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PROCESSOR-SDK-J721S2: edgeai-tiovx-apps: Expose dl_block output pad as graph parameter

Ahmed Mujtaba
Prodigy 235 points

Part Number: PROCESSOR-SDK-J721S2

Tool/software:

Hi,

I am working on edgeai-tiovx-apps and for multiple models inference, the application initializes a new dl_block for each model. Each dl_block->output_pad is connected to the output_block->input_pads list that will be later used by mosiac_node to display the results.

I am developing an application on top of edgeai-tiovx-apps in which I am running two models. In this application, I only want to show the output of one model on the display, while just using the inference results of other model. For this, I want to expose the output_pad of dl_block as graph parameter. 

Hence, I would like to know how I can expose the dl_block->output_pad as graph parameter in the connect_blocks function in app.c? 

Thanks,

Ahmed

  • 0
    TI__Mastermind 19670 points

    Hi Ahmed,

    I am redirecting your question to the proper engineer. Thank you for your patience.

    -Fabiana

  • +1 in reply to Fabiana Jaimes
    TI__Guru* 90861 points

    Hi Ahmed,

    Typically the graph parameters are achieved by using the tee nodes in edgeai-tiovx-apps. 

    Are you already using the same? You can find the usage of tee in the sample demo apps.

    Regards,

    Nikhil

  • 0 in reply to Nikhil Dasan
    Prodigy 235 points

    Hi Nikhil,

    Thanks for the response.

    Nikhil Dasan said:
    Are you already using the same?

    I was trying to put dl_block->output_pad = NULL, similar to the display node output for RTOS Display from "edgeai-tiovx-apps/apps/src/output_block.c" file.

    #if !defined(SOC_AM62A) && !defined(SOC_J722S)
    /* RTOS_DISPLAY */
    if(output_info->sink == RTOS_DISPLAY)
    {
        TIOVXDisplayNodeCfg display_cfg;
        NodeObj *display_node = NULL;

        tiovx_display_init_cfg(&display_cfg);

        display_cfg.width = output_info->width;
        display_cfg.height = output_info->height;
        display_cfg.params.outWidth  = output_info->width;
        display_cfg.params.outHeight = output_info->height;
        display_cfg.params.posX = (1920 - output_info->width)/2;
        display_cfg.params.posY = (1080 - output_info->height)/2;

        display_node = tiovx_modules_add_node(graph,
                                              TIOVX_DISPLAY,
                                              (void *)&display_cfg);

        /* Link Mosaic to Display */
        tiovx_modules_link_pads(output_pad, &display_node->sinks[0]);

        output_pad = NULL;
    }
#endif

    output_block->output_pad = output_pad;

    return status;
}

    As you can see that "output_block->output_pad = output_pad", the "output pad = NULL".

    I tried to implement the same logic to dl_block->output_pad, but the application freezes in the "app.c" while loop, in which it cannot dequeue the buf_pool of input pad of input block.

    in_buf_pool = input_blocks[i].input_pad->buf_pool;
    inbuf = tiovx_modules_dequeue_buf(in_buf_pool);      // the program stops here

    Can you let me know why input block got affected when I put the dl_block->output_pad = NULL of one model while the other is connected to the input pad of output block?

    Thanks,

    Ahmed

  • +1 in reply to Ahmed Mujtaba
    TI__Expert 4369 points

    Hi Ahmed,

    Whenever a pad is left unconnected it becomes a graph parameter

    For your use case I suggest writing a separate app instead of modifying existing app

    Please take a look at simple tests we have, which are easy to follow and take reference from

    edgeai-tiovx-apps/tests/app_tiovx_dl_pipeline_test.c at develop · TexasInstruments/edgeai-tiovx-apps (github.com)

    Regards
    Rahul T R

  • 0 in reply to Rahul Ravikumar
    Prodigy 235 points

    Thanks Rahul for the valuable suggestion and sharing the information!

    Regards,

    Ahmed

  • 0
    Prodigy 61 points

    Not suggest Run edgeai-tiovx-apps On PROCESSOR-SDK-J721S2.You can Run it on edgeai SDK.

  • 0 in reply to xingde liu
    TI__Guru* 90861 points

    Sorry, did not understand your concern here

    Regards,

    Nikhil