Re: [mpg123-devel] Notion of SEEK_END

[Thomas O. <tho...@or...>]

Am Tue, 29 Aug 2023 17:21:23 +0000
schrieb Thomas Brand <to...@tr...>: 

> To seek 10 samples before the end, I'd seek(-10, SEEK_END), but this 
> overshoots by 10 samples (length + 10). On the other hand, seek(10, 
> SEEK_END) will go to 10 samples before the end. I think this notion is 
> inverse to other uses of SEEK_END.

Oh, great. Looking at lseek(2) and at my own documentation in mpg123.h,
the behaviour indeed does not match the description. It's utterly
wrong and you are the first person to notice.

Damn. I have to think hard on how to best handle it. Just correcting
the behaviour would break anyone relying on the existing. At the same
time, precisely because you're the first one noticing, I _guess_ that
you might be the only one trying to seek from the end on MPEG files so
far.

Having the reverse meaning compared to lseek really sucks. I don't have
the solution right now for the next release, just a confirmation that
you're right.


Alrighty then,

Thomas