Subject: Re: [ecasound] edi-18: removal of implicit resampling
From: S. Massy (theanaloguekid_AT_tak.net.dhis.org)
Date: Wed Jan 30 2002 - 03:52:17 EET
In short, I think it's a damn good idea. :)
But maybe there are some users who actually find this resampling thing
useful. Personally I use sox whenever I want to resample something and
the whole -sr variation thing is just a pain to me.
On Wed, 30 Jan 2002, Kai Vehmanen <kai.vehmanen_AT_wakkanet.fi> wrote:
> Just came up with a solution candidate for...
>
> (edi-18) Intelligent system for setting the internal sample rate.
>
> What if we just removed implicit resampling altogether? My reasoning
> behind this is:
>
> - current resampling is not high-quality (mostly just causes
> bad pr for ecasound)
> - for any kind of realtime work, resampling should _not_
> be used (wastes cpu-resource for no good reason)
> - only real use for resampling is file format conversions
> - by removing the "resampling_needed()" check we
> make the common code path a little bit faster (although
> not much) and cleaner
> - we avoid problems with unexpected resampling
>
> As a result you could not execute a chainsetup, where sampling rate of
> one or more objects differs from engine's sampling rate.
>
> If this was done, implementation of 'edi-18' would be reduced to:
>
> - find the common sampling rate between audio objects
> - if found: set engine's rate to it
> - else: print an error message
>
> This would also make the -sr option obsolete.
>
> For cases where resampling is needed, a new audio object type could be
> added - something like:
>
> ecasound -f:16,2,44100 -i resample,22050hz_file.wav,44100 -o output.wav
>
> As a bonus, as now resampling would be a special-case operation, we are
> not limited to light resampling algorithms. In practise we could use a
> much more high-quality (=cpu-heavy) alternative (if someone has the time
> to do it).
>
> Comments?
>
> --
> http://www.eca.cx
> Audio software for Linux!
>
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