Repo created

TMessagesProj/jni/voip/webrtc/pc/connection_context.h

@@ -0,0 +1,152 @@
+/*
+ *  Copyright 2020 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 PC_CONNECTION_CONTEXT_H_
+#define PC_CONNECTION_CONTEXT_H_
+
+#include <memory>
+#include <string>
+
+#include "api/environment/environment.h"
+#include "api/media_stream_interface.h"
+#include "api/peer_connection_interface.h"
+#include "api/ref_counted_base.h"
+#include "api/scoped_refptr.h"
+#include "api/sequence_checker.h"
+#include "api/transport/sctp_transport_factory_interface.h"
+#include "media/base/media_engine.h"
+#include "p2p/base/basic_packet_socket_factory.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/network.h"
+#include "rtc_base/network_monitor_factory.h"
+#include "rtc_base/rtc_certificate_generator.h"
+#include "rtc_base/socket_factory.h"
+#include "rtc_base/thread.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace rtc {
+class BasicPacketSocketFactory;
+class UniqueRandomIdGenerator;
+}  // namespace rtc
+
+namespace webrtc {
+
+// This class contains resources needed by PeerConnection and associated
+// objects. A reference to this object is passed to each PeerConnection. The
+// methods on this object are assumed not to change the state in any way that
+// interferes with the operation of other PeerConnections.
+//
+// This class must be created and destroyed on the signaling thread.
+class ConnectionContext final
+    : public rtc::RefCountedNonVirtual<ConnectionContext> {
+ public:
+  // Creates a ConnectionContext. May return null if initialization fails.
+  // The Dependencies class allows simple management of all new dependencies
+  // being added to the ConnectionContext.
+  static rtc::scoped_refptr<ConnectionContext> Create(
+      const Environment& env,
+      PeerConnectionFactoryDependencies* dependencies);
+
+  // This class is not copyable or movable.
+  ConnectionContext(const ConnectionContext&) = delete;
+  ConnectionContext& operator=(const ConnectionContext&) = delete;
+
+  // Functions called from PeerConnection and friends
+  SctpTransportFactoryInterface* sctp_transport_factory() const {
+    return sctp_factory_.get();
+  }
+
+  cricket::MediaEngineInterface* media_engine() const {
+    return media_engine_.get();
+  }
+
+  rtc::Thread* signaling_thread() { return signaling_thread_; }
+  const rtc::Thread* signaling_thread() const { return signaling_thread_; }
+  rtc::Thread* worker_thread() { return worker_thread_.get(); }
+  const rtc::Thread* worker_thread() const { return worker_thread_.get(); }
+  rtc::Thread* network_thread() { return network_thread_; }
+  const rtc::Thread* network_thread() const { return network_thread_; }
+
+  // Environment associated with the PeerConnectionFactory.
+  // Note: environments are different for different PeerConnections,
+  // but they are not supposed to change after creating the PeerConnection.
+  const Environment& env() const { return env_; }
+
+  // Accessors only used from the PeerConnectionFactory class
+  rtc::NetworkManager* default_network_manager() {
+    RTC_DCHECK_RUN_ON(signaling_thread_);
+    return default_network_manager_.get();
+  }
+  rtc::PacketSocketFactory* default_socket_factory() {
+    RTC_DCHECK_RUN_ON(signaling_thread_);
+    return default_socket_factory_.get();
+  }
+  MediaFactory* call_factory() {
+    RTC_DCHECK_RUN_ON(worker_thread());
+    return call_factory_.get();
+  }
+  rtc::UniqueRandomIdGenerator* ssrc_generator() { return &ssrc_generator_; }
+  // Note: There is lots of code that wants to know whether or not we
+  // use RTX, but so far, no code has been found that sets it to false.
+  // Kept in the API in order to ease introduction if we want to resurrect
+  // the functionality.
+  bool use_rtx() { return use_rtx_; }
+
+  // For use by tests.
+  void set_use_rtx(bool use_rtx) { use_rtx_ = use_rtx; }
+
+ protected:
+  ConnectionContext(const Environment& env,
+                    PeerConnectionFactoryDependencies* dependencies);
+
+  friend class rtc::RefCountedNonVirtual<ConnectionContext>;
+  ~ConnectionContext();
+
+ private:
+  // The following three variables are used to communicate between the
+  // constructor and the destructor, and are never exposed externally.
+  bool wraps_current_thread_;
+  std::unique_ptr<rtc::SocketFactory> owned_socket_factory_;
+  std::unique_ptr<rtc::Thread> owned_network_thread_
+      RTC_GUARDED_BY(signaling_thread_);
+  rtc::Thread* const network_thread_;
+  AlwaysValidPointer<rtc::Thread> const worker_thread_;
+  rtc::Thread* const signaling_thread_;
+
+  const Environment env_;
+
+  // This object is const over the lifetime of the ConnectionContext, and is
+  // only altered in the destructor.
+  std::unique_ptr<cricket::MediaEngineInterface> media_engine_;
+
+  // This object should be used to generate any SSRC that is not explicitly
+  // specified by the user (or by the remote party).
+  // TODO(bugs.webrtc.org/12666): This variable is used from both the signaling
+  // and worker threads. See if we can't restrict usage to a single thread.
+  rtc::UniqueRandomIdGenerator ssrc_generator_;
+  std::unique_ptr<rtc::NetworkMonitorFactory> const network_monitor_factory_
+      RTC_GUARDED_BY(signaling_thread_);
+  std::unique_ptr<rtc::NetworkManager> default_network_manager_
+      RTC_GUARDED_BY(signaling_thread_);
+  std::unique_ptr<MediaFactory> const call_factory_
+      RTC_GUARDED_BY(worker_thread());
+
+  std::unique_ptr<rtc::PacketSocketFactory> default_socket_factory_
+      RTC_GUARDED_BY(signaling_thread_);
+  std::unique_ptr<SctpTransportFactoryInterface> const sctp_factory_;
+
+  // Controls whether to announce support for the the rfc4588 payload format
+  // for retransmitted video packets.
+  bool use_rtx_;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_CONNECTION_CONTEXT_H_