Add support for downloading BMPs through the web server

examples/single_chip/camera_web_server/main/app_httpd.c

@@ -289,6 +289,44 @@ void enable_led(bool en)
 }
 #endif
 
+static esp_err_t bmp_handler(httpd_req_t *req)
+{
+    camera_fb_t *fb = NULL;
+    esp_err_t res = ESP_OK;
+    uint64_t fr_start = esp_timer_get_time();
+    fb = esp_camera_fb_get();
+    if (!fb)
+    {
+        ESP_LOGE(TAG, "Camera capture failed");
+        httpd_resp_send_500(req);
+        return ESP_FAIL;
+    }
+
+    httpd_resp_set_type(req, "image/x-windows-bmp");
+    httpd_resp_set_hdr(req, "Content-Disposition", "inline; filename=capture.bmp");
+    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);
+
+
+    uint8_t * buf = NULL;
+    size_t buf_len = 0;
+    bool converted = frame2bmp(fb, &buf, &buf_len);
+    esp_camera_fb_return(fb);
+    if(!converted){
+        ESP_LOGE(TAG, "BMP Conversion failed");
+        httpd_resp_send_500(req);
+        return ESP_FAIL;
+    }
+    res = httpd_resp_send(req, (const char *)buf, buf_len);
+    free(buf);
+    uint64_t fr_end = esp_timer_get_time();
+    ESP_LOGI(TAG, "BMP: %llums, %uB", (uint64_t)((fr_end - fr_start) / 1000), buf_len);
+    return res;
+}
+
 static size_t jpg_encode_stream(void *arg, size_t index, const void *data, size_t len)
 {
     jpg_chunking_t *j = (jpg_chunking_t *)arg;
@@ -761,10 +799,11 @@ static esp_err_t cmd_handler(httpd_req_t *req)
 #endif
 #endif
     else {
+        ESP_LOGI(TAG, "Unknown command: %s", variable);
         res = -1;
     }
 
-    if (res) {
+    if (res < 0) {
         return httpd_resp_send_500(req);
     }
 
@@ -807,7 +846,7 @@ static esp_err_t status_handler(httpd_req_t *req)
             p+=print_reg(p, s, reg, 0xFF);
         }
         p+=print_reg(p, s, 0x558a, 0x1FF);//9 bit
-    } else {
+    } else if(s->id.PID == OV2640_PID){
         p+=print_reg(p, s, 0xd3, 0xFF);
         p+=print_reg(p, s, 0x111, 0xFF);
         p+=print_reg(p, s, 0x132, 0xFF);
@@ -1075,7 +1114,7 @@ static esp_err_t monitor_handler(httpd_req_t *req)
 void app_httpd_main()
 {
     httpd_config_t config = HTTPD_DEFAULT_CONFIG();
-    config.max_uri_handlers = 12;
+    config.max_uri_handlers = 16;
 
     httpd_uri_t index_uri = {
         .uri = "/",
@@ -1107,6 +1146,12 @@ void app_httpd_main()
         .handler = stream_handler,
         .user_ctx = NULL};
 
+    httpd_uri_t bmp_uri = {
+        .uri = "/bmp",
+        .method = HTTP_GET,
+        .handler = bmp_handler,
+        .user_ctx = NULL};
+
     httpd_uri_t xclk_uri = {
         .uri = "/xclk",
         .method = HTTP_GET,
@@ -1179,6 +1224,7 @@ void app_httpd_main()
         httpd_register_uri_handler(camera_httpd, &cmd_uri);
         httpd_register_uri_handler(camera_httpd, &status_uri);
         httpd_register_uri_handler(camera_httpd, &capture_uri);
+        httpd_register_uri_handler(camera_httpd, &bmp_uri);
 
         httpd_register_uri_handler(camera_httpd, &xclk_uri);
         httpd_register_uri_handler(camera_httpd, &reg_uri);