AMIXER_SPDIFI
amix_d = mixer->amixers[AMIXER_SPDIFI*CHN_NUM];
amix_d = mixer->amixers[AMIXER_SPDIFI*CHN_NUM+1];
case MIX_SPDIF_IN: return AMIXER_SPDIFI;
case MIXER_SPDIFI_P: return AMIXER_SPDIFI;
case AMIXER_SPDIFI: return AMIXER_SPDIFI_C;