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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_BASE_DECRYPTOR_H_ | 5 #ifndef MEDIA_BASE_DECRYPTOR_H_ |
6 #define MEDIA_BASE_DECRYPTOR_H_ | 6 #define MEDIA_BASE_DECRYPTOR_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
11 #include "base/callback.h" | 11 #include "base/callback.h" |
12 #include "base/memory/ref_counted.h" | 12 #include "base/memory/ref_counted.h" |
13 #include "media/base/media_export.h" | 13 #include "media/base/media_export.h" |
14 | 14 |
15 namespace media { | 15 namespace media { |
16 | 16 |
17 class DecoderBuffer; | 17 class DecoderBuffer; |
18 | 18 |
19 // Performs key operations and decrypts encrypted buffer. | 19 // Performs key operations and decrypts encrypted buffer. |
20 // All public methods other than Decrypt() will be called on the renderer | 20 // All public methods other than Decrypt() will be called on the renderer |
21 // thread. Therefore, these calls should be fast and nonblocking, with key | 21 // thread. Therefore, these calls should be fast and nonblocking, with key |
22 // events fired asynchronously. Decrypt() will be called on the (video/audio) | 22 // events fired asynchronously. Decrypt() will be called on the (video/audio) |
23 // decoder thread synchronously. | 23 // decoder thread. |
24 class MEDIA_EXPORT Decryptor { | 24 class MEDIA_EXPORT Decryptor { |
25 public: | 25 public: |
26 enum KeyError { | 26 enum KeyError { |
27 kUnknownError = 1, | 27 kUnknownError = 1, |
28 kClientError, | 28 kClientError, |
29 kServiceError, | 29 kServiceError, |
30 kOutputError, | 30 kOutputError, |
31 kHardwareChangeError, | 31 kHardwareChangeError, |
32 kDomainError | 32 kDomainError |
33 }; | 33 }; |
34 | 34 |
35 enum DecryptStatus { | 35 enum DecryptStatus { |
36 kSuccess, // Decryption successfully completed. Decrypted buffer ready. | 36 kSuccess, // Decryption successfully completed. Decrypted buffer ready. |
37 kError // Error occurred during decryption. | 37 kNoKey, // No key is available to decrypt. |
| 38 kError // Key is available but an error occurred during decryption. |
38 }; | 39 }; |
39 | 40 |
40 Decryptor() {} | 41 Decryptor() {} |
41 virtual ~Decryptor() {} | 42 virtual ~Decryptor() {} |
42 | 43 |
43 // Generates a key request for the |key_system| with |init_data| provided. | 44 // Generates a key request for the |key_system| with |init_data| provided. |
44 virtual void GenerateKeyRequest(const std::string& key_system, | 45 virtual void GenerateKeyRequest(const std::string& key_system, |
45 const uint8* init_data, | 46 const uint8* init_data, |
46 int init_data_length) = 0; | 47 int init_data_length) = 0; |
47 | 48 |
(...skipping 13 matching lines...) Expand all Loading... |
61 const std::string& session_id) = 0; | 62 const std::string& session_id) = 0; |
62 | 63 |
63 // Decrypts the |encrypted| buffer. The decrypt status and decrypted buffer | 64 // Decrypts the |encrypted| buffer. The decrypt status and decrypted buffer |
64 // are returned via the provided callback |decrypt_cb|. The |encrypted| buffer | 65 // are returned via the provided callback |decrypt_cb|. The |encrypted| buffer |
65 // must not be NULL. | 66 // must not be NULL. |
66 // | 67 // |
67 // Note that the callback maybe called synchronously or asynchronously. | 68 // Note that the callback maybe called synchronously or asynchronously. |
68 // | 69 // |
69 // If the returned status is kSuccess, the |encrypted| buffer is successfully | 70 // If the returned status is kSuccess, the |encrypted| buffer is successfully |
70 // decrypted and the decrypted buffer is ready to be read. | 71 // decrypted and the decrypted buffer is ready to be read. |
| 72 // If the returned status is kNoKey, no decryption key is available to decrypt |
| 73 // |encrypted| buffer. In this case the decrypted buffer must be NULL. |
71 // If the returned status is kError, unexpected error has occurred. In this | 74 // If the returned status is kError, unexpected error has occurred. In this |
72 // case the decrypted buffer must be NULL. | 75 // case the decrypted buffer must be NULL. |
73 typedef base::Callback<void(DecryptStatus, | 76 typedef base::Callback<void(DecryptStatus, |
74 const scoped_refptr<DecoderBuffer>&)> DecryptCB; | 77 const scoped_refptr<DecoderBuffer>&)> DecryptCB; |
75 virtual void Decrypt(const scoped_refptr<DecoderBuffer>& encrypted, | 78 virtual void Decrypt(const scoped_refptr<DecoderBuffer>& encrypted, |
76 const DecryptCB& decrypt_cb) = 0; | 79 const DecryptCB& decrypt_cb) = 0; |
77 | 80 |
| 81 // Stops the decryptor and fires any pending DecryptCB immediately with kError |
| 82 // and NULL buffer. |
| 83 virtual void Stop() = 0; |
| 84 |
78 private: | 85 private: |
79 DISALLOW_COPY_AND_ASSIGN(Decryptor); | 86 DISALLOW_COPY_AND_ASSIGN(Decryptor); |
80 }; | 87 }; |
81 | 88 |
82 } // namespace media | 89 } // namespace media |
83 | 90 |
84 #endif // MEDIA_BASE_DECRYPTOR_H_ | 91 #endif // MEDIA_BASE_DECRYPTOR_H_ |
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