public async Task <ActionResult> GetImage()
{
if (DateTime.Now.Hour > 18 || DateTime.Now.Hour < 7)
{
_logger.LogInformation("Tuning for night mode...");
MMALCameraConfig.ExposureCompensation = (int)MMAL_PARAM_EXPOSUREMODE_T.MMAL_PARAM_EXPOSUREMODE_NIGHT;
}
else
{
_logger.LogInformation("Tuning for normal mode...");
MMALCameraConfig.ExposureCompensation = (int)MMAL_PARAM_EXPOSUREMODE_T.MMAL_PARAM_EXPOSUREMODE_OFF;
}
byte[] imageData;
using (var imgCaptureHandler = new MemoryStreamCaptureHandler())
{
_logger.LogInformation("Capturing the picture...");
await _camera.TakePicture(imgCaptureHandler, MMALEncoding.JPEG, MMALEncoding.I420);
imageData = new byte[imgCaptureHandler.CurrentStream.Length];
imgCaptureHandler.CurrentStream.Seek(0, System.IO.SeekOrigin.Begin);
imgCaptureHandler.CurrentStream.Read(imageData, 0, imageData.Length);
_logger.LogInformation("Captured the picture...");
}
return(File(imageData, "image/jpeg"));
}
private async Task BuildCameraPipelineAsync(CancellationToken cancellationToken)
{
camera.ConfigureCameraSettings();
this.imageEncoder = new MMALImageEncoder();
this.memoryStreamHandler = new MemoryStreamCaptureHandler();
this.resizer = new MMALResizerComponent();
this.nullSink = new MMALNullSinkComponent();
this.portConfig = new MMALPortConfig(MMALEncoding.JPEG, MMALEncoding.I420, 90);
this.resizerPortConfig = new MMALPortConfig(MMALEncoding.I420, MMALEncoding.I420, 1024, 768, 0, 0, 0, false, null);
this.imageEncoder.ConfigureOutputPort(this.portConfig, memoryStreamHandler);
this.resizer.ConfigureInputPort(new MMALPortConfig(MMALEncoding.OPAQUE, MMALEncoding.I420), camera.Camera.StillPort, null)
.ConfigureOutputPort(this.resizerPortConfig, null);
camera.Camera.StillPort.ConnectTo(resizer);
this.resizer.Outputs[0].ConnectTo(imageEncoder);
camera.Camera.PreviewPort.ConnectTo(nullSink);
await Task.Delay(TimeSpan.FromSeconds(2), cancellationToken);
}
private void ClearCameraPipeline()
{
if (this.nullSink != null)
{
this.nullSink.Dispose();
this.nullSink = null;
}
if (this.imageEncoder != null)
{
this.imageEncoder.Dispose();
this.imageEncoder = null;
}
if (this.resizer != null)
{
this.resizer.Dispose();
this.resizer = null;
}
if (this.memoryStreamHandler != null)
{
this.memoryStreamHandler.Dispose();
this.memoryStreamHandler = null;
}
}