Initial import of Widevine Common Encryption DRM engine

Builds libwvmdrmengine.so, which is loaded by the new
MediaDrm APIs to support playback of Widevine/CENC
protected content.

Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c

libwvdrmengine/cdm/core/include/crypto_engine.h

@@ -0,0 +1,61 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// OEMCrypto Client - wrapper class for C-style OEMCrypto interface
+//
+#ifndef CDM_BASE_CRYPTO_ENGINE_H_
+#define CDM_BASE_CRYPTO_ENGINE_H_
+
+#include "crypto_session.h"
+#include "lock.h"
+#include "wv_cdm_types.h"
+
+namespace wvcdm {
+
+typedef std::map<CdmSessionId,CryptoSession*> CryptoSessionMap;
+
+class CryptoEngine {
+
+  friend class CryptoSession;
+
+ private:
+
+  CryptoEngine();
+  ~CryptoEngine();
+
+ public:
+
+  // get an instance of Crypto engine
+  static CryptoEngine* GetInstance();
+
+  bool Init();
+  bool Terminate();
+  bool ValidateKeybox();
+
+  CryptoSession* CreateSession(const CdmSessionId& session_id);
+  CryptoSession* FindSession(const CdmSessionId& session_id);
+  bool DestroySession(const CdmSessionId& session_id);
+  bool DestroySessions();
+
+  bool GetToken(std::string* token);
+
+private:
+
+  void DeleteInstance();
+  static CryptoEngine* CreateSingleton();
+
+  CryptoSession* FindSessionInternal(const CdmSessionId& session_id);
+
+  static CryptoEngine* crypto_engine_;
+  static Lock crypto_engine_lock_;
+
+  bool initialized_;
+  mutable Lock crypto_lock_;
+  mutable Lock sessions_lock_;
+  CryptoSessionMap sessions_;
+
+  CORE_DISALLOW_COPY_AND_ASSIGN(CryptoEngine);
+};
+
+}; // namespace wvcdm
+
+#endif  // CDM_BASE_CRYPTO_ENGINE_H_