public override async Task OnSdpAnswerAsync(RelayMessage message)
{
await Context.PeerConnection.SetRemoteDescription(new RTCSessionDescription(RTCSdpType.Answer, message.Payload));
if (SdpUtils.IsHold(message.Payload))
{
await Context.SwitchState(new Held());
}
else
{
await Context.SwitchState(new Active());
}
}
public override async Task OnSdpOfferAsync(RelayMessage message)
{
bool isHold = SdpUtils.IsHold(message.Payload);
if (isHold)
{
Context.VoipHelper.SetCallHeld();
}
else
{
Context.VoipHelper.SetCallActive(Context.PeerId, Context.IsVideoEnabled);
}
// If PeerConnection is not null, then this is an SDP renegotiation.
if (Context.PeerConnection == null)
{
var config = new RTCConfiguration
{
IceServers = WebRtcSettingsUtils.ToRTCIceServer(IceServerSettings.IceServers)
};
Context.PeerConnection = new RTCPeerConnection(config);
}
if (isHold)
{
// Even for just a renegotiation, it's easier to just teardown the media capture and start over.
if (Context.LocalStream != null)
{
Context.PeerConnection.RemoveStream(Context.LocalStream);
}
Context.LocalStream?.Stop();
Context.LocalStream = null;
Context.RemoteStream?.Stop();
Context.RemoteStream = null;
Context.ResetRenderers();
}
MediaVideoTrack oldVideoTrack = Context.RemoteStream?.GetVideoTracks()?.FirstOrDefault();
await Context.PeerConnection.SetRemoteDescription(new RTCSessionDescription(RTCSdpType.Offer, message.Payload));
MediaVideoTrack newVideoTrack = Context.RemoteStream?.GetVideoTracks()?.FirstOrDefault();
bool videoTrackChanged = oldVideoTrack != null && newVideoTrack != null &&
oldVideoTrack.Id.CompareTo(newVideoTrack.Id) != 0;
if (videoTrackChanged)
{
Context.ResetRemoteRenderer();
var source = RtcManager.Instance.Media.CreateMediaSource(newVideoTrack, CallContext.PeerMediaStreamId);
Context.RemoteVideoRenderer.SetupRenderer(Context.ForegroundProcessId, source, Context.RemoteVideoControlSize);
}
else if (!isHold)
{
Context.LocalStream = await RtcManager.Instance.Media.GetUserMedia(new RTCMediaStreamConstraints
{
videoEnabled = Context.IsVideoEnabled,
audioEnabled = true
});
Context.PeerConnection.AddStream(Context.LocalStream);
// Setup the rendering of the local capture.
var tracks = Context.LocalStream.GetVideoTracks();
if (tracks.Count > 0)
{
var source = RtcManager.Instance.Media.CreateMediaSource(tracks[0], CallContext.LocalMediaStreamId);
Context.LocalVideoRenderer.SetupRenderer(Context.ForegroundProcessId, source, Context.LocalVideoControlSize);
}
}
var sdpAnswer = await Context.PeerConnection.CreateAnswer();
await Context.PeerConnection.SetLocalDescription(sdpAnswer);
var sdpVideoCodecIds = SdpUtils.GetVideoCodecIds(message.Payload);
if (sdpVideoCodecIds.Count > 0)
{
Context.VideoCodecUsed = Array.Find((await Hub.Instance.MediaSettingsChannel.GetVideoCodecsAsync())?.Codecs,
it => it.Id == sdpVideoCodecIds.First())?.FromDto();
}
Context.SendToPeer(RelayMessageTags.SdpAnswer, sdpAnswer.Sdp);
if (isHold)
{
await Context.SwitchState(new Held());
}
else
{
await Context.SwitchState(new Active());
}
}