[webkit-gtk] Webkit seizes sound device

[Jeffrey Barish]

On Monday, 02 December 2013 08:16:09 Philippe Normand wrote:
> On Sun, 2013-12-01 at 14:25 -0700, Jeffrey Barish wrote:
> > On Sunday, 01 December 2013 22:06:12 Philippe Normand wrote:
> > > On 2013-12-01 17:26, Jeffrey Barish wrote:
> > > > On Sunday, 01 December 2013 16:44:22 Philippe Normand wrote:
> > > >> Which website are you trying to visit exactly?
> > > > 
> > > > Wikipedia.  The page about John Philip Sousa, for example.
> > > 
> > > So you play the audio on that page and the audio device is not released,
> > > right?
> > > That bug has been fixed in version 1.11.1. 1.8.3 is quite old, I advise
> > > you to report
> > > that issue in Ubuntu's bug tracker, perhaps someone would cherry-pick
> > > the patch:
> > > 
> > > https://bugs.webkit.org/show_bug.cgi?id=89122
> > > 
> > > Philippe
> > 
> > I don't actually play the audio, I just land on the page.  The audio
> > device
> > goes to state PREPARED.  It remains in that state until I navigate away
> > from the web page.
> 
> This is impossible (on that Wikipedia page) unless you use some weird
> NPAPI plugin...

How would I know whether I am using a weird NPAPI plugin?  I am not 
intentionally using any plugin, weird or otherwise.  I didn't even know what 
an NPAPI plugin was, until I looked it up.

I run

cat /proc/asound/card1/pcm0p/sub0/status

I get "closed".

I simply navigate to the page about Sousa.  Nothing plays.  When I repeat the 
above command, I get "PREPARED" (and some other stuff).  I wait.  Nothing 
plays.  I still get "PREPARED".  I wait some more.  Still nothing plays, still 
I get "PREPARED".  I navigate away from the page about Sousa.  I get "closed".  
You might think it's impossible, but I'm telling you what I see.

> > In the bug that you referred to, the state went to RUNNING.  The situation
> > I am encountering seems different.  Maybe it is intended that the state
> > should go to PREPARED, but the effect is that no other program can use
> > the audio device, even one that actually has something to play.  The
> > application running webkit will never actually play anything, so it would
> > be unfortunate if there weren't a way to prevent webkit from monopolizing
> > a device that it only thinks it might use.
> 
> What is the application exactly?

It's a client for a music server (similar to MPD). 

> Philippe
> 
> > > >> The webaudio setting would be useful only for websites using the
> > > >> WebAudio API... Anyway, WebAudio is not even enabled in the build yet
> > > >> so
> > > >> this setting has no effect at all.
> > > >> 
> > > >> Which version of the webkitgtk package are you using exactly?
> > > > 
> > > > dpkg says
> > > > 
> > > > libwebkitgtk-1.0-0                   1.8.3-0ubuntu0.12.04.1
> > > > 
> > > >> Can you test the latest stable release?
> > > > 
> > > > Probably beyond my abilities.  If it's available as a deb package
> > > > maybe.
> > > > 
> > > >> Philippe
> > > >> 
> > > >> On Sat, 2013-11-30 at 10:00 -0700, Jeffrey Barish wrote:
> > > >> > Apologies to those who have seen this message on the webkit mailing
> > > >> > list.
> > > >> > I erroneously subscribed to that list before understanding that I
> > > >> > should
> > > >> > have subscribed to this one.
> > > >> > 
> > > >> > When I visit a web page that wants to play a sound, webkit opens
> > > >> > the
> > > >> > sound
> > > >> > device and never lets go of it until I navigate away from the page.
> > > >> >  I
> > > >> > would like for webkit not to open the sound device (and to ignore
> > > >> > any
> > > >> > play request, obviously).  Is there a way to tell webkit globally
> > > >> > that
> > > >> > it
> > > >> > should ignore all sounds and never, ever open the sound device?
> > > >> > 
> > > >> > I am on Lubuntu 12.04.  webkit appears to be 1.0.
> > > >> > 
> > > >> > I found the enable_webaudio property in WebSettings.  It seemed as
> > > >> > if
> > > >> > it
> > > >> > would solve my problem, but it was already at its default value
> > > >> > (False).
> > > >> > 
> > > >> > I tried changing some settings in dconf-editor:
> > > >> > 
> > > >> > org | gnome | desktop | media-handling | autorun-never -> ticked
> > > >> > org | gnome | desktop | media-handling | autorun-x-content-ignore
> > > >> > ->
> > > >> > ['audio/ogg']
> > > >> > desktop | gstreamer | 0.10 | default-elements |
> > > >> > {chat,music,sounds}-audiosink -> fakesink
> > > >> > 
> > > >> > all to no avail.  Any suggestions?  My best idea at this point is
> > > >> > to
> > > >> > filter the <audio></audio> item out of the html, but I think that's
> > > >> > a
> > > >> > pretty bad idea.
> > > >> > 
> > > >> > Jeff
> > > >> > _______________________________________________
> > > >> > webkit-gtk mailing list
> > > >> > webkit-gtk at lists.webkit.org
> > > >> > https://lists.webkit.org/mailman/listinfo/webkit-gtk
> > > >> 
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