You were right of course. It works beautifully. Thank you very much!
So, just for the record, so that anyone else out there trying to get this device to work in the future will be able to find it:
The Creative Mp3+ USB device output works completely under Alsa (I've not tried input).
To get ac3 passthrough you need to get an ac3 file and use
ac3dec -Dhw:0,0 -C <your_ac3_file>
You can play media with ac3 in mplayer with the oss compatibility layer (mplayers alsa driver does not seem to be able to passthrough) using:
mplayer -ao oss:/dev/dsp -ac hwac3 <your file>
Lars
You have wrong tests. Get alsa-tools, compile ac3dec and try this command:
ac3dec -Dhw:0,0 -C <your_ac3_file>
The volumes (probably PCM and Master) should be set to 0dB (you need probably trial and error path to determine the good values), otherwise the stream will be modified and the receiver will not understand. Simply, you need bit-to-bit copy without any modification of outgoing samples.
Anyway, it might be possible, that your receiver does rely on the non-audio bit set in the s/pdif protocol. In this case, we cannot help you until someone discover, how this settings can be applied to your hardware.
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