fade in/out reference

local function fade_in(cur_amb_vol, timer, counter)
    if fade_in_check_time ~= nil and time_global() - fade_in_check_time <= timer then return end
    fade_in_check_time = time_global()
    if cur_amb_vol<ambient_vol then
        cur_amb_vol=cur_amb_vol+counter
        if cur_amb_vol>ambient_vol then cur_amb_vol=ambient_vol end
        --printf("fade_in:SET = "..ambient_vol)
        get_console():execute('snd_volume_music '..cur_amb_vol)
    end
end

local function fade_out(cur_amb_vol, timer, counter)
    if fade_out_check_time ~= nil and time_global() - fade_out_check_time <= timer then return end
    fade_out_check_time = time_global()
    if cur_amb_vol>0 then
        cur_amb_vol=cur_amb_vol-counter
        if cur_amb_vol<0 then cur_amb_vol=0 end
        --printf("fade_out:SET = "..ambient_vol)
        get_console():execute('snd_volume_music '..cur_amb_vol)
    end
end

function fades()
    --' Distemper 05.2008 --
    local actor = db.actor
    if actor:alive() then
        local playing_back = IsDynamicMusic()
        local actor_pos = actor:position()
        for k, object in pairs(npc_table) do
            local object_id = object:id()
            if not playing_back and play_combat ~= 0 then
                stop_combat(object_id)
            elseif playing_back    then
                if object:alive() then
                    if play_local_combat(actor, object, actor_pos, object_id) then
                        break
                    end
                    play_local_suspence(actor, object, actor_pos, object_id)
                end
            end
        end
    end
    --' end  --

    local cur_amb_vol = get_console():get_float('snd_volume_music')
    if music then
        fade_out(cur_amb_vol, 100, 0.1)
    else
        if db.storage.silence_zone_table and actor:alive() then
            local actor_pos = actor:position()
            local flag = 0
            for k,v in pairs(db.storage.silence_zone_table) do
                local zone = db.zone_by_name[v]
                if zone:inside(actor_pos) then
                    flag = 1
                    break
                end
            end
            if flag == 1 then
                fade_out(cur_amb_vol, 1000, 0.1)
            else
                fade_in(cur_amb_vol, 1000, 0.05)
            end
        else
            fade_in(cur_amb_vol, 100, 0.05)
        end
    end
end
function restore_ambient_on_end()
    if music_obj and music_obj:playing() then music_obj:stop() end
    --printf("restore_ambient_on_end:SET = "..ambient_vol)
    get_console():execute('snd_volume_music '..ambient_vol)
end
function main_menu_on()
    --printf("main_menu_on:SET = "..ambient_vol)
    get_console():execute('snd_volume_music '..ambient_vol)
end
function main_menu_off()
    local cur_amb = get_console():get_float('snd_volume_music')
    if cur_amb~=ambient_vol then
        ambient_vol = cur_amb
    end
    --printf("main_menu_off:SET = "..ambient_vol)
    get_console():execute('snd_volume_music '..ambient_vol)
end