public cameraDevice(String device, Gst.Fraction framerate, int width, int height)
{
this.device = device;
this.framerate = framerate;
this.width = width;
this.height = height;
}
private static int GreatestCommonDivisor (Fraction fraction) {
int a = fraction.numerator;
int b = fraction.denominator;
while (b != 0) {
int temp = a;
a = b;
b = temp % b;
}
return Math.Abs (a);
}
private void CameraScanWin()
{
Gst.Element e = Gst.ElementFactory.Make ("dshowvideosrc");
Gst.Interfaces.PropertyProbeAdapter ppa = new Gst.Interfaces.PropertyProbeAdapter (e.Handle);
object[] devices = ppa.ProbeAndGetValues ("device-name");
FillCombo (cbxCamera);
foreach (String dev in devices) {
Gst.Caps caps = e.GetStaticPad ("src").Caps;
foreach (Gst.Structure cap in caps) {
if (cap.HasField ("width") && cap.HasField ("height")) {
Gst.GLib.Value s;
int height = 0, width = 0;
s = cap.GetValue ("width");
if (s.Val is int) {
width = (int)s.Val;
}
s = cap.GetValue ("height");
if (s.Val is int) {
height = (int)s.Val;
}
if (width == 320 && height == 240) {
s = cap.GetValue ("framerate");
Gst.Fraction f;
if (s.Val is Gst.FractionRange) {
f = new Gst.FractionRange (s).Max; // ? Min
} else if (s.Val is Gst.Fraction) {
f = new Gst.Fraction (s);
} else if (s.Val is int) {
f = new Gst.Fraction ((int)s.Val, 1);
} else
continue;
cameras [dev] = new GstCapture.cameraDevice (dev, f, width, height);
cbxCamera.AppendText (dev);
}
}
}
}
}
private void CameraScanUnix ()
{
Gst.Element e = Gst.ElementFactory.Make ("v4l2src");
Gst.Interfaces.PropertyProbeAdapter ppa = new Gst.Interfaces.PropertyProbeAdapter (e.Handle);
object[] devices = ppa.ProbeAndGetValues ("device");
FillCombo (cbxCamera);
foreach (String dev in devices) {
Gst.Fraction f = new Gst.Fraction(30,1);
cameras [dev] = new GstCapture.cameraDevice (dev, f , 320 , 240);
cbxCamera.AppendText (dev);
}
}
public FractionRange(GLib.Value val)
: this()
{
IntPtr min_ptr, max_ptr;
GLib.Value min, max;
min_ptr = gst_value_get_fraction_range_min (ref val);
max_ptr = gst_value_get_fraction_range_max (ref val);
min = (GLib.Value)Marshal.PtrToStructure (min_ptr, typeof(GLib.Value));
max = (GLib.Value)Marshal.PtrToStructure (max_ptr, typeof(GLib.Value));
this.Min = (Fraction)min.Val;
this.Max = (Fraction)max.Val;
}
public FractionRange(Fraction min, Fraction max)
{
double a = (double)min, b = (double)max;
if (a > b)
throw new ArgumentException ();
this.Min = min;
this.Max = max;
}
public bool FixateFieldNearestFraction (string field_name, Fraction target) {
return FixateFieldNearestFraction (field_name, target.Numerator, target.Denominator);
}
private void OnCapsSet (object o, Gst.GLib.NotifyArgs args)
{
Structure s = null;
int width, height, fps_n, fps_d, par_n, par_d;
Caps caps = ((Pad)o).NegotiatedCaps;
width = height = fps_n = fps_d = 0;
if (caps == null) {
return;
}
/* Get video decoder caps */
s = caps [0];
if (s != null) {
/* We need at least width/height and framerate */
if (!(s.HasField ("framerate") && s.HasField ("width") && s.HasField ("height"))) {
return;
}
Fraction f = new Fraction (s.GetValue ("framerate"));
fps_n = f.Numerator;
fps_d = f.Denominator;
Gst.GLib.Value val;
width = (int)s.GetValue ("width");
height = (int)s.GetValue ("height");
/* Get the PAR if available */
val = s.GetValue ("pixel-aspect-ratio");
if (!val.Equals (Gst.GLib.Value.Empty)) {
Fraction par = new Fraction (val);
par_n = par.Numerator;
par_d = par.Denominator;
}
else { /* Square pixels */
par_n = 1;
par_d = 1;
}
/* Notify PlayerEngine if a callback was set */
RaiseVideoGeometry (width, height, fps_n, fps_d, par_n, par_d);
}
}
