chrome/browser/media/media_capture_devices_dispatcher.h

   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 CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
   6 #define CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
   7
   8 #include <deque>
   9 #include <list>
  10 #include <map>
  11
  12 #include "base/callback.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/scoped_vector.h"
  15 #include "base/memory/singleton.h"
  16 #include "base/observer_list.h"
  17 #include "content/public/browser/media_observer.h"
  18 #include "content/public/browser/web_contents_delegate.h"
  19 #include "content/public/common/media_stream_request.h"
  20
  21 class DesktopStreamsRegistry;
  22 class MediaAccessHandler;
  23 class MediaStreamCaptureIndicator;
  24 class Profile;
  25
  26 namespace extensions {
  27 class Extension;
  28 }
  29
  30 namespace user_prefs {
  31 class PrefRegistrySyncable;
  32 }
  33
  34 // This singleton is used to receive updates about media events from the content
  35 // layer.
  36 class MediaCaptureDevicesDispatcher : public content::MediaObserver {
  37  public:
  38   class Observer {
  39    public:
  40     // Handle an information update consisting of a up-to-date audio capture
  41     // device lists. This happens when a microphone is plugged in or unplugged.
  42     virtual void OnUpdateAudioDevices(
  43         const content::MediaStreamDevices& devices) {}
  44
  45     // Handle an information update consisting of a up-to-date video capture
  46     // device lists. This happens when a camera is plugged in or unplugged.
  47     virtual void OnUpdateVideoDevices(
  48         const content::MediaStreamDevices& devices) {}
  49
  50     // Handle an information update related to a media stream request.
  51     virtual void OnRequestUpdate(
  52         int render_process_id,
  53         int render_frame_id,
  54         content::MediaStreamType stream_type,
  55         const content::MediaRequestState state) {}
  56
  57     // Handle an information update that a new stream is being created.
  58     virtual void OnCreatingAudioStream(int render_process_id,
  59                                        int render_frame_id) {}
  60
  61     virtual ~Observer() {}
  62   };
  63
  64   static MediaCaptureDevicesDispatcher* GetInstance();
  65
  66   // Registers the preferences related to Media Stream default devices.
  67   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  68
  69   // Returns true if the security origin is associated with casting.
  70   static bool IsOriginForCasting(const GURL& origin);
  71
  72   // Methods for observers. Called on UI thread.
  73   // Observers should add themselves on construction and remove themselves
  74   // on destruction.
  75   void AddObserver(Observer* observer);
  76   void RemoveObserver(Observer* observer);
  77   const content::MediaStreamDevices& GetAudioCaptureDevices();
  78   const content::MediaStreamDevices& GetVideoCaptureDevices();
  79
  80   // Method called from WebCapturerDelegate implementations to process access
  81   // requests. |extension| is set to NULL if request was made from a drive-by
  82   // page.
  83   void ProcessMediaAccessRequest(
  84       content::WebContents* web_contents,
  85       const content::MediaStreamRequest& request,
  86       const content::MediaResponseCallback& callback,
  87       const extensions::Extension* extension);
  88
  89   // Method called from WebCapturerDelegate implementations to check media
  90   // access permission. Note that this does not query the user.
  91   bool CheckMediaAccessPermission(content::WebContents* web_contents,
  92                                   const GURL& security_origin,
  93                                   content::MediaStreamType type);
  94
  95   // Same as above but for an |extension|, which may not be NULL.
  96   bool CheckMediaAccessPermission(content::WebContents* web_contents,
  97                                   const GURL& security_origin,
  98                                   content::MediaStreamType type,
  99                                   const extensions::Extension* extension);
 100
 101   // Helper to get the default devices which can be used by the media request.
 102   // Uses the first available devices if the default devices are not available.
 103   // If the return list is empty, it means there is no available device on the
 104   // OS.
 105   // Called on the UI thread.
 106   void GetDefaultDevicesForProfile(Profile* profile,
 107                                    bool audio,
 108                                    bool video,
 109                                    content::MediaStreamDevices* devices);
 110
 111   // Helpers for picking particular requested devices, identified by raw id.
 112   // If the device requested is not available it will return NULL.
 113   const content::MediaStreamDevice*
 114   GetRequestedAudioDevice(const std::string& requested_audio_device_id);
 115   const content::MediaStreamDevice*
 116   GetRequestedVideoDevice(const std::string& requested_video_device_id);
 117
 118   // Returns the first available audio or video device, or NULL if no devices
 119   // are available.
 120   const content::MediaStreamDevice* GetFirstAvailableAudioDevice();
 121   const content::MediaStreamDevice* GetFirstAvailableVideoDevice();
 122
 123   // Unittests that do not require actual device enumeration should call this
 124   // API on the singleton. It is safe to call this multiple times on the
 125   // signleton.
 126   void DisableDeviceEnumerationForTesting();
 127
 128   // Overridden from content::MediaObserver:
 129   void OnAudioCaptureDevicesChanged() override;
 130   void OnVideoCaptureDevicesChanged() override;
 131   void OnMediaRequestStateChanged(int render_process_id,
 132                                   int render_frame_id,
 133                                   int page_request_id,
 134                                   const GURL& security_origin,
 135                                   content::MediaStreamType stream_type,
 136                                   content::MediaRequestState state) override;
 137   void OnCreatingAudioStream(int render_process_id,
 138                              int render_frame_id) override;
 139
 140   scoped_refptr<MediaStreamCaptureIndicator> GetMediaStreamCaptureIndicator();
 141
 142   DesktopStreamsRegistry* GetDesktopStreamsRegistry();
 143
 144   bool IsDesktopCaptureInProgress();
 145
 146   // Only for testing.
 147   void SetTestAudioCaptureDevices(const content::MediaStreamDevices& devices);
 148   void SetTestVideoCaptureDevices(const content::MediaStreamDevices& devices);
 149
 150  private:
 151   friend struct DefaultSingletonTraits<MediaCaptureDevicesDispatcher>;
 152
 153   MediaCaptureDevicesDispatcher();
 154   ~MediaCaptureDevicesDispatcher() override;
 155
 156   // Called by the MediaObserver() functions, executed on UI thread.
 157   void NotifyAudioDevicesChangedOnUIThread();
 158   void NotifyVideoDevicesChangedOnUIThread();
 159   void UpdateMediaRequestStateOnUIThread(
 160       int render_process_id,
 161       int render_frame_id,
 162       int page_request_id,
 163       const GURL& security_origin,
 164       content::MediaStreamType stream_type,
 165       content::MediaRequestState state);
 166   void OnCreatingAudioStreamOnUIThread(int render_process_id,
 167                                        int render_frame_id);
 168
 169   // Only for testing, a list of cached audio capture devices.
 170   content::MediaStreamDevices test_audio_devices_;
 171
 172   // Only for testing, a list of cached video capture devices.
 173   content::MediaStreamDevices test_video_devices_;
 174
 175   // A list of observers for the device update notifications.
 176   base::ObserverList<Observer> observers_;
 177
 178   // Flag used by unittests to disable device enumeration.
 179   bool is_device_enumeration_disabled_;
 180
 181   scoped_refptr<MediaStreamCaptureIndicator> media_stream_capture_indicator_;
 182
 183   scoped_ptr<DesktopStreamsRegistry> desktop_streams_registry_;
 184
 185   // Handlers for processing media access requests.
 186   ScopedVector<MediaAccessHandler> media_access_handlers_;
 187
 188   DISALLOW_COPY_AND_ASSIGN(MediaCaptureDevicesDispatcher);
 189 };
 190
 191 #endif  // CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_