[Gstreamer-bugs] [Bug 113258] Changed - gst_caps_intersect() returns NULL for empty intersection

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http://bugzilla.gnome.org/show_bug.cgi?id=113258

Changed by ds at schleef.org.

--- shadow/113258	Tue Jul 29 14:07:47 2003
+++ shadow/113258.tmp.19375	Tue Aug 19 00:34:57 2003
@@ -80,6 +80,26 @@
 chain indicator as well.
 
 I like the idea of making GST_CAPS_ANY a fixed number, since that
 makes it easy to test, instead of needing a GST_CAPS_IS_ANY(). 
 Alternatively, we could special-case gst_caps_copy() so that it won't
 actually copy the ANY caps.
+
+------- Additional Comments From ds at schleef.org  2003-08-19 00:34 -------
+I'm starting with the migration.  The first step is to define
+GST_CAPS_ANY and GST_CAPS_NONE (done) and identify as many places in
+gstreamer and gst-plugins where NULL needs to be converted to
+GST_CAPS_ANY.  (working on it)  (GST_CAPS_ANY is still defined as
+NULL.)
+
+After that is done, I'll add code to properly intersect caps with
+GST_CAPS_ANY, and add an assertion to make sure that pad caps are not
+set to GST_CAPS_NONE.
+
+I *think* that this can all be done so that one can flip a #define and
+get either the old behavior or new behavior.  At least, I'm going to
+attempt to do it that way, to make debugging easier.
+
+One thing that hasn't been discussed: props may need similar
+treatment.  However, it should only need to be internal.  A caps
+with GST_PROPS_NONE would imply GST_CAPS_NONE, so it would only need
+to be used internally in the props intersection code.