Please add sound playback progress functions

cocos2d-x C++
#1

cocos2d-x 3.0
Sometimes you need to know the progress of sound playback, please add sound playback progress functions

cocos框架不应该只为游戏而生

而一个非常不足的功能就是声音播放的时候获取不到进度，希望能添加这个功能。

thanks

#2

cocos2d-x now is used for game developing.
What do you want to do with cocos2d-x?