Update native plugin dll for turn servers and video.

webrtc/examples/unityplugin/README

 This directory contains an example Unity native plugin for Windows OS.
 The APIs use Platform Invoke (P/Invoke) technology as required by Unity native plugin.
 This plugin dll can also be used by Windows C# applications other than Unity.
 
 An example of wrapping native plugin into a C# managed class in Unity is given as following:
 
 using System;
+using System.Collections.Generic;
 using System.Runtime.InteropServices;
 
 namespace SimplePeerConnectionM {
-  // This is a managed wrap up class for the native c style peer connection APIs.
+  // A class for ice candidate.
+  public class IceCandidate {
+    public IceCandidate(string candidate, int sdpMlineIndex, string sdpMid) {
+      mCandidate = candidate;
+      mSdpMlineIndex = sdpMlineIndex;
+      mSdpMid = sdpMid;
+    }
+    string mCandidate;
+    int mSdpMlineIndex;
+    string mSdpMid;
+
+    public string Candidate {
+      get { return mCandidate; }
+      set { mCandidate = value; }
+    }
+
+    public int SdpMlineIndex {
+      get { return mSdpMlineIndex; }
+      set { mSdpMlineIndex = value; }
+    }
+
+    public string SdpMid {
+      get { return mSdpMid; }
+      set { mSdpMid = value; }
+    }
+  }
+
+  // A managed wrapper up class for the native c style peer connection APIs.
   public class PeerConnectionM {
-    //private const string dll_path = "SimplePeerConnection";
-    private const string dll_path = "webrtc_unity_plugin";
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern int CreatePeerConnection();
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool ClosePeerConnection(int peer_connection_id);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool AddStream(int peer_connection_id, bool audio_only);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool AddDataChannel(int peer_connection_id);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool CreateOffer(int peer_connection_id);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool CreateAnswer(int peer_connection_id);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool SendDataViaDataChannel(int peer_connection_id, string data);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool SetAudioControl(int peer_connection_id, bool is_mute, bool is_record);
+    private const string dllPath = "webrtc_unity_plugin";
+
+    //create a peerconnection with turn servers
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern int CreatePeerConnection(string[] turnUrls, int noOfUrls,
+        string username, string credential);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool ClosePeerConnection(int peerConnectionId);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool AddStream(int peerConnectionId, bool audioOnly);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool AddDataChannel(int peerConnectionId);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool CreateOffer(int peerConnectionId);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool CreateAnswer(int peerConnectionId);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool SendDataViaDataChannel(int peerConnectionId, string data);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool SetAudioControl(int peerConnectionId, bool isMute, bool isRecord);
 
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
     private delegate void LocalDataChannelReadyInternalDelegate();
     public delegate void LocalDataChannelReadyDelegate(int id);
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool RegisterOnLocalDataChannelReady(int peer_connection_id, LocalDataChannelReadyInternalDelegate callback);
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnLocalDataChannelReady(
+        int peerConnectionId, LocalDataChannelReadyInternalDelegate callback);
 
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
     private delegate void DataFromDataChannelReadyInternalDelegate(string s);
     public delegate void DataFromDataChannelReadyDelegate(int id, string s);
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool RegisterOnDataFromDataChannelReady(int peer_connection_id, DataFromDataChannelReadyInternalDelegate callback);
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnDataFromDataChannelReady(
+        int peerConnectionId, DataFromDataChannelReadyInternalDelegate callback);
 
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
     private delegate void FailureMessageInternalDelegate(string msg);
     public delegate void FailureMessageDelegate(int id, string msg);
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool RegisterOnFailure(int peer_connection_id, FailureMessageInternalDelegate callback);
-
-    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
-    private delegate void AudioBusReadyInternalDelegate(IntPtr data, int bits_per_sample,
-        int sample_rate, int number_of_channels, int number_of_frames);
-    public delegate void AudioBusReadyDelegate(int id, IntPtr data, int bits_per_sample,
-        int sample_rate, int number_of_channels, int number_of_frames);
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool RegisterOnAudioBusReady(int peer_connection_id, AudioBusReadyInternalDelegate callback);
-
-    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
-    private delegate void LocalSdpReadytoSendInternalDelegate(string s);
-    public delegate void LocalSdpReadytoSendDelegate(int id, string s);
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool RegisterOnLocalSdpReadytoSend(int peer_connection_id, LocalSdpReadytoSendInternalDelegate callback);
-
-    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
-    private delegate void IceCandiateReadytoSendInternalDelegate(string s);
-    public delegate void IceCandiateReadytoSendDelegate(int id, string s);
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool RegisterOnIceCandiateReadytoSend(int peer_connection_id, IceCandiateReadytoSendInternalDelegate callback);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern int ReceivedSdp(int peer_connection_id, string sdp);
-
-    [DllImport(dll_path, CallingConvention = CallingConvention.Cdecl)]
-    private static extern bool ReceivedIceCandidate(int peer_connection_id, string ice_candidate);
-
-    public void CreatePeerConnectionM() {
-      peer_connection_id_ = CreatePeerConnection();
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnFailure(int peerConnectionId,
+        FailureMessageInternalDelegate callback);
+
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+    private delegate void AudioBusReadyInternalDelegate(IntPtr data, int bitsPerSample,
+        int sampleRate, int numberOfChannels, int numberOfFrames);
+    public delegate void AudioBusReadyDelegate(int id, IntPtr data, int bitsPerSample,
+        int sampleRate, int numberOfChannels, int numberOfFrames);
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnAudioBusReady(int peerConnectionId,
+        AudioBusReadyInternalDelegate callback);
+
+    // Video callbacks.
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+    private delegate void I420FrameReadyInternalDelegate(
+        IntPtr dataY, IntPtr dataU, IntPtr dataV,
+        int strideY, int strideU, int strideV,
+        uint width, uint height);
+    public delegate void I420FrameReadyDelegate(int id,
+        IntPtr dataY, IntPtr dataU, IntPtr dataV,
+        int strideY, int strideU, int strideV,
+        uint width, uint height);
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnLocalI420FrameReady(int peerConnectionId,
+        I420FrameReadyInternalDelegate callback);
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnRemoteI420FrameReady(int peerConnectionId,
+        I420FrameReadyInternalDelegate callback);
+
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+    private delegate void LocalSdpReadytoSendInternalDelegate(string type, string sdp);
+    public delegate void LocalSdpReadytoSendDelegate(int id, string type, string sdp);
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnLocalSdpReadytoSend(int peerConnectionId,
+        LocalSdpReadytoSendInternalDelegate callback);
+
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+    private delegate void IceCandiateReadytoSendInternalDelegate(
+        string candidate, int sdpMlineIndex, string sdpMid);
+    public delegate void IceCandiateReadytoSendDelegate(
+        int id, string candidate, int sdpMlineIndex, string sdpMid);
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool RegisterOnIceCandiateReadytoSend(
+        int peerConnectionId, IceCandiateReadytoSendInternalDelegate callback);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool SetRemoteDescription(int peerConnectionId, string type, string sdp);
+
+    [DllImport(dllPath, CallingConvention = CallingConvention.Cdecl)]
+    private static extern bool AddIceCandidate(int peerConnectionId, string sdp,
+      int sdpMlineindex, string sdpMid);
+
+    public PeerConnectionM(List<string> turnUrls, string username, string credential) {
+      string[] urls = turnUrls != null ? turnUrls.ToArray() : null;
+      int length = turnUrls != null ? turnUrls.Count : 0;
+      mPeerConnectionId = CreatePeerConnection(urls, length, username, credential);
       RegisterCallbacks();
     }
 
-    private void RegisterCallbacks() {
-      localDataChannelReadyDelegate_ = new LocalDataChannelReadyInternalDelegate(RaiseLocalDataChannelReady);
-      RegisterOnLocalDataChannelReady(peer_connection_id_, localDataChannelReadyDelegate_);
-
-      dataFromDataChannelReadyDelegate_ = new DataFromDataChannelReadyInternalDelegate(RaiseDataFromDataChannelReady);
-      RegisterOnDataFromDataChannelReady(peer_connection_id_, dataFromDataChannelReadyDelegate_);
-
-      failureMessageDelegate_ = new FailureMessageInternalDelegate(RaiseFailureMessage);
-      RegisterOnFailure(peer_connection_id_, failureMessageDelegate_);
-
-      audioBusReadyDelegate_ = new AudioBusReadyInternalDelegate(RaiseAudioBusReady);
-      RegisterOnAudioBusReady(peer_connection_id_, audioBusReadyDelegate_);
-
-      localSdpReadytoSendDelegate_ = new LocalSdpReadytoSendInternalDelegate(RaiseLocalSdpReadytoSend);
-      RegisterOnLocalSdpReadytoSend(peer_connection_id_, localSdpReadytoSendDelegate_);
-
-      iceCandiateReadytoSendDelegate_ = new IceCandiateReadytoSendInternalDelegate(RaiseIceCandiateReadytoSend);
-      RegisterOnIceCandiateReadytoSend(peer_connection_id_, iceCandiateReadytoSendDelegate_);
-    }
-
-    public void ClosePeerConnectionM() {
-      ClosePeerConnection(peer_connection_id_);
-      peer_connection_id_ = -1;
+    public void ClosePeerConnection() {
+      ClosePeerConnection(mPeerConnectionId);
+      mPeerConnectionId = -1;
     }
 
     // Return -1 if Peerconnection is not available.
     public int GetUniqueId() {
-      return peer_connection_id_;
-    }
-
-    public void AddStreamM(bool audio_only) {
-      AddStream(peer_connection_id_, audio_only);
-    }
-
-    public void AddDataChannelM() {
-      AddDataChannel(peer_connection_id_);
-    }
-
-    public void CreateOfferM() {
-      CreateOffer(peer_connection_id_);
-    }
-
-    public void CreateAnswerM() {
-      CreateAnswer(peer_connection_id_);
-    }
-
-    public void SendDataViaDataChannelM(string data) {
-      SendDataViaDataChannel(peer_connection_id_, data);
-    }
-
-    public void SetAudioControl(bool is_mute, bool is_record) {
-      SetAudioControl(peer_connection_id_, is_mute, is_record);
-    }
-
-    public void ReceivedSdpM(string sdp) {
-      peer_connection_id_ = ReceivedSdp(peer_connection_id_, sdp);
-      RegisterCallbacks();
-    }
-
-    public void ReceivedIceCandidateM(string ice_candidate) {
-      ReceivedIceCandidate(peer_connection_id_, ice_candidate);
+      return mPeerConnectionId;
+    }
+
+    public void AddStream(bool audioOnly) {
+      AddStream(mPeerConnectionId, audioOnly);
+    }
+
+    public void AddDataChannel() {
+      AddDataChannel(mPeerConnectionId);
+    }
+
+    public void CreateOffer() {
+      CreateOffer(mPeerConnectionId);
+    }
+
+    public void CreateAnswer() {
+      CreateAnswer(mPeerConnectionId);
+    }
+
+    public void SendDataViaDataChannel(string data) {
+      SendDataViaDataChannel(mPeerConnectionId, data);
+    }
+
+    public void SetAudioControl(bool isMute, bool isRecord) {
+      SetAudioControl(mPeerConnectionId, isMute, isRecord);
+    }
+
+    public void SetRemoteDescription(string type, string sdp) {
+      SetRemoteDescription(mPeerConnectionId, type, sdp);
+    }
+
+    public void AddIceCandidate(string candidate, int sdpMlineindex, string sdpMid) {
+      AddIceCandidate(mPeerConnectionId, candidate, sdpMlineindex, sdpMid);
+    }
+
+    private void RegisterCallbacks() {
+      localDataChannelReadyDelegate = new LocalDataChannelReadyInternalDelegate(
+          RaiseLocalDataChannelReady);
+      RegisterOnLocalDataChannelReady(mPeerConnectionId, localDataChannelReadyDelegate);
+
+      dataFromDataChannelReadyDelegate = new DataFromDataChannelReadyInternalDelegate(
+          RaiseDataFromDataChannelReady);
+      RegisterOnDataFromDataChannelReady(mPeerConnectionId, dataFromDataChannelReadyDelegate);
+
+      failureMessageDelegate = new FailureMessageInternalDelegate(RaiseFailureMessage);
+      RegisterOnFailure(mPeerConnectionId, failureMessageDelegate);
+
+      audioBusReadyDelegate = new AudioBusReadyInternalDelegate(RaiseAudioBusReady);
+      RegisterOnAudioBusReady(mPeerConnectionId, audioBusReadyDelegate);
+
+      localI420FrameReadyDelegate = new I420FrameReadyInternalDelegate(
+        RaiseLocalVideoFrameReady);
+      RegisterOnLocalI420FrameReady(mPeerConnectionId, localI420FrameReadyDelegate);
+
+      remoteI420FrameReadyDelegate = new I420FrameReadyInternalDelegate(
+        RaiseRemoteVideoFrameReady);
+      RegisterOnRemoteI420FrameReady(mPeerConnectionId, remoteI420FrameReadyDelegate);
+
+      localSdpReadytoSendDelegate = new LocalSdpReadytoSendInternalDelegate(
+        RaiseLocalSdpReadytoSend);
+      RegisterOnLocalSdpReadytoSend(mPeerConnectionId, localSdpReadytoSendDelegate);
+
+      iceCandiateReadytoSendDelegate =
+          new IceCandiateReadytoSendInternalDelegate(RaiseIceCandiateReadytoSend);
+      RegisterOnIceCandiateReadytoSend(
+          mPeerConnectionId, iceCandiateReadytoSendDelegate);
     }
 
     private void RaiseLocalDataChannelReady() {
       if (OnLocalDataChannelReady != null)
-        OnLocalDataChannelReady(peer_connection_id_);
+        OnLocalDataChannelReady(mPeerConnectionId);
     }
 
     private void RaiseDataFromDataChannelReady(string data) {
       if (OnDataFromDataChannelReady != null)
-        OnDataFromDataChannelReady(peer_connection_id_, data);
+        OnDataFromDataChannelReady(mPeerConnectionId, data);
     }
 
     private void RaiseFailureMessage(string msg) {
       if (OnFailureMessage != null)
-        OnFailureMessage(peer_connection_id_, msg);
-    }
-
-    private void RaiseAudioBusReady(IntPtr data, int bits_per_sample,
-      int sample_rate, int number_of_channels, int number_of_frames) {
+        OnFailureMessage(mPeerConnectionId, msg);
+    }
+
+    private void RaiseAudioBusReady(IntPtr data, int bitsPerSample,
+      int sampleRate, int numberOfChannels, int numberOfFrames) {
       if (OnAudioBusReady != null)
-        OnAudioBusReady(peer_connection_id_, data, bits_per_sample, sample_rate,
-            number_of_channels, number_of_frames);
-    }
-
-    private void RaiseLocalSdpReadytoSend(string msg) {
+        OnAudioBusReady(mPeerConnectionId, data, bitsPerSample, sampleRate,
+            numberOfChannels, numberOfFrames);
+    }
+
+    private void RaiseLocalVideoFrameReady(
+        IntPtr dataY, IntPtr dataU, IntPtr dataV,
+        int strideY, int strideU, int strideV,
+        uint width, uint height) {
+      if (OnLocalVideoFrameReady != null)
+        OnLocalVideoFrameReady(mPeerConnectionId, dataY, dataU, dataV, strideY, strideU, strideV,
+          width, height);
+    }
+
+    private void RaiseRemoteVideoFrameReady(
+       IntPtr dataY, IntPtr dataU, IntPtr dataV,
+       int strideY, int strideU, int strideV,
+       uint width, uint height) {
+      if (OnRemoteVideoFrameReady != null)
+        OnRemoteVideoFrameReady(mPeerConnectionId, dataY, dataU, dataV, strideY, strideU, strideV,
+          width, height);
+    }
+
+
+    private void RaiseLocalSdpReadytoSend(string type, string sdp) {
       if (OnLocalSdpReadytoSend != null)
-        OnLocalSdpReadytoSend(peer_connection_id_, msg);
-    }
-
-    private void RaiseIceCandiateReadytoSend(string msg) {
+        OnLocalSdpReadytoSend(mPeerConnectionId, type, sdp);
+    }
+
+    private void RaiseIceCandiateReadytoSend(string candidate, int sdpMlineIndex, string sdpMid) {
       if (OnIceCandiateReadytoSend != null)
-        OnIceCandiateReadytoSend(peer_connection_id_, msg);
-    }
-
-    private LocalDataChannelReadyInternalDelegate localDataChannelReadyDelegate_ = null;
+        OnIceCandiateReadytoSend(mPeerConnectionId, candidate, sdpMlineIndex, sdpMid);
+    }
+
+    public void AddQueuedIceCandidate(List<IceCandidate> iceCandidateQueue) {
+      if (iceCandidateQueue != null) {
+        foreach (IceCandidate ic in iceCandidateQueue) {
+          AddIceCandidate(mPeerConnectionId, ic.Candidate, ic.SdpMlineIndex, ic.SdpMid);
+        }
+      }
+    }
+
+    private LocalDataChannelReadyInternalDelegate localDataChannelReadyDelegate = null;
     public event LocalDataChannelReadyDelegate OnLocalDataChannelReady;
 
-    private DataFromDataChannelReadyInternalDelegate dataFromDataChannelReadyDelegate_ = null;
+    private DataFromDataChannelReadyInternalDelegate dataFromDataChannelReadyDelegate = null;
     public event DataFromDataChannelReadyDelegate OnDataFromDataChannelReady;
 
-    private FailureMessageInternalDelegate failureMessageDelegate_ = null;
+    private FailureMessageInternalDelegate failureMessageDelegate = null;
     public event FailureMessageDelegate OnFailureMessage;
 
-    private AudioBusReadyInternalDelegate audioBusReadyDelegate_ = null;
+    private AudioBusReadyInternalDelegate audioBusReadyDelegate = null;
     public event AudioBusReadyDelegate OnAudioBusReady;
 
-    private LocalSdpReadytoSendInternalDelegate localSdpReadytoSendDelegate_ = null;
+    private I420FrameReadyInternalDelegate localI420FrameReadyDelegate = null;
+    public event I420FrameReadyDelegate OnLocalVideoFrameReady;
+
+    private I420FrameReadyInternalDelegate remoteI420FrameReadyDelegate = null;
+    public event I420FrameReadyDelegate OnRemoteVideoFrameReady;
+
+    private LocalSdpReadytoSendInternalDelegate localSdpReadytoSendDelegate = null;
     public event LocalSdpReadytoSendDelegate OnLocalSdpReadytoSend;
 
-    private IceCandiateReadytoSendInternalDelegate iceCandiateReadytoSendDelegate_ = null;
+    private IceCandiateReadytoSendInternalDelegate iceCandiateReadytoSendDelegate = null;
     public event IceCandiateReadytoSendDelegate OnIceCandiateReadytoSend;
 
-    private int peer_connection_id_ = -1;
+    private int mPeerConnectionId = -1;
   }
 }