1uri_http_pgie_iou_tracker_osd_window.cpp

/*
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Copyright (c) 2024, Prominence AI, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy
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*/

/*################################################################################
#
# The simple example demonstrates how to create a set of Pipeline components, 
# specifically:
#   - HTTP URI Source
#   - Primary GST Inference Engine (PGIE)
#   - IOU Tracker
#   - On-Screen Display (OSD)
#   - Window Sink
# ...and how to add them to a new Pipeline and play
# 
# The example registers handler callback functions with the Pipeline for:
#   - component-buffering messages
#   - key-release events
#   - delete-window events
#   - end-of-stream EOS events
#   - Pipeline change-of-state events
#  
# IMPORTANT! The URI Source will send messages on the Pipeline bus when
# buffering is in progress.  The buffering_message_handler callback is 
# added to the Pipeline to be called with every buffer message received.
# The handler callback is required to pause the Pipeline while buffering
# is in progress. 
#
# The callback is called with the percentage of buffering done, with 
# 100% indicating that buffering is complete.
#
##############################################################################*/

#include <iostream>
#include <glib.h>
#include <gst/gst.h>
#include <gstnvdsmeta.h>
#include <nvdspreprocess_meta.h>
#include "DslApi.h"

// URI for the Source Component
std::wstring source_uri(
    L"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4");

// Config and model-engine files 
std::wstring primary_infer_config_file(
    L"/opt/nvidia/deepstream/deepstream/sources/apps/sample_apps/deepstream-preprocess-test/config_infer.txt");
std::wstring primary_model_engine_file(
    L"/opt/nvidia/deepstream/deepstream/samples/models/Primary_Detector/resnet18_trafficcamnet.etlt_b8_gpu0_int8.engine");

// Config file used by the IOU Tracker    
std::wstring iou_tracker_config_file(
    L"/opt/nvidia/deepstream/deepstream/samples/configs/deepstream-app/config_tracker_IOU.yml");

// EGL Window Sink Dimensions 
uint WINDOW_WIDTH = DSL_1K_HD_WIDTH / 2;
uint WINDOW_HEIGHT = DSL_1K_HD_HEIGHT / 2;

boolean buffering = false;

// 
// Function to be called when a buffering-message is recieved on the Pipeline bus.
// 
void buffering_message_handler(const wchar_t* source, uint percent, void* client_data)
{

    if (percent == 100)
    {
        std::cout << "playing pipeline - buffering complete at 100 %"
            << std::endl;
        dsl_pipeline_play(L"pipeline");
        buffering = false;
    }
    else
    {
        if (!buffering)
        {
            std::cout << "pausing pipeline - buffering starting at "
                << percent << "%" << std::endl;
            dsl_pipeline_pause(L"pipeline");
        }
        buffering = true;
    }
}        

// 
// Function to be called on XWindow KeyRelease event
// 
void xwindow_key_event_handler(const wchar_t* in_key, void* client_data)
{   
    std::wstring wkey(in_key); 
    std::string key(wkey.begin(), wkey.end());
    std::cout << "key released = " << key << std::endl;
    
    key = std::toupper(key[0]);
    if(key == "P"){
        dsl_pipeline_pause(L"pipeline");
    } else if (key == "R"){
        dsl_pipeline_play(L"pipeline");
    } else if (key == "Q" or key == "" or key == ""){
        std::cout << "Main Loop Quit" << std::endl;
        dsl_pipeline_stop(L"pipeline");
        dsl_main_loop_quit();
    }
}

// 
// Function to be called on XWindow Delete event
//
void xwindow_delete_event_handler(void* client_data)
{
    std::cout<<"delete window event"<<std::endl;
    dsl_pipeline_stop(L"pipeline");
    dsl_main_loop_quit();
}
    
// 
// Function to be called on End-of-Stream (EOS) event
// 
void eos_event_listener(void* client_data)
{
    std::cout<<"Pipeline EOS event"<<std::endl;
    dsl_pipeline_stop(L"pipeline");
    dsl_main_loop_quit();
}    

// 
// Function to be called on every change of Pipeline state
// 
void state_change_listener(uint old_state, uint new_state, void* client_data)
{
    std::cout<<"previous state = " << dsl_state_value_to_string(old_state) 
        << ", new state = " << dsl_state_value_to_string(new_state) << std::endl;
}

int main(int argc, char** argv)
{
    DslReturnType retval = DSL_RESULT_FAILURE;

    // Since we're not using args, we can Let DSL initialize GST on first call    
    while(true) 
    {    

        // New URI Source with HTTP URI
        retval = dsl_source_uri_new(L"uri-source", 
            source_uri.c_str(), false, false, 0);
        if (retval != DSL_RESULT_SUCCESS) break;

        // New Primary GIE using the filespecs defined above, with interval and Id
        retval = dsl_infer_gie_primary_new(L"primary-gie", 
            primary_infer_config_file.c_str(), primary_model_engine_file.c_str(), 0);
        if (retval != DSL_RESULT_SUCCESS) break;
        
        // New IOU Tracker, setting operational width and height of input frame
        retval = dsl_tracker_new(L"iou-tracker", 
            iou_tracker_config_file.c_str(), 480, 272);
        if (retval != DSL_RESULT_SUCCESS) break;

        // New OSD with text, clock and bbox display all enabled. 
        retval = dsl_osd_new(L"on-screen-display", true, true, true, false);
        if (retval != DSL_RESULT_SUCCESS) break;

        // New Window Sink, 0 x/y offsets.
        retval = dsl_sink_window_egl_new(L"egl-sink", 0, 0, 
            WINDOW_WIDTH, WINDOW_HEIGHT);
        if (retval != DSL_RESULT_SUCCESS) break;

        // Add the XWindow event handler functions defined above
        retval = dsl_sink_window_key_event_handler_add(L"egl-sink", 
            xwindow_key_event_handler, NULL);
        if (retval != DSL_RESULT_SUCCESS) break;

        retval = dsl_sink_window_delete_event_handler_add(L"egl-sink", 
            xwindow_delete_event_handler, NULL);
        if (retval != DSL_RESULT_SUCCESS) break;
    
        // Create a list of Pipeline Components to add to the new Pipeline.
        const wchar_t* components[] = {L"uri-source",  L"primary-gie", 
            L"iou-tracker", L"on-screen-display", L"egl-sink", NULL};
        
        // Add all the components to our pipeline
        retval = dsl_pipeline_new_component_add_many(L"pipeline", components);
        if (retval != DSL_RESULT_SUCCESS) break;
            
        // Add the buffering-handler defined above to the pipeline
        retval = dsl_pipeline_buffering_message_handler_add(L"pipeline",
            buffering_message_handler, NULL);
        if (retval != DSL_RESULT_SUCCESS) break;

        // Add the EOS listener function defined above
        retval = dsl_pipeline_eos_listener_add(L"pipeline", eos_event_listener, NULL);
        if (retval != DSL_RESULT_SUCCESS) break;

        // Add the State Change listener function defined above
        retval = dsl_pipeline_state_change_listener_add(L"pipeline", 
            state_change_listener, NULL);
        if (retval != DSL_RESULT_SUCCESS) break;

        // Play the pipeline
        retval = dsl_pipeline_play(L"pipeline");
        if (retval != DSL_RESULT_SUCCESS) break;

        // Start and join the main-loop
        dsl_main_loop_run();
        break;

    }
    
    // Print out the final result
    std::wcout << dsl_return_value_to_string(retval) << std::endl;

    dsl_delete_all();

    std::cout<<"Goodbye!"<<std::endl;  
    return 0;
}