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Re: [Discuss-gnuradio] gqrx in MacPorts

From: Alexandru Csete
Subject: Re: [Discuss-gnuradio] gqrx in MacPorts
Date: Mon, 12 Aug 2013 17:06:20 +0200

Hi Michael,

I wasn't very clear in my original explanation so let me try again.

If you build gqrx using:

$ qmake
$ make

Then gqrx will be built without any portaudio specific code. It will
use gr-audio for both audio input and output, whcih in turn will use
the native OS X backend unless the user configures gnuadio to use
something else. This will work just fine except that input source is
broken so no funcube dongle support and gqrx will not be able to
enumerate the available audio devices (gr-audio does not have such

If you build gqrx using:

$ qmake AUDIO_BACKEND=portaudio
$ make

then gqrx will use portaudio specific code meaning:
- It will set the GR_CONF_AUDIO_AUDIO_MODULE environment setting to
portaudio so that gnuradio will use the portaudio backend regardless
of what the user has configured (I assumed that 99% of gqrx on the Mac
users have no idea that they can configure gnuradio via
- It will use portaudio API functions to enumerate the avaialble audio
devices and present that to the user. This is used for both input
devices and output devices.

Because of the last point portaudio is a build time option in gqrx.


On Mon, Aug 12, 2013 at 3:20 PM, Michael Dickens <address@hidden> wrote:
> Hi Alex - In MacPorts (currently), one can install any of the GNU Radio
> ports with PortAudio using the +portaudio or +full variants.  Neither is the
> default.  If GNU Radio is installed with the PortAudio option, can gqrx make
> use of it?  Or, does gqrx have to be configured (and built) using
> AUDIO_BACKEND=portaudio?  Seems like gqrx might be able to select the audio
> interface at boot time from those available, maybe even tell gnuradio-audio
> which interface to use?  Just trying to think outside the box ... - MLD
> On Aug 9, 2013, at 11:46 AM, Alexandru Csete <address@hidden> wrote:
> > That's good news, thanks.
> > Regarding using portaudio in gqrx, there is no detection and you need
> > to include AUDIO_BACKEND=portaudio when running qmake to enable it. Or
> > insert it in the gqrx.pro file. I don't remember if portaudio was
> > optional for gnuradio or it just got installed. It was just a quick
> > hack and I'll try to improve but it is limited how much auto detection
> > I can do with qmake. I guess I'll just have to do the cmake-thing...

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