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caps: Merge structures when intersecting instead of appending them

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This prevents adding duplicates over and over again to the resulting
caps if they already describe the new intersection result.

While this changes intersection from O(n*m) to O(n^2*m), it results in
smaller caps, which in the end will decrease further processing times.

For example in an audioconvert ! audioconvert ! audioconvert pipeline,
when forwarding the downstream caps preference in basetransform
(see e26da72de25a91c3eaad9f7c8b2f53ba888a0394) this results in
16 instead of 191 caps structures.
This commit is contained in:
Sebastian Dröge 2011-05-05 11:28:38 +02:00
parent aebe4a3c13
commit dc63e38219
2 changed files with 21 additions and 2 deletions
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4
gst/gstcaps.c
View file

@ -1361,7 +1361,7 @@ gst_caps_intersect_zig_zag (const GstCaps * caps1, const GstCaps * caps2)
istruct = gst_caps_structure_intersect (struct1, struct2);
gst_caps_append_structure (dest, istruct);
gst_caps_merge_structure (dest, istruct);
/* move down left */
k++;
if (G_UNLIKELY (j == 0))
@ -1420,7 +1420,7 @@ gst_caps_intersect_first (const GstCaps * caps1, const GstCaps * caps2)
struct2 = gst_caps_get_structure_unchecked (caps2, j);
istruct = gst_caps_structure_intersect (struct1, struct2);
if (istruct)
gst_caps_append_structure (dest, istruct);
gst_caps_merge_structure (dest, istruct);
}
}

19
tests/check/gst/gstcaps.c
View file

@ -811,6 +811,24 @@ GST_START_TEST (test_intersect_first2)
GST_END_TEST;
GST_START_TEST (test_intersect_duplication)
{
GstCaps *c1, *c2, *test;
c1 = gst_caps_from_string
("audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ]");
c2 = gst_caps_from_string
("audio/x-raw-int, width=(int)16, depth=(int)16, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ], endianness=(int){ 1234, 4321 }, signed=(boolean){ true, false }; audio/x-raw-int, width=(int)16, depth=(int)16, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 11 ], endianness=(int){ 1234, 4321 }, signed=(boolean){ true, false }; audio/x-raw-int, width=(int)16, depth=(int)[ 1, 16 ], rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 11 ], endianness=(int){ 1234, 4321 }, signed=(boolean){ true, false }");
test = gst_caps_intersect_full (c1, c2, GST_CAPS_INTERSECT_FIRST);
fail_unless_equals_int (gst_caps_get_size (test), 1);
fail_unless (gst_caps_is_equal (c1, test));
gst_caps_unref (c1);
gst_caps_unref (c2);
gst_caps_unref (test);
}
GST_END_TEST;
static gboolean
_caps_is_fixed_foreach (GQuark field_id, const GValue * value, gpointer unused)
@ -921,6 +939,7 @@ gst_caps_suite (void)
tcase_add_test (tc_chain, test_intersect_zigzag);
tcase_add_test (tc_chain, test_intersect_first);
tcase_add_test (tc_chain, test_intersect_first2);
tcase_add_test (tc_chain, test_intersect_duplication);
tcase_add_test (tc_chain, test_normalize);
tcase_add_test (tc_chain, test_broken);