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GStreamer 0.10 Core Reference Manual | ![]() |
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Top | Description | Object Hierarchy |
#include <gst/gst.h> struct GstTypeFindFactory; GList * gst_type_find_factory_get_list (void
); gchar ** gst_type_find_factory_get_extensions (GstTypeFindFactory *factory
); GstCaps * gst_type_find_factory_get_caps (GstTypeFindFactory *factory
); void gst_type_find_factory_call_function (GstTypeFindFactory *factory
,GstTypeFind *find
);
These functions allow querying informations about registered typefind
functions. How to create and register these functions is described in
the section
Example 17. how to write a simple typefinder
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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)
struct GstTypeFindFactory;
Object that stores information about a typefind function.
GList * gst_type_find_factory_get_list (void
);
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. (behaviour change since 0.10.26)
Free-function: gst_plugin_feature_list_free
Returns : |
the list of all registered GstTypeFindFactory. [transfer full][element-type Gst.TypeFindFactory] |
gchar ** 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.
|
A GstTypeFindFactory |
Returns : |
a NULL-terminated array of extensions associated with this factory. [transfer none][array zero-terminated=1][element-type utf8] |
GstCaps * gst_type_find_factory_get_caps (GstTypeFindFactory *factory
);
Gets the GstCaps associated with a typefind factory.
|
A GstTypeFindFactory |
Returns : |
the GstCaps associated with this factory. [transfer none] |
void gst_type_find_factory_call_function (GstTypeFindFactory *factory
,GstTypeFind *find
);
Calls the GstTypeFindFunction associated with this factory.
|
A GstTypeFindFactory |
|
a properly setup GstTypeFind entry. The get_data and suggest_type members must be set. [transfer none] |