Gqrx Output to Jack
Cary Honeywell
C wi
Robin Gape
Claire,
on Raspbian/Raspberry Pi OS, audio is routed using ALSA. ALSA permits one to set up loopback routes, which may be what you require. Even when PulseAudio is involved, loopback routes may be set up using the ALSA loopback infrastructure.
Sadly, I can't offer notes on the ALSA audio loopback facility, other than to remark that your favourite search engine is probably your friend. I recall that the facility needs a kernel module and configuration files, but memory is a little rusty, and current circumstances are conspiring against, for one reason and another.
73, HTH, Stay Safe,
Robin, G8DQX
Richard Bown
application so it will be possible to use a simultaneous
o/p to jack. However, I doubt if the facility was available on ubuntu 16
or raspberry os as the versions are much older.
It maybe available on ubuntu18, but later versions of ubuntu heavily
load the resources of the RPI3, and ubuntu20 is NOT useable, too much
latency.
Richard
On 16/07/2020 22:13, 'Robin Gape' via Gqrx SDR wrote:
>
> Claire,
>
> on Raspbian/Raspberry Pi OS, audio is routed using ALSA. ALSA permits
> one to set up loopback routes, which may be what you require. Even
> when PulseAudio is involved, loopback routes may be set up using the
> ALSA loopback infrastructure.
>
> your friend. I recall that the facility needs a kernel module and
> configuration files, but memory is a little rusty, and current
> circumstances are conspiring against, for one reason and another.
>
> 73, HTH, Stay Safe,
>
> Robin, G8DQX
>
> On 15/07/2020 15:40, C wi wrote:
>> Hi ,
>> Has there been any update on qjackctl to route gqrx ? I have tried but:
>> - Gqrx does not recognise qjack in the audio output
>> - When i start qjack in the background and gqrx is on, gqrx freezes,
>> when i turn off jack it stops freezing.
>> If somebody has any other alternatives to tools for either ubuntu or
>> raspbian to route audio with gqrx it would be great help!
>> Many thx
>> C
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--
Best wishes /73
Richard Bown
Email : ric...@g8jvm.com
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Robin Gape
Richard, Claire,
1) PulseAudio on Raspberry Pi OS (née Raspbian) causes grief if
one also hopes to use Bluetooth. Essentially Bluetooth audio
simply does not work when PulseAudio is running (tested with a Pi
4B), due to protocol stack issues. (Why that is so is quite
another question.)
2) For ALSA loopback, there is a short paper https://blog.getreu.net/_downloads/snd-aloop-device.pdf, from this site https://blog.getreu.net/_downloads/., which is quite detailed. Apologies for not providing the reference sooner.
3) I haven't yet had a chance to try QGRX under Ubuntu 20 on a Pi 4B, so can't usefully comment.
4) The internal architecture of the Pi 4's processor has much better support of USB, which is encouraging.
HTH, 73, Stay Safe,
Robin, G8DQX
Richard Bown
as I build the linux binaries for mshv, I wont have anything to do with
raspberry OS, too many problems, some due to daft debian philosophy,
I only use ubuntu 20 for RPI4B and ubuntu 18 for RPI3b and odroid
xu4/C2/C4 etc, Linux mint 20 for amd64
Too much grief to get anything to work on a stone-age OS , that's my opinion
Richard
On 17/07/2020 20:40, 'Robin Gape' via Gqrx SDR wrote:
>
> Richard, Claire,
>
> 1) PulseAudio on Raspberry Pi OS (née Raspbian) causes grief if one
> also hopes to use Bluetooth. Essentially Bluetooth audio simply does
> not work when PulseAudio is running (tested with a Pi 4B), due to
> protocol stack issues. (Why that is so is quite another question.)
>
> You received this message because you are subscribed to the Google
> Groups "Gqrx SDR" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to gqrx+uns...@googlegroups.com
> <mailto:gqrx+uns...@googlegroups.com>.
> To view this discussion on the web visit
> <https://groups.google.com/d/msgid/gqrx/0c991262-b872-97ee-edf8-5f2fd6611aab%40googlemail.com?utm_medium=email&utm_source=footer>.