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Re: Debian Stretch Am Confused about /dev/dsp

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  Re: Debian Stretch Am Confused about /dev/dsp Greg Wooledge <wooledg@eeg.ccf.org> - 2018-08-30 19:20 +0200
    Re: Debian Stretch Am Confused about /dev/dsp "Martin McCormick" <martin.m@suddenlink.net> - 2018-08-30 22:20 +0200
      Re: Debian Stretch Am Confused about /dev/dsp Dan Ritter <dsr@randomstring.org> - 2018-08-31 00:10 +0200
      Re: Debian Stretch Am Confused about /dev/dsp didier gaumet <didier.gaumet@gmail.com> - 2018-08-31 10:00 +0200
        Re: Debian Stretch Am Confused about /dev/dsp Ric Moore <wayward4now@gmail.com> - 2018-08-31 10:20 +0200

#199638 — Re: Debian Stretch Am Confused about /dev/dsp

On Thu, Aug 30, 2018 at 12:14:57PM -0500, Martin McCormick wrote:
> 	After successfully installing stretch on a system, there
> was no /dev/dsp.  I needed to play some mp3 files and so
> installed mplayer.  [...]

/dev/dsp is part of the legacy OSS (Open Sound System) interface.  If
you play audio using only ALSA, or ALSA + Pulse, you do not need this
older interface.

If your software requires the /dev/dsp interface (because it predates
ALSA), you can try loading the snd-pcm-oss module.  At least, that's
what the IRC bot says to do.

It also pointed me to <http://wiki.debian.org/ReleaseGoals/NoLinuxDevDsp>,
if that's of any help.

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#199642

Greg Wooledge <wooledg@eeg.ccf.org> writes:
> /dev/dsp is part of the legacy OSS (Open Sound System) interface.  If
> you play audio using only ALSA, or ALSA + Pulse, you do not need this
> older interface.
> 
> If your software requires the /dev/dsp interface (because it predates
> ALSA), you can try loading the snd-pcm-oss module.  At least, that's
> what the IRC bot says to do.

	Thank you.  I am happy to report that adding snd-pcm-oss to
/etc/modules brought the /dev/dsp interfaces back.

	I never did a lsmod on the system a week or so ago to see
what was there when I first saw /dev/dsp and /dev/dsp1 and it
could be that the snd-pcm-oss module was loaded as a result of
installing mplayer although mplayer does not need /dev/dsp and
works fine without it.

	When I shut down the system and restarted it today, i did
do lsmod looking for snd-pcm-oss and it was not there.  After
placingthe name of the module in /etc/modules, I rebooted so as
to start from scratch and it was there along with /dev/dsp and
/dev/dsp1 for the usb device which now works like a charm.

	I must read up on how to code for not needing /dev/dspx
to fix the real issue here.

	The software I wrote doesn't predate oss but some
documentation I red years ago that probably does predate oss was
what I used to wrige some C routines that send and receive sound
plus use ioctl to set, say, /dev/dsp or /dev/dsp1 for stereo at
32000 samples per second.

	I used that to make a stereo sound card record 2
independent 8-K 8-bit audio channels from two radio scanners

	Music stinks when recorded that way but scanner audio has
such a limited pass band that it sounds pretty decent.

	Many thanks.

> It also pointed me to <http://wiki.debian.org/ReleaseGoals/NoLinuxDevDsp>,
> if that's of any help.

	I will save this message and also learn the correct way
to send and receive audio these days.

Martin

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#199644

On Thu, Aug 30, 2018 at 03:10:24PM -0500, Martin McCormick wrote:
> 	The software I wrote doesn't predate oss but some
> documentation I red years ago that probably does predate oss was
> what I used to wrige some C routines that send and receive sound
> plus use ioctl to set, say, /dev/dsp or /dev/dsp1 for stereo at
> 32000 samples per second.
> 
> 	I used that to make a stereo sound card record 2
> independent 8-K 8-bit audio channels from two radio scanners
> 
> 	Music stinks when recorded that way but scanner audio has
> such a limited pass band that it sounds pretty decent.
> 
> 	Many thanks.
> 
> > It also pointed me to <http://wiki.debian.org/ReleaseGoals/NoLinuxDevDsp>,
> > if that's of any help.
> 
> 	I will save this message and also learn the correct way
> to send and receive audio these days.

I think that 'sox' which can also be called as 'play' or 'rec'
is what you want.

Use rec to record from sound-input, and sox to split it by
channel into two files.

-dsr-

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#199647

Hello,

from what I understand, using alsa-oss would be better than using the
OSS emulation module, partircularly if one is to use sound plug-ins?
 https://packages.debian.org/stretch/alsa-oss

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#199648

On 08/31/2018 03:51 AM, didier gaumet wrote:
> Hello,
> 
> from what I understand, using alsa-oss would be better than using the
> OSS emulation module, partircularly if one is to use sound plug-ins?
>   https://packages.debian.org/stretch/alsa-oss

If you use pulse you can execute your program using the prefix "padsp" 
Kino still requires /dev/dsp so you would launch it using padsp kino
Works a charm. Ric

-- 
My father, Victor Moore (Vic) used to say:
"There are two Great Sins in the world...
..the Sin of Ignorance, and the Sin of Stupidity.
Only the former may be overcome." R.I.P. Dad.
http://linuxcounter.net/user/44256.html

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