How to record internal audio? - android

I'm currently developing a mobile game that can be recorded while playing. And microphone is need during the game.
So I want to record the game background music, the game sound effects ,and
human voice from microphone.
I can record all the sounds through microphone now. But I can not hear the background music and sound effects clearly after the record is finished.
So，I want to know If I can record all the game sounds internally. I googled a lot And I found AudioRecord can do that by set the audio source to REMOTE_SUBMIX. But this is not allowed by non-system app in android.
So, is there any way to record internal audio in Android?

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