'Twas brillig, and john owen-jones at 04/09/10 08:45 did gyre and gimble: > let me give you my situation, > I have an aspire one netbook and the internal mic is stereo but the 2 > channels are combined 180 degrees out of phase so if left and right > channels are set to similar levels there is no sound recorded. Ahhh, that explains a problem reported to me the other day: https://qa.mandriva.com/show_bug.cgi?id=55930 > The solution is to open pulse audio volume control and set one channel > to zero and the other to an appropriate level. > > A well behaved program such as skype has the option to adjust audio > settings automatically or not. (naturally not is appropriate) > google voice and video plugin doesn't have this option and sets both > audio input channels to the same level resulting in silence. Really the applications should be setting the levels of their own *stream*, not the device itself. This approach would solve the problem, but sadly we do not currently support per-stream volumes on the recording side of things, only playback. This is an asymetrical problem of PA. Really we need to resolve that. It also simplifies the client-side API too to be more symmetrical. I discussed this a while back with Lennart while helping out the Skype guys and I think he was in favour of implementing this now that flat volumes is in the system. I guess we just need someone to feel inspired and do the work :) That said doing this is just a work around for an underlying problem. If the mic is broken like this, then I guess it should be fixed at the alsa level. May be worth testing with PA suspended and recording from the mic directly. Also try to see if using the front: device vs. the hw: device actually makes any difference (I know that we use front: but this is generally discouraged for recording IIRC). If you still have problems at the alsa level, please raise this issue on the alsa-devel mailing list (I'll keep my eye out for it, but posting a reference to the alsa-devel list archive here would be nice :)) 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/]
