Paul Davis wrote:
When an application opens a mono substream, the sound has to
be sent to one channel only or must the low level driver
transparently convert it to stereo ?
one channel only.
in ALSA, low level drivers do not do any kind of format
conversion. that is accomplished (if necessary) by code running in
user-space, typically part of alsa-lib. the low level driver simply
advertises the capabilities of the hardware, provides ways to use
those capabilities, and lets the midlevel code and alsa-lib do the rest.
...but, if you are doing mono playback, your sound driver has to setup
your soundcard to playback on both channels the same mono channel. The Vortex
driver (still not in the main branch) for example splits the mono signal on its internal
mixer into 2 identical signals which are feed one into each CODEC channels.
Best Regards
Manuel Jander
--p
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