On Mon, 2006-06-19 at 13:04 -0400, Chris Fisichella wrote: > >On Mon, 2006-06-19 at 12:33 -0400, Chris Fisichella wrote: > >> We have a radio station. We use ALSA to bring in a balanced, stereo > >> audio signal to ICES. Unfortunately, that stereo signal is reduced to > >> mono. That is what we are broadcasting. We can't figure out for the > >> life of us what is happening, so I have been digging around the > >> various software components to determine the problem. Right now, > >> things seem to be pointing to alsaplayer. I do not know it well > >> enough to be sure, however. > >> > >> Is there a way to tell ALSA not to do that? > >> > > > >I don't think your problem is related to the automatic mono->stereo > >upmixing that the default device does. ALSA does not discard data like > >that. > > > >Does "arecord -f cd file.wav" record a mono or stereo signal? > > > >What about "arecord -f cd | aplay"? > > > >Lee > > Okay, I think this question I asked may be a bit premature. I am > really trying to get an Echo Mia card working, but I have a > SoundBlaster card to work with. I have not gotten the audio in to > work yet on this SB card. I noticed a post on the devel list that > this functionality was recently incorporated. I did not know exactly > what revision of the driver it is included in, however. Is it in the > HG tree? Which, is very timely, given your most recent request for a > newbie HG doc. (I'll certainly use it.) > > So, I guess my first question is: Would this revision of the ALSA > driver include the ca1060 (I think that is what it is called) driver > that can handle sound input? >
Yes, the Hg version would be better for this card. 1.0.11 should support sound input, but I believe gain control is only available in the Hg version. > I tried those commands, they recorded something. (Most likely digital > silence.) They did say they were in stereo. I guess I need to get a > hold of a stereo .wav file in the interim. There is a little short > one in the /usr/share/sounds directory that I thought was also > displaying this behavior. > > Get my sound card working? What do you think? All I really need to do > is figure out why our signal is going to mono. Um, I don't know what you are asking here. I am trying to establish whether the problem is in ALSA or in your app. If you connect a stereo input source and run "arecord -f cd file.wav" and the resulting file is stereo, the problem is not with ALSA but with one of your apps. Lee _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
