OniStatus Context::waitForStreams(OniStreamHandle* pStreams, int streamCount, int* pStreamIndex, int timeout)
{
static const int MAX_WAITED_DEVICES = 20;
Device* deviceList[MAX_WAITED_DEVICES];
unsigned long long oldestTimestamp = XN_MAX_UINT64;
int oldestIndex = -1;
int numDevices = 0;
for (int i = 0; i < streamCount; ++i)
{
if (pStreams[i] != NULL)
{
VideoStream* pStream = ((_OniStream*)pStreams[i])->pStream;
Device* pDevice = &pStream->getDevice();
// Check if device already exists.
bool found = false;
for (int j = 0; j < numDevices; ++j)
{
if (deviceList[j] == pDevice)
{
found = true;
break;
}
}
// Add new device to list.
if (!found)
{
if (numDevices < MAX_WAITED_DEVICES)
{
deviceList[numDevices] = pDevice;
++numDevices;
}
else
{
// Cannot wait on streams from more than MAX_WAITED_DEVICES devices.
return ONI_STATUS_NOT_SUPPORTED;
}
}
}
}
do
{
for (int i = 0; i < streamCount; ++i)
{
if (pStreams[i] == NULL)
continue;
VideoStream* pStream = ((_OniStream*)pStreams[i])->pStream;
pStream->lockFrame();
OniFrame* pFrame = pStream->peekFrame();
if (pFrame != NULL && pFrame->timestamp < oldestTimestamp)
{
oldestTimestamp = pFrame->timestamp;
oldestIndex = i;
}
pStream->unlockFrame();
}
if (oldestIndex != -1)
{
*pStreamIndex = oldestIndex;
return ONI_STATUS_OK;
}
// 'Poke' the driver to attempt to receive more frames.
for (int j = 0; j < numDevices; ++j)
{
deviceList[j]->tryManualTrigger();
}
} while (m_newFrameAvailableEvent.Wait(timeout) == XN_STATUS_OK);
m_errorLogger.Append("waitForStreams: timeout reached");
return ONI_STATUS_TIME_OUT;
}
