/*
* Internal stream APIs to server part of Transport Layer, declared in
* header tlintern.h. Direct pointers to stream objects are used here as
* these functions are internal.
*/
IMG_UINT32
TLStreamAcquireReadPos(PTL_STREAM psStream, IMG_UINT32* puiReadOffset)
{
IMG_UINT32 uiReadLen = 0;
IMG_UINT32 ui32LRead, ui32LWrite;
PVR_DPF_ENTERED;
PVR_ASSERT(psStream);
PVR_ASSERT(puiReadOffset);
/* Grab a local copy */
ui32LRead = psStream->ui32Read;
ui32LWrite = psStream->ui32Write;
/* No data available and CB defined - try and get data */
if ((ui32LRead == ui32LWrite) && psStream->pfProducerCallback)
{
PVRSRV_ERROR eRc;
IMG_UINT32 ui32Resp = 0;
eRc = ((TL_STREAM_SOURCECB)psStream->pfProducerCallback)(psStream, TL_SOURCECB_OP_CLIENT_EOS,
&ui32Resp, psStream->pvProducerUserData);
PVR_LOG_IF_ERROR(eRc, "TLStream->pfProducerCallback");
ui32LWrite = psStream->ui32Write;
}
/* No data available... */
if (ui32LRead == ui32LWrite)
{
PVR_DPF_RETURN_VAL(0);
}
/* Data is available to read... */
*puiReadOffset = ui32LRead;
/*PVR_DPF((PVR_DBG_VERBOSE,
* "TLStreamAcquireReadPos Start before: Write:%d, Read:%d, size:%d",
* ui32LWrite, ui32LRead, psStream->ui32Size));
*/
if ( ui32LRead > ui32LWrite )
{ /* CB has wrapped around.
* Return the first contiguous piece of memory, ie [ReadLen,EndOfBuffer]
* and let a subsequent AcquireReadPos read the rest of the Buffer */
/*PVR_DPF((PVR_DBG_VERBOSE, "TLStreamAcquireReadPos buffer has wrapped"));*/
uiReadLen = psStream->ui32Size - ui32LRead;
}
else
{ // CB has not wrapped
uiReadLen = ui32LWrite - ui32LRead;
}
PVR_DPF_RETURN_VAL(uiReadLen);
}
PVRSRV_ERROR
TLStreamOpen(IMG_HANDLE *phStream,
IMG_CHAR *szStreamName)
{
PTL_SNODE psTmpSNode;
PVR_DPF_ENTERED;
if ( IMG_NULL == phStream || IMG_NULL == szStreamName )
{
PVR_DPF_RETURN_RC(PVRSRV_ERROR_INVALID_PARAMS);
}
/* Search for a stream node with a matching stream name */
psTmpSNode = TLFindStreamNodeByName(szStreamName);
if ( IMG_NULL == psTmpSNode )
{
PVR_DPF_RETURN_RC(PVRSRV_ERROR_NOT_FOUND);
}
else
{ /* Found a stream to open. lock and increase reference count */
//Thread Safety: Not yet implemented OSLockAcquire(psTmpStream->hLock);
psTmpSNode->psStream->uiRefCount++;
*phStream = (IMG_HANDLE)psTmpSNode->psStream;
//Thread Safety: Not yet implemented OSLockRelease(psTmpStream->hLock);
PVR_DPF_RETURN_VAL(PVRSRV_OK);
}
}
IMG_BOOL TLTryRemoveStreamAndFreeStreamNode(PTL_SNODE psRemove)
{
PVR_DPF_ENTERED;
PVR_ASSERT(psRemove);
/* If there is a client connected to this stream, defer stream's deletion */
if (psRemove->psRDesc != IMG_NULL)
{
PVR_DPF_RETURN_VAL (IMG_FALSE);
}
/* Remove stream from TL_GLOBAL_DATA's list and free stream node */
psRemove->psStream = IMG_NULL;
RemoveAndFreeStreamNode(psRemove);
PVR_DPF_RETURN_VAL (IMG_TRUE);
}
PTL_SNODE TLFindStreamNodeByDesc(PTL_STREAM_DESC psRDesc)
{
TL_GLOBAL_DATA* psGD = TLGGD();
PTL_SNODE psn;
PVR_DPF_ENTERED;
PVR_ASSERT(psRDesc);
for (psn = psGD->psHead; psn; psn=psn->psNext)
{
if (psn->psRDesc == psRDesc)
{
PVR_DPF_RETURN_VAL(psn);
}
}
PVR_DPF_RETURN_VAL(IMG_NULL);
}
DEVMEM_EXPORTCOOKIE*
TLStreamGetBufferCookie(PTL_STREAM psStream)
{
PVR_DPF_ENTERED;
PVR_ASSERT(psStream);
PVR_DPF_RETURN_VAL(&psStream->sExportCookie);
}
PTL_SNODE TLFindStreamNodeByName(IMG_PCHAR pszName)
{
TL_GLOBAL_DATA* psGD = TLGGD();
PTL_SNODE psn;
PVR_DPF_ENTERED;
PVR_ASSERT(pszName);
for (psn = psGD->psHead; psn; psn=psn->psNext)
{
if (psn->psStream && OSStringCompare(psn->psStream->szName, pszName)==0)
{
PVR_DPF_RETURN_VAL(psn);
}
}
PVR_DPF_RETURN_VAL(IMG_NULL);
}
IMG_BOOL
TLStreamEOS(PTL_STREAM psStream)
{
PVR_DPF_ENTERED;
PVR_ASSERT(psStream);
/* If both pointers are equal then the buffer is empty */
PVR_DPF_RETURN_VAL( psStream->ui32Read == psStream->ui32Write );
}
IMG_BOOL TLRemoveDescAndTryFreeStreamNode(PTL_SNODE psRemove)
{
PVR_DPF_ENTERED;
PVR_ASSERT(psRemove);
/* Remove stream descriptor (i.e. stream reader context) */
psRemove->psRDesc = IMG_NULL;
/* Do not Free Stream Node if there is a write reference (a producer context) to the stream */
if (0 != psRemove->uiWRefCount)
{
PVR_DPF_RETURN_VAL (IMG_FALSE);
}
/* Make stream pointer NULL to prevent it from being destroyed in RemoveAndFreeStreamNode
* Cleanup of stream should be done by the calling context */
psRemove->psStream = IMG_NULL;
RemoveAndFreeStreamNode(psRemove);
PVR_DPF_RETURN_VAL (IMG_TRUE);
}
