/// <summary>
/// Captures an image asynchronously.
/// </summary>
/// <param name="settings">The settings.</param>
/// <param name="ct">The ct.</param>
/// <returns>The image bytes</returns>
/// <exception cref="InvalidOperationException">Cannot use camera module because it is currently busy.</exception>
public async Task <byte[]> CaptureImageAsync(CameraStillSettings settings, CancellationToken ct = default)
{
if (Instance.IsBusy)
{
throw new InvalidOperationException("Cannot use camera module because it is currently busy.");
}
if (settings.CaptureTimeoutMilliseconds <= 0)
{
throw new ArgumentException($"{nameof(settings.CaptureTimeoutMilliseconds)} needs to be greater than 0");
}
try
{
OperationDone.Reset();
var output = new MemoryStream();
var exitCode = await ProcessRunner.RunProcessAsync(
settings.CommandName,
settings.CreateProcessArguments(),
(data, proc) =>
{
output.Write(data, 0, data.Length);
},
null,
true,
ct);
return(exitCode != 0 ? new byte[] { } : output.ToArray());
}
finally
{
OperationDone.Set();
}
}
/// <summary>
/// Captures a JPEG encoded image asynchronously at 90% quality.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ct">The ct.</param>
/// <returns>The image bytes</returns>
public Task <byte[]> CaptureImageJpegAsync(int width, int height, CancellationToken ct = default)
{
var settings = new CameraStillSettings
{
CaptureWidth = width,
CaptureHeight = height,
CaptureJpegQuality = 90,
CaptureTimeoutMilliseconds = 300,
};
return(CaptureImageAsync(settings, ct));
}
/// <summary>
/// Captures an image.
/// </summary>
/// <param name="settings">The settings.</param>
/// <returns>The image bytes</returns>
public byte[] CaptureImage(CameraStillSettings settings)
{
return(CaptureImageAsync(settings).GetAwaiter().GetResult());
}
/// <summary>
/// Captures an image asynchronously.
/// </summary>
/// <param name="settings">The settings.</param>
/// <returns></returns>
public async Task <byte[]> CaptureImageAsync(CameraStillSettings settings)
{
var cts = new CancellationTokenSource();
return(await CaptureImageAsync(settings, cts.Token));
}
