[paranoia] Popping errors patch

[Monty]

On Thu, Jun 28, 2001 at 04:46:57PM -0600, Jason wrote:
> 
> Several ATAPI CDROM drives I've tried produce popping noises in the .wav
> files they create.  I'm not sure exactly why, and I haven't checked
> whether
> they're always in the exact same place coming from different drives.
> 
> Looking at the waveforms, though, it looks like they're usually single
> data points (samples) which have apparently random values - there'll be 
> a nice quiet waveform and then a single sample that's many times
> stronger right in the middle.  So I'm assuming they represent scratches
> or somesuch thing.

Possible.  or our cache defeating algorithm isn't always suceeding on
a drive that makes mistakes (and caches them).

> Anyway, the anomalies I've been seeing are pretty obvious, and I think I
> can use average deltas or magnitudes to detect them and replace them
> with interpolated values.  So it won't be perfect, but at least it
> shouldn't be noticeable.  I'll post patches here if anybody cares and I
> can get it to work well.

I'll provide a link to a patch.  For single samples, interpolation
works well; later versions of Paranoia (eventually, eventually) will
have built in general purpose interpolation algorithms, but that's a
ways off.

Monty

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