]> git.sesse.net Git - ultimatescore/blobdiff - nageru/ultimate.lua
Integrate the stinger in the theme.
[ultimatescore] / nageru / ultimate.lua
index 2f863578d2231d87b6c623608747c19eeab23c6a..57436cfc0dc50502f60d6b38763809e8177dc05d 100644 (file)
@@ -1,29 +1,36 @@
--- Nageru theme for ultimate productions, based on the default theme.
-
-local transition_start = -2.0
-local transition_end = -1.0
-local transition_type = 0
-local transition_src_signal = 0
-local transition_dst_signal = 0
-
-local neutral_colors = {
-       {0.5, 0.5, 0.5},  -- Input 0.
-       {0.5, 0.5, 0.5},  -- Input 1.
-       {0.5, 0.5, 0.5},  -- Input 2.
-       {0.5, 0.5, 0.5},  -- Input 3.
-       {0.5, 0.5, 0.5},  -- Input 4.
-       {0.5, 0.5, 0.5}   -- Input 5.
-       -- Will also be filled with VIDEO_SIGNAL_NUM below.
+-- Nageru theme for TFK mini-tournament 2017, based on the default theme.
+
+local state = {
+       transition_start = -2.0,
+       transition_end = -1.0,
+       transition_type = 0,
+       transition_src_signal = 0,
+       transition_dst_signal = 0,
+
+       neutral_colors = {
+               {0.5, 0.5, 0.5},  -- Input 0.
+               {0.5, 0.5, 0.5},  -- Input 1.
+               {0.5, 0.5, 0.5},  -- Input 2.
+               {0.5, 0.5, 0.5},  -- Input 3.
+               {0.5, 0.5, 0.5},  -- Input 4.
+               {0.5, 0.5, 0.5}   -- Input 5.
+               -- Will also be filled with VIDEO_SIGNAL_NUM below.
+       },
+
+       overlay_transition_start = -2.0,
+       overlay_transition_end = -1.0,
+       overlay_alpha_src = 0.0,
+       overlay_alpha_dst = 1.0,
+       overlay_enabled = false,
+
+       stinger_in_progress = false,
+       stinger_frame = 0,
+       stinger_src_signal = 0,
+       stinger_dst_signal = 0,
+
+       live_signal_num = 0,
+       preview_signal_num = 1
 }
-
-local overlay_transition_start = -2.0
-local overlay_transition_end = -1.0
-local overlay_alpha_src = 0.0
-local overlay_alpha_dst = 1.0
-local overlay_enabled = false
-
-local live_signal_num = 0
-local preview_signal_num = 1
 local NUM_CAMERAS = 6  -- Remember to update neutral_colors, too.
 
 -- Valid values for live_signal_num and preview_signal_num.
@@ -37,7 +44,7 @@ local SBS_SIGNAL_NUM = NUM_CAMERAS
 local STATIC_SIGNAL_NUM = NUM_CAMERAS + 1
 local VIDEO_SIGNAL_NUM = NUM_CAMERAS + 2
 
-neutral_colors[VIDEO_SIGNAL_NUM - INPUT0_SIGNAL_NUM + 1] = {0.5, 0.5, 0.5};
+state.neutral_colors[VIDEO_SIGNAL_NUM - INPUT0_SIGNAL_NUM + 1] = {0.5, 0.5, 0.5}
 
 -- Preview-only signal showing the current signal with the overlay.
 -- Not valid for live_signal_num!
@@ -268,11 +275,10 @@ local sbs_chains = make_cartesian_product({
        return make_sbs_chain(input0_type, input0_overlay, input1_type, hq)
 end)
 
--- A chain to show a single input on screen.
-function make_simple_chain(input_deint, input_video, input_scale, has_overlay, hq)
+function make_simple_chain_no_finalize(input_deint, input_video, input_scale, has_overlay, hq)
        local chain = EffectChain.new(16, 9)
 
-       local input;
+       local input
        if input_video then
                input = chain:add_video_input(iptv_video, false)
        else
@@ -281,7 +287,7 @@ function make_simple_chain(input_deint, input_video, input_scale, has_overlay, h
        end
 
        local resample_effect, resize_effect
-       if scale then
+       if input_scale then
                if hq then
                        resample_effect = chain:add_effect(ResampleEffect.new())
                else
@@ -292,8 +298,6 @@ function make_simple_chain(input_deint, input_video, input_scale, has_overlay, h
        local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
        local overlay = possibly_make_overlay(has_overlay, chain, wb_effect)
 
-       chain:finalize(hq)
-
        return {
                chain = chain,
                input = input,
@@ -304,6 +308,13 @@ function make_simple_chain(input_deint, input_video, input_scale, has_overlay, h
        }
 end
 
+-- A chain to show a single input on screen.
+function make_simple_chain(input_deint, input_video, input_scale, has_overlay, hq)
+       local chain = make_simple_chain_no_finalize(input_deint, input_video, input_scale, has_overlay, hq)
+       chain.chain:finalize(hq)
+       return chain
+end
+
 -- Make all possible combinations of single-input chains.
 local simple_chains = make_cartesian_product({
        {"video", "live", "livedeint"},  -- input_type
@@ -316,6 +327,36 @@ local simple_chains = make_cartesian_product({
        return make_simple_chain(input_deint, input_video, input_scale, has_overlay, hq)
 end)
 
+-- A chain to show a single input on screen, with a stinger on top.
+function make_stinger_chain(input_deint, input_video, input_scale, has_overlay, stinger_frame, hq)
+       local chain = make_simple_chain_no_finalize(input_deint, input_video, input_scale, has_overlay, hq)
+       local filename = cef_path .. "/stinger/blur" .. string.rep("0", 3 - string.len(tostring(stinger_frame))) .. stinger_frame .. ".png"
+
+       local last
+       if has_overlay then
+               last = chain.overlay.overlay_effect
+       else
+               last = chain.wb_effect
+       end
+       local input = chain.chain:add_effect(ImageInput.new(filename))
+       chain.chain:add_effect(OverlayEffect.new(), last, input)
+       chain.chain:finalize(hq)
+       return chain
+end
+
+-- Single-input chains with various stinger frames on top.
+local stinger_chains = make_cartesian_product({
+       {"video", "live", "livedeint"},  -- input_type
+       {true, false},          -- input_scale
+       {true, false},          -- has_overlay
+       {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24},  -- stinger_frame
+       {true, false}           -- hq
+}, function(input_type, input_scale, has_overlay, stinger_frame, hq)
+       local input_deint = (input_type == "livedeint")
+       local input_video = (input_type == "video")
+       return make_stinger_chain(input_deint, input_video, input_scale, has_overlay, stinger_frame, hq)
+end)
+
 -- A chain to show a single static picture on screen. Never with HTML overlay.
 local static_chains = make_cartesian_product({
        {true, false}            -- hq
@@ -382,7 +423,7 @@ end
 -- and get_channel_resolution_raw() is that this one also can say that
 -- there's no signal.
 function get_channel_resolution(signal_num)
-       res = last_resolution[signal_num]
+       local res = last_resolution[signal_num]
        if (not res) or not res.is_connected then
                return "disconnected"
        end
@@ -472,17 +513,17 @@ end
 -- "transparent" is allowed.
 -- Will never be called for live (0) or preview (1).
 function channel_color(channel)
-       if transition_type ~= NO_TRANSITION then
-               if channel_involved_in(channel, transition_src_signal) or
-                  channel_involved_in(channel, transition_dst_signal) then
+       if state.transition_type ~= NO_TRANSITION then
+               if channel_involved_in(channel, state.transition_src_signal) or
+                  channel_involved_in(channel, state.transition_dst_signal) then
                        return "#f00"
                end
        else
-               if channel_involved_in(channel, live_signal_num) then
+               if channel_involved_in(channel, state.live_signal_num) then
                        return "#f00"
                end
        end
-       if channel_involved_in(channel, preview_signal_num) then
+       if channel_involved_in(channel, state.preview_signal_num) then
                return "#0f0"
        end
        return "transparent"
@@ -516,25 +557,25 @@ end
 -- The color is in linear light (not sRGB gamma).
 function set_wb(channel, red, green, blue)
        if is_plain_signal(channel - 2) then
-               neutral_colors[channel - 2 + 1] = { red, green, blue }
+               state.neutral_colors[channel - 2 + 1] = { red, green, blue }
        end
 end
 
 function finish_transitions(t)
-       if transition_type ~= NO_TRANSITION and t >= transition_end then
-               live_signal_num = transition_dst_signal
-               transition_type = NO_TRANSITION
+       if state.transition_type ~= NO_TRANSITION and t >= state.transition_end then
+               state.live_signal_num = state.transition_dst_signal
+               state.transition_type = NO_TRANSITION
        end
 
        -- Disable the overlay if it is no longer visible.
-       if overlay_enabled and t > overlay_transition_end and overlay_alpha_dst == 0.0 then
-               overlay_enabled = false
+       if state.overlay_enabled and t > state.overlay_transition_end and state.overlay_alpha_dst == 0.0 then
+               state.overlay_enabled = false
                print("Turning off overlay")
        end
 end
 
 function in_transition(t)
-       return t >= transition_start and t <= transition_end
+       return t >= state.transition_start and t <= state.transition_end
 end
 
 function is_sbs_participating_signal(signal_num)
@@ -549,12 +590,12 @@ end
 -- API ENTRY POINT
 -- Called every frame.
 function get_transitions(t)
-       if preview_signal_num == OVERLAY_SIGNAL_NUM then
-               if t < overlay_transition_end then
+       if state.preview_signal_num == OVERLAY_SIGNAL_NUM then
+               if t < state.overlay_transition_end then
                        -- Fade in progress.
                        return {}
                end
-               if overlay_enabled then
+               if state.overlay_enabled then
                        return {"Overlay off", "", "Fade ovl out"}
                else
                        return {"Overlay on", "", "Fade ovl in"}
@@ -567,20 +608,25 @@ function get_transitions(t)
                return {"Cut"}
        end
 
-       if live_signal_num == preview_signal_num then
+       if state.live_signal_num == state.preview_signal_num then
                -- No transitions possible.
                return {}
        end
 
-       if (is_plain_signal(live_signal_num) or live_signal_num == STATIC_SIGNAL_NUM) and
-          (is_plain_signal(preview_signal_num) or preview_signal_num == STATIC_SIGNAL_NUM) then
+       if (is_plain_signal(state.live_signal_num) and state.preview_signal_num == VIDEO_SIGNAL_NUM) or
+          (is_plain_signal(state.preview_signal_num) and state.live_signal_num == VIDEO_SIGNAL_NUM) then
+               return {"Cut", "Sting", "Fade"}
+       end
+
+       if (is_plain_signal(state.live_signal_num) or state.live_signal_num == STATIC_SIGNAL_NUM) and
+          (is_plain_signal(state.preview_signal_num) or state.preview_signal_num == STATIC_SIGNAL_NUM) then
                return {"Cut", "", "Fade"}
        end
 
        -- Various zooms.
-       if live_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(preview_signal_num) then
+       if state.live_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(state.preview_signal_num) then
                return {"Cut", "Zoom in"}
-       elseif is_sbs_participating_signal(live_signal_num) and preview_signal_num == SBS_SIGNAL_NUM then
+       elseif is_sbs_participating_signal(state.live_signal_num) and state.preview_signal_num == SBS_SIGNAL_NUM then
                return {"Cut", "Zoom out"}
        end
 
@@ -588,49 +634,50 @@ function get_transitions(t)
 end
 
 function swap_preview_live()
-       local temp = live_signal_num
-       live_signal_num = preview_signal_num
-       preview_signal_num = temp
+       local temp = state.live_signal_num
+       state.live_signal_num = state.preview_signal_num
+       state.preview_signal_num = temp
 end
 
 function start_transition(type_, t, duration)
-       transition_start = t
-       transition_end = t + duration
-       transition_type = type_
-       transition_src_signal = live_signal_num
-       transition_dst_signal = preview_signal_num
+       state.transition_start = t
+       state.transition_end = t + duration
+       state.transition_type = type_
+       state.transition_src_signal = state.live_signal_num
+       state.transition_dst_signal = state.preview_signal_num
+       state.stinger_in_progress = false
        swap_preview_live()
 end
 
 -- API ENTRY POINT
 -- Called when the user clicks a transition button.
 function transition_clicked(num, t)
-       if preview_signal_num == OVERLAY_SIGNAL_NUM then
+       if state.preview_signal_num == OVERLAY_SIGNAL_NUM then
                if num == 0 then
                        -- Cut.
-                       overlay_transition_start = -2.0
-                       overlay_transition_end = -1.0
-                       if overlay_enabled then
-                               overlay_enabled = false
-                               overlay_alpha_src = 0.0
-                               overlay_alpha_dst = 0.0
+                       state.overlay_transition_start = -2.0
+                       state.overlay_transition_end = -1.0
+                       if state.overlay_enabled then
+                               state.overlay_enabled = false
+                               state.overlay_alpha_src = 0.0
+                               state.overlay_alpha_dst = 0.0
                        else
-                               overlay_enabled = true
-                               overlay_alpha_src = 1.0
-                               overlay_alpha_dst = 1.0
+                               state.overlay_enabled = true
+                               state.overlay_alpha_src = 1.0
+                               state.overlay_alpha_dst = 1.0
                        end
                elseif num == 2 then
                        -- Fade.
-                       overlay_transition_start = t
-                       overlay_transition_end = t + 1.0
-                       if overlay_enabled then
-                               overlay_alpha_src = 1.0
-                               overlay_alpha_dst = 0.0
+                       state.overlay_transition_start = t
+                       state.overlay_transition_end = t + 1.0
+                       if state.overlay_enabled then
+                               state.overlay_alpha_src = 1.0
+                               state.overlay_alpha_dst = 0.0
                        else
-                               overlay_alpha_src = 0.0
-                               overlay_alpha_dst = 1.0
+                               state.overlay_alpha_src = 0.0
+                               state.overlay_alpha_dst = 1.0
                        end
-                       overlay_enabled = true
+                       state.overlay_enabled = true
                end
                return
        end
@@ -639,39 +686,56 @@ function transition_clicked(num, t)
                -- Cut.
                if in_transition(t) then
                        -- Ongoing transition; finish it immediately before the cut.
-                       finish_transitions(transition_end)
+                       finish_transitions(state.transition_end)
                end
 
                swap_preview_live()
+               state.stinger_in_progress = false
        elseif num == 1 then
-               -- Zoom.
+               -- Zoom or sting.
                finish_transitions(t)
 
-               if live_signal_num == preview_signal_num then
+               if state.live_signal_num == state.preview_signal_num then
                        -- Nothing to do.
                        return
                end
 
-               if is_plain_signal(live_signal_num) and is_plain_signal(preview_signal_num) then
+               if (is_plain_signal(state.live_signal_num) and state.preview_signal_num == VIDEO_SIGNAL_NUM) or
+                  (is_plain_signal(state.preview_signal_num) and state.live_signal_num == VIDEO_SIGNAL_NUM) then
+                       -- Sting.
+                       if stinger_in_progress then
+                               return
+                       end
+
+                       io.write("Inserting stinger from " .. state.live_signal_num .. " to " .. state.live_signal_num .. "\n")
+                       state.stinger_in_progress = true
+                       state.stinger_frame = 0
+                       state.stinger_src_signal = state.live_signal_num
+                       state.stinger_dst_signal = state.preview_signal_num
+                       return
+               end
+
+               if is_plain_signal(state.live_signal_num) and is_plain_signal(state.preview_signal_num) then
                        -- We can't zoom between these. Just make a cut.
-                       io.write("Cutting from " .. live_signal_num .. " to " .. live_signal_num .. "\n")
+                       io.write("Cutting from " .. state.live_signal_num .. " to " .. state.live_signal_num .. "\n")
                        swap_preview_live()
+                       state.stinger_in_progress = false
                        return
                end
 
-               if (live_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(preview_signal_num)) or
-                  (preview_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(live_signal_num)) then
+               if (state.live_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(state.preview_signal_num)) or
+                  (state.preview_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(state.live_signal_num)) then
                        start_transition(ZOOM_TRANSITION, t, 1.0)
                end
        elseif num == 2 then
                finish_transitions(t)
 
                -- Fade.
-               if (live_signal_num ~= preview_signal_num) and
-                  (is_plain_signal(live_signal_num) or
-                   live_signal_num == STATIC_SIGNAL_NUM) and
-                  (is_plain_signal(preview_signal_num) or
-                   preview_signal_num == STATIC_SIGNAL_NUM) then
+               if (state.live_signal_num ~= state.preview_signal_num) and
+                  (is_plain_signal(state.live_signal_num) or
+                   state.live_signal_num == STATIC_SIGNAL_NUM) and
+                  (is_plain_signal(state.preview_signal_num) or
+                   state.preview_signal_num == STATIC_SIGNAL_NUM) then
                        start_transition(FADE_TRANSITION, t, 1.0)
                else
                        -- Fades involving SBS are ignored (we have no chain for it).
@@ -681,55 +745,55 @@ end
 
 -- API ENTRY POINT
 function channel_clicked(num)
-       preview_signal_num = num
+       state.preview_signal_num = num
 end
 
-function get_fade_chain(signals, t, width, height, input_resolution)
-       local input0_type = get_input_type(signals, transition_src_signal)
-       local input0_scale = needs_scale(signals, transition_src_signal, width, height)
-       local input1_type = get_input_type(signals, transition_dst_signal)
-       local input1_scale = needs_scale(signals, transition_dst_signal, width, height)
-       local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][overlay_enabled][true]
-       prepare = function()
+function get_fade_chain(state, signals, t, width, height, input_resolution)
+       local input0_type = get_input_type(signals, state.transition_src_signal)
+       local input0_scale = needs_scale(signals, state.transition_src_signal, width, height)
+       local input1_type = get_input_type(signals, state.transition_dst_signal)
+       local input1_scale = needs_scale(signals, state.transition_dst_signal, width, height)
+       local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][state.overlay_enabled][true]
+       local prepare = function()
                if input0_type == "live" or input0_type == "livedeint" then
-                       chain.input0.input:connect_signal(transition_src_signal)
+                       chain.input0.input:connect_signal(state.transition_src_signal)
                end
                if input0_type ~= "static" then
-                       set_neutral_color_from_signal(chain.input0.wb_effect, transition_src_signal)
+                       set_neutral_color_from_signal(state, chain.input0.wb_effect, state.transition_src_signal)
                end
                set_scale_parameters_if_needed(chain.input0, width, height)
                if input1_type == "live" or input1_type == "livedeint" then
-                       chain.input1.input:connect_signal(transition_dst_signal)
+                       chain.input1.input:connect_signal(state.transition_dst_signal)
                end
                if input1_type ~= "static" then
-                       set_neutral_color_from_signal(chain.input1.wb_effect, transition_dst_signal)
+                       set_neutral_color_from_signal(state, chain.input1.wb_effect, state.transition_dst_signal)
                end
                set_scale_parameters_if_needed(chain.input1, width, height)
-               local tt = calc_fade_progress(t, transition_start, transition_end)
+               local tt = calc_fade_progress(t, state.transition_start, state.transition_end)
 
                chain.mix_effect:set_float("strength_first", 1.0 - tt)
                chain.mix_effect:set_float("strength_second", tt)
 
                -- The commentator output has no overlay on it.
                local extra_alpha_factor = 1.0
-               if not simple_signal_has_overlay(transition_src_signal) and
-                  not simple_signal_has_overlay(transition_dst_signal) then
+               if not simple_signal_has_overlay(state.transition_src_signal) and
+                  not simple_signal_has_overlay(state.transition_dst_signal) then
                        extra_alpha_factor = 0.0
-               elseif not simple_signal_has_overlay(transition_src_signal) then
+               elseif not simple_signal_has_overlay(state.transition_src_signal) then
                        extra_alpha_factor = tt
-               elseif not simple_signal_has_overlay(transition_dst_signal) then
+               elseif not simple_signal_has_overlay(state.transition_dst_signal) then
                        extra_alpha_factor = 1.0 - tt
                end
-               prepare_overlay_live(chain, t, extra_alpha_factor)
+               prepare_overlay_live(state, chain, t, extra_alpha_factor)
        end
        return chain.chain, prepare
 end
 
 -- SBS code (live_signal_num == SBS_SIGNAL_NUM, or in a transition to/from it).
-function get_sbs_chain(signals, t, width, height, input_resolution)
+function get_sbs_chain(state, signals)
        local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
        local input1_type = get_input_type(signals, INPUT4_SIGNAL_NUM)
-       return sbs_chains[input0_type][overlay_enabled][input1_type][true]
+       return sbs_chains[input0_type][state.overlay_enabled][input1_type][true]
 end
 
 local last_rate = 0.0
@@ -786,11 +850,21 @@ function get_chain(num, t, width, height, signals)
        end
        last_resolution = input_resolution
 
+       -- Make a (semi-shallow) copy of the current state, so that the returned prepare function
+       -- is unaffected by state changes made by the UI before it is rendered.
+       local state_copy = {}
+       for key, value in pairs(state) do
+               state_copy[key] = value
+       end
+       for key, value in pairs(state.neutral_colors) do
+               state_copy.neutral_colors[key] = value
+       end
+
        -- Save some CPU time if we're not having SBS on live.
        local new_rate
-       if live_signal_num == SBS_SIGNAL_NUM or
-          preview_signal_num == SBS_SIGNAL_NUM or
-          transition_type == ZOOM_TRANSITION then
+       if state.live_signal_num == SBS_SIGNAL_NUM or
+          state.preview_signal_num == SBS_SIGNAL_NUM or
+          state.transition_type == ZOOM_TRANSITION then
                new_rate = 1.0
        else
                new_rate = 0.0001
@@ -804,42 +878,53 @@ function get_chain(num, t, width, height, signals)
        if num == 0 then  -- Live.
                -- See if we're in a transition.
                finish_transitions(t)
-               if transition_type == ZOOM_TRANSITION then
+               if state.transition_type == ZOOM_TRANSITION then
                        -- Transition in or out of SBS.
-                       local chain = get_sbs_chain(signals, t, width, height, input_resolution)
-                       prepare = function()
-                               prepare_sbs_chain(chain, calc_zoom_progress(t), transition_type, transition_src_signal, transition_dst_signal, width, height, input_resolution)
-                               prepare_overlay_live(chain, t, 1.0)
+                       local chain = get_sbs_chain(state_copy, signals)
+                       local prepare = function()
+                               prepare_sbs_chain(state_copy, chain, calc_zoom_progress(t), state_copy.transition_type, state_copy.transition_src_signal, state_copy.transition_dst_signal, width, height, input_resolution)
+                               prepare_overlay_live(state_copy, chain, t, 1.0)
                        end
                        return chain.chain, prepare
-               elseif transition_type == NO_TRANSITION and live_signal_num == SBS_SIGNAL_NUM then
+               elseif state.transition_type == NO_TRANSITION and state.live_signal_num == SBS_SIGNAL_NUM then
                        -- Static SBS view.
-                       local chain = get_sbs_chain(signals, t, width, height, input_resolution)
-                       prepare = function()
-                               prepare_sbs_chain(chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
-                               prepare_overlay_live(chain, t, 1.0)
+                       local chain = get_sbs_chain(state_copy, signals)
+                       local prepare = function()
+                               prepare_sbs_chain(state_copy, chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
+                               prepare_overlay_live(state_copy, chain, t, 1.0)
                        end
                        return chain.chain, prepare
-               elseif transition_type == FADE_TRANSITION then
-                       return get_fade_chain(signals, t, width, height, input_resolution)
-               elseif is_plain_signal(live_signal_num) then
-                       local input_type = get_input_type(signals, live_signal_num)
-                       local input_scale = needs_scale(signals, live_signal_num, width, height)
-                       local overlay_really_enabled = overlay_enabled and simple_signal_has_overlay(live_signal_num)
-                       local chain = simple_chains[input_type][input_scale][overlay_really_enabled][true]
-                       prepare = function()
+               elseif state.transition_type == FADE_TRANSITION then
+                       return get_fade_chain(state_copy, signals, t, width, height, input_resolution)
+               elseif is_plain_signal(state.live_signal_num) then
+                       local input_type = get_input_type(signals, state.live_signal_num)
+                       local input_scale = needs_scale(signals, state.live_signal_num, width, height)
+                       local overlay_really_enabled = state.overlay_enabled and simple_signal_has_overlay(state.live_signal_num)
+                       local chain
+                       if state.stinger_in_progress then
+                               chain = stinger_chains[input_type][input_scale][overlay_really_enabled][state.stinger_frame][true]
+                               state.stinger_frame = state.stinger_frame + 1
+                               if state.stinger_frame >= 25 then
+                                       state.stinger_in_progress = false
+                                       state.preview_signal_num = state.stinger_src_signal
+                                       state.live_signal_num = state.stinger_dst_signal
+                               end
+                       else
+                               chain = simple_chains[input_type][input_scale][overlay_really_enabled][true]
+                       end
+                       local prepare = function()
                                if input_type ~= "video" then
-                                       chain.input:connect_signal(live_signal_num)
+                                       chain.input:connect_signal(state.live_signal_num)
                                end
-                               set_neutral_color_from_signal(chain.wb_effect, live_signal_num)
+                               set_neutral_color_from_signal(state_copy, chain.wb_effect, state.live_signal_num)
                                set_scale_parameters_if_needed(chain, width, height)
-                               prepare_overlay_live(chain, t, 1.0)
+                               prepare_overlay_live(state_copy, chain, t, 1.0)
                        end
                        return chain.chain, prepare
-               elseif live_signal_num == STATIC_SIGNAL_NUM then  -- Static picture.
+               elseif state.live_signal_num == STATIC_SIGNAL_NUM then  -- Static picture.
                        local chain = static_chains[true]
-                       prepare = function()
-                               prepare_overlay_live(chain, t, 1.0)  -- FIXME: Should this ever be here?
+                       local prepare = function()
+                               prepare_overlay_live(state_copy, chain, t, 1.0)  -- FIXME: Should this ever be here?
                        end
                        return chain.chain, prepare
                else
@@ -851,16 +936,16 @@ function get_chain(num, t, width, height, signals)
        -- The M/E preview matches what we'd put live by doing a transition, as always.
        local show_overlay = false
        if num == 1 then  -- Preview.
-               if preview_signal_num == OVERLAY_SIGNAL_NUM then
-                       num = live_signal_num + 2
-                       show_overlay = not overlay_enabled
+               if state.preview_signal_num == OVERLAY_SIGNAL_NUM then
+                       num = state.live_signal_num + 2
+                       show_overlay = not state.overlay_enabled
 
-                       if transition_type ~= NO_TRANSITION then
-                               num = transition_dst_signal + 2
+                       if state.transition_type ~= NO_TRANSITION then
+                               num = state.transition_dst_signal + 2
                        end
                else
-                       num = preview_signal_num + 2
-                       show_overlay = overlay_enabled and simple_signal_has_overlay(preview_signal_num)
+                       num = state.preview_signal_num + 2
+                       show_overlay = state.overlay_enabled and simple_signal_has_overlay(state.preview_signal_num)
                end
        end
 
@@ -870,11 +955,11 @@ function get_chain(num, t, width, height, signals)
                local input_type = get_input_type(signals, signal_num)
                local input_scale = needs_scale(signals, signal_num, width, height)
                local chain = simple_chains[input_type][input_scale][show_overlay][false]
-               prepare = function()
+               local prepare = function()
                        if input_type ~= "video" then
                                chain.input:connect_signal(signal_num)
                        end
-                       set_neutral_color(chain.wb_effect, neutral_colors[signal_num + 1])
+                       set_neutral_color(chain.wb_effect, state_copy.neutral_colors[signal_num + 1])
                        set_scale_parameters_if_needed(chain, width, height)
                        prepare_overlay_static(chain, t)
                end
@@ -884,20 +969,20 @@ function get_chain(num, t, width, height, signals)
                local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
                local input1_type = get_input_type(signals, INPUT4_SIGNAL_NUM)
                local chain = sbs_chains[input0_type][show_overlay][input1_type][false]
-               prepare = function()
-                       prepare_sbs_chain(chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
+               local prepare = function()
+                       prepare_sbs_chain(state_copy, chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
                end
                return chain.chain, prepare
        end
        if num == STATIC_SIGNAL_NUM + 2 then
                local chain = static_chains[false]
-               prepare = function()
+               local prepare = function()
                        prepare_overlay_static(chain, t)
                end
                return chain.chain, prepare
        end
        if num == OVERLAY_SIGNAL_NUM + 2 then
-               prepare = function()
+               local prepare = function()
 --                     prepare_overlay(overlay_chain_lq, t)
                end
                return overlay_chain_lq, prepare
@@ -933,11 +1018,11 @@ function pos_from_top_left(x, y, width, height, screen_width, screen_height)
        }
 end
 
-function prepare_sbs_chain(chain, t, transition_type, src_signal, dst_signal, screen_width, screen_height, input_resolution)
+function prepare_sbs_chain(state, chain, t, transition_type, src_signal, dst_signal, screen_width, screen_height, input_resolution)
        chain.input0.input:connect_signal(0)
        chain.input1.input:connect_signal(4)
-       set_neutral_color(chain.input0.wb_effect, neutral_colors[1])
-       set_neutral_color(chain.input1.wb_effect, neutral_colors[5])
+       set_neutral_color(chain.input0.wb_effect, state.neutral_colors[1])
+       set_neutral_color(chain.input1.wb_effect, state.neutral_colors[5])
 
        -- Both inputs are the same size (true side-by-side).
        local pos0 = pos_from_top_left(1280 - 616 - 16, 186, 616, 347, screen_width, screen_height)
@@ -1084,14 +1169,14 @@ function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0,
        end
 end
 
-function prepare_overlay_live(chain, t, extra_alpha_factor)
+function prepare_overlay_live(state, chain, t, extra_alpha_factor)
        if chain.overlay then
-               local tt = calc_fade_progress(t, overlay_transition_start, overlay_transition_end)
-               overlay_alpha = overlay_alpha_src + tt * (overlay_alpha_dst - overlay_alpha_src)
+               local tt = calc_fade_progress(t, state.overlay_transition_start, state.overlay_transition_end)
+               local overlay_alpha = state.overlay_alpha_src + tt * (state.overlay_alpha_dst - state.overlay_alpha_src)
                overlay_alpha = overlay_alpha * extra_alpha_factor
-               --print("overlay_alpha=" .. overlay_alpha .. " [" .. overlay_alpha_src .. "," .. overlay_alpha_dst .. "]@" .. tt)
-               if t > overlay_transition_end and overlay_alpha_dst == 0.0 then
-                       overlay_enabled = false  -- Takes effect next frame.
+               --print("overlay_alpha=" .. overlay_alpha .. " [" .. state.overlay_alpha_src .. "," .. state.overlay_alpha_dst .. "]@" .. tt)
+               if t > state.overlay_transition_end and state.overlay_alpha_dst == 0.0 then
+                       state.overlay_enabled = false  -- Takes effect next frame.
        --              print("Turning off overlay")
                end
                chain.overlay.multiply_effect:set_vec4("factor", overlay_alpha, overlay_alpha, overlay_alpha, overlay_alpha)
@@ -1108,19 +1193,19 @@ function set_neutral_color(effect, color)
        effect:set_vec3("neutral_color", color[1], color[2], color[3])
 end
 
-function set_neutral_color_from_signal(effect, signal)
+function set_neutral_color_from_signal(state, effect, signal)
        if is_plain_signal(signal) then
-               set_neutral_color(effect, neutral_colors[signal - INPUT0_SIGNAL_NUM + 1])
+               set_neutral_color(effect, state.neutral_colors[signal - INPUT0_SIGNAL_NUM + 1])
        end
 end
 
 function calc_zoom_progress(t)
-       if t < transition_start then
+       if t < state.transition_start then
                return 0.0
-       elseif t > transition_end then
+       elseif t > state.transition_end then
                return 1.0
        else
-               local tt = (t - transition_start) / (transition_end - transition_start)
+               local tt = (t - state.transition_start) / (state.transition_end - state.transition_start)
                -- Smooth it a bit.
                return math.sin(tt * 3.14159265358 * 0.5)
        end