>I am working on a problem where I want to extract the left and right
>channels from a sound file.
sox can do this from the command line.
I am running into a problem where I can not
>tell if the samples are from the left only, or the right only channels.
>I have a sound file that is mono, when I play this file through ALSA, the
>samples come out on both left and right speakers. It seems either ALSA is
>sending the mono samples to both channels, or my soundcard is doing it.
>I am wondering if there is a way to control whether a mono sound file can
>be played to only one speaker using ALSA.
alsa-lib does this when you use a "plug" PCM device (which is the
default when you install ALSA). if you open a N channel device as an
(N-M) channel device, it duplicates the signal across the the missing
channels. this can be controlled from your ~/.asoundrc but nobody has
written a decent document to explain how to change this. a search of
the archives for "ttable" may reveal some ideas, but ...
--p
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