private void ScanPreviewBuffer()
{
if (!IsAnalyzing)
{
return;
}
if (_photoCamera == null)
{
return;
}
if (!_initialized)
{
return;
}
// Don't scan too frequently
// Check the minimum time between frames
// as well as the min time between continuous scans
var msSinceLastPreview = (DateTime.UtcNow - _lastAnalysis).TotalMilliseconds;
if ((DateTime.UtcNow - _lastAnalysis).TotalMilliseconds < Options.DelayBetweenAnalyzingFrames ||
(_wasScanned && msSinceLastPreview < Options.DelayBetweenContinuousScans))
{
return;
}
_wasScanned = false;
_lastAnalysis = DateTime.UtcNow;
try
{
_photoCamera.GetPreviewBufferY(_luminance.PreviewBufferY);
var binarizer = new ZXing.Common.HybridBinarizer(_luminance);
var binBitmap = new BinaryBitmap(binarizer);
var result = _reader.decode(binBitmap);
if (result != null)
{
_wasScanned = true;
OnDecodingCompleted(result);
}
}
catch (Exception)
{
// If decoding fails it will throw a ReaderException
// and we're not interested in doing anything with it
}
}