alsa flag (was Re: [PD] HDSP - ALSA - OSS - PD - Confusion)

[Iain Mott]

Yes - -alsa flag doesn't exist in my compilation of test 4. Thanks for 
the responses - will take a look at Jack. Is anyone out there using 
Pd/Jack/HDSP? - if so, any tips? eg. What version of Pd will work 
reliably? Command line arguments? etc
And yes Guenter, ALSA OSS seemed to have multichannel functionality (if 
that was what I accessed) - at least in the 8 output channels I tested.

Cheers, iain

_____
Iain Mott
www.reverberant.com

>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<

On 23/07/03, 5:07:07, Dan Neveu <neveu at buffalo.edu> wrote regarding alsa 
flag (was Re: [PD] HDSP - ALSA - OSS - PD - Confusion):


> at least for me on 0.37 test4, the alsa startup flag is not recognized
> (after compiling with --enable-alsa). it spits out the pd usage flag list
> and states "default audio API for this platform: OSS."

> -dan

> On Tue, 22 Jul 2003 matthijs at devdsp.net wrote:

> > PD uses OSS unless you specifically enable ALSA by invoking it thus:
> >
> > pd -alsa
> >
> >
> > On Tue, Jul 22, 2003 at 08:06:01AM +0000, Iain Mott wrote:
> > > Hello
> > >
> > > after a good deal of pain and discomfort I have a HDSP/Multiface unit
> > > running with ALSA (the latest CVS) and to my amazement just now, with Pd.
> > >
> > > The only version of Pd that seems to work with my setup is this CVS
> > > version (0.37 TEST 4) - (incidentally, fiddle~ seems to be broken in this
> > > release). I configured the compilation using the --enable-alsa flag,
> > > however I'm not certain it's actually using ALSA. When Pd starts in
> > > verbose mode I get the following print out:
> > >
> > >
> > > [iain at mother src]$ /home/iain/projects/puredata/pd/bin/pd -mididev 1
> > > -verbose -channels 18
> > > Pd version 0.37 TEST 4
> > > compiled 16:15:21 Jul 22 2003
> > > device 1: tried /dev/midi READ/WRITE; returned 3
> > > opened 1 MIDI input device(s) and 1 MIDI output device(s).
> > > input channels = 18, output channels = 18
> > > opened /dev/dsp for reading and writing
> > >
> > > opened audio output on /dev/dsp; got 18 channels
> > > bytes per sample = 2
> > > warning: OSS takes only power of 2 blocksize; using 227
> > > setting nfrags = 8, fragsize 9216
> > >
> > > audiobuffer set to 50 msec
> > > OSS: requested audio buffer size 79380 limited to 18432
> > > opened audio input device /dev/dsp; got 18 channels
> > > bytes per sample = 2
> > > OSS: issuing first ADC 'read' ... ...done.
> > > port 5400
> > > Waiting for connection request...
> > > TCL_LIBRARY="/home/iain/projects/puredata/pd/tcl/library"
> > > TK_LIBRARY="/home/iain/projects/puredata/pd/tk/library"
> > > "/home/iain/projects/puredata/pd/bin/pd-gui" 5400
> > > ... connected
> > >
> > > Does the above mean Pd is using "OSS emulation" and not ALSA proper? I'm
> > > pretty confused about the whole thing - hope someone can clarify what's
> > > going on. I notice the -alsa flag seems to be gone from this version of
> > > Pd - don't know if that has anything to do with it. Also, the setup seems
> > > to be limited to buffer sizes of 15msec and higher - any less and
> > > dropouts occur. How can I improve this? I'm currently running a Vanilla
> > > 2.4.20 kernel - will I need low latency patches etc?
> > >
> > > Cheers,
> > >
> > > Iain
> > >
> > > _____
> > > Iain Mott
> > > www.reverberant.com
> > >
> > >
> > > _______________________________________________
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> >
> > --
> > take care,
> >
> > Matthijs de Jonge
> > http://devdsp.net - news and resources for computer musicians
> >
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> >
> >
> >


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