Provides appropriate parameters to the on_playback functions.

def _map_player_request_to_func(self, player_request_type):
        """Provides appropriate parameters to the on_playback functions."""
        # calbacks for on_playback requests are optional
        view_func = self._intent_view_funcs.get(player_request_type, lambda: None)

        argspec = inspect.getargspec(view_func)
        arg_names = argspec.args
        arg_values = self._map_params_to_view_args(player_request_type, arg_names)

        return partial(view_func, *arg_values)