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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 CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_H_ | |
6 #define CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/memory/ref_counted.h" | |
10 #include "chromecast/media/base/key_systems_common.h" | |
11 | |
12 namespace crypto { | |
13 class SymmetricKey; | |
14 } | |
15 | |
16 namespace chromecast { | |
17 namespace media { | |
18 | |
19 // Base class of a decryption context: a decryption context gathers all the | |
20 // information needed to decrypt frames with a given key id. | |
21 // Each CDM should implement this and add fields needed to fully describe a | |
22 // decryption context. | |
23 // | |
24 class DecryptContext : public base::RefCountedThreadSafe<DecryptContext> { | |
25 public: | |
26 explicit DecryptContext(CastKeySystem key_system); | |
27 | |
28 CastKeySystem key_system() const { return key_system_; } | |
29 | |
30 // Returns the clear key if available, NULL otherwise. | |
31 virtual crypto::SymmetricKey* GetKey() const; | |
32 | |
33 protected: | |
34 friend class base::RefCountedThreadSafe<DecryptContext>; | |
35 virtual ~DecryptContext(); | |
36 | |
37 private: | |
38 CastKeySystem key_system_; | |
39 | |
40 DISALLOW_COPY_AND_ASSIGN(DecryptContext); | |
41 }; | |
42 | |
43 } // namespace media | |
44 } // namespace chromecast | |
45 | |
46 #endif // CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_H_ | |
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