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using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Unity.WebRTC;
using System.Text.RegularExpressions;
namespace Unity.RenderStreaming
{
[Serializable]
public class ButtonClickEvent : UnityEngine.Events.UnityEvent<int> { }
[Serializable]
public class ButtonClickElement
{
[Tooltip("Specifies the ID on the HTML")]
public int elementId;
public ButtonClickEvent click;
}
public class RenderStreaming : MonoBehaviour
{
#pragma warning disable 0649
[SerializeField, Tooltip("Address for signaling server")]
private string urlSignaling = "http://localhost";
[SerializeField, Tooltip("Array to set your own STUN/TURN servers")]
private RTCIceServer[] iceServers = new RTCIceServer[]
{
new RTCIceServer()
{
urls = new string[] { "stun:stun.l.google.com:19302" }
}
};
[SerializeField, Tooltip("Streaming size should match display aspect ratio")]
private Vector2Int streamingSize = new Vector2Int(1280, 720);
[SerializeField, Tooltip("Time interval for polling from signaling server")]
private float interval = 5.0f;
[SerializeField, Tooltip("Camera to capture video stream")]
private Camera captureCamera;
[SerializeField, Tooltip("Enable or disable hardware encoder")]
private bool hardwareEncoderSupport = true;
[SerializeField, Tooltip("Array to set your own click event")]
private ButtonClickElement[] arrayButtonClickEvent;
#pragma warning restore 0649
private Signaling signaling;
private Dictionary<string, RTCPeerConnection> pcs = new Dictionary<string, RTCPeerConnection>();
private Dictionary<RTCPeerConnection, Dictionary<int, RTCDataChannel>> mapChannels = new Dictionary<RTCPeerConnection, Dictionary<int, RTCDataChannel>>();
private RTCConfiguration conf;
private string sessionId;
private MediaStream videoStream;
private MediaStream audioStream;
public void Awake()
{
var encoderType = hardwareEncoderSupport ? EncoderType.Hardware : EncoderType.Software;
WebRTC.WebRTC.Initialize(encoderType);
RemoteInput.Initialize();
RemoteInput.ActionButtonClick = OnButtonClick;
}
public void OnDestroy()
{
WebRTC.WebRTC.Finalize();
RemoteInput.Destroy();
Unity.WebRTC.Audio.Stop();
}
public IEnumerator Start()
{
if (captureCamera == null)
{
captureCamera = Camera.main;
}
videoStream = captureCamera.CaptureStream(streamingSize.x, streamingSize.y, RenderTextureDepth.DEPTH_24);
audioStream = Unity.WebRTC.Audio.CaptureStream();
signaling = new Signaling(urlSignaling);
var opCreate = signaling.Create();
yield return opCreate;
if (opCreate.webRequest.isNetworkError)
{
Debug.LogError($"Network Error: {opCreate.webRequest.error}");
yield break;
}
var newResData = opCreate.webRequest.DownloadHandlerJson<NewResData>().GetObject();
sessionId = newResData.sessionId;
conf = default;
conf.iceServers = iceServers;
StartCoroutine(WebRTC.WebRTC.Update());
StartCoroutine(LoopPolling());
}
public Vector2Int GetStreamingSize() { return streamingSize; }
long lastTimeGetOfferRequest = 0;
long lastTimeGetCandidateRequest = 0;
IEnumerator LoopPolling()
{
// ignore messages arrived before 30 secs ago
lastTimeGetOfferRequest = DateTime.UtcNow.ToJsMilliseconds() - 30000;
lastTimeGetCandidateRequest = DateTime.UtcNow.ToJsMilliseconds() - 30000;
while (true)
{
yield return StartCoroutine(GetOffer());
yield return StartCoroutine(GetCandidate());
yield return new WaitForSeconds(interval);
}
}
IEnumerator GetOffer()
{
var op = signaling.GetOffer(sessionId, lastTimeGetOfferRequest);
yield return op;
if (op.webRequest.isNetworkError)
{
Debug.LogError($"Network Error: {op.webRequest.error}");
yield break;
}
var date = DateTimeExtension.ParseHttpDate(op.webRequest.GetResponseHeader("Date"));
lastTimeGetOfferRequest = date.ToJsMilliseconds();
var obj = op.webRequest.DownloadHandlerJson<OfferResDataList>().GetObject();
if (obj == null)
{
yield break;
}
foreach (var offer in obj.offers)
{
RTCSessionDescription _desc;
_desc.type = RTCSdpType.Offer;
_desc.sdp = offer.sdp;
var connectionId = offer.connectionId;
if (pcs.ContainsKey(connectionId))
{
continue;
}
var pc = new RTCPeerConnection();
pcs.Add(offer.connectionId, pc);
pc.OnDataChannel = new DelegateOnDataChannel(channel => { OnDataChannel(pc, channel); });
pc.SetConfiguration(ref conf);
pc.OnIceCandidate = new DelegateOnIceCandidate(candidate => { StartCoroutine(OnIceCandidate(offer.connectionId, candidate)); });
pc.OnIceConnectionChange = new DelegateOnIceConnectionChange(state =>
{
if(state == RTCIceConnectionState.Disconnected)
{
pc.Close();
}
});
//make video bit rate starts at 16000kbits, and 160000kbits at max.
string pattern = @"(a=fmtp:\d+ .*level-asymmetry-allowed=.*)\r\n";
_desc.sdp = Regex.Replace(_desc.sdp, pattern, "$1;x-google-start-bitrate=16000;x-google-max-bitrate=160000\r\n");
pc.SetRemoteDescription(ref _desc);
foreach (var track in videoStream.GetTracks())
{
pc.AddTrack(track);
}
foreach(var track in audioStream.GetTracks())
{
pc.AddTrack(track);
}
StartCoroutine(Answer(connectionId));
}
}
IEnumerator Answer(string connectionId)
{
RTCAnswerOptions options = default;
var pc = pcs[connectionId];
var op = pc.CreateAnswer(ref options);
yield return op;
if (op.isError)
{
Debug.LogError($"Network Error: {op.error}");
yield break;
}
var opLocalDesc = pc.SetLocalDescription(ref op.desc);
yield return opLocalDesc;
if (opLocalDesc.isError)
{
Debug.LogError($"Network Error: {opLocalDesc.error}");
yield break;
}
var op3 = signaling.PostAnswer(this.sessionId, connectionId, op.desc.sdp);
yield return op3;
if (op3.webRequest.isNetworkError)
{
Debug.LogError($"Network Error: {op3.webRequest.error}");
yield break;
}
}
IEnumerator GetCandidate()
{
var op = signaling.GetCandidate(sessionId, lastTimeGetCandidateRequest);
yield return op;
if (op.webRequest.isNetworkError)
{
Debug.LogError($"Network Error: {op.webRequest.error}");
yield break;
}
var date = DateTimeExtension.ParseHttpDate(op.webRequest.GetResponseHeader("Date"));
lastTimeGetCandidateRequest = date.ToJsMilliseconds();
var obj = op.webRequest.DownloadHandlerJson<CandidateContainerResDataList>().GetObject();
if (obj == null)
{
yield break;
}
foreach (var candidateContainer in obj.candidates)
{
RTCPeerConnection pc;
if (!pcs.TryGetValue(candidateContainer.connectionId, out pc))
{
continue;
}
foreach (var candidate in candidateContainer.candidates)
{
RTCIceCandidate _candidate = default;
_candidate.candidate = candidate.candidate;
_candidate.sdpMLineIndex = candidate.sdpMLineIndex;
_candidate.sdpMid = candidate.sdpMid;
pcs[candidateContainer.connectionId].AddIceCandidate(ref _candidate);
}
}
}
IEnumerator OnIceCandidate(string connectionId, RTCIceCandidate candidate)
{
var opCandidate = signaling.PostCandidate(sessionId, connectionId, candidate.candidate, candidate.sdpMid, candidate.sdpMLineIndex);
yield return opCandidate;
if (opCandidate.webRequest.isNetworkError)
{
Debug.LogError($"Network Error: {opCandidate.webRequest.error}");
yield break;
}
}
void OnDataChannel(RTCPeerConnection pc, RTCDataChannel channel)
{
Dictionary<int, RTCDataChannel> channels;
if (!mapChannels.TryGetValue(pc, out channels))
{
channels = new Dictionary<int, RTCDataChannel>();
mapChannels.Add(pc, channels);
}
channels.Add(channel.Id, channel);
if(channel.Label == "data")
{
channel.OnMessage = new DelegateOnMessage(bytes => { RemoteInput.ProcessInput(bytes); });
channel.OnClose = new DelegateOnClose(() => { RemoteInput.Reset(); });
}
}
void OnButtonClick(int elementId)
{
foreach (var element in arrayButtonClickEvent)
{
if (element.elementId == elementId)
{
element.click.Invoke(elementId);
}
}
}
}
}
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