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tools: print "pad-added", "pad-removed" and "no-more-pads" signals for elements with sometimes pads

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It's often not obvious to people that elements like e.g. uridecodebin
(or demuxers) automatically support the standard signals of the
GstElement class, so let's print the useful pad-related ones for
elements with sometimes pads.
This commit is contained in:
Tim-Philipp Müller 2011-02-28 14:56:23 +00:00
parent c7881a21b5
commit b923b7f901
1 changed files with 27 additions and 5 deletions
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32
tools/gst-inspect.c
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@ -880,13 +880,19 @@ print_pad_info (GstElement * element)
}
}
#if 0
static gint
compare_signal_names (GSignalQuery * a, GSignalQuery * b)
static gboolean
has_sometimes_template (GstElement * element)
{
return strcmp (a->signal_name, b->signal_name);
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
GList *l;
for (l = klass->padtemplates; l != NULL; l = l->next) {
if (GST_PAD_TEMPLATE (l->data)->presence == GST_PAD_SOMETIMES)
return TRUE;
}
return FALSE;
}
#endif
static void
print_signal_info (GstElement * element)
@ -901,6 +907,22 @@ print_signal_info (GstElement * element)
for (k = 0; k < 2; k++) {
found_signals = NULL;
/* For elements that have sometimes pads, also list a few useful GstElement
* signals. Put these first, so element-specific ones come later. */
if (k == 0 && has_sometimes_template (element)) {
query = g_new0 (GSignalQuery, 1);
g_signal_query (g_signal_lookup ("pad-added", GST_TYPE_ELEMENT), query);
found_signals = g_slist_append (found_signals, query);
query = g_new0 (GSignalQuery, 1);
g_signal_query (g_signal_lookup ("pad-removed", GST_TYPE_ELEMENT), query);
found_signals = g_slist_append (found_signals, query);
query = g_new0 (GSignalQuery, 1);
g_signal_query (g_signal_lookup ("no-more-pads", GST_TYPE_ELEMENT),
query);
found_signals = g_slist_append (found_signals, query);
}
for (type = G_OBJECT_TYPE (element); type; type = g_type_parent (type)) {
if (type == GST_TYPE_ELEMENT || type == GST_TYPE_OBJECT)
break;