432 lines
14 KiB
C#
432 lines
14 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using Unity.WebRTC;
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using Unity.WebRTC.Samples;
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using UnityEngine;
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using UnityEngine.UI;
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using Button = UnityEngine.UI.Button;
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class ChangeCodecsSample : MonoBehaviour
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{
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#pragma warning disable 0649
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[SerializeField] private Dropdown codecSelector;
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[SerializeField] private Button startButton;
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[SerializeField] private Button callButton;
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[SerializeField] private Button hangUpButton;
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[SerializeField] private Text actualCodecText;
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[SerializeField] private Camera cam;
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[SerializeField] private RawImage sourceImage;
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[SerializeField] private RawImage receiveImage;
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[SerializeField] private Transform rotateObject;
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#pragma warning restore 0649
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private RTCPeerConnection _pc1, _pc2;
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private List<RTCRtpSender> pc1Senders;
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private MediaStream videoStream, receiveStream;
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private DelegateOnIceConnectionChange pc1OnIceConnectionChange;
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private DelegateOnIceConnectionChange pc2OnIceConnectionChange;
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private DelegateOnIceCandidate pc1OnIceCandidate;
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private DelegateOnIceCandidate pc2OnIceCandidate;
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private DelegateOnTrack pc2Ontrack;
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private DelegateOnNegotiationNeeded pc1OnNegotiationNeeded;
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private bool videoUpdateStarted;
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private readonly string[] excludeCodecMimeType = { "video/red", "video/ulpfec", "video/rtx" };
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private RTCRtpCodecCapability[] availableCodecs;
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private void Awake()
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{
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startButton.onClick.AddListener(OnStart);
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callButton.onClick.AddListener(Call);
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hangUpButton.onClick.AddListener(HangUp);
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receiveStream = new MediaStream();
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}
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private void Start()
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{
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pc1Senders = new List<RTCRtpSender>();
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callButton.interactable = true;
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hangUpButton.interactable = false;
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codecSelector.interactable = false;
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pc1OnIceConnectionChange = state => { OnIceConnectionChange(_pc1, state); };
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pc2OnIceConnectionChange = state => { OnIceConnectionChange(_pc2, state); };
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pc1OnIceCandidate = candidate => { OnIceCandidate(_pc1, candidate); };
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pc2OnIceCandidate = candidate => { OnIceCandidate(_pc2, candidate); };
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pc2Ontrack = e =>
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{
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receiveStream.AddTrack(e.Track);
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};
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pc1OnNegotiationNeeded = () => { StartCoroutine(PeerNegotiationNeeded(_pc1)); };
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receiveStream.OnAddTrack = e =>
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{
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if (e.Track is VideoStreamTrack track)
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{
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track.OnVideoReceived += tex =>
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{
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receiveImage.texture = tex;
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receiveImage.color = Color.white;
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};
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}
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};
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}
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private void OnStart()
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{
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var capabilities = RTCRtpSender.GetCapabilities(TrackKind.Video);
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availableCodecs =
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capabilities.codecs.Where(codec => !excludeCodecMimeType.Contains(codec.mimeType)).ToArray();
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var list = availableCodecs
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.Select(codec => new Dropdown.OptionData { text = codec.mimeType + " " + codec.sdpFmtpLine })
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.ToList();
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codecSelector.options.AddRange(list);
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codecSelector.interactable = true;
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startButton.interactable = false;
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}
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private void Update()
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{
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if (rotateObject != null)
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{
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float t = Time.deltaTime;
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rotateObject.Rotate(100 * t, 200 * t, 300 * t);
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}
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}
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private static RTCConfiguration GetSelectedSdpSemantics()
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{
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RTCConfiguration config = default;
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config.iceServers = new[] { new RTCIceServer { urls = new[] { "stun:stun.l.google.com:19302" } } };
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return config;
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}
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private void OnIceConnectionChange(RTCPeerConnection pc, RTCIceConnectionState state)
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{
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switch (state)
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{
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case RTCIceConnectionState.New:
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Debug.Log($"{GetName(pc)} IceConnectionState: New");
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break;
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case RTCIceConnectionState.Checking:
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Debug.Log($"{GetName(pc)} IceConnectionState: Checking");
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break;
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case RTCIceConnectionState.Closed:
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Debug.Log($"{GetName(pc)} IceConnectionState: Closed");
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break;
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case RTCIceConnectionState.Completed:
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Debug.Log($"{GetName(pc)} IceConnectionState: Completed");
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break;
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case RTCIceConnectionState.Connected:
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Debug.Log($"{GetName(pc)} IceConnectionState: Connected");
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break;
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case RTCIceConnectionState.Disconnected:
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Debug.Log($"{GetName(pc)} IceConnectionState: Disconnected");
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break;
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case RTCIceConnectionState.Failed:
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Debug.Log($"{GetName(pc)} IceConnectionState: Failed");
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break;
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case RTCIceConnectionState.Max:
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Debug.Log($"{GetName(pc)} IceConnectionState: Max");
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break;
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default:
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throw new ArgumentOutOfRangeException(nameof(state), state, null);
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}
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}
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IEnumerator PeerNegotiationNeeded(RTCPeerConnection pc)
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{
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var op = pc.CreateOffer();
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yield return op;
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if (!op.IsError)
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{
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if (pc.SignalingState != RTCSignalingState.Stable)
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{
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Debug.LogError($"{GetName(pc)} signaling state is not stable.");
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yield break;
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}
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yield return StartCoroutine(OnCreateOfferSuccess(pc, op.Desc));
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}
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else
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{
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OnCreateSessionDescriptionError(op.Error);
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}
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}
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private void AddTracks()
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{
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foreach (var track in videoStream.GetTracks())
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{
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pc1Senders.Add(_pc1.AddTrack(track, videoStream));
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}
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if (!videoUpdateStarted)
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{
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StartCoroutine(WebRTC.Update());
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videoUpdateStarted = true;
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}
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RTCRtpCodecCapability[] codecs = null;
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if (codecSelector.value == 0)
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{
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codecs = RTCRtpSender.GetCapabilities(TrackKind.Video).codecs;
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}
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else
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{
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RTCRtpCodecCapability preferredCodec = availableCodecs[codecSelector.value - 1];
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codecs = new[] { preferredCodec };
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}
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RTCRtpTransceiver transceiver = _pc1.GetTransceivers().First();
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RTCErrorType error = transceiver.SetCodecPreferences(codecs);
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if (error != RTCErrorType.None)
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{
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Debug.LogErrorFormat("RTCRtpTransceiver.SetCodecPreferences failed. {0}", error);
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}
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}
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private void RemoveTracks()
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{
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foreach (var sender in pc1Senders)
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{
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_pc1.RemoveTrack(sender);
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}
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pc1Senders.Clear();
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MediaStreamTrack[] tracks = receiveStream.GetTracks().ToArray();
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foreach (var track in tracks)
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{
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receiveStream.RemoveTrack(track);
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track.Dispose();
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}
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}
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private void Call()
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{
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callButton.interactable = false;
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hangUpButton.interactable = true;
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codecSelector.interactable = false;
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var configuration = GetSelectedSdpSemantics();
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_pc1 = new RTCPeerConnection(ref configuration);
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_pc1.OnIceCandidate = pc1OnIceCandidate;
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_pc1.OnIceConnectionChange = pc1OnIceConnectionChange;
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_pc1.OnNegotiationNeeded = pc1OnNegotiationNeeded;
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_pc2 = new RTCPeerConnection(ref configuration);
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_pc2.OnIceCandidate = pc2OnIceCandidate;
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_pc2.OnIceConnectionChange = pc2OnIceConnectionChange;
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_pc2.OnTrack = pc2Ontrack;
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if (videoStream == null)
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{
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videoStream = cam.CaptureStream(WebRTCSettings.StreamSize.x, WebRTCSettings.StreamSize.y);
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}
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sourceImage.texture = cam.targetTexture;
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sourceImage.color = Color.white;
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AddTracks();
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}
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private void HangUp()
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{
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RemoveTracks();
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_pc1.Close();
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_pc2.Close();
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_pc1.Dispose();
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_pc2.Dispose();
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_pc1 = null;
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_pc2 = null;
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callButton.interactable = true;
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hangUpButton.interactable = false;
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codecSelector.interactable = true;
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codecSelector.value = 0;
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actualCodecText.text = string.Empty;
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sourceImage.color = Color.black;
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receiveImage.color = Color.black;
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}
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private void OnIceCandidate(RTCPeerConnection pc, RTCIceCandidate candidate)
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{
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GetOtherPc(pc).AddIceCandidate(candidate);
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Debug.Log($"{GetName(pc)} ICE candidate:\n {candidate.Candidate}");
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}
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private string GetName(RTCPeerConnection pc)
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{
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return (pc == _pc1) ? "pc1" : "pc2";
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}
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private RTCPeerConnection GetOtherPc(RTCPeerConnection pc)
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{
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return (pc == _pc1) ? _pc2 : _pc1;
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}
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private IEnumerator OnCreateOfferSuccess(RTCPeerConnection pc, RTCSessionDescription desc)
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{
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Debug.Log($"Offer from {GetName(pc)}\n{desc.sdp}");
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Debug.Log($"{GetName(pc)} setLocalDescription start");
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var op = pc.SetLocalDescription(ref desc);
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yield return op;
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if (!op.IsError)
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{
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OnSetLocalSuccess(pc);
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}
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else
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{
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var error = op.Error;
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OnSetSessionDescriptionError(ref error);
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}
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var otherPc = GetOtherPc(pc);
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Debug.Log($"{GetName(otherPc)} setRemoteDescription start");
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var op2 = otherPc.SetRemoteDescription(ref desc);
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yield return op2;
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if (!op2.IsError)
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{
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OnSetRemoteSuccess(otherPc);
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}
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else
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{
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var error = op2.Error;
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OnSetSessionDescriptionError(ref error);
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}
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Debug.Log($"{GetName(otherPc)} createAnswer start");
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// Since the 'remote' side has no media stream we need
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// to pass in the right constraints in order for it to
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// accept the incoming offer of audio and video.
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var op3 = otherPc.CreateAnswer();
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yield return op3;
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if (!op3.IsError)
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{
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yield return OnCreateAnswerSuccess(otherPc, op3.Desc);
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}
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else
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{
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OnCreateSessionDescriptionError(op3.Error);
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}
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}
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private void OnSetLocalSuccess(RTCPeerConnection pc)
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{
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Debug.Log($"{GetName(pc)} SetLocalDescription complete");
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}
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static void OnSetSessionDescriptionError(ref RTCError error)
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{
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Debug.LogError($"Error Detail Type: {error.message}");
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}
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private void OnSetRemoteSuccess(RTCPeerConnection pc)
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{
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Debug.Log($"{GetName(pc)} SetRemoteDescription complete");
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}
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IEnumerator OnCreateAnswerSuccess(RTCPeerConnection pc, RTCSessionDescription desc)
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{
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Debug.Log($"Answer from {GetName(pc)}:\n{desc.sdp}");
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Debug.Log($"{GetName(pc)} setLocalDescription start");
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var op = pc.SetLocalDescription(ref desc);
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yield return op;
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if (!op.IsError)
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{
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OnSetLocalSuccess(pc);
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}
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else
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{
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var error = op.Error;
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OnSetSessionDescriptionError(ref error);
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}
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var otherPc = GetOtherPc(pc);
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Debug.Log($"{GetName(otherPc)} setRemoteDescription start");
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var op2 = otherPc.SetRemoteDescription(ref desc);
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yield return op2;
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if (!op2.IsError)
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{
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OnSetRemoteSuccess(otherPc);
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StartCoroutine(CheckActualCodec());
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}
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else
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{
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var error = op2.Error;
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OnSetSessionDescriptionError(ref error);
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}
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}
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// Display the video codec that is actually used.
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IEnumerator CheckActualCodec()
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{
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yield return new WaitForSeconds(1f);
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if (_pc1 == null)
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yield break;
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var op = _pc1.GetStats();
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yield return op;
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if (op.IsError)
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{
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Debug.LogErrorFormat("RTCPeerConnection.GetStats failed: {0}", op.Error);
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yield break;
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}
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RTCStatsReport report = op.Value;
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List<RTCOutboundRTPStreamStats> outBoundStatsList = report.Stats.Values.Where(
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stats => stats.Type == RTCStatsType.OutboundRtp).Cast<RTCOutboundRTPStreamStats>().ToList();
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if (!outBoundStatsList.Any())
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{
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Debug.LogWarning($"{nameof(RTCStatsReport)} don't contain any {nameof(RTCOutboundRTPStreamStats)}");
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yield break;
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}
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RTCOutboundRTPStreamStats outBoundStats = outBoundStatsList.FirstOrDefault(stats => stats.kind == "video");
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if (outBoundStats == null)
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{
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Debug.LogWarning($"{nameof(RTCOutboundRTPStreamStats)} with kind video is not included in {nameof(outBoundStatsList)}.");
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yield break;
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}
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string codecId = outBoundStats.codecId;
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List<RTCCodecStats> codecStatsList = report.Stats.Values.Where(
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stats => stats.Type == RTCStatsType.Codec).Cast<RTCCodecStats>().ToList();
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if (!codecStatsList.Any())
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{
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Debug.LogWarning($"{nameof(RTCOutboundRTPStreamStats)} don't contain any {nameof(RTCCodecStats)}");
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yield break;
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}
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RTCCodecStats codecStats =
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codecStatsList.FirstOrDefault(stats => stats.Id == codecId);
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if (codecStats == null)
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{
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Debug.LogWarning($"{nameof(RTCCodecStats)} with codecId {codecId} is not included in {nameof(codecStatsList)}.");
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yield break;
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}
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actualCodecText.text = string.Format("Using {0} {1}, payloadType={2}.",
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codecStats.mimeType,
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codecStats.sdpFmtpLine,
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codecStats.payloadType
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);
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}
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private static void OnCreateSessionDescriptionError(RTCError error)
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{
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Debug.LogError($"Error Detail Type: {error.message}");
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}
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}
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