TOOLS/lua: add cycle-deinterlace-pullup script

Override the shift+d hotkey to add a pullup step to the cycle.

TOOLS/lua/cycle-deinterlace-pullup.lua

@@ -0,0 +1,56 @@
+-- This script cycles between deinterlacing, pullup (inverse
+-- telecine), and both filters off. It uses the "deinterlace" property
+-- so that a hardware deinterlacer will be used if available.
+--
+-- It overrides the default deinterlace toggle keybinding "D"
+-- (shift+d), so that rather than merely cycling the "deinterlace" property
+-- between on and off, it adds a "pullup" step to the cycle.
+--
+-- It provides OSD feedback as to the actual state of the two filters
+-- after each cycle step/keypress.
+--
+-- Note: if hardware decoding is enabled, pullup filter will likely
+-- fail to insert.
+--
+-- TODO: It might make sense to use hardware assisted vdpaupp=pullup,
+-- if available, but I don't have hardware to test it. Patch welcome.
+
+script_name = mp.get_script_name()
+pullup_label = string.format("%s-pullup", script_name)
+
+function pullup_on()
+    for i,vf in pairs(mp.get_property_native('vf')) do
+	if vf['label'] == pullup_label then
+	    return "yes"
+	end
+    end
+    return "no"
+end
+
+function do_cycle()
+    if pullup_on() == "yes" then
+        -- if pullup is on remove it
+        mp.command(string.format("vf del @%s:pullup", pullup_label))
+        return
+    elseif mp.get_property("deinterlace") == "yes" then
+        -- if deinterlace is on, turn it off and insert pullup filter
+        mp.set_property("deinterlace", "no")
+        mp.command(string.format("vf add @%s:pullup", pullup_label))
+        return
+    else
+        -- if neither is on, turn on deinterlace
+        mp.set_property("deinterlace", "yes")
+        return
+    end
+end
+
+function cycle_deinterlace_pullup_handler()
+    do_cycle()
+    -- independently determine current state and give user feedback
+    mp.osd_message(string.format("deinterlace: %s\n"..
+                                     "pullup: %s",
+                                 mp.get_property("deinterlace"),
+                                 pullup_on()))
+end
+
+mp.add_key_binding("D", "cycle-deinterlace-pullup", cycle_deinterlace_pullup_handler)