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/src/rtp_transceiver.cpp

@@ -5,7 +5,128 @@
 #include "livekit/rtp_transceiver.h"
 
 namespace livekit {
+
+webrtc::RtpTransceiverInit to_native_rtp_transceiver_init(
+    RtpTransceiverInit init) {
+  {
+    webrtc::RtpTransceiverInit native;
+    native.direction =
+        static_cast<webrtc::RtpTransceiverDirection>(init.direction);
+    native.stream_ids = std::vector<std::string>(init.stream_ids.begin(),
+                                                 init.stream_ids.end());
+    for (auto encoding : init.send_encodings)
+      native.send_encodings.push_back(
+          to_native_rtp_encoding_paramters(encoding));
+    return native;
+  }
+}
+
 RtpTransceiver::RtpTransceiver(
     rtc::scoped_refptr<webrtc::RtpTransceiverInterface> transceiver)
     : transceiver_(std::move(transceiver)) {}
-}  // namespace livekit
+
+MediaType RtpTransceiver::media_type() const {
+  return static_cast<MediaType>(transceiver_->media_type());
+}
+
+rust::String RtpTransceiver::mid() const {
+  // The error/Result is converted into an Option in Rust (Wait for Option
+  // suport in cxx.rs) (value throws an error if there's no value)
+  return transceiver_->mid().value();
+}
+
+std::shared_ptr<RtpSender> RtpTransceiver::sender() const {
+  return std::make_shared<RtpSender>(transceiver_->sender());
+}
+
+std::shared_ptr<RtpReceiver> RtpTransceiver::receiver() const {
+  return std::make_shared<RtpReceiver>(transceiver_->receiver());
+}
+
+bool RtpTransceiver::stopped() const {
+  return transceiver_->stopped();
+}
+
+bool RtpTransceiver::stopping() const {
+  return transceiver_->stopping();
+}
+
+RtpTransceiverDirection RtpTransceiver::direction() const {
+  return static_cast<RtpTransceiverDirection>(transceiver_->direction());
+}
+
+void RtpTransceiver::set_direction(RtpTransceiverDirection direction) const {
+  auto error = transceiver_->SetDirectionWithError(
+      static_cast<webrtc::RtpTransceiverDirection>(direction));
+
+  if (!error.ok()) {
+    throw std::runtime_error(serialize_error(to_error(error)));
+  }
+}
+
+RtpTransceiverDirection RtpTransceiver::current_direction() const {
+  return static_cast<RtpTransceiverDirection>(
+      transceiver_->current_direction().value());
+}
+
+RtpTransceiverDirection RtpTransceiver::fired_direction() const {
+  return static_cast<RtpTransceiverDirection>(
+      transceiver_->fired_direction().value());
+}
+
+void RtpTransceiver::stop_standard() const {
+  auto error = transceiver_->StopStandard();
+  if (!error.ok())
+    throw std::runtime_error(serialize_error(to_error(error)));
+}
+
+void RtpTransceiver::set_codec_preferences(
+    rust::Vec<RtpCodecCapability> codecs) const {
+  std::vector<webrtc::RtpCodecCapability> std_codecs;
+  for (auto codec : codecs)
+    std_codecs.push_back(to_native_rtp_codec_capability(codec));
+
+  auto error = transceiver_->SetCodecPreferences(std_codecs);
+  if (!error.ok())
+    throw std::runtime_error(serialize_error(to_error(error)));
+}
+
+rust::Vec<RtpCodecCapability> RtpTransceiver::codec_preferences() const {
+  rust::Vec<RtpCodecCapability> rust;
+  for (auto codec : transceiver_->codec_preferences())
+    rust.push_back(to_rust_rtp_codec_capability(codec));
+
+  return rust;
+}
+
+rust::Vec<RtpHeaderExtensionCapability>
+RtpTransceiver::header_extensions_to_offer() const {
+  rust::Vec<RtpHeaderExtensionCapability> rust;
+  for (auto header : transceiver_->HeaderExtensionsToOffer())
+    rust.push_back(to_rust_rtp_header_extension_capability(header));
+
+  return rust;
+}
+
+rust::Vec<RtpHeaderExtensionCapability>
+RtpTransceiver::header_extensions_negotiated() const {
+  rust::Vec<RtpHeaderExtensionCapability> rust;
+  for (auto header : transceiver_->HeaderExtensionsNegotiated())
+    rust.push_back(to_rust_rtp_header_extension_capability(header));
+
+  return rust;
+}
+
+void RtpTransceiver::set_offered_rtp_header_extensions(
+    rust::Vec<RtpHeaderExtensionCapability> header_extensions_to_offer) const {
+  std::vector<webrtc::RtpHeaderExtensionCapability> headers;
+
+  for (auto header : header_extensions_to_offer)
+    headers.push_back(to_native_rtp_header_extension_capability(header));
+
+  auto error = transceiver_->SetOfferedRtpHeaderExtensions(headers);
+  if (!error.ok())
+    throw std::runtime_error(serialize_error(to_error(error)));
+}
+
+}  // namespace livekit