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videoscale: Optimize transform_caps()

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If the second and next caps structures are a subset of the already existing
transformed caps we can safely skip them because we would transform them to
the same caps again.
This commit is contained in:
Sebastian Dröge 2011-05-27 14:30:19 +02:00
parent da4e79bb6b
commit 0c99ab5806
1 changed files with 9 additions and 5 deletions
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14
gst/videoscale/gstvideoscale.c
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@ -328,18 +328,21 @@ gst_video_scale_transform_caps (GstBaseTransform * trans,
GstStructure *structure;
gint i, n;
/* this function is always called with a simple caps */
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL);
GST_DEBUG_OBJECT (trans,
"Transforming caps %" GST_PTR_FORMAT " in direction %s", caps,
(direction == GST_PAD_SINK) ? "sink" : "src");
ret = gst_caps_copy (caps);
ret = gst_caps_new_empty ();
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
structure = gst_caps_get_structure (ret, i);
structure = gst_caps_get_structure (caps, i);
/* If this is already expressed by the existing caps
* skip this structure */
if (i > 0 && gst_caps_is_subset_structure (ret, structure))
continue;
structure = gst_structure_copy (structure);
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
"height", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
@ -349,6 +352,7 @@ gst_video_scale_transform_caps (GstBaseTransform * trans,
gst_structure_set (structure, "pixel-aspect-ratio",
GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1, NULL);
}
gst_caps_append_structure (ret, structure);
}
if (filter) {