Adding "adapter" ORTC objects on top of ChannelManager/BaseChannel/etc.

webrtc/ortc/rtptransportadapter.cc

+/*
+ *  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.
+ */
+
+#include "webrtc/ortc/rtptransportadapter.h"
+
+#include <algorithm>  // For std::find.
+#include <set>
+#include <sstream>
+#include <utility>  // For std::move.
+
+#include "webrtc/api/proxy.h"
+#include "webrtc/base/helpers.h"
+#include "webrtc/base/logging.h"
+
+namespace {
+
+static const int kDefaultRtcpCnameLength = 16;
+
+}  // namespace
+
+namespace webrtc {
+
+BEGIN_OWNED_PROXY_MAP(RtpTransport)
+PROXY_SIGNALING_THREAD_DESTRUCTOR()
+PROXY_CONSTMETHOD0(PacketTransportInterface*, GetRtpPacketTransport)
+PROXY_CONSTMETHOD0(PacketTransportInterface*, GetRtcpPacketTransport)
+PROXY_METHOD1(RTCError, SetRtcpParameters, const RtcpParameters&)
+PROXY_CONSTMETHOD0(RtcpParameters, GetRtcpParameters)
+protected:
+RtpTransportAdapter* GetInternal() override {
+  return internal();
+}
+END_PROXY_MAP()
+
+// static
+RTCErrorOr<std::unique_ptr<RtpTransportInterface>>
+RtpTransportAdapter::CreateProxied(
+    const RtcpParameters& rtcp_parameters,
+    PacketTransportInterface* rtp,
+    PacketTransportInterface* rtcp,
+    RtpTransportControllerInterface* rtp_transport_controller) {
+  if (!rtp) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Must provide an RTP packet transport.");
+  }
+  if (!rtcp_parameters.mux && !rtcp) {
+    LOG_AND_RETURN_ERROR(
+        RTCErrorType::INVALID_PARAMETER,
+        "Must provide an RTCP packet transport when RTCP muxing is not used.");
+  }
+  if (rtcp_parameters.mux && rtcp) {
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Creating an RtpTransport with RTCP muxing enabled, "
+                         "with a separate RTCP packet transport?");
+  }
+  if (!rtp_transport_controller) {
+    // Since OrtcFactory::CreateRtpTransport creates an RtpTransportController
+    // automatically when one isn't passed in, this should never be reached.
+    RTC_NOTREACHED();
+    LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
+                         "Must provide an RTP transport controller.");
+  }
+  RtpTransportControllerAdapter* internal_controller =
+      rtp_transport_controller->GetInternal();
+  auto proxy = RtpTransportProxyWithInternal<RtpTransportAdapter>::Create(
+      internal_controller->signaling_thread(),
+      internal_controller->worker_thread(),
+      new RtpTransportAdapter(rtcp_parameters, rtp, rtcp, internal_controller));
+  internal_controller->AddTransport(proxy.get());
+  return std::move(proxy);
+}
+
+RTCErrorOr<std::unique_ptr<RtpTransportInterface>>
+RtpTransportAdapter::CreateProxied(
+    const RtcpParameters& rtcp_parameters,
+    PacketTransportInterface* rtp,
+    PacketTransportInterface* rtcp,
+    std::unique_ptr<RtpTransportControllerInterface> rtp_transport_controller) {
+  auto result =
+      CreateProxied(rtcp_parameters, rtp, rtcp, rtp_transport_controller.get());
+  // If RtpTransport was successfully created, transfer ownership of
+  // |rtp_transport_controller|. Otherwise it will go out of scope and be
+  // deleted automatically.
+  if (result.ok()) {
+    result.value()->GetInternal()->owned_rtp_transport_controller_.reset(
+        rtp_transport_controller.release());
+  }
+  return result;
+}
+
+RtpTransportAdapter::~RtpTransportAdapter() {
+  rtp_transport_controller_->RemoveTransport(this);
+}
+
+PacketTransportInterface* RtpTransportAdapter::GetRtpPacketTransport() const {
+  return rtp_packet_transport_;
+}
+
+PacketTransportInterface* RtpTransportAdapter::GetRtcpPacketTransport() const {
+  return rtcp_packet_transport_;
+}
+
+RTCError RtpTransportAdapter::SetRtcpParameters(
+    const RtcpParameters& parameters) {
+  if (!parameters.mux && rtcp_parameters_.mux) {
+    LOG_AND_RETURN_ERROR(webrtc::RTCErrorType::INVALID_STATE,
+                         "Can't disable RTCP muxing after enabling.");
+  }
+  if (!parameters.cname.empty() && parameters.cname != rtcp_parameters_.cname) {
+    LOG_AND_RETURN_ERROR(webrtc::RTCErrorType::UNSUPPORTED_OPERATION,
+                         "Changing the RTCP CNAME is currently unsupported.");
+  }
+  // If the CNAME is empty, use the existing one.
+  RtcpParameters copy = parameters;
+  if (copy.cname.empty()) {
+    copy.cname = rtcp_parameters_.cname;
+  }
+  RTCError err = rtp_transport_controller_->SetRtcpParameters(copy, this);
+  if (!err.ok()) {
+    return err;
+  }
+  rtcp_parameters_ = copy;
+  if (rtcp_parameters_.mux) {
+    rtcp_packet_transport_ = nullptr;
+  }
+  return RTCError::OK();
+}
+
+RtpTransportAdapter::RtpTransportAdapter(
+    const RtcpParameters& rtcp_parameters,
+    PacketTransportInterface* rtp,
+    PacketTransportInterface* rtcp,
+    RtpTransportControllerAdapter* rtp_transport_controller)
+    : rtp_packet_transport_(rtp),
+      rtcp_packet_transport_(rtcp),
+      rtp_transport_controller_(rtp_transport_controller),
+      rtcp_parameters_(rtcp_parameters) {
+  RTC_DCHECK(rtp_transport_controller);
+  if (rtcp_parameters_.cname.empty()) {
+    if (!rtc::CreateRandomString(kDefaultRtcpCnameLength,
+                                 &rtcp_parameters_.cname)) {
+      LOG(LS_ERROR) << "Failed to generate CNAME.";
+      RTC_NOTREACHED();
+    }
+  }
+}
+
+}  // namespace webrtc