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

[Dan Neveu]

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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