Refactor SDP offer/answer.

pkg/media/sdp/helpers.go

@@ -0,0 +1,45 @@
+// Copyright 2024 LiveKit, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sdp
+
+import (
+	"net/netip"
+
+	"github.com/pion/sdp/v3"
+)
+
+func GetAudio(s *sdp.SessionDescription) *sdp.MediaDescription {
+	for _, m := range s.MediaDescriptions {
+		if m.MediaName.Media == "audio" {
+			return m
+		}
+	}
+	return nil
+}
+
+func GetAudioDest(s *sdp.SessionDescription, audio *sdp.MediaDescription) netip.AddrPort {
+	if audio == nil || s == nil {
+		return netip.AddrPort{}
+	}
+	ci := s.ConnectionInformation
+	if ci == nil || ci.NetworkType != "IN" {
+		return netip.AddrPort{}
+	}
+	ip, err := netip.ParseAddr(ci.Address.Address)
+	if err != nil {
+		return netip.AddrPort{}
+	}
+	return netip.AddrPortFrom(ip, uint16(audio.MediaName.Port.Value))
+}