media/cdm/key_system_names.cc

   1 // Copyright 2013 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 #include "media/cdm/key_system_names.h"
   6
   7
   8 namespace media {
   9
  10 const char kClearKey[] = "org.w3.clearkey";
  11 const char kExternalClearKey[] = "org.chromium.externalclearkey";
  12
  13 bool IsClearKey(const std::string& key_system) {
  14   return key_system == kClearKey;
  15 }
  16
  17 bool IsParentKeySystemOf(const std::string& parent_key_system,
  18                          const std::string& key_system) {
  19   std::string prefix = parent_key_system + '.';
  20   return key_system.substr(0, prefix.size()) == prefix;
  21 }
  22
  23 bool IsExternalClearKey(const std::string& key_system) {
  24   return key_system == kExternalClearKey ||
  25          IsParentKeySystemOf(kExternalClearKey, key_system);
  26 }
  27
  28 }  // namespace media