Move SessionIdAdapter out of WebContentDecryptionModuleImpl

content/renderer/media/cdm_session_id_adapter.h

+// Copyright 2014 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_RENDERER_MEDIA_CDM_SESSION_ID_ADAPTER_H_
+#define CONTENT_RENDERER_MEDIA_CDM_SESSION_ID_ADAPTER_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/media_keys.h"
+
+namespace content {
+class WebContentDecryptionModuleSessionImpl;
+
+// Forwards the session ID-based callbacks of the MediaKeys interface to the
+// appropriate session object. Both WebContentDecryptionModuleImpl and
+// WebContentDecryptionModuleSessionImpl will hold references to this object.
+class CdmSessionIdAdapter : public base::RefCounted<CdmSessionIdAdapter> {
+ public:
+  CdmSessionIdAdapter();
+
+  // On success returns true.
+  bool Initialize(const std::string& key_system);
+
+  // Generates a unique internal session id.
+  uint32 GenerateSessionId();
+
+  // Adds a session to the internal map. Does not take ownership of the session.
+  void AddSession(uint32 session_id,
+                  WebContentDecryptionModuleSessionImpl* session);
+
+  // Removes a session from the internal map.
+  void RemoveSession(uint32 session_id);
+
+  // Creates a session with the |content_type| and |init_data| provided.
+  bool CreateSession(uint32 session_id,
+                     const std::string& content_type,
+                     const uint8* init_data,
+                     int init_data_length);
+
+  // Updates a session specified by |session_id| with |response|.
+  void UpdateSession(uint32 session_id,
+                     const uint8* response,
+                     int response_length);
+
+  // Releases the session specified by |session_id|.
+  void ReleaseSession(uint32 session_id);
+
+  // Returns the Decryptor associated with this CDM. May be NULL if no
+  // Decryptor associated with the MediaKeys object.
+  // TODO(jrummell): Figure out lifetimes, as WMPI may still use the decryptor
+  // after WebContentDecryptionModule is freed. http://crbug.com/330324
+  media::Decryptor* GetDecryptor();
+
+ private:
+  friend class base::RefCounted<CdmSessionIdAdapter>;
+  typedef std::map<uint32, WebContentDecryptionModuleSessionImpl*> SessionMap;
+
+  ~CdmSessionIdAdapter();
+
+  // Callbacks for firing session events.
+  void OnSessionCreated(uint32 session_id, const std::string& web_session_id);
+  void OnSessionMessage(uint32 session_id,
+                        const std::vector<uint8>& message,
+                        const std::string& destination_url);
+  void OnSessionReady(uint32 session_id);
+  void OnSessionClosed(uint32 session_id);
+  void OnSessionError(uint32 session_id,
+                      media::MediaKeys::KeyError error_code,
+                      int system_code);
+
+  // Helper function of the callbacks.
+  WebContentDecryptionModuleSessionImpl* GetSession(uint32 session_id);
+
+  // Keep ownership of MediaKeys.
+  scoped_ptr<media::MediaKeys> media_keys_;
+
+  base::WeakPtrFactory<CdmSessionIdAdapter> weak_ptr_factory_;
+
+  SessionMap sessions_;
+
+  // Session ID should be unique per renderer process for debugging purposes.
+  static uint32 next_session_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(CdmSessionIdAdapter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_CDM_SESSION_ID_ADAPTER_H_