content/renderer/media/render_media_client.h

   1 // Copyright 2014 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_MEDIA_RENDER_MEDIA_CLIENT_H_
   6 #define CONTENT_RENDERER_MEDIA_RENDER_MEDIA_CLIENT_H_
   7
   8 #include "base/lazy_instance.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/threading/thread_checker.h"
  11 #include "base/time/tick_clock.h"
  12 #include "base/time/time.h"
  13 #include "content/common/content_export.h"
  14 #include "media/base/media_client.h"
  15
  16 #include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
  17
  18 namespace content {
  19
  20 class CONTENT_EXPORT RenderMediaClient : public media::MediaClient {
  21  public:
  22   // Initialize RenderMediaClient and SetMediaClient(). Note that the instance
  23   // is not exposed because no content code needs to directly access it.
  24   static void Initialize();
  25
  26   // MediaClient implementation.
  27   void AddKeySystemsInfoForUMA(std::vector<media::KeySystemInfoForUMA>*
  28                                    key_systems_info_for_uma) override;
  29   bool IsKeySystemsUpdateNeeded() override;
  30   void AddSupportedKeySystems(
  31       std::vector<media::KeySystemInfo>* key_systems_info) override;
  32
  33   void SetTickClockForTesting(scoped_ptr<base::TickClock> tick_clock);
  34
  35  private:
  36   friend struct base::DefaultLazyInstanceTraits<RenderMediaClient>;
  37
  38   RenderMediaClient();
  39   ~RenderMediaClient() override;
  40
  41   // Makes sure all methods are called from the same thread.
  42   base::ThreadChecker thread_checker_;
  43
  44   // Whether AddSupportedKeySystems() has ever been called.
  45   bool has_updated_;
  46
  47   // Whether a future update is needed. For example, when some potentially
  48   // supported key systems are NOT supported yet. This could happen when the
  49   // required component for a key system is not yet available.
  50   bool is_update_needed_;
  51
  52   base::TimeTicks last_update_time_ticks_;
  53   scoped_ptr<base::TickClock> tick_clock_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(RenderMediaClient);
  56 };
  57
  58 #if defined(UNIT_TEST)
  59 // Helper function to access the RenderMediaClient instance. Used only by unit
  60 // tests.
  61 CONTENT_EXPORT RenderMediaClient* GetRenderMediaClientInstanceForTesting();
  62 #endif
  63
  64 }  // namespace content
  65
  66 #endif  // CONTENT_RENDERER_MEDIA_RENDER_MEDIA_CLIENT_H_