telesistant at hotmail.com
Tue Jul 16 13:46:10 EDT 2013
Finally, I think we have managed to "close the chapter" in the miserable
quest for accurate information to allow for proper compilation of the
USB-related audio channel drivers, regarding the "proc/sys file structure"
of various Linux kernels, etc.
As it turns out, the "major" change in that area happened in Linux Kernel
2.6.20, as the new release of ALSA at that time (1.0.19) did some changes in
that area. In addition, to allow for "backwards compatibility", a new kernel
parameter (CONFIG_SYSFS_DEPRECATED) was added to allow for "newer"
kernels to use the "old structure" for the /sys filesystem entries.
So, all of the Centos 5.X kernels, are 2.6.18-based, and are pre-changes.
Limey Linux, which is a 2.6.30 kernel, has the CONFIG_SYSFS_DEPRECATED
parameter enabled, so it "acts" like a pre 2.6.20 kernel in that repsect also.
Pickle, is a 2.6.35 (as I recall), and follows the "current" way of doing things.
Now, the build scripts and sources (in SVN) take all this into account, and seem
to properly build in all the OS's that we support.
Since this is (hopefully) *FINALLY* done, it would be nice to "move on" to the
next UTTERLY MISERABLE festering technical issue with app_rpt: The fact that
the OSS audio support in the newer kernels (like the one used in Centos 6.X)
seems to be SERIOUSLY broken.
It is entirely possible that if chan_simpleusb and chan_usbradio were modified
to use ALSA directly, instead of using the OSS compatibility layer (as it does now),
it *MIGHT* fix this problem (and might also allow newer ARM implementations,
such as the Pi, etc) to work properly, at least with chan_simpleusb.
This is not, by any means, a simple task. Nor does it even guarantee that it will
do any good. We don't *KNOW* that this is problem. It just seems like a reasonable
guess at this point.
Is there anyone out there that is capable and willing to attempt to port (particularly
chan_simpleusb at first) to "native ALSA"?? It sure would be nice. I am EXTREMELY BUSY
and just can't do everything here (technically).
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