On 28-Mar-2003 Paul Davis wrote:
>>>one channel only.
>>>[...]
>>
>>...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.
>
> that's a driver author's design decision. if the "hw" PCM device is
> opened with a single channel, it would be equally valid to play on one
> channel only. if the h/w can't handle that, it should not
> advertise itself to be capable of mono operation. IMHO.

I choosed to send the sound to one channel only, so the apps can
use all 8 mono channels.
Since most cards can do mono to stereo in hardware, I would be nice to
add a capability flag for that. Using that features you halve memory
usage for buffers and irq frequency.


Bye.



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