# System video source

Media Blocks SDK .Net

SystemVideoSourceBlock is used to access webcams and other video capture devices.

# Block info

Name: SystemVideoSourceBlock.

Pin direction Media type Pins count
Output video uncompressed video 1

# Enumerate available devices

Use the DeviceEnumerator.Shared.VideoSourcesAsync() method to get a list of available devices and their specifications: available resolutions, frame rates, and video formats.

# The sample pipeline 

graph LR;
    SystemVideoSourceBlock-->VideoRendererBlock;

# Sample code 

// create pipeline
var pipeline = new MediaBlocksPipeline();

// create video source
VideoCaptureDeviceSourceSettings videoSourceSettings = null;

// select the first device
var device = (await DeviceEnumerator.Shared.VideoSourcesAsync())[0];
if (device != null)
{
    // select the first format (maybe not the best, but it is just a sample)
    var formatItem = device.VideoFormats[0];
    if (formatItem != null)
    {
        videoSourceSettings = new VideoCaptureDeviceSourceSettings(device)
        {
            Format = formatItem.ToFormat()
        };

        // select the first frame rate
        videoSourceSettings.Format.FrameRate = formatItem.FrameRateList[0];
    }
}

// create video source block using the selected device and format
var videoSource = new SystemVideoSourceBlock(videoSourceSettings);

// create video renderer block
var videoRenderer = new VideoRendererBlock(pipeline, VideoView1);

// connect blocks
pipeline.Connect(videoSource.Output, videoRenderer.Input);

// start pipeline
await pipeline.StartAsync();

# Sample applications

# Remarks

You can specify an API to use when enumerating devices. Windows and Linux platforms have multiple APIs, while Android and iOS platforms have only one API.

# Platforms

Windows, macOS, Linux, iOS, Android.