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///初始化数字音量 struct audio_stream_entry *dvol_entry; if (effect-parm.effect_config BIT(MIC_EFFECT_CONFIG_DVOL)) { effect_dvol_default_parm.ch_total ch_num;#if defined(SYS_DIGVOL_GROUP_EN)SYS_DIGVOL_GROUP_ENdvol_entry sys_digvol_group_ch_open(“mic_mic”, -1, effect_dvol_default_parm);effect-d_vol audio_dig_vol_group_hdl_get(sys_digvol_group, “mic_mic”);#elseeffect-d_vol audio_dig_vol_open((audio_dig_vol_param *)effect_dvol_default_parm);dvol_entry audio_dig_vol_entry_get(effect-d_vol);#endif /SYS_DIGVOL_GROUP_EN/}