[linux-audio-dev] cdparanoia fails / audiofile comparer

[Juhana Sadeharju]

Hello.
Anyone would like to develop cdparanoia further?

I ripped a CD two times with the following results:
 (== PROGRESS == [                      !-------| 159332 00 ] == :^D * ==)   
 (== PROGRESS == [               +      + +     | 159332 00 ] == :^D * ==)   

The errors are explaned this way:
   -    Jitter correction required
   +    Unreported loss of streaming/other error in read
   !    Errors are getting through stage 1 but corrected in stage2

Which error is more severe: "+" or "!"?
Is "+" corrected properly?

The problem is that the channels of other ripping are swapped at the
point where "!" is located (but "!" may not have caused it). I don't
know which one of the rippings is incorrect (they both could be
incorrect). The channels also have one sample offset after the
swap.

The second ripping has "+" before the "!" point, but both rippings
are indentical up to the "!" point. Would that mean that "+" is
a harmless error and that thus the second ripping is correct? And
that we should rewrite only the algorithm handling the "!" errors?

In addition to rewriting "!" handling (or "+" handling if that caused
the channel swap), I would like get out a printed list of errors.
The error list could then be used in an audio editor for marking
the errors with red color (say).

Also an audiofile comparer program would be great to have: a program
which finds matching regions. Now it was easy to compare the regions
up to the "!" point with md5sum program, but it was difficult to compare
the end part due misaligning. I compared them visually at a few random
points. In such a comparer program each matching sample would match
bitwise for this application, but they could match with an error tolerance
if the application is to compare an original audio and an edited audio
which is affected by dither noise (say). So, such a comparer would
reveal what edits were done in an audio editor -- I have needed such
a program a few times earlier.

Regards,
Juhana