Multiplatform sound IO with LabVIEW

We develop a commercial piece of software in LabVIEW which needs to do extensive sound output and input (professional internal and external soundcards, up to 16 channels, numerous bit depths and sampling rates with low latencies). This software is around 16 years old and when the project began there was not much in the way of standard libraries for sound I/O so we wrote a custom dll for doing windows API calls that we call from LabVIEW.
However, we are now interested in porting our software to Mac, Windows-64, and also supporting a pro-audio driver format (ASIO) in addition to the standard Windows WDM/MME drivers (in fact, we have already implemented a somewhat buggy interface for ASIO).
We would like to find a single technology that we could drop into our LabVIEW application to access soundcards on Win-32, Win-64, and Mac, additionally, if it supports ASIO on Windows that would be great.
The obvious and easiest place to look is the the built in LabVIEW VI's for doing Sound I/O, but, in talking with another company doing similar work, it appears that those VI's don't work nearly well enough (at least on Mac) for our needs.
A LabVIEW Mac user wrote to us:
"There are two sets of VI's for sound management in labview for Mac
- an old one, pretty limited but working, we are limited to 2 channels in and 2 out
- A new one which is supposed to give access to more parameters (choice of the sound input /output), better resolution ...) but unfortunately ... it doesn't work since few years ! External sound cards are not recognized and informations about the input and output are wrong
-I had some mail discussion last year for this bugs in LV 2010 with somebody of NI, and they are aware of the problem."
So, we are interested in finding a crossplatform sound I/O framework that could be called directly from LabVIEW, allowing us to create a cross platform, multichannel, multisoundcard, multisampling rate, LabVIEW sound interface.
Does anyone know of such a framework? In doing a little research I came accross a few, but I have no experience with them and whether they would fullfill our needs and could be utilized directly from LabVIEW without having to create wrappers for each target. Anyone have more perspective?
PortAudio appears to be an audio library designed for software that needs to be ported http://www.portaudio.com/
Fmod appears to be a commercial cross-platform API for sound: http://www.fmod.org/index.php/products
OpenAL is basically the sound version of OpenGL http://connect.creativelabs.com/openal/default.aspx

Anthony F wrote:
Thomas,
I would suggest the Sound and Vibration toolkit for advanced LabVIEW sound generation and analysis. You can find more information about this toolkit here:
http://sine.ni.com/nips/cds/view/p/lang/en/nid/12152
You may additionally need data acquisition hardware as I don't beleive this toolkit would readily interface with the external sound cards you are using.
And how would that solve any problem. The OP want to use a soundcard. So besides purchasing an expensive toolkit really NOT needed. The original poster will also be forced to purchase NI hardware what works very well. But are in high end then it comes to price range. You have not so many posting. So I guess you are quite new in the NI system. And I also know that in NI training. They are very focused on selling products. And for that I can not blame NI. They need to sell in order to develop So my advice to you. Spend some more time understanding what your customers REALLY need. Before recommending expensive hardware/software. A too eager sale strategy. Will backfire badly (rather) sooner or later.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

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Christi,
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[email protected]
Sent via Deja.com http://www.deja.com/
Before you buy.

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Cid
In article <87di90$dmv$[email protected]>,
Dorian Grey wrote:
>
>
> I have saved some sound clips into a matrix. Now I want to play the
> samples back (there are 10 of them) when I press the respective button
> (button 1 for sound 1, button 2 for sound 2, etc). My problem is I
can't
> get the sounds to play when I press the button. I've tried a case
> structure that would select the sound, but I also tried to let the
sound
> play (flipping a boolean). I can't get it to work. Does someone have a
> VI that I can get ideas, or does someone w
ant to chit-chat?
>
> *peace*
>
> DG
>
> [email protected]
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
>
Sent via Deja.com http://www.deja.com/
Before you buy.

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I've been stuck with this VI that's supposed let the user set the frecuency and volume of an audio file, and play it.
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Attachments:
Frecuency and Volume modification.vi ‏48 KB

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Dear,
I'm new to Labview and I have a question. A few weeks ago, we have bought a CompactDAQ system with among other things a USB-9233 card.
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Business Development Manager, Sound and Vibration
[email protected]

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Fredrik76 wrote:
Ok so I have to use the Labview interface instead of the sound and vibration toolkits interface? I see the sound out option in Labview where my card apperas but not in the sound and vibration toolkits interface. Guess I have to add the options for the analysis manually then?
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Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

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Dibujo.JPG ‏13 KB

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No TV sound - Problem with Pulseaudio and Gnome

Hi Community!
Since January 2013 I got big problems with the sound of my tvcard. The card is a Sundtek Media TV Pro. But after all the problems have nothing to to with the card itself!
So far I found out, that the problem is with Pulseaudio.
- Sound works under Windows on same PC.
- Sound don't work under Arch - not with tvtime, not with vlc, etc.
- Problem occurs even on a new installed system with the Arch-2013-02-01 install medium.
cat /etc/mediasrv.log
[1033] Pulseaudio connect reported an error (6 - Connection refused)
[1033] select error() in audio processor (can be caused because of pulseaudio) (Interrupted system call)
After setting up a new Arch installation with just xorg-server, gnome, tvtime and the sundtek driver from AUR I run journalctl -b:
Feb 10 16:25:15 hightower pulseaudio[636]: [pulseaudio] pid.c:
Daemon already running.
With sudo journalctl | grep 'Feb 10 16:2' I get the following output:
Feb 10 16:25:01 hightower rtkit-daemon[489]: Successfully made thread 488 of process 488 (/usr/bin/pulseaudio) owned by '120' high priority at nice level -11.
Feb 10 16:25:14 hightower rtkit-daemon[489]: Successfully made thread 606 of process 606 (/usr/bin/pulseaudio) owned by '1000' high priority at nice level -11.
Feb 10 16:25:15 hightower rtkit-daemon[489]: Successfully made thread 636 of process 636 (/usr/bin/pulseaudio) owned by '1000' high priority at nice level -11.
Feb 10 16:25:15 hightower pulseaudio[636]: [pulseaudio] pid.c: Daemon already running.
Feb 10 16:28:55 hightower pulseaudio[1000]: [pulseaudio] module-jackdbus-detect.c: Unable to contact D-Bus session bus: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
Feb 10 16:28:55 hightower pulseaudio[1000]: [pulseaudio] module.c: Failed to load module "module-jackdbus-detect" (argument:""): initialization failed.
Feb 10 16:28:55 hightower pulseaudio[1000]: [pulseaudio] socket-server.c: bind(): Die Adresse wird bereits verwendet
Feb 10 16:28:55 hightower pulseaudio[1000]: [pulseaudio] module.c: Failed to load module "module-esound-protocol-unix" (argument: ""): initialization failed.
Feb 10 16:28:55 hightower pulseaudio[1000]: [pulseaudio] main.c: Module load failed.
Feb 10 16:28:55 hightower pulseaudio[1000]: [pulseaudio] main.c: Module load failed.
Feb 10 16:28:55 hightower pulseaudio[1000]: [pulseaudio] main.c: Konnte Daemon nicht initialisieren.
Feb 10 16:28:55 hightower pulseaudio[997]: [pulseaudio] main.c: Start des Daemons fehlgeschlagen.
So, if I understand right, pulseaudio is alreade started by the rtkit-daemon and gnome couldn't start it again.
At https://bugs.archlinux.org/task/30926 I found a hint concerning /etc/xdg/autostart/pulseaudio.desktop and /etc/xdg/autostart/pulseaudio-kde.desktop.
After removing them from /etc/xdg/autostart and running journalctl -b there are no more errors.
With sudo journalctl | grep 'pulseaudio' I get:
sudo journalctl | grep 'Feb 10 17:4' | grep 'pulse*'
Feb 10 17:41:42 hightower rtkit-daemon[485]: Successfully made thread 484 of process 484 (/usr/bin/pulseaudio) owned by '120' high priority at nice level -11.
Feb 10 17:41:55 hightower rtkit-daemon[485]: Successfully made thread 625 of process 625 (/usr/bin/pulseaudio) owned by '1000' high priority at nice level -11.
In my opinion all looks ok! I also checked the channels with the alsamixer and it looks good, too.
So I ran vlc v4l2://:dev=/dev/video0:width=720:height=576:tuner-frequency=510750:adev=/dev/null:standard=255 - but still no sound.
With cat /var/log/mediasrv.log I checked the drivers logfile:
2013-02-10 17:48:55 [343] SETTING DVB-C
2013-02-10 17:48:55 [343] switching to analog TV
2013-02-10 17:48:56 [343] SETTING PAL/SECAM
2013-02-10 17:48:58 [343] invalid audio input selected: 2
2013-02-10 17:48:58 [343] Setting frequency: 510750000
2013-02-10 17:48:58 [343] Using settings for Europe
2013-02-10 17:48:58 [343] Set Pixelformat: 0 YUV 4:2:2 (YUYV)
2013-02-10 17:48:58 [1033] Starting audio processor (PID 1033)
2013-02-10 17:48:58 [1033] initializing audio in audio processor
2013-02-10 17:48:58 [1033] loaded local pulseaudio driver
2013-02-10 17:48:58 [1033] select error() in audio processor (can be caused because of pulseaudio) (Interrupted system call)
2013-02-10 17:48:59 [1033] Pulseaudio connect reported an error (6 - Connection refused)
2013-02-10 17:48:59 [1033] select error() in audio processor (can be caused because of pulseaudio) (Interrupted system call)
2013-02-10 17:48:59 [1033] Pulseaudio connect reported an error (6 - Connection refused)
I started tvtime again. This time I ran rm -rf ~/.config/pulse/ and killall pulseaudio to kill the Pulseaudio server. I instantly got a loud noise out of my speakers.
I closed tvtime and re-opened it. And there it was: TV SOUND OUT OF MY SPEAKERS!
But now, when I run pavucontrol I get:
Connection to PulseAudio failed. Automatic retry in 5s.
In this cas this is likely because PULSE_SERVER in the Environment/X11 root Windows Properties or default-server in client.conf is misconfigured.
This situation can also arrise when PulseAudio crashed and left stale details in the X11 Root Windows.
If this is the case, then PuseAudio should autospawn again, or if this is not configured you sould run start-pulseaudio-x11 manually.
I got the information from Sundtek, that Pulseaudio should not be started as system service. Instead, every user should have an own Pulseaudio daemon and that PA was concepted this way. But they don't know how it is implemented in ArchLinux.
I also don't know it exactly. So the question to all you ArchLinu pro's:
How is PA implemented in Arch? And how can I sustainable solve my problem?
Thank you for your time and help!
Durag

There is just one more thing I found out.
After logging into Gnome and running ps aux | grep pulse I get:
rebel 727 0.7 0.2 444316 10288 ? S<l 03:02 0:00 /usr/bin/pulseaudio --start --log-target=syslog
rebel 731 0.0 0.0 71236 2652 ? S 03:02 0:00 /usr/lib/pulse/gconf-helper
rebel 843 0.0 0.0 17396 1184 pts/0 D+ 03:03 0:00 grep pulse
To get the sound to work I run:
rm -rf .config/pulse/
killall pulseaudio
killall -9 pulseaudio
I again run ps aux | grep pulse
rebel 4016 4.2 0.2 510124 11528 ? Sl 03:06 0:02 /usr/bin/pulseaudio --start --log-target=syslog
rebel 4020 0.0 0.0 71368 2700 ? S 03:06 0:00 /usr/lib/pulse/gconf-helper
rebel 4046 0.0 0.0 19456 1216 pts/0 R+ 03:07 0:00 grep pulse
I can recognize that the STATs have changed. Maybe this can help to solve the problem?

Multiplatform sound IO with LabVIEW

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