Merge "replace char * with std::string" into rvc-dev am: 56c303b7 am:...

Merge "replace char * with std::string" into rvc-dev am: 56c303b7 am: 22adeeaf am: 7a21e39e am: 7f463c56

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/11687549

Change-Id: Id8c905d0e9f0ef836712227758e8a78448e3ec14