Add MDNS feature that allows the cameras to be found

examples/single_chip/camera_web_server/main/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(COMPONENT_SRCS "app_main.c" "app_wifi.c" "app_camera.c" "app_httpd.c")
+set(COMPONENT_SRCS "app_main.c" "app_wifi.c" "app_camera.c" "app_httpd.c" "app_mdns.c")
 set(COMPONENT_ADD_INCLUDEDIRS "include")
 
 set(COMPONENT_REQUIRES

examples/single_chip/camera_web_server/main/app_httpd.c

@@ -20,6 +20,7 @@
 #include "driver/ledc.h"
 //#include "camera_index.h"
 #include "sdkconfig.h"
+#include "app_mdns.h"
 
 #if defined(ARDUINO_ARCH_ESP32) && defined(CONFIG_ARDUHAL_ESP_LOG)
 #include "esp32-hal-log.h"
@@ -705,8 +706,12 @@ static esp_err_t cmd_handler(httpd_req_t *req)
     int res = 0;
 
     if (!strcmp(variable, "framesize")) {
-        if (s->pixformat == PIXFORMAT_JPEG)
+        if (s->pixformat == PIXFORMAT_JPEG) {
             res = s->set_framesize(s, (framesize_t)val);
+            if (res == 0) {
+                app_mdns_update_framesize(val);
+            }
+        }
     }
     else if (!strcmp(variable, "quality"))
         res = s->set_quality(s, val);

examples/single_chip/camera_web_server/main/app_main.c

@@ -23,10 +23,12 @@
 #include "app_camera.h"
 #include "app_wifi.h"
 #include "app_httpd.h"
+#include "app_mdns.h"
 
 void app_main()
 {
     app_wifi_main();
     app_camera_main();
     app_httpd_main();
+    app_mdns_main();
 }

examples/single_chip/camera_web_server/main/app_mdns.c

@@ -0,0 +1,110 @@
+/*
+  * ESPRESSIF MIT License
+  *
+  * Copyright (c) 2020 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
+  *
+  * Permission is hereby granted for use on ESPRESSIF SYSTEMS products only, in which case,
+  * it is free of charge, to any person obtaining a copy of this software and associated
+  * documentation files (the "Software"), to deal in the Software without restriction, including
+  * without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+  * and/or sell copies of the Software, and to permit persons to whom the Software is furnished
+  * to do so, subject to the following conditions:
+  *
+  * The above copyright notice and this permission notice shall be included in all copies or
+  * substantial portions of the Software.
+  *
+  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  *
+  */
+
+#include "sdkconfig.h"
+#include "esp_log.h"
+#include "esp_wifi.h"
+#include "esp_camera.h"
+#include "mdns.h"
+#include "app_camera.h"
+
+static const char *TAG = "camera mdns";
+
+void app_mdns_update_framesize(int size)
+{
+	char framesize[4];
+    snprintf(framesize, 4, "%d", size);
+    if(mdns_service_txt_item_set("_esp-cam", "_tcp", "framesize", (char*)framesize)){
+        ESP_LOGE(TAG, "mdns_service_txt_item_set() framesize Failed");
+    }
+}
+
+void app_mdns_main()
+{
+	char iname[64];
+	char hname[64];
+    uint8_t mac[6];
+	char framesize[4];
+	char pixformat[4];
+
+    if(esp_read_mac(mac, ESP_MAC_WIFI_STA) != ESP_OK){
+        ESP_LOGE(TAG, "esp_read_mac() Failed");
+        return;
+    }
+
+    sensor_t * s = esp_camera_sensor_get();
+    const char * model;
+    switch(s->id.PID){
+        case OV2640_PID: model = "OV2640"; break;
+        case OV3660_PID: model = "OV3660"; break;
+        case OV5640_PID: model = "OV5640"; break;
+        case OV7725_PID: model = "OV7725"; break;
+        default: model = "UNKNOWN"; break;
+    }
+    snprintf(iname, 64, "%s-%s-%02X%02X%02X", CAM_BOARD, model, mac[3], mac[4], mac[5]);
+    snprintf(framesize, 4, "%d", s->status.framesize);
+    snprintf(pixformat, 4, "%d", s->pixformat);
+
+    char * src = iname, * dst = hname, c;
+    while (*src) {
+    	c = *src++;
+    	if (c >= 'A' && c <= 'Z') {
+    		c -= 'A';
+    	}
+    	*dst++ = c;
+    }
+
+    if(mdns_init() != ESP_OK){
+        ESP_LOGE(TAG, "mdns_init() Failed");
+        return;
+    }
+
+    if(mdns_hostname_set(hname) != ESP_OK){
+        ESP_LOGE(TAG, "mdns_hostname_set(\"%s\") Failed", hname);
+        return;
+    }
+
+    if(mdns_instance_name_set(iname) != ESP_OK){
+        ESP_LOGE(TAG, "mdns_instance_name_set(\"%s\") Failed", iname);
+        return;
+    }
+
+    if(mdns_service_add(NULL, "_http", "_tcp", 80, NULL, 0) != ESP_OK){
+        ESP_LOGE(TAG, "mdns_service_add() HTTP Failed");
+        return;
+    }
+
+
+    mdns_txt_item_t camera_txt_data[] = {
+        {(char*)"board"         ,(char*)CAM_BOARD},
+        {(char*)"model"     	,(char*)model},
+        {(char*)"stream_port"   ,(char*)"81"},
+        {(char*)"framesize"   	,(char*)framesize},
+        {(char*)"pixformat"   	,(char*)pixformat}
+    };
+
+    if(mdns_service_add(NULL, "_esp-cam", "_tcp", 80, camera_txt_data, 5)) {
+        ESP_LOGE(TAG, "mdns_service_add() ESP-CAM Failed");
+    }
+}

examples/single_chip/camera_web_server/main/app_wifi.c

@@ -33,6 +33,8 @@
 #include "lwip/err.h"
 #include "lwip/sys.h"
 
+#include "mdns.h"
+
 /* The examples use WiFi configuration that you can set via 'make menuconfig'.
 
    If you'd rather not, just change the below entries to strings with
@@ -83,6 +85,7 @@ static esp_err_t event_handler(void *ctx, system_event_t *event)
     default:
         break;
     }
+    mdns_handle_system_event(ctx, event);
     return ESP_OK;
 }
 

examples/single_chip/camera_web_server/main/include/app_camera.h

@@ -25,6 +25,7 @@
 #define _APP_CAMERA_H_
 
 #if CONFIG_CAMERA_MODEL_WROVER_KIT
+#define CAM_BOARD       "WROVER-KIT"
 #define PWDN_GPIO_NUM    -1
 #define RESET_GPIO_NUM   -1
 #define XCLK_GPIO_NUM    21
@@ -44,6 +45,7 @@
 #define PCLK_GPIO_NUM    22
 
 #elif CONFIG_CAMERA_MODEL_ESP32_CAM_BOARD
+#define CAM_BOARD       "ESP-DEVCAM"
 #define PWDN_GPIO_NUM    32
 #define RESET_GPIO_NUM   33
 #define XCLK_GPIO_NUM     4
@@ -63,6 +65,7 @@
 #define PCLK_GPIO_NUM    25
 
 #elif CONFIG_CAMERA_MODEL_ESP_EYE
+#define CAM_BOARD        "ESP-EYE"
 #define PWDN_GPIO_NUM    -1
 #define RESET_GPIO_NUM   -1
 #define XCLK_GPIO_NUM    4
@@ -82,6 +85,7 @@
 #define PCLK_GPIO_NUM    25
 
 #elif CONFIG_CAMERA_MODEL_M5STACK_PSRAM
+#define CAM_BOARD         "M5CAM"
 #define PWDN_GPIO_NUM     -1
 #define RESET_GPIO_NUM    15
 #define XCLK_GPIO_NUM     27
@@ -101,6 +105,7 @@
 #define PCLK_GPIO_NUM     21
 
 #elif CONFIG_CAMERA_MODEL_M5STACK_WIDE
+#define CAM_BOARD         "M5CAMW"
 #define PWDN_GPIO_NUM     -1
 #define RESET_GPIO_NUM    15
 #define XCLK_GPIO_NUM     27
@@ -120,6 +125,7 @@
 #define PCLK_GPIO_NUM     21
 
 #elif CONFIG_CAMERA_MODEL_AI_THINKER
+#define CAM_BOARD         "AI-THINKER"
 #define PWDN_GPIO_NUM     32
 #define RESET_GPIO_NUM    -1
 #define XCLK_GPIO_NUM      0
@@ -140,6 +146,7 @@
 
 
 #elif CONFIG_CAMERA_MODEL_CUSTOM
+#define CAM_BOARD         "CUSTOM"
 #define PWDN_GPIO_NUM     CONFIG_CAMERA_PIN_PWDN
 #define RESET_GPIO_NUM    CONFIG_CAMERA_PIN_RESET
 #define XCLK_GPIO_NUM     CONFIG_CAMERA_PIN_XCLK

examples/single_chip/camera_web_server/main/include/app_mdns.h

@@ -0,0 +1,28 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef _CAMERA_MDNS_H_
+#define _CAMERA_MDNS_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void app_mdns_main();
+void app_mdns_update_framesize(int size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _CAMERA_MDNS_H_ */