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