iec958 and 24-bit audio

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When I try playing 24-bit audio files on my SPDIF output, I get this

[alsa-lib]$ aplay -Diec958 file24bits.wav
aplay: set_params:1059: Sample format non available
Available formats:
- S16_LE
- S32_LE

Is there an built-in assumption that the iec958 device can only take
as input what the slave hardware device supports? The IEC subframes
can convey 24 bit audio, and it's possible to insert the 24 bits
starting from bit 4 when adding the preambles and status bits. What am
I missing?
Thanks,
-Poerre
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