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pad: add GST_PAD_FLAG_ACCEPT_TEMPLATE

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It will make the default accept-caps handler use the pad template
caps instead of the query-caps result to check if the caps is
acceptable. This is aligned with what the design docs says the
accept-caps should do (be non-recursive) and should be faster. It
is *not* enabled by default, though.

API: GST_PAD_FLAG_ACCEPT_TEMPLATE
API: GST_PAD_IS_ACCEPT_TEMPLATE
API: GST_PAD_SET_ACCEPT_TEMPLATE
API: GST_PAD_UNSET_ACCEPT_TEMPLATE

https://bugzilla.gnome.org/show_bug.cgi?id=753623
This commit is contained in:
Thiago Santos 2015-08-14 07:51:07 -03:00
parent f2a26f2bd7
commit b76ecfd992
2 changed files with 41 additions and 1 deletions
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3
gst/gstpad.c
View file

@ -2972,6 +2972,9 @@ gst_pad_query_accept_caps_default (GstPad * pad, GstQuery * query)
"fallback ACCEPT_CAPS query, consider implementing a specialized version");
gst_query_parse_accept_caps (query, &caps);
if (GST_PAD_IS_ACCEPT_TEMPLATE (pad))
allowed = gst_pad_get_pad_template_caps (pad);
else
allowed = gst_pad_query_caps (pad, caps);
if (allowed) {

37
gst/gstpad.h
View file

@ -631,6 +631,10 @@ typedef gboolean (*GstPadStickyEventsForeachFunction) (GstPad *pad, GstEvent **
* it the caps intersect the query-caps result instead
* of checking for a subset. This is interesting for
* parsers that can accept incompletely specified caps.
* @GST_PAD_FLAG_ACCEPT_TEMPLATE: the default accept-caps handler will use
* the template pad caps instead of query caps to
* compare with the accept caps. Use this in combination
* with %GST_PAD_FLAG_ACCEPT_INTERSECT. (Since 1.6)
* @GST_PAD_FLAG_LAST: offset to define more flags
*
* Pad state flags
@ -648,6 +652,7 @@ typedef enum {
GST_PAD_FLAG_PROXY_ALLOCATION = (GST_OBJECT_FLAG_LAST << 9),
GST_PAD_FLAG_PROXY_SCHEDULING = (GST_OBJECT_FLAG_LAST << 10),
GST_PAD_FLAG_ACCEPT_INTERSECT = (GST_OBJECT_FLAG_LAST << 11),
GST_PAD_FLAG_ACCEPT_TEMPLATE = (GST_OBJECT_FLAG_LAST << 12),
/* padding */
GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 16)
} GstPadFlags;
@ -1116,6 +1121,38 @@ struct _GstPadClass {
* Unset accept intersect flag.
*/
#define GST_PAD_UNSET_ACCEPT_INTERSECT(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_ACCEPT_INTERSECT))
/**
* GST_PAD_IS_ACCEPT_TEMPLATE:
* @pad: a #GstPad
*
* Check if the pad's accept caps operation will use the pad template caps.
* The default accept-caps will do a query caps to get the caps, which might
* be querying downstream causing unnecessary overhead. It is recommended to
* implement a proper accept-caps query handler or to use this flag to prevent
* recursive accept-caps handling.
*
* Since: 1.6
*/
#define GST_PAD_IS_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
/**
* GST_PAD_SET_ACCEPT_TEMPLATE:
* @pad: a #GstPad
*
* Set @pad to by default use the pad template caps to compare with
* the accept caps instead of using a caps query result.
*
* Since: 1.6
*/
#define GST_PAD_SET_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
/**
* GST_PAD_UNSET_ACCEPT_TEMPLATE:
* @pad: a #GstPad
*
* Unset accept template flag.
*
* Since: 1.6
*/
#define GST_PAD_UNSET_ACCEPT_TEMPLATE(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_ACCEPT_TEMPLATE))
/**
* GST_PAD_GET_STREAM_LOCK:
* @pad: a #GstPad