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      1 // Copyright 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_RENDERER_HOST_MEDIA_MEDIA_STREAM_UI_PROXY_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_UI_PROXY_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "base/memory/weak_ptr.h"
     12 #include "content/public/common/media_stream_request.h"
     13 
     14 namespace content {
     15 
     16 class RenderViewHostDelegate;
     17 
     18 // MediaStreamUIProxy proxies calls to media stream UI between IO thread and UI
     19 // thread. One instance of this class is create per MediaStream object. It must
     20 // be create, used and destroyed on IO thread.
     21 class CONTENT_EXPORT MediaStreamUIProxy {
     22  public:
     23   typedef base::Callback<
     24       void (const MediaStreamDevices& devices,
     25             content::MediaStreamRequestResult result)>
     26         ResponseCallback;
     27 
     28   typedef base::Callback<void(gfx::NativeViewId window_id)> WindowIdCallback;
     29 
     30   static scoped_ptr<MediaStreamUIProxy> Create();
     31   static scoped_ptr<MediaStreamUIProxy> CreateForTests(
     32       RenderViewHostDelegate* render_delegate);
     33 
     34   virtual ~MediaStreamUIProxy();
     35 
     36   // Requests access for the MediaStream by calling
     37   // WebContentsDelegate::RequestMediaAccessPermission(). The specified
     38   // |response_callback| is called when the WebContentsDelegate approves or
     39   // denies request.
     40   virtual void RequestAccess(const MediaStreamRequest& request,
     41                              const ResponseCallback& response_callback);
     42 
     43   // Notifies the UI that the MediaStream has been started. Must be called after
     44   // access has been approved using RequestAccess(). |stop_callback| is be
     45   // called on the IO thread after the user has requests the stream to be
     46   // stopped. |window_id_callback| is called on the IO thread with the platform-
     47   // dependent window ID of the UI.
     48   virtual void OnStarted(const base::Closure& stop_callback,
     49                          const WindowIdCallback& window_id_callback);
     50 
     51   void SetRenderViewHostDelegateForTests(RenderViewHostDelegate* delegate);
     52 
     53  protected:
     54   MediaStreamUIProxy(RenderViewHostDelegate* test_render_delegate);
     55 
     56  private:
     57   class Core;
     58   friend class Core;
     59   friend class FakeMediaStreamUIProxy;
     60 
     61   void ProcessAccessRequestResponse(
     62       const MediaStreamDevices& devices,
     63       content::MediaStreamRequestResult result);
     64   void ProcessStopRequestFromUI();
     65   void OnWindowId(const WindowIdCallback& window_id_callback,
     66                   gfx::NativeViewId* window_id);
     67 
     68   scoped_ptr<Core> core_;
     69   ResponseCallback response_callback_;
     70   base::Closure stop_callback_;
     71 
     72   base::WeakPtrFactory<MediaStreamUIProxy> weak_factory_;
     73 
     74   DISALLOW_COPY_AND_ASSIGN(MediaStreamUIProxy);
     75 };
     76 
     77 class CONTENT_EXPORT FakeMediaStreamUIProxy : public MediaStreamUIProxy {
     78  public:
     79   explicit FakeMediaStreamUIProxy();
     80   virtual ~FakeMediaStreamUIProxy();
     81 
     82   void SetAvailableDevices(const MediaStreamDevices& devices);
     83 
     84   // MediaStreamUIProxy overrides.
     85   virtual void RequestAccess(
     86       const MediaStreamRequest& request,
     87       const ResponseCallback& response_callback) OVERRIDE;
     88   virtual void OnStarted(const base::Closure& stop_callback,
     89                          const WindowIdCallback& window_id_callback) OVERRIDE;
     90 
     91  private:
     92   MediaStreamDevices devices_;
     93 
     94   DISALLOW_COPY_AND_ASSIGN(FakeMediaStreamUIProxy);
     95 };
     96 
     97 }  // namespace content
     98 
     99 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_UI_PROXY_H_
    100