/*
* This file is part of the libCEC(R) library.
*
- * libCEC(R) is Copyright (C) 2011-2012 Pulse-Eight Limited. All rights reserved.
+ * libCEC(R) is Copyright (C) 2011-2013 Pulse-Eight Limited. All rights reserved.
* libCEC(R) is an original work, containing original code.
*
* libCEC(R) is a trademark of Pulse-Eight Limited.
* http://www.pulse-eight.net/
*/
+#include "env.h"
#include "CECProcessor.h"
-#include "adapter/USBCECAdapterCommunication.h"
+#include "adapter/AdapterFactory.h"
#include "devices/CECBusDevice.h"
#include "devices/CECAudioSystem.h"
#include "devices/CECPlaybackDevice.h"
#include "implementations/CECCommandHandler.h"
#include "LibCEC.h"
#include "CECClient.h"
+#include "CECTypeUtils.h"
#include "platform/util/timeutils.h"
+#include "platform/util/util.h"
using namespace CEC;
using namespace std;
using namespace PLATFORM;
#define CEC_PROCESSOR_SIGNAL_WAIT_TIME 1000
+#define ACTIVE_SOURCE_CHECK_INTERVAL 500
+#define TV_PRESENT_CHECK_INTERVAL 30000
-#define ToString(x) m_libcec->ToString(x)
+#define ToString(x) CCECTypeUtils::ToString(x)
+
+CCECStandbyProtection::CCECStandbyProtection(CCECProcessor* processor) :
+ m_processor(processor) {}
+CCECStandbyProtection::~CCECStandbyProtection(void) {}
+
+void* CCECStandbyProtection::Process(void)
+{
+ int64_t last = GetTimeMs();
+ int64_t next;
+ while (!IsStopped())
+ {
+ PLATFORM::CEvent::Sleep(1000);
+
+ next = GetTimeMs();
+
+ // reset the connection if the clock changed
+ if (next < last || next - last > 10000)
+ {
+ libcec_parameter param;
+ param.paramData = NULL; param.paramType = CEC_PARAMETER_TYPE_UNKOWN;
+ m_processor->GetLib()->Alert(CEC_ALERT_CONNECTION_LOST, param);
+ break;
+ }
+
+ last = next;
+ }
+ return NULL;
+}
CCECProcessor::CCECProcessor(CLibCEC *libcec) :
m_bInitialised(false),
m_libcec(libcec),
m_iStandardLineTimeout(3),
m_iRetryLineTimeout(3),
- m_iLastTransmission(0)
+ m_iLastTransmission(0),
+ m_bMonitor(true),
+ m_addrAllocator(NULL),
+ m_bStallCommunication(false),
+ m_connCheck(NULL)
{
m_busDevices = new CCECDeviceMap(this);
}
CCECProcessor::~CCECProcessor(void)
{
+ m_bStallCommunication = false;
+ DELETE_AND_NULL(m_addrAllocator);
Close();
- delete m_busDevices;
+ DELETE_AND_NULL(m_busDevices);
}
bool CCECProcessor::Start(const char *strPort, uint16_t iBaudRate /* = CEC_SERIAL_DEFAULT_BAUDRATE */, uint32_t iTimeoutMs /* = CEC_DEFAULT_CONNECT_TIMEOUT */)
SetCECInitialised(false);
// stop the processor
+ DELETE_AND_NULL(m_connCheck);
+ StopThread(-1);
+ m_inBuffer.Broadcast();
StopThread();
// close the connection
- if (m_communication)
- {
- delete m_communication;
- m_communication = NULL;
- }
+ DELETE_AND_NULL(m_communication);
}
void CCECProcessor::ResetMembers(void)
{
// close the connection
- if (m_communication)
- {
- delete m_communication;
- m_communication = NULL;
- }
+ DELETE_AND_NULL(m_communication);
// reset the other members to the initial state
m_iStandardLineTimeout = 3;
}
// create a new connection
- m_communication = new CUSBCECAdapterCommunication(this, strPort, iBaudRate);
+ m_communication = CAdapterFactory(this->m_libcec).GetInstance(strPort, iBaudRate);
// open a new connection
unsigned iConnectTry(0);
m_libcec->AddLog(CEC_LOG_NOTICE, "connection opened");
- // always start by setting the ackmask to 0, to clear previous values
- SetAckMask(0);
-
// mark as initialised
SetCECInitialised(true);
UnregisterClients();
}
-bool CCECProcessor::TryLogicalAddress(cec_logical_address address)
+bool CCECProcessor::TryLogicalAddress(cec_logical_address address, cec_version libCECSpecVersion /* = CEC_VERSION_1_4 */)
{
// find the device
CCECBusDevice *device = m_busDevices->At(address);
return false;
// poll the LA if not
- SetAckMask(0);
- return device->TryLogicalAddress();
+ return device->TryLogicalAddress(libCECSpecVersion);
}
return false;
{
m_libcec->AddLog(CEC_LOG_DEBUG, "processor thread started");
- cec_command command;
+ if (!m_connCheck)
+ m_connCheck = new CCECStandbyProtection(this);
+ m_connCheck->CreateThread();
+
+ cec_command command; command.Clear();
+ CTimeout activeSourceCheck(ACTIVE_SOURCE_CHECK_INTERVAL);
+ CTimeout tvPresentCheck(TV_PRESENT_CHECK_INTERVAL);
// as long as we're not being stopped and the connection is open
while (!IsStopped() && m_communication->IsOpen())
if (m_inBuffer.Pop(command, CEC_PROCESSOR_SIGNAL_WAIT_TIME))
ProcessCommand(command);
- if (CECInitialised())
+ if (CECInitialised() && !IsStopped())
{
// check clients for keypress timeouts
m_libcec->CheckKeypressTimeout();
// check if we need to replace handlers
ReplaceHandlers();
+
+ // check whether we need to activate a source, if it failed before
+ if (activeSourceCheck.TimeLeft() == 0)
+ {
+ if (CECInitialised())
+ TransmitPendingActiveSourceCommands();
+ activeSourceCheck.Init(ACTIVE_SOURCE_CHECK_INTERVAL);
+ }
+
+ // check whether the TV is present and responding
+ if (tvPresentCheck.TimeLeft() == 0)
+ {
+ CCECClient *primary = GetPrimaryClient();
+ // only check whether the tv responds to polls when a client is connected and not in monitoring mode
+ if (primary && primary->GetConfiguration()->bMonitorOnly != 1)
+ {
+ if (!m_busDevices->At(CECDEVICE_TV)->IsPresent())
+ {
+ libcec_parameter param;
+ param.paramType = CEC_PARAMETER_TYPE_STRING;
+ param.paramData = (void*)"TV does not respond to CEC polls";
+ primary->Alert(CEC_ALERT_TV_POLL_FAILED, param);
+ }
+ }
+ tvPresentCheck.Init(TV_PRESENT_CHECK_INTERVAL);
+ }
}
}
return bReturn;
}
+void CCECProcessor::SetActiveSource(bool bSetTo, bool bClientUnregistered)
+{
+ if (m_communication)
+ m_communication->SetActiveSource(bSetTo, bClientUnregistered);
+}
+
void CCECProcessor::SetStandardLineTimeout(uint8_t iTimeout)
{
CLockObject lock(m_mutex);
CCECBusDevice *primary = GetPrimaryDevice();
// poll the destination, with the primary as source
if (primary)
- return primary->TransmitPoll(iAddress);
+ return primary->TransmitPoll(iAddress, true);
- // try to find the destination
- CCECBusDevice *device = m_busDevices->At(iAddress);
- // and poll the destination, with the same LA as source
+ CCECBusDevice *device = m_busDevices->At(CECDEVICE_UNREGISTERED);
if (device)
- return device->TransmitPoll(iAddress);
+ return device->TransmitPoll(iAddress, true);
return false;
}
return device && device->IsActiveSource();
}
-bool CCECProcessor::Transmit(const cec_command &data)
+bool CCECProcessor::Transmit(const cec_command &data, bool bIsReply)
{
+ cec_command transmitData(data);
uint8_t iMaxTries(0);
bool bRetry(true);
uint8_t iTries(0);
// reset the state of this message to 'unknown'
cec_adapter_message_state adapterState = ADAPTER_MESSAGE_STATE_UNKNOWN;
- LogOutput(data);
+ if (!m_communication->SupportsSourceLogicalAddress(transmitData.initiator))
+ {
+ if (transmitData.initiator == CECDEVICE_UNREGISTERED && m_communication->SupportsSourceLogicalAddress(CECDEVICE_FREEUSE))
+ {
+ m_libcec->AddLog(CEC_LOG_DEBUG, "initiator '%s' is not supported by the CEC adapter. using '%s' instead", ToString(transmitData.initiator), ToString(CECDEVICE_FREEUSE));
+ transmitData.initiator = CECDEVICE_FREEUSE;
+ }
+ else
+ {
+ m_libcec->AddLog(CEC_LOG_DEBUG, "initiator '%s' is not supported by the CEC adapter", ToString(transmitData.initiator));
+ return false;
+ }
+ }
+
+ LogOutput(transmitData);
// find the initiator device
- CCECBusDevice *initiator = m_busDevices->At(data.initiator);
+ CCECBusDevice *initiator = m_busDevices->At(transmitData.initiator);
if (!initiator)
{
m_libcec->AddLog(CEC_LOG_WARNING, "invalid initiator");
}
// find the destination device, if it's not the broadcast address
- if (data.destination != CECDEVICE_BROADCAST)
+ if (transmitData.destination != CECDEVICE_BROADCAST)
{
// check if the device is marked as handled by libCEC
- CCECBusDevice *destination = m_busDevices->At(data.destination);
+ CCECBusDevice *destination = m_busDevices->At(transmitData.destination);
if (destination && destination->IsHandledByLibCEC())
{
// and reject the command if it's trying to send data to a device that is handled by libCEC
}
}
+ // wait until we finished allocating a new LA if it got lost
+ while (m_bStallCommunication) Sleep(5);
+
{
CLockObject lock(m_mutex);
m_iLastTransmission = GetTimeMs();
// set the number of tries
iMaxTries = initiator->GetHandler()->GetTransmitRetries() + 1;
+ initiator->MarkHandlerReady();
}
// and try to send the command
while (bRetry && ++iTries < iMaxTries)
{
- if (initiator->IsUnsupportedFeature(data.opcode))
+ if (initiator->IsUnsupportedFeature(transmitData.opcode))
return false;
adapterState = !IsStopped() && m_communication && m_communication->IsOpen() ?
- m_communication->Write(data, bRetry, iLineTimeout) :
+ m_communication->Write(transmitData, bRetry, iLineTimeout, bIsReply) :
ADAPTER_MESSAGE_STATE_ERROR;
iLineTimeout = m_iRetryLineTimeout;
}
- return adapterState == ADAPTER_MESSAGE_STATE_SENT_ACKED;
+ return bIsReply ?
+ adapterState == ADAPTER_MESSAGE_STATE_SENT_ACKED || adapterState == ADAPTER_MESSAGE_STATE_SENT || adapterState == ADAPTER_MESSAGE_STATE_WAITING_TO_BE_SENT :
+ adapterState == ADAPTER_MESSAGE_STATE_SENT_ACKED;
}
void CCECProcessor::TransmitAbort(cec_logical_address source, cec_logical_address destination, cec_opcode opcode, cec_abort_reason reason /* = CEC_ABORT_REASON_UNRECOGNIZED_OPCODE */)
command.parameters.PushBack((uint8_t)opcode);
command.parameters.PushBack((uint8_t)reason);
- Transmit(command);
+ Transmit(command, true);
}
void CCECProcessor::ProcessCommand(const cec_command &command)
{
// log the command
- CStdString dataStr;
- dataStr.Format(">> %1x%1x", command.initiator, command.destination);
- if (command.opcode_set == 1)
- dataStr.AppendFormat(":%02x", command.opcode);
- for (uint8_t iPtr = 0; iPtr < command.parameters.size; iPtr++)
- dataStr.AppendFormat(":%02x", (unsigned int)command.parameters[iPtr]);
- m_libcec->AddLog(CEC_LOG_TRAFFIC, dataStr.c_str());
+ m_libcec->AddLog(CEC_LOG_TRAFFIC, ToString(command).c_str());
// find the initiator
CCECBusDevice *device = m_busDevices->At(command.initiator);
return m_communication ? m_communication->GetPhysicalAddress() : CEC_INVALID_PHYSICAL_ADDRESS;
}
-bool CCECProcessor::SetAckMask(uint16_t iMask)
+bool CCECProcessor::ClearLogicalAddresses(void)
{
- return m_communication ? m_communication->SetAckMask(iMask) : false;
+ cec_logical_addresses addresses; addresses.Clear();
+ return SetLogicalAddresses(addresses);
+}
+
+bool CCECProcessor::SetLogicalAddresses(const cec_logical_addresses &addresses)
+{
+ return m_communication ? m_communication->SetLogicalAddresses(addresses) : false;
}
bool CCECProcessor::StandbyDevices(const cec_logical_address initiator, const CECDEVICEVEC &devices)
// open a connection if no connection has been opened
if (!m_communication && strPort)
{
- IAdapterCommunication *comm = new CUSBCECAdapterCommunication(this, strPort);
+ CAdapterFactory factory(this->m_libcec);
+ IAdapterCommunication *comm = factory.GetInstance(strPort);
CTimeout timeout(CEC_DEFAULT_CONNECT_TIMEOUT);
int iConnectTry(0);
while (timeout.TimeLeft() > 0 && (bReturn = comm->Open(timeout.TimeLeft() / CEC_CONNECT_TRIES, true)) == false)
if (comm->IsOpen())
{
bReturn = comm->StartBootloader();
- delete comm;
+ DELETE_AND_NULL(comm);
}
return bReturn;
}
return !device || !device->HandleReceiveFailed();
}
-bool CCECProcessor::SetStreamPath(uint16_t iPhysicalAddress)
-{
- // stream path changes are sent by the TV
- return GetTV()->GetHandler()->TransmitSetStreamPath(iPhysicalAddress);
-}
-
bool CCECProcessor::CanPersistConfiguration(void)
{
return m_communication ? m_communication->GetFirmwareVersion() >= 2 : false;
bool CCECProcessor::PersistConfiguration(const libcec_configuration &configuration)
{
- return m_communication ? m_communication->PersistConfiguration(configuration) : false;
+ libcec_configuration persistConfiguration = configuration;
+ if (!CLibCEC::IsValidPhysicalAddress(configuration.iPhysicalAddress))
+ {
+ CCECBusDevice *device = GetPrimaryDevice();
+ if (device)
+ persistConfiguration.iPhysicalAddress = device->GetCurrentPhysicalAddress();
+ }
+
+ return m_communication ? m_communication->PersistConfiguration(persistConfiguration) : false;
}
void CCECProcessor::RescanActiveDevices(void)
config->iFirmwareVersion = m_communication->GetFirmwareVersion();
config->iPhysicalAddress = m_communication->GetPhysicalAddress();
config->iFirmwareBuildDate = m_communication->GetFirmwareBuildDate();
+ config->adapterType = m_communication->GetAdapterType();
+
+ Close();
return true;
}
return CCECBusDevice::AsTuner(m_busDevices->At(address));
}
+bool CCECProcessor::AllocateLogicalAddresses(CCECClient* client)
+{
+ libcec_configuration &configuration = *client->GetConfiguration();
+
+ // mark as unregistered
+ client->SetRegistered(false);
+
+ // unregister this client from the old addresses
+ CECDEVICEVEC devices;
+ m_busDevices->GetByLogicalAddresses(devices, configuration.logicalAddresses);
+ for (CECDEVICEVEC::const_iterator it = devices.begin(); it != devices.end(); it++)
+ {
+ // remove client entry
+ CLockObject lock(m_mutex);
+ m_clients.erase((*it)->GetLogicalAddress());
+ }
+
+ // find logical addresses for this client
+ if (!client->AllocateLogicalAddresses())
+ {
+ m_libcec->AddLog(CEC_LOG_ERROR, "failed to find a free logical address for the client");
+ return false;
+ }
+
+ // register this client on the new addresses
+ devices.clear();
+ m_busDevices->GetByLogicalAddresses(devices, configuration.logicalAddresses);
+ for (CECDEVICEVEC::const_iterator it = devices.begin(); it != devices.end(); it++)
+ {
+ // set the physical address of the device at this LA
+ if (CLibCEC::IsValidPhysicalAddress(configuration.iPhysicalAddress))
+ (*it)->SetPhysicalAddress(configuration.iPhysicalAddress);
+
+ // replace a previous client
+ CLockObject lock(m_mutex);
+ m_clients.erase((*it)->GetLogicalAddress());
+ m_clients.insert(make_pair((*it)->GetLogicalAddress(), client));
+ }
+
+ // set the new ackmask
+ SetLogicalAddresses(GetLogicalAddresses());
+
+ // resume outgoing communication
+ m_bStallCommunication = false;
+
+ return true;
+}
+
+uint16_t CCECProcessor::GetPhysicalAddressFromEeprom(void)
+{
+ libcec_configuration config; config.Clear();
+ if (m_communication)
+ m_communication->GetConfiguration(config);
+ return config.iPhysicalAddress;
+}
+
bool CCECProcessor::RegisterClient(CCECClient *client)
{
if (!client)
libcec_configuration &configuration = *client->GetConfiguration();
- if (configuration.clientVersion >= CEC_CLIENT_VERSION_1_6_3 && configuration.bMonitorOnly == 1)
+ if (configuration.clientVersion < CEC_CLIENT_VERSION_2_0_0)
+ {
+ m_libcec->AddLog(CEC_LOG_ERROR, "failed to register a new CEC client: client version %s is no longer supported", ToString((cec_client_version)configuration.clientVersion));
+ return false;
+ }
+
+ if (configuration.bMonitorOnly == 1)
return true;
if (!CECInitialised())
if (client->IsRegistered())
UnregisterClient(client);
+ // ensure that controlled mode is enabled
+ m_communication->SetControlledMode(true);
+ m_bMonitor = false;
+
+ // source logical address for requests
+ cec_logical_address sourceAddress(CECDEVICE_UNREGISTERED);
+ if (!m_communication->SupportsSourceLogicalAddress(CECDEVICE_UNREGISTERED))
+ {
+ if (m_communication->SupportsSourceLogicalAddress(CECDEVICE_FREEUSE))
+ sourceAddress = CECDEVICE_FREEUSE;
+ else
+ {
+ m_libcec->AddLog(CEC_LOG_ERROR, "failed to register a new CEC client: both unregistered and free use are not supported by the device");
+ return false;
+ }
+ }
+
+ // ensure that we know the vendor id of the TV
+ CCECBusDevice *tv = GetTV();
+ cec_vendor_id tvVendor(tv->GetVendorId(sourceAddress));
+
+ // wait until the handler is replaced, to avoid double registrations
+ if (tvVendor != CEC_VENDOR_UNKNOWN &&
+ CCECCommandHandler::HasSpecificHandler(tvVendor))
+ {
+ while (!tv->ReplaceHandler(false))
+ CEvent::Sleep(5);
+ }
+
// get the configuration from the client
m_libcec->AddLog(CEC_LOG_NOTICE, "registering new CEC client - v%s", ToString((cec_client_version)configuration.clientVersion));
- // mark as uninitialised and unregistered
- client->SetRegistered(false);
- client->SetInitialised(false);
-
// get the current ackmask, so we can restore it if polling fails
- uint16_t iPreviousMask(m_communication->GetAckMask());
+ cec_logical_addresses previousMask = GetLogicalAddresses();
+
+ // mark as uninitialised
+ client->SetInitialised(false);
// find logical addresses for this client
- if (!client->AllocateLogicalAddresses())
+ if (!AllocateLogicalAddresses(client))
{
m_libcec->AddLog(CEC_LOG_ERROR, "failed to register the new CEC client - cannot allocate the requested device types");
- SetAckMask(iPreviousMask);
+ SetLogicalAddresses(previousMask);
return false;
}
- // register this client on the new addresses
- CECDEVICEVEC devices;
- m_busDevices->GetByLogicalAddresses(devices, configuration.logicalAddresses);
- for (CECDEVICEVEC::const_iterator it = devices.begin(); it != devices.end(); it++)
- {
- // replace a previous client
- CLockObject lock(m_mutex);
- m_clients.erase((*it)->GetLogicalAddress());
- m_clients.insert(make_pair<cec_logical_address, CCECClient *>((*it)->GetLogicalAddress(), client));
- }
-
// get the settings from the rom
if (configuration.bGetSettingsFromROM == 1)
{
- libcec_configuration config;
+ libcec_configuration config; config.Clear();
m_communication->GetConfiguration(config);
CLockObject lock(m_mutex);
configuration.serverVersion = LIBCEC_VERSION_CURRENT;
configuration.iFirmwareVersion = m_communication->GetFirmwareVersion();
configuration.iFirmwareBuildDate = m_communication->GetFirmwareBuildDate();
+ configuration.adapterType = m_communication->GetAdapterType();
// mark the client as registered
client->SetRegistered(true);
- // set the new ack mask
- bool bReturn = SetAckMask(GetLogicalAddresses().AckMask()) &&
- // and initialise the client
- client->OnRegister();
+ sourceAddress = client->GetPrimaryLogicalAdddress();
+
+ // initialise the client
+ bool bReturn = client->OnRegister();
// log the new registration
CStdString strLog;
client->Alert(CEC_ALERT_SERVICE_DEVICE, param);
}
+ // ensure that the command handler for the TV is initialised
+ if (bReturn)
+ {
+ CCECCommandHandler *handler = GetTV()->GetHandler();
+ if (handler)
+ handler->InitHandler();
+ GetTV()->MarkHandlerReady();
+ }
+
+ // report our OSD name to the TV, since some TVs don't request it
+ client->GetPrimaryDevice()->TransmitOSDName(CECDEVICE_TV, false);
+
+ // request the power status of the TV
+ tv->RequestPowerStatus(sourceAddress, true, true);
+
return bReturn;
}
m_clients.erase(entry);
// reset the device status
- (*it)->ResetDeviceStatus();
+ (*it)->ResetDeviceStatus(true);
}
}
// set the new ackmask
- return SetAckMask(GetLogicalAddresses().AckMask());
+ cec_logical_addresses addresses = GetLogicalAddresses();
+ if (SetLogicalAddresses(addresses))
+ {
+ // no more clients left, disable controlled mode
+ if (addresses.IsEmpty() && !m_bMonitor)
+ m_communication->SetControlledMode(false);
+
+ return true;
+ }
+
+ return false;
}
void CCECProcessor::UnregisterClients(void)
{
- m_libcec->AddLog(CEC_LOG_NOTICE, "unregistering all CEC clients");
+ m_libcec->AddLog(CEC_LOG_DEBUG, "unregistering all CEC clients");
vector<CCECClient *> clients = m_libcec->GetClients();
for (vector<CCECClient *>::iterator client = clients.begin(); client != clients.end(); client++)
m_communication->IsRunningLatestFirmware() :
true;
}
+
+void CCECProcessor::SwitchMonitoring(bool bSwitchTo)
+{
+ {
+ CLockObject lock(m_mutex);
+ m_bMonitor = bSwitchTo;
+ }
+ if (bSwitchTo)
+ UnregisterClients();
+}
+
+void CCECProcessor::HandleLogicalAddressLost(cec_logical_address oldAddress)
+{
+ // stall outgoing messages until we know our new LA
+ m_bStallCommunication = true;
+
+ m_libcec->AddLog(CEC_LOG_NOTICE, "logical address %x was taken by another device, allocating a new address", oldAddress);
+ CCECClient* client = GetClient(oldAddress);
+ if (!client)
+ client = GetPrimaryClient();
+ if (client)
+ {
+ if (m_addrAllocator)
+ while (m_addrAllocator->IsRunning()) Sleep(5);
+ delete m_addrAllocator;
+
+ m_addrAllocator = new CCECAllocateLogicalAddress(this, client);
+ m_addrAllocator->CreateThread();
+ }
+}
+
+void CCECProcessor::HandlePhysicalAddressChanged(uint16_t iNewAddress)
+{
+ m_libcec->AddLog(CEC_LOG_NOTICE, "physical address changed to %04x", iNewAddress);
+ CCECClient* client = GetPrimaryClient();
+ if (client)
+ client->SetPhysicalAddress(iNewAddress);
+}
+
+uint16_t CCECProcessor::GetAdapterVendorId(void) const
+{
+ return m_communication ? m_communication->GetAdapterVendorId() : 0;
+}
+
+uint16_t CCECProcessor::GetAdapterProductId(void) const
+{
+ return m_communication ? m_communication->GetAdapterProductId() : 0;
+}
+
+CCECAllocateLogicalAddress::CCECAllocateLogicalAddress(CCECProcessor* processor, CCECClient* client) :
+ m_processor(processor),
+ m_client(client) { }
+
+void* CCECAllocateLogicalAddress::Process(void)
+{
+ m_processor->AllocateLogicalAddresses(m_client);
+ return NULL;
+}
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