Android audio programming nightmare - soundpool, audiotrack arrghh?

Question

I\'ve built a simple music sequencer Android app that plays multiple audio files.

Originally I was using SoundPool to play mp3 files and it worked perfectly on 2.3.4

Answer 1

In the High Performance Audio session at Google I/O 2013 (introduced by Ian Ni-Lewis who commented on the original post. I'm surprised he didn't pick up on this), they talk about the Nexus 4. In the video of the presentation, jump to 27:25.

Unlike many other devices that use a native 44.1kHz sample rate, the Nexus 4 uses 48kHz. If you are submitting data at 44.1kHz, it will have to go through the resampler which is on the slow path. Another difference is that the buffer size on the Nexus 4 is 240 frames which can cause a regular jitter in your callback. This is all explained in the linked video.