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Old 05-08-2012, 05:09 AM   #1
Registered: Apr 2006
Location: Athens, Greece
Distribution: slackware, debian, ubuntu
Posts: 638

Rep: Reputation: 36
using sbopkg to build and inst an audio queue fails in lapspa_sdk

hello everyone,
I created an audio queue in sbopkg.
the problem is with ladspa_sdk. after building some plugins it requests that I listen to some whitenoise and it halts there

from the sbopkg log file
../bin/analyseplugin ../plugins/

Plugin Name: "White Noise Source"
Plugin Label: "noise_white"
Plugin Unique ID: 1050
Maker: "Richard Furse (LADSPA example plugins)"
Copyright: "None"
Must Run Real-Time: No
Has activate() Function: No
Has deactivate() Function: No
Has run_adding() Function: Yes
Environment: Normal or Hard Real-Time
Ports: "Amplitude" input, control, 0 to ..., default 1, logarithmic
"Output" output, audio

../bin/applyplugin -s 1 \
../snd/noise.wav /tmp/test.wav \
../plugins/ lpf 500 \
../plugins/ lpf 500 \
../plugins/ sine_fcaa 6000 \
../plugins/ delay_5s 1 0.1 \
../plugins/ amp_mono 4 \

Peak output: 27349.5
First listen to the white noise input signal:
sndfile-play ../snd/noise.wav

Using the SBo repository for Slackware 13.37
Queue Process: Build and install
it stayed at that point the whole night
i pressed enter but nothing changed.
I had to ctrl+c the process..

obviously that is not optimal - there are about 40 more stuff that are waiting in queue

there seem to be no option to avoid listening to the streams while the build - install process is ongoing..

is there a solution?

Thank you for your help

EDIT: I should warn you, this slack machine is a vmguest and the real audio output is done through the virtualbox Intel Audio device...

It seems to identify it properly :
nass@starmass:~$ aplay -L
Discard all samples (playback) or generate zero samples (capture)
HDA Intel, STAC92xx Analog
Default Audio Device
HDA Intel, STAC92xx Analog
Front speakers
HDA Intel, STAC92xx Analog
4.0 Surround output to Front and Rear speakers
HDA Intel, STAC92xx Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
HDA Intel, STAC92xx Analog
5.0 Surround output to Front, Center and Rear speakers
HDA Intel, STAC92xx Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
HDA Intel, STAC92xx Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
HDA Intel, STAC92xx Digital
IEC958 (S/PDIF) Digital Audio Output

Last edited by nass; 05-08-2012 at 05:19 AM.
Old 05-08-2012, 07:20 AM   #2
Registered: Apr 2006
Location: Athens, Greece
Distribution: slackware, debian, ubuntu
Posts: 638

Original Poster
Rep: Reputation: 36
ok so the problem was simple (once again)

I hadn't initialised the sound on the vm.

alsaconf would usually identify the card and init it , but apparently it fails to do so sometimes.

alsactl init
should be run by hand.

then sndfile-play works correctly and the build can continue


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