Good afternoon,
I'm trying to implement functions for capture and playout of PCM audio
samples with the libasound API (version 1.0.16-2, under Debian 5.0) and need
to limit capture/playback to a single channel - in short, it should be
possible to playout/capture PCM samples only through the right or left
channel (which can be choosen) of a given audio device, completely ignoring
the other channel. Although it would be possible to simply playback/record
from both channels and masking the unneeded one by setting the corresponding
sample values to a null value, this approach seems rather clumsy to me. It
would be preferable to simply configure an audio device with
capture/playback limited to either the right or the left channel, returning
samples from this channel only (i. e. without interleaved samples from the
other channel).
Although I've searched through the ALSA doc, I couldn't find a suitable
configuration option for channel choice - maybe I just oversaw it, because I
would be rather surprised, if there would be no option to simply turn off an
entire channel (or maybe there IS a good reason for this functionality not
to exist?).Note that the channel-parameter in the
snd_pcm_hw_params_set_channels()-function does not help me because it
doesn't allow setting the explicit channel (left or right) from where to
capture or playout.
Thanks in advance for all answers,
pk
------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
_______________________________________________
Alsa-user mailing list
Alsa-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/alsa-user
