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basetransform: If there's no peer we still have to transform ANY caps in getcaps()

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Otherwise elements like capsfilter will return ANY caps if no
peer is present instead of the filter caps. The transform_caps()
vfunc could do transformations to the template caps that do not
result in the unmodified template caps.
This commit is contained in:
Sebastian Dröge 2011-09-07 16:02:31 +02:00
parent dbfc0d9b35
commit a121713f0c
1 changed files with 23 additions and 22 deletions
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45
libs/gst/base/gstbasetransform.c
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@ -657,7 +657,8 @@ gst_base_transform_getcaps (GstPad * pad)
{
GstBaseTransform *trans;
GstPad *otherpad;
GstCaps *peercaps, *caps;
const GstCaps *templ;
GstCaps *peercaps, *caps, *temp;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
@ -666,9 +667,6 @@ gst_base_transform_getcaps (GstPad * pad)
/* we can do what the peer can */
peercaps = gst_pad_peer_get_caps_reffed (otherpad);
if (peercaps) {
GstCaps *temp;
const GstCaps *templ;
GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peercaps);
/* filtered against our padtemplate on the other side */
@ -676,24 +674,30 @@ gst_base_transform_getcaps (GstPad * pad)
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
temp = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
} else {
temp = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad));
GST_DEBUG_OBJECT (pad, "no peer, using our template caps %" GST_PTR_FORMAT,
temp);
}
/* then see what we can transform this to */
caps = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (otherpad), temp);
GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
gst_caps_unref (temp);
if (caps == NULL)
goto done;
/* then see what we can transform this to */
caps = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (otherpad), temp);
GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
gst_caps_unref (temp);
if (caps == NULL)
goto done;
/* and filter against the template of this pad */
templ = gst_pad_get_pad_template_caps (pad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
/* We keep the caps sorted like the returned caps */
temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (caps);
caps = temp;
/* and filter against the template of this pad */
templ = gst_pad_get_pad_template_caps (pad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
/* We keep the caps sorted like the returned caps */
temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (caps);
caps = temp;
if (peercaps) {
/* Now try if we can put the untransformed downstream caps first */
temp = gst_caps_intersect_full (peercaps, caps, GST_CAPS_INTERSECT_FIRST);
if (!gst_caps_is_empty (temp)) {
@ -702,9 +706,6 @@ gst_base_transform_getcaps (GstPad * pad)
} else {
gst_caps_unref (temp);
}
} else {
/* no peer or the peer can do anything, our padtemplate is enough then */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
done: