private void DisplayVideoFrames(object state)
{
while (running)
{
if (videoObject != null &&
videoObject.IsConnected &&
previewOn)
{
try
{
IVideoFrame frame = useVariantPixels
? videoObject.LastVideoFrameVariant
: videoObject.LastVideoFrame;
if (frame != null &&
(frame.FrameNumber == -1 || frame.FrameNumber != lastDisplayedVideoFrameNumber))
{
lastDisplayedVideoFrameNumber = frame.FrameNumber;
Bitmap bmp = null;
if (Settings.Default.UseNativeCode)
{
cameraImage.SetImageArray(
useVariantPixels
? frame.ImageArrayVariant
: frame.ImageArray,
imageWidth,
imageHeight,
videoObject.SensorType);
bmp = cameraImage.GetDisplayBitmap();
}
else
{
Array safeArr = useVariantPixels
? (Array)frame.ImageArrayVariant
: (Array)frame.ImageArray;
int[,] pixels;
if (safeArr is int[, ])
{
pixels = (int[, ])safeArr;
}
else if (safeArr is object[, ])
{
pixels = new int[imageHeight, imageWidth];
Array.Copy(safeArr, pixels, imageWidth * imageHeight);
}
else
{
throw new NotSupportedException("Unsupported pixel format in Managed mode.");
}
bmp = new Bitmap(imageWidth, imageHeight);
BitmapData bmData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
try
{
unsafe
{
int stride = bmData.Stride;
IntPtr Scan0 = bmData.Scan0;
byte * p = (byte *)(void *)Scan0;
int nOffset = stride - bmp.Width * 3;
for (int y = 0; y < bmp.Height; ++y)
{
for (int x = 0; x < bmp.Width; ++x)
{
byte red = (byte)pixels[y, x];
p[0] = red;
p[1] = red;
p[2] = red;
p += 3;
}
p += nOffset;
}
}
}
finally
{
bmp.UnlockBits(bmData);
}
}
Invoke(new PaintVideoFrameDelegate(PaintVideoFrame), new object[] { frame, bmp });
}
}
catch (ObjectDisposedException) { }
catch (Exception ex)
{
Trace.WriteLine(ex);
Bitmap errorBmp = new Bitmap(pictureBox.Width, pictureBox.Height);
using (Graphics g = Graphics.FromImage(errorBmp))
{
g.Clear(Color.Tomato);
g.DrawString(ex.Message, debugTextFont, Brushes.Black, 10, 10);
g.Save();
}
try
{
Invoke(new PaintVideoFrameDelegate(PaintVideoFrame), new object[] { null, errorBmp });
}
catch (InvalidOperationException)
{
// InvalidOperationException could be thrown when closing down the app i.e. when the form has been already disposed
}
}
}
Thread.Sleep(1);
Application.DoEvents();
}
}
