public void OnPreviewFrame(IntPtr data, Camera camera)
{
using (var fastArray = new FastJavaByteArray(data))
{
OnPreviewFrameReady?.Invoke(this, fastArray);
camera.AddCallbackBuffer(fastArray);
}
}
public void OnPreviewFrame(byte[] data, Camera camera)
{
OnPreviewFrameReady?.Invoke(this, data);
}
public void OnSurfaceTextureUpdated(SurfaceTexture surface)
{
if (OnPreviewFrameReady == null)
{
return;
}
CameraAnalyzer.cameraFPSCounter.Report();
var dfps = 1;
switch (MainActivity.SavedDataStore.DetectionFPS)
{
case Classes.SaveData.DetectorFPS.FPS1:
dfps = 1;
break;
case Classes.SaveData.DetectorFPS.FPS5:
dfps = 5;
break;
case Classes.SaveData.DetectorFPS.FPS10:
dfps = 10;
break;
case Classes.SaveData.DetectorFPS.FPS15:
dfps = 15;
break;
case Classes.SaveData.DetectorFPS.FPS30:
dfps = 30;
break;
case Classes.SaveData.DetectorFPS.FPS60:
dfps = 60;
break;
}
TimeSpan pace = new TimeSpan(0, 0, 0, 0, 1000 / dfps); // in milliseconds, classification will not repeat faster than this value
var currentDate = DateTime.Now;
var interval = currentDate - lastAnalysis;
// control the pace of the machine vision to protect battery life
if (interval >= pace)
{
lastAnalysis = currentDate;
}
else
{
return; // don't run the classifier more often than we need
}
if (CameraAnalyzer.canAnalyze)
{
_ = Task.Factory.StartNew(() =>
{
using (var frame = Bitmap.CreateBitmap(owner.mTextureView.Width,
owner.mTextureView.Height,
Bitmap.Config.Argb8888))
{
owner.mTextureView.GetBitmap(frame);
using (var bmpframe = frame.ToSKBitmap())
{
var info = new SKImageInfo((int)(bmpframe.Width * 0.5), (int)(bmpframe.Height * 0.5));
using (var resized = bmpframe.Resize(info, SKFilterQuality.Low))
{
OnPreviewFrameReady.Invoke(resized.GetPixels(), info.Width, info.Height);
}
}
}
});
}
}
