Redirection? (I do find some of the strangest things.) Post: 302989240

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Top Forums UNIX for Advanced & Expert Users Redirection? (I do find some of the strangest things.) Post 302989240 by wisecracker on Tuesday 10th of January 2017 09:39:41 AM

01-10-2017

Registered User

Quote:

Originally Posted by RudiC

Did you check the exit code of the command in either case?

No. As it is unimportant; I just don't want it to show nor crash out when a relatively serious error occurs but to be ignored. These are three lines in the code to suit:-
1) \dev\dsp for CygWin, OSS and PulseAudio for Linux.
2) ALSA for Linux ALSA sound systems.
3) OSX 10.12.x or maybe earlier.
If any one fails just ignore and carry on to the next. One of them will work.

Code:

# CygWin /dev/dsp, Linux OSS or PulseAudio.
> /dev/null 2>&1 cat /tmp/noise.raw > /dev/dsp
# Linux ALSA.
aplay /tmp/noise.wav > /dev/null 2>&1
# Apple OSX 10.12.x and greater.
afplay /tmp/noise.wav > /dev/null 2>&1

As Apple OSX 10.7.x at least has 'afplay' by default on a virgin install then there should be no reason for the code to fail.
CygWin(64) has /dev/dsp in a default virgin install.
Linux is variable as it could have either ALSA, OSS or PulseAudio sound systems.

wisecracker

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LEARN ABOUT DEBIAN

aoss

AOSS(1) 						      General Commands Manual							   AOSS(1)

NAME

       aoss - Wrapper script to facilitate use of the ALSA OSS compatibility library.

SYNOPSIS

       aoss osscommand [arguments]

DESCRIPTION

       aoss  is  a  simple wrapper script which facilitates the use of the ALSA OSS compatibility library. It just sets the appropriate LD_PRELOAD
       path and then runs the command.

       This is useful in cases where routing settings (which can be made in your .asoundrc file) need to be applied to commands that use  the  OSS
       API.

       Examples of asoundrc configuration:

       pcm.dsp0 {      type plug      slave.pcm "hw:0,0" }

       or

       pcm.dsp0 {      type plug      slave.pcm "dmix" }

       In  the	above  configuration  examples,  the pcm.dsp0 definition is used to wrap calls do /dev/dsp0. You can also wrap usage of /dev/dsp1,
       /dev/dsp2, etc. by defining pcm.dsp1, pcm.dsp2, etc..

       The PCM name to open can be given explicitly via ALSA_OSS_PCM_DEVICE environment variable, too.	This overrides the default dsp0, etc.

       Note on mmap: aoss mmap support might be buggy. Your results may vary when trying to use an application that uses mmap'ing  to  access  the
       OSS device files.

   Arguments
       osscommand
	      A command that uses the OSS API

       arguments
	      The appropriate arguments and options for the OSS command.

       AUTHORS
	      The OSS compatibility library is by Abramo Bagnara <abramo@alsa-project.org>.  The aoss script and this document are by James Tappin
	      <james@xena.uklinux.net>.

								  3 October 2001							   AOSS(1)