chromecast/media/base/decrypt_context_impl.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 CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_
   6 #define CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "chromecast/media/base/key_systems_common.h"
  11 #include "chromecast/public/media/decrypt_context.h"
  12
  13 namespace crypto {
  14 class SymmetricKey;
  15 }
  16
  17 namespace chromecast {
  18 namespace media {
  19
  20 // Base class of a decryption context: a decryption context gathers all the
  21 // information needed to decrypt frames with a given key id.
  22 // Each CDM should implement this and add fields needed to fully describe a
  23 // decryption context.
  24 //
  25 class DecryptContextImpl : public DecryptContext {
  26  public:
  27   explicit DecryptContextImpl(CastKeySystem key_system);
  28   ~DecryptContextImpl() override;
  29
  30   // DecryptContext implementation:
  31   CastKeySystem GetKeySystem() override;
  32   bool Decrypt(CastDecoderBuffer* buffer,
  33                std::vector<uint8_t>* output) override;
  34
  35   // Returns the clear key if available, NULL otherwise.
  36   virtual crypto::SymmetricKey* GetKey() const;
  37
  38  private:
  39   CastKeySystem key_system_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(DecryptContextImpl);
  42 };
  43
  44 }  // namespace media
  45 }  // namespace chromecast
  46
  47 #endif  // CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_