Add call protocol, Rmux. Update AmneziaWG. Fixes and improvements

transport/call/common/signaling.go

@@ -0,0 +1,89 @@
+package common
+
+import (
+	"fmt"
+
+	"github.com/pion/rtp"
+	"github.com/pion/rtp/codecs"
+	"github.com/pion/webrtc/v4"
+	"github.com/sagernet/sing/common/logger"
+)
+
+func AddTunnelTracks(pc *webrtc.PeerConnection, logger logger.ContextLogger, prefix string) *webrtc.TrackLocalStaticSample {
+	sampleTrack, _ := webrtc.NewTrackLocalStaticSample(
+		webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeVP8},
+		"video", "tunnel-video",
+	)
+	audioTrack, _ := webrtc.NewTrackLocalStaticRTP(
+		webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeOpus},
+		"audio", "tunnel-audio",
+	)
+	audioSender, audioErr := pc.AddTrack(audioTrack)
+	videoSender, videoErr := pc.AddTrack(sampleTrack)
+	logger.Debug(fmt.Sprintf("%s: AddTrack audio: sender=%v err=%v", prefix, audioSender != nil, audioErr))
+	logger.Debug(fmt.Sprintf("%s: AddTrack video: sender=%v err=%v", prefix, videoSender != nil, videoErr))
+	logger.Debug(fmt.Sprintf("%s: senders count: %d", prefix, len(pc.GetSenders())))
+	return sampleTrack
+}
+
+func ReadTrack(track *webrtc.TrackRemote, handler func([]byte), logger logger.ContextLogger, prefix string) {
+	if track.Codec().MimeType != webrtc.MimeTypeVP8 {
+		buf := make([]byte, UDPBufSize)
+		for {
+			if _, _, err := track.Read(buf); err != nil {
+				return
+			}
+		}
+	}
+	var vp8Pkt codecs.VP8Packet
+	var pkt rtp.Packet
+	var frameBuf []byte
+	var lastSeq uint16
+	var haveLastSeq bool
+	frameValid := false
+	recvCount := 0
+	buf := make([]byte, RTPBufSize)
+	for {
+		n, _, err := track.Read(buf)
+		if err != nil {
+			return
+		}
+		if pkt.Unmarshal(buf[:n]) != nil {
+			continue
+		}
+		if haveLastSeq && pkt.SequenceNumber != lastSeq+1 {
+			frameValid = false
+			frameBuf = frameBuf[:0]
+		}
+		lastSeq = pkt.SequenceNumber
+		haveLastSeq = true
+		vp8Payload, err := vp8Pkt.Unmarshal(pkt.Payload)
+		if err != nil {
+			frameValid = false
+			frameBuf = frameBuf[:0]
+			continue
+		}
+		if vp8Pkt.S == 1 {
+			frameBuf = frameBuf[:0]
+			frameValid = true
+		}
+		if !frameValid {
+			continue
+		}
+		frameBuf = append(frameBuf, vp8Payload...)
+		if !pkt.Marker {
+			continue
+		}
+		recvCount++
+		if recvCount <= 3 || recvCount%200 == 0 {
+			logger.Debug(fmt.Sprintf("%s: recv vp8 frame #%d %d bytes", prefix, recvCount, len(frameBuf)))
+		}
+		if handler != nil {
+			frame := make([]byte, len(frameBuf))
+			copy(frame, frameBuf)
+			handler(frame)
+		}
+		frameBuf = frameBuf[:0]
+		frameValid = false
+	}
+}