GDCL was founded by Geraint Davies in 1996 to provide system software design and development. Between 1996 and 2015 he concentrated on multimedia software, particularly DirectShow, and on Windows device drivers.

GDCL was closed when Geraint joined Periscope & Twitter in 2015, but is re-opening for business in June 2022.

Our clients include Microsoft, VBrick, Philips Semiconductors, Mediamatics, Broadcom, Intel and the BBC. Our projects have covered the following technologies:

  • MPEG-1, MPEG-2 and MPEG-4 demultiplexing and playback, analysis and content management, multiplexing and authoring
  • Support for H.264 encoding and decoding
  • DXVA acceleration
  • HD-DVD and Blu-ray navigation and playback
  • DVD authoring, navigation and playback
  • Video mixing and graphics overlay
  • Network delivery of video and data, and live playback using ATM, UDP Multicast and RTSP.
  • All aspects of DirectShow, including DirectX Audio Plug-in support
  • Microsoft's WDM Audio and WDM Video Capture
  • Device driver development including AVStream and WDM
  • Design and implementation of embedded systems
  • Microsoft's COM and ActiveX technologies
  • C, C++, C#, Objective-C, Java and Ruby
  • Quicktime and AV Foundation
  • Stagefright for Android

Geraint Davies Consulting (2022) Ltd is registered in England and Wales, No 14124431.

Registered Office: 13 Trinity Square, Llandudno, Conwy LL30 2RB.


GDCL is based in a rural area of Anglesey, in North Wales. Background information about Anglesey can be found below