The new backend supports 3 quality levels: mq, hq and vhq; 16-bit integer and 32-bit float samples. Discussion and quality assessment are here:
http://comments.gmane.org/gmane.comp.audio.pulseaudio.general/22158
1335dcf Added libsoxr resampler backend.
src/pulsecore/resampler/soxr.c | 167 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 167 insertions(+)
Upstream: cgit.freedesktop.org