Subject: Re: [ecasound] problems with the loop device and changing formats
From: Kai Vehmanen (k_AT_eca.cx)
Date: Wed Oct 31 2001 - 04:23:09 EET
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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