ALSA and Wine DirectSound question: Fwd from wine-patches list

ALSA and Wine DirectSound question: Fwd from wine-patches list

[Chris Rankin]

I think the Wine developers are seeking enlightenment from an ALSA Guru. (The "World of Warcraft"
people seem keen to get this patch working, too ;-).) Can anyone help, please?

http://www.winehq.org/hypermail/wine-patches/2005/08/0173.html

Cheers,
Chris



	
	
		
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Re: ALSA and Wine DirectSound question: Fwd from wine-patches list

[Lee Revell]

On Wed, 2005-08-10 at 13:14 +0100, Chris Rankin wrote:
> I think the Wine developers are seeking enlightenment from an ALSA Guru. (The "World of Warcraft"
> people seem keen to get this patch working, too ;-).) Can anyone help, please?
> 
> http://www.winehq.org/hypermail/wine-patches/2005/08/0173.html

This sounds a lot like my theory about what is causing the infamous
crackling problem that has been reported with JACK - the ALSA middle
layer is consistently returning an incorrect hardware pointer which
causes a few samples from the other buffer (assuming a double buffering
scheme) to be overwritten.

Lee



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Re: ALSA and Wine DirectSound question: Fwd from wine-patches list

[Takashi Iwai]

At Wed, 10 Aug 2005 15:08:45 -0400,
Lee Revell wrote:
> 
> On Wed, 2005-08-10 at 13:14 +0100, Chris Rankin wrote:
> > I think the Wine developers are seeking enlightenment from an ALSA Guru. (The "World of Warcraft"
> > people seem keen to get this patch working, too ;-).) Can anyone help, please?
> > 
> > http://www.winehq.org/hypermail/wine-patches/2005/08/0173.html
> 
> This sounds a lot like my theory about what is causing the infamous
> crackling problem that has been reported with JACK - the ALSA middle
> layer is consistently returning an incorrect hardware pointer which
> causes a few samples from the other buffer (assuming a double buffering
> scheme) to be overwritten.

If the cracking problem doesn't happen with _snd_pcm_mmap_hw_ptr() and
happens only with this patch, the problem might be the inaccurate DMA
position triggered snd_pcm_hw_sync(). 

Maybe it'd be helpful to put debug outputs comapring both the values
of _snd_pcm_mmap_hw_ptr() and the emulated hwptr.
(You should check the values of _snd_pcm_mmap_hw_ptr() before and
 after snd_pcm_hwsync(), too).

Or, if the problem is with dmix, it's another story...


Takashi


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