TOOLS: add lua/drc-control

allows live insertion/deletion/adjustment of drc audio filter

1 files changed, 80 insertions, 0 deletions

diff --git a/TOOLS/lua/drc-control.lua b/TOOLS/lua/drc-control.lua
new file mode 100644
index 0000000000..32ba76eb86
--- /dev/null
+++ b/TOOLS/lua/drc-control.lua
@@ -0,0 +1,80 @@
+script_name=mp.get_script_name():gsub("lua/","",1)
+
+function print_state(params)
+   if params then
+      mp.osd_message(script_name..':\n'
+			.."method = "..params['method'].."\n"
+			.."target = "..params['target'])
+   else
+      mp.osd_message(script_name..':\noff')
+   end
+end
+
+function get_index_of_drc(afs)
+   for i,af in pairs(afs) do
+      if af['label']==script_name then
+	 return i
+      end
+   end
+end
+
+function append_drc(afs)
+   afs[#afs+1]={
+      name="drc",
+      label=script_name,
+      params={
+	 method="1",
+	 target="0.25"
+      }
+   }
+   print_state(afs[#afs]['params'])
+end
+
+function modify_or_create_af(fun)
+   afs=mp.get_property_native('af')
+   i=get_index_of_drc(afs)
+   if not i then
+      append_drc(afs)
+   else
+      fun(afs,i)
+   end
+   mp.set_property_native('af',afs)
+end
+
+function drc_toggle_method_handler()
+   modify_or_create_af(
+      function (afs,i)
+	 new_method=(afs[i]['params']['method']+1)%3
+	 if new_method==0 then
+	    table.remove(afs,i)
+	    print_state(nil)
+	 else
+	    afs[i]['params']['method']=tostring((afs[i]['params']['method'])%2+1)
+	    print_state(afs[i]['params'])
+	 end
+      end
+   )
+end
+
+function drc_scale_target(factor)
+   modify_or_create_af(
+      function (afs)
+	 afs[i]['params']['target']=tostring(afs[i]['params']['target']*factor)
+	 print_state(afs[i]['params'])
+      end
+   )
+end
+
+function drc_louder_handler()
+   drc_scale_target(2.0)
+end
+
+function drc_quieter_handler()
+   drc_scale_target(0.5)
+end
+
+-- toggle between off, method 1 and method 2 
+mp.add_key_binding("\\","drc_toggle_method",drc_toggle_method_handler)
+-- increase or decrease target volume
+mp.add_key_binding("ctrl+9","drc_quieter",drc_quieter_handler)
+mp.add_key_binding("ctrl+0","drc_louder",drc_louder_handler)