public byte[] TakePicture(PictureSize pictureSize, Percent jpegCompressionRate = default(Percent))
{
if (IsVideoStreamOpenned)
{
return(new byte[0]);
}
Console.WriteLine("TakePicture");
if (picturesCache.HasPicture(devicePath, pictureSize, jpegCompressionRate))
{
Console.WriteLine("Read picture from cache");
return(picturesCache.GetPicture(devicePath, pictureSize, jpegCompressionRate));
}
var pictureBuffer = RaspberryCamInterop.TakePicture(devicePath, (uint)pictureSize.Width,
(uint)pictureSize.Height, (uint)(100 - jpegCompressionRate.Value));
var data = new byte[pictureBuffer.Size];
Marshal.Copy(pictureBuffer.Data, data, 0, pictureBuffer.Size);
picturesCache.AddPicture(devicePath, pictureSize, jpegCompressionRate, data);
return(data);
}
public void StopVideoStreaming()
{
if (!IsVideoStreamOpenned)
{
return;
}
RaspberryCamInterop.CloseCameraStream(videoStreamHandle);
videoStreamHandle = IntPtr.Zero;
}
public void StartVideoStreaming(PictureSize pictureSize, int fps = 20)
{
if (IsVideoStreamOpenned)
{
return;
}
videoStreamFps = fps;
videoFramesInterval = 1000 / videoStreamFps;
videoStreamHandle = RaspberryCamInterop.OpenCameraStream(devicePath,
(uint)pictureSize.Width, (uint)pictureSize.Height, (uint)fps);
}
private static void Main(string[] args)
{
Console.WriteLine("Starting...");
var handle = RaspberryCamInterop.OpenCameraStream("/dev/video0", 640, 480, 20);
var previousSize = 0;
var data = new byte [0];
for (int i = 0; i < 100; i++)
{
var watch = Stopwatch.StartNew();
var pictureBuffer = RaspberryCamInterop.GrabVideoFrame(handle);
watch.Stop();
Console.WriteLine("GrabVideoFrame take: {0} ms", watch.ElapsedMilliseconds);
/*
* if we allocate a new buffer for each frame, the garbadge collector pause the app while collecting.
*/
if (pictureBuffer.Size > previousSize)
{
data = new byte[pictureBuffer.Size];
}
Marshal.Copy(pictureBuffer.Data, data, 0, pictureBuffer.Size);
/*
* if you uncomment this, you will solicit garbage collection and decrease performances
*/
//MemoryStream s = new MemoryStream(data);
//using (var fs = File.Open(string.Format("capture_{0}.raw", i), FileMode.Create))
//{
// s.CopyTo(fs);
// s.Flush();
// fs.Flush();
//}
}
RaspberryCamInterop.CloseCameraStream(handle);
}
public byte[] GetVideoFrame(Percent compressionRate = default(Percent))
{
if (!IsVideoStreamOpenned)
{
return(new byte[0]);
}
if (!CanReadVideoFrame)
{
Thread.Sleep(RemainingWaitingMilliseconds);
}
var pictureBuffer = RaspberryCamInterop.ReadVideoFrame(videoStreamHandle, (uint)(100 - compressionRate.Value));
var data = new byte[pictureBuffer.Size];
Marshal.Copy(pictureBuffer.Data, data, 0, pictureBuffer.Size);
return(data);
}
