[PD] keeping Pd DSP alive

[Chris Clepper]

Non-interleaved meaning data is sent (L,L,L then R,R,R per block) rather
than the usual I2S/TDM method of interleaving channels per sample?

The ALSA folks have some mmap example code here that looks like a pretty
generic interface:

http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_8c-example.html

I will build that and see if the SoC hardware likes the mmap calls.


Thanks!


On Sun, Apr 13, 2014 at 8:46 PM, Miller Puckette <msp at ucsd.edu> wrote:

> Drat.
>
> The mmap code only works for non-interleaved memory map interfaces.  The
> only device I know of that works with the is the RME Hammerfall series.
>
> I don't know if alsa supports any sort of mmap-ing for your hardware, but
> if so (and I guess it would be interleaved in that case) it might be worth
> hacking the mmap code to try that.  It sounds less likely to hang than the
> read/write interface would be.
>
> cheers
> Miller
>
> On Sun, Apr 13, 2014 at 04:42:04PM -0400, Chris Clepper wrote:
> > I could not get PortAudio to work on ARM at all and Jack has issues with
> > duplex low latency.
> >
> > What's the deal with the ALSA mmap code?  Doesn't that use callbacks?
> >
> >
> > On Sun, Apr 13, 2014 at 2:55 PM, Miller Puckette <msp at ucsd.edu> wrote:
> >
> > > You might have already tried this, but it might work better to use
> > > portaudio to get to ALSA - it can connect with ALSA using callbacks
> > > which the built-in ASA code doesn't.  I don't know what difference this
> > > will make but perhaps it will help.
> > >
> > > (try compiling with and without FAKEBLOCKING and THREADSIGNAL defined
> in
> > > s_audio_pa.c).
> > >
> > > cheers
> > > Miller
> > >
> > > On Sat, Apr 12, 2014 at 07:26:56PM -0700, Jonathan Wilkes wrote:
> > > > There isn't a way to poll the DSP state in Pd Vanilla.
> > > >
> > > > -Jonathan
> > > >
> > > > On Saturday, April 12, 2014 8:47 PM, Chris Clepper <
> cgclepper at gmail.com>
> > > wrote:
> > > >
> > > > [pdinfo] is not part of vanilla.  I can't (nor want to) use extended
> for
> > > this project.
> > > >
> > > > On Saturday, April 12, 2014, Jonathan Wilkes <jancsika at yahoo.com>
> wrote:
> > > >
> > > > On 04/12/2014 04:27 PM, Chris Clepper wrote:
> > > > >
> > > > >Hi list
> > > > >>
> > > > >>
> > > > >>I'm wondering if there are any recommended ways to ensure DSP keeps
> > > running for long periods like permanent installations.  I get 'audio
> I/O
> > > stuck' popping up every few days, which is not bad, but ideally audio
> > > should stay running indefinitely.
> > > > >>
> > > > >>
> > > > >>I can send a [metro 1000] to [;pd DSP 1( to keep audio going, but
> is
> > > there any long term issue with doing that?  Will it reliably restart
> audio
> > > after Pd closes it?
> > > > >>
> > > > >>
> > > > >>Also, the internal message [;pd audiostate( only returns data to
> the
> > > console.  Perhaps there is a way to poll Pd for the internal DSP state
> and
> > > restart it if it dies?
> > > > >In Pd-l2ork:
> > > > >[dsp-status(
> > > > >|
> > > > >[pdinfo]
> > > > >
> > > > >-Jonathan
> > > > >
> > > > >
> > > > >
> > > > >>
> > > > >>Thanks!
> > > > >>
> > > > >>
> > > > >>
> > > > >>
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