Re: ALSA vs. OSS

[Olaf Dabrunz]

On 20-Jan-04, Jaroslav Kysela wrote:
> On Tue, 20 Jan 2004, Olaf Dabrunz wrote:
> 
> > > We don't do this in kernel. We implemented the direct stream mixing in our 
> > > library (userspace). If your applications already uses ALSA APIs or if you 
> > > redirect the OSS ioctls to ALSA library (our aoss library), you can enjoy 
> >   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > How can this be done? Just by creating symlinks?
> 
> No. Use aoss script in our alsa-oss package.

Ah, I see.

# objdump -t /usr/lib/libaoss.so.0.0.0

/usr/lib/libaoss.so.0.0.0:     file format elf32-i386

SYMBOL TABLE:
[...]
000062a0 g     F .text	00000088              ioctl
[...]
00006490 g     F .text	0000008f              munmap
[...]
00006bc0 g     F .text	00000857              select
[...]
000063c0 g     F .text	000000cf              mmap
[...]
00006180 g     F .text	00000088              write
[...]
00006210 g     F .text	00000088              read
[...]
00006890 g     F .text	00000325              poll
[...]
00005fd0 g     F .text	000000da              open
[...]
00006330 g     F .text	00000088              fcntl
[...]
000060b0 g     F .text	000000c9              close
[...]

So libaoss.so is a wrapper for all file-related system-calls, I suppose
to catch calls involving /dev/dsp and /dev/audio.

-- 
Olaf Dabrunz (od / odabrunz), SUSE Linux AG, Nürnberg

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