/// <summary>
/// Get a snapshot of all transceivers associated with this PeerConnection.
/// This PeerConnection owns the returned transceivers.
/// </summary>
/// <remarks>This method is thread safe</remarks>
/// <returns></returns>
public IReadOnlyList <RtpTransceiver> GetTransceivers()
{
SafetyCheck();
PeerConnectionInterop.GetTransceivers(_handle,
out var nativeTransceiverArray,
out var nativeTransceiverArraySize);
// When there is no transceivers,
// The unmanaged code returns size = 0 and nativeTransceiverArray will be IntPtr.Zero,
// therefore we ignore that.
if (nativeTransceiverArraySize > 0)
{
try
{
for (var i = 0; i < nativeTransceiverArraySize; i++)
{
var nativeTransceiverIntPtr = Marshal.ReadIntPtr(nativeTransceiverArray, i * IntPtr.Size);
if (false == _knownTransceivers.ContainsKey(nativeTransceiverIntPtr))
{
_knownTransceivers[nativeTransceiverIntPtr] = new RtpTransceiver(
nativeTransceiverIntPtr,
_signallingThread);
}
}
}
finally
{
PeerConnectionInterop.FreeGetTransceiversResult(_handle, nativeTransceiverArray);
}
}
// Return transceivers as a copy
return(_knownTransceivers.Values.ToList());
}
public RtpTransceiver AddTransceiver(MediaKind kind, RtpTransceiverDirection direction)
{
SafetyCheck();
if (kind == MediaKind.Data)
{
throw new NotSupportedException();
}
var transceiverPtr = PeerConnectionInterop.AddTransceiver(_handle, kind == MediaKind.Audio, direction);
if (transceiverPtr == IntPtr.Zero)
{
throw new AddTransceiverFailedException();
}
var tmp = new RtpTransceiver(transceiverPtr, _signallingThread);
_knownTransceivers.Add(transceiverPtr, tmp);
return(tmp);
}