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GStreamer 0.10 Core Reference Manual | |
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#include <gst/gst.h> gboolean (*GstFilterFunc) (gpointer obj, gpointer user_data); GList* gst_filter_run (const GList *list, GstFilterFunc func, gboolean first, gpointer user_data);
Example 12. Filtering a list
GList *node;
GstObject *result = NULL;
node = gst_filter_run (list, (GstFilterFunc) my_filter, TRUE, NULL);
if (node) {
result = GST_OBJECT (node->data);
gst_object_ref (result);
gst_list_free (node);
}
gboolean (*GstFilterFunc) (gpointer obj,
gpointer user_data);
Function prototype for a filter callback taht can be use in gst_filter_run().
The function should apply its filtering to obj. Additional data passed to
gst_filter_run() are in data.
obj : |
the object |
user_data : |
filter data |
| Returns : | TRUE for success.
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GList* gst_filter_run (const GList *list,
GstFilterFunc func,
gboolean first,
gpointer user_data);
Iterates over the elements in list, calling func with the
list item data for each item. If func returns TRUE, data is
prepended to the list of results returned. If first is true,
the search is halted after the first result is found.
Since gst_filter_run() knows nothing about the type of data, no
reference will be taken (if data refers to an object) and no copy of
data wil be made in any other way when prepending data to the list of
results.
list : |
a linked list |
func : |
the function to execute for each item |
first : |
flag to stop execution after a successful item |
user_data : |
user data |
| Returns : | the list of results. Free with g_list_free() when no longer needed
(the data contained in the list is a flat copy and does need to be
unreferenced or freed).
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