parseSdp function
Parse a full SDP body into its audio + optional video section. Reuses parseSdpAudio internally for the audio half so all the existing code paths keep working.
Implementation
SdpOffer parseSdp(String sdp) {
final audio = parseSdpAudio(sdp);
final video = _parseSdpVideo(sdp);
return SdpOffer(audio: audio, video: video);
}