content/browser/media/media_internals.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 CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
   6 #define CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/callback_forward.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/lazy_instance.h"
  14 #include "base/strings/string16.h"
  15 #include "base/synchronization/lock.h"
  16 #include "base/values.h"
  17 #include "content/common/content_export.h"
  18 #include "media/audio/audio_logging.h"
  19 #include "media/base/media_log.h"
  20 #include "media/video/capture/video_capture_device_info.h"
  21
  22 namespace media {
  23 class AudioParameters;
  24 struct MediaLogEvent;
  25 }
  26
  27 namespace content {
  28
  29 // This class stores information about currently active media.
  30 class CONTENT_EXPORT MediaInternals
  31     : NON_EXPORTED_BASE(public media::AudioLogFactory) {
  32  public:
  33   // Called with the update string.
  34   typedef base::Callback<void(const base::string16&)> UpdateCallback;
  35
  36   static MediaInternals* GetInstance();
  37
  38   ~MediaInternals() override;
  39
  40   // Called when a MediaEvent occurs.
  41   void OnMediaEvents(int render_process_id,
  42                      const std::vector<media::MediaLogEvent>& events);
  43
  44   // Add/remove update callbacks (see above).  Must be called on the IO thread.
  45   void AddUpdateCallback(const UpdateCallback& callback);
  46   void RemoveUpdateCallback(const UpdateCallback& callback);
  47
  48   // Sends all audio cached data to each registered UpdateCallback.
  49   void SendAudioStreamData();
  50
  51   // Sends all video capture capabilities cached data to each registered
  52   // UpdateCallback.
  53   void SendVideoCaptureDeviceCapabilities();
  54
  55   // Called to inform of the capabilities enumerated for video devices.
  56   void UpdateVideoCaptureDeviceCapabilities(
  57       const media::VideoCaptureDeviceInfos& video_capture_device_infos);
  58
  59   // AudioLogFactory implementation.  Safe to call from any thread.
  60   scoped_ptr<media::AudioLog> CreateAudioLog(AudioComponent component) override;
  61
  62  private:
  63   // Inner class to handle reporting pipelinestatus to UMA
  64   class MediaInternalsUMAHandler;
  65
  66   friend class AudioLogImpl;
  67   friend class MediaInternalsTest;
  68   friend struct base::DefaultLazyInstanceTraits<MediaInternals>;
  69
  70   MediaInternals();
  71
  72   // Sends |update| to each registered UpdateCallback.  Safe to call from any
  73   // thread, but will forward to the IO thread.
  74   void SendUpdate(const base::string16& update);
  75
  76   // Caches |value| under |cache_key| so that future SendAudioStreamData() calls
  77   // will include the current data.  Calls JavaScript |function|(|value|) for
  78   // each registered UpdateCallback.  SendUpdateAndPurgeCache() is similar but
  79   // purges the cache entry after completion instead.
  80   void SendUpdateAndCacheAudioStreamKey(const std::string& cache_key,
  81                                         const std::string& function,
  82                                         const base::DictionaryValue* value);
  83   void SendUpdateAndPurgeAudioStreamCache(const std::string& cache_key,
  84                                           const std::string& function,
  85                                           const base::DictionaryValue* value);
  86
  87   // Must only be accessed on the IO thread.
  88   std::vector<UpdateCallback> update_callbacks_;
  89   base::ListValue video_capture_capabilities_cached_data_;
  90
  91   // All variables below must be accessed under |lock_|.
  92   base::Lock lock_;
  93   base::DictionaryValue audio_streams_cached_data_;
  94   int owner_ids_[AUDIO_COMPONENT_MAX];
  95   scoped_ptr<MediaInternalsUMAHandler> uma_handler_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(MediaInternals);
  98 };
  99
 100 }  // namespace content
 101
 102 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_