ENVY24HT_SAMPLE_NUM
ch->size = 8 * ENVY24HT_SAMPLE_NUM;
ch->size = ch->unit * ENVY24HT_SAMPLE_NUM;
sc->psize = ENVY24HT_PLAY_BUFUNIT * ENVY24HT_SAMPLE_NUM;
sc->rsize = ENVY24HT_REC_BUFUNIT * ENVY24HT_SAMPLE_NUM;