These functions allow querying informations about registered typefind functions.
How to create and register these functions is described in the section "Writing typefind
functions".
how to write a simple typefinder:
typedef struct {
guint8 *data;
guint size;
guint probability;
GstCaps *data;
} MyTypeFind;
static void
my_peek (gpointer data, gint64 offset, guint size)
{
MyTypeFind *find = (MyTypeFind *) data;
if (offset >= 0 && offset + size <= find->size) {
return find->data + offset;
}
return NULL;
}
static void
my_suggest (gpointer data, guint probability, GstCaps *caps)
{
MyTypeFind *find = (MyTypeFind *) data;
if (probability > find->probability) {
find->probability = probability;
gst_caps_replace (&find->caps, caps);
}
}
static GstCaps *
find_type (guint8 *data, guint size)
{
GList *walk, *type_list;
MyTypeFind find = {data, size, 0, NULL};
GstTypeFind gst_find = {my_peek, my_suggest, &find, };
walk = type_list = gst_type_find_factory_get_list ();
while (walk) {
GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
walk = g_list_next (walk)
gst_type_find_factory_call_function (factory, &gst_find);
}
g_list_free (type_list);
return find.caps;
};
The above example shows how to write a very simple typefinder that identifies the given data. You can get quite a bit more complicated than
that though.
Last reviewed on 2005-11-09 (0.9.4)
