[alsa-devel] Audio quality issues with dmix plugin

Rene Herman rene.herman at keyaccess.nl
Wed Nov 7 01:29:27 CET 2007

On 06-11-07 09:16, Pharaoh . wrote:

> When I play a 44Khz file without using any ALSA plugin like
> #aplay -Dhw:0,0 44k.wav
> the sound quality is awesome but when I play the same file using dmix,
> clicks are introduced.
> #aplay -Dplug:dmix 44k.wav
> changing period size and buffer size doesn't help. I am testing my ALSA
> driver on an OMAP850
> based board.

dmix does 48 kHz by default. Does it sound "awesome" when you play a 48 kHz 
file directly to hw:0,0? If that also clicks, the problem will be your 
driver's handling of the 48 kHz rate -- if not, it'll be the resampling, and 
I'll probably need to bow out...


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