If it's possible to use BLE and Bluetooth audio (a2dp) at time time?

[yangff]

Hi,
I'm making something looks like bluetooth headset/speaker but to save battery energy as much as possible. So, in most time it stays quiet and working on BLE. Only when it's playing music, it turn to bluetooth classical. And this process makes sense to me. (I'm not familar with Bluetooth, if it's not possible?)
However, in the example of gatt and a2dp_sink in ESP-IDF, it looks like that gatt and a2dp are using two different API? Can I use them together?