void FileStreamerThread::processQuit(volatile Request *request)
{
NOT_NULL(request);
ExitChain::quit();
Gate *gate = request->gate;
delete request;
gate->open();
}
void FileStreamerThread::processRead(volatile Request *request)
{
NOT_NULL(request);
// shortcut to the file
OsFile *osFile = request->osFile;
// seek to the requested offset
osFile->seek(request->offset);
// read the data
if (request->bytesToBeRead > cms_maxReadSize)
{
// only read up to FileStreamerThread::cms_maxReadSize, then resubmit smaller request
const int amountRead = osFile->read(request->buffer, cms_maxReadSize);
request->offset += amountRead;
request->bytesRead += amountRead;
request->bytesToBeRead -= amountRead;
request->buffer = reinterpret_cast<byte *>(request->buffer) + amountRead;
// if we read less than we could have, we're done
if (amountRead < cms_maxReadSize)
{
// store final number of bytes read in storage accessible to main thread
*request->returnValue = static_cast<int>(request->bytesRead);
Gate *gate = request->gate;
delete request;
//set event so other main thread continues
gate->open();
}
else
{
// resubmit request (put it on the head so we get it back first)
if (request->priority == AbstractFile::PriorityAudioVideo)
{
ms_queueCriticalSection.enter();
if (ms_firstAudioVideoRequest)
{
request->next = ms_firstAudioVideoRequest;
ms_firstAudioVideoRequest = request;
}
else
{
ms_firstAudioVideoRequest = request;
ms_lastAudioVideoRequest = request;
}
ms_queueCriticalSection.leave();
}
else
if (request->priority == AbstractFile::PriorityData)
{
ms_queueCriticalSection.enter();
if (ms_firstDataRequest)
{
request->next = ms_firstDataRequest;
ms_firstDataRequest = request;
}
else
{
ms_firstDataRequest = request;
ms_lastDataRequest = request;
}
ms_queueCriticalSection.leave();
}
else
if (request->priority == AbstractFile::PriorityLow)
{
ms_queueCriticalSection.enter();
if (ms_firstLowRequest)
{
request->next = ms_firstLowRequest;
ms_firstLowRequest = request;
}
else
{
ms_firstLowRequest = request;
ms_lastLowRequest = request;
}
ms_queueCriticalSection.leave();
}
else
DEBUG_FATAL(true, ("FileStreamerThread::processRead request has unknown priority type"));
// signal the file thread that a new request is waiting
ms_eventsPending.signal();
}
}
else
{
// fulfill entire read request
const int amountRead = osFile->read(request->buffer, request->bytesToBeRead);
request->bytesRead += amountRead;
request->bytesToBeRead -= amountRead;
// store final number of bytes read in storage accessible to main thread
*request->returnValue = static_cast<int>(request->bytesRead);
Gate *gate = request->gate;
delete request;
gate->open();
}
}
