[alsa-devel] Backported sbxfi driver, possible fix

[Takashi Iwai]

At Mon, 27 Oct 2008 09:34:27 +0300,
The Source wrote:
> 
> Takashi Iwai пишет:
> > At Mon, 27 Oct 2008 08:32:05 +0300,
> > The Source wrote:
> >   
> >> Alexander E. Patrakov пишет:
> >>     
> >>> Takashi Iwai wrote:
> >>>   
> >>>       
> >>>> A few important features are in my mind:
> >>>> - continuous rate support
> >>>>     
> >>>>         
> >>> In the sources, you have:
> >>>
> >>>   
> >>>       
> >>>> Note: 44.1kHz is possible, but is more complex because it uses a method
> >>>> whereby the channel ring marks each sample in the channel ring as valid
> >>>> or not, so to get 44.1kHz, some samples are simply tagged invalid. The
> >>>> "channel ring" is not the ring buffer that is used to get sound samples
> >>>> to the card. The "channel ring" is used to pass samples between
> >>>> different processing modules on the card. One of these processing
> >>>> modules is the SRC, another is the INs/OUTs, another is the hardware
> >>>> mixer, and yet another is the DSP.
> >>>>     
> >>>>         
> >>> Do I understand correctly that the card internally resamples the sound 
> >>> to a different rate using the zero-order-hold method? If so, I'd rather 
> >>> not see this feature at all unless the "i_want_horrible_sound" parameter 
> >>> is passed, because software can do it better, and some program will 
> >>> surely default to using this hardware misfeature.
> >>>
> >>> OTOH, Wine is doing this for ages and nobody except me complains 
> >>> (http://bugs.winehq.org/show_bug.cgi?id=14717)
> >>>
> >>>   
> >>>       
> >> Wine causes sound corruption with this driver for me (along with some 
> >> other software like Pulseaudio).
> >>     
> >
> > Does it happen also with base_rate=48000 option?
> >   
> Yes.
> > It'd be helpful if someone can summarize the working and non-working
> > cases.  For example,
> >
> > global info:
> > 1. sbxfi driver version (date & HEADs)
> > 2. base_rate value
> > 3. system details (x86-64, distro, kernel version, etc)
> >
> >   
> 26.10.2008 snapshot, don't remember the time.

Add prefix numbers (1, 2, 3) to each item.

See HEAD files in alsa-driver*/ and alsa-driver*/alsa-kernel, and take
the first line.

> 96000 and 48000
> x86-64 Fedora 9 kernel-2.6.26.6-79.fc9.x86_64
> > for each app:
> > A. Application name / version
> > B. working or not-working, problem descriptions
> > C. ALSA or OSS (you can see it in /proc/asound/card*/pcm0/sub0/hw_params)
> > D. period_size and buffer_size (ditto, or in kernel message)
> > E. any special options
> >
> >   
> Wine 1.1.6

Add prefix to each item, too.

> Sound glitches
> Both ALSA and OSS
> Very weird values, I reported before.

Write it up again.


Takashi