add_pcm_convert
if (err = add_pcm_convert(list, ihdr, LINEAR, 2, bufs)) {
if (err = add_pcm_convert(list, ihdr, LINEAR, 2, bufs)) {
if (err = add_pcm_convert(list, ihdr, LINEAR, 2, bufs)) {
err = add_pcm_convert(list, ihdr,