Capturing a byte[] image data from WPFMediaKit

Question

I have a bit of code that I have been working with to capture an image from a VideoCaptureElement from WPFMediaKit. it works great!

    bmp.Render(videoElement);
    BitmapEncoder encoder = new JpegBitmapEncoder();
    encoder.Frames.Add(BitmapFrame.Create(bmp));
    string now = DateTime.Now.Year + "" + DateTime.Now.Month + "" + DateTime.Now.Day + "" + DateTime.Now.Hour + "" + DateTime.Now.Minute + "" + DateTime.Now.Second;
    string filename = now + "pic.jpg";
    FileStream fstream = new FileStream(filename, FileMode.Open);
    encoder.Save(fstream);
    fstream.Close();

The problem I am facing though is that I need to get a byte[] data now rather than save a file. Currently I am doing this with a open filedialog box and a filestream:

            if (File.Exists(FileLocation))
            {
                //Retreave image from file and binary it to Object image
                using (FileStream stream = File.Open(FileLocation, FileMode.Open))
                {
                    BinaryReader br = new BinaryReader(stream);
                    byte[] data = br.ReadBytes(maxImageSize);
                    image = new Image(dlg.SafeFileName, data, fileSize);
                }
            }

What I'd like to do is to take the capture and rather than save a file, I'd like to get it as a byte[] type. Is there a way to convert either RenderTargetBitmap or BitmapEncoder to a byre[] array? Or possibly I'm thinking to convert those to a memory stream so a binary reader can use it?

thanks!

Do you want raw data, or a bmp file in memory (with header)? — , Jun 28 '13 at 16:53

Zenchovey · Answer 1 · 2013-06-28T16:37:54.957

1

To convert an BitmapSource to a byte array you can do something like this, Where bmp is your BitmapSource or RenderTargetBitmap.

BitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmp));

byte[] arr = null;
using (MemoryStream memStream = new MemoryStream())
{
    encoder.Save(memStream);
    arr = stream.ToArray();
}

edited Jun 28 '13 at 16:37

answered Jun 28 '13 at 15:55

Zenchovey

121
7

1

+1, `memStream.ToArray()` is a slightly easier way to convert the memory stream to a byte array. – vcsjones Jun 28 '13 at 15:59
is memstream.length the filesize? – Herrozerro Jun 28 '13 at 16:08
thanks for that vcsjones and memstream.length is the length in bytes of the stream, so yes, you could say its the file size of the image you added to the encoder. – Zenchovey Jun 28 '13 at 16:40

score 0 · Answer 2 · answered Jun 28 '13 at 16:57

In addition to the already mentioned saving to a stream in bmp format, you can also call CopyPixels on a BitmapSource.

That will give you the original pixels, in the original format, with no header.

See this msdn link

Capturing a byte[] image data from WPFMediaKit

2 Answers2