IVideoCompositor Antarmuka

Definisi

Ruang nama:

Windows.Media.Effects

Antarmuka yang Anda terapkan untuk membuat komposit video kustom.

public interface class IVideoCompositor : IMediaExtension

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Guid(2232464446, 16908, 16911, 150, 199, 124, 152, 187, 161, 252, 85)]
struct IVideoCompositor : IMediaExtension

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Guid(2232464446, 16908, 16911, 150, 199, 124, 152, 187, 161, 252, 85)]
public interface IVideoCompositor : IMediaExtension

Public Interface IVideoCompositor
Implements IMediaExtension

Atribut

ContractVersionAttribute GuidAttribute

Penerapan

IMediaExtension

Persyaratan Windows

Rangkaian perangkat	Windows 10 (diperkenalkan dalam 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (diperkenalkan dalam v1.0)

Contoh

menggunakan Microsoft.Graphics.Canvas; menggunakan Microsoft.Graphics.Canvas.Effects; menggunakan Windows.Foundation.Collections; menggunakan Windows.Graphics.DirectX.Direct3D11; menggunakan Windows.Media.Effects; menggunakan Windows.Media.MediaProperties; menggunakan Windows.UI;

namespace Effects
{
    /// <summary>
    /// Chroma key compositor
    /// <list type="Bullet">
    /// <listheader>Properties</listheader>
    /// <item>Color (Color) : Chroma key color (default is black)</item>
    /// <item>Feather (Boolean): true to soften edges of the output (default is false)</item>
    /// <item>Tolerance (float): Color tolerance 0-1 (default is 0.1)</item>
    /// <item>InvertAlpha (Boolean): invert the alpha value (default is false)</item>
    /// </list>
    /// </summary>
    public sealed class ChromaKeyVideoCompositor : IVideoCompositor
    {
        #region Fields
        private VideoEncodingProperties _backgroundProperties;
        private CanvasDevice _canvasDevice;
        #endregion

        #region Properties
        /// <summary>
        /// Gets the chroma-key color
        /// </summary>
        public Color Color { get; private set; } = Colors.Black;

        /// <summary>
        /// Gets a value indicating whether to feather the edges of the chroma key
        /// </summary>
        public bool Feather { get; private set; } = false;

        /// <summary>
        /// Gets the color tolerance 
        /// </summary>
        public float Tolerance { get; private set; } = 0.1f;

        /// <summary>
        /// Gets a value indicating whether to invert the alpha transparency
        /// </summary>
        public bool InvertAlpha { get; private set; } = false;

        /// <summary>
        /// Gets a value indicating whether the compositor is time-independent
        /// </summary>
        public bool TimeIndependent => true;
        #endregion

        #region Methods
        /// <summary>
        /// Sets the encoding properties
        /// </summary>
        /// <param name="backgroundProperties">the background properties</param>
        /// <param name="device">the Direct3D device</param>
        public void SetEncodingProperties(VideoEncodingProperties backgroundProperties, IDirect3DDevice device)
        {
            _backgroundProperties = backgroundProperties;

            _canvasDevice = CanvasDevice.CreateFromDirect3D11Device(device);
        }

        /// <summary>
        /// Composite the frame
        /// </summary>
        /// <param name="context">the composite frame context</param>
        public void CompositeFrame(CompositeVideoFrameContext context)
        {
            foreach (var surface in context.SurfacesToOverlay)
            {
                using (CanvasBitmap inputBitmap = CanvasBitmap.CreateFromDirect3D11Surface(_canvasDevice, surface))
                using (CanvasRenderTarget renderTarget = CanvasRenderTarget.CreateFromDirect3D11Surface(_canvasDevice, context.OutputFrame.Direct3DSurface))
                using (CanvasDrawingSession ds = renderTarget.CreateDrawingSession())
                using (var chromaKeyEffect = new ChromaKeyEffect
                {
                    Source = inputBitmap,
                    Color = Color,
                    Feather = Feather,
                    Tolerance = Tolerance,
                    InvertAlpha = InvertAlpha
                })
                {
                    var overlay = context.GetOverlayForSurface(surface);

                    var destinationRectangle = overlay.Position;

                    var sourceRectangle = inputBitmap.Bounds;

                    var opacity = System.Convert.ToSingle(overlay.Opacity);

                    ds.DrawImage(chromaKeyEffect, destinationRectangle, sourceRectangle, opacity);
                }
            }
        }

        /// <summary>
        /// Close the compositor & dispose of the canvas device
        /// </summary>
        /// <param name="reason">the media effect closed reason</param>
        public void Close(MediaEffectClosedReason reason)
        {
            if (_canvasDevice != null)
            {
                _canvasDevice.Dispose();
                _canvasDevice = null;
            }
        }

        /// <summary>
        /// Discard of the queued frames
        /// </summary>
        /// <remarks>this does nothing</remarks>
        public void DiscardQueuedFrames()
        {
        }

        /// <summary>
        /// Sets the properties passed into the compositor
        /// </summary>
        /// <param name="configuration">the configuration</param>
        public void SetProperties(IPropertySet configuration)
        {
            if (configuration == null)
            {
                return;
            }

            object value;

            if (configuration.TryGetValue("Color", out value))
            {
                Color = (Color)value;
            }

            if (configuration.TryGetValue("Tolerance", out value))
            {
                Tolerance = (float)value;
            }

            if (configuration.TryGetValue("Feather", out value))
            {
                Feather = (bool)value;
            }

            if (configuration.TryGetValue("InvertAlpha", out value))
            {
                InvertAlpha = (bool)value;
            }
        }
        #endregion
    }
}

Keterangan

1. Dalam proyek Komponen Runtime Windows, dapatkan kelas yang disegel publik dari antarmuka ini (lihat contoh di bawah).

2. Gunakan nama kelas lengkap dalam konstruktor MediaOverlayLayer .

   var propertySet = new PropertySet { ["Feather"] = true, ["Tolerance"] = 0,2f, ["Color"] = Colors.Blue };

   var compositorDefinition = new VideoCompositorDefinition( "Effects.ChromaKeyVideoCompositor", propertySet);

   var mediaOverlayLayer = new MediaOverlayLayer(compositorDefinition);

Properti

TimeIndependent

Mendapatkan nilai yang menunjukkan apakah efek video kustom independen waktu.

Metode

Close(MediaEffectClosedReason)	Dipanggil ketika komposit video harus menutup dan membersihkan sumber daya yang dialokasikan.
CompositeFrame(CompositeVideoFrameContext)	Dipanggil ketika bingkai tersedia untuk komposisi oleh komposit video kustom.
DiscardQueuedFrames()	Dipanggil untuk memungkinkan implementasi komposit video secara opsional membuang status tersimpan yang terkait dengan bingkai yang telah diterima.
SetEncodingProperties(VideoEncodingProperties, IDirect3DDevice)	Dipanggil untuk mengatur properti pengodean komposit video kustom.
SetProperties(IPropertySet)	Mengatur properti konfigurasi yang disediakan ketika pengurai media atau codec didaftarkan. (Diperoleh dari IMediaExtension)

Lihat juga

• IMediaExtension