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This directory contains an example Unity native plugin for Windows OS and Android.
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.
For detailed build instruction on Android, see ANDROID_INSTRUCTION
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 {
// 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 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(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(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(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();
}
public void ClosePeerConnection() {
ClosePeerConnection(mPeerConnectionId);
mPeerConnectionId = -1;
}
// Return -1 if Peerconnection is not available.
public int GetUniqueId() {
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(mPeerConnectionId);
}
private void RaiseDataFromDataChannelReady(string data) {
if (OnDataFromDataChannelReady != null)
OnDataFromDataChannelReady(mPeerConnectionId, data);
}
private void RaiseFailureMessage(string msg) {
if (OnFailureMessage != null)
OnFailureMessage(mPeerConnectionId, msg);
}
private void RaiseAudioBusReady(IntPtr data, int bitsPerSample,
int sampleRate, int numberOfChannels, int numberOfFrames) {
if (OnAudioBusReady != null)
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(mPeerConnectionId, type, sdp);
}
private void RaiseIceCandiateReadytoSend(string candidate, int sdpMlineIndex, string sdpMid) {
if (OnIceCandiateReadytoSend != 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;
public event DataFromDataChannelReadyDelegate OnDataFromDataChannelReady;
private FailureMessageInternalDelegate failureMessageDelegate = null;
public event FailureMessageDelegate OnFailureMessage;
private AudioBusReadyInternalDelegate audioBusReadyDelegate = null;
public event AudioBusReadyDelegate OnAudioBusReady;
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;
public event IceCandiateReadytoSendDelegate OnIceCandiateReadytoSend;
private int mPeerConnectionId = -1;
}
}