Re: [Openvortex-dev] Alsa-XMMS buffer time weirdness / Quad codec

[Stanislav Kogan]

Hello.

On 05 Jul 2003 21:30:59 -0400
"Manuel Jander" <address@hidden> wrote:

> Hi,
> 
> I guessed there would be some programs having trouble, but not that
> much. THe problem is that there are some combinations of period size
> that are not supported by the Aureal Vortex causing "clicks".
> But it semes that the restriction for the the period size is to picky.
> I'll try to fix that soon.

I have a nasty suspicion that this may be related to the stereo swapping
problem. The clicks that we get when we change the buffer to below 63KB
sound very much like stereo swaps.



> 
> By the way, on ADB address 0x8c and 0x8d i was able to playback audio
> through the "surround" dac (STAC9708 codec). Thats means that quad
> playback is possible. But i was unable to set the codec in quad mode
> to playback a normal stereo stream through 4 speaker. The STAC9708
> datasheet states that this is possible setting a certain bit.
> 
> Best Regards
> 
> On Sat, 2003-07-05 at 15:30, Stanislav Kogan wrote:
> > Hello.
> > 
> > On Sat, 5 Jul 2003 18:56:18 +0300 (EEST)
> > "Taisto Kuikka" <address@hidden> wrote:
> > 
> > > > So, what's so special about 371ms?
> > > 
> > > Just guessing but 65536 bytes ~ 371.5 ms 44100 Hz 16 bits stereo
> > > samples
> > 
> > Indeed. One thing, though: One would expect it to panic with 341ms
> > buffer when playing a 48Khz file. Surprisingly - it doesn't. 341ms
> > is the highest buffer which gives distorted output, though.
> > 
> > Now, isn't 64KB the maximum size of the period?
> 
> No. The max period size is 4096 bytes. There are max 64 periods.
> 
> 
> 
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-- 

Stanislav Kogan
<*>
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