From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Hofman <pavel.hofman@ivitera.com>
Subject: Re: SPDIF: How to play mono sound
Date: Tue, 08 Nov 2011 11:18:58 +0100
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To: ajay khandelwal <ajay.lforum@gmail.com>
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Dne 8.11.2011 11:04, ajay khandelwal napsal(a):
> Hi all,
>  I have a pc with SPDIF out. I want to play audio file with single
> channel(mono) using aplay.
> 
> How to do that, when I try to play with following command, it gives error
> 
> aplay -Diec958:CARDICH6,DEV=0 mono_music.wav
> 
> it gives following error
> aplay: set_param:1065: Channels count not available.
> 

How about

aplay -Dplug:iec958:CARDICH6,DEV=0 mono_music.wav

Spdif is a stereo device and does not accept a single channel stream.
The plug plugin will do the conversion:

Plug PCM: Route conversion PCM (sformat=S16_LE)
  Transformation table:
    0 <- 0
    1 <- 0


Pavel.