Subject: Re: [ecasound] problems with the loop device and changing formats
From: Jeremy Hall (jhall_AT_uu.net)
Date: Wed Oct 31 2001 - 02:56:49 EET
WOOOOOOOOOOOOOO RIGHT ON!
so I tried the new ecachanges and SHAZAM! alsa support works again. YAY!
then I tried the command line version of this setup and it worked WITH the
freeverb, so fixing the init problem solved it.
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.
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
anyway it is now quite happily spewing
pure virtual method called
all over the screen. I guess I'll have to reboot?
_J
and yes I think double buffering was enabled
In the new year, Kai Vehmanen wrote:
> On Tue, 30 Oct 2001, Jeremy Hall wrote:
>
> > I tried the following chain setup file
> [...]
> > # chain operators and controllers
> > -a:1 -^erc$:1.00,2.00
> > -a:2 -^epp$:0.00
> > -a:3 -^erc$:1.00,2.00 -^epp$:100.00
> > -a:4 -el:freeverb3,0.00,0.90,0.80,0.08,0.50,1.00 -^ea$:55.00
> > -a:5 -el:freeverb3,0.00,0.80,0.25,0.17,1.00,1.00
>
> Btw; this bug (regexp-strings were saved to chainsetup files) is now fixed
> in CVS.
>
> > now when I start this, it produces noise! I have determined it is the
> > freeverb's that is doing the noise. I first have to start ecasound
> > rolling, THEN add them. When I start ecasound rolling, I get a burst of
> > noise, probably because the loop devices aren't initialized properly, then
> > I get recognizable sound...but only out of the left channel.
>
> There's so many things happening here that it's difficult to say what is
> causing trouble. I managed to get the above chainsetup working on my
> machine. I did get the additional noise you mention. This is now fixed in
> CVS. Freeverb didn't make the problems worse for me.
>
> Can you possibly trigger these problems with smaller setups. At least
> the following params make debugging difficult:
> - with / without effects
> - non-standard / standard srate
> - loop-devices in setup
> - only mono / only n-channels / mixed setup
> - ... and so on
>
> If you can isolate the problem with the above criteria (ie. enabling
> effect x triggers the problem), finding the cause gets much, much easier.
>
> > if I put all that crap on the command line and output to alsa,dsp1, all is
> > lovely (minus the freeverb of course) and then if I try to write to a wav
> > file, not only does the wav file run off the end of the session, but it
> > sounds quite dithered or processed, as if the wrong sample rate was used
> > internally somewhere.
>
> The first problem - setups with loop-devices never end - is a known
> one. I'll try to take a look at it later today. As for the dithering,
> after the chainsetup is loaded, check 'aio-status' and verify that all
> files and devices have the correct sample-rate (48000 in this case).
>
> --
> http://www.eca.cx
> Audio software for Linux!
>
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