Move SessionIdAdapter out of WebContentDecryptionModuleImpl

content/renderer/media/cdm_session_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_ADAPTER_H_
+#define CONTENT_RENDERER_MEDIA_CDM_SESSION_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"
+#include "third_party/WebKit/public/platform/WebContentDecryptionModuleSession.h"
+
+namespace content {
+
+class WebContentDecryptionModuleSessionImpl;
+
+// Owns the CDM instance and makes calls from session objects to the CDM.
+// Forwards the session ID-based callbacks of the MediaKeys interface to the
+// appropriate session object. Callers should hold references to this class
+// as long as they need the CDM instance.
+class CdmSessionAdapter : public base::RefCounted<CdmSessionAdapter> {
+ public:
+  CdmSessionAdapter();
+
+  // Returns true on success.
+  bool Initialize(const std::string& key_system);
+
+  // Creates a new session and adds it to the internal map. The caller owns the
+  // created session. RemoveSession() must be called when destroying it.
+  WebContentDecryptionModuleSessionImpl* CreateSession(
+      blink::WebContentDecryptionModuleSession::Client* client);
+
+  // Removes a session from the internal map.
+  void RemoveSession(uint32 session_id);
+
+  // Initializes the session specified by |session_id| with the |content_type|
+  // and |init_data| provided.
+  void InitializeNewSession(uint32 session_id,
+                            const std::string& content_type,
+                            const uint8* init_data,
+                            int init_data_length);
+
+  // Updates the 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 is 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<CdmSessionAdapter>;
+  typedef std::map<uint32, WebContentDecryptionModuleSessionImpl*> SessionMap;
+
+  ~CdmSessionAdapter();
+
+  // 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);
+
+  scoped_ptr<media::MediaKeys> media_keys_;
+
+  base::WeakPtrFactory<CdmSessionAdapter> 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(CdmSessionAdapter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_CDM_SESSION_ADAPTER_H_