gmem not connecting properly: what am i doing wrong?

[rekkandevar]

I am trying to write a script which will transmit a media item's notes to the video processor to use as a subtitle. The roadblock I have encountered is that no matter what I do, none of the gmem values I'm writing inside the Reascript are being read from the video processor. Please let me know what I'm doing wrong here.

Here is the ReaScript:

local memory_start = 0
local max_tracks = 16
local max_text_length = 256

reaper.gmem_attach("Subtitles")
for i = memory_start, memory_start + (max_tracks * max_text_length) - 1 do
    reaper.gmem_write(i, i) --gmem should contain 1, 2, 3, etc.
end


local function store_text_in_memory(track_index, text)
    local memory_index = memory_start + (track_index * max_text_length)
    for i = 1, max_text_length do
        char_code = 0 <= #text and text:byte(i) or 0
        reaper.gmem_write(memory_index + i - 1, char_code)
    end
end

local function update_global_memory()
    local playhead_position = reaper.GetPlayPosition()
    for track_index = 0, 0 do --limited to track 1 for testing
        track = reaper.GetTrack(0, track_index)
        did = 0
        if track then
            local item_count = reaper.CountTrackMediaItems(track)
            local text = ""

            for item_index = 0, item_count - 1 do
                local item = reaper.GetTrackMediaItem(track, item_index)
                local item_start = reaper.GetMediaItemInfo_Value(item, "D_POSITION")
                local item_length = reaper.GetMediaItemInfo_Value(item, "D_LENGTH")
                local item_end = item_start + item_length
                if playhead_position >= item_start and playhead_position <= item_end then
                    --local take = reaper.GetActiveTake(item)
                    if item then
                        retval, note = reaper.GetSetMediaItemInfo_String(item, "P_NOTES", "", false)
                        text = note
                        did = 1
                    end
                end
            end
            if did == 0 then
              text = ""
            end

            store_text_in_memory(track_index, text)
        else
            store_text_in_memory(track_index, "")
        end
    end
   
end

local function main()
    update_global_memory()
    gfx.update()
    reaper.defer(main)
end

gfx.init("Subtitle Sync", 1, 1, 0, 0, 0)
main()

and here is the video processor preset I've written (heavily adapted from the default text overlay):

//@param1:size 'text height' 0.05 0.01 0.2 0.1 0.001
//@param2:ypos 'y position' 0.95 0 1 0.5 0.01
//@param3:xpos 'x position' 0.5 0 1 0.5 0.01
//@param4:border 'bg pad' 0.1 0 1 0.5 0.01
//@param5:fgc 'text bright' 1.0 0 1 0.5 0.01
//@param6:fga 'text alpha' 1.0 0 1 0.5 0.01
//@param7:bgc 'bg bright' 0.75 0 1 0.5 0.01
//@param8:bga 'bg alpha' 0.5 0 1 0.5 0.01
//@param9:bgfit 'fit bg to text' 0 0 1 0.5 1
//@param10:ignoreinput 'ignore input' 0 0 1 0.5 1

//@param12:tc 'show timecode' 0 0 1 0.5 1
//@param13:tcdf 'dropframe timecode' 0 0 1 0.5 1
//@param14:chn 'current track' 0 0 8 1 1
//@gmem:Subtitles

font = "Arial";
index = chn;

track = chn;
max_text_length = 256;
memory_start = 0;


input = ignoreinput ? -2:0;
project_wh_valid===0 ? input_info(input,project_w,project_h);
gfx_a2=0;
gfx_blit(input,1);
gfx_setfont(size*project_h,font);
i=0;
#text = "";
memory_index = memory_start + track * max_text_length;
gfx_str_measure(#text,txtw,txth);
b = (border*txth)|0;
yt = ((project_h - txth - b*2)*ypos)|0;
xp = (xpos * (project_w-txtw))|0;
gfx_set(bgc,bgc,bgc,bga);
bga>0?gfx_fillrect(bgfit?xp-b:0, yt, bgfit?txtw+b*2:project_w, txth+b*2);
gfx_set(fgc,fgc,fgc,fga);
#text = "";
loop(10,
  value = gmem[memory_index + i];
  sprintf(#text, "gmem[%d] = %d", memory_index + i, value);
  gfx_str_draw(#text, 10, gfx_y);
  gfx_y += 20;
  i+=1;
);

I'm pretty clueless at this point. It really seems like gmem isn't working at all and I have no idea how to debug that. Thank you

[rekkandevar]

it had to be

//@gmem=Subtitles

instead of

//@gmem:Subtitles

[mschnell]

Thanks for letting us know !