/// <summary>
/// Configure device and report frame format that will be used during streaming.
/// This method must return a proper ImageDescriptor so we can pre-allocate buffers.
/// </summary>
public ImageDescriptor Prepare()
{
ConfigureDevice();
AForge.Video.DirectShow.VideoCapabilities cap = null;
if (device.VideoResolution == null)
{
// This device was never connected to in Kinovea, use the first media type.
AForge.Video.DirectShow.VideoCapabilities[] caps = device.VideoCapabilities;
if (caps.Length == 0)
{
log.ErrorFormat("Cannot get any media type for the device.");
return(ImageDescriptor.Invalid);
}
cap = caps[0];
device.SetMediaTypeAndFramerate(cap.Index, (float)cap.AverageFrameRate);
log.DebugFormat("Device set to default configuration: Index:{0}. ({1}x{2} @ {3:0.###} fps ({4})).",
cap.Index, cap.FrameSize.Width, cap.FrameSize.Height, cap.AverageFrameRate, cap.Compression);
}
else
{
cap = device.VideoResolution;
}
int width = cap.FrameSize.Width;
int height = cap.FrameSize.Height;
resultingFramerate = cap.AverageFrameRate;
ImageFormat format = ImageFormat.RGB24;
switch (cap.Compression)
{
case "RGB24":
default:
format = ImageFormat.RGB24;
break;
case "MJPG":
format = ImageFormat.JPEG;
break;
}
int bufferSize = ImageFormatHelper.ComputeBufferSize(width, height, format);
bool topDown = false;
return(new ImageDescriptor(format, width, height, topDown, bufferSize));
}
/// <summary>
/// Configure the device according to what is saved in the preferences for it.
/// </summary>
private void ConfigureDevice()
{
SpecificInfo info = summary.Specific as SpecificInfo;
if (info == null || info.MediaTypeIndex < 0)
{
log.DebugFormat("The device has never been configured in Kinovea.");
return;
}
// Initialize device configuration (Extract and cache media types on the output pin).
// Double check we have an existing index and set the format.
AForge.Video.DirectShow.VideoCapabilities[] capabilities = device.VideoCapabilities;
AForge.Video.DirectShow.VideoCapabilities match = capabilities.FirstOrDefault(c => c.Index == info.MediaTypeIndex);
if (match == null)
{
log.ErrorFormat("Could not match the saved media type.");
return;
}
device.SetMediaTypeAndFramerate(info.MediaTypeIndex, info.SelectedFramerate);
log.DebugFormat("Device set to saved configuration: Index:{0}. ({1}×{2} @ {3:0.###} fps ({4})).",
info.MediaTypeIndex, match.FrameSize.Width, match.FrameSize.Height, info.SelectedFramerate, match.Compression);
// Reload camera properties in case the firmware "forgot" them.
// This means changes done in other softwares will be overwritten.
try
{
CameraPropertyManager.Write(device, info.CameraProperties);
}
catch
{
log.ErrorFormat("An error occured while reloading camera properties.");
}
}
