-- C++ side and you generally just build chains.
io.write("hello from lua\n")
-local zoom_start = -2.0
-local zoom_end = -1.0
+local transition_start = -2.0
+local transition_end = -1.0
local zoom_src = 0.0
local zoom_dst = 1.0
+local fade_src = 0.0
+local fade_dst = 1.0
local live_signal_num = 0
local preview_signal_num = 1
local main_chain_hq = make_sbs_chain(true)
local main_chain_lq = make_sbs_chain(false)
+-- A chain to fade between two inputs (live chain only)
+local fade_chain_hq = EffectChain.new(16, 9)
+local fade_chain_hq_input0 = fade_chain_hq:add_live_input()
+local fade_chain_hq_input1 = fade_chain_hq:add_live_input()
+fade_chain_hq_input0:connect_signal(0)
+fade_chain_hq_input1:connect_signal(1)
+local fade_chain_mix_effect = fade_chain_hq:add_effect(MixEffect.new(), fade_chain_hq_input0, fade_chain_hq_input1)
+fade_chain_hq:finalize(true)
+
-- A chain to show a single input on screen (HQ version).
local simple_chain_hq = EffectChain.new(16, 9)
local simple_chain_hq_input = simple_chain_hq:add_live_input()
-simple_chain_hq_input:connect_signal(0); -- First input card. Can be changed whenever you want.
+simple_chain_hq_input:connect_signal(0) -- First input card. Can be changed whenever you want.
simple_chain_hq:finalize(true)
-- A chain to show a single input on screen (LQ version).
local simple_chain_lq = EffectChain.new(16, 9)
local simple_chain_lq_input = simple_chain_lq:add_live_input()
-simple_chain_lq_input:connect_signal(0); -- First input card. Can be changed whenever you want.
+simple_chain_lq_input:connect_signal(0) -- First input card. Can be changed whenever you want.
simple_chain_lq:finalize(false)
-- Returns the number of outputs in addition to the live (0) and preview (1).
return 3
end
+function finish_transitions(t)
+ -- If live is 2 (SBS) but de-facto single, make it so.
+ if live_signal_num == 2 and t >= transition_end and zoom_dst == 1.0 then
+ live_signal_num = 0
+ end
+
+ -- If live is 3 (fade) but de-facto single, make it so.
+ if live_signal_num == 3 and t >= transition_end and fade_dst == 1.0 then
+ live_signal_num = 0
+ end
+ if live_signal_num == 3 and t >= transition_end and fade_dst == 0.0 then
+ live_signal_num = 1
+ end
+end
+
-- Called every frame.
-function get_transitions()
- return {"Cut", "Fade", "Zoom!"}
+function get_transitions(t)
+ finish_transitions(t)
+
+ if live_signal_num == preview_signal_num then
+ return {}
+ end
+
+ if live_signal_num == 2 and t >= transition_start and t <= transition_end then
+ -- Zoom in progress.
+ return {"Cut"}
+ end
+
+ if (live_signal_num == 0 and preview_signal_num == 1) or
+ (live_signal_num == 1 and preview_signal_num == 0) then
+ return {"Cut", "", "Fade"}
+ end
+
+ if live_signal_num == 2 and preview_signal_num == 1 then
+ -- Zoom-out not supported here yet.
+ return {"Cut"}
+ end
+
+ if live_signal_num == 2 and preview_signal_num == 0 then
+ return {"Cut", "Zoom in"}
+ elseif live_signal_num == 0 and preview_signal_num == 2 then
+ return {"Cut", "Zoom out"}
+ end
+
+ return {"Cut"}
end
function transition_clicked(num, t)
- -- local temp = live_signal_num
- -- live_signal_num = preview_signal_num
- -- preview_signal_num = temp
+ if num == 0 then
+ -- Cut.
+ if live_signal_num == 3 then
+ -- Ongoing fade; finish it immediately.
+ finish_transitions(transition_end)
+ end
+
+ local temp = live_signal_num
+ live_signal_num = preview_signal_num
+ preview_signal_num = temp
+
+ if live_signal_num == 2 then
+ -- Just cut to SBS, we need to reset any zooms.
+ zoom_src = 1.0
+ zoom_dst = 0.0
+ transition_start = -2.0
+ transition_end = -1.0
+ end
+ elseif num == 1 then
+ -- Zoom.
- zoom_start = t
- zoom_end = t + 1.0
+ finish_transitions(t)
- local temp = zoom_src
- zoom_src = zoom_dst
- zoom_dst = temp
+ if live_signal_num == preview_signal_num then
+ -- Nothing to do.
+ return
+ end
+
+ if (live_signal_num == 0 and preview_signal_num == 1) or
+ (live_signal_num == 1 and preview_signal_num == 0) then
+ -- We can't zoom between these. Just make a cut.
+ io.write("Cutting from " .. live_signal_num .. " to " .. live_signal_num .. "\n")
+ local temp = live_signal_num
+ live_signal_num = preview_signal_num
+ preview_signal_num = temp
+ return
+ end
+
+ if live_signal_num == 2 and preview_signal_num == 1 then
+ io.write("NOT SUPPORTED YET\n")
+ return
+ end
+
+ if live_signal_num == 2 and preview_signal_num == 0 then
+ -- Zoom in from SBS to single.
+ transition_start = t
+ transition_end = t + 1.0
+ zoom_src = 0.0
+ zoom_dst = 1.0
+ preview_signal_num = 2
+ elseif live_signal_num == 0 and preview_signal_num == 2 then
+ -- Zoom out from single to SBS.
+ transition_start = t
+ transition_end = t + 1.0
+ zoom_src = 1.0
+ zoom_dst = 0.0
+ preview_signal_num = 0
+ live_signal_num = 2
+ end
+ elseif num == 2 then
+ finish_transitions(t)
+
+ -- Fade.
+ if live_signal_num == 0 and preview_signal_num == 1 then
+ transition_start = t
+ transition_end = t + 1.0
+ fade_src = 1.0
+ fade_dst = 0.0
+ preview_signal_num = 0
+ live_signal_num = 3
+ elseif live_signal_num == 1 and preview_signal_num == 0 then
+ transition_start = t
+ transition_end = t + 1.0
+ fade_src = 0.0
+ fade_dst = 1.0
+ preview_signal_num = 1
+ live_signal_num = 3
+ else
+ -- Fades involving SBS are ignored (we have no chain for it).
+ end
+ end
end
-function channel_clicked(num, t)
- -- Presumably change the preview here.
- io.write("STUB: channel_clicked\n")
+function channel_clicked(num)
+ preview_signal_num = num
end
-- 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
--- in the bottom bar, and so on up to num_channels()+1. t is the
+-- in the bottom bar, and so on up to num_channels()+1. t is the
-- current time in seconds. width and height are the dimensions of
-- the output, although you can ignore them if you don't need them
-- (they're useful if you want to e.g. know what to resample by).
-- if and only if num==0.
function get_chain(num, t, width, height)
if num == 0 then -- Live.
- if t > zoom_end and zoom_dst == 1.0 then
- -- Special case: Show only the single image on screen.
+ if live_signal_num == 0 or live_signal_num == 1 then -- Plain inputs.
prepare = function()
simple_chain_hq_input:connect_signal(live_signal_num)
end
return simple_chain_hq, prepare
+ elseif live_signal_num == 3 then -- Fade.
+ prepare = function()
+ fade_chain_hq_input0:connect_signal(0)
+ fade_chain_hq_input1:connect_signal(1)
+ local tt = (t - transition_start) / (transition_end - transition_start)
+ if tt < 0.0 then
+ tt = 0.0
+ elseif tt > 1.0 then
+ tt = 1.0
+ end
+
+ tt = fade_src + tt * (fade_dst - fade_src)
+
+ fade_chain_mix_effect:set_float("strength_first", tt)
+ fade_chain_mix_effect:set_float("strength_second", 1.0 - tt)
+ end
+ return fade_chain_hq, prepare
+ end
+
+ -- SBS code (live_signal_num == 2).
+ if t > transition_end and zoom_dst == 1.0 then
+ -- Special case: Show only the single image on screen.
+ prepare = function()
+ simple_chain_hq_input:connect_signal(0)
+ end
+ return simple_chain_hq, prepare
end
prepare = function()
- if t < zoom_start then
+ if t < transition_start then
prepare_sbs_chain(main_chain_hq, zoom_src, width, height)
- elseif t > zoom_end then
+ elseif t > transition_end then
prepare_sbs_chain(main_chain_hq, zoom_dst, width, height)
else
- local tt = (t - zoom_start) / (zoom_end - zoom_start)
+ local tt = (t - transition_start) / (transition_end - transition_start)
-- Smooth it a bit.
tt = math.sin(tt * 3.14159265358 * 0.5)
prepare_sbs_chain(main_chain_hq, zoom_src + (zoom_dst - zoom_src) * tt, width, height)
return main_chain_hq.chain, prepare
end
if num == 1 then -- Preview.
- prepare = function()
- simple_chain_lq_input:connect_signal(preview_signal_num)
- end
- return simple_chain_lq, prepare
+ num = preview_signal_num + 2
end
if num == 2 then
prepare = function()
end
function prepare_sbs_chain(chain, t, screen_width, screen_height)
- chain.input0.input:connect_signal(live_signal_num)
+ chain.input0.input:connect_signal(0)
chain.input1.input:connect_signal(1)
-- First input is positioned (16,48) from top-left.