[Ffmpeg-devel] alsa input / output

Vladimir Mosgalin mosgalin
Wed Mar 21 09:22:59 CET 2007

Hi Rich Felker!

 On 2007.03.20 at 21:38:17 -0500, Rich Felker wrote next:

> > 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.

True. But 1) there is no sound server as advanced as alsa and
2) sound server means library interface. Since most users need
some of these features, it means that end-user applications should
always use library interfaces and never devices (otherwise they are
broken and don't fit into the system).



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