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 MEDIA_BASE_PLAYER_TRACKER_H_ 6 #define MEDIA_BASE_PLAYER_TRACKER_H_ 7 8 #include "base/basictypes.h" 9 #include "base/callback.h" 10 #include "media/base/media_export.h" 11 12 namespace media { 13 14 // An interface for players to register to be notified when a new decryption key 15 // becomes available or when the CDM is unset. 16 class MEDIA_EXPORT PlayerTracker { 17 public: 18 virtual ~PlayerTracker(); 19 20 // Registers player callbacks with the CDM. 21 // - |new_key_cb| is fired when a new decryption key becomes available. 22 // - |cdm_unset_cb| is fired when the CDM is detached from the player. 23 // Returns a registration ID which can be used to unregister a player. 24 virtual int RegisterPlayer(const base::Closure& new_key_cb, 25 const base::Closure& cdm_unset_cb) = 0; 26 27 // Unregisters a previously registered player. This should be called when 28 // the CDM is detached from the player (e.g. setMediaKeys(0)), or when the 29 // player is destroyed. 30 virtual void UnregisterPlayer(int registration_id) = 0; 31 32 protected: 33 PlayerTracker(); 34 35 private: 36 DISALLOW_COPY_AND_ASSIGN(PlayerTracker); 37 }; 38 39 } // namespace media 40 41 #endif // MEDIA_BASE_PLAYER_TRACKER_H_ 42