Re: [Discuss-gnuradio] MIMO cable and timestamps (raw ethernet)

[Marc Epard]

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;

}