[alsa-devel] Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII

Raymond Yau superquad.vortex2 at gmail.com
Wed Feb 24 04:49:47 CET 2010

2010/2/23 Clemens Ladisch <clemens at ladisch.de>

> Lennart Poettering wrote:
>  Only mixer controls with interface PCM (not MIXER) have (sub-)
> device numbers, and at the moment this is used only for controls that
> are associated with the streams of hardware-mixing-capable cards.
> Regards,
> Clemens

Just implementing those IFACE_PCM control for the driver is not enough for
any practical use

Will need an API which allow the application to change the hardware per
stream volume in optimized way by calling one api ? ( e.g. those API is need
for if wine want to implement the real hardware acclerated dsound for those
hardware mixing sound cards which support at least 16 voices )

More information about the Alsa-devel mailing list