val primaryButtons: LiveData<List<TtButtonViewModel>>

Primary media buttons are the most important and frequently used controls for managing playback, ideally positioned in a way that is easily reached by the driver.

The list of controls is controlled by MediaButtonsConfiguration and can be updated when the MediaControlContext changes.

The maximum number of buttons is limited by MediaButtonsConfiguration.primaryMediaButtonsLimit. If the number of controls is greater than the limit, controls with lower MediaControlPriority are filtered out. The order is preserved. If two controls have the same priority, the first in order is selected.