Camera Web Server Demo - Refresh values on Web page?

[salbdch]

Hello,
I need to refresh board specific values(board's S-out value) on web page every time get-still button clicked.
So I'd change code app_httpd.c and index_ov5640.html but it has no changes.
What am i missing?

Code: Select all

static esp_err_t capture_handler(httpd_req_t *req)
{
    camera_fb_t *fb = NULL;
    esp_err_t res = ESP_OK;
    int64_t fr_start = esp_timer_get_time();

#ifdef CONFIG_LED_ILLUMINATOR_ENABLED
    enable_led(true);
    vTaskDelay(150 / portTICK_PERIOD_MS); // The LED needs to be turned on ~150ms before the call to esp_camera_fb_get()
    fb = esp_camera_fb_get();             // or it won't be visible in the frame. A better way to do this is needed.
    enable_led(false);
#else
    fb = esp_camera_fb_get();
#endif

    if (!fb)
    {
        ESP_LOGE(TAG, "Camera capture failed");
        httpd_resp_send_500(req);
        return ESP_FAIL;
    }

    httpd_resp_set_type(req, "image/jpeg");
    httpd_resp_set_hdr(req, "Content-Disposition", "inline; filename=capture.jpg");
    httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");

    char ts[32];
    snprintf(ts, 32, "%ld.%06ld", fb->timestamp.tv_sec, fb->timestamp.tv_usec);
    httpd_resp_set_hdr(req, "X-Timestamp", (const char *)ts);

#if CONFIG_ESP_FACE_DETECT_ENABLED
    size_t out_len, out_width, out_height;
    uint8_t *out_buf;
    bool s;
    bool detected = false;
    int face_id = 0;
    if (!detection_enabled || fb->width > 400)
    {
#endif
        size_t fb_len = 0;
        if (fb->format == PIXFORMAT_JPEG)
        {
            fb_len = fb->len;
            res = httpd_resp_send(req, (const char *)fb->buf, fb->len);


#if 1 //20210218 Refresh S-out value on web page 
            static char json_response[17];    
            char * p = json_response;
            *p++ = '{';    
            p+=sprintf(p, "\"s-out\":%u,", 654321);
            *p++ = '}';
            *p++ = 0;
            httpd_resp_set_type(req, "application/json");
            httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
            httpd_resp_send(req, json_response, strlen(json_response));
#endif
        }
        else
        {
            jpg_chunking_t jchunk = {req, 0};
            res = frame2jpg_cb(fb, 80, jpg_encode_stream, &jchunk) ? ESP_OK : ESP_FAIL;
            httpd_resp_send_chunk(req, NULL, 0);
            fb_len = jchunk.len;
        }
        esp_camera_fb_return(fb);
        int64_t fr_end = esp_timer_get_time();
        ESP_LOGI(TAG, "JPG: %uB %ums", (uint32_t)(fb_len), (uint32_t)((fr_end - fr_start) / 1000));
        return res;
#if CONFIG_ESP_FACE_DETECT_ENABLED
    }

    dl_matrix3du_t *image_matrix = dl_matrix3du_alloc(1, fb->width, fb->height, 3);
    if (!image_matrix)
    {
        esp_camera_fb_return(fb);
        ESP_LOGE(TAG, "dl_matrix3du_alloc failed");
        httpd_resp_send_500(req);
        return ESP_FAIL;
    }

    out_buf = image_matrix->item;
    out_len = fb->width * fb->height * 3;
    out_width = fb->width;
    out_height = fb->height;

    s = fmt2rgb888(fb->buf, fb->len, fb->format, out_buf);
    esp_camera_fb_return(fb);
    if (!s)
    {
        dl_matrix3du_free(image_matrix);
        ESP_LOGE(TAG, "to rgb888 failed");
        httpd_resp_send_500(req);
        return ESP_FAIL;
    }

    box_array_t *net_boxes = face_detect(image_matrix, &mtmn_config);

    if (net_boxes)
    {
        detected = true;
#if CONFIG_ESP_FACE_RECOGNITION_ENABLED
        if (recognition_enabled)
        {
            face_id = run_face_recognition(image_matrix, net_boxes);
        }
#endif
        draw_face_boxes(image_matrix, net_boxes, face_id);
        dl_lib_free(net_boxes->score);
        dl_lib_free(net_boxes->box);
        if (net_boxes->landmark != NULL)
            dl_lib_free(net_boxes->landmark);
        dl_lib_free(net_boxes);
    }

    jpg_chunking_t jchunk = {req, 0};
    s = fmt2jpg_cb(out_buf, out_len, out_width, out_height, PIXFORMAT_RGB888, 90, jpg_encode_stream, &jchunk);
    dl_matrix3du_free(image_matrix);
    if (!s)
    {
        ESP_LOGE(TAG, "JPEG compression failed");
        return ESP_FAIL;
    }

    int64_t fr_end = esp_timer_get_time();
    ESP_LOGI(TAG, "FACE: %uB %ums %s%d", (uint32_t)(jchunk.len), (uint32_t)((fr_end - fr_start) / 1000), detected ? "DETECTED " : "", face_id);
    return res;
#endif
}

Code: Select all

                        <section id="buttons">
                            <button id="get-still">Get Still</button>
                              <div class="input-group">
                              <label for="s-out">S-out Value:</label>
                              <div class="text">
                                  <span id="s-out">123456</span>
                              </div>
                               </div>
                            <button id="toggle-stream">Start Stream</button>
                            <button id="face_enroll" class="hidden" disabled="disabled">Enroll Face</button>
                        </section>