At Thu, 29 Jan 2009 18:27:09 -0500,
James wrote:
>
> Clemens Ladisch wrote:
> > James wrote:
> >
> >> $ speaker-test -D iec958 -c 6
> >> ...
> >> Channels count (6) not available for playbacks: Invalid argument
> >>
> >
> > S/PDIF does not support uncompressed surround sound; you have to play
> > stereo data (use "-c 2") or AC-3/DTS-compressed data.
> >
> >
> > Best regards,
> > Clemens
> >
> Speaker-test used to output to all my speakers.
> -c 2 DOES output to my left and right front speakers but I can't get
> anything out of the others in my 5.1
SPDIF supports basically only 2-channel PCM. 5.1 is implemented in a
compress format such as AC3 or DTS, which is transmitted as if a
two-channel PCM stream, and the receiver expands the compressed stream
again to 5.1.
> $ aplay -D iec958 -c 2 /storage/music/goodbye3.wav
> Playing WAVE '/storage/music/goodbye3.wav' : Signed 16 bit Little
> Endian, Rate 22050 Hz, Mono
> aplay: set_params:966: Channels count non available
It's because you're trying to play a mono sample on a 2-ch stereo
device without the conversion plugin. Wrap with "plug:", e.g.
aplay -D plug:iec958 -c 2 /storage/music/goodbye3.wav
(But, this doesn't mean that it'll be converted to 5.1 compressed
format, though.)
Takashi
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