AMIXER_LINEIN_C
amix_d = mixer->amixers[AMIXER_LINEIN_C*CHN_NUM];
amix_d = mixer->amixers[AMIXER_LINEIN_C*CHN_NUM+1];
case MIXER_LINEIN_C_S: return AMIXER_LINEIN_C;
case AMIXER_LINEIN: return AMIXER_LINEIN_C;