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implement gst_bin_get_(all_)by_interface

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Original commit message from CVS:
implement gst_bin_get_(all_)by_interface
This commit is contained in:
Benjamin Otte 2003-12-16 19:35:26 +00:00
parent 54d54fac0c
commit 9195d5bf8e
2 changed files with 73 additions and 0 deletions
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71
gst/gstbin.c
View file

@ -891,6 +891,77 @@ gst_bin_get_list (GstBin * bin)
return bin->children;
}
/**
* gst_bin_get_by_interface:
* @bin: bin to find element in
* @interface: interface to be implemented by interface
*
* Looks for the first element inside the bin that implements the given
* interface. If such an element is found, it returns the element. You can
* cast this element to the given interface afterwards.
* If you want all elements that implement the interface, use
* gst_bin_get_all_by_interface(). The function recurses bins inside bins.
*
* Returns: An element inside the bin implementing the interface.
*/
GstElement *
gst_bin_get_by_interface (GstBin *bin, const GType interface)
{
GList *walk;
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface), NULL);
walk = bin->children;
while (walk) {
if (G_TYPE_CHECK_INSTANCE_TYPE (walk->data, interface))
return GST_ELEMENT (walk->data);
if (GST_IS_BIN (walk->data)) {
GstElement *ret;
ret = gst_bin_get_by_interface (GST_BIN (walk->data), interface);
if (ret)
return ret;
}
walk = g_list_next (walk);
}
return NULL;
}
/**
* gst_bin_get_all_by_interface:
* @bin: bin to find elements in
* @interface: interface to be implemented by interface
*
* Looks for all element inside the bin that implements the given
* interface. You can safely cast all returned elements to the given interface.
* The function recurses bins inside bins. You need to free the list using
* g_list_free() after use.
*
* Returns: An element inside the bin implementing the interface.
*/
GList *
gst_bin_get_all_by_interface (GstBin *bin, const GType interface)
{
GList *walk, *ret = NULL;
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
g_return_val_if_fail (G_TYPE_IS_INTERFACE (interface), NULL);
walk = bin->children;
while (walk) {
if (G_TYPE_CHECK_INSTANCE_TYPE (walk->data, interface))
ret = g_list_prepend (ret, walk->data);
if (GST_IS_BIN (walk->data)) {
ret = g_list_concat (ret,
gst_bin_get_all_by_interface (GST_BIN (walk->data), interface));
}
walk = g_list_next (walk);
}
return ret;
}
/**
* gst_bin_sync_children_state:
* @bin: #Gstbin to sync state

2
gst/gstbin.h
View file

@ -103,6 +103,8 @@ GstElement* gst_bin_get_by_name (GstBin *bin, const gchar *name);
GstElement* gst_bin_get_by_name_recurse_up (GstBin *bin, const gchar *name);
G_CONST_RETURN GList*
gst_bin_get_list (GstBin *bin);
GstElement* gst_bin_get_by_interface (GstBin *bin, const GType interface);
GList * gst_bin_get_all_by_interface (GstBin *bin, const GType interface);
gboolean gst_bin_iterate (GstBin *bin);