support publishing with WebRTC (#1659) (#1786)

internal/formatprocessor/unit.go

@@ -8,6 +8,9 @@ import (
 
 // Unit is the elementary data unit routed across the server.
 type Unit interface {
+	// returns RTP packets contained into the unit.
 	GetRTPPackets() []*rtp.Packet
+
+	// returns the NTP timestamp of the unit.
 	GetNTP() time.Time
 }