Media: support song detection on macOS

[CarterLi]

Will do player tomorrow if I have time

[LinusDierheimer]

I can't test it, but code wise it seems fine. Thanks a lot!

[LinusDierheimer]

I noticed that you used objective c, but i don't see anything that requires the use of it. Why not stay in c?

And is the media remote framework guaranteed to exist on MacOS? If yes we can just link against it.

[CarterLi]

I noticed that you used objective c, but i don't see anything that requires the use of it. Why not stay in c?

using of <CoreFoundation/CoreFoundation.h> requires obj-c ( which is a obj-c header file )

Also notice the usage of ^ block syntax ( may also be provided as a C extension )

And is the media remote framework guaranteed to exist on MacOS?

Yes, at least in newer version

If yes we can just link against it.

No. /System/Library/PrivateFrameworks/MediaRemote.framework/MediaRemote is a private framework, which cannot be directly linked against. MediaRemote.framework isn't in the framework search path, -framework /System/Library/PrivateFrameworks/MediaRemote.framework doesn't work and MediaRemote.framework provides no header files.

[LinusDierheimer]

Then i am completely fine with the current state.