Knut-H?vard Aksnes wrote: > 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. You can see the calls in pavucontrol, which in recent versions shows a per-stream eq level... that code should be ripe for the picking! :) Col -- Colin Guthrie gmane(at)colin.guthr.ie http://colin.guthr.ie/ Day Job: Tribalogic Limited [http://www.tribalogic.net/] Open Source: Mandriva Linux Contributor [http://www.mandriva.com/] PulseAudio Hacker [http://www.pulseaudio.org/] Trac Hacker [http://trac.edgewall.org/]
