> > > Actually, I think I found the problem. I was using the maximum number > > > of playback and captures channels reported by the device. For > > > "plughw", this number is apparently 10000, rather than the actual > > > number the hardware supports! I guess what I have to do is open the > > > "hw" device first to get the actual number of channels, then open > > > "plughw" with that number of channels. > > > > That would work in the "default" alsa configuration. It does not work in > > the generic case as the hw and plughw default devices might be pointing to > > completely different hardware (for example "hw" might be pointing to the > > second card in a system, a 24 channel Hammerfall, and "plughw" might point > > to the first card, a stereo Ensoniq 64 :-) > > I *do* need to know the physical number of channels, since I > have a little mutitrack recording app, and a GUI that lets the user > select a source channel for each track. It would be a bit silly to > have to ask the user how many channels there are before putting up the > GUI. Anyway, it sounds like I should just use the "hw" device and > forego the plugins.
That's what I ended up doing for the alsa support in snd. There are a couple of workarounds that can be programmed in the asoundrc file to enable a plug pcm to not use the channel mixing conversion (don't remember exactly how now, look in the archives) but it is not something you can control from your code. -- Fernando _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
