AFMT_VCHAN
if (!(besthwformat & AFMT_VCHAN)) {
(bestformat & AFMT_VCHAN)) {
if (pformat & AFMT_VCHAN) {
if (pformat & AFMT_VCHAN)
if (newfmt == 0 || !(newfmt & AFMT_VCHAN)) {
if (vchanfmt != 0 && !(vchanfmt & AFMT_VCHAN))
if (p->format & AFMT_VCHAN)