git.sesse.net Git - ultimatescore/blob - nageru/ultimate.lua

   1 -- Nageru theme for TFK mini-tournament 2017, based on the default theme.
   2
   3 local http_request = require("http.request")
   4 local cqueues = require("cqueues")
   5 local cq = cqueues.new()
   6 local futatabi_server = "http://gruessi.trd.sesse.net:9095"
   7
   8 local state = {
   9         transition_start = -2.0,
  10         transition_end = -1.0,
  11         transition_type = 0,
  12         transition_src_signal = 0,
  13         transition_dst_signal = 0,
  14
  15         neutral_colors = {
  16                 {0.5, 0.5, 0.5},  -- Input 0.
  17                 {0.5, 0.5, 0.5},  -- Input 1.
  18                 {0.5, 0.5, 0.5},  -- Input 2.
  19                 {0.5, 0.5, 0.5},  -- Input 3.
  20                 {0.5, 0.5, 0.5},  -- Input 4.
  21                 {0.5, 0.5, 0.5}   -- Input 5.
  22                 -- Will also be filled with VIDEO_SIGNAL_NUM below.
  23         },
  24
  25         overlay_transition_start = -2.0,
  26         overlay_transition_end = -1.0,
  27         overlay_alpha_src = 0.0,
  28         overlay_alpha_dst = 1.0,
  29         overlay_enabled = false,
  30
  31         stinger_in_progress = false,
  32         stinger_frame = 0,
  33         stinger_src_signal = 0,
  34         stinger_dst_signal = 0,
  35         stinger_save_overlay = false,
  36
  37         live_signal_num = 0,
  38         preview_signal_num = 1
  39 }
  40 local NUM_CAMERAS = 6  -- Remember to update neutral_colors, too.
  41
  42 -- Update the Futatabi status in the title.
  43 replay_title = "IPTV"
  44 cq:wrap(function()
  45         while true do
  46                 local headers, stream = assert(http_request.new_from_uri(futatabi_server .. "/queue_status"):go())
  47                 if headers:get(":status") == "200" then
  48                         local body = stream:get_body_as_string()
  49                         if body then
  50                                 replay_title = "IPTV (" .. body .. ")"
  51                         else
  52                                 replay_title = "IPTV"
  53                                 print(futatabi_server .. ": Empty body on HTTP request")
  54                         end
  55                 else
  56                         replay_title = "IPTV"
  57                         print(futatabi_server .. ": HTTP error " .. headers:get(":status"))
  58                 end
  59         end
  60 end)
  61
  62 -- Valid values for live_signal_num and preview_signal_num.
  63 local INPUT0_SIGNAL_NUM = 0
  64 local INPUT1_SIGNAL_NUM = 1
  65 local INPUT2_SIGNAL_NUM = 2
  66 local INPUT3_SIGNAL_NUM = 3
  67 local INPUT4_SIGNAL_NUM = 4
  68 local INPUT5_SIGNAL_NUM = 5
  69 local SBS_SIGNAL_NUM = NUM_CAMERAS
  70 local STATIC_SIGNAL_NUM = NUM_CAMERAS + 1
  71 local VIDEO_SIGNAL_NUM = NUM_CAMERAS + 2
  72
  73 state.neutral_colors[VIDEO_SIGNAL_NUM - INPUT0_SIGNAL_NUM + 1] = {0.5, 0.5, 0.5}
  74
  75 -- Preview-only signal showing the current signal with the overlay.
  76 -- Not valid for live_signal_num!
  77 local OVERLAY_SIGNAL_NUM = NUM_CAMERAS + 3
  78
  79 -- Valid values for transition_type. (Cuts are done directly, so they need no entry.)
  80 local NO_TRANSITION = 0
  81 local ZOOM_TRANSITION = 1
  82 local FADE_TRANSITION = 2
  83
  84 -- Last width/height/frame rate for each channel, if we have it.
  85 -- Note that unlike the values we get from Nageru, the resolution is per
  86 -- frame and not per field, since we deinterlace.
  87 local last_resolution = {}
  88
  89 local cef_path = Nageru.THEME_PATH:match("(.*)/nageru/")
  90 local cef_input = HTMLInput.new("file://" .. cef_path .. "/score.html")
  91 cef_input:execute_javascript_async("play()")
  92
  93 local bg_video = VideoInput.new(cef_path .. "/flow-720.mp4", Nageru.VIDEO_FORMAT_YCBCR)
  94 -- local iptv_video = VideoInput.new("http://10.34.129.69:9060/1/v.flv", Nageru.VIDEO_FORMAT_YCBCR)
  95 local iptv_video = VideoInput.new(futatabi_server, Nageru.VIDEO_FORMAT_YCBCR)
  96
  97 function reload_cef()
  98         cef_input:reload()
  99         cef_input:execute_javascript_async("play()")
 100 end
 101
 102 function disconnect_iptv()
 103         iptv_video:disconnect()
 104 end
 105
 106 -- Utility function to help creating many similar chains that can differ
 107 -- in a free set of chosen parameters.
 108 function make_cartesian_product(parms, callback)
 109         return make_cartesian_product_internal(parms, callback, 1, {})
 110 end
 111
 112 function make_cartesian_product_internal(parms, callback, index, args)
 113         if index > #parms then
 114                 return callback(unpack(args))
 115         end
 116         local ret = {}
 117         for _, value in ipairs(parms[index]) do
 118                 args[index] = value
 119                 ret[value] = make_cartesian_product_internal(parms, callback, index + 1, args)
 120         end
 121         return ret
 122 end
 123
 124 -- An overlay with variable alpha.
 125 function make_overlay(chain, base)
 126         local image = chain:add_html_input(cef_input)
 127         local multiply_effect = chain:add_effect(MultiplyEffect.new())
 128         local overlay_effect = chain:add_effect(OverlayEffect.new(), base, multiply_effect)
 129         return {
 130                 image = image,
 131                 multiply_effect = multiply_effect,
 132                 overlay_effect = overlay_effect
 133         }
 134 end
 135
 136 function possibly_make_overlay(has_overlay, chain, base)
 137         if has_overlay == true then
 138                 return make_overlay(chain, base)
 139         else
 140                 return nil
 141         end
 142 end
 143
 144 function make_fade_input(chain, signal, live, deint, scale, video)
 145         local input, wb_effect, resample_effect, last
 146         if video then
 147                 input = chain:add_video_input(iptv_video, false)
 148                 last = input
 149         elseif live then
 150                 input = chain:add_live_input(false, deint)
 151                 input:connect_signal(signal)
 152                 last = input
 153         else
 154                 input = chain:add_effect(ImageInput.new(cef_path .. "/nageru/dsn-bg.png"))
 155                 last = input
 156         end
 157
 158         -- If we cared about this for the non-main inputs, we would have
 159         -- checked hq here and invoked ResizeEffect instead.
 160         if scale then
 161                 resample_effect = chain:add_effect(ResampleEffect.new())
 162                 last = resample_effect
 163         end
 164
 165         -- Make sure to put the white balance after the scaling (usually more efficient).
 166         if live then
 167                 wb_effect = chain:add_effect(WhiteBalanceEffect.new())
 168                 last = wb_effect
 169         end
 170
 171         return {
 172                 input = input,
 173                 wb_effect = wb_effect,
 174                 resample_effect = resample_effect,
 175                 last = last
 176         }
 177 end
 178
 179 -- A chain to fade between two inputs, of which either can be a picture
 180 -- or a live input. In practice only used live, but we still support the
 181 -- hq parameter.
 182 function make_fade_chain(input0_live, input0_deint, input0_scale, input0_video, input1_live, input1_deint, input1_scale, input1_video, has_overlay, hq)
 183         local chain = EffectChain.new(16, 9)
 184
 185         local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale, input0_video)
 186         local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale, input1_video)
 187
 188         -- If fading between two live inputs, the overlay is put on top.
 189         -- If fading between the static picture and a live input,
 190         -- the overlay is put on the live input.
 191         local overlay = nil
 192         if input0_live and not input1_live then
 193                 overlay = possibly_make_overlay(has_overlay, chain, input0.last)
 194                 if overlay then
 195                         input0.last = overlay.overlay_effect
 196                 end
 197         elseif input1_live and not input0_live then
 198                 overlay = possibly_make_overlay(has_overlay, chain, input1.last)
 199                 if overlay then
 200                         input1.last = overlay.overlay_effect
 201                 end
 202         end
 203
 204         local mix_effect = chain:add_effect(MixEffect.new(), input0.last, input1.last)
 205         if input0_live and input1_live then
 206                 overlay = possibly_make_overlay(has_overlay, chain, mix_effect)
 207         end
 208
 209         chain:finalize(hq)
 210
 211         return {
 212                 chain = chain,
 213                 input0 = input0,
 214                 input1 = input1,
 215                 mix_effect = mix_effect,
 216                 overlay = overlay
 217         }
 218 end
 219
 220 -- Chains to fade between two inputs, in various configurations.
 221 local fade_chains = make_cartesian_product({
 222         {"video", "static", "live", "livedeint"},  -- input0_type
 223         {true, false},                    -- input0_scale
 224         {"video", "static", "live", "livedeint"},  -- input1_type
 225         {true, false},                    -- input1_scale
 226         {true, false},                    -- has_overlay
 227         {true}                            -- hq
 228 }, function(input0_type, input0_scale, input1_type, input1_scale, has_overlay, hq)
 229         local input0_live = (input0_type ~= "static")
 230         local input1_live = (input1_type ~= "static")
 231         local input0_deint = (input0_type == "livedeint")
 232         local input1_deint = (input1_type == "livedeint")
 233         local input0_video = (input0_type == "video")
 234         local input1_video = (input1_type == "video")
 235         return make_fade_chain(input0_live, input0_deint, input0_scale, input0_video, input1_live, input1_deint, input1_scale, input1_video, has_overlay, hq)
 236 end)
 237
 238 function make_sbs_input(chain, signal, deint, has_overlay, hq)
 239         local input = chain:add_live_input(not deint, deint)  -- Override bounce only if not deinterlacing.
 240         input:connect_signal(signal)
 241
 242         local wb_effect = chain:add_effect(WhiteBalanceEffect.new())  -- Needs to be before the overlay.
 243
 244         local overlay = nil
 245         if has_overlay then
 246                 overlay = make_overlay(chain, wb_effect)
 247         end
 248
 249         local resample_effect = nil
 250         local resize_effect = nil
 251         if (hq) then
 252                 resample_effect = chain:add_effect(ResampleEffect.new())
 253         else
 254                 resize_effect = chain:add_effect(ResizeEffect.new())
 255         end
 256
 257         local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
 258
 259         return {
 260                 input = input,
 261                 wb_effect = wb_effect,
 262                 resample_effect = resample_effect,
 263                 resize_effect = resize_effect,
 264                 padding_effect = padding_effect,
 265                 overlay = overlay
 266         }
 267 end
 268
 269 -- Side-by-side chains.
 270 function make_sbs_chain(input0_type, input0_overlay, input1_type, hq)
 271         local chain = EffectChain.new(16, 9)
 272
 273         local bg = chain:add_video_input(bg_video, false)
 274
 275         local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_type == "livedeint", input0_overlay, hq)
 276         local input1 = make_sbs_input(chain, INPUT4_SIGNAL_NUM, input1_type == "livedeint", false, hq)
 277
 278         input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
 279         input1.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
 280
 281         local i0 = chain:add_effect(OverlayEffect.new(), bg, input0.padding_effect)
 282         chain:add_effect(OverlayEffect.new(), i0, input1.padding_effect)
 283         chain:finalize(hq)
 284
 285         return {
 286                 chain = chain,
 287                 input0 = input0,
 288                 input1 = input1,
 289                 overlay = input0.overlay  -- May be nil.
 290         }
 291 end
 292
 293
 294 -- Make all possible combinations of side-by-side chains.
 295 local sbs_chains = make_cartesian_product({
 296         {"live", "livedeint"},  -- input0_type
 297         {true, false},          -- input0_overlay
 298         {"live", "livedeint"},  -- input1_type
 299         {true, false}           -- hq
 300 }, function(input0_type, input0_overlay, input1_type, hq)
 301         return make_sbs_chain(input0_type, input0_overlay, input1_type, hq)
 302 end)
 303
 304 function make_simple_chain_no_finalize(input_deint, input_video, input_scale, has_overlay, hq)
 305         local chain = EffectChain.new(16, 9)
 306
 307         local input
 308         if input_video then
 309                 input = chain:add_video_input(iptv_video, false)
 310         else
 311                 input = chain:add_live_input(false, input_deint)
 312                 input:connect_signal(0)  -- First input card. Can be changed whenever you want.
 313         end
 314
 315         local resample_effect, resize_effect
 316         if input_scale then
 317                 if hq then
 318                         resample_effect = chain:add_effect(ResampleEffect.new())
 319                 else
 320                         resize_effect = chain:add_effect(ResizeEffect.new())
 321                 end
 322         end
 323
 324         local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
 325         local overlay = possibly_make_overlay(has_overlay, chain, wb_effect)
 326
 327         return {
 328                 chain = chain,
 329                 input = input,
 330                 wb_effect = wb_effect,
 331                 resample_effect = resample_effect,
 332                 resize_effect = resize_effect,
 333                 overlay = overlay
 334         }
 335 end
 336
 337 -- A chain to show a single input on screen.
 338 function make_simple_chain(input_deint, input_video, input_scale, has_overlay, hq)
 339         local chain = make_simple_chain_no_finalize(input_deint, input_video, input_scale, has_overlay, hq)
 340         chain.chain:finalize(hq)
 341         return chain
 342 end
 343
 344 -- Make all possible combinations of single-input chains.
 345 local simple_chains = make_cartesian_product({
 346         {"video", "live", "livedeint"},  -- input_type
 347         {true, false},          -- input_scale
 348         {true, false},          -- has_overlay
 349         {true, false}           -- hq
 350 }, function(input_type, input_scale, has_overlay, hq)
 351         local input_deint = (input_type == "livedeint")
 352         local input_video = (input_type == "video")
 353         return make_simple_chain(input_deint, input_video, input_scale, has_overlay, hq)
 354 end)
 355
 356 -- A chain to show a single input on screen, with a stinger on top.
 357 function make_stinger_chain(input_deint, input_video, input_scale, has_overlay, stinger_frame, hq)
 358         local chain = make_simple_chain_no_finalize(input_deint, input_video, input_scale, has_overlay, hq)
 359         local filename = cef_path .. "/stinger/blur" .. string.rep("0", 3 - string.len(tostring(stinger_frame))) .. stinger_frame .. ".png"
 360
 361         local last
 362         if has_overlay then
 363                 last = chain.overlay.overlay_effect
 364         else
 365                 last = chain.wb_effect
 366         end
 367         local input = chain.chain:add_effect(ImageInput.new(filename))
 368         chain.chain:add_effect(OverlayEffect.new(), last, input)
 369         chain.chain:finalize(hq)
 370         return chain
 371 end
 372
 373 -- Single-input chains with various stinger frames on top.
 374 local stinger_chains = make_cartesian_product({
 375         {"video", "live", "livedeint"},  -- input_type
 376         {true, false},          -- input_scale
 377         {true, false},          -- has_overlay
 378         {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
 379         {true, false}           -- hq
 380 }, function(input_type, input_scale, has_overlay, stinger_frame, hq)
 381         local input_deint = (input_type == "livedeint")
 382         local input_video = (input_type == "video")
 383         return make_stinger_chain(input_deint, input_video, input_scale, has_overlay, stinger_frame, hq)
 384 end)
 385
 386 -- A chain to show a single static picture on screen. Never with HTML overlay.
 387 local static_chains = make_cartesian_product({
 388         {true, false}            -- hq
 389 }, function(hq)
 390         local chain = EffectChain.new(16, 9)
 391         local chain_input = chain:add_effect(ImageInput.new(cef_path .. "/nageru/dsn-bg.png"))
 392
 393         chain:finalize(hq)
 394         return {
 395                 chain = chain
 396         }
 397 end)
 398
 399 -- A chain to show the overlay and nothing more. LQ only,
 400 -- since it is not a valid live signal.
 401 local overlay_chain_lq = EffectChain.new(16, 9)
 402 local overlay_chain_lq_input = overlay_chain_lq:add_html_input(cef_input)
 403 overlay_chain_lq:finalize(false)
 404
 405 -- Used for indexing into the tables of chains.
 406 function get_input_type(signals, signal_num)
 407         if signal_num == STATIC_SIGNAL_NUM then
 408                 return "static"
 409         elseif signal_num == VIDEO_SIGNAL_NUM then
 410                 return "video"
 411         elseif signals:get_interlaced(signal_num) then
 412                 return "livedeint"
 413         else
 414                 return "live"
 415         end
 416 end
 417
 418 function needs_scale(signals, signal_num, width, height)
 419         if signal_num == STATIC_SIGNAL_NUM then
 420                 -- We assume this is already correctly scaled at load time.
 421                 return false
 422         end
 423         assert(is_plain_signal(signal_num))
 424         return (signals:get_width(signal_num) ~= width or signals:get_height(signal_num) ~= height)
 425 end
 426
 427 function set_scale_parameters_if_needed(chain_or_input, width, height)
 428         if chain_or_input.resample_effect then
 429                 chain_or_input.resample_effect:set_int("width", width)
 430                 chain_or_input.resample_effect:set_int("height", height)
 431         elseif chain_or_input.resize_effect then
 432                 chain_or_input.resize_effect:set_int("width", width)
 433                 chain_or_input.resize_effect:set_int("height", height)
 434         end
 435 end
 436
 437 -- API ENTRY POINT
 438 -- Returns the number of outputs in addition to the live (0) and preview (1).
 439 -- Called only once, at the start of the program.
 440 function num_channels()
 441         return NUM_CAMERAS + 4  -- sbs, static picture, video and overlay
 442 end
 443
 444 function is_plain_signal(num)
 445         return (num >= INPUT0_SIGNAL_NUM and num <= INPUT5_SIGNAL_NUM) or (num == VIDEO_SIGNAL_NUM)
 446 end
 447
 448 -- Helper function to write e.g. “720p60”. The difference between this
 449 -- and get_channel_resolution_raw() is that this one also can say that
 450 -- there's no signal.
 451 function get_channel_resolution(signal_num)
 452         local res = last_resolution[signal_num]
 453         if (not res) or not res.is_connected then
 454                 return "disconnected"
 455         end
 456         if res.height <= 0 then
 457                 return "no signal"
 458         end
 459         if not res.has_signal then
 460                 if res.height == 525 then
 461                         -- Special mode for the USB3 cards.
 462                         return "no signal"
 463                 end
 464                 return get_channel_resolution_raw(res) .. ", no signal"
 465         else
 466                 return get_channel_resolution_raw(res)
 467         end
 468 end
 469
 470 -- Helper function to write e.g. “60” or “59.94”.
 471 function get_frame_rate(res)
 472         local nom = res.frame_rate_nom
 473         local den = res.frame_rate_den
 474         if nom % den == 0 then
 475                 return nom / den
 476         else
 477                 return string.format("%.2f", nom / den)
 478         end
 479 end
 480
 481 -- Helper function to write e.g. “720p60”.
 482 function get_channel_resolution_raw(res)
 483         if res.interlaced then
 484                 return res.height .. "i" .. get_frame_rate(res)
 485         else
 486                 return res.height .. "p" .. get_frame_rate(res)
 487         end
 488 end
 489
 490 -- API ENTRY POINT
 491 -- Returns the name for each additional channel (starting from 2).
 492 -- Called at the start of the program, and then each frame for live
 493 -- channels in case they change resolution.
 494 function channel_name(channel)
 495         local signal_num = channel - 2
 496         if signal_num == INPUT0_SIGNAL_NUM then
 497                 return "Main (" .. get_channel_resolution(signal_num) .. ")"
 498         elseif signal_num == INPUT1_SIGNAL_NUM then
 499                 return "Secondary (" .. get_channel_resolution(signal_num) .. ")"
 500         elseif signal_num == INPUT2_SIGNAL_NUM then
 501                 return "Goal L (" .. get_channel_resolution(signal_num) .. ")"
 502         elseif signal_num == INPUT3_SIGNAL_NUM then
 503                 return "Goal R (" .. get_channel_resolution(signal_num) .. ")"
 504         elseif signal_num == INPUT4_SIGNAL_NUM then
 505                 return "Commentators (" .. get_channel_resolution(signal_num) .. ")"
 506         elseif signal_num == INPUT5_SIGNAL_NUM then
 507                 return "Laptop (" .. get_channel_resolution(signal_num) .. ")"
 508         elseif signal_num == SBS_SIGNAL_NUM then
 509                 return "Side-by-side"
 510         elseif signal_num == STATIC_SIGNAL_NUM then
 511                 return "Static picture"
 512         elseif signal_num == VIDEO_SIGNAL_NUM then
 513                 -- return "IPTV input (" .. get_channel_resolution(iptv_video:get_signal_num()) .. ")"
 514                 return replay_title
 515         elseif signal_num == OVERLAY_SIGNAL_NUM then
 516                 return "Overlay"
 517         end
 518 end
 519
 520 -- API ENTRY POINT
 521 -- Returns, given a channel number, which signal it corresponds to (starting from 0).
 522 -- Should return -1 if the channel does not correspond to a simple signal.
 523 -- (The information is used for whether right-click on the channel should bring up
 524 -- an input selector or not.)
 525 -- Called once for each channel, at the start of the program.
 526 -- Will never be called for live (0) or preview (1).
 527 function channel_signal(channel)
 528         if channel - 2 == VIDEO_SIGNAL_NUM then
 529                 return iptv_video:get_signal_num()
 530         elseif is_plain_signal(channel - 2) then
 531                 return channel - 2
 532         else
 533                 return -1
 534         end
 535 end
 536
 537 -- API ENTRY POINT
 538 -- Called every frame. Returns the color (if any) to paint around the given
 539 -- channel. Returns a CSS color (typically to mark live and preview signals);
 540 -- "transparent" is allowed.
 541 -- Will never be called for live (0) or preview (1).
 542 function channel_color(channel)
 543         if state.transition_type ~= NO_TRANSITION then
 544                 if channel_involved_in(channel, state.transition_src_signal) or
 545                    channel_involved_in(channel, state.transition_dst_signal) then
 546                         return "#f00"
 547                 end
 548         else
 549                 if channel_involved_in(channel, state.live_signal_num) then
 550                         return "#f00"
 551                 end
 552         end
 553         if channel_involved_in(channel, state.preview_signal_num) then
 554                 return "#0f0"
 555         end
 556         return "transparent"
 557 end
 558
 559 function channel_involved_in(channel, signal_num)
 560         if is_plain_signal(signal_num) then
 561                 return channel == (signal_num + 2)
 562         end
 563         if signal_num == SBS_SIGNAL_NUM then
 564                 return is_sbs_participating_signal(channel - 2)
 565         end
 566         if signal_num == STATIC_SIGNAL_NUM then
 567                 return (channel == NUM_CAMERAS)
 568         end
 569         if signal_num == VIDEO_SIGNAL_NUM then
 570                 return (channel == NUM_CAMERAS + 1)
 571         end
 572         return false
 573 end
 574
 575 -- API ENTRY POINT
 576 -- Returns if a given channel supports setting white balance (starting from 2).
 577 -- Called only once for each channel, at the start of the program.
 578 function supports_set_wb(channel)
 579         return is_plain_signal(channel - 2)
 580 end
 581
 582 -- API ENTRY POINT
 583 -- Gets called with a new gray point when the white balance is changing.
 584 -- The color is in linear light (not sRGB gamma).
 585 function set_wb(channel, red, green, blue)
 586         if is_plain_signal(channel - 2) then
 587                 state.neutral_colors[channel - 2 + 1] = { red, green, blue }
 588         end
 589 end
 590
 591 function finish_transitions(t)
 592         if state.transition_type ~= NO_TRANSITION and t >= state.transition_end then
 593                 state.live_signal_num = state.transition_dst_signal
 594                 state.transition_type = NO_TRANSITION
 595         end
 596
 597         -- Disable the overlay if it is no longer visible.
 598         if state.overlay_enabled and t > state.overlay_transition_end and state.overlay_alpha_dst == 0.0 then
 599                 state.overlay_enabled = false
 600                 print("Turning off overlay")
 601         end
 602 end
 603
 604 function in_transition(t)
 605         return t >= state.transition_start and t <= state.transition_end
 606 end
 607
 608 function is_sbs_participating_signal(signal_num)
 609         return signal_num == INPUT0_SIGNAL_NUM or signal_num == INPUT4_SIGNAL_NUM
 610 end
 611
 612 function simple_signal_has_overlay(signal_num)
 613         -- The commentator output has no overlay on it.
 614         return signal_num ~= INPUT4_SIGNAL_NUM
 615 end
 616
 617 -- API ENTRY POINT
 618 -- Called every frame.
 619 function get_transitions(t)
 620         if state.preview_signal_num == OVERLAY_SIGNAL_NUM then
 621                 if t < state.overlay_transition_end then
 622                         -- Fade in progress.
 623                         return {}
 624                 end
 625                 if state.overlay_enabled then
 626                         return {"Overlay off", "", "Fade ovl out"}
 627                 else
 628                         return {"Overlay on", "", "Fade ovl in"}
 629                 end
 630         end
 631
 632         if in_transition(t) then
 633                 -- Transition already in progress, the only thing we can do is really
 634                 -- cut to the preview. (TODO: Make an “abort” and/or “finish”, too?)
 635                 return {"Cut"}
 636         end
 637
 638         if state.live_signal_num == state.preview_signal_num then
 639                 -- No transitions possible.
 640                 return {}
 641         end
 642
 643         if (is_plain_signal(state.live_signal_num) and state.preview_signal_num == VIDEO_SIGNAL_NUM) or
 644            (is_plain_signal(state.preview_signal_num) and state.live_signal_num == VIDEO_SIGNAL_NUM) then
 645                 return {"Cut", "Sting", "Fade"}
 646         end
 647
 648         if (is_plain_signal(state.live_signal_num) or state.live_signal_num == STATIC_SIGNAL_NUM) and
 649            (is_plain_signal(state.preview_signal_num) or state.preview_signal_num == STATIC_SIGNAL_NUM) then
 650                 return {"Cut", "", "Fade"}
 651         end
 652
 653         -- Various zooms.
 654         if state.live_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(state.preview_signal_num) then
 655                 return {"Cut", "Zoom in"}
 656         elseif is_sbs_participating_signal(state.live_signal_num) and state.preview_signal_num == SBS_SIGNAL_NUM then
 657                 return {"Cut", "Zoom out"}
 658         end
 659
 660         return {"Cut"}
 661 end
 662
 663 function swap_preview_live()
 664         local temp = state.live_signal_num
 665         state.live_signal_num = state.preview_signal_num
 666         state.preview_signal_num = temp
 667 end
 668
 669 function start_transition(type_, t, duration)
 670         state.transition_start = t
 671         state.transition_end = t + duration
 672         state.transition_type = type_
 673         state.transition_src_signal = state.live_signal_num
 674         state.transition_dst_signal = state.preview_signal_num
 675         state.stinger_in_progress = false
 676         swap_preview_live()
 677 end
 678
 679 -- API ENTRY POINT
 680 -- Called when the user clicks a transition button.
 681 function transition_clicked(num, t)
 682         if state.preview_signal_num == OVERLAY_SIGNAL_NUM then
 683                 if num == 0 then
 684                         -- Cut.
 685                         state.overlay_transition_start = -2.0
 686                         state.overlay_transition_end = -1.0
 687                         if state.overlay_enabled then
 688                                 state.overlay_enabled = false
 689                                 state.overlay_alpha_src = 0.0
 690                                 state.overlay_alpha_dst = 0.0
 691                         else
 692                                 state.overlay_enabled = true
 693                                 state.overlay_alpha_src = 1.0
 694                                 state.overlay_alpha_dst = 1.0
 695                         end
 696                 elseif num == 2 then
 697                         -- Fade.
 698                         state.overlay_transition_start = t
 699                         state.overlay_transition_end = t + 1.0
 700                         if state.overlay_enabled then
 701                                 state.overlay_alpha_src = 1.0
 702                                 state.overlay_alpha_dst = 0.0
 703                         else
 704                                 state.overlay_alpha_src = 0.0
 705                                 state.overlay_alpha_dst = 1.0
 706                         end
 707                         state.overlay_enabled = true
 708                 end
 709                 return
 710         end
 711
 712         if num == 0 then
 713                 -- Cut.
 714                 if in_transition(t) then
 715                         -- Ongoing transition; finish it immediately before the cut.
 716                         finish_transitions(state.transition_end)
 717                 end
 718
 719                 swap_preview_live()
 720                 state.stinger_in_progress = false
 721         elseif num == 1 then
 722                 -- Zoom or sting.
 723                 finish_transitions(t)
 724
 725                 if state.live_signal_num == state.preview_signal_num then
 726                         -- Nothing to do.
 727                         return
 728                 end
 729
 730                 if (is_plain_signal(state.live_signal_num) and state.preview_signal_num == VIDEO_SIGNAL_NUM) or
 731                    (is_plain_signal(state.preview_signal_num) and state.live_signal_num == VIDEO_SIGNAL_NUM) then
 732                         -- Sting.
 733                         if stinger_in_progress then
 734                                 return
 735                         end
 736
 737                         state.stinger_in_progress = true
 738                         state.stinger_frame = 0
 739                         state.stinger_src_signal = state.live_signal_num
 740                         state.stinger_dst_signal = state.preview_signal_num
 741                         return
 742                 end
 743
 744                 if is_plain_signal(state.live_signal_num) and is_plain_signal(state.preview_signal_num) then
 745                         -- We can't zoom between these. Just make a cut.
 746                         io.write("Cutting from " .. state.live_signal_num .. " to " .. state.live_signal_num .. "\n")
 747                         swap_preview_live()
 748                         state.stinger_in_progress = false
 749                         return
 750                 end
 751
 752                 if (state.live_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(state.preview_signal_num)) or
 753                    (state.preview_signal_num == SBS_SIGNAL_NUM and is_sbs_participating_signal(state.live_signal_num)) then
 754                         start_transition(ZOOM_TRANSITION, t, 1.0)
 755                 end
 756         elseif num == 2 then
 757                 finish_transitions(t)
 758
 759                 -- Fade.
 760                 if (state.live_signal_num ~= state.preview_signal_num) and
 761                    (is_plain_signal(state.live_signal_num) or
 762                     state.live_signal_num == STATIC_SIGNAL_NUM) and
 763                    (is_plain_signal(state.preview_signal_num) or
 764                     state.preview_signal_num == STATIC_SIGNAL_NUM) then
 765                         start_transition(FADE_TRANSITION, t, 1.0)
 766                 else
 767                         -- Fades involving SBS are ignored (we have no chain for it).
 768                 end
 769         end
 770 end
 771
 772 -- API ENTRY POINT
 773 function channel_clicked(num)
 774         state.preview_signal_num = num
 775 end
 776
 777 function get_fade_chain(state, signals, t, width, height, input_resolution)
 778         local input0_type = get_input_type(signals, state.transition_src_signal)
 779         local input0_scale = needs_scale(signals, state.transition_src_signal, width, height)
 780         local input1_type = get_input_type(signals, state.transition_dst_signal)
 781         local input1_scale = needs_scale(signals, state.transition_dst_signal, width, height)
 782         local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][state.overlay_enabled][true]
 783         local prepare = function()
 784                 if input0_type == "live" or input0_type == "livedeint" then
 785                         chain.input0.input:connect_signal(state.transition_src_signal)
 786                 end
 787                 if input0_type ~= "static" then
 788                         set_neutral_color_from_signal(state, chain.input0.wb_effect, state.transition_src_signal)
 789                 end
 790                 set_scale_parameters_if_needed(chain.input0, width, height)
 791                 if input1_type == "live" or input1_type == "livedeint" then
 792                         chain.input1.input:connect_signal(state.transition_dst_signal)
 793                 end
 794                 if input1_type ~= "static" then
 795                         set_neutral_color_from_signal(state, chain.input1.wb_effect, state.transition_dst_signal)
 796                 end
 797                 set_scale_parameters_if_needed(chain.input1, width, height)
 798                 local tt = calc_fade_progress(t, state.transition_start, state.transition_end)
 799
 800                 chain.mix_effect:set_float("strength_first", 1.0 - tt)
 801                 chain.mix_effect:set_float("strength_second", tt)
 802
 803                 -- The commentator output has no overlay on it.
 804                 local extra_alpha_factor = 1.0
 805                 if not simple_signal_has_overlay(state.transition_src_signal) and
 806                    not simple_signal_has_overlay(state.transition_dst_signal) then
 807                         extra_alpha_factor = 0.0
 808                 elseif not simple_signal_has_overlay(state.transition_src_signal) then
 809                         extra_alpha_factor = tt
 810                 elseif not simple_signal_has_overlay(state.transition_dst_signal) then
 811                         extra_alpha_factor = 1.0 - tt
 812                 end
 813                 prepare_overlay_live(state, chain, t, extra_alpha_factor)
 814         end
 815         return chain.chain, prepare
 816 end
 817
 818 -- SBS code (live_signal_num == SBS_SIGNAL_NUM, or in a transition to/from it).
 819 function get_sbs_chain(state, signals)
 820         local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
 821         local input1_type = get_input_type(signals, INPUT4_SIGNAL_NUM)
 822         return sbs_chains[input0_type][state.overlay_enabled][input1_type][true]
 823 end
 824
 825 function fetch_input_resolution(signals, signal_num)
 826         local res = {
 827                 width = signals:get_width(signal_num),
 828                 height = signals:get_height(signal_num),
 829                 interlaced = signals:get_interlaced(signal_num),
 830                 has_signal = signals:get_has_signal(signal_num),
 831                 is_connected = signals:get_is_connected(signal_num),
 832                 frame_rate_nom = signals:get_frame_rate_nom(signal_num),
 833                 frame_rate_den = signals:get_frame_rate_den(signal_num)
 834         }
 835
 836         if res.interlaced then
 837                 -- Convert height from frame height to field height.
 838                 -- (Needed for e.g. place_rectangle.)
 839                 res.height = res.height * 2
 840
 841                 -- Show field rate instead of frame rate; really for cosmetics only
 842                 -- (and actually contrary to EBU recommendations, although in line
 843                 -- with typical user expectations).
 844                 res.frame_rate_nom = res.frame_rate_nom * 2
 845         end
 846         return res
 847 end
 848
 849 local last_rate = 0.0
 850
 851 -- API ENTRY POINT
 852 -- Called every frame. Get the chain for displaying at input <num>,
 853 -- where 0 is live, 1 is preview, 2 is the first channel to display
 854 -- in the bottom bar, and so on up to num_channels()+1. t is the
 855 -- current time in seconds. width and height are the dimensions of
 856 -- the output, although you can ignore them if you don't need them
 857 -- (they're useful if you want to e.g. know what to resample by).
 858 --
 859 -- <signals> is basically an exposed InputState, which you can use to
 860 -- query for information about the signals at the point of the current
 861 -- frame. In particular, you can call get_width() and get_height()
 862 -- for any signal number, and use that to e.g. assist in chain selection.
 863 --
 864 -- You should return two objects; the chain itself, and then a
 865 -- function (taking no parameters) that is run just before rendering.
 866 -- The function needs to call connect_signal on any inputs, so that
 867 -- it gets updated video data for the given frame. (You are allowed
 868 -- to switch which input your input is getting from between frames,
 869 -- but not calling connect_signal results in undefined behavior.)
 870 -- If you want to change any parameters in the chain, this is also
 871 -- the right place.
 872 --
 873 -- NOTE: The chain returned must be finalized with the Y'CbCr flag
 874 -- if and only if num==0.
 875 function get_chain(num, t, width, height, signals)
 876         cq:loop(0)
 877
 878         local input_resolution = {}
 879         for signal_num=0,(NUM_CAMERAS-1) do
 880                 input_resolution[signal_num] = fetch_input_resolution(signals, signal_num)
 881         end
 882         input_resolution[iptv_video:get_signal_num()] = fetch_input_resolution(signals, iptv_video:get_signal_num())
 883         last_resolution = input_resolution
 884
 885         -- Make a (semi-shallow) copy of the current state, so that the returned prepare function
 886         -- is unaffected by state changes made by the UI before it is rendered.
 887         local state_copy = {}
 888         for key, value in pairs(state) do
 889                 state_copy[key] = value
 890         end
 891         for key, value in pairs(state.neutral_colors) do
 892                 state_copy.neutral_colors[key] = value
 893         end
 894
 895         -- Save some CPU time if we're not having SBS on live.
 896         local new_rate
 897         if state.live_signal_num == SBS_SIGNAL_NUM or
 898            state.preview_signal_num == SBS_SIGNAL_NUM or
 899            state.transition_type == ZOOM_TRANSITION then
 900                 new_rate = 1.0
 901         else
 902                 new_rate = 0.0001
 903         end
 904         if new_rate ~= last_rate then
 905                 -- Avoid waking up the video thread (which may be sleeping) if the rate is the same.
 906                 bg_video:change_rate(new_rate)
 907                 last_rate = new_rate
 908         end
 909
 910         if num == 0 then  -- Live.
 911                 -- See if we're in a transition.
 912                 finish_transitions(t)
 913                 if state.transition_type == ZOOM_TRANSITION then
 914                         -- Transition in or out of SBS.
 915                         local chain = get_sbs_chain(state_copy, signals)
 916                         local prepare = function()
 917                                 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)
 918                                 prepare_overlay_live(state_copy, chain, t, 1.0)
 919                         end
 920                         return chain.chain, prepare
 921                 elseif state.transition_type == NO_TRANSITION and state.live_signal_num == SBS_SIGNAL_NUM then
 922                         -- Static SBS view.
 923                         local chain = get_sbs_chain(state_copy, signals)
 924                         local prepare = function()
 925                                 prepare_sbs_chain(state_copy, chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
 926                                 prepare_overlay_live(state_copy, chain, t, 1.0)
 927                         end
 928                         return chain.chain, prepare
 929                 elseif state.transition_type == FADE_TRANSITION then
 930                         return get_fade_chain(state_copy, signals, t, width, height, input_resolution)
 931                 elseif is_plain_signal(state.live_signal_num) then
 932                         local input_type = get_input_type(signals, state.live_signal_num)
 933                         local input_scale = needs_scale(signals, state.live_signal_num, width, height)
 934                         local overlay_really_enabled = state.overlay_enabled and simple_signal_has_overlay(state.live_signal_num)
 935                         local chain
 936                         if state.stinger_in_progress then
 937                                 chain = stinger_chains[input_type][input_scale][overlay_really_enabled][state.stinger_frame][true]
 938                                 state.stinger_frame = state.stinger_frame + 1
 939                                 if state.stinger_frame >= 25 then
 940                                         state.stinger_in_progress = false
 941                                         state.preview_signal_num = state.stinger_src_signal
 942                                         state.live_signal_num = state.stinger_dst_signal
 943
 944                                         if state.stinger_dst_signal == VIDEO_SIGNAL_NUM then
 945                                                 -- Turn off the overlay when playing video.
 946                                                 state.stinger_save_overlay = state.overlay_enabled
 947                                                 state.overlay_enabled = false
 948                                         else
 949                                                 -- Restore the state.
 950                                                 state.overlay_enabled = state.stinger_save_overlay
 951                                         end
 952                                 end
 953                         else
 954                                 chain = simple_chains[input_type][input_scale][overlay_really_enabled][true]
 955                         end
 956                         local prepare = function()
 957                                 if input_type ~= "video" then
 958                                         chain.input:connect_signal(state.live_signal_num)
 959                                 end
 960                                 set_neutral_color_from_signal(state_copy, chain.wb_effect, state.live_signal_num)
 961                                 set_scale_parameters_if_needed(chain, width, height)
 962                                 prepare_overlay_live(state_copy, chain, t, 1.0)
 963                         end
 964                         return chain.chain, prepare
 965                 elseif state.live_signal_num == STATIC_SIGNAL_NUM then  -- Static picture.
 966                         local chain = static_chains[true]
 967                         local prepare = function()
 968                                 prepare_overlay_live(state_copy, chain, t, 1.0)  -- FIXME: Should this ever be here?
 969                         end
 970                         return chain.chain, prepare
 971                 else
 972                         assert(false)
 973                 end
 974         end
 975
 976         -- We do not show overlays on the individual preview inputs.
 977         -- The M/E preview matches what we'd put live by doing a transition, as always.
 978         local show_overlay = false
 979         if num == 1 then  -- Preview.
 980                 if state.preview_signal_num == OVERLAY_SIGNAL_NUM then
 981                         num = state.live_signal_num + 2
 982                         show_overlay = not state.overlay_enabled
 983
 984                         if state.transition_type ~= NO_TRANSITION then
 985                                 num = state.transition_dst_signal + 2
 986                         end
 987                 else
 988                         num = state.preview_signal_num + 2
 989                         show_overlay = state.overlay_enabled and simple_signal_has_overlay(state.preview_signal_num)
 990                 end
 991         end
 992
 993         -- Individual preview inputs (usually without overlay).
 994         if is_plain_signal(num - 2) then
 995                 local signal_num = num - 2
 996                 local input_type = get_input_type(signals, signal_num)
 997                 local input_scale = needs_scale(signals, signal_num, width, height)
 998                 local chain = simple_chains[input_type][input_scale][show_overlay][false]
 999                 local prepare = function()
1000                         if input_type ~= "video" then
1001                                 chain.input:connect_signal(signal_num)
1002                         end
1003                         set_neutral_color(chain.wb_effect, state_copy.neutral_colors[signal_num + 1])
1004                         set_scale_parameters_if_needed(chain, width, height)
1005                         prepare_overlay_static(chain, t)
1006                 end
1007                 return chain.chain, prepare
1008         end
1009         if num == SBS_SIGNAL_NUM + 2 then
1010                 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
1011                 local input1_type = get_input_type(signals, INPUT4_SIGNAL_NUM)
1012                 local chain = sbs_chains[input0_type][show_overlay][input1_type][false]
1013                 local prepare = function()
1014                         prepare_sbs_chain(state_copy, chain, 0.0, NO_TRANSITION, 0, SBS_SIGNAL_NUM, width, height, input_resolution)
1015                 end
1016                 return chain.chain, prepare
1017         end
1018         if num == STATIC_SIGNAL_NUM + 2 then
1019                 local chain = static_chains[false]
1020                 local prepare = function()
1021                         prepare_overlay_static(chain, t)
1022                 end
1023                 return chain.chain, prepare
1024         end
1025         if num == OVERLAY_SIGNAL_NUM + 2 then
1026                 local prepare = function()
1027 --                      prepare_overlay(overlay_chain_lq, t)
1028                 end
1029                 return overlay_chain_lq, prepare
1030         end
1031 end
1032
1033 -- This is broken, of course (even for positive numbers), but Lua doesn't give us access to real rounding.
1034 function round(x)
1035         return math.floor(x + 0.5)
1036 end
1037
1038 function lerp(a, b, t)
1039         return a + (b - a) * t
1040 end
1041
1042 function lerp_pos(a, b, t)
1043         return {
1044                 x0 = lerp(a.x0, b.x0, t),
1045                 y0 = lerp(a.y0, b.y0, t),
1046                 x1 = lerp(a.x1, b.x1, t),
1047                 y1 = lerp(a.y1, b.y1, t)
1048         }
1049 end
1050
1051 function pos_from_top_left(x, y, width, height, screen_width, screen_height)
1052         local xs = screen_width / 1280.0
1053         local ys = screen_height / 720.0
1054         return {
1055                 x0 = round(xs * x),
1056                 y0 = round(ys * y),
1057                 x1 = round(xs * (x + width)),
1058                 y1 = round(ys * (y + height))
1059         }
1060 end
1061
1062 function prepare_sbs_chain(state, chain, t, transition_type, src_signal, dst_signal, screen_width, screen_height, input_resolution)
1063         chain.input0.input:connect_signal(0)
1064         chain.input1.input:connect_signal(4)
1065         set_neutral_color(chain.input0.wb_effect, state.neutral_colors[1])
1066         set_neutral_color(chain.input1.wb_effect, state.neutral_colors[5])
1067
1068         -- Both inputs are the same size (true side-by-side).
1069         local pos0 = pos_from_top_left(1280 - 616 - 16, 186, 616, 347, screen_width, screen_height)
1070         local pos1 = pos_from_top_left(16, 186, 616, 347, screen_width, screen_height)
1071
1072         local pos_fs = { x0 = 0, y0 = 0, x1 = screen_width, y1 = screen_height }
1073         local affine_param
1074         if transition_type == NO_TRANSITION then
1075                 -- Static SBS view.
1076                 affine_param = { sx = 1.0, sy = 1.0, tx = 0.0, ty = 0.0 }   -- Identity.
1077         else
1078                 -- Zooming to/from SBS view into or out of a single view.
1079                 assert(transition_type == ZOOM_TRANSITION)
1080                 local signal, real_t
1081                 if src_signal == SBS_SIGNAL_NUM then
1082                         signal = dst_signal
1083                         real_t = t
1084                 else
1085                         assert(dst_signal == SBS_SIGNAL_NUM)
1086                         signal = src_signal
1087                         real_t = 1.0 - t
1088                 end
1089
1090                 if signal == INPUT0_SIGNAL_NUM then
1091                         affine_param = find_affine_param(pos0, lerp_pos(pos0, pos_fs, real_t))
1092                 elseif signal == INPUT4_SIGNAL_NUM then
1093                         affine_param = find_affine_param(pos1, lerp_pos(pos1, pos_fs, real_t))
1094                 end
1095         end
1096
1097         -- NOTE: input_resolution is not 1-indexed, unlike usual Lua arrays.
1098         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)
1099         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)
1100 end
1101
1102 -- Find the transformation that changes the first rectangle to the second one.
1103 function find_affine_param(a, b)
1104         local sx = (b.x1 - b.x0) / (a.x1 - a.x0)
1105         local sy = (b.y1 - b.y0) / (a.y1 - a.y0)
1106         return {
1107                 sx = sx,
1108                 sy = sy,
1109                 tx = b.x0 - a.x0 * sx,
1110                 ty = b.y0 - a.y0 * sy
1111         }
1112 end
1113
1114 function place_rectangle_with_affine(resample_effect, resize_effect, padding_effect, pos, aff, screen_width, screen_height, input_width, input_height)
1115         local x0 = pos.x0 * aff.sx + aff.tx
1116         local x1 = pos.x1 * aff.sx + aff.tx
1117         local y0 = pos.y0 * aff.sy + aff.ty
1118         local y1 = pos.y1 * aff.sy + aff.ty
1119
1120         place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
1121 end
1122
1123 function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
1124         local srcx0 = 0.0
1125         local srcx1 = 1.0
1126         local srcy0 = 0.0
1127         local srcy1 = 1.0
1128
1129         padding_effect:set_int("width", screen_width)
1130         padding_effect:set_int("height", screen_height)
1131
1132         -- Cull.
1133         if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 then
1134                 if resample_effect ~= nil then
1135                         resample_effect:set_int("width", 1)
1136                         resample_effect:set_int("height", 1)
1137                         resample_effect:set_float("zoom_x", screen_width)
1138                         resample_effect:set_float("zoom_y", screen_height)
1139                 else
1140                         resize_effect:set_int("width", 1)
1141                         resize_effect:set_int("height", 1)
1142                 end
1143                 padding_effect:set_int("left", screen_width + 100)
1144                 padding_effect:set_int("top", screen_height + 100)
1145                 return
1146         end
1147
1148         -- Clip.
1149         if x0 < 0 then
1150                 srcx0 = -x0 / (x1 - x0)
1151                 x0 = 0
1152         end
1153         if y0 < 0 then
1154                 srcy0 = -y0 / (y1 - y0)
1155                 y0 = 0
1156         end
1157         if x1 > screen_width then
1158                 srcx1 = (screen_width - x0) / (x1 - x0)
1159                 x1 = screen_width
1160         end
1161         if y1 > screen_height then
1162                 srcy1 = (screen_height - y0) / (y1 - y0)
1163                 y1 = screen_height
1164         end
1165
1166         if resample_effect ~= nil then
1167                 -- High-quality resampling.
1168                 local x_subpixel_offset = x0 - math.floor(x0)
1169                 local y_subpixel_offset = y0 - math.floor(y0)
1170
1171                 -- Resampling must be to an integral number of pixels. Round up,
1172                 -- and then add an extra pixel so we have some leeway for the border.
1173                 local width = math.ceil(x1 - x0) + 1
1174                 local height = math.ceil(y1 - y0) + 1
1175                 resample_effect:set_int("width", width)
1176                 resample_effect:set_int("height", height)
1177
1178                 -- Correct the discrepancy with zoom. (This will leave a small
1179                 -- excess edge of pixels and subpixels, which we'll correct for soon.)
1180                 local zoom_x = (x1 - x0) / (width * (srcx1 - srcx0))
1181                 local zoom_y = (y1 - y0) / (height * (srcy1 - srcy0))
1182                 resample_effect:set_float("zoom_x", zoom_x)
1183                 resample_effect:set_float("zoom_y", zoom_y)
1184                 resample_effect:set_float("zoom_center_x", 0.0)
1185                 resample_effect:set_float("zoom_center_y", 0.0)
1186
1187                 -- Padding must also be to a whole-pixel offset.
1188                 padding_effect:set_int("left", math.floor(x0))
1189                 padding_effect:set_int("top", math.floor(y0))
1190
1191                 -- Correct _that_ discrepancy by subpixel offset in the resampling.
1192                 resample_effect:set_float("left", srcx0 * input_width - x_subpixel_offset / zoom_x)
1193                 resample_effect:set_float("top", srcy0 * input_height - y_subpixel_offset / zoom_y)
1194
1195                 -- Finally, adjust the border so it is exactly where we want it.
1196                 padding_effect:set_float("border_offset_left", x_subpixel_offset)
1197                 padding_effect:set_float("border_offset_right", x1 - (math.floor(x0) + width))
1198                 padding_effect:set_float("border_offset_top", y_subpixel_offset)
1199                 padding_effect:set_float("border_offset_bottom", y1 - (math.floor(y0) + height))
1200         else
1201                 -- Lower-quality simple resizing.
1202                 local width = round(x1 - x0)
1203                 local height = round(y1 - y0)
1204                 resize_effect:set_int("width", width)
1205                 resize_effect:set_int("height", height)
1206
1207                 -- Padding must also be to a whole-pixel offset.
1208                 padding_effect:set_int("left", math.floor(x0))
1209                 padding_effect:set_int("top", math.floor(y0))
1210         end
1211 end
1212
1213 function prepare_overlay_live(state, chain, t, extra_alpha_factor)
1214         if chain.overlay then
1215                 local tt = calc_fade_progress(t, state.overlay_transition_start, state.overlay_transition_end)
1216                 local overlay_alpha = state.overlay_alpha_src + tt * (state.overlay_alpha_dst - state.overlay_alpha_src)
1217                 overlay_alpha = overlay_alpha * extra_alpha_factor
1218                 --print("overlay_alpha=" .. overlay_alpha .. " [" .. state.overlay_alpha_src .. "," .. state.overlay_alpha_dst .. "]@" .. tt)
1219                 if t > state.overlay_transition_end and state.overlay_alpha_dst == 0.0 then
1220                         state.overlay_enabled = false  -- Takes effect next frame.
1221         --              print("Turning off overlay")
1222                 end
1223                 chain.overlay.multiply_effect:set_vec4("factor", overlay_alpha, overlay_alpha, overlay_alpha, overlay_alpha)
1224         end
1225 end
1226
1227 function prepare_overlay_static(chain)
1228         if chain.overlay then
1229                 chain.overlay.multiply_effect:set_vec4("factor", 1.0, 1.0, 1.0, 1.0)
1230         end
1231 end
1232
1233 function set_neutral_color(effect, color)
1234         effect:set_vec3("neutral_color", color[1], color[2], color[3])
1235 end
1236
1237 function set_neutral_color_from_signal(state, effect, signal)
1238         if is_plain_signal(signal) then
1239                 set_neutral_color(effect, state.neutral_colors[signal - INPUT0_SIGNAL_NUM + 1])
1240         end
1241 end
1242
1243 function calc_zoom_progress(t)
1244         if t < state.transition_start then
1245                 return 0.0
1246         elseif t > state.transition_end then
1247                 return 1.0
1248         else
1249                 local tt = (t - state.transition_start) / (state.transition_end - state.transition_start)
1250                 -- Smooth it a bit.
1251                 return math.sin(tt * 3.14159265358 * 0.5)
1252         end
1253 end
1254
1255 function calc_fade_progress(t, transition_start, transition_end)
1256         local tt = (t - transition_start) / (transition_end - transition_start)
1257         if tt < 0.0 then
1258                 return 0.0
1259         elseif tt > 1.0 then
1260                 return 1.0
1261         end
1262
1263         -- Make the fade look maybe a tad more natural, by pumping it
1264         -- through a sigmoid function.
1265         tt = 10.0 * tt - 5.0
1266         tt = 1.0 / (1.0 + math.exp(-tt))
1267
1268         return tt
1269 end
1270
1271 ThemeMenu.set(
1272         { "Reload overlay", reload_cef },
1273         { "Disconnect IPTV", disconnect_iptv }
1274 )