Patent ID: 8676362

Claim:
An apparatus comprising: a high-definition (HD) audio controller to obtain digital audio data from main system memory; and tunneling logic coupled with the HD audio controller, the tunneling logic to receive the digital audio data from the HD audio controller via an isochronous media link, to encapsulate the digital audio data in a message suitable for an in-band input/output (IO) interconnect, and to send the message to an add-in graphics card via the in-band IO interconnect to adjust a clock signal of the main system memory to accommodate a clock signal of the HD audio controller through a PCI Express (PCIe) vendor defined message (VDM) transmitted as needed to the HD audio controller, wherein the message includes at least a message length, an indicator that the message includes media data, a target identifier, a timestamp to enable the audio stream to be synchronized with a video stream and an indication of a media format corresponding to media data in the message.