} /* FrameBytesOffsetsUpdateThreadTerminate */
private void UpdateFrameByteOffsets()
{
updateFrameByteOffsetsRunning = true;
long lastByteOffset = 0;
int lastScanLineRow = 0;
int scanLinesPerSec = 25000;
while ((!eofReached) && (!updateFrameByteOffsetsTerminate))
{
BlockStart();
int loopCount = 0;
f.BaseStream.Seek(frameByteOffsets[largestKnowmFrameNum], SeekOrigin.Begin);
byteOffsetNextRead = frameByteOffsets[largestKnowmFrameNum];
lastScanLineNum = largestKnowmFrameNum * ScanLinesPerFrame - 1;
eof = false;
while ((!eofReached) && (!updateFrameByteOffsetsTerminate) && (loopCount < 50) && (blockedCount < 1))
{
//int linesRead = 0;
int linesRead = 1;
SkipNextScanLine();
while ((linesRead < ScanLinesPerFrame) && (!eof))
{
lastScanLineNum++;
linesRead++;
SkipNextScanLine();
}
if (eof)
{
eofReached = true;
eof = false;
if (linesRead < 1)
{
largestKnowmFrameNum--;
f.BaseStream.Seek(frameByteOffsets[largestKnowmFrameNum], SeekOrigin.Begin);
}
else
{
try { f.BaseStream.Seek(frameByteOffsets[largestKnowmFrameNum], SeekOrigin.Begin); }
catch (Exception)
{
largestKnowmFrameNum--;
f.BaseStream.Seek(frameByteOffsets[largestKnowmFrameNum], SeekOrigin.Begin);
}
}
byteOffsetNextRead = frameByteOffsets[largestKnowmFrameNum];
lastScanLineNum = largestKnowmFrameNum * ScanLinesPerFrame - 1;
}
else
{
largestKnowmFrameNum++;
while (largestKnowmFrameNum >= frameByteOffsets.Length)
{
ExpeandFrameByteOffsets();
}
frameByteOffsets[largestKnowmFrameNum] = byteOffsetNextRead;
frameNumLastRead = largestKnowmFrameNum;
frameNumNextRead = largestKnowmFrameNum + 1;
if ((instrumentDataManager != null) && (history != null))
{
InstrumentData dataRowForFrame = new InstrumentData(instrumentDataManager.CurrentDataRow());
int frameNumPrev = largestKnowmFrameNum - RecordingRateNumSamplingFrames;
if (frameNumPrev < 0)
{
frameNumPrev = 0;
}
int scanLineRow = largestKnowmFrameNum * ScanLinesPerFrame;
int scanLineRowPrev = frameNumPrev * ScanLinesPerFrame;
int scanLinesDelta = scanLineRow - scanLineRowPrev + 1;
long byteOffset = frameByteOffsets[largestKnowmFrameNum];
long byteOffsetPrev = frameByteOffsets[frameNumPrev];
long byteOffsetDelta = byteOffset - byteOffsetPrev + 1;
double secsDelta = (double)scanLinesDelta / (double)scanLinesPerSec;
double bytesDeltaMega = (double)byteOffsetDelta / 1000000.0;
double megPerSec = bytesDeltaMega / secsDelta;
dataRowForFrame.RecordingRate = (float)megPerSec;
lastScanLineRow = scanLineRow;
lastByteOffset = byteOffset;
dataRowForFrame.Time = dataRowForFrame.CTDdate();
history.Add(dataRowForFrame);
}
}
loopCount++;
}
if (lastScanLineNum > largestKnownScanLine)
{
largestKnownScanLine = lastScanLineNum;
}
BlockEnd();
Thread.Sleep(10);
}
updateFrameByteOffsetsRunning = false;
} /* UpdateFrameByteOffsetsForFrameNum */
