Subject: Re: [ecasound] problems with the loop device and changing formats
From: Jeremy Hall (jhall_AT_uu.net)
Date: Wed Oct 31 2001 - 13:11:38 EET
Hi,
ok not sure about my ghosting--am still investigating that--but with the
wav stuff:
outputting to wav at a rate other than 44100 produces incorrect noises, as
if ecasound is doing some crude rate calculation to 44100 then back to
48000. I had to use sox to give me a valid wav and do the rate
calculation because ecasound just doesn't do it right. Does ecasound use
libsndfile for any of this rate calculation stuff?
_J
In the new year, Kai Vehmanen wrote:
> On Tue, 30 Oct 2001, Jeremy Hall wrote:
>
> > then I tried outputing to a wav, this caused the wierd noises I was
> > hearing before, so I checked and all the rates and formatting were
> > correct. Next, I tried output to a raw file and that sounded correct.
>
> Hmm, I found at least one place in the loop-device code which might cause
> trouble when -sr is not 44100... I'll put the change to CVS.
>
> > I noticed I was hearing a ghost image in the right channel for something
> > based on frames_per_cycle, so I decided to use a larger
> > frames_per_cycle. I used 1024 and thought I noticed it more, so decided
> > to use 4096. well that was fun, except the process hung and given that it
> > was RT priority, it has happily consumed the resources of the computer,
> > somehow both cpu's, I guess some of its multithreaded process got onto
> > both of them
> [...]
> > and yes I think double buffering was enabled
>
> This isn't non-realtime operation anymore, right (-> both rt-priority and
> double-buffering are disabled if there are no rt-devices)?
>
> Were you possibly outputting to an ALSA-device, and if yes, alsa,hw:0 or a
> plugin device? I've noticed weird behaviour with big buffersizes with
> older ALSA 0.9.x/0.6.x versions... Does the same problem occur with
> /dev/dsp emulation?
>
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