'Twas brillig, and Alex Karpinski at 13/07/10 19:32 did gyre and gimble: > On Jul 13, 2010, at 2:12 PM, Colin Guthrie wrote: > >> 'Twas brillig, and Alex Karpinski at 13/07/10 18:53 did gyre and >> gimble: >>> Long question short: Is it possible the volume for an individual >>> channel on an individual sink-input? >> >> Yes. Just use pavucontrol and make sure you press the button that >> allows individual channel volume control. > > Thanks for the advice. I guess I should have added to the short > version a little more. I need a way to incorporate this into a > script. Seeing pavucontrol was what made me think pulse would work so > well for this, I just figured that there was some other way of doing > what it does, or at least a library, but I haven't been able to find > a python library or command-line tool that won't simply lump both > channels into one. Yeah, the closest you can get is pactl: pactl [options] set-sink-input-volume SINKINPUT VOLUME But as you say this just lumps it into one volume, not per-channel volumes. Not sure on the status of python volumes, but git master now has a dbus based protocol, and while I've not looked at it, I'd imagine it supports per-channel volume control. With this in mind, it *may* be possible to write a script based on dbus-send that would work, but I have to stress that I've not looked at this at all. If you don't have any luck here, it shouldn't be too hard to adapt pactl to accept a comma separated list of volumes instead and/or write your own simple client app in C. For a simpler approach, if you have amixer, perhaps you can use that to set the independent volumes via alsa->pulse bridge that is likely in place. This will only work for full sinks, rather than a sink input, but perhaps you can use a redundant remap-sink for that purpose and only use that sink for the streams you want to change? You may need to set the PULSE_SINK variable. This is a pretty hick solution tho' :s 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/]
