| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COBALT_MEDIA_BASE_DECRYPT_CONFIG_H_ |
| #define COBALT_MEDIA_BASE_DECRYPT_CONFIG_H_ |
| |
| #include <iosfwd> |
| #include <string> |
| #include <vector> |
| |
| #include "base/basictypes.h" |
| #include "cobalt/media/base/media_export.h" |
| #include "cobalt/media/base/subsample_entry.h" |
| #include "starboard/types.h" |
| |
| namespace cobalt { |
| namespace media { |
| |
| // Contains all information that a decryptor needs to decrypt a media sample. |
| class MEDIA_EXPORT DecryptConfig { |
| public: |
| // Keys are always 128 bits. |
| static const int kDecryptionKeySize = 16; |
| |
| // |key_id| is the ID that references the decryption key for this sample. |
| // |iv| is the initialization vector defined by the encrypted format. |
| // Currently |iv| must be 16 bytes as defined by WebM and ISO. Or must be |
| // empty which signals an unencrypted frame. |
| // |subsamples| defines the clear and encrypted portions of the sample as |
| // described above. A decrypted buffer will be equal in size to the sum |
| // of the subsample sizes. |
| DecryptConfig(const std::string& key_id, const std::string& iv, |
| const std::vector<SubsampleEntry>& subsamples); |
| ~DecryptConfig(); |
| |
| const std::string& key_id() const { return key_id_; } |
| const std::string& iv() const { return iv_; } |
| const std::vector<SubsampleEntry>& subsamples() const { return subsamples_; } |
| |
| // Returns true if the corresponding decoder buffer requires decryption and |
| // false if that buffer is clear despite the presense of DecryptConfig. |
| bool is_encrypted() const { return !key_id_.empty() && !iv_.empty(); } |
| |
| // Returns true if all fields in |config| match this config. |
| bool Matches(const DecryptConfig& config) const; |
| |
| // Prints to std::ostream. |
| std::ostream& Print(std::ostream& os) const; |
| |
| private: |
| const std::string key_id_; |
| |
| // Initialization vector. |
| const std::string iv_; |
| |
| // Subsample information. May be empty for some formats, meaning entire frame |
| // (less data ignored by data_offset_) is encrypted. |
| const std::vector<SubsampleEntry> subsamples_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DecryptConfig); |
| }; |
| |
| } // namespace media |
| } // namespace cobalt |
| |
| inline std::ostream& operator<<(std::ostream& os, |
| const cobalt::media::DecryptConfig& obj) { |
| return obj.Print(os); |
| } |
| |
| #endif // COBALT_MEDIA_BASE_DECRYPT_CONFIG_H_ |