https://webrtc.googlesource.com/src/+/b0c1b4e24d5250f3d9def9ccc3300e9a1237953f/webrtc/media/base/videosourcebase.h
webrtc/media/base/videosourcebase.h - src - Git at Google
webrtcmediabasehsrc
https://webrtc.googlesource.com/src/webrtc/+/4cd0b10627c8ac05bfeacc636e4c5d8869b2a848/media/base/videosourcebase.cc
media/base/videosourcebase.cc - src/webrtc - Git at Google
mediabaseccsrcwebrtc