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      1 // Copyright (c) 2013 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 CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_H_
      6 #define CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "content/common/content_export.h"
     11 #include "content/public/browser/desktop_media_id.h"
     12 #include "media/video/capture/video_capture_device.h"
     13 #include "ui/gfx/native_widget_types.h"
     14 
     15 namespace base {
     16 class SequencedTaskRunner;
     17 class Thread;
     18 }  // namespace base
     19 
     20 namespace webrtc {
     21 class DesktopCapturer;
     22 }  // namespace webrtc
     23 
     24 namespace content {
     25 
     26 // DesktopCaptureDevice implements VideoCaptureDevice for screens and windows.
     27 // It's essentially an adapter between webrtc::DesktopCapturer and
     28 // VideoCaptureDevice.
     29 class CONTENT_EXPORT DesktopCaptureDevice : public media::VideoCaptureDevice {
     30  public:
     31   // Creates capturer for the specified |source| and then creates
     32   // DesktopCaptureDevice for it. May return NULL in case of a failure (e.g. if
     33   // requested window was destroyed).
     34   static scoped_ptr<media::VideoCaptureDevice> Create(
     35       const DesktopMediaID& source);
     36 
     37   virtual ~DesktopCaptureDevice();
     38 
     39   // VideoCaptureDevice interface.
     40   virtual void AllocateAndStart(const media::VideoCaptureParams& params,
     41                                 scoped_ptr<Client> client) OVERRIDE;
     42   virtual void StopAndDeAllocate() OVERRIDE;
     43 
     44   // Set the platform-dependent window id for the notification window.
     45   void SetNotificationWindowId(gfx::NativeViewId window_id);
     46 
     47  private:
     48   friend class DesktopCaptureDeviceTest;
     49   class Core;
     50 
     51   // Either |task_runner| or |thread| should be non-NULL, but not both.
     52   DesktopCaptureDevice(scoped_refptr<base::SequencedTaskRunner> task_runner,
     53                        scoped_ptr<base::Thread> thread,
     54                        scoped_ptr<webrtc::DesktopCapturer> desktop_capturer,
     55                        DesktopMediaID::Type type);
     56 
     57   scoped_refptr<Core> core_;
     58 
     59   DISALLOW_COPY_AND_ASSIGN(DesktopCaptureDevice);
     60 };
     61 
     62 }  // namespace content
     63 
     64 #endif  // CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_H_
     65