[Vm-dev] Re: [squeak-dev] Re: How can I listen to my app?

[Eliot Miranda]

On Fri, Sep 12, 2014 at 8:44 AM, Chris Muller <asqueaker at gmail.com> wrote:

> On Thu, Sep 11, 2014 at 6:38 PM, David T. Lewis <lewis at mail.msen.com>
> wrote:
> > On Thu, Sep 11, 2014 at 02:47:55PM -0500, Chris Muller wrote:
> >>
> >> On Thu, Sep 11, 2014 at 2:42 PM, Chris Muller <asqueaker at gmail.com>
> wrote:
> >> > I've decided I want to get a feel for what my app is doing and at what
> >> > rate by, literally, listening to it.  I want to put in some brief
> >> > beeps into strategic locations.
> >> >
> >> > But sound is an area where I have exactly zero experience.  I want the
> >> > sounds to play but with minimal impact on the running program; i.e.,
> >> > I'm willing to make the beeps very short, but even a 10ms beep (would
> >> > I even be able to hear that?) would slow the program down.
> >> >
> >> > And yet, if I tried to play them in the background, they will not be
> >> > in-sync with with the real-time state of the app.  I suppose another
> >> > option would be to record the events I'm interested in and their time
> >> > and play them back later, but I'm more interested in the *real-time*
> >> > state.
> >> >
> >> > Finally, how can I play any sound at all with Squeak and Cog on Linux?
> >> >  When I try some of the demo sounds on FMSound, there is no sound and
> >> > I see this message in the console:
> >> >
> >> >     sound: /dev/dsp: No such file or directory
> >> >
> >> > Of course, no other apps on this machine have any trouble playing
> >> > sounds, so is something simply pointing in the wrong place?
> >>
> >> squeak -help reports:
> >>
> >> Available drivers:
> >>   vm-sound-null
> >>   vm-sound-ALSA
> >>   vm-sound-OSS
> >>
> >> But when I try:
> >>
> >>    squeak -vm sound=ALSA my.image
> >>
> >> and try to play a sound I get this on the console:
> >>
> >>    sound_Start(default)
> >>    soundStart: snd_add_pcm_handler: Function not implemented
> >>
> >
> > Sound works fine on my trusty SuSE box, but not at all on my
> user-friendly
> > but generally untrustworthy Ubuntu laptop. What kind of system are you
> using?
>
> I'm using one of the most popular Linux distros, Ubuntu.
>
> I tried the -vm-sound-alsa switch to the vm (instead of -vm
> sound=ALSA) but the same message is produced on the console when I try
> to "FMSound pluckedElecBass play".
>
>    sound_Start(default)
>    soundStart: snd_add_pcm_handler: Function not implemented
>
> Does this mean that Cog does not support sound?  Using "-vm sound=OSS"....
> .....
> WAIT!!!
> ....
> Success!!!
>
> I managed to get a sound out of Cog by:
>
>   1) copying so.vm-sound-pulse from my interpreter VM lib directory to
> Cog's lib directory
>   2) renaming so.vm-sound-pulse to vm-sound-pulse
>   3) setting execute permissions on vm-sound-pulse
>
> With that, I can actually get sound out of Squeak..
>
> And, now, when I do squeak -help, "vm-sound-pulse" is now listed.
>
> Eliot, do you think we could eventually include this driver in your
> Cog releases?
>

I've no objection.  Any one want to volunteer to get this working for the
Cog builds?

> Sound systems have been changing on Linux distributions, and I suspect
> that
> > we may be falling behind in our support for this.
> >
> > Dave
> >
> >
>
>


-- 
best,
Eliot
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