FWDV_STATE_STREAMING
if (sc->dma_ch >= 0 || sc->state == FWDV_STATE_STREAMING) {
sc->state = FWDV_STATE_STREAMING;
sc->state != FWDV_STATE_STREAMING) {
if (sc->state == FWDV_STATE_STREAMING) {
if (sc->state != FWDV_STATE_STREAMING) {
if (sc->state != FWDV_STATE_STREAMING) {