Recommendation from Lennart Poettering: In ALSA_OpenAudio(): instead of setting period_size+n_periods OR buffer_size I'd recommend copying the hwparams stuff before you do this, then first try period_size+n_periods, and then apply it with snd_pcm_hw_params() and check if that works. If it didn't you should take the copy of hwparams and try setting buffer_size and apply that via snd_pcm_hw_params() and check if that worked. And if that failed too, then take the copy and don't apply neither period nor buffer settings and see if that works.

The AmigaOS code has been removed from SDL, since it had been broken for a
 long time and had a few bits of fairly invasive code #ifdef'd into the
 SDL core.

However, there is an OS4 version of SDL here:
   http://www.rcdrummond.net/amiga/index.html

And a MorphOS version here:
   http://www.lehtoranta.net/powersdl/

--ryan.