hdmi_vendor_infoframe_pack — write a HDMI vendor infoframe to binary buffer
| ssize_t hdmi_vendor_infoframe_pack ( | struct hdmi_vendor_infoframe * frame, | 
| void * buffer, | |
| size_t size ); | 
   Packs the information contained in the frame structure into a binary
   representation that can be written into the corresponding controller
   registers. Also computes the checksum as required by section 5.3.5 of
   the HDMI 1.4 specification.
   
Returns the number of bytes packed into the binary buffer or a negative error code on failure.