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

On Thu, Sep 11, 2014 at 6:38 PM, David T. Lewis <[hidden email]> 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 <[hidden email]> 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?

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

Apologies for the confusion but to summarize what I found:

- The 32-bit standard interpreter VM for Linux on squeakvm.org has all of the
  usual vm-sound-* modules, and should work as expected.

    http://squeakvm.org/unix/release/Squeak-4.10.2.2614-linux_i386.tar.gz

- The 64-bit standard interpreter VM for Linux on squeakvm.org is missing some
  of the vm-sound-* modules. For this reason, if you downloaded an interpreter
  VM for your 64-bit Linux system, you may not have sound.

    http://squeakvm.org/unix/release/Squeak-4.10.2.2614-linux_x86_64.tar.gz

- If you have the 64-bit intepreter VM, you should be able to replace it
  with the 32-bit interpreter VM if you need sound. Or, if you prefer to
  keep the 64-bit VM, you may be able to add the attached vm-sound modules
  from a VM that I compiled on my PC. YMMV, absolutely no guarantees.

- For Cog, there may be a problem with the build procedure that is causing
  problems with the vm-sound-* modules. I do not yet know the reason,
  although you may be able to use the vm-sound-* modules from the 32-bit
  interpreter VM (I think there was a success report for this earlier in
  this thread).

HTH,

Dave

On Mon, Sep 15, 2014 at 11:57:05AM -0400, David T. Lewis wrote:
> Hi St?phane,

>
> I am travelling, so I cannot post anything now. But I will send you a copy
> of the missing vm-sound modules as soon as I can.
>
> I prefer not to post a compiled VM, because I think this should come from
> squeakvm.org/unix if possible. That said, I had not realized that we were
> missing some sound modules from the last official build, so we should make
> this available as a fix.
>
> Are you able to compile programs on your own Linux box? It's really quite
> easy to make an interpreter VM nowadays, and I would be happy show you how
> to do this if you are willing to give it a try.
>
> Dave
>
> >
> >> My apologies to Ubuntu, it seems that I neglected to install the sound
> >> development libraries on my Ubuntu laptop before compiling the VM. That
> >> done, sound works fine with the -vm-sound-pulse driver on Ubuntu.
> >
> > Could you please make this binary available somewhere ?
> >
> > Best,
> >
> > Stef
> >
> >
>