AMIXER_SPDIFO
amix_d = mixer->amixers[AMIXER_SPDIFO*CHN_NUM];
amix_d = mixer->amixers[AMIXER_SPDIFO*CHN_NUM+1];
case MIX_SPDIF_OUT: return AMIXER_SPDIFO;
case MIXER_SPDIFO_P: return AMIXER_SPDIFO;