[App_rpt-users] Finally....

Bob Tenty bobtenty at gmail.com
Wed Jul 17 02:07:54 EDT 2013


Regarding OSS in linux

In the kernels of Ubuntu 12 .04 and later OSS support (OSS to ALSA emulation
is switched off (depreciated) and is or will happen with more distro's
What you can do is to install OSS4 (oss4-base & oss4-dkms ), with
oss4-dkms new
oss modules will be compiled and installed from source in the background
every-time
a new kernel will be installed. OSS4 uses new name modules and devices but
will also create soft-links with the old legacy devices /dev/dsp &
/dev/mixer to the
new oss4 devices.
I installed the libasound2 library and pulseaudio and did set the config
file of
libasound2 to use pulseaudio and  pulseaudio to output OSS
Now we can use programs that interface with  both ALSA and OSS.

It is also possible to not install pulse audio and only OSS4 and libasound2
and also to use  OSS and ALSA talking programs (this need a different
libasound2 config.)
Something along the same line is valid for other distro's.

73,

Bob / Boudewijn VE3TOK


On 13-07-16 01:46 PM, Jim Duuuude wrote:
> 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).
>
> Jim WB6NIL
>
>
>
>
>
>
>
>
>
>
>
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