Re: [Jack-Devel] How to get mplayer and firefox/flash to play

> Date: Tue, 20 Dec 2011 10:03:52 -0600
> From: "Chris Caudle" <[hidden]>
> To: [hidden]
>
> On Mon, December 19, 2011 9:37 pm, Paul Davis wrote:
> > why are you using netjack rather than just playing directly from
> > mplayer or firefox to JACK on the same host?
>
> Sounds like an X terminal kind of setup.
>
> > Robert M. Riches Jr. wrote:
> >> In setting up a zero-client arrangement
>
> I took that to be a setup where the client was very lightweight, and all
> the apps were running on a remote server but displayed on the client. JACK
> master would run on the display, and JACK running net backend would run on
> the server where the applications were running.
> You know these young ones are always coming up with new terms for
> reinventing X terminals.

Thanks.  I'll have to remember "young ones" next time I receive
yet another AARP invitation.  :-)

Yes, zero-client is essentially an X terminal--plus sound, remote
USB, etc.  JACK master runs on the display.  JACK slave with the
'net' backend runs on the server where the applications run.  I
can run aplay (on the server, aka JACK slave) perfectly as far as
I can tell.  However, with mplayer, at 8.9 seconds into a file,
the sound becomes akin to a motorboat, and the JACK master
reports rapid-fire XRUNs.  Firefox, probably playing flash, never
produces audio.

Regarding the error messages I see with Firefox and flash, I
mis-wrote in the original posting.  It's stdout/stderr from
Firefox where I see this:

jack_client_new: deprecated
Jack: JackClient::SetupDriverSync driver sem in flush mode
Jack: JackPosixSemaphore::Connect jack_sem.1501_default_alsa-jack.rawjackP.3061.
0
Jack: Already connected name = alsa-jack.rawjackP.3061.0
Jack: Clock source : system clock via clock_gettime
Jack: JackLibClient::Open name = alsa-jack.rawjackP.3061.0 refnum = 2
Jack: JackClient::PortRegister ref = 2 name = alsa-jack.rawjackP.3061.0:out_000 
type = 32 bit float mono audio port_index = 5
Jack: JackClient::PortRegister ref = 2 name = alsa-jack.rawjackP.3061.0:out_001 
type = 32 bit float mono audio port_index = 6
Jack: JackClient::Activate
Jack: JackClient::StartThread : period = -2147483648 computation = 21333 constra
int = 500
Jack: Create non RT thread
Jack: ThreadHandler: start
Jack: JackClient::kActivateClient name = alsa-jack.rawjackP.3061.0 ref = 2 
Jack: JackClient::Connect src =  dst = system:playback_1
Jack: JackClient::Connect src =  dst = system:playback_2
Jack: JackGraphManager::GetBuffer : port = 5 is released state
Jack: JackGraphManager::GetBuffer : port = 6 is released state
Jack: JackGraphManager::GetBuffer : port = 5 is released state
Jack: JackGraphManager::GetBuffer : port = 6 is released state
...

The last pairs of lines repeat at high speed forever.  It appears
to my untrained eye that 'src' is set to the empty string, which
would seem to be potentially significant.

At the moment, my uneducated guess is I need some "ctl" entries
in the server's .asoundrc.  Currently, it has this:

pcm.rawjack {
    type jack
    playback_ports {
        0 system:playback_1
        1 system:playback_2
    }
    capture_ports {
        0 system:capture_1
        1 system:capture_2
    }
}

pcm.jackplug {
    type plug
    slave { pcm "rawjack" }
}

pcm.!default {
    type plug
    slave { pcm "rawjack" }
}

However, that's essentially what I believe I have seen in
documentation, with no 'ctl' entries.

Suggestions?

Thanks,

Robert

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