# GstTypeFindFactory

These functions allow querying information about registered typefind functions. How to create and register these functions is described in the section "Writing typefind functions".

The following 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.

       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;
       };

## GstTypeFindFactory

    GObject
        ╰──GInitiallyUnowned
            ╰──GstObject
                ╰──GstPluginFeature
                    ╰──GstTypeFindFactory

Opaque object that stores information about a typefind function.

### Class structure

#### GstTypeFindFactoryClass

### Gst.TypeFindFactoryClass

## GstTypeFindFactory

    GObject
        ╰──GInitiallyUnowned
            ╰──GstObject
                ╰──GstPluginFeature
                    ╰──GstTypeFindFactory

Opaque object that stores information about a typefind function.

## GstTypeFindFactory

    GObject
        ╰──GInitiallyUnowned
            ╰──GstObject
                ╰──GstPluginFeature
                    ╰──GstTypeFindFactory

Opaque object that stores information about a typefind function.

### Methods

#### gst_type_find_factory_call_function

    gst_type_find_factory_call_function (GstTypeFindFactory * factory,
                                         GstTypeFind * find)

Calls the GstTypeFindFunction associated with this factory.

Parameters:

`factory` –

A GstTypeFindFactory

`find` ( [transfer: none] ) –

a properly setup GstTypeFind entry. The get_data and suggest_type members must be set.

#### Gst.TypeFindFactory.prototype.call_function

    function Gst.TypeFindFactory.prototype.call_function(find: Gst.TypeFind): {
        // javascript wrapper for 'gst_type_find_factory_call_function'
    }

Calls the Gst.TypeFindFunction associated with this factory.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

`find` ( Gst.TypeFind ) –

a properly setup Gst.TypeFind entry. The get_data and suggest_type members must be set.

#### Gst.TypeFindFactory.call_function

    def Gst.TypeFindFactory.call_function (self, find):
        #python wrapper for 'gst_type_find_factory_call_function'

Calls the Gst.TypeFindFunction associated with this factory.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

`find` ( Gst.TypeFind ) –

a properly setup Gst.TypeFind entry. The get_data and suggest_type members must be set.

#### gst_type_find_factory_get_caps

    GstCaps *
    gst_type_find_factory_get_caps (GstTypeFindFactory * factory)

Gets the GstCaps associated with a typefind factory.

Parameters:

`factory` –

A GstTypeFindFactory

Returns ( [transfer: none] ) –

the GstCaps associated with this factory

#### Gst.TypeFindFactory.prototype.get_caps

    function Gst.TypeFindFactory.prototype.get_caps(): {
        // javascript wrapper for 'gst_type_find_factory_get_caps'
    }

Gets the Gst.Caps associated with a typefind factory.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

Returns ( Gst.Caps ) –

the Gst.Caps associated with this factory

#### Gst.TypeFindFactory.get_caps

    def Gst.TypeFindFactory.get_caps (self):
        #python wrapper for 'gst_type_find_factory_get_caps'

Gets the Gst.Caps associated with a typefind factory.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

Returns ( Gst.Caps ) –

the Gst.Caps associated with this factory

#### gst_type_find_factory_get_extensions

    const gchar*const **
    gst_type_find_factory_get_extensions (GstTypeFindFactory * factory)

Gets the extensions associated with a GstTypeFindFactory. The returned array should not be changed. If you need to change stuff in it, you should copy it using g_strdupv. This function may return NULL to indicate a 0-length list.

Parameters:

`factory` –

A GstTypeFindFactory

Returns –

(transfer none) (array zero-terminated=1) (element-type utf8) (nullable): a NULL-terminated array of extensions associated with this factory

#### Gst.TypeFindFactory.prototype.get_extensions

    function Gst.TypeFindFactory.prototype.get_extensions(): {
        // javascript wrapper for 'gst_type_find_factory_get_extensions'
    }

Gets the extensions associated with a Gst.TypeFindFactory. The returned array should not be changed. If you need to change stuff in it, you should copy it using g_strdupv (not introspectable). This function may return null to indicate a 0-length list.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

Returns ( [ String ] ) –

(transfer none) (array zero-terminated=1) (element-type utf8) (nullable): a null-terminated array of extensions associated with this factory

#### Gst.TypeFindFactory.get_extensions

    def Gst.TypeFindFactory.get_extensions (self):
        #python wrapper for 'gst_type_find_factory_get_extensions'

Gets the extensions associated with a Gst.TypeFindFactory. The returned array should not be changed. If you need to change stuff in it, you should copy it using g_strdupv (not introspectable). This function may return None to indicate a 0-length list.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

Returns ( [ str ] ) –

(transfer none) (array zero-terminated=1) (element-type utf8) (nullable): a None-terminated array of extensions associated with this factory

#### gst_type_find_factory_has_function

    gboolean
    gst_type_find_factory_has_function (GstTypeFindFactory * factory)

Check whether the factory has a typefind function. Typefind factories without typefind functions are a last-effort fallback mechanism to e.g. assume a certain media type based on the file extension.

Parameters:

`factory` –

A GstTypeFindFactory

Returns –

TRUE if the factory has a typefind functions set, otherwise FALSE

#### Gst.TypeFindFactory.prototype.has_function

    function Gst.TypeFindFactory.prototype.has_function(): {
        // javascript wrapper for 'gst_type_find_factory_has_function'
    }

Check whether the factory has a typefind function. Typefind factories without typefind functions are a last-effort fallback mechanism to e.g. assume a certain media type based on the file extension.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

Returns ( Number ) –

true if the factory has a typefind functions set, otherwise false

#### Gst.TypeFindFactory.has_function

    def Gst.TypeFindFactory.has_function (self):
        #python wrapper for 'gst_type_find_factory_has_function'

Check whether the factory has a typefind function. Typefind factories without typefind functions are a last-effort fallback mechanism to e.g. assume a certain media type based on the file extension.

Parameters:

`factory` ( Gst.TypeFindFactory ) –

A Gst.TypeFindFactory

Returns ( bool ) –

True if the factory has a typefind functions set, otherwise False

### Functions

#### gst_type_find_factory_get_list

    GList *
    gst_type_find_factory_get_list ()

Gets the list of all registered typefind factories. You must free the list using gst_plugin_feature_list_free.

The returned factories are sorted by highest rank first, and then by factory name.

Free-function: gst_plugin_feature_list_free

Returns ( [transfer: full] [element-type Gst.TypeFindFactory] ) –

the list of all registered GstTypeFindFactory.

#### Gst.TypeFindFactory.prototype.get_list

    function Gst.TypeFindFactory.prototype.get_list(): {
        // javascript wrapper for 'gst_type_find_factory_get_list'
    }

Gets the list of all registered typefind factories. You must free the list using Gst.PluginFeature.prototype.list_free.

The returned factories are sorted by highest rank first, and then by factory name.

Free-function: gst_plugin_feature_list_free

Returns ( [ Gst.TypeFindFactory ] ) –

the list of all registered Gst.TypeFindFactory.

#### Gst.TypeFindFactory.get_list

    def Gst.TypeFindFactory.get_list ():
        #python wrapper for 'gst_type_find_factory_get_list'

Gets the list of all registered typefind factories. You must free the list using Gst.PluginFeature.list_free.

The returned factories are sorted by highest rank first, and then by factory name.

Free-function: gst_plugin_feature_list_free

Returns ( [ Gst.TypeFindFactory ] ) –

the list of all registered Gst.TypeFindFactory.

The results of the search are