Re: [Alsa-user] Noisy dmix+dsnoop+asym recording

[Carlos P. <car...@gm...>]

I forgot to say that all other things being equal the output is clean too
for oss emulation without aoss, that is, without dsnoop, dmix and asyn.

Cheers,
Carlos

On 6/18/07, Carlos Pita <car...@gm...> wrote:
>
> Hi folks,
>
> I'm capturing my guitar through dsnoop with the configuration listed
> below. This input is just forwarded to the dmix output by a trivial puredata
> patch. Disregarding the buffer sizes, the output is a bit noisy, it makes a
> frying noise. The same pd patch on top of jack with equivalent period and
> buffer sizes (or even smaller) and the same sample rate gives a clean
> output. Do you have any idea about what can be causing the noises? My card
> is HDA-Intel - HDA VIA VT82xx, which I think has native 48000 sr, so there
> should be no resampling involved. Buffers seem big enough (with jack I
> usually find that quality is acceptable for much smaller buffers, for
> example 4 periods with 64 frames per period).
>
> Thank you in advance
> Cheers,
> Carlos
>
>   type dmix
>   slave {
>     pcm "hw:0,0"
>     channels 2
>     period_size 1024
>     buffer_size 4096
>     rate 48000
>   }
> }
>
> pcm.dsnooped {
>   ipc_key 1027
>   type dsnoop
>   slave {
>     pcm "hw:0,0"
>     channels 2
>     period_size 1024
>     buffer_size 4096
>     rate 48000
>   }
> }
>
> pcm.asymed {
>   type asym
>   playback.pcm "dmixed"
>   capture.pcm "dsnooped"
> }
>
>