IRTCChannel

SRTC::IRTCChannel* ch = nullptr;
if (engine->createChannel(token, &ch) != SRTC::StatusCode::OK) {
    return;   // 失败时 ch 一定是 nullptr
}

// 1) 配置（join 前才有意义的项见 IRTCChannelSetting）
SRTC::IRTCChannelSetting* set = nullptr;
ch->getSetting(&set);
set->set_stream_model(1);

// 2) 事件回调，必须在 join() 之前
ch->setEventHandler(this);

// 3) 进入频道
if (ch->join() != SRTC::StatusCode::OK) {
    engine->leaveChannel(ch->getChannelId());   // 失败的频道对象也要回收
    ch = nullptr;
    return;
}

virtual const char* getChannelId() = 0;

virtual StatusCode getSetting(IRTCChannelSetting** set) = 0;

virtual StatusCode setEventHandler(IRTCChannelEvent* e) = 0;

virtual StatusCode join() = 0;

virtual StatusCode getMe(char** s, int* c) = 0;

virtual StatusCode getChannel(char** s, int* c) = 0;

virtual StatusCode getMembers(char** s, int* c) = 0;

virtual StatusCode getMember(const char* uid, char** s, int* c) = 0;
virtual StatusCode getMemberByLinkId(const char* linkId, char** s, int* c) = 0;
virtual StatusCode getMemberByLinkId(int linkId, char** s, int* c) = 0;
		

virtual StatusCode getCameraTrack(const char* track_key,IRTCLocalCameraTrack ** track) = 0;

virtual StatusCode getScreenTrack(const char* track_key,IRTCLocalScreenTrack ** track) = 0;

virtual StatusCode getAudioTrack(const char* track_key,IRTCLocalMicTrack** track) = 0;

virtual StatusCode getRemoteAudioTrack(const char* uid, const char* trackid, IRTCRemoteAudioTrack** track) = 0;

virtual StatusCode getRemoteVideoTrack(const char* uid, const char* trackid, IRTCRemoteVideoTrack** track) = 0;

virtual StatusCode getMCUVideoTrack(IRTCRemoteVideoTrack** track) = 0;

virtual StatusCode subscribe(IRTCTrack* tk ) = 0;

virtual StatusCode unsubscribe(IRTCTrack* tk ) = 0;

virtual StatusCode publish(IRTCTrack* tk, RTCVideoPublishOptions* opt) = 0;

virtual StatusCode publish(IRTCTrack* tk, RTCAudioPublishOptions* opt) = 0;