[squeak-dev] Squeak sound on Unix; potential improvement found in old code

H. Hirzel hannes.hirzel at gmail.com
Thu Mar 23 06:32:13 UTC 2017

On 3/23/17, David T. Lewis <lewis at mail.msen.com> wrote:
> On Wed, Mar 22, 2017 at 02:55:17PM -0700, tim Rowledge wrote:
>> I???ve been doing some swiki-cleaning and stumbled upon
>> http://wiki.squeak.org/squeak/263
>> wherein Lex Spoon had written some code to drive the /dev/dsp sound device
>> doohickey on unix. Since it claimed to be able to support low-latency
>> sound playing, this may be useful to those of you interested in making
>> noises.
>> It???s old, possibly wrong, but it???s there awaiting attention from
>> someone with a bit of appropriate knowledge.
> Nice find. A lot of what Lex did is worth a second look :-)
> Quite a bit has changed in the intervening years with respect to sound on
> Squeak and Linux. For example, there is no longer such a thing as /dev/dsp
> on my Ubuntu box, or on my Raspberry Pi. I think that device was associated
> with an older sound system (OSS). Nevertheless, the basic idea of the mmap
> driver interface may be applicable to something.
> Just a sanity check - do you have sound with whatever VM you are using? I
> have some VMs that seem to have trouble finding -vm-sound-pulse, possibly
> due to build system issues.

No, for the current setup I am using on Ubuntu 14.04 and a recent
all-in-one (Squeak 6.0a trunk  **) sound does not work. In other
programs sound works on the machine

** http://files.squeak.org/6.0alpha/Squeak6.0alpha-17042-32bit/

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Virtual Machine
Croquet Closure Cog[Spur] VM [CoInterpreterPrimitives VMMaker.oscog-cb.1919]
Unix built on Aug 17 2016 18:35:40 Compiler: 4.6.3
platform sources revision VM: 201608171728
https://github.com/OpenSmalltalk/opensmalltalk-vm.git $ Date: Wed Aug
17 10:28:01 2016 -0700 $ Plugins: 201608171728
https://github.com/OpenSmalltalk/opensmalltalk-vm.git $
CoInterpreter VMMaker.oscog-cb.1919 uuid:
00a8dd2a-bc8d-4552-b400-be781c8aabec Aug 17 2016
StackToRegisterMappingCogit VMMaker.oscog-cb.1919 uuid:
00a8dd2a-bc8d-4552-b400-be781c8aabec Aug 17 2016

Loaded VM Modules
B2DPlugin VMMaker.oscog-eem.1886 (i)
BitBltPlugin VMMaker.oscog-eem.1914 (i)
FilePlugin VMMaker.oscog-eem.1851 (i)
FloatArrayPlugin VMMaker.oscog-eem.1891 (i)
ImmX11Plugin VMMaker.oscog-eem.1716 (e)
LargeIntegers v2.0 VMMaker.oscog-eem.1886 (i)
Matrix2x3Plugin VMMaker.oscog-eem.1851 (i)
MiscPrimitivePlugin VMMaker.oscog-eem.1902 (i)
SecurityPlugin VMMaker.oscog-eem.1702 (i)
SocketPlugin VMMaker.oscog-eem.1809 (i)
SoundPlugin VMMaker.oscog-eem.1809 (i)

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