanged(ConnectionState),
     Connected,