73 строки
2.7 KiB
C#
73 строки
2.7 KiB
C#
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namespace NativeFilterDemo
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{
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows;
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using CameraEffectInterface;
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/// <summary>
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/// A class to work around a problem with MediaElement.
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/// MediaElement doesn't destruct the current MediaStreamSource when the source is changed.
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/// To avoid memory leaks when source is changed (for example when navigating away from a page)
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/// reserve the memory once and use it for all the MediaStreamSource instances we create.
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/// </summary>
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public sealed class CameraStreamSourceDataSingleton
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{
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private const int FramePixelSize = 4; // RGBA
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private const int NumberOfBufferedFrames = 1;
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private static CameraStreamSourceDataSingleton classInstance = null;
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public static CameraStreamSourceDataSingleton Instance
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{
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get
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{
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if (classInstance == null)
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{
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classInstance = new CameraStreamSourceDataSingleton();
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}
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return classInstance;
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}
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}
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public byte[] ImageBuffer { get; private set; }
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public MemoryStream FrameStream { get; private set; }
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public int FrameHeight { get; private set; }
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public int FrameWidth { get; private set; }
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public int FrameBufferSize { get; private set; }
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public int FrameStreamSize { get; private set; }
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public ICameraEffect CameraEffect { get; set; }
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/// <summary>
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/// Create the buffers of the data source
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/// </summary>
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/// <param name="cameraFrameSize">The dimensions of a camera frame</param>
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public void Initialize(Windows.Foundation.Size cameraFrameSize)
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{
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if (this.FrameWidth != 0)
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{
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if (((int)cameraFrameSize.Width != this.FrameWidth)
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|| ((int)cameraFrameSize.Height != this.FrameHeight))
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{
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// Currently, we don't allow changing the frame size
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// after first initialization
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throw new NotSupportedException();
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}
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return; // singleton is already initialized.
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}
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this.FrameWidth = (int)cameraFrameSize.Width;
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this.FrameHeight = (int)cameraFrameSize.Height;
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this.FrameBufferSize = FrameWidth * FrameHeight * FramePixelSize;
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this.ImageBuffer = new byte[FrameBufferSize];
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this.FrameStreamSize = FrameBufferSize * NumberOfBufferedFrames;
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this.FrameStream = new MemoryStream(ImageBuffer);
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}
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}
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}
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