chromecast/media/base/decrypt_context_impl.h

// Copyright 2014 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 CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_
#define CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_

#include <stdint.h>

#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "chromecast/media/base/key_systems_common.h"
#include "chromecast/public/media/decrypt_context.h"

namespace crypto {
class SymmetricKey;
}

namespace chromecast {
namespace media {

// Base class of a decryption context: a decryption context gathers all the
// information needed to decrypt frames with a given key id.
// Each CDM should implement this and add fields needed to fully describe a
// decryption context.
//
class DecryptContextImpl : public DecryptContext {
 public:
  explicit DecryptContextImpl(CastKeySystem key_system);
  ~DecryptContextImpl() override;

  // DecryptContext implementation:
  CastKeySystem GetKeySystem() override;
  bool Decrypt(CastDecoderBuffer* buffer,
               std::vector<uint8_t>* output) override;

  // Returns the clear key if available, NULL otherwise.
  virtual crypto::SymmetricKey* GetKey() const;

 private:
  CastKeySystem key_system_;

  DISALLOW_COPY_AND_ASSIGN(DecryptContextImpl);
};

}  // namespace media
}  // namespace chromecast

#endif  // CHROMECAST_MEDIA_BASE_DECRYPT_CONTEXT_IMPL_H_