'Twas brillig, and Tanu Kaskinen at 13/05/11 16:55 did gyre and gimble: > On Fri, 2011-05-13 at 14:14 +0200, marcin at saepia.net wrote: >> Why should I prevent remixing? Can't I just use module-loopback with >> channel_map set? > > I think this is what happens (I haven't tested): if you have non-aux > channels on the sound card, let's say front-left, front-right, rear-left > and rear-right, and you try to loop back just rear-left and rear-right, > the resampler (which really takes care of more conversion than just > sample rate) will try to be smart and mix some of front-left and > front-right into the rear-left and rear-right channels. The same logic > is involved always when a stream - be it capture or playback - is > connected to a device that doesn't have the same parameters as the > stream. Configuring the device to use aux channels should disable the > "intelligent" remixing - only the channels specified by the stream will > be taken from the source. FWIW, some modules, like module-remap-sink take a remix=yes|no argument to control this behaviour even when using standard channel names. Col -- Colin Guthrie gmane(at)colin.guthr.ie http://colin.guthr.ie/ Day Job: Tribalogic Limited [http://www.tribalogic.net/] Open Source: Mageia Contributor [http://www.mageia.org/] PulseAudio Hacker [http://www.pulseaudio.org/] Trac Hacker [http://trac.edgewall.org/]
