成员的完整列表，这些成员属于 nertc::INERtcAudioFrameObserver,包括所有继承而来的类成员

onAudioFrameDidRecord(NERtcAudioFrame *frame)=0	nertc::INERtcAudioFrameObserver	pure virtual
onAudioFrameWillPlayback(NERtcAudioFrame *frame)=0	nertc::INERtcAudioFrameObserver	pure virtual
onMixedAudioFrame(NERtcAudioFrame *frame)=0	nertc::INERtcAudioFrameObserver	pure virtual
onPlaybackAudioFrameBeforeMixing(uint64_t userID, NERtcAudioFrame *frame, channel_id_t cid)=0	nertc::INERtcAudioFrameObserver	pure virtual
onPlaybackSubstreamAudioFrameBeforeMixing(uint64_t userID, NERtcAudioFrame *frame, channel_id_t cid)=0	nertc::INERtcAudioFrameObserver	pure virtual
onSubstreamAudioFrameDidRecord(NERtcAudioFrame *frame)	nertc::INERtcAudioFrameObserver	virtual
~INERtcAudioFrameObserver() (定义于 nertc::INERtcAudioFrameObserver)	nertc::INERtcAudioFrameObserver	inlinevirtual