fix PA_SAMPLE_S16NE volume scaling bug; fix video stuttering in Firefox by calling write callback as soon as minreq bytes become available in write buffer; make error messages from do_connect_pcm friendlier.
Looks like apulse is getting some attention after Firefox started requiring PA. Thanks for reporting! commit 9f80fde4a6f74ab738174bc77931b35ca9b9f28f