How To Use Multiple Android Surface's In Unity Using OVR

Im want to play multiple players (ExoPlayer) in my Unity VR app. Single player I am already done. But how can I create multiple players (Android Surface's actually).

I know about this functions:

OVR_Media_Surface_Init();
OVR_Media_Surface_SetEventBase(int eventBase);
OVR_Media_Surface_GetObject();
OVR_Media_Surface_GetNativeTexture();
OVR_Media_Surface_SetTextureParms(int texWidth, int texHeight);

But OVR_Media_Surface_GetObject return the same surface for all players.