media/base/player_tracker.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 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_