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/cdm_session.h

@@ -0,0 +1,100 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+
+#ifndef CDM_BASE_CDM_SESSION_H_
+#define CDM_BASE_CDM_SESSION_H_
+
+#include <set>
+
+#include "crypto_session.h"
+#include "license.h"
+#include "policy_engine.h"
+#include "wv_cdm_event_listener.h"
+#include "wv_cdm_types.h"
+
+namespace wvcdm {
+
+// TODO(kqyang): Do we need it? CdmKey not defined yet
+// typedef std::map<KeyId, CdmKey*> CdmSessionKeys;
+
+class CdmSession {
+ public:
+  CdmSession() : state_(INITIAL), session_id_(GenerateSessionId()) {}
+  ~CdmSession() {}
+
+  bool Init();
+
+  bool DestroySession();
+
+  void set_key_system(const CdmKeySystem& ksystem) { key_system_ = ksystem; }
+  const CdmKeySystem& key_system() { return key_system_; }
+
+  const CdmSessionId& session_id() { return session_id_; }
+
+  bool VerifySession(const CdmKeySystem& key_system,
+                     const CdmInitData& init_data);
+
+  CdmResponseType GenerateKeyRequest(const CdmInitData& init_data,
+                                     CdmKeyMessage* key_request);
+
+  // AddKey() - Accept license response and extract key info.
+  CdmResponseType AddKey(const CdmKeyResponse& key_response);
+
+  // CancelKeyRequest() - Cancel session.
+  CdmResponseType CancelKeyRequest();
+
+  // Decrypt() - Accept encrypted buffer and return decrypted data.
+  CdmResponseType Decrypt(const uint8_t* encrypted_buffer,
+                          size_t encrypted_size,
+                          size_t block_offset,
+                          const std::string& iv,
+                          const KeyId& key_id,
+                          uint8_t* decrypted_buffer);
+
+  // License renewal
+  // GenerateRenewalRequest() - Construct valid renewal request for the current
+  // session keys.
+  CdmResponseType GenerateRenewalRequest(CdmKeyMessage* key_request);
+
+  // RenewKey() - Accept renewal response and update key info.
+  CdmResponseType RenewKey(const CdmKeyResponse& key_response);
+
+  bool IsKeyValid(const KeyId& key_id);
+
+  bool AttachEventListener(WvCdmEventListener* listener);
+  bool DetachEventListener(WvCdmEventListener* listener);
+
+  void OnTimerEvent();
+
+ private:
+
+  // Generate unique ID for each new session.
+  CdmSessionId GenerateSessionId();
+
+  typedef enum {
+    INITIAL,
+    LICENSE_REQUESTED,
+    LICENSE_RESPONSE_DONE,
+    RENEWAL_ENABLED,
+    RENEWAL_REQUESTED,
+    LICENSE_EXPIRED
+  } CdmSessionState;
+
+  // instance variables
+  CdmSessionState state_;
+  const CdmSessionId session_id_;
+  CdmKeySystem key_system_;
+  CdmLicense license_parser_;
+  CryptoSession* crypto_session_;
+  PolicyEngine policy_engine_;
+
+  std::set<WvCdmEventListener*> listeners_;
+
+  // TODO(kqyang): CdmKey not defined yet
+  // CdmSessionKeys session_keys_;
+
+  CORE_DISALLOW_COPY_AND_ASSIGN(CdmSession);
+};
+
+}  // namespace wvcdm
+
+#endif  // CDM_BASE_CDM_SESSION_H_