decrypt_config.h

// 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 MEDIA_BASE_DECRYPT_CONFIG_H_
#define MEDIA_BASE_DECRYPT_CONFIG_H_

#include <stdint.h>

#include <string>
#include <vector>

#include "packager/base/memory/scoped_ptr.h"

namespace edash_packager {
namespace media {

struct SubsampleEntry {
  uint16_t clear_bytes;
  uint32_t cipher_bytes;
};

class DecryptConfig {
 public:
  static const size_t kDecryptionKeySize = 16;

  DecryptConfig(const std::vector<uint8_t>& key_id,
                const std::vector<uint8_t>& iv,
                const int data_offset,
                const std::vector<SubsampleEntry>& subsamples);
  ~DecryptConfig();

  const std::vector<uint8_t>& key_id() const { return key_id_; }
  const std::vector<uint8_t>& iv() const { return iv_; }
  int data_offset() const { return data_offset_; }
  const std::vector<SubsampleEntry>& subsamples() const { return subsamples_; }

 private:
  const std::vector<uint8_t> key_id_;

  // Initialization vector.
  const std::vector<uint8_t> iv_;

  // Amount of data to be discarded before applying subsample information.
  const int data_offset_;

  // 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 edash_packager

#endif  // MEDIA_BASE_DECRYPT_CONFIG_H_