Add CdmService to keep track of CDMs

content/public/common/content_decryption_module_service.h

+// Copyright 2016 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 CONTENT_PUBLIC_COMMON_CONTENT_DECRYPTION_MODULE_SERVICE_H_
+#define CONTENT_PUBLIC_COMMON_CONTENT_DECRYPTION_MODULE_SERVICE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/files/file_path.h"
+#include "base/lazy_instance.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "base/version.h"
+#include "content/common/content_export.h"
+#include "content/public/common/content_decryption_module_registration.h"
+
+namespace content {
+
+class CONTENT_EXPORT ContentDecryptionModuleService {
+ public:
+  // Returns the ContentDecryptionModuleService singleton.
+  static ContentDecryptionModuleService* GetInstance();
+
+  // Registers |key_system|, replacing any entry that may exist for it (with
+  // same |version|). |module_library_path| is the path to the actual CDM
+  // (may be empty if the CDM is already included as part of the system),
+  // and |supported_codecs| is the list of codecs supported by this CDM
+  // (which may be none).
+  void Register(const std::string& key_system,
+                const std::string& version,
+                const base::FilePath& module_library_path,
+                const std::vector<base::string16>& supported_codecs,
+                const std::vector<base::string16>& supported_init_data_types);
+
+  // Determines if the CDM library path is set for |key_system| with specified
+  // |version|. If |version| is empty, then the latest registered version of
+  // |key_system| is used (if there is one). If found, true is returned and
+  // |module_library_path| is updated. Otherwise false is returned and
+  // |module_library_path| is unchanged.
+  bool GetCdmLibraryPath(const std::string& key_system,
+                         const std::string& version,
+                         base::FilePath* module_library_path);
+
+  // Determines the codecs set for |key_system| with specified |version|.
+  // If |version| is empty, then the latest registered version of |key_system|
+  // is used (if there is one). If found, true is returned and
+  // |supported_codecs| is updated with the list of codecs registered for
+  // |key_system| (which may be none). Otherwise false is returned and
+  // |supported_codecs| is unchanged.
+  bool GetSupportedCodecs(const std::string& key_system,
+                          const std::string& version,
+                          std::vector<base::string16>* supported_codecs);
+
+  // Determines the InitDataType set for |key_system| with specified |version|.
+  // If |version| is empty, then the latest registered version of |key_system|
+  // is used (if there is one). If found, true is returned and
+  // |supported_init_data_types| is updated with the list of InitDataTypes
+  // registered for |key_system| (which may be none). Otherwise false is
+  // returned and |supported_init_data_types| is unchanged.
+  bool GetSupportedInitDataTypes(
+      const std::string& key_system,
+      const std::string& version,
+      std::vector<base::string16>* supported_init_data_types);
+
+  // Returns the list of all registered key systems and the matching path to
+  // the library. Note that multiple key systems may use the same library,
+  // so some of the paths in |key_systems| may be duplicated. Paths in
+  // |key_systems| may also be empty if the CDM is already included as
+  // part of the system.
+  void GetAllRegisteredModules(
+      std::vector<std::pair<std::string, base::FilePath>>* modules);
+
+ private:
+  friend struct base::DefaultLazyInstanceTraits<ContentDecryptionModuleService>;
+
+  ContentDecryptionModuleService();
+  ~ContentDecryptionModuleService();
+
+  // Finds the entry in |registered_modules_| that matches |key_system| and
+  // |version|. Returns NULL if not found.
+  ContentDecryptionModuleRegistration* FindEntry(const std::string& key_system,
+                                                 const std::string& version);
+
+  std::vector<ContentDecryptionModuleRegistration> registered_modules_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContentDecryptionModuleService);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_CONTENT_DECRYPTION_MODULE_SERVICE_H_