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<html>
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<head>
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<title>GstTypeFindFactory: GStreamer 1.0 Core Reference Manual</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top  | 
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                  Description  | 
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                  Object Hierarchy
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Home
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Up
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Prev
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Next
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GstTypeFindFactory
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GstTypeFindFactory — Information about registered typefind functions
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Functions
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GList *
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gst_type_find_factory_get_list ()
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const gchar * const *
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gst_type_find_factory_get_extensions ()
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GstCaps *
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gst_type_find_factory_get_caps ()
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gboolean
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gst_type_find_factory_has_function ()
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void
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gst_type_find_factory_call_function ()
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Types and Values
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GstTypeFindFactory
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Object Hierarchy
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    GObject
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    ╰── GInitiallyUnowned
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        ╰── GstObject
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            ╰── GstPluginFeature
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                ╰── GstTypeFindFactory
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Includes
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#include <gst/gstprotection.h>
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Description
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These functions allow querying informations about registered typefind
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functions. How to create and register these functions is described in
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the section <GTKDOCLINK HREF="gstreamer-Writing-typefind-functions">
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"Writing typefind functions"</GTKDOCLINK>.
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The following example shows how to write a very simple typefinder that
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identifies the given data. You can get quite a bit more complicated than
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that though.
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typedef struct {
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  guint8 *data;
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  guint size;
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  guint probability;
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  GstCaps *data;
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} MyTypeFind;
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static void
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my_peek (gpointer data, gint64 offset, guint size)
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{
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  MyTypeFind *find = (MyTypeFind *) data;
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  if (offset >= 0 && offset + size <= find->size) {
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    return find->data + offset;
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  }
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  return NULL;
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}
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static void
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my_suggest (gpointer data, guint probability, GstCaps *caps)
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{
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  MyTypeFind *find = (MyTypeFind *) data;
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  if (probability > find->probability) {
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    find->probability = probability;
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    gst_caps_replace (&find->caps, caps);
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  }
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}
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static GstCaps *
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find_type (guint8 *data, guint size)
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{
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  GList *walk, *type_list;
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  MyTypeFind find = {data, size, 0, NULL};
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  GstTypeFind gst_find = {my_peek, my_suggest, &find, };
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  walk = type_list = gst_type_find_factory_get_list ();
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  while (walk) {
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    GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
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    walk = g_list_next (walk)
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    gst_type_find_factory_call_function (factory, &gst_find);
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  }
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  g_list_free (type_list);
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  return find.caps;
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};
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Functions
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gst_type_find_factory_get_list ()
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GList *
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gst_type_find_factory_get_list (void);
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Gets the list of all registered typefind factories. You must free the
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list using gst_plugin_feature_list_free().
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The returned factories are sorted by highest rank first, and then by
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factory name.
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Free-function: gst_plugin_feature_list_free
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Returns
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the list of all
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registered GstTypeFindFactory.
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[transfer full][element-type Gst.TypeFindFactory]
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gst_type_find_factory_get_extensions ()
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const gchar * const *
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gst_type_find_factory_get_extensions (GstTypeFindFactory *factory);
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Gets the extensions associated with a GstTypeFindFactory. The returned
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array should not be changed. If you need to change stuff in it, you should
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copy it using g_strdupv().  This function may return NULL to indicate
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a 0-length list.
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Parameters
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factory
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A GstTypeFindFactory
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Returns
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a NULL-terminated array of extensions associated with this factory.
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[transfer none][array zero-terminated=1][element-type utf8][nullable]
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gst_type_find_factory_get_caps ()
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GstCaps *
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gst_type_find_factory_get_caps (GstTypeFindFactory *factory);
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Gets the GstCaps associated with a typefind factory.
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Parameters
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factory
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A GstTypeFindFactory
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Returns
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the GstCaps associated with this factory.
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[transfer none]
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gst_type_find_factory_has_function ()
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gboolean
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gst_type_find_factory_has_function (GstTypeFindFactory *factory);
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Check whether the factory has a typefind function. Typefind factories
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without typefind functions are a last-effort fallback mechanism to
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e.g. assume a certain media type based on the file extension.
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Parameters
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factory
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A GstTypeFindFactory
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Returns
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 TRUE if the factory has a typefind functions set, otherwise FALSE
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gst_type_find_factory_call_function ()
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void
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gst_type_find_factory_call_function (GstTypeFindFactory *factory,
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                                     GstTypeFind *find);
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Calls the GstTypeFindFunction associated with this factory.
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Parameters
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factory
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A GstTypeFindFactory
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find
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a properly setup GstTypeFind entry. The get_data
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and suggest_type members must be set.
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[transfer none]
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Types and Values
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GstTypeFindFactory
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typedef struct _GstTypeFindFactory GstTypeFindFactory;
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Opaque object that stores information about a typefind function.
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