Gst.TypeFindFactory

const Gst = imports.gi.Gst;

let type_find_factory = new Gst.TypeFindFactory();
  

These functions allow querying informations about registered typefind functions. How to create and register these functions is described in the section <link linkend="gstreamer-Writing-typefind-functions"> "Writing typefind functions"</link>.

<example> <title>how to write a simple typefinder</title> <programlisting> 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 &gt;= 0 &amp;&amp; offset + size &lt;= find->size) { return find->data + offset; } return NULL; } static void my_suggest (gpointer data, guint probability, GstCaps *caps) { MyTypeFind *find = (MyTypeFind *) data; if (probability &gt; find->probability) { find->probability = probability; gst_caps_replace (&amp;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, &amp;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, &amp;gst_find); } g_list_free (type_list); return find.caps; }; </programlisting> </example>

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)