bool AREngine::initHardware(IOService* inProvider)
{
bool theAnswer = false;
if(IOAudioEngine::initHardware(inProvider))
{
IOAudioSampleRate theInitialSampleRate = { 0, 0 };
UInt32 theNumberChannels = 0;
// create the streams
if(CreateStreams(&theInitialSampleRate, &theNumberChannels) && (theInitialSampleRate.whole != 0))
{
CreateControls(theNumberChannels);
// figure out how long each block is in microseconds
mBlockTimeoutMicroseconds = 1000000 * mBlockSize / theInitialSampleRate.whole;
setSampleRate(&theInitialSampleRate);
// Set the number of sample frames in each buffer
setNumSampleFramesPerBuffer(mBlockSize * mNumberBlocks);
// set up the timer
IOWorkLoop* theWorkLoop = getWorkLoop();
if(theWorkLoop != NULL)
{
mTimerEventSource = IOTimerEventSource::timerEventSource(this, TimerFired);
if(mTimerEventSource != NULL)
{
theWorkLoop->addEventSource(mTimerEventSource);
theAnswer = true;
}
}
// set the safety offset
// note that due to cache issues, it probably isn't wise to leave the safety offset at 0,
// we set it to 4 here, just to be safe.
setSampleOffset(4);
// set up the time stamp generator
mTimeStampGenerator.SetSampleRate(theInitialSampleRate.whole);
mTimeStampGenerator.SetFramesPerRingBuffer(mBlockSize * mNumberBlocks);
// nate that the rate scalar is a 4.28 fixed point number
// this means that each incremnt is 1/2^28
mTimeStampGenerator.SetRateScalar(1UL << 28);
// set the maximum jitter
// AbsoluteTime theMaximumJitter = { 0, 0 };
// nanoseconds_to_absolutetime(5ULL * 1000ULL, &theMaximumJitter);
// mTimeStampGenerator.SetMaximumJitter(theMaximumJitter.lo);
}
}
return theAnswer;
}
XnStatus XnDeviceBase::Init(const XnDeviceConfig* pDeviceConfig)
{
XnStatus nRetVal = XN_STATUS_OK;
// first init the device
nRetVal = InitImpl(pDeviceConfig);
XN_IS_STATUS_OK(nRetVal);
// and now create streams
if (pDeviceConfig->pInitialValues != NULL)
{
nRetVal = CreateStreams(pDeviceConfig->pInitialValues);
XN_IS_STATUS_OK(nRetVal);
}
return (XN_STATUS_OK);
}
XnStatus XnDeviceFileReader::Rewind()
{
XnStatus nRetVal = XN_STATUS_OK;
// go back to start of stream
nRetVal = GetIOStream()->Seek(XN_DEVICE_FILE_MAGIC_LEN);
XN_IS_STATUS_OK(nRetVal);
// read initial state
XN_PROPERTY_SET_CREATE_ON_STACK(state);
nRetVal = ReadInitialState(&state);
XN_IS_STATUS_OK(nRetVal);
// first handle current streams. remove or reset them
XnDeviceModuleHolderList streams;
nRetVal = GetStreamsList(streams);
XN_IS_STATUS_OK(nRetVal);
for (XnDeviceModuleHolderList::Iterator it = streams.Begin(); it != streams.End(); ++it)
{
XnDeviceModuleHolder* pHolder = *it;
if (m_bStreamsCollectionChanged)
{
// we need to destroy all streams, and recreate them later
nRetVal = DestroyStream(pHolder->GetModule()->GetName());
XN_IS_STATUS_OK(nRetVal);
}
else
{
// just reset frame ID
XnStreamReaderStream* pStream = (XnStreamReaderStream*)pHolder->GetModule();
pStream->Reset();
}
}
// if we need, recreate streams
if (m_bStreamsCollectionChanged)
{
nRetVal = CreateStreams(&state);
XN_IS_STATUS_OK(nRetVal);
}
// now set state.
for (XnPropertySetData::Iterator it = state.pData->Begin(); it != state.pData->End(); ++it)
{
const XnChar* strName = it->Key();
XnActualPropertiesHash* pHash = it->Value();
// fix it first
if (strcmp(strName, XN_MODULE_NAME_DEVICE) == 0)
{
pHash->Remove(XN_MODULE_PROPERTY_READ_WRITE_MODE);
pHash->Remove(XN_MODULE_PROPERTY_PRIMARY_STREAM);
}
XnDeviceModule* pModule;
nRetVal = FindModule(strName, &pModule);
XN_IS_STATUS_OK(nRetVal);
nRetVal = pModule->UnsafeBatchConfig(*pHash);
XN_IS_STATUS_OK(nRetVal);
}
ResetLastTimestampAndFrame();
m_nReferenceTimestamp = 0;
m_nReferenceTime = 0;
m_bStreamsCollectionChanged = FALSE;
return (XN_STATUS_OK);
}
