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