feat: audio support (#45)

- Receive/Send audio frames
- LocalAudioTrack

webrtc-sys/src/peer_connection_factory.cpp

@@ -25,11 +25,14 @@
 #include "api/task_queue/default_task_queue_factory.h"
 #include "api/video_codecs/builtin_video_decoder_factory.h"
 #include "api/video_codecs/builtin_video_encoder_factory.h"
+#include "livekit/audio_device.h"
 #include "livekit/rtc_error.h"
 #include "livekit/rtp_parameters.h"
 #include "livekit/video_decoder_factory.h"
 #include "livekit/video_encoder_factory.h"
 #include "media/engine/webrtc_media_engine.h"
+#include "rtc_base/location.h"
+#include "rtc_base/thread.h"
 
 namespace livekit {
 
@@ -51,6 +54,14 @@ PeerConnectionFactory::PeerConnectionFactory(
 
   cricket::MediaEngineDependencies media_deps;
   media_deps.task_queue_factory = dependencies.task_queue_factory.get();
+
+  media_deps.adm = rtc_runtime_->worker_thread()
+                       ->Invoke<rtc::scoped_refptr<livekit::AudioDevice>>(
+                           RTC_FROM_HERE, [&] {
+                             return rtc::make_ref_counted<livekit::AudioDevice>(
+                                 media_deps.task_queue_factory);
+                           });
+
   media_deps.video_encoder_factory =
       std::move(std::make_unique<livekit::VideoEncoderFactory>());
   media_deps.video_decoder_factory =
@@ -96,6 +107,13 @@ std::shared_ptr<VideoTrack> PeerConnectionFactory::create_video_track(
       peer_factory_->CreateVideoTrack(label.c_str(), source->get().get()));
 }
 
+std::shared_ptr<AudioTrack> PeerConnectionFactory::create_audio_track(
+    rust::String label,
+    std::shared_ptr<AudioTrackSource> source) const {
+  return std::make_shared<AudioTrack>(
+      peer_factory_->CreateAudioTrack(label.c_str(), source->get().get()));
+}
+
 RtpCapabilities PeerConnectionFactory::get_rtp_sender_capabilities(
     MediaType type) const {
   return to_rust_rtp_capabilities(peer_factory_->GetRtpSenderCapabilities(