Find index position of List media instance in media list.
    Warning: the function will return the first matched position.
    The L{libvlc_media_list_lock} should be held upon entering this function.
    @param p_ml: a media list instance.
    @param p_md: media instance.
    @return: position of media instance or -1 if media not found.

def libvlc_media_list_index_of_item(p_ml, p_md):
    '''Find index position of List media instance in media list.
    Warning: the function will return the first matched position.
    The L{libvlc_media_list_lock} should be held upon entering this function.
    @param p_ml: a media list instance.
    @param p_md: media instance.
    @return: position of media instance or -1 if media not found.
    '''
    f = _Cfunctions.get('libvlc_media_list_index_of_item', None) or \
        _Cfunction('libvlc_media_list_index_of_item', ((1,), (1,),), None,
                    ctypes.c_int, MediaList, Media)
    return f(p_ml, p_md)