Create the SrtpTransportInterface.

webrtc/ortc/rtptransportadapter.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_ORTC_RTPTRANSPORTADAPTER_H_
+#define WEBRTC_ORTC_RTPTRANSPORTADAPTER_H_
+
+#include <memory>
+#include <vector>
+
+#include "webrtc/api/ortc/srtptransportinterface.h"
+#include "webrtc/api/rtcerror.h"
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/sigslot.h"
+#include "webrtc/media/base/streamparams.h"
+#include "webrtc/ortc/rtptransportcontrolleradapter.h"
+#include "webrtc/pc/channel.h"
+
+namespace webrtc {
+
+// Implementation of RtpTransportInterface to be used with RtpSenderAdapter,

[Taylor Brandstetter, 2017/02/24 18:57:58]

This comment should be updated. It should also mention that this class is used
to implement both a secure and insecure RTP transport.

[Zhi Huang, 2017/02/27 05:16:00]

Done.

+// RtpReceiverAdapter, and RtpTransportControllerAdapter classes.
+//
+// TODO(deadbeef): When BaseChannel is split apart into separate
+// "RtpTransport"/"RtpTransceiver"/"RtpSender"/"RtpReceiver" objects, this
+// adapter object can be removed.
+class RtpTransportAdapter : public SrtpTransportInterface {
+ public:
+  // |rtp| can't be null. |rtcp| can if RTCP muxing is used immediately (meaning
+  // |rtcp_parameters.mux| is also true).
+  static RTCErrorOr<std::unique_ptr<RtpTransportInterface>> CreateProxied(
+      const RtcpParameters& rtcp_parameters,
+      PacketTransportInterface* rtp,
+      PacketTransportInterface* rtcp,
+      RtpTransportControllerAdapter* rtp_transport_controller);
+
+  static RTCErrorOr<std::unique_ptr<SrtpTransportInterface>> CreateSrtpProxied(
+      const RtcpParameters& rtcp_parameters,
+      PacketTransportInterface* rtp,
+      PacketTransportInterface* rtcp,
+      RtpTransportControllerAdapter* rtp_transport_controller);
+
+  ~RtpTransportAdapter() override;
+
+  // RtpTransportInterface implementation.
+  PacketTransportInterface* GetRtpPacketTransport() const override;
+  PacketTransportInterface* GetRtcpPacketTransport() const override;
+  RTCError SetRtcpParameters(const RtcpParameters& parameters) override;
+  RtcpParameters GetRtcpParameters() const override { return rtcp_parameters_; }
+
+  // SRTP specific implementation.
+  RTCError SetSrtpSendKey(const cricket::CryptoParams& params) override;
+  RTCError SetSrtpReceiveKey(const cricket::CryptoParams& params) override;
+
+  // Methods used internally by OrtcFactory.
+  RtpTransportControllerAdapter* rtp_transport_controller() {
+    return rtp_transport_controller_;
+  }
+  void TakeOwnershipOfRtpTransportController(
+      std::unique_ptr<RtpTransportControllerInterface> controller);
+
+  // Methods used internally by OrtcAudio/VideoSender.
+  bool TransportReadyToSendAndReceive();
+
+  // Used by RtpTransportControllerAdapter to tell when it should stop
+  // returning this transport from GetTransports().
+  sigslot::signal1<RtpTransportAdapter*> SignalDestroyed;
+
+ protected:
+  RtpTransportAdapter* GetInternal() override { return this; }
+
+ private:
+  RtpTransportAdapter(const RtcpParameters& rtcp_parameters,
+                      PacketTransportInterface* rtp,
+                      PacketTransportInterface* rtcp,
+                      RtpTransportControllerAdapter* rtp_transport_controller,
+                      bool is_srtp_transport);
+
+  PacketTransportInterface* rtp_packet_transport_;
+  PacketTransportInterface* rtcp_packet_transport_;
+  RtpTransportControllerAdapter* rtp_transport_controller_;
+  // Non-null if this class owns the transport controller.
+  std::unique_ptr<RtpTransportControllerInterface>
+      owned_rtp_transport_controller_;
+  RtcpParameters rtcp_parameters_;
+
+  bool is_srtp_transport_;
+  bool have_send_key_;
+  bool have_receive_key_;
+
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RtpTransportAdapter);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_ORTC_RTPTRANSPORTADAPTER_H_