Hi,
I'm trying to use gstreamer plugin appsink and setup its callbacks using
set_callbacks method. Main parameter of this method is AppSinkCallbacks
class, which is the main problem for me. I need to setup callbacks, but I
really don't know how to do it in vala. Here are two examples of what I was
trying, both don't compile:
1)
public static int main (string[] args) {
//Gst.AppSinkCallbacks cbks;
var cbks = new Gst.AppSinkCallbacks();
return 0;
}
gives:
`Gst.AppSinkCallbacks' does not have a default constructor
|| var cbks = new Gst.AppSinkCallbacks();
2)
void eos_cb() {
stdout.printf(eos_cb\n);
}
public static int main (string[] args) {
Gst.AppSinkCallbacks cbks;
cbks.eos = eos_cb;
return 0;
}
gives:
use of possibly unassigned local variable `cbks'
|| cbks.eos = eos_cb;
AppSinkCallbacks is declared in gstreamer-app-0.10.vapi as:
[Compact]
[CCode (cheader_filename = gst/app/gstappsink.h)]
public class AppSinkCallbacks {
public weak GLib.Callback eos;
public weak GLib.Callback new_buffer;
public weak GLib.Callback new_buffer_list;
public weak GLib.Callback new_preroll;
}
and in gstreamer-plugins-base C code as:
typedef struct {
void (*eos) (GstAppSink *sink, gpointer user_data);
GstFlowReturn (*new_preroll) (GstAppSink *sink, gpointer user_data);
GstFlowReturn (*new_buffer) (GstAppSink *sink, gpointer user_data);
GstFlowReturn (*new_buffer_list) (GstAppSink *sink, gpointer user_data);
/* private */
gpointer _gst_reserved[GST_PADDING - 1];
} GstAppSinkCallbacks;
I'm using vala 0.8.1.
What is a correct way of using AppSinkCallbacks?
Thanks for any help or reply.
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