auring_get_contig_used
srccount = auring_get_contig_used(&stage->srcbuf);
bytes1 = auring_get_contig_used(usrbuf);
if (auring_get_contig_used(track->input) == 0) {
count = auring_get_contig_used(&track->outbuf);
count = auring_get_contig_used(&mixer->hwbuf);