private void FillBuffer()
{
// load the indices from the database
indexCount = 0;
currentIndex = 0;
bool continuousData;
bool streamOutOfData = DatabaseUtility.LoadIndices(indices, endingTick + 1, streamID, frame.Buffer.Length,
out indexCount, out minOffset, out maxOffset, out continuousData);
//Debug.WriteLine("FillBuffer for StreamID=" + streamID.ToString() + "; starting tick=" + (endingTick + 1).ToString());
// load the associated buffer from the database if we're not empty....
if (indexCount > 0)
{
/// Note on data quirks: Sometimes the raw data from the archive service is out of order.
/// I think this is a bug in Archive Service. The indices are in order by timestamp, but the start/end fields may not
/// align one after another. In this case there are also corresponding discontinuities in the raw data.
/// To work around this we have LoadIndices keep track of the minimum start and the maximum end in the
/// indices we've just fetched. They are not necessarily the first and last items in the array.
/// We also add a check to make sure we don't try to fetch more data than the frame buffer can
/// hold.
if (!continuousData)
{
DateTime dt = new DateTime(this.endingTick + 1);
Console.WriteLine("DBStreamPlayer.FillBuffer: A data discontinuity was found for streamID=" + streamID.ToString() + ";near time=" + dt.ToString());
}
this.startingTick = indices[0].timestamp;
this.endingTick = indices[indexCount - 1].timestamp;
DatabaseUtility.LoadBuffer(streamID, minOffset, maxOffset, ref frame);
}
else
{
streamEndReached = true;
}
}
