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: 368d21e9 am: fd3695e4

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

Change-Id: Ie885661a0a8eb41e9d40a192b8f2b25d117c86d6