Oops. The code got cut off. Here's the full routine. -Marc
bool operator()(const uint32_t *items, size_t numItems, const
usrp2::rx_metadata *metadata)
{
if (_numFrames == 0)
{
// The expected time prediction for the second frame is always off by
19 ticks,
// suggesting that the first frame is messed up somehow.
// As a work-around, we just ignore the first frame as if it never
happened.
++_numFrames;
return true;
}
if (_numFrames == 1)
_startingSampleClock32 = metadata->timestamp;
else
{
if (metadata->timestamp != _expectedSampleClock32)
{
++_numTimeErrors;
fprintf (stdout, "Time error in frame %llu. Off by %d ticks.\n",
_numFrames, metadata->timestamp - _expectedSampleClock32);
}
}
++_numFrames;
_expectedSampleClock32 = metadata->timestamp + numItems*_decimation;
size_t numRemaining = _buffer.size() - _numSamples;
size_t numToCopy = std::min(numItems, numRemaining);
memcpy(&_buffer[_numSamples], items, numToCopy*sizeof(_buffer[0]));
_numSamples += numToCopy;
if (_numSamples == _buffer.size())
{
_endingSampleClock32 = metadata->timestamp + numToCopy*_decimation;
return false;
}
return true;
}
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