Re: A suggestion for better resamplers in alsa.

[Takashi Iwai <tiwai@suse.de>]

At Mon, 4 Apr 2005 17:49:27 +0200 (METDST),
Clemens Ladisch wrote:
> 
> Takashi Iwai wrote:
> > ...
> > IMO, the only "perfect" solution is to change API to allow variable
> > period sizes.  Otherwise the size mismatch always occurs regardless
> > what trick you apply.
> 
> This is yet another case of a constant-period-size device, like USB or
> ymfpci.
> 
> > However, the variable period size would introduce the significant
> > changes to the core part.
> 
> Maybe we could generalize what usb-usx2y's hwdep does.
> 
> > For example, currently the hw/appl pointers are accumulated until
> > the boundary near to INT_MAX.  The real DMA buffer position in the
> > ringbuffer is calculated as 'hwptr % buffer_size'.  With the
> > variable period size, it's no longer true.
> 
> But buffer_size would remain constant, wouldn't it?

I don't think so (in the above, I suppose the input-hwptr on rate
plugin, not the output-hwptr on the real hardware).


Takashi


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