[PD] Linux, Hammerfall, ALSA

[Miller Puckette]

Hmm, and here I am trying to migrate Pd to use portaudio... I wonder
if they've already "fixed" this???

cheers
Miller

On Fri, Feb 21, 2003 at 12:03:49PM +0100, guenter geiger wrote:
> 
> 
> Johannes,
> 
> thanks for the feedback. this is very important for me, because I do
> not have a HDSP card.
> I will address the 512 blicksize issue soon, this will improve latency
> figures (Should improve the behaviour of pd/ALSA in general, at least that
> is what I hope for).
> 
> Will post updates to the list.
> 
> Guenter
> 
> On Thu, 20 Feb 2003, Johannes Taelman wrote:
> > Hi all,
> >
> > I'm testing it here with my HDSP Multiface, and it seems to work fine as
> > long as I use -blocksize 512 or bigger. Smaller buffers always sound
> > broken. I'm using a 2.4.20 kernel with the low-latency patches and ext3
> > patches. The latency via analog loopback as reported by
> > pd/doc/7.stuff/tools/latency.pd is 25ms.
> >
> > It's better than going via jack, because a couple of underruns (caused by
> > eg. dragging 100 objects in a patch) give a 'audio IO stuck' and I have to
> > restart PD to get audio up again.
> >
> > Dragging lots of objects gives crackles, but operation is stable if I
> > don't mess with the gui, even at very high CPU loads.
> >
> > 96kHz does not work. I guess PD is confused by the different number of
> > channels @ 96kHz. Here the transcript:
> >
> > : # pd -alsa -verbose -blocksize 1024 -r 96000 -rt
> > :       pd/doc/7.stuff/tools/latency.pd
> > : reading startup file: /root/.pdrc
> > : Pd version 0.36-0
> > : compiled 21:02:57 Feb 19 2003
> > : device 1: tried /dev/midi READ/WRITE; returned 3
> > : opened 1 MIDI input device(s) and 1 MIDI output device(s).
> > : audio buffer set to 40 ms
> > : opening sound input...
> > : Using noninterleaved mode
> > : snd_pcm_hw_params_set_channels (input): Invalid argument
> > : ALSA lib pcm_hw.c:297:(snd_pcm_hw_hw_params) SNDRV_PCM_IOCTL_HW_PARAMS
> > : failed: Device or resource busy
> > : snd_pcm_hw_params (input): Device or resource busy
> > : pd: pcm.c:4907: snd_pcm_sw_params_current: Assertion `pcm->setup'
> > : failed.
> > : Aborted
> >
> > Remember to do a warm-boot if you don't get any output from the
> > multiface...
> >
> >  j#|@
> >
> > On Fri, 14 Feb 2003, guenter geiger wrote:
> >
> > >
> > > Hi,
> > >
> > > Finally I have been able to get pd running with the Hammerfall and
> > > the ALSA drivers.
> > > It did cost me more time than I thought, at the end I was randomly
> > > trying different combinations of hundreds of calls for setting
> > > fragmentsizes, fragment numbers, samplerate and channels, ...
> > > and ... one combination worked !
> > >
> > > Latency is not too good, I think this is because the driver currently
> > > works in non-blocking mode. So be sure to set "-bufsize 256" or bigger.
> > > (e.g.512,1024,2048,4096).
> > >
> > > The code is in CVS, checkout with
> > >
> > > #> cvs -d:pserver:anonymous at cvs.sourceforge.net:/cvsroot/pure-data login
> > >
> > > #> cvs -z3 -d:pserver:anonymous at cvs.sourceforge.net:/cvsroot/pure-data co
> > > -r devel_0_36
> > >
> > > For those who work with the non CVS version, download s_linux.c from
> > > http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/pure-data/pd/src/?only_with_tag=devel_0_36
> > >
> > > put it into your pd/src directory and recompile.
> > >
> > > I do not know how well it runs on an HDSP (please report).
> > >
> > > Guenter
> >
> 
> 
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