push script

speed-transition.lua

@@ -0,0 +1,111 @@
+lookahead=5  --if nextsub >= lookahead then speedup
+normalspeed=mp.get_property_native("speed")
+speedup=2.5
+-------------------
+
+state=0
+enable=false
+
+function set_timeout()
+   if mp.get_property_native("cache-size") ~= nil then
+      time_out = mp.get_property_native("cache-secs")
+   else
+      time_out = mp.get_property_native("demuxer-readahead-secs")
+   end
+   return time_out
+end
+
+function check_should_speedup()
+   subdelay = mp.get_property_native("sub-delay")
+   mp.command("no-osd set sub-visibility no")
+   mp.command("no-osd sub-step 1")
+   nextsub = math.abs(mp.get_property_native("sub-delay"))-math.abs(subdelay)
+   --print("nextsub in seconds "..nextsub)
+   mp.set_property("sub-delay", subdelay)
+   mp.command("no-osd set sub-visibility yes")
+   return nextsub, nextsub >= lookahead or nextsub == 0
+end
+
+function search_next_sub()
+   nextsub, _ = check_should_speedup()
+   add_timers(nextsub)
+end
+
+function add_timers(nextsub)
+   --We know when the next sub comes
+   if nextsub ~= 0 then
+      --make sure we reset the speed on the unlikely case when a timer fires
+      --within one second of the next sub
+      if nextsub - 1 > 0 then
+         mp.add_timeout((nextsub-1)/speedup, reset_early)
+      else
+         mp.set_property("speed", normalspeed)
+      end
+      --We don't know when the next sub comes, so search for it recursively
+   elseif nextsub == 0 then
+      --search for next sub after time_out seconds, when its position might be known
+      if not mp.get_property_native("pause") and set_timeout() - 1 > 0 then
+         mp.add_timeout((time_out-1)/speedup, search_next_sub)
+      end
+   end
+end
+
+--reset to normal speed before subtitle shows up
+--prevents ugly audio glitches when speech starts
+function reset_early()
+   --check if it really is time to reset
+   --prevents premature change to normal speed due to seeking/pausing
+   --seeking/pausing results in firing timers early/late
+   if mp.get_property_native("sub-text") == "" and state == 1 then
+      nextsub , shouldspeedup = check_should_speedup()
+      if not shouldspeedup then
+         --print("reset_early executed")
+         mp.set_property("speed", normalspeed)
+      else
+         --print("reset_early aborted! Seeking/Pausing?")
+      end
+   end
+end
+
+function speed_transition(subtext, sub)
+   if state == 0 then
+      if sub == "" then
+         nextsub, shouldspeedup = check_should_speedup()
+         if shouldspeedup then
+            normalspeed = mp.get_property_native("speed")
+            mp.set_property("speed", speedup)
+            add_timers(nextsub)
+            state = 1
+         end
+      end
+   elseif state == 1 then
+      if sub ~= "" then
+         mp.set_property("speed", normalspeed)
+         state = 0
+      end
+   end
+end
+
+function toggle()
+   if not enable then
+      enable = true
+      state = 0
+      mp.observe_property("sub-text", "native", speed_transition)
+      mp.osd_message("speed-transition enabled")
+   else
+      enable = false
+      state = 0
+      mp.set_property("speed", normalspeed)
+      mp.unobserve_property(speed_transition)
+      mp.osd_message("speed-transition disabled")
+   end
+end
+
+function pause(e,v)
+   if not v and state == 1 then
+      search_next_sub()
+   end
+end
+
+mp.observe_property("pause", "native", pause)
+mp.add_key_binding("Ctrl+j", "toggle_speedtrans", toggle)