Move connections to their own package.

conn/conn.go

@@ -0,0 +1,48 @@
+// Copyright (c) 2020 by Juliusz Chroboczek.
+
+// This is not open source software.  Copy it, and I'll break into your
+// house and tell your three year-old that Santa doesn't exist.
+
+// Package conn defines interfaces for connections and tracks.
+package conn
+
+import (
+	"errors"
+
+	"github.com/pion/rtp"
+	"github.com/pion/webrtc/v3"
+)
+
+var ErrConnectionClosed = errors.New("connection is closed")
+var ErrKeyframeNeeded = errors.New("keyframe needed")
+
+// Type Up represents a connection in the client to server direction.
+type Up interface {
+	AddLocal(Down) error
+	DelLocal(Down) bool
+	Id() string
+	Label() string
+}
+
+// Type UpTrack represents a track in the client to server direction.
+type UpTrack interface {
+	AddLocal(DownTrack) error
+	DelLocal(DownTrack) bool
+	Label() string
+	Codec() *webrtc.RTPCodec
+	// get a recent packet.  Returns 0 if the packet is not in cache.
+	GetRTP(seqno uint16, result []byte) uint16
+}
+
+// Type Down represents a connection in the server to client direction.
+type Down interface {
+	GetMaxBitrate(now uint64) uint64
+}
+
+// Type DownTrack represents a track in the server to client direction.
+type DownTrack interface {
+	WriteRTP(packat *rtp.Packet) error
+	Accumulate(bytes uint32)
+	SetTimeOffset(ntp uint64, rtp uint32)
+	SetCname(string)
+}