Open Sound System

Greetings everybody,

I recently started hacking away at cuckoo in an attempt to make it at least work. I'll probably keep messing with it in the future, but decided to drop here some small fixes that instead of making my kernel oops, at least allow to test the sound with aplay. Relevant patches are cuckoo.h.patch.txt (from this thread) and cuckoo_pcm.h.patch.txt. cuckoo is, of course, still nowhere near fixed (as in, my vlc hangs when attempting to use the virtual card), but it's a start.

As for installation, the tar of ALSA shipped with the latest stable release appears to be useless on newer kernels - it caused mine to oops. It seems, though, that the ALSA from newer kernels (3.12.6 here) "just works". To install the module you need to compile ALSA as a module, selecting at least one driver so that the kernel flag SND_PCM is set, blacklist that driver, and then compile and install cuckoo as usual.

Oddities:

- For some reason "cuckoo" module appears in lsmod with quote marks, and rmmod needs to include them. I'd love to see if it isn't just my problem.
- edit - updated the dma buffer fix, it is probably done the right way now.

I'm planning to spend some time understanding and hacking cuckoo, and will probably put any subsequent patches in this thread. If you've got any resources (links to documentation etc.), that'd be great. Also, feel free to test it - carefully.

Update - fixed broken frame format detection. Collective patch (from unmodified cuckoo) in attachments.

Also, is the oss devel mailing list still active? The links on the main site appear to be broken.

Nice to see someone is working on it - when I tried testing it once, I recall having the quote issue too.. (and it wasn't too useful either). Current mailing list is at the sourceforge project. Can't recall any docs on cuckoo.

I'd really like to see Cuckoo working as well. Thanks for this!

I tried this patch and this is what I get:





Since I am running kernel 3.12, would the patch need updated for that?

https://raw.github.com/l29ah/booboo/mas ... 3.12.patch

I had a similar issue when first trying to compile it. My first guess would be that you don't have ALSA in your kernel. Check if you have the 'sound' directory in /usr/modules/`uname -r`/kernel/, whether you compiled the kernel with ALSA, and whether the flag SND_PCM was actually set - this may require picking one of the drivers. Warnings about "undefined symbols" probably won't disappear, but otherwise shouldn't cause trouble.

No idea whether this patch could be useful (I'm a newbie to kernel stuff), I'll leave it to sb else.