Create smandrap_Set selected tracks pan mode based on media items.lua

Various/smandrap_Set selected tracks pan mode based on media items.lua

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+-- @description Set selected tracks pan mode based on media items
+-- @author smandrap
+-- @version 1.0
+-- @about
+--   Set the track to the appropriate pan mode based on the items in the track.
+-- 
+--   #### Examples: 
+--   - Track has only mono media -> Pan Mode: Stereo Balance
+--   - Track has stereo media    -> Pan Mode: Stereo Pan
+--   - Track has both            -> Pan Mode: Stereo Pan
+--
+--   Choice between Stereo Pan/Dual Pan in script user area
+
+-------------------------------------------------------------
+----------------------    USER AREA   -----------------------
+-------------------------------------------------------------
+
+
+local DUAL_PAN = false -- Set to true to use dual pan mode for track with stereo media
+
+
+-------------------------------------------------------------
+-------------------------------------------------------------
+
+
+local reaper = reaper
+
+local function process_items_on_track(track)
+  local item_cnt = reaper.CountTrackMediaItems(track) - 1
+  if item_cnt == -1 then return end
+
+  local item
+  local take
+  local src
+  local num_chan
+  local chan_mode
+
+  for i = 0, item_cnt do
+
+    item = reaper.GetTrackMediaItem(track, i)
+    take = reaper.GetActiveTake(item)
+    src = reaper.GetMediaItemTake_Source(take)
+
+    num_chan = reaper.GetMediaSourceNumChannels(src)
+    chan_mode = reaper.GetMediaItemTakeInfo_Value(take, 'I_CHANMODE')
+
+    if num_chan > 1 and chan_mode < 2 then
+      -- Stereo thing found
+      reaper.SetMediaTrackInfo_Value(track, 'I_PANMODE', DUAL_PAN and 6 or 5)
+      return
+    end
+
+  end
+
+  -- All items are mono
+  reaper.SetMediaTrackInfo_Value(track, 'I_PANMODE', 3)
+end
+
+
+local function main()
+  local sel_tr_cnt = reaper.CountSelectedTracks() - 1
+  if sel_tr_cnt == -1 then return end
+
+  for i = 0, sel_tr_cnt do
+    process_items_on_track(reaper.GetSelectedTrack(0, i))
+  end
+
+end
+
+reaper.Undo_BeginBlock()
+main()
+reaper.Undo_EndBlock("Set selected tracks pan mode based on media items", -1)