Adding OrtcFactory, and changing UdpTransport to match current plan.

webrtc/api/udptransportinterface.h

+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_API_UDPTRANSPORTINTERFACE_H_
+#define WEBRTC_API_UDPTRANSPORTINTERFACE_H_
+
+#include "webrtc/api/proxy.h"
+#include "webrtc/base/socketaddress.h"
+
+namespace webrtc {
+
+// Interface for a raw UDP transport (not using ICE), meaning a combination of
+// a local/remote IP address/port.
+//
+// An instance can be instantiated using OrtcFactory.
+//
+// Each instance reserves a UDP port, which will be freed when the
+// UdpTransportInterface destructor is called.
+//
+// Calling SetRemoteAddress sets the destination of outgoing packets; without a
+// destination, packets can't be sent, but they can be received.
+class UdpTransportInterface {
+ public:
+  virtual ~UdpTransportInterface() {}
+
+  // Get the address of the socket allocated for this transport.
+  virtual rtc::SocketAddress GetLocalAddress() const = 0;
+
+  // Sets the address to which packets will be delivered.
+  //
+  // Calling with a "nil" (default-constructed) address is legal, and unsets
+  // any previously set destination.
+  //
+  // However, calling with an incomplete address (port or IP not set) will
+  // fail.
+  virtual bool SetRemoteAddress(const rtc::SocketAddress& dest) = 0;
+  // Simple getter. If never set, returns nil address.
+  virtual rtc::SocketAddress GetRemoteAddress() const = 0;
+};
+
+BEGIN_OWNED_PROXY_MAP(UdpTransport)
+  PROXY_WORKER_THREAD_DESTRUCTOR()
+  PROXY_WORKER_CONSTMETHOD0(rtc::SocketAddress, GetLocalAddress)
+  PROXY_WORKER_METHOD1(bool, SetRemoteAddress, const rtc::SocketAddress&)
+  PROXY_WORKER_CONSTMETHOD0(rtc::SocketAddress, GetRemoteAddress)
+END_PROXY_MAP()
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_UDPTRANSPORTINTERFACE_H_