MainActivityViewModel.kt

class MainActivityViewModel: ViewModel() {

    val videoUrl = "https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8"

    enum class VideoPlaybackState {
        STOPPED,
        PLAYING
    }
    
    enum class VideoLayoutState {
        EMBEDDED,
        FULLSCREEN,
        PIP
    }

    private var showInPipMode = false

    private var currentOrientation: Int = Configuration.ORIENTATION_UNDEFINED
    
    private val _playbackState = MutableLiveData<VideoPlaybackState>().apply {
        value = VideoPlaybackState.STOPPED
    }
    val playbackState: LiveData<VideoPlaybackState> = _playbackState

    private val _layoutState = MutableLiveData<VideoLayoutState>().apply {
        value = VideoLayoutState.EMBEDDED
    }
    val layoutState: LiveData<VideoLayoutState> = Transformations.map(_layoutState) { newState ->
        showInPipMode = when (newState) {
            VideoLayoutState.PIP -> true
            VideoLayoutState.EMBEDDED -> false
            else -> showInPipMode
        }

        return@map newState
    }
}