On Fri, 2015-01-23 at 14:25 +0200, Tanu Kaskinen wrote: > On Thu, 2015-01-22 at 20:37 +0100, Martin Klein wrote: > > 2015-01-21 12:10 GMT+01:00 Tanu Kaskinen <tanu.kaskinen at linux.intel.com>: > > > On Sun, 2015-01-18 at 13:54 +0100, Martin Klein wrote: > > >> Okay, this works as expected, i.e. I hear the noise on the intended > > >> speaker. Thank you for suggesting this test. Now to summarize: In > > >> principle surround seems to work with both Alsa and Pulse (i.e. I can > > >> output sound on only the intended speaker). However, both volume > > >> controls and module-remap-sink does not work for the surround channels > > >> with pulseaudio. Any ideas on how to debug this further? > > > > > > If we still ignore the volume control problem, the next step is to > > > investigate what goes wrong with module-remap-sink. You said it doesn't > > > give any output. Check the volume and mute state of the remap sink and > > > the sink input between the remap sink and the master sink. If those are > > > ok, check that the mixing matrix looks ok (the matrix is shown in the > > > debug log of the server when you load module-remap-sink). > > > > > Checking the volume and mute state of the remap sink was the first > > thing I checked. The channel is unmuted, I toggled the mute state and > > increased the volume to the max. All to no avail. Thank you for your > > suggestion regarding the channel matrix. Unfortunately I couldn't find > > any documentation on how to interpret the channel matrix. I think I > > found the two matrices corresponding to my to remap sinks: > > http://pastebin.com/CuDjDaM4 > > I have no idea on how to interpret this. I'm a little bit confused by > > the separator line for in the first matrix. Also, the asymmetry of the > > second matrix looks weird to me (there is an empty row between the 1 > > of the second columns. > > The channel factors (the ones and zeros) seem to be correct, but the > printing is messed up. It looks like each line is duplicated in the log. > How did you create that log? > > I'll explain how to interpret the matrix. In this example I have loaded > module-null-sink with six channels, and the channel map is > front-left,front-left-of-center,front-center,front-right,front-right-of-center,rear-center. Then I play a stream with channel map front-left,front-right, with remixing disabled. The resulting matrix looks like this: > > I00 I01 > +------------ > O00 | 1.000 0.000 > O01 | 0.000 0.000 > O02 | 0.000 0.000 > O03 | 0.000 1.000 > O04 | 0.000 0.000 > O05 | 0.000 0.000 > > I00 and I01 are the input channels, and O00-O05 are the output channels. > The matrix shows that I00 goes to O00 and I01 goes to O03. Other output > channels don't have any inputs, so they get silence. > > Now, back to your setup, it remains a mystery why you don't get any > audio with module-remap-sink. The next step could be to record from both > the monitor of the alsa sink and from the monitor of the remap sink. Are > one or both of the recordings silent? FYI, on my machine module-remap-sink seems to be working fine (I don't have surround output for testing, but I created a remap sink on a stereo sink, such that the remap sink plays only to the right channel). -- Tanu
