Josh Lehan wrote:
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?
Sure: Use the monitor interfaces. Each sink has associated with it a
monitor source interface where you can listen to the stream being sent.
To find it just add .monitor to the name of the source interface. The
asynchronous API have calls to do this and lots of other useful tasks.
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