iot/labs/Demo/Demo.iOS/Controls/SampleBufferDelegate.cs

using AVFoundation;
using CoreGraphics;
using CoreMedia;
using CoreVideo;
using SkiaSharp.Views.iOS;
using System;
using System.IO;
using UIKit;

namespace Demo.iOS.Controls
{
    public class SampleBufferDelegate : AVCaptureVideoDataOutputSampleBufferDelegate
    {
        public override void DidOutputSampleBuffer(AVCaptureOutput captureOutput, CMSampleBuffer sampleBuffer, AVCaptureConnection connection)
        {
            try
            {
                using (var pixelBuffer = sampleBuffer.GetImageBuffer() as CVPixelBuffer)
                {
                    pixelBuffer.Lock(CVPixelBufferLock.None);
                    var flags = CGBitmapFlags.PremultipliedFirst | CGBitmapFlags.ByteOrder32Little;
                    using (var cs = CGColorSpace.CreateDeviceRGB())
                    {
                        using (var context = new CGBitmapContext(pixelBuffer.BaseAddress,
                            pixelBuffer.Width,
                            pixelBuffer.Height,
                            8,
                            pixelBuffer.BytesPerRow,
                            cs,
                            (CGImageAlphaInfo)flags))
                        {
                            using (var cgImage = context.ToImage())
                            {
                                pixelBuffer.Unlock(CVPixelBufferLock.None);
                                var uiImage = UIImage.FromImage(cgImage);
                                using (var stream = new MemoryStream())
                                {
                                    uiImage.AsJPEG().AsStream().CopyTo(stream);
                                    var jpegBytes = stream.ToArray();
                                    var skBitmap = cgImage.ToSKBitmap();
                                    var base64 = Convert.ToBase64String(jpegBytes);
                                }
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                ex.ToString();
            }
            finally
            {
                try
                {
                    sampleBuffer.Dispose();
                }
                catch
                {
                }
            }
        }
    }
}