<note>
<para>
When checking if upstream supports pull mode, it is usually not
enough to just check for GST_PAD_MODE_PULL with this function, you
also want to check whether the scheduling flags returned by
gst_query_parse_scheduling() have the seeking flag set (meaning
random access is supported, not only sequential pulls).
</para>
</note>
Check if @query has scheduling mode set.
<note> <para> When checking if upstream supports pull mode, it is usually not enough to just check for GST_PAD_MODE_PULL with this function, you also want to check whether the scheduling flags returned by gst_query_parse_scheduling() have the seeking flag set (meaning random access is supported, not only sequential pulls). </para> </note>