snd_afmt2str
uint32_t snd_afmt2str(uint32_t, char *, size_t);
if (snd_afmt2str(*vchanformat, fmtstr, sizeof(fmtstr)) != *vchanformat)
snd_afmt2str(f->desc.in, buf, sizeof(buf));
snd_afmt2str(f->desc.out, buf, sizeof(buf));
snd_afmt2str(f->desc.out, buf, sizeof(buf));