Regards
Guru
---------- Forwarded message ----------
From: "Guru Prasad" <gurup...@buffalo.edu>
Date: May 7, 2015 12:19 PM
Subject: Re: Re[2]: [Alsa-user] Sending all audio over socket
To: "Sergei Steshenko" <steshenko_ser...@list.ru>
Cc:
Yes you are correct.
However, what I'm pointing out is that using a named pipe causes all
applications using the audio to block.
For example, if I start Firefox and load a YouTube video, Firefox will hang
until I start reading from the named pipe.
Now this can be solved by either starting my program on boot (not something
I want to be _forced_ to do) or by asking my program to reload ALSA.
Regards
Guru
On May 7, 2015 12:06 PM, "Sergei Steshenko" <steshenko_ser...@list.ru>
wrote:
> "
> However, all (audio) applications freeze until my program (which reads
> from the pipe) begins to run. This is expected behaviour of named
> pipes.
>
> I believe I can solve this by modifying the PCM 'default' dynamically.
> "
>
> - well, to me it sounds like your "overall" application should be a
> multi-threaded one - one of the threads reads audio stream, waiting for
> data as necessary (you call it "freeze") while other threads check the
> status of the audio reading thread.
>
> ...
>
> Your whole IPC, including over the network part, can be implemented (or,
> say, prototyped) using a scripting language and utilities like 'cat',
> 'netcat' - the latter for the networking part.
>
> Regards,
> Sergei.
>
>
> Четверг, 7 мая 2015, 8:25 -04:00 от Guru Prasad <gurup...@buffalo.edu>:
>
> I had some luck with the named pipe setup. I was able to set up
> .asoundrc to write to a named pipe in /tmp and then send this data
> over a socket and play it on another machine.
> However, all (audio) applications freeze until my program (which reads
> from the pipe) begins to run. This is expected behaviour of named
> pipes.
>
> I believe I can solve this by modifying the PCM 'default' dynamically.
> That way, I can modify the PCM at the start of my program to use my
> custom .asoundrc.
> Is it possible to:
> 1) Modify PCM 'default' on the fly?
> 2) Re-initialize ALSA with a new .asoundrc without
> rebooting/restarting the desktop manager?
>
>
> @Anders:
> I tried that approach already with no luck. For some reason when I
> include snd-aloop to my modules, aplay -L does not show any of the
> loopback devices.
>
>
> On Thu, May 7, 2015 at 3:01 AM, Anders Genell <anders.gen...@gmail.com
> <https://e.mail.ru/compose?To=anders.gen...@gmail.com>> wrote:
> >
> >> 7 maj 2015 kl. 05:23 skrev Guru Prasad <gurup...@buffalo.edu
> <https://e.mail.ru/compose?To=gurup...@buffalo.edu>>:
> >>
> >> Could you give me an example of how I can ask the PCM file plugin to
> >> write to a named pipe?
> >> Should i create this manually or can I somehow do this via the PCM
> >> file plugin itself by using the '|' character?
> >>
> >> Also, don't named pipes block until there is a reader? Given that I've
> >> only been able to do this via .asoundrc (and not via the
> >> snd_pcm_file_open), I'm not sure how the blocking behaviour would
> >> interact with ALSA. Would only my file plugin PCM definition block
> >> while others continue?
> >>
> >> Regardless, thank you for the suggestion. I will try this out meanwhile.
> >>
> >> Regards
> >> Guru
> >
> > Maybe this could be a starting point?
> >
> > http://plasmasturm.org/log/soundserverhack/
> >
> > Regards,
> > /Anders
> >
> >
>
>
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