Logitech C920 USB网络摄像头的图像帧何时被UWP MediaFrameReader解码?

在MediaframeReader.frameReached事件之前或在调用sender.TryAcquireRelatesFrame()时是否对相机中的帧进行解码?

关于这个问题,你可以参考 Camera Frames 代码示例。从代码的角度来看。解压(解码)发生在 FrameArrived .

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);
        }
    }
}

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