>I, however did find something regarding AC-3 stuff in the Multiface >manual, but am not sure as to what does it exactly refer to. The whole >pdf file can be found here:
[ ... ] >This 'SPDIF' signal sounds like chopped noise at highest level. >Therefore check 'Non-audio' in >the card's Settings dialog, to prevent most SPDIF receivers from >accepting the signal, and to >prevent any attached equipment from being damaged. You can do this easily with ALSA. Its just one of the standard IEC958 bits that can be set with alsactl, amixer or set. You'll have to ask on alsa-devel what to set, since the Hammerfall driver shares generic ALSA code to set these bits, and I don't know how this is designed. There are several IEC958-related switches, and one of them contains the relevant bits for this task. However, I have no idea how you would deliver AC-3 to the S/PDIF channels. Presumably, AC-3 is a stereo (or more precisely, 2 channel) encoding of a multichannel signal, and thus its first packaged into a 2 channel form and just written to the channels. Right? --p
