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      1 // Copyright (c) 2012 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_RENDERER_PEPPER_PEPPER_MEDIA_DEVICE_MANAGER_H_
      6 #define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_DEVICE_MANAGER_H_
      7 
      8 #include <map>
      9 
     10 #include "base/memory/weak_ptr.h"
     11 #include "content/public/renderer/render_frame_observer.h"
     12 #include "content/public/renderer/render_frame_observer_tracker.h"
     13 #include "content/renderer/media/media_stream_dispatcher_eventhandler.h"
     14 #include "content/renderer/pepper/pepper_device_enumeration_host_helper.h"
     15 
     16 namespace content {
     17 class MediaStreamDispatcher;
     18 
     19 class PepperMediaDeviceManager
     20     : public MediaStreamDispatcherEventHandler,
     21       public PepperDeviceEnumerationHostHelper::Delegate,
     22       public RenderFrameObserver,
     23       public RenderFrameObserverTracker<PepperMediaDeviceManager>,
     24       public base::SupportsWeakPtr<PepperMediaDeviceManager> {
     25  public:
     26   static base::WeakPtr<PepperMediaDeviceManager> GetForRenderFrame(
     27       RenderFrame* render_frame);
     28   virtual ~PepperMediaDeviceManager();
     29 
     30   // PepperDeviceEnumerationHostHelper::Delegate implementation:
     31   virtual int EnumerateDevices(PP_DeviceType_Dev type,
     32                                const GURL& document_url,
     33                                const EnumerateDevicesCallback& callback)
     34       OVERRIDE;
     35   virtual void StopEnumerateDevices(int request_id) OVERRIDE;
     36 
     37   typedef base::Callback<void(int /* request_id */,
     38                               bool /* succeeded */,
     39                               const std::string& /* label */)>
     40       OpenDeviceCallback;
     41 
     42   // Opens the specified device. The request ID passed into the callback will be
     43   // the same as the return value. If successful, the label passed into the
     44   // callback identifies a audio/video steam, which can be used to call
     45   // CloseDevice() and GetSesssionID().
     46   int OpenDevice(PP_DeviceType_Dev type,
     47                  const std::string& device_id,
     48                  const GURL& document_url,
     49                  const OpenDeviceCallback& callback);
     50   // Cancels an request to open device, using the request ID returned by
     51   // OpenDevice(). It is guaranteed that the callback passed into OpenDevice()
     52   // won't be called afterwards.
     53   void CancelOpenDevice(int request_id);
     54   void CloseDevice(const std::string& label);
     55   // Gets audio/video session ID given a label.
     56   int GetSessionID(PP_DeviceType_Dev type, const std::string& label);
     57 
     58   // MediaStreamDispatcherEventHandler implementation.
     59   virtual void OnStreamGenerated(
     60       int request_id,
     61       const std::string& label,
     62       const StreamDeviceInfoArray& audio_device_array,
     63       const StreamDeviceInfoArray& video_device_array) OVERRIDE;
     64   virtual void OnStreamGenerationFailed(
     65       int request_id,
     66       content::MediaStreamRequestResult result) OVERRIDE;
     67   virtual void OnDeviceStopped(const std::string& label,
     68                                const StreamDeviceInfo& device_info) OVERRIDE;
     69   virtual void OnDevicesEnumerated(int request_id,
     70                                    const StreamDeviceInfoArray& device_array)
     71       OVERRIDE;
     72   virtual void OnDeviceOpened(int request_id,
     73                               const std::string& label,
     74                               const StreamDeviceInfo& device_info) OVERRIDE;
     75   virtual void OnDeviceOpenFailed(int request_id) OVERRIDE;
     76 
     77   // Stream type conversion.
     78   static MediaStreamType FromPepperDeviceType(PP_DeviceType_Dev type);
     79   static PP_DeviceType_Dev FromMediaStreamType(MediaStreamType type);
     80 
     81  private:
     82   explicit PepperMediaDeviceManager(RenderFrame* render_frame);
     83 
     84   // Called by StopEnumerateDevices() after returing to the event loop, to avoid
     85   // a reentrancy problem.
     86   void StopEnumerateDevicesDelayed(int request_id);
     87 
     88   void NotifyDeviceOpened(int request_id,
     89                           bool succeeded,
     90                           const std::string& label);
     91 
     92 
     93   MediaStreamDispatcher* GetMediaStreamDispatcher() const;
     94 
     95   int next_id_;
     96 
     97   typedef std::map<int, EnumerateDevicesCallback> EnumerateCallbackMap;
     98   EnumerateCallbackMap enumerate_callbacks_;
     99 
    100   typedef std::map<int, OpenDeviceCallback> OpenCallbackMap;
    101   OpenCallbackMap open_callbacks_;
    102 
    103   DISALLOW_COPY_AND_ASSIGN(PepperMediaDeviceManager);
    104 };
    105 
    106 }  // namespace content
    107 
    108 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_DEVICE_MANAGER_H_
    109