ESP32-CAM视频流

3.ESP32-CAM 简介

ESP32-CAM是一个非常小的摄像头模块，带有ESP32-S芯片，成本不到10美元。您可以阅读 ESP32-CAM 入门指南，了解如何使用视频流和人脸识别示例。

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视频流服务器

按照以下步骤，使用 ESP32-CAM 构建视频流 Web 服务器，您可以在本地网络上访问该服务器。

1. 安装 ESP32 附加组件

在这个例子中，我们使用 Arduino IDE 对 ESP32-CAM 开发板进行编程。因此，您需要安装 Arduino IDE 以及 ESP32 附加组件。请按照以下教程之一安装 ESP32 附加组件（如果尚未安装）：

在 Arduino IDE 中安装 ESP32 开发板（Windows 指令）
在 Arduino IDE 中安装 ESP32 开发板（Mac 和 Linux 说明）

2. 视频流网络服务器代码

之后，将以下代码复制到您的Arduino IDE。

/*********Rui SantosComplete project details at https://RandomNerdTutorials.com/esp32-cam-video-streaming-web-server-camera-home-assistant/IMPORTANT!!! - Select Board "AI Thinker ESP32-CAM"- GPIO 0 must be connected to GND to upload a sketch- After connecting GPIO 0 to GND, press the ESP32-CAM on-board RESET button to put your board in flashing modePermission is hereby granted, free of charge, to any person obtaining a copyof this software and associated documentation files.The above copyright notice and this permission notice shall be included in allcopies or substantial portions of the Software.
*********/#include "esp_camera.h"
#include <WiFi.h>
#include "esp_timer.h"
#include "img_converters.h"
#include "Arduino.h"
#include "fb_gfx.h"
#include "soc/soc.h" //disable brownout problems
#include "soc/rtc_cntl_reg.h"  //disable brownout problems
#include "esp_http_server.h"//Replace with your network credentials
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";#define PART_BOUNDARY "123456789000000000000987654321"// This project was tested with the AI Thinker Model, M5STACK PSRAM Model and M5STACK WITHOUT PSRAM
#define CAMERA_MODEL_AI_THINKER
//#define CAMERA_MODEL_M5STACK_PSRAM
//#define CAMERA_MODEL_M5STACK_WITHOUT_PSRAM// Not tested with this model
//#define CAMERA_MODEL_WROVER_KIT#if defined(CAMERA_MODEL_WROVER_KIT)#define PWDN_GPIO_NUM    -1#define RESET_GPIO_NUM   -1#define XCLK_GPIO_NUM    21#define SIOD_GPIO_NUM    26#define SIOC_GPIO_NUM    27#define Y9_GPIO_NUM      35#define Y8_GPIO_NUM      34#define Y7_GPIO_NUM      39#define Y6_GPIO_NUM      36#define Y5_GPIO_NUM      19#define Y4_GPIO_NUM      18#define Y3_GPIO_NUM       5#define Y2_GPIO_NUM       4#define VSYNC_GPIO_NUM   25#define HREF_GPIO_NUM    23#define PCLK_GPIO_NUM    22#elif defined(CAMERA_MODEL_M5STACK_PSRAM)#define PWDN_GPIO_NUM     -1#define RESET_GPIO_NUM    15#define XCLK_GPIO_NUM     27#define SIOD_GPIO_NUM     25#define SIOC_GPIO_NUM     23#define Y9_GPIO_NUM       19#define Y8_GPIO_NUM       36#define Y7_GPIO_NUM       18#define Y6_GPIO_NUM       39#define Y5_GPIO_NUM        5#define Y4_GPIO_NUM       34#define Y3_GPIO_NUM       35#define Y2_GPIO_NUM       32#define VSYNC_GPIO_NUM    22#define HREF_GPIO_NUM     26#define PCLK_GPIO_NUM     21#elif defined(CAMERA_MODEL_M5STACK_WITHOUT_PSRAM)#define PWDN_GPIO_NUM     -1#define RESET_GPIO_NUM    15#define XCLK_GPIO_NUM     27#define SIOD_GPIO_NUM     25#define SIOC_GPIO_NUM     23#define Y9_GPIO_NUM       19#define Y8_GPIO_NUM       36#define Y7_GPIO_NUM       18#define Y6_GPIO_NUM       39#define Y5_GPIO_NUM        5#define Y4_GPIO_NUM       34#define Y3_GPIO_NUM       35#define Y2_GPIO_NUM       17#define VSYNC_GPIO_NUM    22#define HREF_GPIO_NUM     26#define PCLK_GPIO_NUM     21#elif defined(CAMERA_MODEL_AI_THINKER)#define PWDN_GPIO_NUM     32#define RESET_GPIO_NUM    -1#define XCLK_GPIO_NUM      0#define SIOD_GPIO_NUM     26#define SIOC_GPIO_NUM     27#define Y9_GPIO_NUM       35#define Y8_GPIO_NUM       34#define Y7_GPIO_NUM       39#define Y6_GPIO_NUM       36#define Y5_GPIO_NUM       21#define Y4_GPIO_NUM       19#define Y3_GPIO_NUM       18#define Y2_GPIO_NUM        5#define VSYNC_GPIO_NUM    25#define HREF_GPIO_NUM     23#define PCLK_GPIO_NUM     22
#else#error "Camera model not selected"
#endifstatic const char* _STREAM_CONTENT_TYPE = "multipart/x-mixed-replace;boundary=" PART_BOUNDARY;
static const char* _STREAM_BOUNDARY = "\r\n--" PART_BOUNDARY "\r\n";
static const char* _STREAM_PART = "Content-Type: image/jpeg\r\nContent-Length: %u\r\n\r\n";httpd_handle_t stream_httpd = NULL;static esp_err_t stream_handler(httpd_req_t *req){camera_fb_t * fb = NULL;esp_err_t res = ESP_OK;size_t _jpg_buf_len = 0;uint8_t * _jpg_buf = NULL;char * part_buf[64];res = httpd_resp_set_type(req, _STREAM_CONTENT_TYPE);if(res != ESP_OK){return res;}while(true){fb = esp_camera_fb_get();if (!fb) {Serial.println("Camera capture failed");res = ESP_FAIL;} else {if(fb->width > 400){if(fb->format != PIXFORMAT_JPEG){bool jpeg_converted = frame2jpg(fb, 80, &_jpg_buf, &_jpg_buf_len);esp_camera_fb_return(fb);fb = NULL;if(!jpeg_converted){Serial.println("JPEG compression failed");res = ESP_FAIL;}} else {_jpg_buf_len = fb->len;_jpg_buf = fb->buf;}}}if(res == ESP_OK){size_t hlen = snprintf((char *)part_buf, 64, _STREAM_PART, _jpg_buf_len);res = httpd_resp_send_chunk(req, (const char *)part_buf, hlen);}if(res == ESP_OK){res = httpd_resp_send_chunk(req, (const char *)_jpg_buf, _jpg_buf_len);}if(res == ESP_OK){res = httpd_resp_send_chunk(req, _STREAM_BOUNDARY, strlen(_STREAM_BOUNDARY));}if(fb){esp_camera_fb_return(fb);fb = NULL;_jpg_buf = NULL;} else if(_jpg_buf){free(_jpg_buf);_jpg_buf = NULL;}if(res != ESP_OK){break;}//Serial.printf("MJPG: %uB\n",(uint32_t)(_jpg_buf_len));}return res;
}void startCameraServer(){httpd_config_t config = HTTPD_DEFAULT_CONFIG();config.server_port = 80;httpd_uri_t index_uri = {.uri       = "/",.method    = HTTP_GET,.handler   = stream_handler,.user_ctx  = NULL};//Serial.printf("Starting web server on port: '%d'\n", config.server_port);if (httpd_start(&stream_httpd, &config) == ESP_OK) {httpd_register_uri_handler(stream_httpd, &index_uri);}
}void setup() {WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); //disable brownout detectorSerial.begin(115200);Serial.setDebugOutput(false);camera_config_t config;config.ledc_channel = LEDC_CHANNEL_0;config.ledc_timer = LEDC_TIMER_0;config.pin_d0 = Y2_GPIO_NUM;config.pin_d1 = Y3_GPIO_NUM;config.pin_d2 = Y4_GPIO_NUM;config.pin_d3 = Y5_GPIO_NUM;config.pin_d4 = Y6_GPIO_NUM;config.pin_d5 = Y7_GPIO_NUM;config.pin_d6 = Y8_GPIO_NUM;config.pin_d7 = Y9_GPIO_NUM;config.pin_xclk = XCLK_GPIO_NUM;config.pin_pclk = PCLK_GPIO_NUM;config.pin_vsync = VSYNC_GPIO_NUM;config.pin_href = HREF_GPIO_NUM;config.pin_sscb_sda = SIOD_GPIO_NUM;config.pin_sscb_scl = SIOC_GPIO_NUM;config.pin_pwdn = PWDN_GPIO_NUM;config.pin_reset = RESET_GPIO_NUM;config.xclk_freq_hz = 20000000;config.pixel_format = PIXFORMAT_JPEG; if(psramFound()){config.frame_size = FRAMESIZE_UXGA;config.jpeg_quality = 10;config.fb_count = 2;} else {config.frame_size = FRAMESIZE_SVGA;config.jpeg_quality = 12;config.fb_count = 1;}// Camera initesp_err_t err = esp_camera_init(&config);if (err != ESP_OK) {Serial.printf("Camera init failed with error 0x%x", err);return;}// Wi-Fi connectionWiFi.begin(ssid, password);while (WiFi.status() != WL_CONNECTED) {delay(500);Serial.print(".");}Serial.println("");Serial.println("WiFi connected");Serial.print("Camera Stream Ready! Go to: http://");Serial.print(WiFi.localIP());// Start streaming web serverstartCameraServer();
}void loop() {delay(1);
}

查看原始代码

在上传代码之前，您需要在以下变量中插入您的网络凭据：

const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";

然后，确保选择正确的相机模块。在这种情况下，我们使用的是AI-THINKER模型。

如果您使用相同的相机模块，则无需更改代码上的任何内容。

#define CAMERA_MODEL_AI_THINKER

现在，您可以将代码上传到 ESP32-CAM 开发板。

3. 上传代码

使用 FTDI 编程器将 ESP32-CAM 板连接到计算机。按照下一个逻辑示意图进行操作：

许多FTDI编程器都有一个跳线，允许您选择3.3V或5V。确保跳线位于正确的位置以选择5V。

重要: GPIO 0 要连接 GND 才能上传代码

ESP32-CAM	FTDI Programmer
GND	GND
5V	VCC (5V)
U0R	TX
U0T	RX
GPIO 0	GND

要上传代码，请按照以下步骤操作：

1）转到工具>板，然后选择 AI-Thinker ESP32-CAM。

2）转到**“工具”**>端口"，然后选择 ESP32 连接到的 COM 端口。

3）然后，单击上传按钮以上传代码。

4）当您开始在调试窗口中看到这些点（如下所示）时，请按 ESP32-CAM 板载 RST 按钮。

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几秒钟后，代码应成功上传到您的开发板。

获取 IP 地址

上传代码后，断开连接GPIO 0从加拿大国民民主盾.以波特率为115200打开串行显示器。按 ESP32-CAM 板载复位按钮。

ESP32 IP 地址应打印在串行监视器中。

访问视频流服务器

现在，您可以在本地网络上访问摄像机流服务器。打开浏览器并输入 ESP32-CAM IP 地址。应加载包含当前视频流的页面。

在浏览器中输入IP即可访问