Encoding AAC Audio using AudioRecord and MediaCodec on Android

Question

I am trying to encode aac audio using android AudioRecord and MediaCodec. I have created a encoder class very similar to (Encoding H.264 from camera with Android MediaCodec)

Answer 1

You can use Android's MediaMuxer to package the raw streams created by MediaCodec into a .mp4 file. Bonus: AAC packets contained in a .mp4 don't require the ADTS header.

I've got a working example of this technique on Github.