// In pure audio mode, the main instance (vocal instance) needs to turn on black frame compensation to carry the SEI message.
mTRTCCloud.callExperimentalAPI("{\\"api\\":\\"enableBlackStream\\",\\"params\\": {\\"enable\\":true}}");

mAudioEffectManager.setMusicObserver(mCurPlayMusicId, new TXAudioEffectManager.TXMusicPlayObserver() {
    @Override
    public void onPlayProgress(int id, long curPtsMS, long durationMS) {
        JSONObject jsonObject = new JSONObject();
        // Current NTP time
        long ntpTime = TXLiveBase.getNetworkTimestamp();
        jsonObject.put("bgmProgressTime", curTime);
        jsonObject.put("ntpTime", ntpTime);
        jsonObject.put("musicId", musicId);
        jsonObject.put("duration", duration);
        jsonObject.toString().getBytes();
        mTRTCCloud.sendSEIMsg(jsonObject.toString().getBytes(), 1);
    }
}


// Local lyrics synchronization
mAudioEffectManager.setMusicObserver(mCurPlayMusicId, new TXAudioEffectManager.TXMusicPlayObserver() {
    @Override
    public void onPlayProgress(int id, long curPtsMS, long durationMS) {
        ...
        // TODO Update lyrics widget logic:
        // Determine whether to seek the lyrics widget based on the latest progress and local lyrics progress error
        ...
    }
}

// Remote lyrics synchronization
@Override
public void onRecvSEIMsg(String userId, byte[] data) {
    String result = new String(data);
    JSONObject jsonObject = new JSONObject(result);
    long bgmProgressTime = jsonObject.getLong("bgmProgressTime");
    long ntpTime = jsonObject.getLong("ntpTime");
    String musicId = jsonObject.getString("musicId");
    long duration = jsonObject.getLong("duration");
    ...
    // TODO Update lyrics widget logic:
    // If you reuse the TUIKaraoke component's lyrics widget, 
    //please refer to the code logic of the TUIKaraoke LyricsView section to synchronize the lyrics widget progress.
    ...
}