[alsa-devel] Backported sbxfi driver, possible fix

[The Source]

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.
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
Sound glitches
Both ALSA and OSS
Very weird values, I reported before.
> Maybe also nice on Wiki...
>
>
> thanks,
>
> Takashi
>
>