Enable multithreading in DNG SDK

Hi all,

I have to process very fast a large amount of DNG files (couple of thousands) and I have to do this on a regular basis. The processing is a simple conversion to TIF, white balance, and all other parameters are left default. The output is RGB 8 bit per pixel. I have tried libraw but it gets to 2.5 seconds per image and it is a bit slow.

Currently I get the following results from dng_validate:

Raw image read time: 0.064 sec
Linearization time: 0.020 sec
Interpolate time: 0.273 sec
Render time: 0.541 sec

This is about 1 second per file.

Is it possible to use multiple threads when calling render.Render()? It would be great to reduce the time to 0.3/0.2 seconds for this/

Are we talking about features that are not documented/flags to pass when compiling the library/complete re-write since the library was not designed with this in mind?

I poked through the code and found that there is some threading in the code:

void dng_area_task::Perform (dng_area_task &task,
                               const dng_rect &area,
                               dng_memory_allocator *allocator,
                               dng_abort_sniffer *sniffer)
    {
   
    dng_point tileSize (task.FindTileSize (area));
       
    task.Start (1, tileSize, allocator, sniffer);
   
    task.ProcessOnThread (0, area, tileSize, sniffer);
           
    task.Finish (1);
   
    }

but it seems that regardless how many threads they are, the tasks are perfromed single threaded.

thank you,

Calin