Re: [Gap-dev-discuss] Cynthiune : MP3 bundle and long delays

[Riccardo Mottola]

Hi,

On 2012-05-20 20:45:23 +0200 Philippe Roussel <address@hidden> 
wrote:

> Hi,
>
> I got the MP3 bundle to seek very fast but I would like you guys to 
> try
> to understand the code because I'm missing something.
>
> To suppress the long delay while seeking through a mp3, the following 
> is
> enough :

Sadly, I had no time to look further at the code (and perhaps we 
should delay real rewrites after a  first maintenance release).
You essentially resize a buffer. I tried on my iBook (linux/G3) and 
PowerBook (10.4/G4) and found out that 2 * 8192 is a pretty decent 
compromise value. I got both machines to "crackle" when putting on 
heavy load, where load is more disk IO / swapping bound than CPU 
bound. While it is pretty easy to overload the trusty ibook with its 
limited RAM (160MB) it was a bit more difficult with the PB. iTunes on 
the same machines really rarely skips. Thus there is surely place for 
optimization.

The buffer management could also explain the dirty noise that 
(sometimes) happens when seeking in a song or when skipping to the 
next song. There might be garbage under some conditions.

I'd set the valoue from 5times to 2times, what do you think? 
Preferences could be added. But perhaps understanding the code better 
could improve it more and remove noises.

Thanks for the good work Philippe.

Riccardo