[EMAIL PROTECTED] kirjoitti: > Hi all, > > I'm currently hacking around in kmix to add at least basic OSS4 support. I've > got an usb device with a output.vol control with a value range of 0 - 37. I > of course get values much higher than that when reading from the mixer > device. The documentation is correct. Values returned by the mixer should never be higher than the maximum value.
However there appears to be a bug in the USB driver or in the device you have. For some reason the maximum value is not correvt. > The normal procedure as shown in the doc and in the ossmix source is > to clamp (is that the right word?) with a bitmask. > It is actually not "clamping". Many mixer control types return the values for both channels in a single integer. For this reason the application needs to extract the correct bits. > According to the documentation the value is a 31 bit positive integer, > therefore the bitmask should be 0xFFFFFFFE - but that would be wrong, because > I'd get values of about 9k, whereas I need 0 - 37, which I get when using the > bitmask 0xFF and AND the value with it. > What's wrong here, me or the documentation? > There is no particular reason to use any bit mask for MIXT_SLIDER since the whole integer is used for the value. If you use a bit mask then it should be 0x7FFFFFFF instead of 0xFFFFFFFE. Best regards, Hannu _______________________________________________ oss-devel mailing list oss-devel@mailman.opensound.com http://mailman.opensound.com/mailman/listinfo/oss-devel
