Merge "replace char * with std::string" into rvc-dev am: 56c303b772 am: 22adeeafd8 am: 7a21e39e5f am: 7f463c567a

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

Change-Id: Id8c905d0e9f0ef836712227758e8a78448e3ec14