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if there is an available sample; if so, you extract it and use the ReportGetSampleCompleted() method on the MSS to asynchronously report the sample back to the MediaElement (for more details on this, please refer back to recipe 10-7). On the other hand, if there are no samples in the sample buffer, you block on the AutoResetEvent named VideoSampleArrived waiting for a sample to arrive from the video sink. Recall from earlier that this gets signaled when the sink enqueues a sample into the buffer. If you look at the AudioSampleDispatch_DoWork() method you will notice an identical loop for sample processing. The rest of the MSS method implementations do not serve any meaningful purpose for this sample application, so we do not discuss them here. So now that you have seen how the sinks and the MediaStreamSource are implemented, let s look at how they are tied together. Listing 10-41 shows the code behind for the MainPage where it happens. Listing 10-41. MainPage code behind public partial class MainPage : UserControl { VideoBrush vidbrush = new VideoBrush(); CaptureSource webcamCapture = new CaptureSource(); WebCamMSS mss = null; WebCamVideoSink vSink = new WebCamVideoSink(); WebCamAudioSink aSink = new WebCamAudioSink(); public MainPage() { InitializeComponent(); this.Loaded += new RoutedEventHandler(MainPage_Loaded); } void MainPage_Loaded(object sender, RoutedEventArgs e) { webcamCapture.VideoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice(); webcamCapture.AudioCaptureDevice = CaptureDeviceConfiguration.GetDefaultAudioCaptureDevice(); mss = new WebCamMSS(meWebCamOut,vSink, aSink); mss.WebCamSource = webcamCapture; vidbrush.SetSource(webcamCapture); webcamDirectCapture.Background = vidbrush; vSink.FormatChanged += new EventHandler<VideoFormatChangedEventArgs>(vSink_FormatChanged); } private void BtnCaptureStartStop_Click(object sender, RoutedEventArgs e) winforms upc-a reader Packages matching Tags:"UPC-A" - NuGet Gallery
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create barcode c# .net NET WinForms or web program, you can directly use all linear barcode reading features it provide, such as reading UPC-A barcode from rotated image (180 ... 2d barcode reader java { if (webcamCapture.State == CaptureState.Stopped) { if (CaptureDeviceConfiguration.AllowedDeviceAccess || CaptureDeviceConfiguration.RequestDeviceAccess()) webcamCapture.Start(); } else if (webcamCapture.State == CaptureState.Started) webcamCapture.Stop(); } void vSink_FormatChanged(object sender, VideoFormatChangedEventArgs e) { this.Dispatcher.BeginInvoke(new Action(() => { //correct for negative stride if (e.Format.Stride < 0) { brdrMediaElement.Projection = new PlaneProjection() { CenterOfRotationX = 0.5, RotationX = 180 }; } })); } } On the Loaded event handler of the MainPage, you initialize our CaptureSource named webcamCapture with the default video and audio capture devices on the system, create and initialize the custom MediaStreamSource, and also use webcamCapture in a VideoBrush to paint a Border object named webcamDirectCapture that shows the direct video capture results side by side with the MSS processed video. In BtnCaptureStartStop_Click(), you either request access and start the capture or stop the capture based on the current state of the CaptureSource. Lastly, you handle the FormatChanged event of the VideoSink here as well. If you look at the vSink_FormatChanged() event handler method, you will see that you apply a PlaneProjection to turn the MediaElement by 180 degrees around the X-axis if the VideoFormat.Stride value is negative. The stride of a bitmap is dependent on the order in which the pixels in a bitmap are stored. When a bitmap is stored with the pixels going from top to bottom, it has a negative stride and will appear to be vertically flipped. This is what you correct using the PlaneProjection. Figure 10-31 shows the result if the above mentioned stride correction was not made on the MediaElement on the left. winforms upc-a reader .NET UPC-A Barcode Reader/Scanner Control | How to Scan UPC ...
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vb.net qr code generator source code Compatible with GS1 Barcode Standard for linear UPC-A encoding in .NET applications; Generate and create linear UPC-A in .NET WinForms, ASP.NET and . asp.net qr code reader With HTTP being the most ubiquitous protocol on the Internet, the benefit of being able to deliver video streams over HTTP with a high degree of reliability and quality is very important to the future of glitch-free, high-definition video streaming The reality, however, is that network bandwidth fluctuates over time Also, the processing capacity of a client computing device can vary over time, too, depending on the CPU load due to the various programs running on it These factors can cause degradation of the quality of the viewing experience if a video stutters or freezes while the player is waiting to buffer enough data to show the next set of video frames or waiting for the CPU cycles needed to decode those frames An approach called adaptive streaming addresses this problem by adapting the bitrate to prevailing resource constraints. An event is of the class org.zkoss.zk.ui.event.Event and is used to notify an application what has happened. Each type of event is represented by a distinct class. For example, org.zkoss.zk.ui.event.MouseEvent denotes a mouse activity, such as clicking. To respond to an event, an application must register one or more event listeners to the event. There are three ways to register an event listener to a component. One is by specifying the onXxx event listener as the component s attribute, where Xxx represents the name of the action, as shown in Listing 4-13. In the adaptive streaming approach, the same media is encoded in small sized chunks at multiple bitrates and is delivered over a specialized streaming server The video player on the client computer constantly monitors network conditions, CPU load, and other resource utilization metrics on the client computer, and uses that information to calculate the most appropriate bitrate that it can decode and render efficiently given the current conditions The player requests chunks of video encoded at that currently appropriate bit rate, and the streaming server responds with content from the video sources encoded at that bit rate As a result, when resource conditions degrade, the player can continue displaying the video without any significant disruptions and with only a slight degradation in overall resolution until an improvement or further degradation in conditions causes a different bit rate to be requested. winforms upc-a reader UPC-A .NET WinForms Library - UPC-A barcode image generator ...
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