> What I know from the manual is that the device can do > > either 4X4 (2 stereo in and 2 stereo out) in 16-Bit mode up to 48kHz > or 4x2 2 stereo in and 1 stero out in 24-Bit mode up to 48kHz > or 2X4 1 stereo in and 2 stereo out in 24-Bit mode up to 48kHz Same thing for Audiophile USB. > some more limitations are present when using higher sampling rates up > to 96kHz > thus I belive that normally in 24-Bit mode the alternate settings 3 > and 6 should not > be used. At least I had no output witch setting 3 and I had an output > with setting 2. I had to find out which mapping is used for my device as well. I used usb sniff under windows and played with the M-Audio control panel... My conclusions are described in Documentation/Audiophile-Usb.txt which can give you ideas about how M-Audio implements usb interfaces. > > Do you know which calls are necessary to switch the config of a usb device? In my case I use a device_setup parameter at the module initialization, because it seems that switching from AltSettings corresponding to 16bits endpoints to AltSettings corresponding to 24bits endpoints causes allignment errors. > I have to investigate this further. It can not be a general problem > because the 16-Bit mode is working. But it can be that the alignment > of 24-Bit is different. Yes looks like it is.... you can have a look at the patch I proposed, you may find interresting info: http://hg-mirror.alsa-project.org/alsa-kernel?cmd=changeset;node=4249e5ffdb3f;style=gitweb Regards, Thibault ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
