[Ffmpeg-devel] alsa input / output

Rich Felker dalias
Wed Mar 21 03:38:17 CET 2007

On Wed, Mar 21, 2007 at 01:15:51AM +0300, Vladimir Mosgalin wrote:
> Hi Rich Felker!
>  On 2007.03.20 at 16:18:19 -0500, Rich Felker wrote next:
> Well.. sorry for OT but I really think that your point on this is VERY
> wrong.
> > Of couse, as an aside I strongly question the usefulness of lots of
> > this "functionality". It seems more like bloat to me. If the hardware
> > doesn't support a particular samplerate it should simply require the
> > application to provide a supported samplerate, rather than doing
> > horribly-painful-to-listen-to nearest-neighbor resampling in the
> > library level...
> That's exactly the problem you get with device interface; it is just
> supposed to "work". But with alsa accessed through library interface,
> you can do anything you desire, when your applications doesn't support
> this. And you mean application should _always_ use built-in
> resamplers? THAT is the right way to get painful-to-listen-to sound,
> because most of resamplers will suck. With alsa, however, you just
> choose whatever you want, depending on your CPU and personal choice
> (believe it or not, but SRC_SINC_FASTEST sounds better than
> SRC_SINC_BEST_QUALITY and all other SRC_SINC libsamplerate filters to
> me).
> Want to make pseudo-surround 5.1 out of stereo music? easily! Just want
> [......]

This does not belong at that layer.... If you want this, use a sound
server. That way it's portable and doesn't break the symbol namespace
of the app playing sound. Unix does things the unix way for very good
reasons. ALSA breaks all of that.


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