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 >= 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;
   };

GstTypeFindFactory

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

Opaque object that stores information about a typefind function.


Class structure

GstTypeFindFactoryClass


Gst.TypeFindFactoryClass


Gst.TypeFindFactoryClass


Gst.TypeFindFactory

GObject.Object
    ╰──GObject.InitiallyUnowned
        ╰──Gst.Object
            ╰──Gst.PluginFeature
                ╰──Gst.TypeFindFactory

Opaque object that stores information about a typefind function.


Gst.TypeFindFactory

GObject.Object
    ╰──GObject.InitiallyUnowned
        ╰──Gst.Object
            ╰──Gst.PluginFeature
                ╰──Gst.TypeFindFactory

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:

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:

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][nullable])

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:

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:

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:

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:

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:

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:

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-typeGst.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.


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