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Add functions useful default pad_link and fixate functions.

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Original commit message from CVS:
Add functions useful default pad_link and fixate functions.
This commit is contained in:
David Schleef 2003-12-31 08:06:49 +00:00
parent 1933a78c8e
commit 8f8aaf83f4
3 changed files with 95 additions and 0 deletions
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6
ChangeLog
View file

@ -1,3 +1,9 @@
2003-12-31 David Schleef <ds@schleef.org>
* gst/gstpad.c: (gst_pad_proxy_pad_link), (gst_pad_proxy_fixate):
* gst/gstpad.h: Add functions that are useful as default pad
link and fixate functions for elements.
2003-12-30 David Schleef <ds@schleef.org>
* gst/gstpad.c: (gst_pad_link_try):

85
gst/gstpad.c
View file

@ -2013,6 +2013,91 @@ gst_pad_proxy_getcaps (GstPad *pad)
return caps;
}
/**
* gst_pad_proxy_pad_link:
* @pad: a #GstPad to proxy.
*
* Calls gst_pad_try_set_caps() for every other pad belonging to the
* same element as @pad. If gst_pad_try_set_caps() fails on any pad,
* the proxy link fails.
*
* Returns: GST_PAD_LINK_OK if sucessful
*/
GstPadLinkReturn
gst_pad_proxy_pad_link (GstPad *pad, const GstCaps *caps)
{
GstElement *element;
const GList *pads;
GstPadLinkReturn ret;
GST_DEBUG ("proxying pad link for %s:%s\n", GST_DEBUG_PAD_NAME (pad));
element = gst_pad_get_parent (pad);
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *otherpad = GST_PAD (pads->data);
if (otherpad != pad) {
ret = gst_pad_try_set_caps (otherpad, caps);
if (GST_PAD_LINK_FAILED (ret)) {
return ret;
}
}
pads = g_list_next (pads);
}
return GST_PAD_LINK_OK;
}
/**
* gst_pad_proxy_fixate:
* @pad: a #GstPad to proxy.
*
* Implements a default fixate function based on the caps set on the other
* pads in the element. This function should only be used if every pad
* has the same pad template caps.
*
* Returns: a fixated caps, or NULL if caps cannot be fixed
*/
GstCaps *
gst_pad_proxy_fixate (GstPad *pad, const GstCaps *caps, gpointer unused)
{
GstElement *element;
const GList *pads;
const GstCaps *othercaps;
GST_DEBUG ("proxying fixate for %s:%s\n", GST_DEBUG_PAD_NAME (pad));
element = gst_pad_get_parent (pad);
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *otherpad = GST_PAD (pads->data);
/* FIXME check that each pad has the same pad template caps */
if (otherpad != pad) {
othercaps = gst_pad_get_negotiated_caps (otherpad);
if (othercaps) {
GstCaps *icaps;
icaps = gst_caps_intersect (othercaps, caps);
if (!gst_caps_is_empty (icaps)) {
return icaps;
} else {
gst_caps_free (icaps);
}
}
}
pads = g_list_next (pads);
}
return NULL;
}
/**
* gst_pad_proxy_link:
* @pad: a #GstPad to proxy to.

4
gst/gstpad.h
View file

@ -411,7 +411,11 @@ gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
void gst_pad_set_fixate_function (GstPad *pad, GstPadFixateFunction fixate);
GstCaps * gst_pad_proxy_getcaps (GstPad *pad);
GstPadLinkReturn gst_pad_proxy_pad_link (GstPad *pad, const GstCaps *caps);
GstCaps * gst_pad_proxy_fixate (GstPad *pad, const GstCaps *caps, gpointer unused);
#ifndef GST_DISABLE_DEPRECATED
GstPadLinkReturn gst_pad_proxy_link (GstPad *pad, const GstCaps *caps);
#endif
gboolean gst_pad_relink_filtered (GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps);
#ifndef GST_DISABLE_DEPRECATED
gboolean gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad);