[Discuss-gnuradio] Audio source cannot use 2 outputs (Stereo) in windows
Hi Marcus and anyone who can help. I have double checked and all the windows audio devices I have used for the audio source are 2 channels. 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? I am using the latest version of GNURadio 3.7.13.4 on a 64bit win 10 PC. I am really stuck here. Nothing I try allows the second output to be enabled. Regards Gary On 02/05/2019 10:00, Müller, Marcus (CEL) wrote: Hi Gary, since we acutely changed things in the Windows audio sink: What's your version of GNU Radio? Generally, Windows seems to be of the conviction that the audio device you're trying to record from only has one, not two channels. Best regards, Marcus On Thu, 2019-05-02 at 08:53 +0100, Gary.Simpkins wrote: Hi. Anyone who can help. Try as I may I cannot get a second port working using the audio source block. When I set the number of outputs to 2 for stereo (as in the documentation) I get the error below. File "C:\Users\Gary\Documents\top_block.py", line 109, in main() File "C:\Users\Gary\Documents\top_block.py", line 97, in main tb = top_block_cls() File "C:\Users\Gary\Documents\top_block.py", line 75, in __init__ self.connect((self.audio_source_0, 1), (self.audio_sink_1, 0)) File "C:\GNURadio-3.7\lib\site-packages\gnuradio\gr\hier_block2.py", line 47, in wrapped func(self, src, src_port, dst, dst_port) File "C:\GNURadio-3.7\lib\site-packages\gnuradio\gr\hier_block2.py", line 110, in connect self.primitive_connect(*args) File "C:\GNURadio-3.7\lib\site-packages\gnuradio\gr\runtime_swig.py", line 5312, in primitive_connect return _runtime_swig.top_block_sptr_primitive_connect(self, *args) ValueError: port number 1 exceeds max of 0 Am I missing something? Gary ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Audio source cannot use 2 outputs (Stereo) in windows
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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