Question

当Windows 10 UWP .NET C＃应用程序的MediaFrameReader.FrameArrived事件接收到来自Logitech C920 USB网络摄像头的图像帧时，在哪里进行解压缩（解码）？

是在MediaFrameReader.FrameArrived事件之前还是在我调用sender.TryAcquireLatestFrame（）时，摄像机的帧是否已解码？

Answer 1

是在MediaFrameReader.FrameArrived事件之前还是在我调用sender.TryAcquireLatestFrame（）时，摄像机的帧是否已解码？

对于此问题，您可以参考Camera Frames代码示例。从代码的角度来看。解压缩（解码）发生在FrameArrived之前。

private void FrameReader_FrameArrived(MediaFrameReader sender, MediaFrameArrivedEventArgs args)
{
    // TryAcquireLatestFrame will return the latest frame that has not yet been acquired.
    // This can return null if there is no such frame, or if the reader is not in the
    // "Started" state. The latter can occur if a FrameArrived event was in flight
    // when the reader was stopped.
    using (var frame = sender.TryAcquireLatestFrame())
    {
        if (frame != null)
        {
            var renderer = _frameRenderers[frame.SourceKind];
            renderer.ProcessFrame(frame);
        }
    }
}

因为帧具有contained SoftwareBitmap。这意味着原始数据已被解码，然后打包为帧实例。

UWP MediaFrameReader解码Logitech C920 USB网络摄像头的图像帧的时间

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