[linux-audio-user] Re: [Alsa-devel] dmix vs alsaplayer [was jackd, zynaddsubfx and iiwusynth]

New Message Reply About this list Date view Thread view Subject view Author view Other groups

Subject: [linux-audio-user] Re: [Alsa-devel] dmix vs alsaplayer [was jackd, zynaddsubfx and iiwusynth]
From: Kai Vehmanen (kai.vehmanen_AT_wakkanet.fi)
Date: Mon Mar 03 2003 - 20:59:54 EET


On Tue, 4 Mar 2003, Patrick Shirkey wrote:

>> Has anyone tried the dmix plugin thats part of alsa rc8? This looks
> I was fscking around with it on Saturday. So far I have managed to use
> multiple instances of aplay but other apps like alsaplayer bork at it. I
> have yet to figure out why but I think I should probably submit a bug
> report somewhere.

I've tried it with ecasound and seems to work just fine. One catch is that
dmix only supports a certain set of audio format parameters at a time. You
can change these via asoundrc (or dmix:x,y), but not at run time. Anyway,
with default dmix installation (on top of snd-intel8x0 hw):

ecasound -i foo.wav -o alsa,dmix -b:4096 &
ecasound -i bar.wav -o alsa,dmix -b:4096

... plays the two files at the same time. -b:4096 is needed because of the
abovementioned reasons.

> $ alsaplayer -o alsa -d plug:\'dmix:SLAVE=\"hw:2,1\",RATE=44100\'
> track_8.wav
[...]
> PERIOD_SIZE: 5513
> PERIOD_BYTES: 22052
[...]
> error on set_period_size (1024)
> Unavailable hw params:

Try matching the alsaplayer period_size to the one used by dmix with
the "-f 22052" alsaplayer option.

PS Opening dmix in non-interleaved mode produces totally garbled output:
   "ecasound -i foo.wav -f:16,2,44100,n -o alsa,dmix -b:4096"

--
 http://www.eca.cx
 Audio software for Linux!


New Message Reply About this list Date view Thread view Subject view Author view Other groups

This archive was generated by hypermail 2b28 : Mon Mar 03 2003 - 21:23:35 EET