1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef REMOTING_HOST_DESKTOP_CAPTURER_PROXY_H_
6 #define REMOTING_HOST_DESKTOP_CAPTURER_PROXY_H_
7 
8 #include <memory>
9 
10 #include "base/callback.h"
11 #include "base/macros.h"
12 #include "base/memory/weak_ptr.h"
13 #include "base/threading/thread_checker.h"
14 #include "remoting/host/desktop_display_info.h"
15 #include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
16 
17 namespace base {
18 class SingleThreadTaskRunner;
19 }  // namespace base
20 
21 namespace webrtc {
22 class DesktopCaptureOptions;
23 }  // namespace webrtc
24 
25 namespace remoting {
26 
27 class ClientSessionControl;
28 
29 // DesktopCapturerProxy is responsible for calling webrtc::DesktopCapturer on
30 // the capturer thread and then returning results to the caller's thread.
31 // GetSourceList() and SelectSource() functions are not implemented by this
32 // class, they always return false.
33 class DesktopCapturerProxy : public webrtc::DesktopCapturer {
34  public:
35   explicit DesktopCapturerProxy(
36       scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
37       base::WeakPtr<ClientSessionControl> client_session_control);
38   ~DesktopCapturerProxy() override;
39 
40   // CreateCapturer() should be used if the capturer needs to be created on the
41   // capturer thread. Alternatively the capturer can be passed to
42   // set_capturer().
43   void CreateCapturer(const webrtc::DesktopCaptureOptions& options);
44   void set_capturer(std::unique_ptr<webrtc::DesktopCapturer> capturer);
45 
46   // webrtc::DesktopCapturer interface.
47   void Start(Callback* callback) override;
48   void SetSharedMemoryFactory(std::unique_ptr<webrtc::SharedMemoryFactory>
49                                   shared_memory_factory) override;
50   void CaptureFrame() override;
51   bool GetSourceList(SourceList* sources) override;
52   bool SelectSource(SourceId id) override;
53 
54  private:
55   class Core;
56 
57   void OnFrameCaptured(webrtc::DesktopCapturer::Result result,
58                        std::unique_ptr<webrtc::DesktopFrame> frame);
59 
60   base::ThreadChecker thread_checker_;
61 
62   std::unique_ptr<Core> core_;
63   scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner_;
64   webrtc::DesktopCapturer::Callback* callback_;
65 
66   // Used to disconnect the client session.
67   // Note: This cannot be used on Windows because the ClientSession is not in
68   // the same process as the DesktopCapturerProxy.
69   base::WeakPtr<ClientSessionControl> client_session_control_;
70 
71   // Contains the most recently gathered info about the desktop displays.
72   std::unique_ptr<DesktopDisplayInfo> desktop_display_info_;
73 
74   base::WeakPtrFactory<DesktopCapturerProxy> weak_factory_{this};
75 
76   DISALLOW_COPY_AND_ASSIGN(DesktopCapturerProxy);
77 };
78 
79 }  // namespace remoting
80 
81 #endif  // REMOTING_HOST_DESKTOP_CAPTURER_PROXY_H_
82