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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)> ResponseCallback;
     25 
     26   static scoped_ptr<MediaStreamUIProxy> Create();
     27   static scoped_ptr<MediaStreamUIProxy> CreateForTests(
     28       RenderViewHostDelegate* render_delegate);
     29 
     30   virtual ~MediaStreamUIProxy();
     31 
     32   // Requests access for the MediaStream by calling
     33   // WebContentsDelegate::RequestMediaAccessPermission(). The specified
     34   // |response_callback| is called when the WebContentsDelegate approves or
     35   // denies request.
     36   virtual void RequestAccess(const MediaStreamRequest& request,
     37                              const ResponseCallback& response_callback);
     38 
     39   // Notifies the UI that the MediaStream has been started. Must be called after
     40   // access has been approved using RequestAccess(). |stop_callback| is be
     41   // called on the IO thread after the user has requests the stream to be
     42   // stopped.
     43   virtual void OnStarted(const base::Closure& stop_callback);
     44 
     45   void SetRenderViewHostDelegateForTests(RenderViewHostDelegate* delegate);
     46 
     47  protected:
     48   MediaStreamUIProxy(RenderViewHostDelegate* test_render_delegate);
     49 
     50  private:
     51   class Core;
     52   friend class Core;
     53   friend class FakeMediaStreamUIProxy;
     54 
     55   void ProcessAccessRequestResponse(const MediaStreamDevices& devices);
     56   void ProcessStopRequestFromUI();
     57 
     58   scoped_ptr<Core> core_;
     59   ResponseCallback response_callback_;
     60   base::Closure stop_callback_;
     61 
     62   base::WeakPtrFactory<MediaStreamUIProxy> weak_factory_;
     63 
     64   DISALLOW_COPY_AND_ASSIGN(MediaStreamUIProxy);
     65 };
     66 
     67 class CONTENT_EXPORT FakeMediaStreamUIProxy : public MediaStreamUIProxy {
     68  public:
     69   explicit FakeMediaStreamUIProxy();
     70   virtual ~FakeMediaStreamUIProxy();
     71 
     72   void SetAvailableDevices(const MediaStreamDevices& devices);
     73 
     74   // MediaStreamUIProxy overrides.
     75   virtual void RequestAccess(
     76       const MediaStreamRequest& request,
     77       const ResponseCallback& response_callback) OVERRIDE;
     78   virtual void OnStarted(const base::Closure& stop_callback) OVERRIDE;
     79 
     80  private:
     81   MediaStreamDevices devices_;
     82 
     83   DISALLOW_COPY_AND_ASSIGN(FakeMediaStreamUIProxy);
     84 };
     85 
     86 }  // namespace content
     87 
     88 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_UI_PROXY_H_
     89