Re: GTK drawing + Gstreamer

[Paul Davis <paul linuxaudiosystems com>]

On Thu, Mar 19, 2009 at 12:24 PM, Matteo Landi <matteo landi email it> wrote:

Hi all,
i'm trying to develop a basic image processing that sources the
frames from the webcam.
Basically the gtk application is composed of three windows:
1 - drawing area displaying modified stream
2 - drawing area displaying the webcam stream (i used an xoverlay
 for the link between the gstreamer videosink and the drawing area)
3 - box containing settings for the webcam stream

I have a gst object that everytime it has a new frame, launch a callback
function. Inside this method i make the image process, and save the
result inside a gdk_pixbuff. Once the process is terminated, inside the
function, i call gdk_draw_pixbuf over the first drawing area. Is it correct to
draw over drawing areas from gstreamer callbacks?

no. you really can't call anything except g_idle_add() without taking the gtk thread lock. if you take the lock, you can call gtk_widget_queue_draw() and then the right things will happen.