[LAD] Trying to understand mixer in ALSA API

Zixns alexduthil at gmail.com
Fri Aug 31 13:19:20 UTC 2012

so if understand, a single audio stream is coming from the software mixer,
which mixes multiple stream from different sources, and transfered using the
PCM interface to th kernel and then to the hardware ? the software mixing in
alsa is done by dmix i guess ?

Paul Davis wrote:
> On Fri, Aug 31, 2012 at 8:39 AM, Alexandre <alexduthil at gmail.com> wrote:
>> Hi
>> Kinda new to linux audio and still a bit new to dev generally and I'm
>> trying to understand the basis of linux audio.
>> By that, I mean the ALSA API :
>> I would like to use the PCM interface and the mixer interface to mix 2
>> sounds
> the mixer interface does not do that. its an API to control the hardware
> mixer (if any) present in the audio interface hardware. a lot of current
> audio interface hardware is incapable of mixing sound from multiple
> sources, so this is generally done in software.
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