scripts/faders_to_trims.lua

   1 ardour {
   2         ["type"]    = "EditorAction",
   3         name        = "Faders to Trims",
   4         license     = "MIT",
   5         author      = "PSmith",
   6         description = [[Add 'Trim' plugins to all tracks.  Move the fader value into the trim.]]
   7 }
   8
   9 function action_params ()
  10         return
  11         {
  12         }
  13 end
  14
  15
  16 function factory (params)
  17         return function ()
  18                 -- loop over all tracks
  19                 for t in Session:get_tracks():iter() do
  20
  21                         fader_value = t:gain_control():get_value()
  22                         v = math.log(fader_value, 10)
  23                         trim_gain = 20*v
  24                         fader_pos = 0
  25                         local proc;
  26                         local i = 0;
  27
  28                         repeat
  29                                 -- find the fader proc
  30                                 proc = t:nth_processor (i)
  31                                 if (not proc:isnil() and proc:display_name () == "Fader") then
  32                                         fader_pos = i
  33                                 end
  34                                 i = i + 1
  35                         until proc:isnil()
  36
  37                         -- apply the trim
  38                         trim = t:nth_processor (fader_pos+1)
  39                         if (not trim:isnil() and trim:display_name () == "a-Amplifier") then
  40                                 --existing trim found; sum the trim and the fader gain, and set the trim to that value
  41                                 cur_gain = ARDOUR.LuaAPI.get_processor_param (trim, 0)
  42                                 ARDOUR.LuaAPI.set_processor_param (trim, 0, trim_gain+cur_gain)
  43                         else
  44                                 --create a new Trim processor, and set its value to match the fader
  45                                 local a = ARDOUR.LuaAPI.new_luaproc(Session, "a-Amplifier");
  46                                 if (not a:isnil()) then
  47                                         t:add_processor_by_index(a, fader_pos-1, nil, true)
  48                                         ARDOUR.LuaAPI.set_processor_param (a, 0, trim_gain)
  49                                         a = nil -- explicitly drop shared-ptr reference
  50                                 end
  51                         end
  52
  53                         --zero the fader gain
  54                         t:gain_control():set_value(1, PBD.GroupControlDisposition.NoGroup)
  55
  56                 end --foreach track
  57
  58         end  --function
  59
  60 end --factory