Re: [Discuss-gnuradio] Audio source cannot use 2 outputs (Stereo) in windows

[CEL]

Hey Gary,
please keep things on the list! Good news:
That's the exact opposite of what I wanted to convey! *Use* GNU Radio's
existing portaudio interface; chances are that your GNU Radio
installation supports that (which is why I asked how you've installed
it).
https://www.gnuradio.org/doc/doxygen/page_audio.html tells us how to do
that:
you just need to find your GNU Radio configuration (for me as Unix user
it's in ~/.gnuradio/config.conf, but yours is probably somewhere else;
running `gnuradio-config-info --userprefsdir` should give you an idea
where to look). Add, if not already in there, the following:

[audio]
audio_module = portaudio

Done! That tells GNU Radio to not just try the first best guess of what
audio system you want to use (that being windows API under windows),
but to specifically use portaudio – and that should have the features
you're looking for.

Still, the windows source not working as it should is a pain. We should
fix that. 

Best regards,
Marcus

On Sat, 2019-05-04 at 08:05 +0100, address@hidden wrote:
> Many thanks for the explanation. Looks like I can go no further. I do
> not have the skills to develope the audio source. 
> 
> Gary
> 
> Sent from my Huawei Mobile
> 
> 
> -------- Original Message --------
> Subject: Re: [Discuss-gnuradio] Audio source cannot use 2 outputs
> (Stereo) in
> windows
> From: "M黮ler, Marcus (CEL)" 
> To: address@hidden,address@hidden
> CC: 
> 
> 
> > Hi Gary!
> > 
> > > I have double checked and all the windows audio devices I have
> > > used 
> > > for the audio source are 2 channels.
> > 
> > I never doubted that – all I wanted to point out that the I think
> > it
> > was Windows that told the GNU Radio windows audio source it saw
> > only
> > one channel, and consequently the windows audio source only enabled
> > one
> > output port.
> > 
> > I was wrong, it turns out! When you look at gr-
> > audio/liob/windows/windows_source.cc, you'll find the number of
> > output
> > streams of the block to be hardcoded to be between 1 and 1, so...
> > 1:
> > 
> > 
> > windows_source::windows_source(int sampling_freq,
> > const std::string
> > device_name)
> > : sync_block("audio_windows_source",
> > io_signature::make(0, 0, 0),
> > io_signature::make(1, 1,
> > sizeof(float))),
> > 
> > The last line does that.
> > So, that's a um, underdeveloped feature in the windows audio
> > source.
> > 
> > > 
> > > They work fine with WSJT-X, or MAP65.
> > > 
> > > The stereo channels I wish to use are the I and Q outputs from
> > my 
> > > SDRPLay Duo using virtual cables
> > > 
> > > (I have tried the speaker outputs from the PC with GNURadio audio
> > > source 
> > > and get the same problem)
> > > 
> > > Does the audio source work with two channels on linux?
> > 
> > Yes, (haven't tried today, but it /used/ to work), but it sadly
> > shares
> > nearly no code with the windows audio source. That's due to fact
> > that
> > Linux' ALSA and Windows' sound API and OS X's Core Audio are pretty
> > different.
> > 
> > I do have an idea, though, which *might* be a solution to your
> > problem,
> > but: untested; don't expect wonders.
> > 
> > Has your GNU Radio build portaudio enabled? As said, it's not
> > tested,
> > but unlike the windows audio source, the portaudio source at least
> > from
> > the state of the source code (far as I can tell) enables as many
> > maximum output streams as your card has.
> > > 
> > > I am using the latest version of GNURadio 3.7.13.4 on a 64bit win
> > 10
> > > PC.
> > > 
> > 
> > Built from source, or where did you happen across it?
> > 
> > > I am really stuck here. Nothing I try allows the second output to
> > be 
> > > enabled.
> > > 
> > 
> > Sorry to hear that! We'll try to get you unstuck :)
> > 
> > Best regards,
> > Marcus

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