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

webrtc-sys/include/livekit/peer_connection_factory.h

@@ -17,7 +17,10 @@
 #pragma once
 
 #include "api/peer_connection_interface.h"
+#include "media_stream.h"
 #include "peer_connection.h"
+#include "rtp_parameters.h"
+#include "rust/cxx.h"
 #include "webrtc.h"
 
 namespace livekit {
@@ -35,16 +38,24 @@ class PeerConnectionFactory {
   explicit PeerConnectionFactory(std::shared_ptr<RTCRuntime> rtc_runtime);
   ~PeerConnectionFactory();
 
-  std::unique_ptr<PeerConnection> create_peer_connection(
+  std::shared_ptr<PeerConnection> create_peer_connection(
       std::unique_ptr<NativeRTCConfiguration> config,
-      NativePeerConnectionObserver& observer) const;
+      NativePeerConnectionObserver* observer) const;
+
+  std::shared_ptr<VideoTrack> create_video_track(
+      rust::String label,
+      std::shared_ptr<AdaptedVideoTrackSource> source) const;
+
+  RtpCapabilities get_rtp_sender_capabilities(MediaType type) const;
+
+  RtpCapabilities get_rtp_receiver_capabilities(MediaType type) const;
 
  private:
   std::shared_ptr<RTCRuntime> rtc_runtime_;
   rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface> peer_factory_;
 };
 
-std::unique_ptr<PeerConnectionFactory> create_peer_connection_factory(
+std::shared_ptr<PeerConnectionFactory> create_peer_connection_factory(
     std::shared_ptr<RTCRuntime> rtc_runtime);
 std::unique_ptr<NativeRTCConfiguration> create_rtc_configuration(
     RTCConfiguration conf);