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// 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 <string>
#include "base/basictypes.h"
#include "base/containers/hash_tables.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"
#if defined(ENABLE_PEPPER_CDMS)
#include "content/renderer/media/crypto/pepper_cdm_wrapper.h"
#endif
class GURL;
namespace content {
#if defined(ENABLE_BROWSER_CDMS)
class RendererCdmManager;
#endif
class WebContentDecryptionModuleSessionImpl;
// Owns the CDM instance and makes calls from session objects to the CDM.
// Forwards the web 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(
#if defined(ENABLE_PEPPER_CDMS)
const CreatePepperCdmCB& create_pepper_cdm_cb,
#elif defined(ENABLE_BROWSER_CDMS)
RendererCdmManager* manager,
#endif
const std::string& key_system,
const GURL& security_origin);
// Creates a new session and adds it to the internal map. The caller owns the
// created session. RemoveSession() must be called when destroying it, if
// RegisterSession() was called.
WebContentDecryptionModuleSessionImpl* CreateSession();
// Adds a session to the internal map. Called once the session is successfully
// initialized. Returns true if the session was registered, false if there is
// already an existing session with the same |web_session_id|.
bool RegisterSession(
const std::string& web_session_id,
base::WeakPtr<WebContentDecryptionModuleSessionImpl> session);
// Removes a session from the internal map.
void RemoveSession(const std::string& web_session_id);
// Initializes a session with the |init_data_type|, |init_data| and
// |session_type| provided. Takes ownership of |promise|.
void InitializeNewSession(const std::string& init_data_type,
const uint8* init_data,
int init_data_length,
media::MediaKeys::SessionType session_type,
scoped_ptr<media::NewSessionCdmPromise> promise);
// Updates the session specified by |web_session_id| with |response|.
// Takes ownership of |promise|.
void UpdateSession(const std::string& web_session_id,
const uint8* response,
int response_length,
scoped_ptr<media::SimpleCdmPromise> promise);
// Releases the session specified by |web_session_id|.
// Takes ownership of |promise|.
void ReleaseSession(const std::string& web_session_id,
scoped_ptr<media::SimpleCdmPromise> promise);
// 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();
// Returns a prefix to use for UMAs.
const std::string& GetKeySystemUMAPrefix() const;
#if defined(ENABLE_BROWSER_CDMS)
// Returns the CDM ID associated with the |media_keys_|. May be kInvalidCdmId
// if no CDM ID is associated.
int GetCdmId() const;
#endif
private:
friend class base::RefCounted<CdmSessionAdapter>;
typedef base::hash_map<std::string,
base::WeakPtr<WebContentDecryptionModuleSessionImpl> >
SessionMap;
~CdmSessionAdapter();
// Callbacks for firing session events.
void OnSessionMessage(const std::string& web_session_id,
const std::vector<uint8>& message,
const GURL& destination_url);
void OnSessionReady(const std::string& web_session_id);
void OnSessionClosed(const std::string& web_session_id);
void OnSessionError(const std::string& web_session_id,
media::MediaKeys::Exception exception_code,
uint32 system_code,
const std::string& error_message);
// Helper function of the callbacks.
WebContentDecryptionModuleSessionImpl* GetSession(
const std::string& web_session_id);
scoped_ptr<media::MediaKeys> media_keys_;
SessionMap sessions_;
#if defined(ENABLE_BROWSER_CDMS)
int cdm_id_;
#endif
std::string key_system_uma_prefix_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<CdmSessionAdapter> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(CdmSessionAdapter);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_CDM_SESSION_ADAPTER_H_
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