]> git.sesse.net Git - ultimatescore/blobdiff - nageru/ultimate.lua
Bring back the Trøndisk branding.
[ultimatescore] / nageru / ultimate.lua
index ecd43c72c23517d0b29f18cb2cf2cf28475ab07e..277c333056096aafb258ae8aa9afabfeba39262c 100644 (file)
@@ -1,38 +1,53 @@
 -- Nageru theme for TFK mini-tournament 2017, 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.
+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,
+
+       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.
 local INPUT0_SIGNAL_NUM = 0
 local INPUT1_SIGNAL_NUM = 1
 local INPUT2_SIGNAL_NUM = 2
-local STATIC_SIGNAL_NUM = 3
+local INPUT3_SIGNAL_NUM = 3
+local INPUT4_SIGNAL_NUM = 4
+local INPUT5_SIGNAL_NUM = 5
+local SBS_SIGNAL_NUM = NUM_CAMERAS
+local STATIC_SIGNAL_NUM = NUM_CAMERAS + 1
+local VIDEO_SIGNAL_NUM = NUM_CAMERAS + 2
+
+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!
-local OVERLAY_SIGNAL_NUM = 4
+local OVERLAY_SIGNAL_NUM = NUM_CAMERAS + 3
 
 -- Valid values for transition_type. (Cuts are done directly, so they need no entry.)
 local NO_TRANSITION = 0
+local ZOOM_TRANSITION = 1
 local FADE_TRANSITION = 2
 
 -- Last width/height/frame rate for each channel, if we have it.
@@ -40,8 +55,22 @@ local FADE_TRANSITION = 2
 -- frame and not per field, since we deinterlace.
 local last_resolution = {}
 
-local caspar_input = VideoInput.new("unix:///tmp/caspar.sock", Nageru.VIDEO_FORMAT_BGRA)
-caspar_input:change_rate(2.0)
+local cef_path = Nageru.THEME_PATH:match("(.*)/nageru/")
+local cef_input = HTMLInput.new("file://" .. cef_path .. "/score.html")
+cef_input:execute_javascript_async("play()")
+
+local bg_video = VideoInput.new(cef_path .. "/flow-720.mp4", Nageru.VIDEO_FORMAT_YCBCR)
+-- local iptv_video = VideoInput.new("http://10.34.129.69:9060/1/v.flv", Nageru.VIDEO_FORMAT_YCBCR)
+local iptv_video = VideoInput.new("http://home.samfundet.no/~sesse/videostuff", Nageru.VIDEO_FORMAT_YCBCR)
+
+function reload_cef()
+       cef_input:reload()
+       cef_input:execute_javascript_async("play()")
+end
+
+function disconnect_iptv()
+       iptv_video:disconnect()
+end
 
 -- Utility function to help creating many similar chains that can differ
 -- in a free set of chosen parameters.
@@ -63,7 +92,7 @@ end
 
 -- An overlay with variable alpha.
 function make_overlay(chain, base)
-       local image = chain:add_video_input(caspar_input, false)
+       local image = chain:add_html_input(cef_input)
        local multiply_effect = chain:add_effect(MultiplyEffect.new())
        local overlay_effect = chain:add_effect(OverlayEffect.new(), base, multiply_effect)
        return {
@@ -81,14 +110,17 @@ function possibly_make_overlay(has_overlay, chain, base)
        end
 end
 
-function make_fade_input(chain, signal, live, deint, scale)
+function make_fade_input(chain, signal, live, deint, scale, video)
        local input, wb_effect, resample_effect, last
-       if live then
+       if video then
+               input = chain:add_video_input(iptv_video, false)
+               last = input
+       elseif live then
                input = chain:add_live_input(false, deint)
                input:connect_signal(signal)
                last = input
        else
-               input = chain:add_effect(ImageInput.new("tfk_pause.png"))
+               input = chain:add_effect(ImageInput.new(cef_path .. "/nageru/dsn-bg.png"))
                last = input
        end
 
@@ -116,11 +148,11 @@ end
 -- A chain to fade between two inputs, of which either can be a picture
 -- or a live input. In practice only used live, but we still support the
 -- hq parameter.
-function make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, has_overlay, hq)
+function make_fade_chain(input0_live, input0_deint, input0_scale, input0_video, input1_live, input1_deint, input1_scale, input1_video, has_overlay, hq)
        local chain = EffectChain.new(16, 9)
 
-       local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale)
-       local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale)
+       local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale, input0_video)
+       local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale, input1_video)
 
        -- If fading between two live inputs, the overlay is put on top.
        -- If fading between the static picture and a live input,
@@ -156,9 +188,9 @@ end
 
 -- Chains to fade between two inputs, in various configurations.
 local fade_chains = make_cartesian_product({
-       {"static", "live", "livedeint"},  -- input0_type
+       {"video", "static", "live", "livedeint"},  -- input0_type
        {true, false},                    -- input0_scale
-       {"static", "live", "livedeint"},  -- input1_type
+       {"video", "static", "live", "livedeint"},  -- input1_type
        {true, false},                    -- input1_scale
        {true, false},                    -- has_overlay
        {true}                            -- hq
@@ -167,18 +199,91 @@ local fade_chains = make_cartesian_product({
        local input1_live = (input1_type ~= "static")
        local input0_deint = (input0_type == "livedeint")
        local input1_deint = (input1_type == "livedeint")
-       return make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, has_overlay, hq)
+       local input0_video = (input0_type == "video")
+       local input1_video = (input1_type == "video")
+       return make_fade_chain(input0_live, input0_deint, input0_scale, input0_video, input1_live, input1_deint, input1_scale, input1_video, has_overlay, hq)
+end)
+
+function make_sbs_input(chain, signal, deint, has_overlay, hq)
+       local input = chain:add_live_input(not deint, deint)  -- Override bounce only if not deinterlacing.
+       input:connect_signal(signal)
+
+       local wb_effect = chain:add_effect(WhiteBalanceEffect.new())  -- Needs to be before the overlay.
+
+       local overlay = nil
+       if has_overlay then
+               overlay = make_overlay(chain, wb_effect)
+       end
+
+       local resample_effect = nil
+       local resize_effect = nil
+       if (hq) then
+               resample_effect = chain:add_effect(ResampleEffect.new())
+       else
+               resize_effect = chain:add_effect(ResizeEffect.new())
+       end
+
+       local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
+
+       return {
+               input = input,
+               wb_effect = wb_effect,
+               resample_effect = resample_effect,
+               resize_effect = resize_effect,
+               padding_effect = padding_effect,
+               overlay = overlay
+       }
+end
+
+-- Side-by-side chains.
+function make_sbs_chain(input0_type, input0_overlay, input1_type, hq)
+       local chain = EffectChain.new(16, 9)
+
+       local bg = chain:add_video_input(bg_video, false)
+
+       local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_type == "livedeint", input0_overlay, hq)
+       local input1 = make_sbs_input(chain, INPUT4_SIGNAL_NUM, input1_type == "livedeint", false, hq)
+
+       input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
+       input1.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
+
+       local i0 = chain:add_effect(OverlayEffect.new(), bg, input0.padding_effect)
+       chain:add_effect(OverlayEffect.new(), i0, input1.padding_effect)
+       chain:finalize(hq)
+
+       return {
+               chain = chain,
+               input0 = input0,
+               input1 = input1,
+               overlay = input0.overlay  -- May be nil.
+       }
+end
+
+
+-- Make all possible combinations of side-by-side chains.
+local sbs_chains = make_cartesian_product({
+       {"live", "livedeint"},  -- input0_type
+       {true, false},          -- input0_overlay
+       {"live", "livedeint"},  -- input1_type
+       {true, false}           -- hq
+}, function(input0_type, input0_overlay, input1_type, hq)
+       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_scale, has_overlay, hq)
+function make_simple_chain(input_deint, input_video, input_scale, has_overlay, hq)
        local chain = EffectChain.new(16, 9)
 
-       local input = chain:add_live_input(false, input_deint)
-       input:connect_signal(0)  -- First input card. Can be changed whenever you want.
+       local input
+       if input_video then
+               input = chain:add_video_input(iptv_video, false)
+       else
+               input = chain:add_live_input(false, input_deint)
+               input:connect_signal(0)  -- First input card. Can be changed whenever you want.
+       end
 
        local resample_effect, resize_effect
-       if scale then
+       if input_scale then
                if hq then
                        resample_effect = chain:add_effect(ResampleEffect.new())
                else
@@ -203,21 +308,22 @@ end
 
 -- Make all possible combinations of single-input chains.
 local simple_chains = make_cartesian_product({
-       {"live", "livedeint"},  -- input_type
+       {"video", "live", "livedeint"},  -- input_type
        {true, false},          -- input_scale
        {true, false},          -- has_overlay
        {true, false}           -- hq
 }, function(input_type, input_scale, has_overlay, hq)
        local input_deint = (input_type == "livedeint")
-       return make_simple_chain(input_deint, input_scale, has_overlay, hq)
+       local input_video = (input_type == "video")
+       return make_simple_chain(input_deint, input_video, input_scale, has_overlay, hq)
 end)
 
--- A chain to show a single static picture on screen. Never with CasparCG overlay.
+-- A chain to show a single static picture on screen. Never with HTML overlay.
 local static_chains = make_cartesian_product({
        {true, false}            -- hq
 }, function(hq)
        local chain = EffectChain.new(16, 9)
-       local chain_input = chain:add_effect(ImageInput.new("tfk_pause.png"))
+       local chain_input = chain:add_effect(ImageInput.new(cef_path .. "/nageru/dsn-bg.png"))
 
        chain:finalize(hq)
        return {
@@ -228,13 +334,15 @@ end)
 -- A chain to show the overlay and nothing more. LQ only,
 -- since it is not a valid live signal.
 local overlay_chain_lq = EffectChain.new(16, 9)
-local overlay_chain_lq_input = overlay_chain_lq:add_video_input(caspar_input, false)
+local overlay_chain_lq_input = overlay_chain_lq:add_html_input(cef_input)
 overlay_chain_lq:finalize(false)
 
 -- Used for indexing into the tables of chains.
 function get_input_type(signals, signal_num)
        if signal_num == STATIC_SIGNAL_NUM then
                return "static"
+       elseif signal_num == VIDEO_SIGNAL_NUM then
+               return "video"
        elseif signals:get_interlaced(signal_num) then
                return "livedeint"
        else
@@ -265,18 +373,18 @@ end
 -- Returns the number of outputs in addition to the live (0) and preview (1).
 -- Called only once, at the start of the program.
 function num_channels()
-       return 5
+       return NUM_CAMERAS + 4  -- sbs, static picture, video and overlay
 end
 
 function is_plain_signal(num)
-       return num >= INPUT0_SIGNAL_NUM and num <= INPUT2_SIGNAL_NUM
+       return (num >= INPUT0_SIGNAL_NUM and num <= INPUT5_SIGNAL_NUM) or (num == VIDEO_SIGNAL_NUM)
 end
 
 -- Helper function to write e.g. “720p60”. The difference between this
 -- 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
@@ -320,14 +428,24 @@ end
 -- channels in case they change resolution.
 function channel_name(channel)
        local signal_num = channel - 2
-       if signal_num == 0 then
+       if signal_num == INPUT0_SIGNAL_NUM then
                return "Main (" .. get_channel_resolution(signal_num) .. ")"
-       elseif signal_num == 1 then
-               return "Goal 1 (" .. get_channel_resolution(signal_num) .. ")"
-       elseif signal_num == 2 then
-               return "Goal 2 (" .. get_channel_resolution(signal_num) .. ")"
+       elseif signal_num == INPUT1_SIGNAL_NUM then
+               return "Secondary (" .. get_channel_resolution(signal_num) .. ")"
+       elseif signal_num == INPUT2_SIGNAL_NUM then
+               return "Goal L (" .. get_channel_resolution(signal_num) .. ")"
+       elseif signal_num == INPUT3_SIGNAL_NUM then
+               return "Goal R (" .. get_channel_resolution(signal_num) .. ")"
+       elseif signal_num == INPUT4_SIGNAL_NUM then
+               return "Commentators (" .. get_channel_resolution(signal_num) .. ")"
+       elseif signal_num == INPUT5_SIGNAL_NUM then
+               return "Laptop (" .. get_channel_resolution(signal_num) .. ")"
+       elseif signal_num == SBS_SIGNAL_NUM then
+               return "Side-by-side"
        elseif signal_num == STATIC_SIGNAL_NUM then
                return "Static picture"
+       elseif signal_num == VIDEO_SIGNAL_NUM then
+               return "IPTV input"
        elseif signal_num == OVERLAY_SIGNAL_NUM then
                return "Overlay"
        end
@@ -341,10 +459,10 @@ end
 -- Called once for each channel, at the start of the program.
 -- Will never be called for live (0) or preview (1).
 function channel_signal(channel)
-       if channel == 2 then
-               return 0
-       elseif channel == 3 then
-               return 1
+       if channel - 2 == VIDEO_SIGNAL_NUM then
+               return iptv_video:get_signal_num()
+       elseif is_plain_signal(channel - 2) then
+               return channel - 2
        else
                return -1
        end
@@ -356,17 +474,17 @@ 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"
@@ -376,8 +494,14 @@ function channel_involved_in(channel, signal_num)
        if is_plain_signal(signal_num) then
                return channel == (signal_num + 2)
        end
+       if signal_num == SBS_SIGNAL_NUM then
+               return is_sbs_participating_signal(channel - 2)
+       end
        if signal_num == STATIC_SIGNAL_NUM then
-               return (channel == 5)
+               return (channel == NUM_CAMERAS)
+       end
+       if signal_num == VIDEO_SIGNAL_NUM then
+               return (channel == NUM_CAMERAS + 1)
        end
        return false
 end
@@ -394,36 +518,45 @@ 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)
+       return signal_num == INPUT0_SIGNAL_NUM or signal_num == INPUT4_SIGNAL_NUM
+end
+
+function simple_signal_has_overlay(signal_num)
+       -- The commentator output has no overlay on it.
+       return signal_num ~= INPUT4_SIGNAL_NUM
 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"}
@@ -436,63 +569,70 @@ 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) 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 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(state.live_signal_num) and state.preview_signal_num == SBS_SIGNAL_NUM then
+               return {"Cut", "Zoom out"}
+       end
+
        return {"Cut"}
 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
        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
@@ -501,7 +641,7 @@ 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()
@@ -509,26 +649,31 @@ function transition_clicked(num, t)
                -- Zoom.
                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 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()
                        return
                end
+
+               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).
@@ -538,35 +683,59 @@ 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)
-                       set_neutral_color_from_signal(chain.input0.wb_effect, transition_src_signal)
+                       chain.input0.input:connect_signal(state.transition_src_signal)
+               end
+               if input0_type ~= "static" then
+                       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)
-                       set_neutral_color_from_signal(chain.input1.wb_effect, transition_dst_signal)
+                       chain.input1.input:connect_signal(state.transition_dst_signal)
+               end
+               if input1_type ~= "static" then
+                       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)
-               prepare_overlay_live(chain, t)
+
+               -- The commentator output has no overlay on it.
+               local extra_alpha_factor = 1.0
+               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(state.transition_src_signal) then
+                       extra_alpha_factor = tt
+               elseif not simple_signal_has_overlay(state.transition_dst_signal) then
+                       extra_alpha_factor = 1.0 - tt
+               end
+               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(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][state.overlay_enabled][input1_type][true]
+end
+
+local last_rate = 0.0
+
 -- API ENTRY POINT
 -- Called every frame. Get the chain for displaying at input <num>,
 -- where 0 is live, 1 is preview, 2 is the first channel to display
@@ -593,7 +762,7 @@ end
 -- if and only if num==0.
 function get_chain(num, t, width, height, signals)
        local input_resolution = {}
-       for signal_num=0,2 do
+       for signal_num=0,(NUM_CAMERAS-1) do
                local res = {
                        width = signals:get_width(signal_num),
                        height = signals:get_height(signal_num),
@@ -619,26 +788,70 @@ 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 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
+       end
+       if new_rate ~= last_rate then
+               -- Avoid waking up the video thread (which may be sleeping) if the rate is the same.
+               bg_video:change_rate(new_rate)
+               last_rate = new_rate
+       end
+
        if num == 0 then  -- Live.
                -- See if we're in a transition.
                finish_transitions(t)
-               if 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 chain = simple_chains[input_type][input_scale][overlay_enabled][true]
-                       prepare = function()
-                               chain.input:connect_signal(live_signal_num)
+               if state.transition_type == ZOOM_TRANSITION then
+                       -- Transition in or out of SBS.
+                       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 state.transition_type == NO_TRANSITION and state.live_signal_num == SBS_SIGNAL_NUM then
+                       -- Static SBS view.
+                       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 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 = simple_chains[input_type][input_scale][overlay_really_enabled][true]
+                       local prepare = function()
+                               if input_type ~= "video" then
+                                       chain.input:connect_signal(state.live_signal_num)
+                               end
+                               set_neutral_color_from_signal(state_copy, chain.wb_effect, state.live_signal_num)
                                set_scale_parameters_if_needed(chain, width, height)
-                               set_neutral_color_from_signal(chain.wb_effect, live_signal_num)
-                               prepare_overlay_live(chain, t)
+                               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)
+                       local prepare = function()
+                               prepare_overlay_live(state_copy, chain, t, 1.0)  -- FIXME: Should this ever be here?
                        end
                        return chain.chain, prepare
                else
@@ -650,16 +863,16 @@ 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
+                       num = state.preview_signal_num + 2
+                       show_overlay = state.overlay_enabled and simple_signal_has_overlay(state.preview_signal_num)
                end
        end
 
@@ -669,23 +882,34 @@ 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()
-                       chain.input:connect_signal(signal_num)
+               local prepare = function()
+                       if input_type ~= "video" then
+                               chain.input:connect_signal(signal_num)
+                       end
+                       set_neutral_color(chain.wb_effect, state_copy.neutral_colors[signal_num + 1])
                        set_scale_parameters_if_needed(chain, width, height)
-                       set_neutral_color(chain.wb_effect, neutral_colors[signal_num + 1])
                        prepare_overlay_static(chain, t)
                end
                return chain.chain, prepare
        end
+       if num == SBS_SIGNAL_NUM + 2 then
+               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]
+               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
@@ -697,13 +921,189 @@ function round(x)
        return math.floor(x + 0.5)
 end
 
-function prepare_overlay_live(chain, t)
+function lerp(a, b, t)
+       return a + (b - a) * t
+end
+
+function lerp_pos(a, b, t)
+       return {
+               x0 = lerp(a.x0, b.x0, t),
+               y0 = lerp(a.y0, b.y0, t),
+               x1 = lerp(a.x1, b.x1, t),
+               y1 = lerp(a.y1, b.y1, t)
+       }
+end
+
+function pos_from_top_left(x, y, width, height, screen_width, screen_height)
+       local xs = screen_width / 1280.0
+       local ys = screen_height / 720.0
+       return {
+               x0 = round(xs * x),
+               y0 = round(ys * y),
+               x1 = round(xs * (x + width)),
+               y1 = round(ys * (y + height))
+       }
+end
+
+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, 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)
+       local pos1 = pos_from_top_left(16, 186, 616, 347, screen_width, screen_height)
+
+       local pos_fs = { x0 = 0, y0 = 0, x1 = screen_width, y1 = screen_height }
+       local affine_param
+       if transition_type == NO_TRANSITION then
+               -- Static SBS view.
+               affine_param = { sx = 1.0, sy = 1.0, tx = 0.0, ty = 0.0 }   -- Identity.
+       else
+               -- Zooming to/from SBS view into or out of a single view.
+               assert(transition_type == ZOOM_TRANSITION)
+               local signal, real_t
+               if src_signal == SBS_SIGNAL_NUM then
+                       signal = dst_signal
+                       real_t = t
+               else
+                       assert(dst_signal == SBS_SIGNAL_NUM)
+                       signal = src_signal
+                       real_t = 1.0 - t
+               end
+
+               if signal == INPUT0_SIGNAL_NUM then
+                       affine_param = find_affine_param(pos0, lerp_pos(pos0, pos_fs, real_t))
+               elseif signal == INPUT4_SIGNAL_NUM then
+                       affine_param = find_affine_param(pos1, lerp_pos(pos1, pos_fs, real_t))
+               end
+       end
+
+       -- NOTE: input_resolution is not 1-indexed, unlike usual Lua arrays.
+       place_rectangle_with_affine(chain.input0.resample_effect, chain.input0.resize_effect, chain.input0.padding_effect, pos0, affine_param, screen_width, screen_height, input_resolution[0].width, input_resolution[0].height)
+       place_rectangle_with_affine(chain.input1.resample_effect, chain.input1.resize_effect, chain.input1.padding_effect, pos1, affine_param, screen_width, screen_height, input_resolution[1].width, input_resolution[1].height)
+end
+
+-- Find the transformation that changes the first rectangle to the second one.
+function find_affine_param(a, b)
+       local sx = (b.x1 - b.x0) / (a.x1 - a.x0)
+       local sy = (b.y1 - b.y0) / (a.y1 - a.y0)
+       return {
+               sx = sx,
+               sy = sy,
+               tx = b.x0 - a.x0 * sx,
+               ty = b.y0 - a.y0 * sy
+       }
+end
+
+function place_rectangle_with_affine(resample_effect, resize_effect, padding_effect, pos, aff, screen_width, screen_height, input_width, input_height)
+       local x0 = pos.x0 * aff.sx + aff.tx
+       local x1 = pos.x1 * aff.sx + aff.tx
+       local y0 = pos.y0 * aff.sy + aff.ty
+       local y1 = pos.y1 * aff.sy + aff.ty
+
+       place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
+end
+
+function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
+       local srcx0 = 0.0
+       local srcx1 = 1.0
+       local srcy0 = 0.0
+       local srcy1 = 1.0
+
+       padding_effect:set_int("width", screen_width)
+       padding_effect:set_int("height", screen_height)
+
+       -- Cull.
+       if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 then
+               if resample_effect ~= nil then
+                       resample_effect:set_int("width", 1)
+                       resample_effect:set_int("height", 1)
+                       resample_effect:set_float("zoom_x", screen_width)
+                       resample_effect:set_float("zoom_y", screen_height)
+               else
+                       resize_effect:set_int("width", 1)
+                       resize_effect:set_int("height", 1)
+               end
+               padding_effect:set_int("left", screen_width + 100)
+               padding_effect:set_int("top", screen_height + 100)
+               return
+       end
+
+       -- Clip.
+       if x0 < 0 then
+               srcx0 = -x0 / (x1 - x0)
+               x0 = 0
+       end
+       if y0 < 0 then
+               srcy0 = -y0 / (y1 - y0)
+               y0 = 0
+       end
+       if x1 > screen_width then
+               srcx1 = (screen_width - x0) / (x1 - x0)
+               x1 = screen_width
+       end
+       if y1 > screen_height then
+               srcy1 = (screen_height - y0) / (y1 - y0)
+               y1 = screen_height
+       end
+
+       if resample_effect ~= nil then
+               -- High-quality resampling.
+               local x_subpixel_offset = x0 - math.floor(x0)
+               local y_subpixel_offset = y0 - math.floor(y0)
+
+               -- Resampling must be to an integral number of pixels. Round up,
+               -- and then add an extra pixel so we have some leeway for the border.
+               local width = math.ceil(x1 - x0) + 1
+               local height = math.ceil(y1 - y0) + 1
+               resample_effect:set_int("width", width)
+               resample_effect:set_int("height", height)
+
+               -- Correct the discrepancy with zoom. (This will leave a small
+               -- excess edge of pixels and subpixels, which we'll correct for soon.)
+               local zoom_x = (x1 - x0) / (width * (srcx1 - srcx0))
+               local zoom_y = (y1 - y0) / (height * (srcy1 - srcy0))
+               resample_effect:set_float("zoom_x", zoom_x)
+               resample_effect:set_float("zoom_y", zoom_y)
+               resample_effect:set_float("zoom_center_x", 0.0)
+               resample_effect:set_float("zoom_center_y", 0.0)
+
+               -- Padding must also be to a whole-pixel offset.
+               padding_effect:set_int("left", math.floor(x0))
+               padding_effect:set_int("top", math.floor(y0))
+
+               -- Correct _that_ discrepancy by subpixel offset in the resampling.
+               resample_effect:set_float("left", srcx0 * input_width - x_subpixel_offset / zoom_x)
+               resample_effect:set_float("top", srcy0 * input_height - y_subpixel_offset / zoom_y)
+
+               -- Finally, adjust the border so it is exactly where we want it.
+               padding_effect:set_float("border_offset_left", x_subpixel_offset)
+               padding_effect:set_float("border_offset_right", x1 - (math.floor(x0) + width))
+               padding_effect:set_float("border_offset_top", y_subpixel_offset)
+               padding_effect:set_float("border_offset_bottom", y1 - (math.floor(y0) + height))
+       else
+               -- Lower-quality simple resizing.
+               local width = round(x1 - x0)
+               local height = round(y1 - y0)
+               resize_effect:set_int("width", width)
+               resize_effect:set_int("height", height)
+
+               -- Padding must also be to a whole-pixel offset.
+               padding_effect:set_int("left", math.floor(x0))
+               padding_effect:set_int("top", math.floor(y0))
+       end
+end
+
+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)
-               --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.
+               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 .. " [" .. 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)
@@ -720,19 +1120,19 @@ 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
@@ -753,3 +1153,8 @@ function calc_fade_progress(t, transition_start, transition_end)
 
        return tt
 end
+
+ThemeMenu.set(
+       { "Reload overlay", reload_cef },
+       { "Disconnect IPTV", disconnect_iptv }
+)