[pulseaudio-discuss] Intercepting PulseAudio sound for EQ display?

Josh Lehan krellan at krellan.com
Thu Oct 23 00:04:32 PDT 2008

Hello.  I have a question about intercepting PulseAudio-generated sound.

I'd like to make a display for the sound buffer that is currently 
playing in realtime, either an oscilloscope or an EQ.

Is there an API within PulseAudio to do this?

I looked at the monitor sample code for pavumeter, but it seems geared 
towards just getting the overall volume level of the current buffer, and 
not the actual sample data.

I'd love a call to "sniff" the sample data fairly late in the output 
process, after it has been mixed from all sources, just before it is 
sent to the sound hardware.  Does such a thing exist?

The next step after being able to "sniff" the data would be to modify 
the buffer and replace it, allowing for EQ adjustments and other 
filters, but just being able to see the data would be a big help for now.



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