'Twas brillig, and 4ernov at 01/07/10 15:58 did gyre and gimble: > Hello, > I'm working at some global effect processing stuff, for example, > equalizer which affects several my applications which output sound > through Pulseaudio. I want to implement it using GStreamer and virtual > soundcard which all the applications will output their sound to. E.g. > we set some virtual PA device as output for every application, say > "devproc" and some processing GStreamer application use this device as > its input and transfers stream to 'real' PA device (which stands for > real soundcard) through some effects. > > My question is: is it possible to create a virtual device in > Pulseaudio which has one input and one output and transfers stream > from its input to the output? I tried different solutions including > module-loopback (no success) and module-pipe-sink/source (gstreamer > wasn't able to stream through it due to very low speed as I guess) but > I have no success at all. While I don't know much about it, git master does have a kind of virtual device that is used for the new built in equaliser stuff. It may be that you could use that. Alternatively you could simply use a null sink (call it what you want, play your stuff to the null sink, then have a gst pipeline that records from the monitor source of that sink, does it's processing and then plays it back to a real sink. That should work OK if you can live with all the delays and inefficiences etc. such an approach creates. 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/]
