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caps: Optimize gst_caps_is_subset()

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..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 and doesn't
break the -base unit tests are anything anymore.
This commit is contained in:
Sebastian Dröge 2011-05-27 13:38:51 +02:00
parent 0cf2dfd0ba
commit d98e9acb0f
2 changed files with 45 additions and 5 deletions
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26
gst/gstcaps.c
View file

@ -1131,8 +1131,9 @@ 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);
@ -1142,9 +1143,24 @@ 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;
}

24
tests/check/gst/gstcaps.c
View file

@ -348,6 +348,29 @@ GST_START_TEST (test_truncate)
GST_END_TEST;
GST_START_TEST (test_subset)
{
GstCaps *c1, *c2;
c1 = gst_caps_from_string ("video/x-raw-yuv; video/x-raw-rgb");
c2 = gst_caps_from_string ("video/x-raw-yuv, format=(fourcc)YUY2");
fail_unless (gst_caps_is_subset (c2, c1));
fail_if (gst_caps_is_subset (c1, c2));
gst_caps_unref (c1);
gst_caps_unref (c2);
c1 = gst_caps_from_string
("audio/x-raw-int, channels=(int)[ 1, 2 ], rate=(int)44100");
c2 = gst_caps_from_string
("audio/x-raw-int, channels=(int)1, rate=(int)44100");
fail_unless (gst_caps_is_subset (c2, c1));
fail_if (gst_caps_is_subset (c1, c2));
gst_caps_unref (c1);
gst_caps_unref (c2);
}
GST_END_TEST;
GST_START_TEST (test_merge_fundamental)
{
GstCaps *c1, *c2;
@ -951,6 +974,7 @@ gst_caps_suite (void)
tcase_add_test (tc_chain, test_static_caps);
tcase_add_test (tc_chain, test_simplify);
tcase_add_test (tc_chain, test_truncate);
tcase_add_test (tc_chain, test_subset);
tcase_add_test (tc_chain, test_merge_fundamental);
tcase_add_test (tc_chain, test_merge_same);
tcase_add_test (tc_chain, test_merge_subset);