Xperia Tablet S - Native media app play-back

My Xperia Tablet S works fine with Skifta and MX Player, but this is a little 'clunky' and I'd love to be able to play everything in the native Sony media player.
The device name is SGPT121 and the DLNA certification can be found here: http://certification.dlna.org/certs/REG23138846.pdf
According to the certification, the formats supported are:
I'd really like to try and develop a profile for the Tablet S but I'm completely new to this and it's years since I've done any kind of coding. I couldn't find "AVC_MP4_BL_CIF15_AAC_520" defined in the MediaFormatProfiles at the top of the profiles.xml - does it need to be defined? Where should I start?
Any help or pointers would be very much appreciated.
The device name is SGPT121 and the DLNA certification can be found here: http://certification.dlna.org/certs/REG23138846.pdf
According to the certification, the formats supported are:
Image: JPEG_LRG / JPEG_MED / JPEG_SM / PNG_LRG
Audio: AAC_ADTS_320 / AAC_ISO_320 / MP3
Video: AVC_MP4_BL_CIF15_AAC_520
I'd really like to try and develop a profile for the Tablet S but I'm completely new to this and it's years since I've done any kind of coding. I couldn't find "AVC_MP4_BL_CIF15_AAC_520" defined in the MediaFormatProfiles at the top of the profiles.xml - does it need to be defined? Where should I start?
Any help or pointers would be very much appreciated.