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basetransform: Allow going passthrough inside decide_allocation

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Sub-class may want to decide to go passthrough/in-place by inspecting
the support meta APIs. This patch duplicates the check for this mode,
so we still don't do uneeded allocation query while we allow sub-classes
to switch the behaviour during it's own decide_allocation call.

Notice that such sub-class need to reset the class to non-passthrough in
set_caps() in order for decide_allocation to be called again. This is
needed otherwise we'd be doing an allocation query in element in which
it make no sense (notably capsfilter).

https://bugzilla.gnome.org/show_bug.cgi?id=791453
This commit is contained in:
Nicolas Dufresne 2017-12-11 20:58:16 -05:00
parent f85e93d004
commit 443221c661
1 changed files with 9 additions and 0 deletions
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9
libs/gst/base/gstbasetransform.c
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@ -949,6 +949,15 @@ gst_base_transform_do_bufferpool (GstBaseTransform * trans, GstCaps * outcaps)
if (!result)
goto no_decide_allocation;
/* check again in case the sub-class have switch to passthrough/in-place
* after looking at the meta APIs */
if (priv->passthrough || priv->always_in_place) {
GST_DEBUG_OBJECT (trans, "no doing passthrough, delay bufferpool");
gst_base_transform_set_allocation (trans, NULL, NULL, NULL, NULL);
gst_query_unref (query);
return TRUE;
}
/* we got configuration from our peer or the decide_allocation method,
* parse them */
if (gst_query_get_n_allocation_params (query) > 0) {