[alsa-devel] How to test new SDPIF implementation?

I would like to test my SPDIF driver implementation. How can I used command line tools to play sample 5.1 music over SPDIF?

I have a file 5.1 AC3 encoded file -- w.ac3

This doesn't work:

iecset -D hw:0 audio off aplay -c 2 -r 48000 -f S16_BE -D hw:0,1 w.ac3

I can play uncompressed music on SDPIF without problem. I know my audio system will play the compressed music, I can use A52 from my desktop.