public int DelayChanged(int percentage)
{
// Set the new delay, and give back the value in seconds.
// The value given back is just an integer, not a double, because we don't have that much precision.
// The frame rate is roughly estimated from frame received by seconds,
// and there is a latency inherent to the camcorder that we can't know.
m_iFrameIndex = (int)(((double)m_FrameBuffer.Capacity / 100.0) * percentage);
double interval = (m_FrameGrabber.FramesInterval > 0)?(double)m_FrameGrabber.FramesInterval:40.0;
int delay = (int)(((double)m_iFrameIndex * interval) / 1000);
// Re-adjust frame for the special case of no delay at all.
// (it's not always easy to drag all the way left to the real 0 spot).
if (delay < 1)
{
m_iFrameIndex = 0;
}
// Explicitely call the refresh if we are not currently grabbing.
if (!m_FrameGrabber.IsGrabbing)
{
m_ImageToDisplay = m_FrameBuffer.ReadAt(m_iFrameIndex);
if (!m_bPainting)
{
m_bPainting = true;
m_Container.DoInvalidate();
}
}
return(delay);
}
public void FrameGrabbed()
{
//----------------------------------------------
// NOTE : This method is in the GRABBING thread,
// NO UI calls can be made directly from here.
// must use BeginInvoke at some point.
//----------------------------------------------
// The frame grabber has just pushed a new frame to the buffer.
// Consolidate this real-time frame locally.
Bitmap temp = m_FrameBuffer.ReadFrameAt(0);
// Copy the frame over if size change is needed.
if (!temp.Size.Equals(m_ImageSize))
{
m_MostRecentImage = new Bitmap(m_ImageSize.Width, m_ImageSize.Height);
Graphics g = Graphics.FromImage(m_MostRecentImage);
Rectangle rDst = new Rectangle(0, 0, m_MostRecentImage.Width, m_MostRecentImage.Height);
RectangleF rSrc = new Rectangle(0, 0, temp.Width, temp.Height);
g.DrawImage(temp, rDst, rSrc, GraphicsUnit.Pixel);
}
else
{
m_MostRecentImage = temp;
}
// Ask a refresh. This could also be done with a timer,
// but using the frame grabber event is convenient.
if (!m_bPainting)
{
m_bPainting = true;
m_Container.DoInvalidate();
}
// We also use this event to commit frame to disk during saving.
// However, it is what is drawn on screen that will be pushed to the file,
// not the frame the device just grabbed.
if (m_bIsRecording)
{
// Is it necessary to make another copy of the frame ?
Bitmap bmp = GetFlushedImage();
SaveResult res = m_VideoFileWriter.SaveFrame(bmp);
if (res != SaveResult.Success)
{
log.Error("Error while saving frame to file.");
DisplayError(res);
bmp.Dispose();
m_bIsRecording = false;
m_VideoFileWriter.CloseSavingContext(true);
// TODO: remove broken file.
}
else
{
if (!m_bCaptureThumbSet)
{
m_CurrentCaptureBitmap = bmp;
m_bCaptureThumbSet = true;
}
else
{
bmp.Dispose();
}
}
}
}