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Still image recording library

The project currently includes VideoDevice.

Prerequisites

VideoDevice Prerequisites

  • Install v4l-utils.
sudo apt-get install v4l-utils
  • Install System.Drawing native dependencies.
sudo apt-get install libc6-dev libgdiplus libx11-dev

SoundDevice Prerequisites

  • Install libasound2-dev.
sudo apt-get install libasound2-dev

Usage

SoundDevice

  • Create a SoundConnectionSettings and set the parameters for recording (Optional).
SoundConnectionSettings settings = new SoundConnectionSettings();
  • Create a communications channel to a sound device.
using SoundDevice device = SoundDevice.Create(settings);
  • Play a WAV file
device.Play("/home/pi/music.wav");
  • Record some sounds
// Record for 10 seconds and save in "/home/pi/record.wav"
device.Record(10, "/home/pi/record.wav");

Using continuous recording

You can start recording and record chunks of 1 second continuously. This can be used in scenarios when you need to record a duration that is not know in advance.

SoundConnectionSettings settings = new SoundConnectionSettings();
using SoundDevice device = SoundDevice.Create(settings);
Console.WriteLine("Press a key to stop recording");
device.StartRecording("recording.wav");
while(!Console.KeyAvailable)
{
    Thread.Spin(1);
}
device.StopRecording();
device.Play("recording.wav");

VideoDevice

  • Create a VideoConnectionSettings and set the parameters for capture.
VideoConnectionSettings settings = new VideoConnectionSettings(busId: 0, captureSize: (2560, 1920), pixelFormat: PixelFormat.YUYV);
  • Create a communications channel to a video device.
using VideoDevice device = VideoDevice.Create(settings);
  • Capture static image
// Capture static image
device.Capture("/home/pi/jpg_direct_output.jpg");

// Change capture setting
device.Settings.PixelFormat = PixelFormat.YUV420;

// Get image stream, convert pixel format and save to file
MemoryStream ms = device.Capture();
Color[] colors = VideoDevice.Yv12ToRgb(ms, settings.CaptureSize);
Bitmap bitmap = VideoDevice.RgbToBitmap(settings.CaptureSize, colors);
bitmap.Save("/home/pi/yuyv_to_jpg.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
  • Other methods
// Get the supported formats of the device
IEnumerable<PixelFormat> formats = device.GetSupportedPixelFormats();
// Get the resolutions of the format
IEnumerable<(uint Width, uint Height)> resolutions = device.GetPixelFormatResolutions(PixelFormat.YUYV));
// Query v4l2 controls default and current value
VideoDeviceValue value = device.GetVideoDeviceValue(VideoDeviceValueType.Rotate);