问Win10 UWP自定义视频效果，IBasicVideoEffect

EN

namespace Win10QR
{
    public class MyVideoEffect : IBasicVideoEffect
    {
        public bool IsReadOnly
        {
            get
            {
                return false;
            }
        }

        public IReadOnlyList<VideoEncodingProperties> SupportedEncodingProperties
        {
            get
            {
                var properties = new List<VideoEncodingProperties>();
                properties.Add(VideoEncodingProperties.CreateUncompressed("ARGB32", 640, 480));
                return properties;
            }
        }

        public MediaMemoryTypes SupportedMemoryTypes
        {
            get
            {
                return MediaMemoryTypes.GpuAndCpu;
            }
        }

        public bool TimeIndependent
        {
            get
            {
                return false;
            }
        }

        public void Close(MediaEffectClosedReason reason)
        {

        }

        public void DiscardQueuedFrames()
        {

        }

        public void ProcessFrame(ProcessVideoFrameContext context)
        {
            var resultString = AnalyzeBitmap(context.InputFrame.SoftwareBitmap);

            if (resultString != null)
            {
                Debug.WriteLine(resultString);
            }
        }

        public void SetEncodingProperties(VideoEncodingProperties encodingProperties, IDirect3DDevice device)
        {

        }

        public void SetProperties(IPropertySet configuration)
        {

        }

        private string AnalyzeBitmap(SoftwareBitmap bitmap)
        {
            var reader = new BarcodeReader();
            var writableBitmap = new WriteableBitmap(bitmap.PixelWidth, bitmap.PixelHeight);
            bitmap.CopyToBuffer(writableBitmap.PixelBuffer);

            var result = reader.Decode(writableBitmap);

            if (result != null)
            {
                return result.Text;
            }

            return null;
        }
    }
}