mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-07-01 12:20:42 +00:00
Code Issues 1 Projects Releases Wiki Activity

caps: Optimize gst_caps_is_subset()

Browse source 
..and as a result gst_caps_is_equal() and others.

This now only checks if for every subset structure there is
a superset structure in the superset caps. Previously we were
subtracting one from another, creating completely new caps
and then even simplified them.

The new implemention now is about 1.27 times faster.
This commit is contained in:
Sebastian Dröge 2011-05-27 12:45:59 +02:00
parent 934faf163c
commit 32248a9b85
1 changed files with 21 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
gst/gstcaps.c
View file

@ -1133,8 +1133,9 @@ gst_caps_is_always_compatible (const GstCaps * caps1, const GstCaps * caps2)
gboolean
gst_caps_is_subset (const GstCaps * subset, const GstCaps * superset)
{
GstCaps *caps;
gboolean ret;
GstStructure *s1, *s2;
gboolean ret = TRUE;
gint i, j;
g_return_val_if_fail (subset != NULL, FALSE);
g_return_val_if_fail (superset != NULL, FALSE);
@ -1144,9 +1145,24 @@ gst_caps_is_subset (const GstCaps * subset, const GstCaps * superset)
if (CAPS_IS_ANY (subset) || CAPS_IS_EMPTY (superset))
return FALSE;
caps = gst_caps_subtract (subset, superset);
ret = CAPS_IS_EMPTY_SIMPLE (caps);
gst_caps_unref (caps);
for (i = subset->structs->len - 1; i >= 0; i--) {
for (j = superset->structs->len - 1; j >= 0; j--) {
s1 = gst_caps_get_structure_unchecked (subset, i);
s2 = gst_caps_get_structure_unchecked (superset, j);
if (gst_caps_structure_is_subset (s2, s1)) {
/* If we found a superset, continue with the next
* subset structure */
break;
}
}
/* If we found no superset for this subset structure
* we return FALSE immediately */
if (j == -1) {
ret = FALSE;
break;
}
}
return ret;
}