[pulseaudio-discuss] No volume control for audio from java applet in browser

Andrew Skretvedt andrew.skretvedt at gmail.com
Tue Jun 25 01:58:45 PDT 2013

Hello list, I have a playback volume control question:
I'm running Crunchbang Linux, Firefox 21, and icedtea for Java...

I like to listen to WebSDR sites, which mostly use java applets for
their audio delivery. These play fine in my browser, but I get no
volume slider in pavucontrol's playback tab. So, the only control over
the volume of the java audio coming at me is by the slider for my
output device under that tab, which is suboptimal as it's controlling
volume of all audio globally on my machine. What I'd like is to just
be able to adjust the volume coming from the java applet, which
doesn't always provide its own volume control in the browser for users
of the WebSDR receiver to twiddle.

Anyone know why the java applet's audio output is not causing a volume
slider to appear in the playback tab? Other applications (all that
I've ever used, anyway: vlc, deadbeef, etc.) do cause sliders to pop
on as soon as they start emitting audio.

I checked /etc/java-6-openjdk/sound.properties, and I see that it's
setup to use org.classpath.icedtea.pulseaudio.PulseAudioMixerProvider.

So, it would appear my icedtea setup is configured to use
pulseaudio...but, no volume control for it.

Any ideas?

Thanks... next I will be exploring the possibility of using pulseaudio
on my Windows Vista box as a way of making up for the lack of a Stereo
Mix record output by the audio hardware's driver there (one of these
software-defined low-cost integrated SB Audigy devices...Creative
abandoned development for it just after Vista released and couldn't be
bothered to fully support it). I've been using a commercial product
called Virtual Audio Cable, which works well enough, but has some
shortcomings I'd like to get away from, like cronic buffer
under/overflow problems that glitch any audio flowing thru.


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