Merge "replace char * with std::string" into rvc-dev am: 56c303b7 am: 714f5f68 am: 4edb8995

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

Change-Id: I7728552a79038bd9370b80bc8c5f2e1386b876cc