[alsa-devel] [PATCH] Add support for gain in softvol plugin

Steve Longerbeam stevel at embeddedalley.com
Thu May 3 21:11:20 CEST 2007

Hi all,

What do you think of this patch? I tested this using a stac9205 HDA 
codec with all sample formats supported by softvol (s32, s16, s24, big 
and little endian).

The potential drawback I see is that softvol now has to use a 
intermediate long long multiply and add when computing amplified 32-bit 
samples. This wasn't an issue with the system I tested on, but possibly 
could be on slower machines. Also, are their any portability issues with 
using a long long datatype in alsa-lib? What is the list of embedded 
architectures that alsa-lib is targeted to build on? I see long long 
used in many other places in alsa-lib, so I'm hoping this isn't an issue.


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