Xamarin multiplatform - 来自jpeg序列的视频

时间:2017-03-21 15:01:09

标签: android ios xamarin windows-phone mjpeg

我想知道如何在Xamarin(所有平台)中显示来自jpegs的视频。

我的jpeg正在从流行的视频监控管理软件发送的http客户端流中流式传输。

我的jpeg采用 byte [] 的形式,我得到 10 jpegs / second 。这种格式是强加的。

我尝试在图片上快速更改来源,但这会导致Android上出现严重的叛逆。这似乎适用于Windows手机,但效果不佳。

如何为每个人创建一个视频播放器?除非我讨厌,否则现有组件无法做到这一点。

最佳,

1 个答案:

答案 0 :(得分:1)

谢谢杰森!效果很好,非常流畅的渲染!!

只需将带有NuGet的SkiaSharp.Views.Forms添加到项目中即可!

以下是代码(共享项目)中的内容:

// Content page initialization
private void InitUI() {

    Title = "Xamavideo";

    var button = new Button
    {
        Text = "Connect!"
    };
    Label label = new Label
    {
        Text = ""
    };

    var scroll = new ScrollView();
    scroll.BackgroundColor = Color.Black;
    Content = scroll;
    var stack = new StackLayout
    {
        Padding = 40,
        Spacing = 10
    };

    //Add a SKCanvasView item to the stack
    var videoCanvas = new SKCanvasView
    {                
        HeightRequest = 400,
        WidthRequest = 600,                
    };
    videoCanvas.PaintSurface += OnCanvasViewPaintSurface;
    stack.Children.Add(videoCanvas);
}

//Create the event handler
void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
    SKImageInfo info = args.Info;
    SKSurface surface = args.Surface;            

    // using (var stream = new SKManagedStream(fileStream))
    if (lastFrame == null) return;
    using (var canvas = surface.Canvas)
    // use KBitmap.Decode to decode the byte[] in jpeg format 
    using (var bitmap = SKBitmap.Decode(lastFrame))
    using (var paint = new SKPaint())
    {
        // clear the canvas / fill with black
        canvas.DrawColor(SKColors.Black);
        canvas.DrawBitmap(bitmap, SKRect.Create(640, 480), paint);
    }
}

void UpdateFrame(VideoClient client){

   //Use this to update the canvas:
   byte[] lastFrame = client.imageBytes;
   videoCanvas.InvalidateSurface();                                   
}