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| 1 // Copyright 2017 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_RENDERER_MEDIA_CHROME_KEY_SYSTEMS_PROVIDER_H_ |
| 6 #define CHROME_RENDERER_MEDIA_CHROME_KEY_SYSTEMS_PROVIDER_H_ |
| 7 |
| 8 #include <memory> |
| 9 #include <vector> |
| 10 |
| 11 #include "base/callback.h" |
| 12 #include "base/threading/thread_checker.h" |
| 13 #include "base/time/tick_clock.h" |
| 14 #include "base/time/time.h" |
| 15 #include "media/base/key_system_properties.h" |
| 16 |
| 17 namespace chrome { |
| 18 |
| 19 typedef std::vector<std::unique_ptr<media::KeySystemProperties>> |
| 20 KeySystemPropertiesVector; |
| 21 typedef base::Callback<void(KeySystemPropertiesVector*)> |
| 22 KeySystemsProviderDelegate; |
| 23 |
| 24 class ChromeKeySystemsProvider { |
| 25 public: |
| 26 ChromeKeySystemsProvider(); |
| 27 ~ChromeKeySystemsProvider(); |
| 28 |
| 29 // Adds properties for supported key systems. |
| 30 void AddSupportedKeySystems(KeySystemPropertiesVector* key_systems); |
| 31 |
| 32 // Returns whether client key systems properties should be updated. |
| 33 // TODO(chcunningham): Refactor this to a proper change "observer" API that is |
| 34 // less fragile (don't assume AddSupportedKeySystems has just one caller). |
| 35 bool IsKeySystemsUpdateNeeded(); |
| 36 |
| 37 void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock); |
| 38 |
| 39 void SetProviderDelegateForTesting( |
| 40 const KeySystemsProviderDelegate& test_provider); |
| 41 |
| 42 private: |
| 43 // Whether AddSupportedKeySystems() has ever been called. |
| 44 bool has_updated_; |
| 45 |
| 46 // Whether a future update is needed. For example, when some potentially |
| 47 // supported key systems are NOT supported yet. This could happen when the |
| 48 // required component for a key system is not yet available. |
| 49 bool is_update_needed_; |
| 50 |
| 51 // Throttle how often we signal an update is needed to avoid unnecessary high |
| 52 // frequency of expensive IPC calls. |
| 53 base::TimeTicks last_update_time_ticks_; |
| 54 std::unique_ptr<base::TickClock> tick_clock_; |
| 55 |
| 56 // Ensure all methods are called from the same (Main) thread. |
| 57 base::ThreadChecker thread_checker_; |
| 58 |
| 59 // For unit tests to inject their own key systems. Will bypass adding default |
| 60 // Chrome key systems when set. |
| 61 KeySystemsProviderDelegate test_provider_; |
| 62 |
| 63 DISALLOW_COPY_AND_ASSIGN(ChromeKeySystemsProvider); |
| 64 }; |
| 65 |
| 66 } // namespace chrome |
| 67 |
| 68 #endif // CHROME_RENDERER_MEDIA_CHROME_KEY_SYSTEMS_PROVIDER_H_ |
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