RtpTransceiver bindings & requirements for publishing tracks (#39)

- RtpSender
- RtpReceiver
- RtpTransceiver
- RtpParameters
- VideoFrameBuilder
- Interior mutability on c++ side
- Cleanup bindings ( Use #pragma once instead of include guards )
     - webrtc-sys/src/* headers are now used in only one place 
     - Avoid confusion between generated headers and our headers
- AdaptedVideoTrackSource
- Cleanup the workaround with unsupported Vec<Shared<T>>
    - Put everything inside one file

webrtc-sys/include/livekit/rtp_transceiver.h

@@ -2,27 +2,73 @@
 // Created by Théo Monnom on 02/09/2022.
 //
 
-#ifndef CLIENT_SDK_NATIVE_RTP_TRANSCEIVER_H
-#define CLIENT_SDK_NATIVE_RTP_TRANSCEIVER_H
+#pragma once
 
 #include <memory>
 
+#include "api/rtp_parameters.h"
+#include "api/rtp_transceiver_direction.h"
 #include "api/rtp_transceiver_interface.h"
+#include "livekit/rtc_error.h"
+#include "livekit/rtp_parameters.h"
+#include "livekit/rtp_receiver.h"
+#include "livekit/rtp_sender.h"
+#include "rust/cxx.h"
 
 namespace livekit {
+class RtpTransceiver;
+}
+#include "webrtc-sys/src/rtp_transceiver.rs.h"
+
+namespace livekit {
+
+webrtc::RtpTransceiverInit to_native_rtp_transceiver_init(
+    RtpTransceiverInit init);
 
 class RtpTransceiver {
  public:
   explicit RtpTransceiver(
       rtc::scoped_refptr<webrtc::RtpTransceiverInterface> transceiver);
 
+  MediaType media_type() const;
+
+  rust::String mid() const;
+
+  std::shared_ptr<RtpSender> sender() const;
+
+  std::shared_ptr<RtpReceiver> receiver() const;
+
+  bool stopped() const;
+
+  bool stopping() const;
+
+  RtpTransceiverDirection direction() const;
+
+  void set_direction(RtpTransceiverDirection direction) const;
+
+  RtpTransceiverDirection current_direction() const;
+
+  RtpTransceiverDirection fired_direction() const;
+
+  void stop_standard() const;
+
+  void set_codec_preferences(rust::Vec<RtpCodecCapability> codecs) const;
+
+  rust::Vec<RtpCodecCapability> codec_preferences() const;
+
+  rust::Vec<RtpHeaderExtensionCapability> header_extensions_to_offer() const;
+
+  rust::Vec<RtpHeaderExtensionCapability> header_extensions_negotiated() const;
+
+  void set_offered_rtp_header_extensions(
+      rust::Vec<RtpHeaderExtensionCapability> header_extensions_to_offer) const;
+
  private:
   rtc::scoped_refptr<webrtc::RtpTransceiverInterface> transceiver_;
 };
 
-static std::unique_ptr<RtpTransceiver> _unique_rtp_transceiver() {
-  return nullptr;  // Ignore
+static std::shared_ptr<RtpTransceiver> _shared_rtp_transceiver() {
+  return nullptr;
 }
-}  // namespace livekit
 
-#endif  // CLIENT_SDK_NATIVE_RTP_TRANSCEIVER_H
+}  // namespace livekit