am 15bb40ea: Merge "Audio recorder missing a callback protector"

* commit '15bb40eaebf1e1d0445fb9bcfc9c2b6eb57dff5f':
  Audio recorder missing a callback protector
tree: 5c976d1fb176f9cd5dc04f1d68d0af4fe7a4b7b3
  1. doc/
  2. include/
  3. src/
  4. tests/
  5. tools/