1 -- The theme is what decides what's actually shown on screen, what kind of
2 -- transitions are available (if any), and what kind of inputs there are,
3 -- if any. In general, it drives the entire display logic by creating Movit
4 -- chains, setting their parameters and then deciding which to show when.
6 -- Themes are written in Lua, which reflects a simplified form of the Movit API
7 -- where all the low-level details (such as texture formats) are handled by the
8 -- C++ side and you generally just build chains.
9 io.write("hello from lua\n");
11 -- A chain to show input 0 on screen.
12 local input0_chain = EffectChain.new(16, 9);
13 --input0_chain:add_input(Inputs.create(0)); -- TODO: We probably want something more fluid.
14 local preview_input0 = input0_chain:add_live_input();
15 preview_input0:connect_signal(0); -- First input card. Can be changed whenever you want.
16 input0_chain:finalize(false);
18 -- The main live chain. Currently just about input 0 with some color correction.
19 local main_chain = EffectChain.new(16, 9);
20 -- local input0 = main_chain:add_input(Inputs.create(0));
21 local input0 = main_chain:add_live_input();
22 input0:connect_signal(0);
23 local wb_effect = main_chain:add_effect(WhiteBalanceEffect.new(), input0);
24 wb_effect:set_float("output_color_temperature", 1234.0);
25 main_chain:finalize(true);
26 -- local input1 = main_chain.add_input(Inputs.create(1));
27 -- local resample_effect = main_chain.add_effect(ResampleEffect.new(), input0);
28 -- local padding_effect = main_chain.add_effect(IntegralPaddingEffect.new());
30 -- Returns the number of outputs in addition to the live (0) and preview (1).
31 -- Called only once, at the start of the program.
32 function num_channels()
36 -- Called every frame.
37 function get_transitions()
38 return {"Cut", "Fade", "Zoom!"};
41 function transition_clicked(num, t)
42 -- Presumably do some sort of transition here.
43 io.write("STUB: transition_clicked\n");
46 function channel_clicked(num, t)
47 -- Presumably change the preview here.
48 io.write("STUB: channel_clicked\n");
51 -- Called every frame. Get the chain for displaying at input <num>,
52 -- where 0 is live, 1 is preview, 2 is the first channel to display
53 -- in the bottom bar, and so on up to num_channels()+1. t is the
54 -- current time in seconds. width and height are the dimensions of
55 -- the output, although you can ignore them if you don't need them
56 -- (they're useful if you want to e.g. know what to resample by).
57 -- If you want to change any parameters in the chain, this is also
60 -- NOTE: The chain returned must be finalized with the Y'CbCr flag
61 -- if and only if num==0.
62 function get_chain(num, t, width, height)
65 -- io.write("prepare is being called back\n");
66 input0:connect_signal(1);
67 wb_effect:set_float("output_color_temperature", 3500.0 + t * 100.0);
69 return main_chain, prepare;
74 return input0_chain, prepare;