In the browser I'm most familiar with the internals of: most of the playback logic is done by shared software, and the decode of the video track is done in hard

In the browser I'm most familiar with the internals of: most of the playback logic is done by shared software, and the decode of the video track is done in hardware in the common case, for both encrypted and unencrypted videos. There are some forks in the path but a lot of commonality.