[Sugar-devel] getting image from gStreamer

[Gonzalo Odiard]

I think yoou should get the photo data from the gstreamer side,
not from the widget where you are displaying it.
If you look at the Record activity code,
the logic used to take the photo is in glive.py take_photo method,
and adding a sink to a tee in the gstreamer pipeline,
and getting the data from there (_photo_handoff method)

Gonzalo


On Mon, Jul 21, 2014 at 2:50 AM, James Cameron <quozl at laptop.org> wrote:

> On Mon, Jul 21, 2014 at 11:14:16AM +0530, Puneet Kaur wrote:
> >
> >
> >
> > On Mon, Jul 21, 2014 at 10:56 AM, James Cameron <quozl at laptop.org>
> wrote:
> >
> >     On Mon, Jul 21, 2014 at 02:07:15AM +0530, Puneet Kaur wrote:
> >     > Hey all,
> >     >
> >     > I was able to get the webcam stream using gStreamer through this :
> >     >
> >     >         self.src = Gst.ElementFactory.make('autovideosrc', None)
> >     >         self.sink = Gst.ElementFactory.make('autovideosink', None)
> >     >
> >     >         (and more related corde...)
> >
> >     Good.
> >
> >     > but how to modify in order to store the image (on click) to a file
> /
> >     buffer ?
> >     >
> >     > I tried :
> >     >
> >     > 1)     gdk_display = GdkX11.X11Display.get_default()
> >     >         gdk_window = GdkX11.X11Window.foreign_new_for_display
> >     (gdk_display,self.xid)
> >
> >
> > the above two lines for fetching gdk window from a given xid
> >
> >
> >     >         width = gdk_window.get_width()
> >     >         height = gdk_window.get_height()
> >
> >
> > width and height of the gdk window
> >
> >
> >     >         ims = cairo.ImageSurface(cairo.FORMAT_ARGB32, width,
> height)
> >
> >
> > make a cairo surface
> >
> >
> >     >         pb = Gdk.pixbuf_get_from_window(gdk_window, 0, 0, width,
> height)
> >
> >
> > get the pixbuf from the gdk window
> >
> >
> >     >         cr = cairo.Context(ims)
> >
> >
> > set the cairo context
> >
> >
> >
> >     >         Gdk.cairo_set_source_pixbuf(cr, pb, 0, 0)
> >
> >
> > set cairo source
> >
> >
> >     >         cr.paint()
> >
> >
> >
> > paint on the cairo context and then save the surface by :
> ims.write_to_png
> > ('testimage'+self.snapshot_name()+'.png')
> >
> >
> >
> >
> >     How are you copying the camera image to the surface?  I can't see how
> >     you do that in the above example.
> >
> >
> >
> > ^
>
> Sorry, I don't understand.  Yes, I agree with the comments you added
> to the code, but I don't see how you are copying the camera image to
> the surface.  As far as I can tell, you _must_ end up with a blank
> surface if you don't put anything on it.
>
> --
> James Cameron
> http://quozl.linux.org.au/
> _______________________________________________
> Sugar-devel mailing list
> Sugar-devel at lists.sugarlabs.org
> http://lists.sugarlabs.org/listinfo/sugar-devel
>



-- 
Gonzalo Odiard

SugarLabs - Software for children learning
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