View source for Dsp

Sometimes you will have two applications trying to access your audio device. Here is an example screenshot of a user trying to run xmms, when something else is accessing the audio:


[[Image:dsp.jpg|error screenshot]] 


The culprit can be discovered with lsof assuming your audio device is /dev/dsp like it is on BSD:

 $ lsof | grep dsp
 firefox-b 14905 frank    1w  VCHR       30,3        0t0     38 /dev/dsp0.0
 firefox-b 14905 frank    1w  VCHR       30,3        0t0     38 /dev/dsp0.0
 firefox-b 14905 frank    1w  VCHR       30,3        0t0     38 /dev/dsp0.0
 firefox-b 14905 frank    1w  VCHR       30,3        0t0     38 /dev/dsp0.0

as you can see, one of the websites I am viewing with firefox has claimed access to my dsp first. I must now close that tab in firefox, and restart xmms, and all is well.


== Stop embedded audio in Firefox ==

 vi ~/.mozilla/firefox/[[variables|0wt4rci4.default]]/chrome/userContent.css

and add these lines (creating the file if it doesn't already exist)

 /* block embedded sounds */
 embed[src*=.mid] { display: none !important }
 embed[src*=.mp2] { display: none !important }
 embed[src*=.mp3] { display: none !important }
 embed[src*=.mp4] { display: none !important }
 embed[src*=.wav] { display: none !important }
 embed[src*=.wma] { display: none !important }

== Stop embedded audio in flash ==

Not a highly recommended hack, but I opened 

 vi ~/.mozilla/plugins/libflashplayer.so

and did a 

 /dsp

replacing /dev/dsp with /dev/xxx in order to stop flash from accessing my /dev/dsp, as it never released it properly.