audio_format2_tostr
audio_format2_tostr(buf, sizeof(buf), src);
audio_format2_tostr(buf, sizeof(buf), dst);
static void audio_format2_tostr(char *, size_t, const audio_format2_t *);
audio_format2_tostr(fmtbuf, sizeof(fmtbuf), &pfmt);
audio_format2_tostr(fmtbuf, sizeof(fmtbuf), &rfmt);
audio_format2_tostr(fmtstr, sizeof(fmtstr), fmt);