Home grown elements can't auto plug

[Matt_iotapi322]

I’m having some problems with autoplugging and matching capabilities with two
home grown element plugins and would like to have some input from the mail
list if possible.

Short story:
I have an HLS demux plugin that is outputting encrypted HLS streams.  I have
set the caps of the GST_Buffer to be:
"data/x-drm, "
         "type = 1" 

I have created a software decrypter filter that has static caps of :
GST_STATIC_CAPS ("data/x-drm, " "type = (int) [0, 5]")

I am attempting to use playbin to auto plug the whole pipeline together. 
However it doesn’t seem like decodebin2 “sees “ my decrypter filter.  

If I use gst-inspect  I see the decrypter filter, and when I run gst-inspect
decryptor_filter_name it shows correctly the dump of information.  

I have also set the rank of the element to primary.  What leads me to
believe that decodebin doesn’t see my element is with debug turned on the
list of gst_element_factory_list_filter does not show my “filter”

Other information, the platform I’m working on is required to be gstreamer
0.10.36 


0:00:09.499083619 12293 0x7f861c08fe90 LOG               decodebin2
gstdecodebin2.c:2512:are_final_caps:<decodebin20> Checking with caps
data/x-drm, type=(int)1
0:00:09.499096853 12293 0x7f861c08fe90 LOG               decodebin2
gstdecodebin2.c:2519:are_final_caps:<decodebin20> Caps are not final caps
0:00:09.499111669 12293 0x7f861c08fe90 DEBUG               playbin2
gstplaybin2.c:3049:autoplug_factories_cb:<playbin20> factories group
0x196d790 for '':decodepad1, data/x-drm, type=(int)1
0:00:09.499124597 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:893:gst_element_factory_list_filter: finding factories
0:00:09.499135707 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying pulsesink
0:00:09.499157221 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying
mpegaudioparse
0:00:09.499167797 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying
mpegvideoparse
0:00:09.499178131 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying
mpeg4videoparse
0:00:09.499188502 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying mp3parse
0:00:09.499198975 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying h264parse
0:00:09.499208950 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying h263parse
0:00:09.499219119 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying flacparse
0:00:09.499229129 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying dcaparse
0:00:09.499239158 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying amrparse
0:00:09.499249295 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying ac3parse
0:00:09.499259403 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying aacparse
0:00:09.503452700 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying xvimagesink
0:00:09.503477417 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying wavparse
0:00:09.503488651 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying vp8dec
0:00:09.503499012 12293 0x7f861c08fe90 DEBUG    GST_ELEMENT_FACTORY
gstelementfactory.c:904:gst_element_factory_list_filter: Trying vorbisdec


…etc
..etc

finally:

0:00:09.661571552 12293 0x7f861c08fe90 DEBUG                GST_BUS
gstbus.c:308:gst_bus_post:<bus3> [msg 0x7f8614004c90] posting on bus, type
element, missing-plugin, type=(string)decoder, detail=(GstCaps)data/x-drm,
type=(int)1, name=(string)"data/x-drm\ decoder"; from source <decodebin20>

Does my element have to inherit from another  class to be able to auto plug?



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