PLAYBACK_IDLE
if (ch->playback_state != PLAYBACK_IDLE) {
if (ch->playback_state != PLAYBACK_IDLE) {
ch->playback_state = PLAYBACK_IDLE;
if (ch->playback_state == PLAYBACK_IDLE)
ch->playback_state = PLAYBACK_IDLE;
(ch->playback_state == PLAYBACK_IDLE)) {
if (ch->playback_state == PLAYBACK_IDLE)